diff options
Diffstat (limited to 'ext/psych')
| -rw-r--r-- | ext/psych/.gitignore | 11 | ||||
| -rw-r--r-- | ext/psych/extconf.rb | 35 | ||||
| -rw-r--r-- | ext/psych/lib/psych.rb | 2 | ||||
| -rw-r--r-- | ext/psych/lib/psych/deprecated.rb | 1 | ||||
| -rw-r--r-- | ext/psych/psych.gemspec | 10 | ||||
| -rw-r--r-- | ext/psych/psych.h | 8 | ||||
| -rw-r--r-- | ext/psych/psych_emitter.c (renamed from ext/psych/emitter.c) | 0 | ||||
| -rw-r--r-- | ext/psych/psych_emitter.h (renamed from ext/psych/emitter.h) | 0 | ||||
| -rw-r--r-- | ext/psych/psych_parser.c (renamed from ext/psych/parser.c) | 0 | ||||
| -rw-r--r-- | ext/psych/psych_parser.h (renamed from ext/psych/parser.h) | 0 | ||||
| -rw-r--r-- | ext/psych/psych_to_ruby.c (renamed from ext/psych/to_ruby.c) | 0 | ||||
| -rw-r--r-- | ext/psych/psych_to_ruby.h (renamed from ext/psych/to_ruby.h) | 0 | ||||
| -rw-r--r-- | ext/psych/psych_yaml_tree.c (renamed from ext/psych/yaml_tree.c) | 0 | ||||
| -rw-r--r-- | ext/psych/psych_yaml_tree.h (renamed from ext/psych/yaml_tree.h) | 0 | ||||
| -rw-r--r-- | ext/psych/yaml/LICENSE | 19 | ||||
| -rw-r--r-- | ext/psych/yaml/api.c | 1392 | ||||
| -rw-r--r-- | ext/psych/yaml/config.h | 11 | ||||
| -rw-r--r-- | ext/psych/yaml/dumper.c | 394 | ||||
| -rw-r--r-- | ext/psych/yaml/emitter.c | 2329 | ||||
| -rw-r--r-- | ext/psych/yaml/loader.c | 432 | ||||
| -rw-r--r-- | ext/psych/yaml/parser.c | 1374 | ||||
| -rw-r--r-- | ext/psych/yaml/reader.c | 465 | ||||
| -rw-r--r-- | ext/psych/yaml/scanner.c | 3570 | ||||
| -rw-r--r-- | ext/psych/yaml/writer.c | 141 | ||||
| -rw-r--r-- | ext/psych/yaml/yaml.h | 1971 | ||||
| -rw-r--r-- | ext/psych/yaml/yaml_private.h | 643 |
26 files changed, 12793 insertions, 15 deletions
diff --git a/ext/psych/.gitignore b/ext/psych/.gitignore new file mode 100644 index 0000000000..836058c169 --- /dev/null +++ b/ext/psych/.gitignore @@ -0,0 +1,11 @@ +/api.c +/config.h +/dumper.c +/emitter.c +/loader.c +/parser.c +/reader.c +/scanner.c +/writer.c +/yaml.h +/yaml_private.h diff --git a/ext/psych/extconf.rb b/ext/psych/extconf.rb index ccc8c9c304..b294aabcff 100644 --- a/ext/psych/extconf.rb +++ b/ext/psych/extconf.rb @@ -1,15 +1,40 @@ require 'mkmf' +require 'fileutils' # :stopdoc: dir_config 'libyaml' -def asplode missing - raise "#{missing} is missing. Please install libyaml." -end +unless find_header('yaml.h') && find_library('yaml', 'yaml_get_version') + # Embed libyaml since we could not find it. + + srcdir = File.expand_path File.dirname __FILE__ + files = Dir.chdir File.join(srcdir, 'yaml') do + Dir.entries(Dir.pwd).find_all { |f| + File.file?(f) && File.extname(f) =~ /^\.[hc]/ + }.map { |f| File.expand_path f } + end + + FileUtils.cp_r files, srcdir -asplode('yaml.h') unless find_header 'yaml.h' -asplode('libyaml') unless find_library 'yaml', 'yaml_get_version' + if $mswin + $CFLAGS += " -DYAML_DECLARE_STATIC -DHAVE_CONFIG_H" + end + + have_header 'dlfcn.h' + have_header 'inttypes.h' + have_header 'memory.h' + have_header 'stdint.h' + have_header 'stdlib.h' + have_header 'strings.h' + have_header 'string.h' + have_header 'sys/stat.h' + have_header 'sys/types.h' + have_header 'unistd.h' + + find_header 'yaml.h' + have_header 'config.h' +end create_makefile 'psych' diff --git a/ext/psych/lib/psych.rb b/ext/psych/lib/psych.rb index ccbc7fe740..d4a5171905 100644 --- a/ext/psych/lib/psych.rb +++ b/ext/psych/lib/psych.rb @@ -95,7 +95,7 @@ require 'psych/handlers/document_stream' module Psych # The version is Psych you're using - VERSION = '1.3.4' + VERSION = '2.0.0' # The version of libyaml Psych is using LIBYAML_VERSION = Psych.libyaml_version.join '.' diff --git a/ext/psych/lib/psych/deprecated.rb b/ext/psych/lib/psych/deprecated.rb index 333c3a1016..1e42859b22 100644 --- a/ext/psych/lib/psych/deprecated.rb +++ b/ext/psych/lib/psych/deprecated.rb @@ -21,6 +21,7 @@ module Psych target.psych_to_yaml unless opts[:nodump] end + # This method is deprecated, use Psych.load_stream instead. def self.load_documents yaml, &block if $VERBOSE warn "#{caller[0]}: load_documents is deprecated, use load_stream" diff --git a/ext/psych/psych.gemspec b/ext/psych/psych.gemspec index 7ae580ca5b..c15449c6ae 100644 --- a/ext/psych/psych.gemspec +++ b/ext/psych/psych.gemspec @@ -2,23 +2,23 @@ Gem::Specification.new do |s| s.name = "psych" - s.version = "1.3.4" + s.version = "2.0.0" s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version= s.authors = ["Aaron Patterson"] - s.date = "2012-07-31" + s.date = "2012-11-28" s.description = "Psych is a YAML parser and emitter. Psych leverages libyaml[http://pyyaml.org/wiki/LibYAML]\nfor its YAML parsing and emitting capabilities. In addition to wrapping\nlibyaml, Psych also knows how to serialize and de-serialize most Ruby objects\nto and from the YAML format." s.email = ["aaron@tenderlovemaking.com"] s.extensions = ["ext/psych/extconf.rb"] s.extra_rdoc_files = ["CHANGELOG.rdoc", "Manifest.txt", "README.rdoc"] - s.files = [".autotest", ".travis.yml", "CHANGELOG.rdoc", "Manifest.txt", "README.rdoc", "Rakefile", "ext/psych/emitter.c", "ext/psych/emitter.h", "ext/psych/extconf.rb", "ext/psych/parser.c", "ext/psych/parser.h", "ext/psych/psych.c", "ext/psych/psych.h", "ext/psych/to_ruby.c", "ext/psych/to_ruby.h", "ext/psych/yaml_tree.c", "ext/psych/yaml_tree.h", "lib/psych.rb", "lib/psych/coder.rb", "lib/psych/core_ext.rb", "lib/psych/deprecated.rb", "lib/psych/handler.rb", "lib/psych/handlers/document_stream.rb", "lib/psych/json/ruby_events.rb", "lib/psych/json/stream.rb", "lib/psych/json/tree_builder.rb", "lib/psych/json/yaml_events.rb", "lib/psych/nodes.rb", "lib/psych/nodes/alias.rb", "lib/psych/nodes/document.rb", "lib/psych/nodes/mapping.rb", "lib/psych/nodes/node.rb", "lib/psych/nodes/scalar.rb", "lib/psych/nodes/sequence.rb", "lib/psych/nodes/stream.rb", "lib/psych/omap.rb", "lib/psych/parser.rb", "lib/psych/scalar_scanner.rb", "lib/psych/set.rb", "lib/psych/stream.rb", "lib/psych/streaming.rb", "lib/psych/syntax_error.rb", "lib/psych/tree_builder.rb", "lib/psych/visitors.rb", "lib/psych/visitors/depth_first.rb", "lib/psych/visitors/emitter.rb", "lib/psych/visitors/json_tree.rb", "lib/psych/visitors/to_ruby.rb", "lib/psych/visitors/visitor.rb", "lib/psych/visitors/yaml_tree.rb", "test/psych/helper.rb", "test/psych/json/test_stream.rb", "test/psych/nodes/test_enumerable.rb", "test/psych/test_alias_and_anchor.rb", "test/psych/test_array.rb", "test/psych/test_boolean.rb", "test/psych/test_class.rb", "test/psych/test_coder.rb", "test/psych/test_date_time.rb", "test/psych/test_deprecated.rb", "test/psych/test_document.rb", "test/psych/test_emitter.rb", "test/psych/test_encoding.rb", "test/psych/test_engine_manager.rb", "test/psych/test_exception.rb", "test/psych/test_hash.rb", "test/psych/test_json_tree.rb", "test/psych/test_merge_keys.rb", "test/psych/test_nil.rb", "test/psych/test_null.rb", "test/psych/test_numeric.rb", "test/psych/test_object.rb", "test/psych/test_object_references.rb", "test/psych/test_omap.rb", "test/psych/test_parser.rb", "test/psych/test_psych.rb", "test/psych/test_scalar.rb", "test/psych/test_scalar_scanner.rb", "test/psych/test_serialize_subclasses.rb", "test/psych/test_set.rb", "test/psych/test_stream.rb", "test/psych/test_string.rb", "test/psych/test_struct.rb", "test/psych/test_symbol.rb", "test/psych/test_tainted.rb", "test/psych/test_to_yaml_properties.rb", "test/psych/test_tree_builder.rb", "test/psych/test_yaml.rb", "test/psych/test_yamldbm.rb", "test/psych/test_yamlstore.rb", "test/psych/visitors/test_depth_first.rb", "test/psych/visitors/test_emitter.rb", "test/psych/visitors/test_to_ruby.rb", "test/psych/visitors/test_yaml_tree.rb", ".gemtest"] + s.files = [".autotest", ".travis.yml", "CHANGELOG.rdoc", "Manifest.txt", "README.rdoc", "Rakefile", "ext/psych/extconf.rb", "ext/psych/psych.c", "ext/psych/psych.h", "ext/psych/psych_emitter.c", "ext/psych/psych_emitter.h", "ext/psych/psych_parser.c", "ext/psych/psych_parser.h", "ext/psych/psych_to_ruby.c", "ext/psych/psych_to_ruby.h", "ext/psych/psych_yaml_tree.c", "ext/psych/psych_yaml_tree.h", "ext/psych/yaml/LICENSE", "ext/psych/yaml/api.c", "ext/psych/yaml/config.h", "ext/psych/yaml/dumper.c", "ext/psych/yaml/emitter.c", "ext/psych/yaml/loader.c", "ext/psych/yaml/parser.c", "ext/psych/yaml/reader.c", "ext/psych/yaml/scanner.c", "ext/psych/yaml/writer.c", "ext/psych/yaml/yaml.h", "ext/psych/yaml/yaml_private.h", "lib/psych.rb", "lib/psych/coder.rb", "lib/psych/core_ext.rb", "lib/psych/deprecated.rb", "lib/psych/handler.rb", "lib/psych/handlers/document_stream.rb", "lib/psych/handlers/recorder.rb", "lib/psych/json/ruby_events.rb", "lib/psych/json/stream.rb", "lib/psych/json/tree_builder.rb", "lib/psych/json/yaml_events.rb", "lib/psych/nodes.rb", "lib/psych/nodes/alias.rb", "lib/psych/nodes/document.rb", "lib/psych/nodes/mapping.rb", "lib/psych/nodes/node.rb", "lib/psych/nodes/scalar.rb", "lib/psych/nodes/sequence.rb", "lib/psych/nodes/stream.rb", "lib/psych/omap.rb", "lib/psych/parser.rb", "lib/psych/scalar_scanner.rb", "lib/psych/set.rb", "lib/psych/stream.rb", "lib/psych/streaming.rb", "lib/psych/syntax_error.rb", "lib/psych/tree_builder.rb", "lib/psych/visitors.rb", "lib/psych/visitors/depth_first.rb", "lib/psych/visitors/emitter.rb", "lib/psych/visitors/json_tree.rb", "lib/psych/visitors/to_ruby.rb", "lib/psych/visitors/visitor.rb", "lib/psych/visitors/yaml_tree.rb", "lib/psych/y.rb", "test/psych/handlers/test_recorder.rb", "test/psych/helper.rb", "test/psych/json/test_stream.rb", "test/psych/nodes/test_enumerable.rb", "test/psych/test_alias_and_anchor.rb", "test/psych/test_array.rb", "test/psych/test_boolean.rb", "test/psych/test_class.rb", "test/psych/test_coder.rb", "test/psych/test_date_time.rb", "test/psych/test_deprecated.rb", "test/psych/test_document.rb", "test/psych/test_emitter.rb", "test/psych/test_encoding.rb", "test/psych/test_engine_manager.rb", "test/psych/test_exception.rb", "test/psych/test_hash.rb", "test/psych/test_json_tree.rb", "test/psych/test_merge_keys.rb", "test/psych/test_nil.rb", "test/psych/test_null.rb", "test/psych/test_numeric.rb", "test/psych/test_object.rb", "test/psych/test_object_references.rb", "test/psych/test_omap.rb", "test/psych/test_parser.rb", "test/psych/test_psych.rb", "test/psych/test_scalar.rb", "test/psych/test_scalar_scanner.rb", "test/psych/test_serialize_subclasses.rb", "test/psych/test_set.rb", "test/psych/test_stream.rb", "test/psych/test_string.rb", "test/psych/test_struct.rb", "test/psych/test_symbol.rb", "test/psych/test_tainted.rb", "test/psych/test_to_yaml_properties.rb", "test/psych/test_tree_builder.rb", "test/psych/test_yaml.rb", "test/psych/test_yamldbm.rb", "test/psych/test_yamlstore.rb", "test/psych/visitors/test_depth_first.rb", "test/psych/visitors/test_emitter.rb", "test/psych/visitors/test_to_ruby.rb", "test/psych/visitors/test_yaml_tree.rb", ".gemtest"] s.homepage = "http://github.com/tenderlove/psych" s.rdoc_options = ["--main", "README.rdoc"] s.require_paths = ["lib"] s.required_ruby_version = Gem::Requirement.new(">= 1.9.2") s.rubyforge_project = "psych" - s.rubygems_version = "1.8.23" + s.rubygems_version = "1.8.24" s.summary = "Psych is a YAML parser and emitter" - s.test_files = ["test/psych/json/test_stream.rb", "test/psych/nodes/test_enumerable.rb", "test/psych/test_alias_and_anchor.rb", "test/psych/test_array.rb", "test/psych/test_boolean.rb", "test/psych/test_class.rb", "test/psych/test_coder.rb", "test/psych/test_date_time.rb", "test/psych/test_deprecated.rb", "test/psych/test_document.rb", "test/psych/test_emitter.rb", "test/psych/test_encoding.rb", "test/psych/test_engine_manager.rb", "test/psych/test_exception.rb", "test/psych/test_hash.rb", "test/psych/test_json_tree.rb", "test/psych/test_merge_keys.rb", "test/psych/test_nil.rb", "test/psych/test_null.rb", "test/psych/test_numeric.rb", "test/psych/test_object.rb", "test/psych/test_object_references.rb", "test/psych/test_omap.rb", "test/psych/test_parser.rb", "test/psych/test_psych.rb", "test/psych/test_scalar.rb", "test/psych/test_scalar_scanner.rb", "test/psych/test_serialize_subclasses.rb", "test/psych/test_set.rb", "test/psych/test_stream.rb", "test/psych/test_string.rb", "test/psych/test_struct.rb", "test/psych/test_symbol.rb", "test/psych/test_tainted.rb", "test/psych/test_to_yaml_properties.rb", "test/psych/test_tree_builder.rb", "test/psych/test_yaml.rb", "test/psych/test_yamldbm.rb", "test/psych/test_yamlstore.rb", "test/psych/visitors/test_depth_first.rb", "test/psych/visitors/test_emitter.rb", "test/psych/visitors/test_to_ruby.rb", "test/psych/visitors/test_yaml_tree.rb"] + s.test_files = ["test/psych/handlers/test_recorder.rb", "test/psych/json/test_stream.rb", "test/psych/nodes/test_enumerable.rb", "test/psych/test_alias_and_anchor.rb", "test/psych/test_array.rb", "test/psych/test_boolean.rb", "test/psych/test_class.rb", "test/psych/test_coder.rb", "test/psych/test_date_time.rb", "test/psych/test_deprecated.rb", "test/psych/test_document.rb", "test/psych/test_emitter.rb", "test/psych/test_encoding.rb", "test/psych/test_engine_manager.rb", "test/psych/test_exception.rb", "test/psych/test_hash.rb", "test/psych/test_json_tree.rb", "test/psych/test_merge_keys.rb", "test/psych/test_nil.rb", "test/psych/test_null.rb", "test/psych/test_numeric.rb", "test/psych/test_object.rb", "test/psych/test_object_references.rb", "test/psych/test_omap.rb", "test/psych/test_parser.rb", "test/psych/test_psych.rb", "test/psych/test_scalar.rb", "test/psych/test_scalar_scanner.rb", "test/psych/test_serialize_subclasses.rb", "test/psych/test_set.rb", "test/psych/test_stream.rb", "test/psych/test_string.rb", "test/psych/test_struct.rb", "test/psych/test_symbol.rb", "test/psych/test_tainted.rb", "test/psych/test_to_yaml_properties.rb", "test/psych/test_tree_builder.rb", "test/psych/test_yaml.rb", "test/psych/test_yamldbm.rb", "test/psych/test_yamlstore.rb", "test/psych/visitors/test_depth_first.rb", "test/psych/visitors/test_emitter.rb", "test/psych/visitors/test_to_ruby.rb", "test/psych/visitors/test_yaml_tree.rb"] end diff --git a/ext/psych/psych.h b/ext/psych/psych.h index 9f1be449a2..1830ca4b19 100644 --- a/ext/psych/psych.h +++ b/ext/psych/psych.h @@ -9,10 +9,10 @@ #include <yaml.h> -#include <parser.h> -#include <emitter.h> -#include <to_ruby.h> -#include <yaml_tree.h> +#include <psych_parser.h> +#include <psych_emitter.h> +#include <psych_to_ruby.h> +#include <psych_yaml_tree.h> extern VALUE mPsych; diff --git a/ext/psych/emitter.c b/ext/psych/psych_emitter.c index f0d032649c..f0d032649c 100644 --- a/ext/psych/emitter.c +++ b/ext/psych/psych_emitter.c diff --git a/ext/psych/emitter.h b/ext/psych/psych_emitter.h index 560451ef31..560451ef31 100644 --- a/ext/psych/emitter.h +++ b/ext/psych/psych_emitter.h diff --git a/ext/psych/parser.c b/ext/psych/psych_parser.c index 8c65ce1307..8c65ce1307 100644 --- a/ext/psych/parser.c +++ b/ext/psych/psych_parser.c diff --git a/ext/psych/parser.h b/ext/psych/psych_parser.h index 25e896f01d..25e896f01d 100644 --- a/ext/psych/parser.h +++ b/ext/psych/psych_parser.h diff --git a/ext/psych/to_ruby.c b/ext/psych/psych_to_ruby.c index ed5245e12e..ed5245e12e 100644 --- a/ext/psych/to_ruby.c +++ b/ext/psych/psych_to_ruby.c diff --git a/ext/psych/to_ruby.h b/ext/psych/psych_to_ruby.h index 7b8e757a45..7b8e757a45 100644 --- a/ext/psych/to_ruby.h +++ b/ext/psych/psych_to_ruby.h diff --git a/ext/psych/yaml_tree.c b/ext/psych/psych_yaml_tree.c index bcf24d2070..bcf24d2070 100644 --- a/ext/psych/yaml_tree.c +++ b/ext/psych/psych_yaml_tree.c diff --git a/ext/psych/yaml_tree.h b/ext/psych/psych_yaml_tree.h index 4628a69d71..4628a69d71 100644 --- a/ext/psych/yaml_tree.h +++ b/ext/psych/psych_yaml_tree.h diff --git a/ext/psych/yaml/LICENSE b/ext/psych/yaml/LICENSE new file mode 100644 index 0000000000..050ced23f6 --- /dev/null +++ b/ext/psych/yaml/LICENSE @@ -0,0 +1,19 @@ +Copyright (c) 2006 Kirill Simonov + +Permission is hereby granted, free of charge, to any person obtaining a copy of +this software and associated documentation files (the "Software"), to deal in +the Software without restriction, including without limitation the rights to +use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies +of the Software, and to permit persons to whom the Software is furnished to do +so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/ext/psych/yaml/api.c b/ext/psych/yaml/api.c new file mode 100644 index 0000000000..0c4732e152 --- /dev/null +++ b/ext/psych/yaml/api.c @@ -0,0 +1,1392 @@ + +#include "yaml_private.h" + +/* + * Get the library version. + */ + +YAML_DECLARE(const char *) +yaml_get_version_string(void) +{ + return YAML_VERSION_STRING; +} + +/* + * Get the library version numbers. + */ + +YAML_DECLARE(void) +yaml_get_version(int *major, int *minor, int *patch) +{ + *major = YAML_VERSION_MAJOR; + *minor = YAML_VERSION_MINOR; + *patch = YAML_VERSION_PATCH; +} + +/* + * Allocate a dynamic memory block. + */ + +YAML_DECLARE(void *) +yaml_malloc(size_t size) +{ + return malloc(size ? size : 1); +} + +/* + * Reallocate a dynamic memory block. + */ + +YAML_DECLARE(void *) +yaml_realloc(void *ptr, size_t size) +{ + return ptr ? realloc(ptr, size ? size : 1) : malloc(size ? size : 1); +} + +/* + * Free a dynamic memory block. + */ + +YAML_DECLARE(void) +yaml_free(void *ptr) +{ + if (ptr) free(ptr); +} + +/* + * Duplicate a string. + */ + +YAML_DECLARE(yaml_char_t *) +yaml_strdup(const yaml_char_t *str) +{ + if (!str) + return NULL; + + return (yaml_char_t *)strdup((char *)str); +} + +/* + * Extend a string. + */ + +YAML_DECLARE(int) +yaml_string_extend(yaml_char_t **start, + yaml_char_t **pointer, yaml_char_t **end) +{ + yaml_char_t *new_start = yaml_realloc(*start, (*end - *start)*2); + + if (!new_start) return 0; + + memset(new_start + (*end - *start), 0, *end - *start); + + *pointer = new_start + (*pointer - *start); + *end = new_start + (*end - *start)*2; + *start = new_start; + + return 1; +} + +/* + * Append a string B to a string A. + */ + +YAML_DECLARE(int) +yaml_string_join( + yaml_char_t **a_start, yaml_char_t **a_pointer, yaml_char_t **a_end, + yaml_char_t **b_start, yaml_char_t **b_pointer, yaml_char_t **b_end) +{ + if (*b_start == *b_pointer) + return 1; + + while (*a_end - *a_pointer <= *b_pointer - *b_start) { + if (!yaml_string_extend(a_start, a_pointer, a_end)) + return 0; + } + + memcpy(*a_pointer, *b_start, *b_pointer - *b_start); + *a_pointer += *b_pointer - *b_start; + + return 1; +} + +/* + * Extend a stack. + */ + +YAML_DECLARE(int) +yaml_stack_extend(void **start, void **top, void **end) +{ + void *new_start = yaml_realloc(*start, ((char *)*end - (char *)*start)*2); + + if (!new_start) return 0; + + *top = (char *)new_start + ((char *)*top - (char *)*start); + *end = (char *)new_start + ((char *)*end - (char *)*start)*2; + *start = new_start; + + return 1; +} + +/* + * Extend or move a queue. + */ + +YAML_DECLARE(int) +yaml_queue_extend(void **start, void **head, void **tail, void **end) +{ + /* Check if we need to resize the queue. */ + + if (*start == *head && *tail == *end) { + void *new_start = yaml_realloc(*start, + ((char *)*end - (char *)*start)*2); + + if (!new_start) return 0; + + *head = (char *)new_start + ((char *)*head - (char *)*start); + *tail = (char *)new_start + ((char *)*tail - (char *)*start); + *end = (char *)new_start + ((char *)*end - (char *)*start)*2; + *start = new_start; + } + + /* Check if we need to move the queue at the beginning of the buffer. */ + + if (*tail == *end) { + if (*head != *tail) { + memmove(*start, *head, (char *)*tail - (char *)*head); + } + *tail = (char *)*tail - (char *)*head + (char *)*start; + *head = *start; + } + + return 1; +} + + +/* + * Create a new parser object. + */ + +YAML_DECLARE(int) +yaml_parser_initialize(yaml_parser_t *parser) +{ + assert(parser); /* Non-NULL parser object expected. */ + + memset(parser, 0, sizeof(yaml_parser_t)); + if (!BUFFER_INIT(parser, parser->raw_buffer, INPUT_RAW_BUFFER_SIZE)) + goto error; + if (!BUFFER_INIT(parser, parser->buffer, INPUT_BUFFER_SIZE)) + goto error; + if (!QUEUE_INIT(parser, parser->tokens, INITIAL_QUEUE_SIZE)) + goto error; + if (!STACK_INIT(parser, parser->indents, INITIAL_STACK_SIZE)) + goto error; + if (!STACK_INIT(parser, parser->simple_keys, INITIAL_STACK_SIZE)) + goto error; + if (!STACK_INIT(parser, parser->states, INITIAL_STACK_SIZE)) + goto error; + if (!STACK_INIT(parser, parser->marks, INITIAL_STACK_SIZE)) + goto error; + if (!STACK_INIT(parser, parser->tag_directives, INITIAL_STACK_SIZE)) + goto error; + + return 1; + +error: + + BUFFER_DEL(parser, parser->raw_buffer); + BUFFER_DEL(parser, parser->buffer); + QUEUE_DEL(parser, parser->tokens); + STACK_DEL(parser, parser->indents); + STACK_DEL(parser, parser->simple_keys); + STACK_DEL(parser, parser->states); + STACK_DEL(parser, parser->marks); + STACK_DEL(parser, parser->tag_directives); + + return 0; +} + +/* + * Destroy a parser object. + */ + +YAML_DECLARE(void) +yaml_parser_delete(yaml_parser_t *parser) +{ + assert(parser); /* Non-NULL parser object expected. */ + + BUFFER_DEL(parser, parser->raw_buffer); + BUFFER_DEL(parser, parser->buffer); + while (!QUEUE_EMPTY(parser, parser->tokens)) { + yaml_token_delete(&DEQUEUE(parser, parser->tokens)); + } + QUEUE_DEL(parser, parser->tokens); + STACK_DEL(parser, parser->indents); + STACK_DEL(parser, parser->simple_keys); + STACK_DEL(parser, parser->states); + STACK_DEL(parser, parser->marks); + while (!STACK_EMPTY(parser, parser->tag_directives)) { + yaml_tag_directive_t tag_directive = POP(parser, parser->tag_directives); + yaml_free(tag_directive.handle); + yaml_free(tag_directive.prefix); + } + STACK_DEL(parser, parser->tag_directives); + + memset(parser, 0, sizeof(yaml_parser_t)); +} + +/* + * String read handler. + */ + +static int +yaml_string_read_handler(void *data, unsigned char *buffer, size_t size, + size_t *size_read) +{ + yaml_parser_t *parser = data; + + if (parser->input.string.current == parser->input.string.end) { + *size_read = 0; + return 1; + } + + if (size > (size_t)(parser->input.string.end + - parser->input.string.current)) { + size = parser->input.string.end - parser->input.string.current; + } + + memcpy(buffer, parser->input.string.current, size); + parser->input.string.current += size; + *size_read = size; + return 1; +} + +/* + * File read handler. + */ + +static int +yaml_file_read_handler(void *data, unsigned char *buffer, size_t size, + size_t *size_read) +{ + yaml_parser_t *parser = data; + + *size_read = fread(buffer, 1, size, parser->input.file); + return !ferror(parser->input.file); +} + +/* + * Set a string input. + */ + +YAML_DECLARE(void) +yaml_parser_set_input_string(yaml_parser_t *parser, + const unsigned char *input, size_t size) +{ + assert(parser); /* Non-NULL parser object expected. */ + assert(!parser->read_handler); /* You can set the source only once. */ + assert(input); /* Non-NULL input string expected. */ + + parser->read_handler = yaml_string_read_handler; + parser->read_handler_data = parser; + + parser->input.string.start = input; + parser->input.string.current = input; + parser->input.string.end = input+size; +} + +/* + * Set a file input. + */ + +YAML_DECLARE(void) +yaml_parser_set_input_file(yaml_parser_t *parser, FILE *file) +{ + assert(parser); /* Non-NULL parser object expected. */ + assert(!parser->read_handler); /* You can set the source only once. */ + assert(file); /* Non-NULL file object expected. */ + + parser->read_handler = yaml_file_read_handler; + parser->read_handler_data = parser; + + parser->input.file = file; +} + +/* + * Set a generic input. + */ + +YAML_DECLARE(void) +yaml_parser_set_input(yaml_parser_t *parser, + yaml_read_handler_t *handler, void *data) +{ + assert(parser); /* Non-NULL parser object expected. */ + assert(!parser->read_handler); /* You can set the source only once. */ + assert(handler); /* Non-NULL read handler expected. */ + + parser->read_handler = handler; + parser->read_handler_data = data; +} + +/* + * Set the source encoding. + */ + +YAML_DECLARE(void) +yaml_parser_set_encoding(yaml_parser_t *parser, yaml_encoding_t encoding) +{ + assert(parser); /* Non-NULL parser object expected. */ + assert(!parser->encoding); /* Encoding is already set or detected. */ + + parser->encoding = encoding; +} + +/* + * Create a new emitter object. + */ + +YAML_DECLARE(int) +yaml_emitter_initialize(yaml_emitter_t *emitter) +{ + assert(emitter); /* Non-NULL emitter object expected. */ + + memset(emitter, 0, sizeof(yaml_emitter_t)); + if (!BUFFER_INIT(emitter, emitter->buffer, OUTPUT_BUFFER_SIZE)) + goto error; + if (!BUFFER_INIT(emitter, emitter->raw_buffer, OUTPUT_RAW_BUFFER_SIZE)) + goto error; + if (!STACK_INIT(emitter, emitter->states, INITIAL_STACK_SIZE)) + goto error; + if (!QUEUE_INIT(emitter, emitter->events, INITIAL_QUEUE_SIZE)) + goto error; + if (!STACK_INIT(emitter, emitter->indents, INITIAL_STACK_SIZE)) + goto error; + if (!STACK_INIT(emitter, emitter->tag_directives, INITIAL_STACK_SIZE)) + goto error; + + return 1; + +error: + + BUFFER_DEL(emitter, emitter->buffer); + BUFFER_DEL(emitter, emitter->raw_buffer); + STACK_DEL(emitter, emitter->states); + QUEUE_DEL(emitter, emitter->events); + STACK_DEL(emitter, emitter->indents); + STACK_DEL(emitter, emitter->tag_directives); + + return 0; +} + +/* + * Destroy an emitter object. + */ + +YAML_DECLARE(void) +yaml_emitter_delete(yaml_emitter_t *emitter) +{ + assert(emitter); /* Non-NULL emitter object expected. */ + + BUFFER_DEL(emitter, emitter->buffer); + BUFFER_DEL(emitter, emitter->raw_buffer); + STACK_DEL(emitter, emitter->states); + while (!QUEUE_EMPTY(emitter, emitter->events)) { + yaml_event_delete(&DEQUEUE(emitter, emitter->events)); + } + QUEUE_DEL(emitter, emitter->events); + STACK_DEL(emitter, emitter->indents); + while (!STACK_EMPTY(empty, emitter->tag_directives)) { + yaml_tag_directive_t tag_directive = POP(emitter, emitter->tag_directives); + yaml_free(tag_directive.handle); + yaml_free(tag_directive.prefix); + } + STACK_DEL(emitter, emitter->tag_directives); + yaml_free(emitter->anchors); + + memset(emitter, 0, sizeof(yaml_emitter_t)); +} + +/* + * String write handler. + */ + +static int +yaml_string_write_handler(void *data, unsigned char *buffer, size_t size) +{ + yaml_emitter_t *emitter = data; + + if (emitter->output.string.size + *emitter->output.string.size_written + < size) { + memcpy(emitter->output.string.buffer + + *emitter->output.string.size_written, + buffer, + emitter->output.string.size + - *emitter->output.string.size_written); + *emitter->output.string.size_written = emitter->output.string.size; + return 0; + } + + memcpy(emitter->output.string.buffer + + *emitter->output.string.size_written, buffer, size); + *emitter->output.string.size_written += size; + return 1; +} + +/* + * File write handler. + */ + +static int +yaml_file_write_handler(void *data, unsigned char *buffer, size_t size) +{ + yaml_emitter_t *emitter = data; + + return (fwrite(buffer, 1, size, emitter->output.file) == size); +} +/* + * Set a string output. + */ + +YAML_DECLARE(void) +yaml_emitter_set_output_string(yaml_emitter_t *emitter, + unsigned char *output, size_t size, size_t *size_written) +{ + assert(emitter); /* Non-NULL emitter object expected. */ + assert(!emitter->write_handler); /* You can set the output only once. */ + assert(output); /* Non-NULL output string expected. */ + + emitter->write_handler = yaml_string_write_handler; + emitter->write_handler_data = emitter; + + emitter->output.string.buffer = output; + emitter->output.string.size = size; + emitter->output.string.size_written = size_written; + *size_written = 0; +} + +/* + * Set a file output. + */ + +YAML_DECLARE(void) +yaml_emitter_set_output_file(yaml_emitter_t *emitter, FILE *file) +{ + assert(emitter); /* Non-NULL emitter object expected. */ + assert(!emitter->write_handler); /* You can set the output only once. */ + assert(file); /* Non-NULL file object expected. */ + + emitter->write_handler = yaml_file_write_handler; + emitter->write_handler_data = emitter; + + emitter->output.file = file; +} + +/* + * Set a generic output handler. + */ + +YAML_DECLARE(void) +yaml_emitter_set_output(yaml_emitter_t *emitter, + yaml_write_handler_t *handler, void *data) +{ + assert(emitter); /* Non-NULL emitter object expected. */ + assert(!emitter->write_handler); /* You can set the output only once. */ + assert(handler); /* Non-NULL handler object expected. */ + + emitter->write_handler = handler; + emitter->write_handler_data = data; +} + +/* + * Set the output encoding. + */ + +YAML_DECLARE(void) +yaml_emitter_set_encoding(yaml_emitter_t *emitter, yaml_encoding_t encoding) +{ + assert(emitter); /* Non-NULL emitter object expected. */ + assert(!emitter->encoding); /* You can set encoding only once. */ + + emitter->encoding = encoding; +} + +/* + * Set the canonical output style. + */ + +YAML_DECLARE(void) +yaml_emitter_set_canonical(yaml_emitter_t *emitter, int canonical) +{ + assert(emitter); /* Non-NULL emitter object expected. */ + + emitter->canonical = (canonical != 0); +} + +/* + * Set the indentation increment. + */ + +YAML_DECLARE(void) +yaml_emitter_set_indent(yaml_emitter_t *emitter, int indent) +{ + assert(emitter); /* Non-NULL emitter object expected. */ + + emitter->best_indent = (1 < indent && indent < 10) ? indent : 2; +} + +/* + * Set the preferred line width. + */ + +YAML_DECLARE(void) +yaml_emitter_set_width(yaml_emitter_t *emitter, int width) +{ + assert(emitter); /* Non-NULL emitter object expected. */ + + emitter->best_width = (width >= 0) ? width : -1; +} + +/* + * Set if unescaped non-ASCII characters are allowed. + */ + +YAML_DECLARE(void) +yaml_emitter_set_unicode(yaml_emitter_t *emitter, int unicode) +{ + assert(emitter); /* Non-NULL emitter object expected. */ + + emitter->unicode = (unicode != 0); +} + +/* + * Set the preferred line break character. + */ + +YAML_DECLARE(void) +yaml_emitter_set_break(yaml_emitter_t *emitter, yaml_break_t line_break) +{ + assert(emitter); /* Non-NULL emitter object expected. */ + + emitter->line_break = line_break; +} + +/* + * Destroy a token object. + */ + +YAML_DECLARE(void) +yaml_token_delete(yaml_token_t *token) +{ + assert(token); /* Non-NULL token object expected. */ + + switch (token->type) + { + case YAML_TAG_DIRECTIVE_TOKEN: + yaml_free(token->data.tag_directive.handle); + yaml_free(token->data.tag_directive.prefix); + break; + + case YAML_ALIAS_TOKEN: + yaml_free(token->data.alias.value); + break; + + case YAML_ANCHOR_TOKEN: + yaml_free(token->data.anchor.value); + break; + + case YAML_TAG_TOKEN: + yaml_free(token->data.tag.handle); + yaml_free(token->data.tag.suffix); + break; + + case YAML_SCALAR_TOKEN: + yaml_free(token->data.scalar.value); + break; + + default: + break; + } + + memset(token, 0, sizeof(yaml_token_t)); +} + +/* + * Check if a string is a valid UTF-8 sequence. + * + * Check 'reader.c' for more details on UTF-8 encoding. + */ + +static int +yaml_check_utf8(yaml_char_t *start, size_t length) +{ + yaml_char_t *end = start+length; + yaml_char_t *pointer = start; + + while (pointer < end) { + unsigned char octet; + unsigned int width; + unsigned int value; + size_t k; + + octet = pointer[0]; + width = (octet & 0x80) == 0x00 ? 1 : + (octet & 0xE0) == 0xC0 ? 2 : + (octet & 0xF0) == 0xE0 ? 3 : + (octet & 0xF8) == 0xF0 ? 4 : 0; + value = (octet & 0x80) == 0x00 ? octet & 0x7F : + (octet & 0xE0) == 0xC0 ? octet & 0x1F : + (octet & 0xF0) == 0xE0 ? octet & 0x0F : + (octet & 0xF8) == 0xF0 ? octet & 0x07 : 0; + if (!width) return 0; + if (pointer+width > end) return 0; + for (k = 1; k < width; k ++) { + octet = pointer[k]; + if ((octet & 0xC0) != 0x80) return 0; + value = (value << 6) + (octet & 0x3F); + } + if (!((width == 1) || + (width == 2 && value >= 0x80) || + (width == 3 && value >= 0x800) || + (width == 4 && value >= 0x10000))) return 0; + + pointer += width; + } + + return 1; +} + +/* + * Create STREAM-START. + */ + +YAML_DECLARE(int) +yaml_stream_start_event_initialize(yaml_event_t *event, + yaml_encoding_t encoding) +{ + yaml_mark_t mark = { 0, 0, 0 }; + + assert(event); /* Non-NULL event object is expected. */ + + STREAM_START_EVENT_INIT(*event, encoding, mark, mark); + + return 1; +} + +/* + * Create STREAM-END. + */ + +YAML_DECLARE(int) +yaml_stream_end_event_initialize(yaml_event_t *event) +{ + yaml_mark_t mark = { 0, 0, 0 }; + + assert(event); /* Non-NULL event object is expected. */ + + STREAM_END_EVENT_INIT(*event, mark, mark); + + return 1; +} + +/* + * Create DOCUMENT-START. + */ + +YAML_DECLARE(int) +yaml_document_start_event_initialize(yaml_event_t *event, + yaml_version_directive_t *version_directive, + yaml_tag_directive_t *tag_directives_start, + yaml_tag_directive_t *tag_directives_end, + int implicit) +{ + struct { + yaml_error_type_t error; + } context; + yaml_mark_t mark = { 0, 0, 0 }; + yaml_version_directive_t *version_directive_copy = NULL; + struct { + yaml_tag_directive_t *start; + yaml_tag_directive_t *end; + yaml_tag_directive_t *top; + } tag_directives_copy = { NULL, NULL, NULL }; + yaml_tag_directive_t value = { NULL, NULL }; + + assert(event); /* Non-NULL event object is expected. */ + assert((tag_directives_start && tag_directives_end) || + (tag_directives_start == tag_directives_end)); + /* Valid tag directives are expected. */ + + if (version_directive) { + version_directive_copy = yaml_malloc(sizeof(yaml_version_directive_t)); + if (!version_directive_copy) goto error; + version_directive_copy->major = version_directive->major; + version_directive_copy->minor = version_directive->minor; + } + + if (tag_directives_start != tag_directives_end) { + yaml_tag_directive_t *tag_directive; + if (!STACK_INIT(&context, tag_directives_copy, INITIAL_STACK_SIZE)) + goto error; + for (tag_directive = tag_directives_start; + tag_directive != tag_directives_end; tag_directive ++) { + assert(tag_directive->handle); + assert(tag_directive->prefix); + if (!yaml_check_utf8(tag_directive->handle, + strlen((char *)tag_directive->handle))) + goto error; + if (!yaml_check_utf8(tag_directive->prefix, + strlen((char *)tag_directive->prefix))) + goto error; + value.handle = yaml_strdup(tag_directive->handle); + value.prefix = yaml_strdup(tag_directive->prefix); + if (!value.handle || !value.prefix) goto error; + if (!PUSH(&context, tag_directives_copy, value)) + goto error; + value.handle = NULL; + value.prefix = NULL; + } + } + + DOCUMENT_START_EVENT_INIT(*event, version_directive_copy, + tag_directives_copy.start, tag_directives_copy.top, + implicit, mark, mark); + + return 1; + +error: + yaml_free(version_directive_copy); + while (!STACK_EMPTY(context, tag_directives_copy)) { + yaml_tag_directive_t value = POP(context, tag_directives_copy); + yaml_free(value.handle); + yaml_free(value.prefix); + } + STACK_DEL(context, tag_directives_copy); + yaml_free(value.handle); + yaml_free(value.prefix); + + return 0; +} + +/* + * Create DOCUMENT-END. + */ + +YAML_DECLARE(int) +yaml_document_end_event_initialize(yaml_event_t *event, int implicit) +{ + yaml_mark_t mark = { 0, 0, 0 }; + + assert(event); /* Non-NULL emitter object is expected. */ + + DOCUMENT_END_EVENT_INIT(*event, implicit, mark, mark); + + return 1; +} + +/* + * Create ALIAS. + */ + +YAML_DECLARE(int) +yaml_alias_event_initialize(yaml_event_t *event, yaml_char_t *anchor) +{ + yaml_mark_t mark = { 0, 0, 0 }; + yaml_char_t *anchor_copy = NULL; + + assert(event); /* Non-NULL event object is expected. */ + assert(anchor); /* Non-NULL anchor is expected. */ + + if (!yaml_check_utf8(anchor, strlen((char *)anchor))) return 0; + + anchor_copy = yaml_strdup(anchor); + if (!anchor_copy) + return 0; + + ALIAS_EVENT_INIT(*event, anchor_copy, mark, mark); + + return 1; +} + +/* + * Create SCALAR. + */ + +YAML_DECLARE(int) +yaml_scalar_event_initialize(yaml_event_t *event, + yaml_char_t *anchor, yaml_char_t *tag, + yaml_char_t *value, int length, + int plain_implicit, int quoted_implicit, + yaml_scalar_style_t style) +{ + yaml_mark_t mark = { 0, 0, 0 }; + yaml_char_t *anchor_copy = NULL; + yaml_char_t *tag_copy = NULL; + yaml_char_t *value_copy = NULL; + + assert(event); /* Non-NULL event object is expected. */ + assert(value); /* Non-NULL anchor is expected. */ + + if (anchor) { + if (!yaml_check_utf8(anchor, strlen((char *)anchor))) goto error; + anchor_copy = yaml_strdup(anchor); + if (!anchor_copy) goto error; + } + + if (tag) { + if (!yaml_check_utf8(tag, strlen((char *)tag))) goto error; + tag_copy = yaml_strdup(tag); + if (!tag_copy) goto error; + } + + if (length < 0) { + length = strlen((char *)value); + } + + if (!yaml_check_utf8(value, length)) goto error; + value_copy = yaml_malloc(length+1); + if (!value_copy) goto error; + memcpy(value_copy, value, length); + value_copy[length] = '\0'; + + SCALAR_EVENT_INIT(*event, anchor_copy, tag_copy, value_copy, length, + plain_implicit, quoted_implicit, style, mark, mark); + + return 1; + +error: + yaml_free(anchor_copy); + yaml_free(tag_copy); + yaml_free(value_copy); + + return 0; +} + +/* + * Create SEQUENCE-START. + */ + +YAML_DECLARE(int) +yaml_sequence_start_event_initialize(yaml_event_t *event, + yaml_char_t *anchor, yaml_char_t *tag, int implicit, + yaml_sequence_style_t style) +{ + yaml_mark_t mark = { 0, 0, 0 }; + yaml_char_t *anchor_copy = NULL; + yaml_char_t *tag_copy = NULL; + + assert(event); /* Non-NULL event object is expected. */ + + if (anchor) { + if (!yaml_check_utf8(anchor, strlen((char *)anchor))) goto error; + anchor_copy = yaml_strdup(anchor); + if (!anchor_copy) goto error; + } + + if (tag) { + if (!yaml_check_utf8(tag, strlen((char *)tag))) goto error; + tag_copy = yaml_strdup(tag); + if (!tag_copy) goto error; + } + + SEQUENCE_START_EVENT_INIT(*event, anchor_copy, tag_copy, + implicit, style, mark, mark); + + return 1; + +error: + yaml_free(anchor_copy); + yaml_free(tag_copy); + + return 0; +} + +/* + * Create SEQUENCE-END. + */ + +YAML_DECLARE(int) +yaml_sequence_end_event_initialize(yaml_event_t *event) +{ + yaml_mark_t mark = { 0, 0, 0 }; + + assert(event); /* Non-NULL event object is expected. */ + + SEQUENCE_END_EVENT_INIT(*event, mark, mark); + + return 1; +} + +/* + * Create MAPPING-START. + */ + +YAML_DECLARE(int) +yaml_mapping_start_event_initialize(yaml_event_t *event, + yaml_char_t *anchor, yaml_char_t *tag, int implicit, + yaml_mapping_style_t style) +{ + yaml_mark_t mark = { 0, 0, 0 }; + yaml_char_t *anchor_copy = NULL; + yaml_char_t *tag_copy = NULL; + + assert(event); /* Non-NULL event object is expected. */ + + if (anchor) { + if (!yaml_check_utf8(anchor, strlen((char *)anchor))) goto error; + anchor_copy = yaml_strdup(anchor); + if (!anchor_copy) goto error; + } + + if (tag) { + if (!yaml_check_utf8(tag, strlen((char *)tag))) goto error; + tag_copy = yaml_strdup(tag); + if (!tag_copy) goto error; + } + + MAPPING_START_EVENT_INIT(*event, anchor_copy, tag_copy, + implicit, style, mark, mark); + + return 1; + +error: + yaml_free(anchor_copy); + yaml_free(tag_copy); + + return 0; +} + +/* + * Create MAPPING-END. + */ + +YAML_DECLARE(int) +yaml_mapping_end_event_initialize(yaml_event_t *event) +{ + yaml_mark_t mark = { 0, 0, 0 }; + + assert(event); /* Non-NULL event object is expected. */ + + MAPPING_END_EVENT_INIT(*event, mark, mark); + + return 1; +} + +/* + * Destroy an event object. + */ + +YAML_DECLARE(void) +yaml_event_delete(yaml_event_t *event) +{ + yaml_tag_directive_t *tag_directive; + + assert(event); /* Non-NULL event object expected. */ + + switch (event->type) + { + case YAML_DOCUMENT_START_EVENT: + yaml_free(event->data.document_start.version_directive); + for (tag_directive = event->data.document_start.tag_directives.start; + tag_directive != event->data.document_start.tag_directives.end; + tag_directive++) { + yaml_free(tag_directive->handle); + yaml_free(tag_directive->prefix); + } + yaml_free(event->data.document_start.tag_directives.start); + break; + + case YAML_ALIAS_EVENT: + yaml_free(event->data.alias.anchor); + break; + + case YAML_SCALAR_EVENT: + yaml_free(event->data.scalar.anchor); + yaml_free(event->data.scalar.tag); + yaml_free(event->data.scalar.value); + break; + + case YAML_SEQUENCE_START_EVENT: + yaml_free(event->data.sequence_start.anchor); + yaml_free(event->data.sequence_start.tag); + break; + + case YAML_MAPPING_START_EVENT: + yaml_free(event->data.mapping_start.anchor); + yaml_free(event->data.mapping_start.tag); + break; + + default: + break; + } + + memset(event, 0, sizeof(yaml_event_t)); +} + +/* + * Create a document object. + */ + +YAML_DECLARE(int) +yaml_document_initialize(yaml_document_t *document, + yaml_version_directive_t *version_directive, + yaml_tag_directive_t *tag_directives_start, + yaml_tag_directive_t *tag_directives_end, + int start_implicit, int end_implicit) +{ + struct { + yaml_error_type_t error; + } context; + struct { + yaml_node_t *start; + yaml_node_t *end; + yaml_node_t *top; + } nodes = { NULL, NULL, NULL }; + yaml_version_directive_t *version_directive_copy = NULL; + struct { + yaml_tag_directive_t *start; + yaml_tag_directive_t *end; + yaml_tag_directive_t *top; + } tag_directives_copy = { NULL, NULL, NULL }; + yaml_tag_directive_t value = { NULL, NULL }; + yaml_mark_t mark = { 0, 0, 0 }; + + assert(document); /* Non-NULL document object is expected. */ + assert((tag_directives_start && tag_directives_end) || + (tag_directives_start == tag_directives_end)); + /* Valid tag directives are expected. */ + + if (!STACK_INIT(&context, nodes, INITIAL_STACK_SIZE)) goto error; + + if (version_directive) { + version_directive_copy = yaml_malloc(sizeof(yaml_version_directive_t)); + if (!version_directive_copy) goto error; + version_directive_copy->major = version_directive->major; + version_directive_copy->minor = version_directive->minor; + } + + if (tag_directives_start != tag_directives_end) { + yaml_tag_directive_t *tag_directive; + if (!STACK_INIT(&context, tag_directives_copy, INITIAL_STACK_SIZE)) + goto error; + for (tag_directive = tag_directives_start; + tag_directive != tag_directives_end; tag_directive ++) { + assert(tag_directive->handle); + assert(tag_directive->prefix); + if (!yaml_check_utf8(tag_directive->handle, + strlen((char *)tag_directive->handle))) + goto error; + if (!yaml_check_utf8(tag_directive->prefix, + strlen((char *)tag_directive->prefix))) + goto error; + value.handle = yaml_strdup(tag_directive->handle); + value.prefix = yaml_strdup(tag_directive->prefix); + if (!value.handle || !value.prefix) goto error; + if (!PUSH(&context, tag_directives_copy, value)) + goto error; + value.handle = NULL; + value.prefix = NULL; + } + } + + DOCUMENT_INIT(*document, nodes.start, nodes.end, version_directive_copy, + tag_directives_copy.start, tag_directives_copy.top, + start_implicit, end_implicit, mark, mark); + + return 1; + +error: + STACK_DEL(&context, nodes); + yaml_free(version_directive_copy); + while (!STACK_EMPTY(&context, tag_directives_copy)) { + yaml_tag_directive_t value = POP(&context, tag_directives_copy); + yaml_free(value.handle); + yaml_free(value.prefix); + } + STACK_DEL(&context, tag_directives_copy); + yaml_free(value.handle); + yaml_free(value.prefix); + + return 0; +} + +/* + * Destroy a document object. + */ + +YAML_DECLARE(void) +yaml_document_delete(yaml_document_t *document) +{ + struct { + yaml_error_type_t error; + } context; + yaml_tag_directive_t *tag_directive; + + context.error = YAML_NO_ERROR; /* Eliminate a compliler warning. */ + + assert(document); /* Non-NULL document object is expected. */ + + while (!STACK_EMPTY(&context, document->nodes)) { + yaml_node_t node = POP(&context, document->nodes); + yaml_free(node.tag); + switch (node.type) { + case YAML_SCALAR_NODE: + yaml_free(node.data.scalar.value); + break; + case YAML_SEQUENCE_NODE: + STACK_DEL(&context, node.data.sequence.items); + break; + case YAML_MAPPING_NODE: + STACK_DEL(&context, node.data.mapping.pairs); + break; + default: + assert(0); /* Should not happen. */ + } + } + STACK_DEL(&context, document->nodes); + + yaml_free(document->version_directive); + for (tag_directive = document->tag_directives.start; + tag_directive != document->tag_directives.end; + tag_directive++) { + yaml_free(tag_directive->handle); + yaml_free(tag_directive->prefix); + } + yaml_free(document->tag_directives.start); + + memset(document, 0, sizeof(yaml_document_t)); +} + +/** + * Get a document node. + */ + +YAML_DECLARE(yaml_node_t *) +yaml_document_get_node(yaml_document_t *document, int index) +{ + assert(document); /* Non-NULL document object is expected. */ + + if (index > 0 && document->nodes.start + index <= document->nodes.top) { + return document->nodes.start + index - 1; + } + return NULL; +} + +/** + * Get the root object. + */ + +YAML_DECLARE(yaml_node_t *) +yaml_document_get_root_node(yaml_document_t *document) +{ + assert(document); /* Non-NULL document object is expected. */ + + if (document->nodes.top != document->nodes.start) { + return document->nodes.start; + } + return NULL; +} + +/* + * Add a scalar node to a document. + */ + +YAML_DECLARE(int) +yaml_document_add_scalar(yaml_document_t *document, + yaml_char_t *tag, yaml_char_t *value, int length, + yaml_scalar_style_t style) +{ + struct { + yaml_error_type_t error; + } context; + yaml_mark_t mark = { 0, 0, 0 }; + yaml_char_t *tag_copy = NULL; + yaml_char_t *value_copy = NULL; + yaml_node_t node; + + assert(document); /* Non-NULL document object is expected. */ + assert(value); /* Non-NULL value is expected. */ + + if (!tag) { + tag = (yaml_char_t *)YAML_DEFAULT_SCALAR_TAG; + } + + if (!yaml_check_utf8(tag, strlen((char *)tag))) goto error; + tag_copy = yaml_strdup(tag); + if (!tag_copy) goto error; + + if (length < 0) { + length = strlen((char *)value); + } + + if (!yaml_check_utf8(value, length)) goto error; + value_copy = yaml_malloc(length+1); + if (!value_copy) goto error; + memcpy(value_copy, value, length); + value_copy[length] = '\0'; + + SCALAR_NODE_INIT(node, tag_copy, value_copy, length, style, mark, mark); + if (!PUSH(&context, document->nodes, node)) goto error; + + return document->nodes.top - document->nodes.start; + +error: + yaml_free(tag_copy); + yaml_free(value_copy); + + return 0; +} + +/* + * Add a sequence node to a document. + */ + +YAML_DECLARE(int) +yaml_document_add_sequence(yaml_document_t *document, + yaml_char_t *tag, yaml_sequence_style_t style) +{ + struct { + yaml_error_type_t error; + } context; + yaml_mark_t mark = { 0, 0, 0 }; + yaml_char_t *tag_copy = NULL; + struct { + yaml_node_item_t *start; + yaml_node_item_t *end; + yaml_node_item_t *top; + } items = { NULL, NULL, NULL }; + yaml_node_t node; + + assert(document); /* Non-NULL document object is expected. */ + + if (!tag) { + tag = (yaml_char_t *)YAML_DEFAULT_SEQUENCE_TAG; + } + + if (!yaml_check_utf8(tag, strlen((char *)tag))) goto error; + tag_copy = yaml_strdup(tag); + if (!tag_copy) goto error; + + if (!STACK_INIT(&context, items, INITIAL_STACK_SIZE)) goto error; + + SEQUENCE_NODE_INIT(node, tag_copy, items.start, items.end, + style, mark, mark); + if (!PUSH(&context, document->nodes, node)) goto error; + + return document->nodes.top - document->nodes.start; + +error: + STACK_DEL(&context, items); + yaml_free(tag_copy); + + return 0; +} + +/* + * Add a mapping node to a document. + */ + +YAML_DECLARE(int) +yaml_document_add_mapping(yaml_document_t *document, + yaml_char_t *tag, yaml_mapping_style_t style) +{ + struct { + yaml_error_type_t error; + } context; + yaml_mark_t mark = { 0, 0, 0 }; + yaml_char_t *tag_copy = NULL; + struct { + yaml_node_pair_t *start; + yaml_node_pair_t *end; + yaml_node_pair_t *top; + } pairs = { NULL, NULL, NULL }; + yaml_node_t node; + + assert(document); /* Non-NULL document object is expected. */ + + if (!tag) { + tag = (yaml_char_t *)YAML_DEFAULT_MAPPING_TAG; + } + + if (!yaml_check_utf8(tag, strlen((char *)tag))) goto error; + tag_copy = yaml_strdup(tag); + if (!tag_copy) goto error; + + if (!STACK_INIT(&context, pairs, INITIAL_STACK_SIZE)) goto error; + + MAPPING_NODE_INIT(node, tag_copy, pairs.start, pairs.end, + style, mark, mark); + if (!PUSH(&context, document->nodes, node)) goto error; + + return document->nodes.top - document->nodes.start; + +error: + STACK_DEL(&context, pairs); + yaml_free(tag_copy); + + return 0; +} + +/* + * Append an item to a sequence node. + */ + +YAML_DECLARE(int) +yaml_document_append_sequence_item(yaml_document_t *document, + int sequence, int item) +{ + struct { + yaml_error_type_t error; + } context; + + assert(document); /* Non-NULL document is required. */ + assert(sequence > 0 + && document->nodes.start + sequence <= document->nodes.top); + /* Valid sequence id is required. */ + assert(document->nodes.start[sequence-1].type == YAML_SEQUENCE_NODE); + /* A sequence node is required. */ + assert(item > 0 && document->nodes.start + item <= document->nodes.top); + /* Valid item id is required. */ + + if (!PUSH(&context, + document->nodes.start[sequence-1].data.sequence.items, item)) + return 0; + + return 1; +} + +/* + * Append a pair of a key and a value to a mapping node. + */ + +YAML_DECLARE(int) +yaml_document_append_mapping_pair(yaml_document_t *document, + int mapping, int key, int value) +{ + struct { + yaml_error_type_t error; + } context; + + yaml_node_pair_t pair; + + assert(document); /* Non-NULL document is required. */ + assert(mapping > 0 + && document->nodes.start + mapping <= document->nodes.top); + /* Valid mapping id is required. */ + assert(document->nodes.start[mapping-1].type == YAML_MAPPING_NODE); + /* A mapping node is required. */ + assert(key > 0 && document->nodes.start + key <= document->nodes.top); + /* Valid key id is required. */ + assert(value > 0 && document->nodes.start + value <= document->nodes.top); + /* Valid value id is required. */ + + pair.key = key; + pair.value = value; + + if (!PUSH(&context, + document->nodes.start[mapping-1].data.mapping.pairs, pair)) + return 0; + + return 1; +} + + diff --git a/ext/psych/yaml/config.h b/ext/psych/yaml/config.h new file mode 100644 index 0000000000..6d6c25b3b1 --- /dev/null +++ b/ext/psych/yaml/config.h @@ -0,0 +1,11 @@ + +#define PACKAGE_NAME "yaml" +#define PACKAGE_TARNAME "yaml" +#define PACKAGE_VERSION "0.1.4" +#define PACKAGE_STRING "yaml 0.1.4" +#define PACKAGE_BUGREPORT "http://pyyaml.org/newticket?component libyaml" +#define PACKAGE_URL "" +#define YAML_VERSION_MAJOR 0 +#define YAML_VERSION_MINOR 1 +#define YAML_VERSION_PATCH 4 +#define YAML_VERSION_STRING "0.1.4" diff --git a/ext/psych/yaml/dumper.c b/ext/psych/yaml/dumper.c new file mode 100644 index 0000000000..203c6a709c --- /dev/null +++ b/ext/psych/yaml/dumper.c @@ -0,0 +1,394 @@ + +#include "yaml_private.h" + +/* + * API functions. + */ + +YAML_DECLARE(int) +yaml_emitter_open(yaml_emitter_t *emitter); + +YAML_DECLARE(int) +yaml_emitter_close(yaml_emitter_t *emitter); + +YAML_DECLARE(int) +yaml_emitter_dump(yaml_emitter_t *emitter, yaml_document_t *document); + +/* + * Clean up functions. + */ + +static void +yaml_emitter_delete_document_and_anchors(yaml_emitter_t *emitter); + +/* + * Anchor functions. + */ + +static void +yaml_emitter_anchor_node(yaml_emitter_t *emitter, int index); + +static yaml_char_t * +yaml_emitter_generate_anchor(yaml_emitter_t *emitter, int anchor_id); + + +/* + * Serialize functions. + */ + +static int +yaml_emitter_dump_node(yaml_emitter_t *emitter, int index); + +static int +yaml_emitter_dump_alias(yaml_emitter_t *emitter, yaml_char_t *anchor); + +static int +yaml_emitter_dump_scalar(yaml_emitter_t *emitter, yaml_node_t *node, + yaml_char_t *anchor); + +static int +yaml_emitter_dump_sequence(yaml_emitter_t *emitter, yaml_node_t *node, + yaml_char_t *anchor); + +static int +yaml_emitter_dump_mapping(yaml_emitter_t *emitter, yaml_node_t *node, + yaml_char_t *anchor); + +/* + * Issue a STREAM-START event. + */ + +YAML_DECLARE(int) +yaml_emitter_open(yaml_emitter_t *emitter) +{ + yaml_event_t event; + yaml_mark_t mark = { 0, 0, 0 }; + + assert(emitter); /* Non-NULL emitter object is required. */ + assert(!emitter->opened); /* Emitter should not be opened yet. */ + + STREAM_START_EVENT_INIT(event, YAML_ANY_ENCODING, mark, mark); + + if (!yaml_emitter_emit(emitter, &event)) { + return 0; + } + + emitter->opened = 1; + + return 1; +} + +/* + * Issue a STREAM-END event. + */ + +YAML_DECLARE(int) +yaml_emitter_close(yaml_emitter_t *emitter) +{ + yaml_event_t event; + yaml_mark_t mark = { 0, 0, 0 }; + + assert(emitter); /* Non-NULL emitter object is required. */ + assert(emitter->opened); /* Emitter should be opened. */ + + if (emitter->closed) return 1; + + STREAM_END_EVENT_INIT(event, mark, mark); + + if (!yaml_emitter_emit(emitter, &event)) { + return 0; + } + + emitter->closed = 1; + + return 1; +} + +/* + * Dump a YAML document. + */ + +YAML_DECLARE(int) +yaml_emitter_dump(yaml_emitter_t *emitter, yaml_document_t *document) +{ + yaml_event_t event; + yaml_mark_t mark = { 0, 0, 0 }; + + assert(emitter); /* Non-NULL emitter object is required. */ + assert(document); /* Non-NULL emitter object is expected. */ + + emitter->document = document; + + if (!emitter->opened) { + if (!yaml_emitter_open(emitter)) goto error; + } + + if (STACK_EMPTY(emitter, document->nodes)) { + if (!yaml_emitter_close(emitter)) goto error; + yaml_emitter_delete_document_and_anchors(emitter); + return 1; + } + + assert(emitter->opened); /* Emitter should be opened. */ + + emitter->anchors = yaml_malloc(sizeof(*(emitter->anchors)) + * (document->nodes.top - document->nodes.start)); + if (!emitter->anchors) goto error; + memset(emitter->anchors, 0, sizeof(*(emitter->anchors)) + * (document->nodes.top - document->nodes.start)); + + DOCUMENT_START_EVENT_INIT(event, document->version_directive, + document->tag_directives.start, document->tag_directives.end, + document->start_implicit, mark, mark); + if (!yaml_emitter_emit(emitter, &event)) goto error; + + yaml_emitter_anchor_node(emitter, 1); + if (!yaml_emitter_dump_node(emitter, 1)) goto error; + + DOCUMENT_END_EVENT_INIT(event, document->end_implicit, mark, mark); + if (!yaml_emitter_emit(emitter, &event)) goto error; + + yaml_emitter_delete_document_and_anchors(emitter); + + return 1; + +error: + + yaml_emitter_delete_document_and_anchors(emitter); + + return 0; +} + +/* + * Clean up the emitter object after a document is dumped. + */ + +static void +yaml_emitter_delete_document_and_anchors(yaml_emitter_t *emitter) +{ + int index; + + if (!emitter->anchors) { + yaml_document_delete(emitter->document); + emitter->document = NULL; + return; + } + + for (index = 0; emitter->document->nodes.start + index + < emitter->document->nodes.top; index ++) { + yaml_node_t node = emitter->document->nodes.start[index]; + if (!emitter->anchors[index].serialized) { + yaml_free(node.tag); + if (node.type == YAML_SCALAR_NODE) { + yaml_free(node.data.scalar.value); + } + } + if (node.type == YAML_SEQUENCE_NODE) { + STACK_DEL(emitter, node.data.sequence.items); + } + if (node.type == YAML_MAPPING_NODE) { + STACK_DEL(emitter, node.data.mapping.pairs); + } + } + + STACK_DEL(emitter, emitter->document->nodes); + yaml_free(emitter->anchors); + + emitter->anchors = NULL; + emitter->last_anchor_id = 0; + emitter->document = NULL; +} + +/* + * Check the references of a node and assign the anchor id if needed. + */ + +static void +yaml_emitter_anchor_node(yaml_emitter_t *emitter, int index) +{ + yaml_node_t *node = emitter->document->nodes.start + index - 1; + yaml_node_item_t *item; + yaml_node_pair_t *pair; + + emitter->anchors[index-1].references ++; + + if (emitter->anchors[index-1].references == 1) { + switch (node->type) { + case YAML_SEQUENCE_NODE: + for (item = node->data.sequence.items.start; + item < node->data.sequence.items.top; item ++) { + yaml_emitter_anchor_node(emitter, *item); + } + break; + case YAML_MAPPING_NODE: + for (pair = node->data.mapping.pairs.start; + pair < node->data.mapping.pairs.top; pair ++) { + yaml_emitter_anchor_node(emitter, pair->key); + yaml_emitter_anchor_node(emitter, pair->value); + } + break; + default: + break; + } + } + + else if (emitter->anchors[index-1].references == 2) { + emitter->anchors[index-1].anchor = (++ emitter->last_anchor_id); + } +} + +/* + * Generate a textual representation for an anchor. + */ + +#define ANCHOR_TEMPLATE "id%03d" +#define ANCHOR_TEMPLATE_LENGTH 16 + +static yaml_char_t * +yaml_emitter_generate_anchor(yaml_emitter_t *emitter, int anchor_id) +{ + yaml_char_t *anchor = yaml_malloc(ANCHOR_TEMPLATE_LENGTH); + + if (!anchor) return NULL; + + sprintf((char *)anchor, ANCHOR_TEMPLATE, anchor_id); + + return anchor; +} + +/* + * Serialize a node. + */ + +static int +yaml_emitter_dump_node(yaml_emitter_t *emitter, int index) +{ + yaml_node_t *node = emitter->document->nodes.start + index - 1; + int anchor_id = emitter->anchors[index-1].anchor; + yaml_char_t *anchor = NULL; + + if (anchor_id) { + anchor = yaml_emitter_generate_anchor(emitter, anchor_id); + if (!anchor) return 0; + } + + if (emitter->anchors[index-1].serialized) { + return yaml_emitter_dump_alias(emitter, anchor); + } + + emitter->anchors[index-1].serialized = 1; + + switch (node->type) { + case YAML_SCALAR_NODE: + return yaml_emitter_dump_scalar(emitter, node, anchor); + case YAML_SEQUENCE_NODE: + return yaml_emitter_dump_sequence(emitter, node, anchor); + case YAML_MAPPING_NODE: + return yaml_emitter_dump_mapping(emitter, node, anchor); + default: + assert(0); /* Could not happen. */ + break; + } + + return 0; /* Could not happen. */ +} + +/* + * Serialize an alias. + */ + +static int +yaml_emitter_dump_alias(yaml_emitter_t *emitter, yaml_char_t *anchor) +{ + yaml_event_t event; + yaml_mark_t mark = { 0, 0, 0 }; + + ALIAS_EVENT_INIT(event, anchor, mark, mark); + + return yaml_emitter_emit(emitter, &event); +} + +/* + * Serialize a scalar. + */ + +static int +yaml_emitter_dump_scalar(yaml_emitter_t *emitter, yaml_node_t *node, + yaml_char_t *anchor) +{ + yaml_event_t event; + yaml_mark_t mark = { 0, 0, 0 }; + + int plain_implicit = (strcmp((char *)node->tag, + YAML_DEFAULT_SCALAR_TAG) == 0); + int quoted_implicit = (strcmp((char *)node->tag, + YAML_DEFAULT_SCALAR_TAG) == 0); + + SCALAR_EVENT_INIT(event, anchor, node->tag, node->data.scalar.value, + node->data.scalar.length, plain_implicit, quoted_implicit, + node->data.scalar.style, mark, mark); + + return yaml_emitter_emit(emitter, &event); +} + +/* + * Serialize a sequence. + */ + +static int +yaml_emitter_dump_sequence(yaml_emitter_t *emitter, yaml_node_t *node, + yaml_char_t *anchor) +{ + yaml_event_t event; + yaml_mark_t mark = { 0, 0, 0 }; + + int implicit = (strcmp((char *)node->tag, YAML_DEFAULT_SEQUENCE_TAG) == 0); + + yaml_node_item_t *item; + + SEQUENCE_START_EVENT_INIT(event, anchor, node->tag, implicit, + node->data.sequence.style, mark, mark); + if (!yaml_emitter_emit(emitter, &event)) return 0; + + for (item = node->data.sequence.items.start; + item < node->data.sequence.items.top; item ++) { + if (!yaml_emitter_dump_node(emitter, *item)) return 0; + } + + SEQUENCE_END_EVENT_INIT(event, mark, mark); + if (!yaml_emitter_emit(emitter, &event)) return 0; + + return 1; +} + +/* + * Serialize a mapping. + */ + +static int +yaml_emitter_dump_mapping(yaml_emitter_t *emitter, yaml_node_t *node, + yaml_char_t *anchor) +{ + yaml_event_t event; + yaml_mark_t mark = { 0, 0, 0 }; + + int implicit = (strcmp((char *)node->tag, YAML_DEFAULT_MAPPING_TAG) == 0); + + yaml_node_pair_t *pair; + + MAPPING_START_EVENT_INIT(event, anchor, node->tag, implicit, + node->data.mapping.style, mark, mark); + if (!yaml_emitter_emit(emitter, &event)) return 0; + + for (pair = node->data.mapping.pairs.start; + pair < node->data.mapping.pairs.top; pair ++) { + if (!yaml_emitter_dump_node(emitter, pair->key)) return 0; + if (!yaml_emitter_dump_node(emitter, pair->value)) return 0; + } + + MAPPING_END_EVENT_INIT(event, mark, mark); + if (!yaml_emitter_emit(emitter, &event)) return 0; + + return 1; +} + diff --git a/ext/psych/yaml/emitter.c b/ext/psych/yaml/emitter.c new file mode 100644 index 0000000000..c4b56a26bb --- /dev/null +++ b/ext/psych/yaml/emitter.c @@ -0,0 +1,2329 @@ + +#include "yaml_private.h" + +/* + * Flush the buffer if needed. + */ + +#define FLUSH(emitter) \ + ((emitter->buffer.pointer+5 < emitter->buffer.end) \ + || yaml_emitter_flush(emitter)) + +/* + * Put a character to the output buffer. + */ + +#define PUT(emitter,value) \ + (FLUSH(emitter) \ + && (*(emitter->buffer.pointer++) = (yaml_char_t)(value), \ + emitter->column ++, \ + 1)) + +/* + * Put a line break to the output buffer. + */ + +#define PUT_BREAK(emitter) \ + (FLUSH(emitter) \ + && ((emitter->line_break == YAML_CR_BREAK ? \ + (*(emitter->buffer.pointer++) = (yaml_char_t) '\r') : \ + emitter->line_break == YAML_LN_BREAK ? \ + (*(emitter->buffer.pointer++) = (yaml_char_t) '\n') : \ + emitter->line_break == YAML_CRLN_BREAK ? \ + (*(emitter->buffer.pointer++) = (yaml_char_t) '\r', \ + *(emitter->buffer.pointer++) = (yaml_char_t) '\n') : 0), \ + emitter->column = 0, \ + emitter->line ++, \ + 1)) + +/* + * Copy a character from a string into buffer. + */ + +#define WRITE(emitter,string) \ + (FLUSH(emitter) \ + && (COPY(emitter->buffer,string), \ + emitter->column ++, \ + 1)) + +/* + * Copy a line break character from a string into buffer. + */ + +#define WRITE_BREAK(emitter,string) \ + (FLUSH(emitter) \ + && (CHECK(string,'\n') ? \ + (PUT_BREAK(emitter), \ + string.pointer ++, \ + 1) : \ + (COPY(emitter->buffer,string), \ + emitter->column = 0, \ + emitter->line ++, \ + 1))) + +/* + * API functions. + */ + +YAML_DECLARE(int) +yaml_emitter_emit(yaml_emitter_t *emitter, yaml_event_t *event); + +/* + * Utility functions. + */ + +static int +yaml_emitter_set_emitter_error(yaml_emitter_t *emitter, const char *problem); + +static int +yaml_emitter_need_more_events(yaml_emitter_t *emitter); + +static int +yaml_emitter_append_tag_directive(yaml_emitter_t *emitter, + yaml_tag_directive_t value, int allow_duplicates); + +static int +yaml_emitter_increase_indent(yaml_emitter_t *emitter, + int flow, int indentless); + +/* + * State functions. + */ + +static int +yaml_emitter_state_machine(yaml_emitter_t *emitter, yaml_event_t *event); + +static int +yaml_emitter_emit_stream_start(yaml_emitter_t *emitter, + yaml_event_t *event); + +static int +yaml_emitter_emit_document_start(yaml_emitter_t *emitter, + yaml_event_t *event, int first); + +static int +yaml_emitter_emit_document_content(yaml_emitter_t *emitter, + yaml_event_t *event); + +static int +yaml_emitter_emit_document_end(yaml_emitter_t *emitter, + yaml_event_t *event); + +static int +yaml_emitter_emit_flow_sequence_item(yaml_emitter_t *emitter, + yaml_event_t *event, int first); + +static int +yaml_emitter_emit_flow_mapping_key(yaml_emitter_t *emitter, + yaml_event_t *event, int first); + +static int +yaml_emitter_emit_flow_mapping_value(yaml_emitter_t *emitter, + yaml_event_t *event, int simple); + +static int +yaml_emitter_emit_block_sequence_item(yaml_emitter_t *emitter, + yaml_event_t *event, int first); + +static int +yaml_emitter_emit_block_mapping_key(yaml_emitter_t *emitter, + yaml_event_t *event, int first); + +static int +yaml_emitter_emit_block_mapping_value(yaml_emitter_t *emitter, + yaml_event_t *event, int simple); + +static int +yaml_emitter_emit_node(yaml_emitter_t *emitter, yaml_event_t *event, + int root, int sequence, int mapping, int simple_key); + +static int +yaml_emitter_emit_alias(yaml_emitter_t *emitter, yaml_event_t *event); + +static int +yaml_emitter_emit_scalar(yaml_emitter_t *emitter, yaml_event_t *event); + +static int +yaml_emitter_emit_sequence_start(yaml_emitter_t *emitter, yaml_event_t *event); + +static int +yaml_emitter_emit_mapping_start(yaml_emitter_t *emitter, yaml_event_t *event); + +/* + * Checkers. + */ + +static int +yaml_emitter_check_empty_document(yaml_emitter_t *emitter); + +static int +yaml_emitter_check_empty_sequence(yaml_emitter_t *emitter); + +static int +yaml_emitter_check_empty_mapping(yaml_emitter_t *emitter); + +static int +yaml_emitter_check_simple_key(yaml_emitter_t *emitter); + +static int +yaml_emitter_select_scalar_style(yaml_emitter_t *emitter, yaml_event_t *event); + +/* + * Processors. + */ + +static int +yaml_emitter_process_anchor(yaml_emitter_t *emitter); + +static int +yaml_emitter_process_tag(yaml_emitter_t *emitter); + +static int +yaml_emitter_process_scalar(yaml_emitter_t *emitter); + +/* + * Analyzers. + */ + +static int +yaml_emitter_analyze_version_directive(yaml_emitter_t *emitter, + yaml_version_directive_t version_directive); + +static int +yaml_emitter_analyze_tag_directive(yaml_emitter_t *emitter, + yaml_tag_directive_t tag_directive); + +static int +yaml_emitter_analyze_anchor(yaml_emitter_t *emitter, + yaml_char_t *anchor, int alias); + +static int +yaml_emitter_analyze_tag(yaml_emitter_t *emitter, + yaml_char_t *tag); + +static int +yaml_emitter_analyze_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length); + +static int +yaml_emitter_analyze_event(yaml_emitter_t *emitter, + yaml_event_t *event); + +/* + * Writers. + */ + +static int +yaml_emitter_write_bom(yaml_emitter_t *emitter); + +static int +yaml_emitter_write_indent(yaml_emitter_t *emitter); + +static int +yaml_emitter_write_indicator(yaml_emitter_t *emitter, + char *indicator, int need_whitespace, + int is_whitespace, int is_indention); + +static int +yaml_emitter_write_anchor(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length); + +static int +yaml_emitter_write_tag_handle(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length); + +static int +yaml_emitter_write_tag_content(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length, int need_whitespace); + +static int +yaml_emitter_write_plain_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length, int allow_breaks); + +static int +yaml_emitter_write_single_quoted_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length, int allow_breaks); + +static int +yaml_emitter_write_double_quoted_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length, int allow_breaks); + +static int +yaml_emitter_write_block_scalar_hints(yaml_emitter_t *emitter, + yaml_string_t string); + +static int +yaml_emitter_write_literal_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length); + +static int +yaml_emitter_write_folded_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length); + +/* + * Set an emitter error and return 0. + */ + +static int +yaml_emitter_set_emitter_error(yaml_emitter_t *emitter, const char *problem) +{ + emitter->error = YAML_EMITTER_ERROR; + emitter->problem = problem; + + return 0; +} + +/* + * Emit an event. + */ + +YAML_DECLARE(int) +yaml_emitter_emit(yaml_emitter_t *emitter, yaml_event_t *event) +{ + if (!ENQUEUE(emitter, emitter->events, *event)) { + yaml_event_delete(event); + return 0; + } + + while (!yaml_emitter_need_more_events(emitter)) { + if (!yaml_emitter_analyze_event(emitter, emitter->events.head)) + return 0; + if (!yaml_emitter_state_machine(emitter, emitter->events.head)) + return 0; + yaml_event_delete(&DEQUEUE(emitter, emitter->events)); + } + + return 1; +} + +/* + * Check if we need to accumulate more events before emitting. + * + * We accumulate extra + * - 1 event for DOCUMENT-START + * - 2 events for SEQUENCE-START + * - 3 events for MAPPING-START + */ + +static int +yaml_emitter_need_more_events(yaml_emitter_t *emitter) +{ + int level = 0; + int accumulate = 0; + yaml_event_t *event; + + if (QUEUE_EMPTY(emitter, emitter->events)) + return 1; + + switch (emitter->events.head->type) { + case YAML_DOCUMENT_START_EVENT: + accumulate = 1; + break; + case YAML_SEQUENCE_START_EVENT: + accumulate = 2; + break; + case YAML_MAPPING_START_EVENT: + accumulate = 3; + break; + default: + return 0; + } + + if (emitter->events.tail - emitter->events.head > accumulate) + return 0; + + for (event = emitter->events.head; event != emitter->events.tail; event ++) { + switch (event->type) { + case YAML_STREAM_START_EVENT: + case YAML_DOCUMENT_START_EVENT: + case YAML_SEQUENCE_START_EVENT: + case YAML_MAPPING_START_EVENT: + level += 1; + break; + case YAML_STREAM_END_EVENT: + case YAML_DOCUMENT_END_EVENT: + case YAML_SEQUENCE_END_EVENT: + case YAML_MAPPING_END_EVENT: + level -= 1; + break; + default: + break; + } + if (!level) + return 0; + } + + return 1; +} + +/* + * Append a directive to the directives stack. + */ + +static int +yaml_emitter_append_tag_directive(yaml_emitter_t *emitter, + yaml_tag_directive_t value, int allow_duplicates) +{ + yaml_tag_directive_t *tag_directive; + yaml_tag_directive_t copy = { NULL, NULL }; + + for (tag_directive = emitter->tag_directives.start; + tag_directive != emitter->tag_directives.top; tag_directive ++) { + if (strcmp((char *)value.handle, (char *)tag_directive->handle) == 0) { + if (allow_duplicates) + return 1; + return yaml_emitter_set_emitter_error(emitter, + "duplicate %TAG directive"); + } + } + + copy.handle = yaml_strdup(value.handle); + copy.prefix = yaml_strdup(value.prefix); + if (!copy.handle || !copy.prefix) { + emitter->error = YAML_MEMORY_ERROR; + goto error; + } + + if (!PUSH(emitter, emitter->tag_directives, copy)) + goto error; + + return 1; + +error: + yaml_free(copy.handle); + yaml_free(copy.prefix); + return 0; +} + +/* + * Increase the indentation level. + */ + +static int +yaml_emitter_increase_indent(yaml_emitter_t *emitter, + int flow, int indentless) +{ + if (!PUSH(emitter, emitter->indents, emitter->indent)) + return 0; + + if (emitter->indent < 0) { + emitter->indent = flow ? emitter->best_indent : 0; + } + else if (!indentless) { + emitter->indent += emitter->best_indent; + } + + return 1; +} + +/* + * State dispatcher. + */ + +static int +yaml_emitter_state_machine(yaml_emitter_t *emitter, yaml_event_t *event) +{ + switch (emitter->state) + { + case YAML_EMIT_STREAM_START_STATE: + return yaml_emitter_emit_stream_start(emitter, event); + + case YAML_EMIT_FIRST_DOCUMENT_START_STATE: + return yaml_emitter_emit_document_start(emitter, event, 1); + + case YAML_EMIT_DOCUMENT_START_STATE: + return yaml_emitter_emit_document_start(emitter, event, 0); + + case YAML_EMIT_DOCUMENT_CONTENT_STATE: + return yaml_emitter_emit_document_content(emitter, event); + + case YAML_EMIT_DOCUMENT_END_STATE: + return yaml_emitter_emit_document_end(emitter, event); + + case YAML_EMIT_FLOW_SEQUENCE_FIRST_ITEM_STATE: + return yaml_emitter_emit_flow_sequence_item(emitter, event, 1); + + case YAML_EMIT_FLOW_SEQUENCE_ITEM_STATE: + return yaml_emitter_emit_flow_sequence_item(emitter, event, 0); + + case YAML_EMIT_FLOW_MAPPING_FIRST_KEY_STATE: + return yaml_emitter_emit_flow_mapping_key(emitter, event, 1); + + case YAML_EMIT_FLOW_MAPPING_KEY_STATE: + return yaml_emitter_emit_flow_mapping_key(emitter, event, 0); + + case YAML_EMIT_FLOW_MAPPING_SIMPLE_VALUE_STATE: + return yaml_emitter_emit_flow_mapping_value(emitter, event, 1); + + case YAML_EMIT_FLOW_MAPPING_VALUE_STATE: + return yaml_emitter_emit_flow_mapping_value(emitter, event, 0); + + case YAML_EMIT_BLOCK_SEQUENCE_FIRST_ITEM_STATE: + return yaml_emitter_emit_block_sequence_item(emitter, event, 1); + + case YAML_EMIT_BLOCK_SEQUENCE_ITEM_STATE: + return yaml_emitter_emit_block_sequence_item(emitter, event, 0); + + case YAML_EMIT_BLOCK_MAPPING_FIRST_KEY_STATE: + return yaml_emitter_emit_block_mapping_key(emitter, event, 1); + + case YAML_EMIT_BLOCK_MAPPING_KEY_STATE: + return yaml_emitter_emit_block_mapping_key(emitter, event, 0); + + case YAML_EMIT_BLOCK_MAPPING_SIMPLE_VALUE_STATE: + return yaml_emitter_emit_block_mapping_value(emitter, event, 1); + + case YAML_EMIT_BLOCK_MAPPING_VALUE_STATE: + return yaml_emitter_emit_block_mapping_value(emitter, event, 0); + + case YAML_EMIT_END_STATE: + return yaml_emitter_set_emitter_error(emitter, + "expected nothing after STREAM-END"); + + default: + assert(1); /* Invalid state. */ + } + + return 0; +} + +/* + * Expect STREAM-START. + */ + +static int +yaml_emitter_emit_stream_start(yaml_emitter_t *emitter, + yaml_event_t *event) +{ + if (event->type == YAML_STREAM_START_EVENT) + { + if (!emitter->encoding) { + emitter->encoding = event->data.stream_start.encoding; + } + + if (!emitter->encoding) { + emitter->encoding = YAML_UTF8_ENCODING; + } + + if (emitter->best_indent < 2 || emitter->best_indent > 9) { + emitter->best_indent = 2; + } + + if (emitter->best_width >= 0 + && emitter->best_width <= emitter->best_indent*2) { + emitter->best_width = 80; + } + + if (emitter->best_width < 0) { + emitter->best_width = INT_MAX; + } + + if (!emitter->line_break) { + emitter->line_break = YAML_LN_BREAK; + } + + emitter->indent = -1; + + emitter->line = 0; + emitter->column = 0; + emitter->whitespace = 1; + emitter->indention = 1; + + if (emitter->encoding != YAML_UTF8_ENCODING) { + if (!yaml_emitter_write_bom(emitter)) + return 0; + } + + emitter->state = YAML_EMIT_FIRST_DOCUMENT_START_STATE; + + return 1; + } + + return yaml_emitter_set_emitter_error(emitter, + "expected STREAM-START"); +} + +/* + * Expect DOCUMENT-START or STREAM-END. + */ + +static int +yaml_emitter_emit_document_start(yaml_emitter_t *emitter, + yaml_event_t *event, int first) +{ + if (event->type == YAML_DOCUMENT_START_EVENT) + { + yaml_tag_directive_t default_tag_directives[] = { + {(yaml_char_t *)"!", (yaml_char_t *)"!"}, + {(yaml_char_t *)"!!", (yaml_char_t *)"tag:yaml.org,2002:"}, + {NULL, NULL} + }; + yaml_tag_directive_t *tag_directive; + int implicit; + + if (event->data.document_start.version_directive) { + if (!yaml_emitter_analyze_version_directive(emitter, + *event->data.document_start.version_directive)) + return 0; + } + + for (tag_directive = event->data.document_start.tag_directives.start; + tag_directive != event->data.document_start.tag_directives.end; + tag_directive ++) { + if (!yaml_emitter_analyze_tag_directive(emitter, *tag_directive)) + return 0; + if (!yaml_emitter_append_tag_directive(emitter, *tag_directive, 0)) + return 0; + } + + for (tag_directive = default_tag_directives; + tag_directive->handle; tag_directive ++) { + if (!yaml_emitter_append_tag_directive(emitter, *tag_directive, 1)) + return 0; + } + + implicit = event->data.document_start.implicit; + if (!first || emitter->canonical) { + implicit = 0; + } + + if ((event->data.document_start.version_directive || + (event->data.document_start.tag_directives.start + != event->data.document_start.tag_directives.end)) && + emitter->open_ended) + { + if (!yaml_emitter_write_indicator(emitter, "...", 1, 0, 0)) + return 0; + if (!yaml_emitter_write_indent(emitter)) + return 0; + } + + if (event->data.document_start.version_directive) { + implicit = 0; + if (!yaml_emitter_write_indicator(emitter, "%YAML", 1, 0, 0)) + return 0; + if (!yaml_emitter_write_indicator(emitter, "1.1", 1, 0, 0)) + return 0; + if (!yaml_emitter_write_indent(emitter)) + return 0; + } + + if (event->data.document_start.tag_directives.start + != event->data.document_start.tag_directives.end) { + implicit = 0; + for (tag_directive = event->data.document_start.tag_directives.start; + tag_directive != event->data.document_start.tag_directives.end; + tag_directive ++) { + if (!yaml_emitter_write_indicator(emitter, "%TAG", 1, 0, 0)) + return 0; + if (!yaml_emitter_write_tag_handle(emitter, tag_directive->handle, + strlen((char *)tag_directive->handle))) + return 0; + if (!yaml_emitter_write_tag_content(emitter, tag_directive->prefix, + strlen((char *)tag_directive->prefix), 1)) + return 0; + if (!yaml_emitter_write_indent(emitter)) + return 0; + } + } + + if (yaml_emitter_check_empty_document(emitter)) { + implicit = 0; + } + + if (!implicit) { + if (!yaml_emitter_write_indent(emitter)) + return 0; + if (!yaml_emitter_write_indicator(emitter, "---", 1, 0, 0)) + return 0; + if (emitter->canonical) { + if (!yaml_emitter_write_indent(emitter)) + return 0; + } + } + + emitter->state = YAML_EMIT_DOCUMENT_CONTENT_STATE; + + return 1; + } + + else if (event->type == YAML_STREAM_END_EVENT) + { + if (emitter->open_ended) + { + if (!yaml_emitter_write_indicator(emitter, "...", 1, 0, 0)) + return 0; + if (!yaml_emitter_write_indent(emitter)) + return 0; + } + + if (!yaml_emitter_flush(emitter)) + return 0; + + emitter->state = YAML_EMIT_END_STATE; + + return 1; + } + + return yaml_emitter_set_emitter_error(emitter, + "expected DOCUMENT-START or STREAM-END"); +} + +/* + * Expect the root node. + */ + +static int +yaml_emitter_emit_document_content(yaml_emitter_t *emitter, + yaml_event_t *event) +{ + if (!PUSH(emitter, emitter->states, YAML_EMIT_DOCUMENT_END_STATE)) + return 0; + + return yaml_emitter_emit_node(emitter, event, 1, 0, 0, 0); +} + +/* + * Expect DOCUMENT-END. + */ + +static int +yaml_emitter_emit_document_end(yaml_emitter_t *emitter, + yaml_event_t *event) +{ + if (event->type == YAML_DOCUMENT_END_EVENT) + { + if (!yaml_emitter_write_indent(emitter)) + return 0; + if (!event->data.document_end.implicit) { + if (!yaml_emitter_write_indicator(emitter, "...", 1, 0, 0)) + return 0; + if (!yaml_emitter_write_indent(emitter)) + return 0; + } + if (!yaml_emitter_flush(emitter)) + return 0; + + emitter->state = YAML_EMIT_DOCUMENT_START_STATE; + + while (!STACK_EMPTY(emitter, emitter->tag_directives)) { + yaml_tag_directive_t tag_directive = POP(emitter, + emitter->tag_directives); + yaml_free(tag_directive.handle); + yaml_free(tag_directive.prefix); + } + + return 1; + } + + return yaml_emitter_set_emitter_error(emitter, + "expected DOCUMENT-END"); +} + +/* + * + * Expect a flow item node. + */ + +static int +yaml_emitter_emit_flow_sequence_item(yaml_emitter_t *emitter, + yaml_event_t *event, int first) +{ + if (first) + { + if (!yaml_emitter_write_indicator(emitter, "[", 1, 1, 0)) + return 0; + if (!yaml_emitter_increase_indent(emitter, 1, 0)) + return 0; + emitter->flow_level ++; + } + + if (event->type == YAML_SEQUENCE_END_EVENT) + { + emitter->flow_level --; + emitter->indent = POP(emitter, emitter->indents); + if (emitter->canonical && !first) { + if (!yaml_emitter_write_indicator(emitter, ",", 0, 0, 0)) + return 0; + if (!yaml_emitter_write_indent(emitter)) + return 0; + } + if (!yaml_emitter_write_indicator(emitter, "]", 0, 0, 0)) + return 0; + emitter->state = POP(emitter, emitter->states); + + return 1; + } + + if (!first) { + if (!yaml_emitter_write_indicator(emitter, ",", 0, 0, 0)) + return 0; + } + + if (emitter->canonical || emitter->column > emitter->best_width) { + if (!yaml_emitter_write_indent(emitter)) + return 0; + } + if (!PUSH(emitter, emitter->states, YAML_EMIT_FLOW_SEQUENCE_ITEM_STATE)) + return 0; + + return yaml_emitter_emit_node(emitter, event, 0, 1, 0, 0); +} + +/* + * Expect a flow key node. + */ + +static int +yaml_emitter_emit_flow_mapping_key(yaml_emitter_t *emitter, + yaml_event_t *event, int first) +{ + if (first) + { + if (!yaml_emitter_write_indicator(emitter, "{", 1, 1, 0)) + return 0; + if (!yaml_emitter_increase_indent(emitter, 1, 0)) + return 0; + emitter->flow_level ++; + } + + if (event->type == YAML_MAPPING_END_EVENT) + { + emitter->flow_level --; + emitter->indent = POP(emitter, emitter->indents); + if (emitter->canonical && !first) { + if (!yaml_emitter_write_indicator(emitter, ",", 0, 0, 0)) + return 0; + if (!yaml_emitter_write_indent(emitter)) + return 0; + } + if (!yaml_emitter_write_indicator(emitter, "}", 0, 0, 0)) + return 0; + emitter->state = POP(emitter, emitter->states); + + return 1; + } + + if (!first) { + if (!yaml_emitter_write_indicator(emitter, ",", 0, 0, 0)) + return 0; + } + if (emitter->canonical || emitter->column > emitter->best_width) { + if (!yaml_emitter_write_indent(emitter)) + return 0; + } + + if (!emitter->canonical && yaml_emitter_check_simple_key(emitter)) + { + if (!PUSH(emitter, emitter->states, + YAML_EMIT_FLOW_MAPPING_SIMPLE_VALUE_STATE)) + return 0; + + return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 1); + } + else + { + if (!yaml_emitter_write_indicator(emitter, "?", 1, 0, 0)) + return 0; + if (!PUSH(emitter, emitter->states, + YAML_EMIT_FLOW_MAPPING_VALUE_STATE)) + return 0; + + return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 0); + } +} + +/* + * Expect a flow value node. + */ + +static int +yaml_emitter_emit_flow_mapping_value(yaml_emitter_t *emitter, + yaml_event_t *event, int simple) +{ + if (simple) { + if (!yaml_emitter_write_indicator(emitter, ":", 0, 0, 0)) + return 0; + } + else { + if (emitter->canonical || emitter->column > emitter->best_width) { + if (!yaml_emitter_write_indent(emitter)) + return 0; + } + if (!yaml_emitter_write_indicator(emitter, ":", 1, 0, 0)) + return 0; + } + if (!PUSH(emitter, emitter->states, YAML_EMIT_FLOW_MAPPING_KEY_STATE)) + return 0; + return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 0); +} + +/* + * Expect a block item node. + */ + +static int +yaml_emitter_emit_block_sequence_item(yaml_emitter_t *emitter, + yaml_event_t *event, int first) +{ + if (first) + { + if (!yaml_emitter_increase_indent(emitter, 0, + (emitter->mapping_context && !emitter->indention))) + return 0; + } + + if (event->type == YAML_SEQUENCE_END_EVENT) + { + emitter->indent = POP(emitter, emitter->indents); + emitter->state = POP(emitter, emitter->states); + + return 1; + } + + if (!yaml_emitter_write_indent(emitter)) + return 0; + if (!yaml_emitter_write_indicator(emitter, "-", 1, 0, 1)) + return 0; + if (!PUSH(emitter, emitter->states, + YAML_EMIT_BLOCK_SEQUENCE_ITEM_STATE)) + return 0; + + return yaml_emitter_emit_node(emitter, event, 0, 1, 0, 0); +} + +/* + * Expect a block key node. + */ + +static int +yaml_emitter_emit_block_mapping_key(yaml_emitter_t *emitter, + yaml_event_t *event, int first) +{ + if (first) + { + if (!yaml_emitter_increase_indent(emitter, 0, 0)) + return 0; + } + + if (event->type == YAML_MAPPING_END_EVENT) + { + emitter->indent = POP(emitter, emitter->indents); + emitter->state = POP(emitter, emitter->states); + + return 1; + } + + if (!yaml_emitter_write_indent(emitter)) + return 0; + + if (yaml_emitter_check_simple_key(emitter)) + { + if (!PUSH(emitter, emitter->states, + YAML_EMIT_BLOCK_MAPPING_SIMPLE_VALUE_STATE)) + return 0; + + return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 1); + } + else + { + if (!yaml_emitter_write_indicator(emitter, "?", 1, 0, 1)) + return 0; + if (!PUSH(emitter, emitter->states, + YAML_EMIT_BLOCK_MAPPING_VALUE_STATE)) + return 0; + + return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 0); + } +} + +/* + * Expect a block value node. + */ + +static int +yaml_emitter_emit_block_mapping_value(yaml_emitter_t *emitter, + yaml_event_t *event, int simple) +{ + if (simple) { + if (!yaml_emitter_write_indicator(emitter, ":", 0, 0, 0)) + return 0; + } + else { + if (!yaml_emitter_write_indent(emitter)) + return 0; + if (!yaml_emitter_write_indicator(emitter, ":", 1, 0, 1)) + return 0; + } + if (!PUSH(emitter, emitter->states, + YAML_EMIT_BLOCK_MAPPING_KEY_STATE)) + return 0; + + return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 0); +} + +/* + * Expect a node. + */ + +static int +yaml_emitter_emit_node(yaml_emitter_t *emitter, yaml_event_t *event, + int root, int sequence, int mapping, int simple_key) +{ + emitter->root_context = root; + emitter->sequence_context = sequence; + emitter->mapping_context = mapping; + emitter->simple_key_context = simple_key; + + switch (event->type) + { + case YAML_ALIAS_EVENT: + return yaml_emitter_emit_alias(emitter, event); + + case YAML_SCALAR_EVENT: + return yaml_emitter_emit_scalar(emitter, event); + + case YAML_SEQUENCE_START_EVENT: + return yaml_emitter_emit_sequence_start(emitter, event); + + case YAML_MAPPING_START_EVENT: + return yaml_emitter_emit_mapping_start(emitter, event); + + default: + return yaml_emitter_set_emitter_error(emitter, + "expected SCALAR, SEQUENCE-START, MAPPING-START, or ALIAS"); + } + + return 0; +} + +/* + * Expect ALIAS. + */ + +static int +yaml_emitter_emit_alias(yaml_emitter_t *emitter, yaml_event_t *event) +{ + if (!yaml_emitter_process_anchor(emitter)) + return 0; + emitter->state = POP(emitter, emitter->states); + + return 1; +} + +/* + * Expect SCALAR. + */ + +static int +yaml_emitter_emit_scalar(yaml_emitter_t *emitter, yaml_event_t *event) +{ + if (!yaml_emitter_select_scalar_style(emitter, event)) + return 0; + if (!yaml_emitter_process_anchor(emitter)) + return 0; + if (!yaml_emitter_process_tag(emitter)) + return 0; + if (!yaml_emitter_increase_indent(emitter, 1, 0)) + return 0; + if (!yaml_emitter_process_scalar(emitter)) + return 0; + emitter->indent = POP(emitter, emitter->indents); + emitter->state = POP(emitter, emitter->states); + + return 1; +} + +/* + * Expect SEQUENCE-START. + */ + +static int +yaml_emitter_emit_sequence_start(yaml_emitter_t *emitter, yaml_event_t *event) +{ + if (!yaml_emitter_process_anchor(emitter)) + return 0; + if (!yaml_emitter_process_tag(emitter)) + return 0; + + if (emitter->flow_level || emitter->canonical + || event->data.sequence_start.style == YAML_FLOW_SEQUENCE_STYLE + || yaml_emitter_check_empty_sequence(emitter)) { + emitter->state = YAML_EMIT_FLOW_SEQUENCE_FIRST_ITEM_STATE; + } + else { + emitter->state = YAML_EMIT_BLOCK_SEQUENCE_FIRST_ITEM_STATE; + } + + return 1; +} + +/* + * Expect MAPPING-START. + */ + +static int +yaml_emitter_emit_mapping_start(yaml_emitter_t *emitter, yaml_event_t *event) +{ + if (!yaml_emitter_process_anchor(emitter)) + return 0; + if (!yaml_emitter_process_tag(emitter)) + return 0; + + if (emitter->flow_level || emitter->canonical + || event->data.mapping_start.style == YAML_FLOW_MAPPING_STYLE + || yaml_emitter_check_empty_mapping(emitter)) { + emitter->state = YAML_EMIT_FLOW_MAPPING_FIRST_KEY_STATE; + } + else { + emitter->state = YAML_EMIT_BLOCK_MAPPING_FIRST_KEY_STATE; + } + + return 1; +} + +/* + * Check if the document content is an empty scalar. + */ + +static int +yaml_emitter_check_empty_document(yaml_emitter_t *emitter) +{ + return 0; +} + +/* + * Check if the next events represent an empty sequence. + */ + +static int +yaml_emitter_check_empty_sequence(yaml_emitter_t *emitter) +{ + if (emitter->events.tail - emitter->events.head < 2) + return 0; + + return (emitter->events.head[0].type == YAML_SEQUENCE_START_EVENT + && emitter->events.head[1].type == YAML_SEQUENCE_END_EVENT); +} + +/* + * Check if the next events represent an empty mapping. + */ + +static int +yaml_emitter_check_empty_mapping(yaml_emitter_t *emitter) +{ + if (emitter->events.tail - emitter->events.head < 2) + return 0; + + return (emitter->events.head[0].type == YAML_MAPPING_START_EVENT + && emitter->events.head[1].type == YAML_MAPPING_END_EVENT); +} + +/* + * Check if the next node can be expressed as a simple key. + */ + +static int +yaml_emitter_check_simple_key(yaml_emitter_t *emitter) +{ + yaml_event_t *event = emitter->events.head; + size_t length = 0; + + switch (event->type) + { + case YAML_ALIAS_EVENT: + length += emitter->anchor_data.anchor_length; + break; + + case YAML_SCALAR_EVENT: + if (emitter->scalar_data.multiline) + return 0; + length += emitter->anchor_data.anchor_length + + emitter->tag_data.handle_length + + emitter->tag_data.suffix_length + + emitter->scalar_data.length; + break; + + case YAML_SEQUENCE_START_EVENT: + if (!yaml_emitter_check_empty_sequence(emitter)) + return 0; + length += emitter->anchor_data.anchor_length + + emitter->tag_data.handle_length + + emitter->tag_data.suffix_length; + break; + + case YAML_MAPPING_START_EVENT: + if (!yaml_emitter_check_empty_mapping(emitter)) + return 0; + length += emitter->anchor_data.anchor_length + + emitter->tag_data.handle_length + + emitter->tag_data.suffix_length; + break; + + default: + return 0; + } + + if (length > 128) + return 0; + + return 1; +} + +/* + * Determine an acceptable scalar style. + */ + +static int +yaml_emitter_select_scalar_style(yaml_emitter_t *emitter, yaml_event_t *event) +{ + yaml_scalar_style_t style = event->data.scalar.style; + int no_tag = (!emitter->tag_data.handle && !emitter->tag_data.suffix); + + if (no_tag && !event->data.scalar.plain_implicit + && !event->data.scalar.quoted_implicit) { + return yaml_emitter_set_emitter_error(emitter, + "neither tag nor implicit flags are specified"); + } + + if (style == YAML_ANY_SCALAR_STYLE) + style = YAML_PLAIN_SCALAR_STYLE; + + if (emitter->canonical) + style = YAML_DOUBLE_QUOTED_SCALAR_STYLE; + + if (emitter->simple_key_context && emitter->scalar_data.multiline) + style = YAML_DOUBLE_QUOTED_SCALAR_STYLE; + + if (style == YAML_PLAIN_SCALAR_STYLE) + { + if ((emitter->flow_level && !emitter->scalar_data.flow_plain_allowed) + || (!emitter->flow_level && !emitter->scalar_data.block_plain_allowed)) + style = YAML_SINGLE_QUOTED_SCALAR_STYLE; + if (!emitter->scalar_data.length + && (emitter->flow_level || emitter->simple_key_context)) + style = YAML_SINGLE_QUOTED_SCALAR_STYLE; + if (no_tag && !event->data.scalar.plain_implicit) + style = YAML_SINGLE_QUOTED_SCALAR_STYLE; + } + + if (style == YAML_SINGLE_QUOTED_SCALAR_STYLE) + { + if (!emitter->scalar_data.single_quoted_allowed) + style = YAML_DOUBLE_QUOTED_SCALAR_STYLE; + } + + if (style == YAML_LITERAL_SCALAR_STYLE || style == YAML_FOLDED_SCALAR_STYLE) + { + if (!emitter->scalar_data.block_allowed + || emitter->flow_level || emitter->simple_key_context) + style = YAML_DOUBLE_QUOTED_SCALAR_STYLE; + } + + if (no_tag && !event->data.scalar.quoted_implicit + && style != YAML_PLAIN_SCALAR_STYLE) + { + emitter->tag_data.handle = (yaml_char_t *)"!"; + emitter->tag_data.handle_length = 1; + } + + emitter->scalar_data.style = style; + + return 1; +} + +/* + * Write an achor. + */ + +static int +yaml_emitter_process_anchor(yaml_emitter_t *emitter) +{ + if (!emitter->anchor_data.anchor) + return 1; + + if (!yaml_emitter_write_indicator(emitter, + (emitter->anchor_data.alias ? "*" : "&"), 1, 0, 0)) + return 0; + + return yaml_emitter_write_anchor(emitter, + emitter->anchor_data.anchor, emitter->anchor_data.anchor_length); +} + +/* + * Write a tag. + */ + +static int +yaml_emitter_process_tag(yaml_emitter_t *emitter) +{ + if (!emitter->tag_data.handle && !emitter->tag_data.suffix) + return 1; + + if (emitter->tag_data.handle) + { + if (!yaml_emitter_write_tag_handle(emitter, emitter->tag_data.handle, + emitter->tag_data.handle_length)) + return 0; + if (emitter->tag_data.suffix) { + if (!yaml_emitter_write_tag_content(emitter, emitter->tag_data.suffix, + emitter->tag_data.suffix_length, 0)) + return 0; + } + } + else + { + if (!yaml_emitter_write_indicator(emitter, "!<", 1, 0, 0)) + return 0; + if (!yaml_emitter_write_tag_content(emitter, emitter->tag_data.suffix, + emitter->tag_data.suffix_length, 0)) + return 0; + if (!yaml_emitter_write_indicator(emitter, ">", 0, 0, 0)) + return 0; + } + + return 1; +} + +/* + * Write a scalar. + */ + +static int +yaml_emitter_process_scalar(yaml_emitter_t *emitter) +{ + switch (emitter->scalar_data.style) + { + case YAML_PLAIN_SCALAR_STYLE: + return yaml_emitter_write_plain_scalar(emitter, + emitter->scalar_data.value, emitter->scalar_data.length, + !emitter->simple_key_context); + + case YAML_SINGLE_QUOTED_SCALAR_STYLE: + return yaml_emitter_write_single_quoted_scalar(emitter, + emitter->scalar_data.value, emitter->scalar_data.length, + !emitter->simple_key_context); + + case YAML_DOUBLE_QUOTED_SCALAR_STYLE: + return yaml_emitter_write_double_quoted_scalar(emitter, + emitter->scalar_data.value, emitter->scalar_data.length, + !emitter->simple_key_context); + + case YAML_LITERAL_SCALAR_STYLE: + return yaml_emitter_write_literal_scalar(emitter, + emitter->scalar_data.value, emitter->scalar_data.length); + + case YAML_FOLDED_SCALAR_STYLE: + return yaml_emitter_write_folded_scalar(emitter, + emitter->scalar_data.value, emitter->scalar_data.length); + + default: + assert(1); /* Impossible. */ + } + + return 0; +} + +/* + * Check if a %YAML directive is valid. + */ + +static int +yaml_emitter_analyze_version_directive(yaml_emitter_t *emitter, + yaml_version_directive_t version_directive) +{ + if (version_directive.major != 1 || version_directive.minor != 1) { + return yaml_emitter_set_emitter_error(emitter, + "incompatible %YAML directive"); + } + + return 1; +} + +/* + * Check if a %TAG directive is valid. + */ + +static int +yaml_emitter_analyze_tag_directive(yaml_emitter_t *emitter, + yaml_tag_directive_t tag_directive) +{ + yaml_string_t handle; + yaml_string_t prefix; + size_t handle_length; + size_t prefix_length; + + handle_length = strlen((char *)tag_directive.handle); + prefix_length = strlen((char *)tag_directive.prefix); + STRING_ASSIGN(handle, tag_directive.handle, handle_length); + STRING_ASSIGN(prefix, tag_directive.prefix, prefix_length); + + if (handle.start == handle.end) { + return yaml_emitter_set_emitter_error(emitter, + "tag handle must not be empty"); + } + + if (handle.start[0] != '!') { + return yaml_emitter_set_emitter_error(emitter, + "tag handle must start with '!'"); + } + + if (handle.end[-1] != '!') { + return yaml_emitter_set_emitter_error(emitter, + "tag handle must end with '!'"); + } + + handle.pointer ++; + + while (handle.pointer < handle.end-1) { + if (!IS_ALPHA(handle)) { + return yaml_emitter_set_emitter_error(emitter, + "tag handle must contain alphanumerical characters only"); + } + MOVE(handle); + } + + if (prefix.start == prefix.end) { + return yaml_emitter_set_emitter_error(emitter, + "tag prefix must not be empty"); + } + + return 1; +} + +/* + * Check if an anchor is valid. + */ + +static int +yaml_emitter_analyze_anchor(yaml_emitter_t *emitter, + yaml_char_t *anchor, int alias) +{ + size_t anchor_length; + yaml_string_t string; + + anchor_length = strlen((char *)anchor); + STRING_ASSIGN(string, anchor, anchor_length); + + if (string.start == string.end) { + return yaml_emitter_set_emitter_error(emitter, alias ? + "alias value must not be empty" : + "anchor value must not be empty"); + } + + while (string.pointer != string.end) { + if (!IS_ALPHA(string)) { + return yaml_emitter_set_emitter_error(emitter, alias ? + "alias value must contain alphanumerical characters only" : + "anchor value must contain alphanumerical characters only"); + } + MOVE(string); + } + + emitter->anchor_data.anchor = string.start; + emitter->anchor_data.anchor_length = string.end - string.start; + emitter->anchor_data.alias = alias; + + return 1; +} + +/* + * Check if a tag is valid. + */ + +static int +yaml_emitter_analyze_tag(yaml_emitter_t *emitter, + yaml_char_t *tag) +{ + size_t tag_length; + yaml_string_t string; + yaml_tag_directive_t *tag_directive; + + tag_length = strlen((char *)tag); + STRING_ASSIGN(string, tag, tag_length); + + if (string.start == string.end) { + return yaml_emitter_set_emitter_error(emitter, + "tag value must not be empty"); + } + + for (tag_directive = emitter->tag_directives.start; + tag_directive != emitter->tag_directives.top; tag_directive ++) { + size_t prefix_length = strlen((char *)tag_directive->prefix); + if (prefix_length < (size_t)(string.end - string.start) + && strncmp((char *)tag_directive->prefix, (char *)string.start, + prefix_length) == 0) + { + emitter->tag_data.handle = tag_directive->handle; + emitter->tag_data.handle_length = + strlen((char *)tag_directive->handle); + emitter->tag_data.suffix = string.start + prefix_length; + emitter->tag_data.suffix_length = + (string.end - string.start) - prefix_length; + return 1; + } + } + + emitter->tag_data.suffix = string.start; + emitter->tag_data.suffix_length = string.end - string.start; + + return 1; +} + +/* + * Check if a scalar is valid. + */ + +static int +yaml_emitter_analyze_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length) +{ + yaml_string_t string; + + int block_indicators = 0; + int flow_indicators = 0; + int line_breaks = 0; + int special_characters = 0; + + int leading_space = 0; + int leading_break = 0; + int trailing_space = 0; + int trailing_break = 0; + int break_space = 0; + int space_break = 0; + + int preceeded_by_whitespace = 0; + int followed_by_whitespace = 0; + int previous_space = 0; + int previous_break = 0; + + STRING_ASSIGN(string, value, length); + + emitter->scalar_data.value = value; + emitter->scalar_data.length = length; + + if (string.start == string.end) + { + emitter->scalar_data.multiline = 0; + emitter->scalar_data.flow_plain_allowed = 0; + emitter->scalar_data.block_plain_allowed = 1; + emitter->scalar_data.single_quoted_allowed = 1; + emitter->scalar_data.block_allowed = 0; + + return 1; + } + + if ((CHECK_AT(string, '-', 0) + && CHECK_AT(string, '-', 1) + && CHECK_AT(string, '-', 2)) + || (CHECK_AT(string, '.', 0) + && CHECK_AT(string, '.', 1) + && CHECK_AT(string, '.', 2))) { + block_indicators = 1; + flow_indicators = 1; + } + + preceeded_by_whitespace = 1; + followed_by_whitespace = IS_BLANKZ_AT(string, WIDTH(string)); + + while (string.pointer != string.end) + { + if (string.start == string.pointer) + { + if (CHECK(string, '#') || CHECK(string, ',') + || CHECK(string, '[') || CHECK(string, ']') + || CHECK(string, '{') || CHECK(string, '}') + || CHECK(string, '&') || CHECK(string, '*') + || CHECK(string, '!') || CHECK(string, '|') + || CHECK(string, '>') || CHECK(string, '\'') + || CHECK(string, '"') || CHECK(string, '%') + || CHECK(string, '@') || CHECK(string, '`')) { + flow_indicators = 1; + block_indicators = 1; + } + + if (CHECK(string, '?') || CHECK(string, ':')) { + flow_indicators = 1; + if (followed_by_whitespace) { + block_indicators = 1; + } + } + + if (CHECK(string, '-') && followed_by_whitespace) { + flow_indicators = 1; + block_indicators = 1; + } + } + else + { + if (CHECK(string, ',') || CHECK(string, '?') + || CHECK(string, '[') || CHECK(string, ']') + || CHECK(string, '{') || CHECK(string, '}')) { + flow_indicators = 1; + } + + if (CHECK(string, ':')) { + flow_indicators = 1; + if (followed_by_whitespace) { + block_indicators = 1; + } + } + + if (CHECK(string, '#') && preceeded_by_whitespace) { + flow_indicators = 1; + block_indicators = 1; + } + } + + if (!IS_PRINTABLE(string) + || (!IS_ASCII(string) && !emitter->unicode)) { + special_characters = 1; + } + + if (IS_BREAK(string)) { + line_breaks = 1; + } + + if (IS_SPACE(string)) + { + if (string.start == string.pointer) { + leading_space = 1; + } + if (string.pointer+WIDTH(string) == string.end) { + trailing_space = 1; + } + if (previous_break) { + break_space = 1; + } + previous_space = 1; + previous_break = 0; + } + else if (IS_BREAK(string)) + { + if (string.start == string.pointer) { + leading_break = 1; + } + if (string.pointer+WIDTH(string) == string.end) { + trailing_break = 1; + } + if (previous_space) { + space_break = 1; + } + previous_space = 0; + previous_break = 1; + } + else + { + previous_space = 0; + previous_break = 0; + } + + preceeded_by_whitespace = IS_BLANKZ(string); + MOVE(string); + if (string.pointer != string.end) { + followed_by_whitespace = IS_BLANKZ_AT(string, WIDTH(string)); + } + } + + emitter->scalar_data.multiline = line_breaks; + + emitter->scalar_data.flow_plain_allowed = 1; + emitter->scalar_data.block_plain_allowed = 1; + emitter->scalar_data.single_quoted_allowed = 1; + emitter->scalar_data.block_allowed = 1; + + if (leading_space || leading_break || trailing_space || trailing_break) { + emitter->scalar_data.flow_plain_allowed = 0; + emitter->scalar_data.block_plain_allowed = 0; + } + + if (trailing_space) { + emitter->scalar_data.block_allowed = 0; + } + + if (break_space) { + emitter->scalar_data.flow_plain_allowed = 0; + emitter->scalar_data.block_plain_allowed = 0; + emitter->scalar_data.single_quoted_allowed = 0; + } + + if (space_break || special_characters) { + emitter->scalar_data.flow_plain_allowed = 0; + emitter->scalar_data.block_plain_allowed = 0; + emitter->scalar_data.single_quoted_allowed = 0; + emitter->scalar_data.block_allowed = 0; + } + + if (line_breaks) { + emitter->scalar_data.flow_plain_allowed = 0; + emitter->scalar_data.block_plain_allowed = 0; + } + + if (flow_indicators) { + emitter->scalar_data.flow_plain_allowed = 0; + } + + if (block_indicators) { + emitter->scalar_data.block_plain_allowed = 0; + } + + return 1; +} + +/* + * Check if the event data is valid. + */ + +static int +yaml_emitter_analyze_event(yaml_emitter_t *emitter, + yaml_event_t *event) +{ + emitter->anchor_data.anchor = NULL; + emitter->anchor_data.anchor_length = 0; + emitter->tag_data.handle = NULL; + emitter->tag_data.handle_length = 0; + emitter->tag_data.suffix = NULL; + emitter->tag_data.suffix_length = 0; + emitter->scalar_data.value = NULL; + emitter->scalar_data.length = 0; + + switch (event->type) + { + case YAML_ALIAS_EVENT: + if (!yaml_emitter_analyze_anchor(emitter, + event->data.alias.anchor, 1)) + return 0; + return 1; + + case YAML_SCALAR_EVENT: + if (event->data.scalar.anchor) { + if (!yaml_emitter_analyze_anchor(emitter, + event->data.scalar.anchor, 0)) + return 0; + } + if (event->data.scalar.tag && (emitter->canonical || + (!event->data.scalar.plain_implicit + && !event->data.scalar.quoted_implicit))) { + if (!yaml_emitter_analyze_tag(emitter, event->data.scalar.tag)) + return 0; + } + if (!yaml_emitter_analyze_scalar(emitter, + event->data.scalar.value, event->data.scalar.length)) + return 0; + return 1; + + case YAML_SEQUENCE_START_EVENT: + if (event->data.sequence_start.anchor) { + if (!yaml_emitter_analyze_anchor(emitter, + event->data.sequence_start.anchor, 0)) + return 0; + } + if (event->data.sequence_start.tag && (emitter->canonical || + !event->data.sequence_start.implicit)) { + if (!yaml_emitter_analyze_tag(emitter, + event->data.sequence_start.tag)) + return 0; + } + return 1; + + case YAML_MAPPING_START_EVENT: + if (event->data.mapping_start.anchor) { + if (!yaml_emitter_analyze_anchor(emitter, + event->data.mapping_start.anchor, 0)) + return 0; + } + if (event->data.mapping_start.tag && (emitter->canonical || + !event->data.mapping_start.implicit)) { + if (!yaml_emitter_analyze_tag(emitter, + event->data.mapping_start.tag)) + return 0; + } + return 1; + + default: + return 1; + } +} + +/* + * Write the BOM character. + */ + +static int +yaml_emitter_write_bom(yaml_emitter_t *emitter) +{ + if (!FLUSH(emitter)) return 0; + + *(emitter->buffer.pointer++) = (yaml_char_t) '\xEF'; + *(emitter->buffer.pointer++) = (yaml_char_t) '\xBB'; + *(emitter->buffer.pointer++) = (yaml_char_t) '\xBF'; + + return 1; +} + +static int +yaml_emitter_write_indent(yaml_emitter_t *emitter) +{ + int indent = (emitter->indent >= 0) ? emitter->indent : 0; + + if (!emitter->indention || emitter->column > indent + || (emitter->column == indent && !emitter->whitespace)) { + if (!PUT_BREAK(emitter)) return 0; + } + + while (emitter->column < indent) { + if (!PUT(emitter, ' ')) return 0; + } + + emitter->whitespace = 1; + emitter->indention = 1; + + return 1; +} + +static int +yaml_emitter_write_indicator(yaml_emitter_t *emitter, + char *indicator, int need_whitespace, + int is_whitespace, int is_indention) +{ + size_t indicator_length; + yaml_string_t string; + + indicator_length = strlen(indicator); + STRING_ASSIGN(string, (yaml_char_t *)indicator, indicator_length); + + if (need_whitespace && !emitter->whitespace) { + if (!PUT(emitter, ' ')) return 0; + } + + while (string.pointer != string.end) { + if (!WRITE(emitter, string)) return 0; + } + + emitter->whitespace = is_whitespace; + emitter->indention = (emitter->indention && is_indention); + emitter->open_ended = 0; + + return 1; +} + +static int +yaml_emitter_write_anchor(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length) +{ + yaml_string_t string; + STRING_ASSIGN(string, value, length); + + while (string.pointer != string.end) { + if (!WRITE(emitter, string)) return 0; + } + + emitter->whitespace = 0; + emitter->indention = 0; + + return 1; +} + +static int +yaml_emitter_write_tag_handle(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length) +{ + yaml_string_t string; + STRING_ASSIGN(string, value, length); + + if (!emitter->whitespace) { + if (!PUT(emitter, ' ')) return 0; + } + + while (string.pointer != string.end) { + if (!WRITE(emitter, string)) return 0; + } + + emitter->whitespace = 0; + emitter->indention = 0; + + return 1; +} + +static int +yaml_emitter_write_tag_content(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length, + int need_whitespace) +{ + yaml_string_t string; + STRING_ASSIGN(string, value, length); + + if (need_whitespace && !emitter->whitespace) { + if (!PUT(emitter, ' ')) return 0; + } + + while (string.pointer != string.end) { + if (IS_ALPHA(string) + || CHECK(string, ';') || CHECK(string, '/') + || CHECK(string, '?') || CHECK(string, ':') + || CHECK(string, '@') || CHECK(string, '&') + || CHECK(string, '=') || CHECK(string, '+') + || CHECK(string, '$') || CHECK(string, ',') + || CHECK(string, '_') || CHECK(string, '.') + || CHECK(string, '~') || CHECK(string, '*') + || CHECK(string, '\'') || CHECK(string, '(') + || CHECK(string, ')') || CHECK(string, '[') + || CHECK(string, ']')) { + if (!WRITE(emitter, string)) return 0; + } + else { + int width = WIDTH(string); + unsigned int value; + while (width --) { + value = *(string.pointer++); + if (!PUT(emitter, '%')) return 0; + if (!PUT(emitter, (value >> 4) + + ((value >> 4) < 10 ? '0' : 'A' - 10))) + return 0; + if (!PUT(emitter, (value & 0x0F) + + ((value & 0x0F) < 10 ? '0' : 'A' - 10))) + return 0; + } + } + } + + emitter->whitespace = 0; + emitter->indention = 0; + + return 1; +} + +static int +yaml_emitter_write_plain_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length, int allow_breaks) +{ + yaml_string_t string; + int spaces = 0; + int breaks = 0; + + STRING_ASSIGN(string, value, length); + + if (!emitter->whitespace) { + if (!PUT(emitter, ' ')) return 0; + } + + while (string.pointer != string.end) + { + if (IS_SPACE(string)) + { + if (allow_breaks && !spaces + && emitter->column > emitter->best_width + && !IS_SPACE_AT(string, 1)) { + if (!yaml_emitter_write_indent(emitter)) return 0; + MOVE(string); + } + else { + if (!WRITE(emitter, string)) return 0; + } + spaces = 1; + } + else if (IS_BREAK(string)) + { + if (!breaks && CHECK(string, '\n')) { + if (!PUT_BREAK(emitter)) return 0; + } + if (!WRITE_BREAK(emitter, string)) return 0; + emitter->indention = 1; + breaks = 1; + } + else + { + if (breaks) { + if (!yaml_emitter_write_indent(emitter)) return 0; + } + if (!WRITE(emitter, string)) return 0; + emitter->indention = 0; + spaces = 0; + breaks = 0; + } + } + + emitter->whitespace = 0; + emitter->indention = 0; + if (emitter->root_context) + { + emitter->open_ended = 1; + } + + return 1; +} + +static int +yaml_emitter_write_single_quoted_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length, int allow_breaks) +{ + yaml_string_t string; + int spaces = 0; + int breaks = 0; + + STRING_ASSIGN(string, value, length); + + if (!yaml_emitter_write_indicator(emitter, "'", 1, 0, 0)) + return 0; + + while (string.pointer != string.end) + { + if (IS_SPACE(string)) + { + if (allow_breaks && !spaces + && emitter->column > emitter->best_width + && string.pointer != string.start + && string.pointer != string.end - 1 + && !IS_SPACE_AT(string, 1)) { + if (!yaml_emitter_write_indent(emitter)) return 0; + MOVE(string); + } + else { + if (!WRITE(emitter, string)) return 0; + } + spaces = 1; + } + else if (IS_BREAK(string)) + { + if (!breaks && CHECK(string, '\n')) { + if (!PUT_BREAK(emitter)) return 0; + } + if (!WRITE_BREAK(emitter, string)) return 0; + emitter->indention = 1; + breaks = 1; + } + else + { + if (breaks) { + if (!yaml_emitter_write_indent(emitter)) return 0; + } + if (CHECK(string, '\'')) { + if (!PUT(emitter, '\'')) return 0; + } + if (!WRITE(emitter, string)) return 0; + emitter->indention = 0; + spaces = 0; + breaks = 0; + } + } + + if (!yaml_emitter_write_indicator(emitter, "'", 0, 0, 0)) + return 0; + + emitter->whitespace = 0; + emitter->indention = 0; + + return 1; +} + +static int +yaml_emitter_write_double_quoted_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length, int allow_breaks) +{ + yaml_string_t string; + int spaces = 0; + + STRING_ASSIGN(string, value, length); + + if (!yaml_emitter_write_indicator(emitter, "\"", 1, 0, 0)) + return 0; + + while (string.pointer != string.end) + { + if (!IS_PRINTABLE(string) || (!emitter->unicode && !IS_ASCII(string)) + || IS_BOM(string) || IS_BREAK(string) + || CHECK(string, '"') || CHECK(string, '\\')) + { + unsigned char octet; + unsigned int width; + unsigned int value; + int k; + + octet = string.pointer[0]; + width = (octet & 0x80) == 0x00 ? 1 : + (octet & 0xE0) == 0xC0 ? 2 : + (octet & 0xF0) == 0xE0 ? 3 : + (octet & 0xF8) == 0xF0 ? 4 : 0; + value = (octet & 0x80) == 0x00 ? octet & 0x7F : + (octet & 0xE0) == 0xC0 ? octet & 0x1F : + (octet & 0xF0) == 0xE0 ? octet & 0x0F : + (octet & 0xF8) == 0xF0 ? octet & 0x07 : 0; + for (k = 1; k < (int)width; k ++) { + octet = string.pointer[k]; + value = (value << 6) + (octet & 0x3F); + } + string.pointer += width; + + if (!PUT(emitter, '\\')) return 0; + + switch (value) + { + case 0x00: + if (!PUT(emitter, '0')) return 0; + break; + + case 0x07: + if (!PUT(emitter, 'a')) return 0; + break; + + case 0x08: + if (!PUT(emitter, 'b')) return 0; + break; + + case 0x09: + if (!PUT(emitter, 't')) return 0; + break; + + case 0x0A: + if (!PUT(emitter, 'n')) return 0; + break; + + case 0x0B: + if (!PUT(emitter, 'v')) return 0; + break; + + case 0x0C: + if (!PUT(emitter, 'f')) return 0; + break; + + case 0x0D: + if (!PUT(emitter, 'r')) return 0; + break; + + case 0x1B: + if (!PUT(emitter, 'e')) return 0; + break; + + case 0x22: + if (!PUT(emitter, '\"')) return 0; + break; + + case 0x5C: + if (!PUT(emitter, '\\')) return 0; + break; + + case 0x85: + if (!PUT(emitter, 'N')) return 0; + break; + + case 0xA0: + if (!PUT(emitter, '_')) return 0; + break; + + case 0x2028: + if (!PUT(emitter, 'L')) return 0; + break; + + case 0x2029: + if (!PUT(emitter, 'P')) return 0; + break; + + default: + if (value <= 0xFF) { + if (!PUT(emitter, 'x')) return 0; + width = 2; + } + else if (value <= 0xFFFF) { + if (!PUT(emitter, 'u')) return 0; + width = 4; + } + else { + if (!PUT(emitter, 'U')) return 0; + width = 8; + } + for (k = (width-1)*4; k >= 0; k -= 4) { + int digit = (value >> k) & 0x0F; + if (!PUT(emitter, digit + (digit < 10 ? '0' : 'A'-10))) + return 0; + } + } + spaces = 0; + } + else if (IS_SPACE(string)) + { + if (allow_breaks && !spaces + && emitter->column > emitter->best_width + && string.pointer != string.start + && string.pointer != string.end - 1) { + if (!yaml_emitter_write_indent(emitter)) return 0; + if (IS_SPACE_AT(string, 1)) { + if (!PUT(emitter, '\\')) return 0; + } + MOVE(string); + } + else { + if (!WRITE(emitter, string)) return 0; + } + spaces = 1; + } + else + { + if (!WRITE(emitter, string)) return 0; + spaces = 0; + } + } + + if (!yaml_emitter_write_indicator(emitter, "\"", 0, 0, 0)) + return 0; + + emitter->whitespace = 0; + emitter->indention = 0; + + return 1; +} + +static int +yaml_emitter_write_block_scalar_hints(yaml_emitter_t *emitter, + yaml_string_t string) +{ + char indent_hint[2]; + char *chomp_hint = NULL; + + if (IS_SPACE(string) || IS_BREAK(string)) + { + indent_hint[0] = '0' + (char)emitter->best_indent; + indent_hint[1] = '\0'; + if (!yaml_emitter_write_indicator(emitter, indent_hint, 0, 0, 0)) + return 0; + } + + emitter->open_ended = 0; + + string.pointer = string.end; + if (string.start == string.pointer) + { + chomp_hint = "-"; + } + else + { + do { + string.pointer --; + } while ((*string.pointer & 0xC0) == 0x80); + if (!IS_BREAK(string)) + { + chomp_hint = "-"; + } + else if (string.start == string.pointer) + { + chomp_hint = "+"; + emitter->open_ended = 1; + } + else + { + do { + string.pointer --; + } while ((*string.pointer & 0xC0) == 0x80); + if (IS_BREAK(string)) + { + chomp_hint = "+"; + emitter->open_ended = 1; + } + } + } + + if (chomp_hint) + { + if (!yaml_emitter_write_indicator(emitter, chomp_hint, 0, 0, 0)) + return 0; + } + + return 1; +} + +static int +yaml_emitter_write_literal_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length) +{ + yaml_string_t string; + int breaks = 1; + + STRING_ASSIGN(string, value, length); + + if (!yaml_emitter_write_indicator(emitter, "|", 1, 0, 0)) + return 0; + if (!yaml_emitter_write_block_scalar_hints(emitter, string)) + return 0; + if (!PUT_BREAK(emitter)) return 0; + emitter->indention = 1; + emitter->whitespace = 1; + + while (string.pointer != string.end) + { + if (IS_BREAK(string)) + { + if (!WRITE_BREAK(emitter, string)) return 0; + emitter->indention = 1; + breaks = 1; + } + else + { + if (breaks) { + if (!yaml_emitter_write_indent(emitter)) return 0; + } + if (!WRITE(emitter, string)) return 0; + emitter->indention = 0; + breaks = 0; + } + } + + return 1; +} + +static int +yaml_emitter_write_folded_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length) +{ + yaml_string_t string; + int breaks = 1; + int leading_spaces = 1; + + STRING_ASSIGN(string, value, length); + + if (!yaml_emitter_write_indicator(emitter, ">", 1, 0, 0)) + return 0; + if (!yaml_emitter_write_block_scalar_hints(emitter, string)) + return 0; + if (!PUT_BREAK(emitter)) return 0; + emitter->indention = 1; + emitter->whitespace = 1; + + while (string.pointer != string.end) + { + if (IS_BREAK(string)) + { + if (!breaks && !leading_spaces && CHECK(string, '\n')) { + int k = 0; + while (IS_BREAK_AT(string, k)) { + k += WIDTH_AT(string, k); + } + if (!IS_BLANKZ_AT(string, k)) { + if (!PUT_BREAK(emitter)) return 0; + } + } + if (!WRITE_BREAK(emitter, string)) return 0; + emitter->indention = 1; + breaks = 1; + } + else + { + if (breaks) { + if (!yaml_emitter_write_indent(emitter)) return 0; + leading_spaces = IS_BLANK(string); + } + if (!breaks && IS_SPACE(string) && !IS_SPACE_AT(string, 1) + && emitter->column > emitter->best_width) { + if (!yaml_emitter_write_indent(emitter)) return 0; + MOVE(string); + } + else { + if (!WRITE(emitter, string)) return 0; + } + emitter->indention = 0; + breaks = 0; + } + } + + return 1; +} + diff --git a/ext/psych/yaml/loader.c b/ext/psych/yaml/loader.c new file mode 100644 index 0000000000..9d3d912663 --- /dev/null +++ b/ext/psych/yaml/loader.c @@ -0,0 +1,432 @@ + +#include "yaml_private.h" + +/* + * API functions. + */ + +YAML_DECLARE(int) +yaml_parser_load(yaml_parser_t *parser, yaml_document_t *document); + +/* + * Error handling. + */ + +static int +yaml_parser_set_composer_error(yaml_parser_t *parser, + const char *problem, yaml_mark_t problem_mark); + +static int +yaml_parser_set_composer_error_context(yaml_parser_t *parser, + const char *context, yaml_mark_t context_mark, + const char *problem, yaml_mark_t problem_mark); + + +/* + * Alias handling. + */ + +static int +yaml_parser_register_anchor(yaml_parser_t *parser, + int index, yaml_char_t *anchor); + +/* + * Clean up functions. + */ + +static void +yaml_parser_delete_aliases(yaml_parser_t *parser); + +/* + * Composer functions. + */ + +static int +yaml_parser_load_document(yaml_parser_t *parser, yaml_event_t *first_event); + +static int +yaml_parser_load_node(yaml_parser_t *parser, yaml_event_t *first_event); + +static int +yaml_parser_load_alias(yaml_parser_t *parser, yaml_event_t *first_event); + +static int +yaml_parser_load_scalar(yaml_parser_t *parser, yaml_event_t *first_event); + +static int +yaml_parser_load_sequence(yaml_parser_t *parser, yaml_event_t *first_event); + +static int +yaml_parser_load_mapping(yaml_parser_t *parser, yaml_event_t *first_event); + +/* + * Load the next document of the stream. + */ + +YAML_DECLARE(int) +yaml_parser_load(yaml_parser_t *parser, yaml_document_t *document) +{ + yaml_event_t event; + + assert(parser); /* Non-NULL parser object is expected. */ + assert(document); /* Non-NULL document object is expected. */ + + memset(document, 0, sizeof(yaml_document_t)); + if (!STACK_INIT(parser, document->nodes, INITIAL_STACK_SIZE)) + goto error; + + if (!parser->stream_start_produced) { + if (!yaml_parser_parse(parser, &event)) goto error; + assert(event.type == YAML_STREAM_START_EVENT); + /* STREAM-START is expected. */ + } + + if (parser->stream_end_produced) { + return 1; + } + + if (!yaml_parser_parse(parser, &event)) goto error; + if (event.type == YAML_STREAM_END_EVENT) { + return 1; + } + + if (!STACK_INIT(parser, parser->aliases, INITIAL_STACK_SIZE)) + goto error; + + parser->document = document; + + if (!yaml_parser_load_document(parser, &event)) goto error; + + yaml_parser_delete_aliases(parser); + parser->document = NULL; + + return 1; + +error: + + yaml_parser_delete_aliases(parser); + yaml_document_delete(document); + parser->document = NULL; + + return 0; +} + +/* + * Set composer error. + */ + +static int +yaml_parser_set_composer_error(yaml_parser_t *parser, + const char *problem, yaml_mark_t problem_mark) +{ + parser->error = YAML_COMPOSER_ERROR; + parser->problem = problem; + parser->problem_mark = problem_mark; + + return 0; +} + +/* + * Set composer error with context. + */ + +static int +yaml_parser_set_composer_error_context(yaml_parser_t *parser, + const char *context, yaml_mark_t context_mark, + const char *problem, yaml_mark_t problem_mark) +{ + parser->error = YAML_COMPOSER_ERROR; + parser->context = context; + parser->context_mark = context_mark; + parser->problem = problem; + parser->problem_mark = problem_mark; + + return 0; +} + +/* + * Delete the stack of aliases. + */ + +static void +yaml_parser_delete_aliases(yaml_parser_t *parser) +{ + while (!STACK_EMPTY(parser, parser->aliases)) { + yaml_free(POP(parser, parser->aliases).anchor); + } + STACK_DEL(parser, parser->aliases); +} + +/* + * Compose a document object. + */ + +static int +yaml_parser_load_document(yaml_parser_t *parser, yaml_event_t *first_event) +{ + yaml_event_t event; + + assert(first_event->type == YAML_DOCUMENT_START_EVENT); + /* DOCUMENT-START is expected. */ + + parser->document->version_directive + = first_event->data.document_start.version_directive; + parser->document->tag_directives.start + = first_event->data.document_start.tag_directives.start; + parser->document->tag_directives.end + = first_event->data.document_start.tag_directives.end; + parser->document->start_implicit + = first_event->data.document_start.implicit; + parser->document->start_mark = first_event->start_mark; + + if (!yaml_parser_parse(parser, &event)) return 0; + + if (!yaml_parser_load_node(parser, &event)) return 0; + + if (!yaml_parser_parse(parser, &event)) return 0; + assert(event.type == YAML_DOCUMENT_END_EVENT); + /* DOCUMENT-END is expected. */ + + parser->document->end_implicit = event.data.document_end.implicit; + parser->document->end_mark = event.end_mark; + + return 1; +} + +/* + * Compose a node. + */ + +static int +yaml_parser_load_node(yaml_parser_t *parser, yaml_event_t *first_event) +{ + switch (first_event->type) { + case YAML_ALIAS_EVENT: + return yaml_parser_load_alias(parser, first_event); + case YAML_SCALAR_EVENT: + return yaml_parser_load_scalar(parser, first_event); + case YAML_SEQUENCE_START_EVENT: + return yaml_parser_load_sequence(parser, first_event); + case YAML_MAPPING_START_EVENT: + return yaml_parser_load_mapping(parser, first_event); + default: + assert(0); /* Could not happen. */ + return 0; + } + + return 0; +} + +/* + * Add an anchor. + */ + +static int +yaml_parser_register_anchor(yaml_parser_t *parser, + int index, yaml_char_t *anchor) +{ + yaml_alias_data_t data; + yaml_alias_data_t *alias_data; + + if (!anchor) return 1; + + data.anchor = anchor; + data.index = index; + data.mark = parser->document->nodes.start[index-1].start_mark; + + for (alias_data = parser->aliases.start; + alias_data != parser->aliases.top; alias_data ++) { + if (strcmp((char *)alias_data->anchor, (char *)anchor) == 0) { + yaml_free(anchor); + return yaml_parser_set_composer_error_context(parser, + "found duplicate anchor; first occurence", + alias_data->mark, "second occurence", data.mark); + } + } + + if (!PUSH(parser, parser->aliases, data)) { + yaml_free(anchor); + return 0; + } + + return 1; +} + +/* + * Compose a node corresponding to an alias. + */ + +static int +yaml_parser_load_alias(yaml_parser_t *parser, yaml_event_t *first_event) +{ + yaml_char_t *anchor = first_event->data.alias.anchor; + yaml_alias_data_t *alias_data; + + for (alias_data = parser->aliases.start; + alias_data != parser->aliases.top; alias_data ++) { + if (strcmp((char *)alias_data->anchor, (char *)anchor) == 0) { + yaml_free(anchor); + return alias_data->index; + } + } + + yaml_free(anchor); + return yaml_parser_set_composer_error(parser, "found undefined alias", + first_event->start_mark); +} + +/* + * Compose a scalar node. + */ + +static int +yaml_parser_load_scalar(yaml_parser_t *parser, yaml_event_t *first_event) +{ + yaml_node_t node; + int index; + yaml_char_t *tag = first_event->data.scalar.tag; + + if (!tag || strcmp((char *)tag, "!") == 0) { + yaml_free(tag); + tag = yaml_strdup((yaml_char_t *)YAML_DEFAULT_SCALAR_TAG); + if (!tag) goto error; + } + + SCALAR_NODE_INIT(node, tag, first_event->data.scalar.value, + first_event->data.scalar.length, first_event->data.scalar.style, + first_event->start_mark, first_event->end_mark); + + if (!PUSH(parser, parser->document->nodes, node)) goto error; + + index = parser->document->nodes.top - parser->document->nodes.start; + + if (!yaml_parser_register_anchor(parser, index, + first_event->data.scalar.anchor)) return 0; + + return index; + +error: + yaml_free(tag); + yaml_free(first_event->data.scalar.anchor); + yaml_free(first_event->data.scalar.value); + return 0; +} + +/* + * Compose a sequence node. + */ + +static int +yaml_parser_load_sequence(yaml_parser_t *parser, yaml_event_t *first_event) +{ + yaml_event_t event; + yaml_node_t node; + struct { + yaml_node_item_t *start; + yaml_node_item_t *end; + yaml_node_item_t *top; + } items = { NULL, NULL, NULL }; + int index, item_index; + yaml_char_t *tag = first_event->data.sequence_start.tag; + + if (!tag || strcmp((char *)tag, "!") == 0) { + yaml_free(tag); + tag = yaml_strdup((yaml_char_t *)YAML_DEFAULT_SEQUENCE_TAG); + if (!tag) goto error; + } + + if (!STACK_INIT(parser, items, INITIAL_STACK_SIZE)) goto error; + + SEQUENCE_NODE_INIT(node, tag, items.start, items.end, + first_event->data.sequence_start.style, + first_event->start_mark, first_event->end_mark); + + if (!PUSH(parser, parser->document->nodes, node)) goto error; + + index = parser->document->nodes.top - parser->document->nodes.start; + + if (!yaml_parser_register_anchor(parser, index, + first_event->data.sequence_start.anchor)) return 0; + + if (!yaml_parser_parse(parser, &event)) return 0; + + while (event.type != YAML_SEQUENCE_END_EVENT) { + item_index = yaml_parser_load_node(parser, &event); + if (!item_index) return 0; + if (!PUSH(parser, + parser->document->nodes.start[index-1].data.sequence.items, + item_index)) return 0; + if (!yaml_parser_parse(parser, &event)) return 0; + } + + parser->document->nodes.start[index-1].end_mark = event.end_mark; + + return index; + +error: + yaml_free(tag); + yaml_free(first_event->data.sequence_start.anchor); + return 0; +} + +/* + * Compose a mapping node. + */ + +static int +yaml_parser_load_mapping(yaml_parser_t *parser, yaml_event_t *first_event) +{ + yaml_event_t event; + yaml_node_t node; + struct { + yaml_node_pair_t *start; + yaml_node_pair_t *end; + yaml_node_pair_t *top; + } pairs = { NULL, NULL, NULL }; + int index; + yaml_node_pair_t pair; + yaml_char_t *tag = first_event->data.mapping_start.tag; + + if (!tag || strcmp((char *)tag, "!") == 0) { + yaml_free(tag); + tag = yaml_strdup((yaml_char_t *)YAML_DEFAULT_MAPPING_TAG); + if (!tag) goto error; + } + + if (!STACK_INIT(parser, pairs, INITIAL_STACK_SIZE)) goto error; + + MAPPING_NODE_INIT(node, tag, pairs.start, pairs.end, + first_event->data.mapping_start.style, + first_event->start_mark, first_event->end_mark); + + if (!PUSH(parser, parser->document->nodes, node)) goto error; + + index = parser->document->nodes.top - parser->document->nodes.start; + + if (!yaml_parser_register_anchor(parser, index, + first_event->data.mapping_start.anchor)) return 0; + + if (!yaml_parser_parse(parser, &event)) return 0; + + while (event.type != YAML_MAPPING_END_EVENT) { + pair.key = yaml_parser_load_node(parser, &event); + if (!pair.key) return 0; + if (!yaml_parser_parse(parser, &event)) return 0; + pair.value = yaml_parser_load_node(parser, &event); + if (!pair.value) return 0; + if (!PUSH(parser, + parser->document->nodes.start[index-1].data.mapping.pairs, + pair)) return 0; + if (!yaml_parser_parse(parser, &event)) return 0; + } + + parser->document->nodes.start[index-1].end_mark = event.end_mark; + + return index; + +error: + yaml_free(tag); + yaml_free(first_event->data.mapping_start.anchor); + return 0; +} + diff --git a/ext/psych/yaml/parser.c b/ext/psych/yaml/parser.c new file mode 100644 index 0000000000..eb2a2c792b --- /dev/null +++ b/ext/psych/yaml/parser.c @@ -0,0 +1,1374 @@ + +/* + * The parser implements the following grammar: + * + * stream ::= STREAM-START implicit_document? explicit_document* STREAM-END + * implicit_document ::= block_node DOCUMENT-END* + * explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END* + * block_node_or_indentless_sequence ::= + * ALIAS + * | properties (block_content | indentless_block_sequence)? + * | block_content + * | indentless_block_sequence + * block_node ::= ALIAS + * | properties block_content? + * | block_content + * flow_node ::= ALIAS + * | properties flow_content? + * | flow_content + * properties ::= TAG ANCHOR? | ANCHOR TAG? + * block_content ::= block_collection | flow_collection | SCALAR + * flow_content ::= flow_collection | SCALAR + * block_collection ::= block_sequence | block_mapping + * flow_collection ::= flow_sequence | flow_mapping + * block_sequence ::= BLOCK-SEQUENCE-START (BLOCK-ENTRY block_node?)* BLOCK-END + * indentless_sequence ::= (BLOCK-ENTRY block_node?)+ + * block_mapping ::= BLOCK-MAPPING_START + * ((KEY block_node_or_indentless_sequence?)? + * (VALUE block_node_or_indentless_sequence?)?)* + * BLOCK-END + * flow_sequence ::= FLOW-SEQUENCE-START + * (flow_sequence_entry FLOW-ENTRY)* + * flow_sequence_entry? + * FLOW-SEQUENCE-END + * flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)? + * flow_mapping ::= FLOW-MAPPING-START + * (flow_mapping_entry FLOW-ENTRY)* + * flow_mapping_entry? + * FLOW-MAPPING-END + * flow_mapping_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)? + */ + +#include "yaml_private.h" + +/* + * Peek the next token in the token queue. + */ + +#define PEEK_TOKEN(parser) \ + ((parser->token_available || yaml_parser_fetch_more_tokens(parser)) ? \ + parser->tokens.head : NULL) + +/* + * Remove the next token from the queue (must be called after PEEK_TOKEN). + */ + +#define SKIP_TOKEN(parser) \ + (parser->token_available = 0, \ + parser->tokens_parsed ++, \ + parser->stream_end_produced = \ + (parser->tokens.head->type == YAML_STREAM_END_TOKEN), \ + parser->tokens.head ++) + +/* + * Public API declarations. + */ + +YAML_DECLARE(int) +yaml_parser_parse(yaml_parser_t *parser, yaml_event_t *event); + +/* + * Error handling. + */ + +static int +yaml_parser_set_parser_error(yaml_parser_t *parser, + const char *problem, yaml_mark_t problem_mark); + +static int +yaml_parser_set_parser_error_context(yaml_parser_t *parser, + const char *context, yaml_mark_t context_mark, + const char *problem, yaml_mark_t problem_mark); + +/* + * State functions. + */ + +static int +yaml_parser_state_machine(yaml_parser_t *parser, yaml_event_t *event); + +static int +yaml_parser_parse_stream_start(yaml_parser_t *parser, yaml_event_t *event); + +static int +yaml_parser_parse_document_start(yaml_parser_t *parser, yaml_event_t *event, + int implicit); + +static int +yaml_parser_parse_document_content(yaml_parser_t *parser, yaml_event_t *event); + +static int +yaml_parser_parse_document_end(yaml_parser_t *parser, yaml_event_t *event); + +static int +yaml_parser_parse_node(yaml_parser_t *parser, yaml_event_t *event, + int block, int indentless_sequence); + +static int +yaml_parser_parse_block_sequence_entry(yaml_parser_t *parser, + yaml_event_t *event, int first); + +static int +yaml_parser_parse_indentless_sequence_entry(yaml_parser_t *parser, + yaml_event_t *event); + +static int +yaml_parser_parse_block_mapping_key(yaml_parser_t *parser, + yaml_event_t *event, int first); + +static int +yaml_parser_parse_block_mapping_value(yaml_parser_t *parser, + yaml_event_t *event); + +static int +yaml_parser_parse_flow_sequence_entry(yaml_parser_t *parser, + yaml_event_t *event, int first); + +static int +yaml_parser_parse_flow_sequence_entry_mapping_key(yaml_parser_t *parser, + yaml_event_t *event); + +static int +yaml_parser_parse_flow_sequence_entry_mapping_value(yaml_parser_t *parser, + yaml_event_t *event); + +static int +yaml_parser_parse_flow_sequence_entry_mapping_end(yaml_parser_t *parser, + yaml_event_t *event); + +static int +yaml_parser_parse_flow_mapping_key(yaml_parser_t *parser, + yaml_event_t *event, int first); + +static int +yaml_parser_parse_flow_mapping_value(yaml_parser_t *parser, + yaml_event_t *event, int empty); + +/* + * Utility functions. + */ + +static int +yaml_parser_process_empty_scalar(yaml_parser_t *parser, + yaml_event_t *event, yaml_mark_t mark); + +static int +yaml_parser_process_directives(yaml_parser_t *parser, + yaml_version_directive_t **version_directive_ref, + yaml_tag_directive_t **tag_directives_start_ref, + yaml_tag_directive_t **tag_directives_end_ref); + +static int +yaml_parser_append_tag_directive(yaml_parser_t *parser, + yaml_tag_directive_t value, int allow_duplicates, yaml_mark_t mark); + +/* + * Get the next event. + */ + +YAML_DECLARE(int) +yaml_parser_parse(yaml_parser_t *parser, yaml_event_t *event) +{ + assert(parser); /* Non-NULL parser object is expected. */ + assert(event); /* Non-NULL event object is expected. */ + + /* Erase the event object. */ + + memset(event, 0, sizeof(yaml_event_t)); + + /* No events after the end of the stream or error. */ + + if (parser->stream_end_produced || parser->error || + parser->state == YAML_PARSE_END_STATE) { + return 1; + } + + /* Generate the next event. */ + + return yaml_parser_state_machine(parser, event); +} + +/* + * Set parser error. + */ + +static int +yaml_parser_set_parser_error(yaml_parser_t *parser, + const char *problem, yaml_mark_t problem_mark) +{ + parser->error = YAML_PARSER_ERROR; + parser->problem = problem; + parser->problem_mark = problem_mark; + + return 0; +} + +static int +yaml_parser_set_parser_error_context(yaml_parser_t *parser, + const char *context, yaml_mark_t context_mark, + const char *problem, yaml_mark_t problem_mark) +{ + parser->error = YAML_PARSER_ERROR; + parser->context = context; + parser->context_mark = context_mark; + parser->problem = problem; + parser->problem_mark = problem_mark; + + return 0; +} + + +/* + * State dispatcher. + */ + +static int +yaml_parser_state_machine(yaml_parser_t *parser, yaml_event_t *event) +{ + switch (parser->state) + { + case YAML_PARSE_STREAM_START_STATE: + return yaml_parser_parse_stream_start(parser, event); + + case YAML_PARSE_IMPLICIT_DOCUMENT_START_STATE: + return yaml_parser_parse_document_start(parser, event, 1); + + case YAML_PARSE_DOCUMENT_START_STATE: + return yaml_parser_parse_document_start(parser, event, 0); + + case YAML_PARSE_DOCUMENT_CONTENT_STATE: + return yaml_parser_parse_document_content(parser, event); + + case YAML_PARSE_DOCUMENT_END_STATE: + return yaml_parser_parse_document_end(parser, event); + + case YAML_PARSE_BLOCK_NODE_STATE: + return yaml_parser_parse_node(parser, event, 1, 0); + + case YAML_PARSE_BLOCK_NODE_OR_INDENTLESS_SEQUENCE_STATE: + return yaml_parser_parse_node(parser, event, 1, 1); + + case YAML_PARSE_FLOW_NODE_STATE: + return yaml_parser_parse_node(parser, event, 0, 0); + + case YAML_PARSE_BLOCK_SEQUENCE_FIRST_ENTRY_STATE: + return yaml_parser_parse_block_sequence_entry(parser, event, 1); + + case YAML_PARSE_BLOCK_SEQUENCE_ENTRY_STATE: + return yaml_parser_parse_block_sequence_entry(parser, event, 0); + + case YAML_PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE: + return yaml_parser_parse_indentless_sequence_entry(parser, event); + + case YAML_PARSE_BLOCK_MAPPING_FIRST_KEY_STATE: + return yaml_parser_parse_block_mapping_key(parser, event, 1); + + case YAML_PARSE_BLOCK_MAPPING_KEY_STATE: + return yaml_parser_parse_block_mapping_key(parser, event, 0); + + case YAML_PARSE_BLOCK_MAPPING_VALUE_STATE: + return yaml_parser_parse_block_mapping_value(parser, event); + + case YAML_PARSE_FLOW_SEQUENCE_FIRST_ENTRY_STATE: + return yaml_parser_parse_flow_sequence_entry(parser, event, 1); + + case YAML_PARSE_FLOW_SEQUENCE_ENTRY_STATE: + return yaml_parser_parse_flow_sequence_entry(parser, event, 0); + + case YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_KEY_STATE: + return yaml_parser_parse_flow_sequence_entry_mapping_key(parser, event); + + case YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_VALUE_STATE: + return yaml_parser_parse_flow_sequence_entry_mapping_value(parser, event); + + case YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_END_STATE: + return yaml_parser_parse_flow_sequence_entry_mapping_end(parser, event); + + case YAML_PARSE_FLOW_MAPPING_FIRST_KEY_STATE: + return yaml_parser_parse_flow_mapping_key(parser, event, 1); + + case YAML_PARSE_FLOW_MAPPING_KEY_STATE: + return yaml_parser_parse_flow_mapping_key(parser, event, 0); + + case YAML_PARSE_FLOW_MAPPING_VALUE_STATE: + return yaml_parser_parse_flow_mapping_value(parser, event, 0); + + case YAML_PARSE_FLOW_MAPPING_EMPTY_VALUE_STATE: + return yaml_parser_parse_flow_mapping_value(parser, event, 1); + + default: + assert(1); /* Invalid state. */ + } + + return 0; +} + +/* + * Parse the production: + * stream ::= STREAM-START implicit_document? explicit_document* STREAM-END + * ************ + */ + +static int +yaml_parser_parse_stream_start(yaml_parser_t *parser, yaml_event_t *event) +{ + yaml_token_t *token; + + token = PEEK_TOKEN(parser); + if (!token) return 0; + + if (token->type != YAML_STREAM_START_TOKEN) { + return yaml_parser_set_parser_error(parser, + "did not find expected <stream-start>", token->start_mark); + } + + parser->state = YAML_PARSE_IMPLICIT_DOCUMENT_START_STATE; + STREAM_START_EVENT_INIT(*event, token->data.stream_start.encoding, + token->start_mark, token->start_mark); + SKIP_TOKEN(parser); + + return 1; +} + +/* + * Parse the productions: + * implicit_document ::= block_node DOCUMENT-END* + * * + * explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END* + * ************************* + */ + +static int +yaml_parser_parse_document_start(yaml_parser_t *parser, yaml_event_t *event, + int implicit) +{ + yaml_token_t *token; + yaml_version_directive_t *version_directive = NULL; + struct { + yaml_tag_directive_t *start; + yaml_tag_directive_t *end; + } tag_directives = { NULL, NULL }; + + token = PEEK_TOKEN(parser); + if (!token) return 0; + + /* Parse extra document end indicators. */ + + if (!implicit) + { + while (token->type == YAML_DOCUMENT_END_TOKEN) { + SKIP_TOKEN(parser); + token = PEEK_TOKEN(parser); + if (!token) return 0; + } + } + + /* Parse an implicit document. */ + + if (implicit && token->type != YAML_VERSION_DIRECTIVE_TOKEN && + token->type != YAML_TAG_DIRECTIVE_TOKEN && + token->type != YAML_DOCUMENT_START_TOKEN && + token->type != YAML_STREAM_END_TOKEN) + { + if (!yaml_parser_process_directives(parser, NULL, NULL, NULL)) + return 0; + if (!PUSH(parser, parser->states, YAML_PARSE_DOCUMENT_END_STATE)) + return 0; + parser->state = YAML_PARSE_BLOCK_NODE_STATE; + DOCUMENT_START_EVENT_INIT(*event, NULL, NULL, NULL, 1, + token->start_mark, token->start_mark); + return 1; + } + + /* Parse an explicit document. */ + + else if (token->type != YAML_STREAM_END_TOKEN) + { + yaml_mark_t start_mark, end_mark; + start_mark = token->start_mark; + if (!yaml_parser_process_directives(parser, &version_directive, + &tag_directives.start, &tag_directives.end)) + return 0; + token = PEEK_TOKEN(parser); + if (!token) goto error; + if (token->type != YAML_DOCUMENT_START_TOKEN) { + yaml_parser_set_parser_error(parser, + "did not find expected <document start>", token->start_mark); + goto error; + } + if (!PUSH(parser, parser->states, YAML_PARSE_DOCUMENT_END_STATE)) + goto error; + parser->state = YAML_PARSE_DOCUMENT_CONTENT_STATE; + end_mark = token->end_mark; + DOCUMENT_START_EVENT_INIT(*event, version_directive, + tag_directives.start, tag_directives.end, 0, + start_mark, end_mark); + SKIP_TOKEN(parser); + version_directive = NULL; + tag_directives.start = tag_directives.end = NULL; + return 1; + } + + /* Parse the stream end. */ + + else + { + parser->state = YAML_PARSE_END_STATE; + STREAM_END_EVENT_INIT(*event, token->start_mark, token->end_mark); + SKIP_TOKEN(parser); + return 1; + } + +error: + yaml_free(version_directive); + while (tag_directives.start != tag_directives.end) { + yaml_free(tag_directives.end[-1].handle); + yaml_free(tag_directives.end[-1].prefix); + tag_directives.end --; + } + yaml_free(tag_directives.start); + return 0; +} + +/* + * Parse the productions: + * explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END* + * *********** + */ + +static int +yaml_parser_parse_document_content(yaml_parser_t *parser, yaml_event_t *event) +{ + yaml_token_t *token; + + token = PEEK_TOKEN(parser); + if (!token) return 0; + + if (token->type == YAML_VERSION_DIRECTIVE_TOKEN || + token->type == YAML_TAG_DIRECTIVE_TOKEN || + token->type == YAML_DOCUMENT_START_TOKEN || + token->type == YAML_DOCUMENT_END_TOKEN || + token->type == YAML_STREAM_END_TOKEN) { + parser->state = POP(parser, parser->states); + return yaml_parser_process_empty_scalar(parser, event, + token->start_mark); + } + else { + return yaml_parser_parse_node(parser, event, 1, 0); + } +} + +/* + * Parse the productions: + * implicit_document ::= block_node DOCUMENT-END* + * ************* + * explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END* + * ************* + */ + +static int +yaml_parser_parse_document_end(yaml_parser_t *parser, yaml_event_t *event) +{ + yaml_token_t *token; + yaml_mark_t start_mark, end_mark; + int implicit = 1; + + token = PEEK_TOKEN(parser); + if (!token) return 0; + + start_mark = end_mark = token->start_mark; + + if (token->type == YAML_DOCUMENT_END_TOKEN) { + end_mark = token->end_mark; + SKIP_TOKEN(parser); + implicit = 0; + } + + while (!STACK_EMPTY(parser, parser->tag_directives)) { + yaml_tag_directive_t tag_directive = POP(parser, parser->tag_directives); + yaml_free(tag_directive.handle); + yaml_free(tag_directive.prefix); + } + + parser->state = YAML_PARSE_DOCUMENT_START_STATE; + DOCUMENT_END_EVENT_INIT(*event, implicit, start_mark, end_mark); + + return 1; +} + +/* + * Parse the productions: + * block_node_or_indentless_sequence ::= + * ALIAS + * ***** + * | properties (block_content | indentless_block_sequence)? + * ********** * + * | block_content | indentless_block_sequence + * * + * block_node ::= ALIAS + * ***** + * | properties block_content? + * ********** * + * | block_content + * * + * flow_node ::= ALIAS + * ***** + * | properties flow_content? + * ********** * + * | flow_content + * * + * properties ::= TAG ANCHOR? | ANCHOR TAG? + * ************************* + * block_content ::= block_collection | flow_collection | SCALAR + * ****** + * flow_content ::= flow_collection | SCALAR + * ****** + */ + +static int +yaml_parser_parse_node(yaml_parser_t *parser, yaml_event_t *event, + int block, int indentless_sequence) +{ + yaml_token_t *token; + yaml_char_t *anchor = NULL; + yaml_char_t *tag_handle = NULL; + yaml_char_t *tag_suffix = NULL; + yaml_char_t *tag = NULL; + yaml_mark_t start_mark, end_mark, tag_mark; + int implicit; + + token = PEEK_TOKEN(parser); + if (!token) return 0; + + if (token->type == YAML_ALIAS_TOKEN) + { + parser->state = POP(parser, parser->states); + ALIAS_EVENT_INIT(*event, token->data.alias.value, + token->start_mark, token->end_mark); + SKIP_TOKEN(parser); + return 1; + } + + else + { + start_mark = end_mark = token->start_mark; + + if (token->type == YAML_ANCHOR_TOKEN) + { + anchor = token->data.anchor.value; + start_mark = token->start_mark; + end_mark = token->end_mark; + SKIP_TOKEN(parser); + token = PEEK_TOKEN(parser); + if (!token) goto error; + if (token->type == YAML_TAG_TOKEN) + { + tag_handle = token->data.tag.handle; + tag_suffix = token->data.tag.suffix; + tag_mark = token->start_mark; + end_mark = token->end_mark; + SKIP_TOKEN(parser); + token = PEEK_TOKEN(parser); + if (!token) goto error; + } + } + else if (token->type == YAML_TAG_TOKEN) + { + tag_handle = token->data.tag.handle; + tag_suffix = token->data.tag.suffix; + start_mark = tag_mark = token->start_mark; + end_mark = token->end_mark; + SKIP_TOKEN(parser); + token = PEEK_TOKEN(parser); + if (!token) goto error; + if (token->type == YAML_ANCHOR_TOKEN) + { + anchor = token->data.anchor.value; + end_mark = token->end_mark; + SKIP_TOKEN(parser); + token = PEEK_TOKEN(parser); + if (!token) goto error; + } + } + + if (tag_handle) { + if (!*tag_handle) { + tag = tag_suffix; + yaml_free(tag_handle); + tag_handle = tag_suffix = NULL; + } + else { + yaml_tag_directive_t *tag_directive; + for (tag_directive = parser->tag_directives.start; + tag_directive != parser->tag_directives.top; + tag_directive ++) { + if (strcmp((char *)tag_directive->handle, (char *)tag_handle) == 0) { + size_t prefix_len = strlen((char *)tag_directive->prefix); + size_t suffix_len = strlen((char *)tag_suffix); + tag = yaml_malloc(prefix_len+suffix_len+1); + if (!tag) { + parser->error = YAML_MEMORY_ERROR; + goto error; + } + memcpy(tag, tag_directive->prefix, prefix_len); + memcpy(tag+prefix_len, tag_suffix, suffix_len); + tag[prefix_len+suffix_len] = '\0'; + yaml_free(tag_handle); + yaml_free(tag_suffix); + tag_handle = tag_suffix = NULL; + break; + } + } + if (!tag) { + yaml_parser_set_parser_error_context(parser, + "while parsing a node", start_mark, + "found undefined tag handle", tag_mark); + goto error; + } + } + } + + implicit = (!tag || !*tag); + if (indentless_sequence && token->type == YAML_BLOCK_ENTRY_TOKEN) { + end_mark = token->end_mark; + parser->state = YAML_PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE; + SEQUENCE_START_EVENT_INIT(*event, anchor, tag, implicit, + YAML_BLOCK_SEQUENCE_STYLE, start_mark, end_mark); + return 1; + } + else { + if (token->type == YAML_SCALAR_TOKEN) { + int plain_implicit = 0; + int quoted_implicit = 0; + end_mark = token->end_mark; + if ((token->data.scalar.style == YAML_PLAIN_SCALAR_STYLE && !tag) + || (tag && strcmp((char *)tag, "!") == 0)) { + plain_implicit = 1; + } + else if (!tag) { + quoted_implicit = 1; + } + parser->state = POP(parser, parser->states); + SCALAR_EVENT_INIT(*event, anchor, tag, + token->data.scalar.value, token->data.scalar.length, + plain_implicit, quoted_implicit, + token->data.scalar.style, start_mark, end_mark); + SKIP_TOKEN(parser); + return 1; + } + else if (token->type == YAML_FLOW_SEQUENCE_START_TOKEN) { + end_mark = token->end_mark; + parser->state = YAML_PARSE_FLOW_SEQUENCE_FIRST_ENTRY_STATE; + SEQUENCE_START_EVENT_INIT(*event, anchor, tag, implicit, + YAML_FLOW_SEQUENCE_STYLE, start_mark, end_mark); + return 1; + } + else if (token->type == YAML_FLOW_MAPPING_START_TOKEN) { + end_mark = token->end_mark; + parser->state = YAML_PARSE_FLOW_MAPPING_FIRST_KEY_STATE; + MAPPING_START_EVENT_INIT(*event, anchor, tag, implicit, + YAML_FLOW_MAPPING_STYLE, start_mark, end_mark); + return 1; + } + else if (block && token->type == YAML_BLOCK_SEQUENCE_START_TOKEN) { + end_mark = token->end_mark; + parser->state = YAML_PARSE_BLOCK_SEQUENCE_FIRST_ENTRY_STATE; + SEQUENCE_START_EVENT_INIT(*event, anchor, tag, implicit, + YAML_BLOCK_SEQUENCE_STYLE, start_mark, end_mark); + return 1; + } + else if (block && token->type == YAML_BLOCK_MAPPING_START_TOKEN) { + end_mark = token->end_mark; + parser->state = YAML_PARSE_BLOCK_MAPPING_FIRST_KEY_STATE; + MAPPING_START_EVENT_INIT(*event, anchor, tag, implicit, + YAML_BLOCK_MAPPING_STYLE, start_mark, end_mark); + return 1; + } + else if (anchor || tag) { + yaml_char_t *value = yaml_malloc(1); + if (!value) { + parser->error = YAML_MEMORY_ERROR; + goto error; + } + value[0] = '\0'; + parser->state = POP(parser, parser->states); + SCALAR_EVENT_INIT(*event, anchor, tag, value, 0, + implicit, 0, YAML_PLAIN_SCALAR_STYLE, + start_mark, end_mark); + return 1; + } + else { + yaml_parser_set_parser_error_context(parser, + (block ? "while parsing a block node" + : "while parsing a flow node"), start_mark, + "did not find expected node content", token->start_mark); + goto error; + } + } + } + +error: + yaml_free(anchor); + yaml_free(tag_handle); + yaml_free(tag_suffix); + yaml_free(tag); + + return 0; +} + +/* + * Parse the productions: + * block_sequence ::= BLOCK-SEQUENCE-START (BLOCK-ENTRY block_node?)* BLOCK-END + * ******************** *********** * ********* + */ + +static int +yaml_parser_parse_block_sequence_entry(yaml_parser_t *parser, + yaml_event_t *event, int first) +{ + yaml_token_t *token; + + if (first) { + token = PEEK_TOKEN(parser); + if (!PUSH(parser, parser->marks, token->start_mark)) + return 0; + SKIP_TOKEN(parser); + } + + token = PEEK_TOKEN(parser); + if (!token) return 0; + + if (token->type == YAML_BLOCK_ENTRY_TOKEN) + { + yaml_mark_t mark = token->end_mark; + SKIP_TOKEN(parser); + token = PEEK_TOKEN(parser); + if (!token) return 0; + if (token->type != YAML_BLOCK_ENTRY_TOKEN && + token->type != YAML_BLOCK_END_TOKEN) { + if (!PUSH(parser, parser->states, + YAML_PARSE_BLOCK_SEQUENCE_ENTRY_STATE)) + return 0; + return yaml_parser_parse_node(parser, event, 1, 0); + } + else { + parser->state = YAML_PARSE_BLOCK_SEQUENCE_ENTRY_STATE; + return yaml_parser_process_empty_scalar(parser, event, mark); + } + } + + else if (token->type == YAML_BLOCK_END_TOKEN) + { + yaml_mark_t dummy_mark; /* Used to eliminate a compiler warning. */ + parser->state = POP(parser, parser->states); + dummy_mark = POP(parser, parser->marks); + SEQUENCE_END_EVENT_INIT(*event, token->start_mark, token->end_mark); + SKIP_TOKEN(parser); + return 1; + } + + else + { + return yaml_parser_set_parser_error_context(parser, + "while parsing a block collection", POP(parser, parser->marks), + "did not find expected '-' indicator", token->start_mark); + } +} + +/* + * Parse the productions: + * indentless_sequence ::= (BLOCK-ENTRY block_node?)+ + * *********** * + */ + +static int +yaml_parser_parse_indentless_sequence_entry(yaml_parser_t *parser, + yaml_event_t *event) +{ + yaml_token_t *token; + + token = PEEK_TOKEN(parser); + if (!token) return 0; + + if (token->type == YAML_BLOCK_ENTRY_TOKEN) + { + yaml_mark_t mark = token->end_mark; + SKIP_TOKEN(parser); + token = PEEK_TOKEN(parser); + if (!token) return 0; + if (token->type != YAML_BLOCK_ENTRY_TOKEN && + token->type != YAML_KEY_TOKEN && + token->type != YAML_VALUE_TOKEN && + token->type != YAML_BLOCK_END_TOKEN) { + if (!PUSH(parser, parser->states, + YAML_PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE)) + return 0; + return yaml_parser_parse_node(parser, event, 1, 0); + } + else { + parser->state = YAML_PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE; + return yaml_parser_process_empty_scalar(parser, event, mark); + } + } + + else + { + parser->state = POP(parser, parser->states); + SEQUENCE_END_EVENT_INIT(*event, token->start_mark, token->start_mark); + return 1; + } +} + +/* + * Parse the productions: + * block_mapping ::= BLOCK-MAPPING_START + * ******************* + * ((KEY block_node_or_indentless_sequence?)? + * *** * + * (VALUE block_node_or_indentless_sequence?)?)* + * + * BLOCK-END + * ********* + */ + +static int +yaml_parser_parse_block_mapping_key(yaml_parser_t *parser, + yaml_event_t *event, int first) +{ + yaml_token_t *token; + + if (first) { + token = PEEK_TOKEN(parser); + if (!PUSH(parser, parser->marks, token->start_mark)) + return 0; + SKIP_TOKEN(parser); + } + + token = PEEK_TOKEN(parser); + if (!token) return 0; + + if (token->type == YAML_KEY_TOKEN) + { + yaml_mark_t mark = token->end_mark; + SKIP_TOKEN(parser); + token = PEEK_TOKEN(parser); + if (!token) return 0; + if (token->type != YAML_KEY_TOKEN && + token->type != YAML_VALUE_TOKEN && + token->type != YAML_BLOCK_END_TOKEN) { + if (!PUSH(parser, parser->states, + YAML_PARSE_BLOCK_MAPPING_VALUE_STATE)) + return 0; + return yaml_parser_parse_node(parser, event, 1, 1); + } + else { + parser->state = YAML_PARSE_BLOCK_MAPPING_VALUE_STATE; + return yaml_parser_process_empty_scalar(parser, event, mark); + } + } + + else if (token->type == YAML_BLOCK_END_TOKEN) + { + yaml_mark_t dummy_mark; /* Used to eliminate a compiler warning. */ + parser->state = POP(parser, parser->states); + dummy_mark = POP(parser, parser->marks); + MAPPING_END_EVENT_INIT(*event, token->start_mark, token->end_mark); + SKIP_TOKEN(parser); + return 1; + } + + else + { + return yaml_parser_set_parser_error_context(parser, + "while parsing a block mapping", POP(parser, parser->marks), + "did not find expected key", token->start_mark); + } +} + +/* + * Parse the productions: + * block_mapping ::= BLOCK-MAPPING_START + * + * ((KEY block_node_or_indentless_sequence?)? + * + * (VALUE block_node_or_indentless_sequence?)?)* + * ***** * + * BLOCK-END + * + */ + +static int +yaml_parser_parse_block_mapping_value(yaml_parser_t *parser, + yaml_event_t *event) +{ + yaml_token_t *token; + + token = PEEK_TOKEN(parser); + if (!token) return 0; + + if (token->type == YAML_VALUE_TOKEN) + { + yaml_mark_t mark = token->end_mark; + SKIP_TOKEN(parser); + token = PEEK_TOKEN(parser); + if (!token) return 0; + if (token->type != YAML_KEY_TOKEN && + token->type != YAML_VALUE_TOKEN && + token->type != YAML_BLOCK_END_TOKEN) { + if (!PUSH(parser, parser->states, + YAML_PARSE_BLOCK_MAPPING_KEY_STATE)) + return 0; + return yaml_parser_parse_node(parser, event, 1, 1); + } + else { + parser->state = YAML_PARSE_BLOCK_MAPPING_KEY_STATE; + return yaml_parser_process_empty_scalar(parser, event, mark); + } + } + + else + { + parser->state = YAML_PARSE_BLOCK_MAPPING_KEY_STATE; + return yaml_parser_process_empty_scalar(parser, event, token->start_mark); + } +} + +/* + * Parse the productions: + * flow_sequence ::= FLOW-SEQUENCE-START + * ******************* + * (flow_sequence_entry FLOW-ENTRY)* + * * ********** + * flow_sequence_entry? + * * + * FLOW-SEQUENCE-END + * ***************** + * flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)? + * * + */ + +static int +yaml_parser_parse_flow_sequence_entry(yaml_parser_t *parser, + yaml_event_t *event, int first) +{ + yaml_token_t *token; + yaml_mark_t dummy_mark; /* Used to eliminate a compiler warning. */ + + if (first) { + token = PEEK_TOKEN(parser); + if (!PUSH(parser, parser->marks, token->start_mark)) + return 0; + SKIP_TOKEN(parser); + } + + token = PEEK_TOKEN(parser); + if (!token) return 0; + + if (token->type != YAML_FLOW_SEQUENCE_END_TOKEN) + { + if (!first) { + if (token->type == YAML_FLOW_ENTRY_TOKEN) { + SKIP_TOKEN(parser); + token = PEEK_TOKEN(parser); + if (!token) return 0; + } + else { + return yaml_parser_set_parser_error_context(parser, + "while parsing a flow sequence", POP(parser, parser->marks), + "did not find expected ',' or ']'", token->start_mark); + } + } + + if (token->type == YAML_KEY_TOKEN) { + parser->state = YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_KEY_STATE; + MAPPING_START_EVENT_INIT(*event, NULL, NULL, + 1, YAML_FLOW_MAPPING_STYLE, + token->start_mark, token->end_mark); + SKIP_TOKEN(parser); + return 1; + } + + else if (token->type != YAML_FLOW_SEQUENCE_END_TOKEN) { + if (!PUSH(parser, parser->states, + YAML_PARSE_FLOW_SEQUENCE_ENTRY_STATE)) + return 0; + return yaml_parser_parse_node(parser, event, 0, 0); + } + } + + parser->state = POP(parser, parser->states); + dummy_mark = POP(parser, parser->marks); + SEQUENCE_END_EVENT_INIT(*event, token->start_mark, token->end_mark); + SKIP_TOKEN(parser); + return 1; +} + +/* + * Parse the productions: + * flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)? + * *** * + */ + +static int +yaml_parser_parse_flow_sequence_entry_mapping_key(yaml_parser_t *parser, + yaml_event_t *event) +{ + yaml_token_t *token; + + token = PEEK_TOKEN(parser); + if (!token) return 0; + + if (token->type != YAML_VALUE_TOKEN && token->type != YAML_FLOW_ENTRY_TOKEN + && token->type != YAML_FLOW_SEQUENCE_END_TOKEN) { + if (!PUSH(parser, parser->states, + YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_VALUE_STATE)) + return 0; + return yaml_parser_parse_node(parser, event, 0, 0); + } + else { + yaml_mark_t mark = token->end_mark; + SKIP_TOKEN(parser); + parser->state = YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_VALUE_STATE; + return yaml_parser_process_empty_scalar(parser, event, mark); + } +} + +/* + * Parse the productions: + * flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)? + * ***** * + */ + +static int +yaml_parser_parse_flow_sequence_entry_mapping_value(yaml_parser_t *parser, + yaml_event_t *event) +{ + yaml_token_t *token; + + token = PEEK_TOKEN(parser); + if (!token) return 0; + + if (token->type == YAML_VALUE_TOKEN) { + SKIP_TOKEN(parser); + token = PEEK_TOKEN(parser); + if (!token) return 0; + if (token->type != YAML_FLOW_ENTRY_TOKEN + && token->type != YAML_FLOW_SEQUENCE_END_TOKEN) { + if (!PUSH(parser, parser->states, + YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_END_STATE)) + return 0; + return yaml_parser_parse_node(parser, event, 0, 0); + } + } + parser->state = YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_END_STATE; + return yaml_parser_process_empty_scalar(parser, event, token->start_mark); +} + +/* + * Parse the productions: + * flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)? + * * + */ + +static int +yaml_parser_parse_flow_sequence_entry_mapping_end(yaml_parser_t *parser, + yaml_event_t *event) +{ + yaml_token_t *token; + + token = PEEK_TOKEN(parser); + if (!token) return 0; + + parser->state = YAML_PARSE_FLOW_SEQUENCE_ENTRY_STATE; + + MAPPING_END_EVENT_INIT(*event, token->start_mark, token->start_mark); + return 1; +} + +/* + * Parse the productions: + * flow_mapping ::= FLOW-MAPPING-START + * ****************** + * (flow_mapping_entry FLOW-ENTRY)* + * * ********** + * flow_mapping_entry? + * ****************** + * FLOW-MAPPING-END + * **************** + * flow_mapping_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)? + * * *** * + */ + +static int +yaml_parser_parse_flow_mapping_key(yaml_parser_t *parser, + yaml_event_t *event, int first) +{ + yaml_token_t *token; + yaml_mark_t dummy_mark; /* Used to eliminate a compiler warning. */ + + if (first) { + token = PEEK_TOKEN(parser); + if (!PUSH(parser, parser->marks, token->start_mark)) + return 0; + SKIP_TOKEN(parser); + } + + token = PEEK_TOKEN(parser); + if (!token) return 0; + + if (token->type != YAML_FLOW_MAPPING_END_TOKEN) + { + if (!first) { + if (token->type == YAML_FLOW_ENTRY_TOKEN) { + SKIP_TOKEN(parser); + token = PEEK_TOKEN(parser); + if (!token) return 0; + } + else { + return yaml_parser_set_parser_error_context(parser, + "while parsing a flow mapping", POP(parser, parser->marks), + "did not find expected ',' or '}'", token->start_mark); + } + } + + if (token->type == YAML_KEY_TOKEN) { + SKIP_TOKEN(parser); + token = PEEK_TOKEN(parser); + if (!token) return 0; + if (token->type != YAML_VALUE_TOKEN + && token->type != YAML_FLOW_ENTRY_TOKEN + && token->type != YAML_FLOW_MAPPING_END_TOKEN) { + if (!PUSH(parser, parser->states, + YAML_PARSE_FLOW_MAPPING_VALUE_STATE)) + return 0; + return yaml_parser_parse_node(parser, event, 0, 0); + } + else { + parser->state = YAML_PARSE_FLOW_MAPPING_VALUE_STATE; + return yaml_parser_process_empty_scalar(parser, event, + token->start_mark); + } + } + else if (token->type != YAML_FLOW_MAPPING_END_TOKEN) { + if (!PUSH(parser, parser->states, + YAML_PARSE_FLOW_MAPPING_EMPTY_VALUE_STATE)) + return 0; + return yaml_parser_parse_node(parser, event, 0, 0); + } + } + + parser->state = POP(parser, parser->states); + dummy_mark = POP(parser, parser->marks); + MAPPING_END_EVENT_INIT(*event, token->start_mark, token->end_mark); + SKIP_TOKEN(parser); + return 1; +} + +/* + * Parse the productions: + * flow_mapping_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)? + * * ***** * + */ + +static int +yaml_parser_parse_flow_mapping_value(yaml_parser_t *parser, + yaml_event_t *event, int empty) +{ + yaml_token_t *token; + + token = PEEK_TOKEN(parser); + if (!token) return 0; + + if (empty) { + parser->state = YAML_PARSE_FLOW_MAPPING_KEY_STATE; + return yaml_parser_process_empty_scalar(parser, event, + token->start_mark); + } + + if (token->type == YAML_VALUE_TOKEN) { + SKIP_TOKEN(parser); + token = PEEK_TOKEN(parser); + if (!token) return 0; + if (token->type != YAML_FLOW_ENTRY_TOKEN + && token->type != YAML_FLOW_MAPPING_END_TOKEN) { + if (!PUSH(parser, parser->states, + YAML_PARSE_FLOW_MAPPING_KEY_STATE)) + return 0; + return yaml_parser_parse_node(parser, event, 0, 0); + } + } + + parser->state = YAML_PARSE_FLOW_MAPPING_KEY_STATE; + return yaml_parser_process_empty_scalar(parser, event, token->start_mark); +} + +/* + * Generate an empty scalar event. + */ + +static int +yaml_parser_process_empty_scalar(yaml_parser_t *parser, yaml_event_t *event, + yaml_mark_t mark) +{ + yaml_char_t *value; + + value = yaml_malloc(1); + if (!value) { + parser->error = YAML_MEMORY_ERROR; + return 0; + } + value[0] = '\0'; + + SCALAR_EVENT_INIT(*event, NULL, NULL, value, 0, + 1, 0, YAML_PLAIN_SCALAR_STYLE, mark, mark); + + return 1; +} + +/* + * Parse directives. + */ + +static int +yaml_parser_process_directives(yaml_parser_t *parser, + yaml_version_directive_t **version_directive_ref, + yaml_tag_directive_t **tag_directives_start_ref, + yaml_tag_directive_t **tag_directives_end_ref) +{ + yaml_tag_directive_t default_tag_directives[] = { + {(yaml_char_t *)"!", (yaml_char_t *)"!"}, + {(yaml_char_t *)"!!", (yaml_char_t *)"tag:yaml.org,2002:"}, + {NULL, NULL} + }; + yaml_tag_directive_t *default_tag_directive; + yaml_version_directive_t *version_directive = NULL; + struct { + yaml_tag_directive_t *start; + yaml_tag_directive_t *end; + yaml_tag_directive_t *top; + } tag_directives = { NULL, NULL, NULL }; + yaml_token_t *token; + + if (!STACK_INIT(parser, tag_directives, INITIAL_STACK_SIZE)) + goto error; + + token = PEEK_TOKEN(parser); + if (!token) goto error; + + while (token->type == YAML_VERSION_DIRECTIVE_TOKEN || + token->type == YAML_TAG_DIRECTIVE_TOKEN) + { + if (token->type == YAML_VERSION_DIRECTIVE_TOKEN) { + if (version_directive) { + yaml_parser_set_parser_error(parser, + "found duplicate %YAML directive", token->start_mark); + goto error; + } + if (token->data.version_directive.major != 1 + || token->data.version_directive.minor != 1) { + yaml_parser_set_parser_error(parser, + "found incompatible YAML document", token->start_mark); + goto error; + } + version_directive = yaml_malloc(sizeof(yaml_version_directive_t)); + if (!version_directive) { + parser->error = YAML_MEMORY_ERROR; + goto error; + } + version_directive->major = token->data.version_directive.major; + version_directive->minor = token->data.version_directive.minor; + } + + else if (token->type == YAML_TAG_DIRECTIVE_TOKEN) { + yaml_tag_directive_t value; + value.handle = token->data.tag_directive.handle; + value.prefix = token->data.tag_directive.prefix; + + if (!yaml_parser_append_tag_directive(parser, value, 0, + token->start_mark)) + goto error; + if (!PUSH(parser, tag_directives, value)) + goto error; + } + + SKIP_TOKEN(parser); + token = PEEK_TOKEN(parser); + if (!token) goto error; + } + + for (default_tag_directive = default_tag_directives; + default_tag_directive->handle; default_tag_directive++) { + if (!yaml_parser_append_tag_directive(parser, *default_tag_directive, 1, + token->start_mark)) + goto error; + } + + if (version_directive_ref) { + *version_directive_ref = version_directive; + } + if (tag_directives_start_ref) { + if (STACK_EMPTY(parser, tag_directives)) { + *tag_directives_start_ref = *tag_directives_end_ref = NULL; + STACK_DEL(parser, tag_directives); + } + else { + *tag_directives_start_ref = tag_directives.start; + *tag_directives_end_ref = tag_directives.top; + } + } + else { + STACK_DEL(parser, tag_directives); + } + + return 1; + +error: + yaml_free(version_directive); + while (!STACK_EMPTY(parser, tag_directives)) { + yaml_tag_directive_t tag_directive = POP(parser, tag_directives); + yaml_free(tag_directive.handle); + yaml_free(tag_directive.prefix); + } + STACK_DEL(parser, tag_directives); + return 0; +} + +/* + * Append a tag directive to the directives stack. + */ + +static int +yaml_parser_append_tag_directive(yaml_parser_t *parser, + yaml_tag_directive_t value, int allow_duplicates, yaml_mark_t mark) +{ + yaml_tag_directive_t *tag_directive; + yaml_tag_directive_t copy = { NULL, NULL }; + + for (tag_directive = parser->tag_directives.start; + tag_directive != parser->tag_directives.top; tag_directive ++) { + if (strcmp((char *)value.handle, (char *)tag_directive->handle) == 0) { + if (allow_duplicates) + return 1; + return yaml_parser_set_parser_error(parser, + "found duplicate %TAG directive", mark); + } + } + + copy.handle = yaml_strdup(value.handle); + copy.prefix = yaml_strdup(value.prefix); + if (!copy.handle || !copy.prefix) { + parser->error = YAML_MEMORY_ERROR; + goto error; + } + + if (!PUSH(parser, parser->tag_directives, copy)) + goto error; + + return 1; + +error: + yaml_free(copy.handle); + yaml_free(copy.prefix); + return 0; +} + diff --git a/ext/psych/yaml/reader.c b/ext/psych/yaml/reader.c new file mode 100644 index 0000000000..829e32da55 --- /dev/null +++ b/ext/psych/yaml/reader.c @@ -0,0 +1,465 @@ + +#include "yaml_private.h" + +/* + * Declarations. + */ + +static int +yaml_parser_set_reader_error(yaml_parser_t *parser, const char *problem, + size_t offset, int value); + +static int +yaml_parser_update_raw_buffer(yaml_parser_t *parser); + +static int +yaml_parser_determine_encoding(yaml_parser_t *parser); + +YAML_DECLARE(int) +yaml_parser_update_buffer(yaml_parser_t *parser, size_t length); + +/* + * Set the reader error and return 0. + */ + +static int +yaml_parser_set_reader_error(yaml_parser_t *parser, const char *problem, + size_t offset, int value) +{ + parser->error = YAML_READER_ERROR; + parser->problem = problem; + parser->problem_offset = offset; + parser->problem_value = value; + + return 0; +} + +/* + * Byte order marks. + */ + +#define BOM_UTF8 "\xef\xbb\xbf" +#define BOM_UTF16LE "\xff\xfe" +#define BOM_UTF16BE "\xfe\xff" + +/* + * Determine the input stream encoding by checking the BOM symbol. If no BOM is + * found, the UTF-8 encoding is assumed. Return 1 on success, 0 on failure. + */ + +static int +yaml_parser_determine_encoding(yaml_parser_t *parser) +{ + /* Ensure that we had enough bytes in the raw buffer. */ + + while (!parser->eof + && parser->raw_buffer.last - parser->raw_buffer.pointer < 3) { + if (!yaml_parser_update_raw_buffer(parser)) { + return 0; + } + } + + /* Determine the encoding. */ + + if (parser->raw_buffer.last - parser->raw_buffer.pointer >= 2 + && !memcmp(parser->raw_buffer.pointer, BOM_UTF16LE, 2)) { + parser->encoding = YAML_UTF16LE_ENCODING; + parser->raw_buffer.pointer += 2; + parser->offset += 2; + } + else if (parser->raw_buffer.last - parser->raw_buffer.pointer >= 2 + && !memcmp(parser->raw_buffer.pointer, BOM_UTF16BE, 2)) { + parser->encoding = YAML_UTF16BE_ENCODING; + parser->raw_buffer.pointer += 2; + parser->offset += 2; + } + else if (parser->raw_buffer.last - parser->raw_buffer.pointer >= 3 + && !memcmp(parser->raw_buffer.pointer, BOM_UTF8, 3)) { + parser->encoding = YAML_UTF8_ENCODING; + parser->raw_buffer.pointer += 3; + parser->offset += 3; + } + else { + parser->encoding = YAML_UTF8_ENCODING; + } + + return 1; +} + +/* + * Update the raw buffer. + */ + +static int +yaml_parser_update_raw_buffer(yaml_parser_t *parser) +{ + size_t size_read = 0; + + /* Return if the raw buffer is full. */ + + if (parser->raw_buffer.start == parser->raw_buffer.pointer + && parser->raw_buffer.last == parser->raw_buffer.end) + return 1; + + /* Return on EOF. */ + + if (parser->eof) return 1; + + /* Move the remaining bytes in the raw buffer to the beginning. */ + + if (parser->raw_buffer.start < parser->raw_buffer.pointer + && parser->raw_buffer.pointer < parser->raw_buffer.last) { + memmove(parser->raw_buffer.start, parser->raw_buffer.pointer, + parser->raw_buffer.last - parser->raw_buffer.pointer); + } + parser->raw_buffer.last -= + parser->raw_buffer.pointer - parser->raw_buffer.start; + parser->raw_buffer.pointer = parser->raw_buffer.start; + + /* Call the read handler to fill the buffer. */ + + if (!parser->read_handler(parser->read_handler_data, parser->raw_buffer.last, + parser->raw_buffer.end - parser->raw_buffer.last, &size_read)) { + return yaml_parser_set_reader_error(parser, "input error", + parser->offset, -1); + } + parser->raw_buffer.last += size_read; + if (!size_read) { + parser->eof = 1; + } + + return 1; +} + +/* + * Ensure that the buffer contains at least `length` characters. + * Return 1 on success, 0 on failure. + * + * The length is supposed to be significantly less that the buffer size. + */ + +YAML_DECLARE(int) +yaml_parser_update_buffer(yaml_parser_t *parser, size_t length) +{ + int first = 1; + + assert(parser->read_handler); /* Read handler must be set. */ + + /* If the EOF flag is set and the raw buffer is empty, do nothing. */ + + if (parser->eof && parser->raw_buffer.pointer == parser->raw_buffer.last) + return 1; + + /* Return if the buffer contains enough characters. */ + + if (parser->unread >= length) + return 1; + + /* Determine the input encoding if it is not known yet. */ + + if (!parser->encoding) { + if (!yaml_parser_determine_encoding(parser)) + return 0; + } + + /* Move the unread characters to the beginning of the buffer. */ + + if (parser->buffer.start < parser->buffer.pointer + && parser->buffer.pointer < parser->buffer.last) { + size_t size = parser->buffer.last - parser->buffer.pointer; + memmove(parser->buffer.start, parser->buffer.pointer, size); + parser->buffer.pointer = parser->buffer.start; + parser->buffer.last = parser->buffer.start + size; + } + else if (parser->buffer.pointer == parser->buffer.last) { + parser->buffer.pointer = parser->buffer.start; + parser->buffer.last = parser->buffer.start; + } + + /* Fill the buffer until it has enough characters. */ + + while (parser->unread < length) + { + /* Fill the raw buffer if necessary. */ + + if (!first || parser->raw_buffer.pointer == parser->raw_buffer.last) { + if (!yaml_parser_update_raw_buffer(parser)) return 0; + } + first = 0; + + /* Decode the raw buffer. */ + + while (parser->raw_buffer.pointer != parser->raw_buffer.last) + { + unsigned int value = 0, value2 = 0; + int incomplete = 0; + unsigned char octet; + unsigned int width = 0; + int low, high; + size_t k; + size_t raw_unread = parser->raw_buffer.last - parser->raw_buffer.pointer; + + /* Decode the next character. */ + + switch (parser->encoding) + { + case YAML_UTF8_ENCODING: + + /* + * Decode a UTF-8 character. Check RFC 3629 + * (http://www.ietf.org/rfc/rfc3629.txt) for more details. + * + * The following table (taken from the RFC) is used for + * decoding. + * + * Char. number range | UTF-8 octet sequence + * (hexadecimal) | (binary) + * --------------------+------------------------------------ + * 0000 0000-0000 007F | 0xxxxxxx + * 0000 0080-0000 07FF | 110xxxxx 10xxxxxx + * 0000 0800-0000 FFFF | 1110xxxx 10xxxxxx 10xxxxxx + * 0001 0000-0010 FFFF | 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx + * + * Additionally, the characters in the range 0xD800-0xDFFF + * are prohibited as they are reserved for use with UTF-16 + * surrogate pairs. + */ + + /* Determine the length of the UTF-8 sequence. */ + + octet = parser->raw_buffer.pointer[0]; + width = (octet & 0x80) == 0x00 ? 1 : + (octet & 0xE0) == 0xC0 ? 2 : + (octet & 0xF0) == 0xE0 ? 3 : + (octet & 0xF8) == 0xF0 ? 4 : 0; + + /* Check if the leading octet is valid. */ + + if (!width) + return yaml_parser_set_reader_error(parser, + "invalid leading UTF-8 octet", + parser->offset, octet); + + /* Check if the raw buffer contains an incomplete character. */ + + if (width > raw_unread) { + if (parser->eof) { + return yaml_parser_set_reader_error(parser, + "incomplete UTF-8 octet sequence", + parser->offset, -1); + } + incomplete = 1; + break; + } + + /* Decode the leading octet. */ + + value = (octet & 0x80) == 0x00 ? octet & 0x7F : + (octet & 0xE0) == 0xC0 ? octet & 0x1F : + (octet & 0xF0) == 0xE0 ? octet & 0x0F : + (octet & 0xF8) == 0xF0 ? octet & 0x07 : 0; + + /* Check and decode the trailing octets. */ + + for (k = 1; k < width; k ++) + { + octet = parser->raw_buffer.pointer[k]; + + /* Check if the octet is valid. */ + + if ((octet & 0xC0) != 0x80) + return yaml_parser_set_reader_error(parser, + "invalid trailing UTF-8 octet", + parser->offset+k, octet); + + /* Decode the octet. */ + + value = (value << 6) + (octet & 0x3F); + } + + /* Check the length of the sequence against the value. */ + + if (!((width == 1) || + (width == 2 && value >= 0x80) || + (width == 3 && value >= 0x800) || + (width == 4 && value >= 0x10000))) + return yaml_parser_set_reader_error(parser, + "invalid length of a UTF-8 sequence", + parser->offset, -1); + + /* Check the range of the value. */ + + if ((value >= 0xD800 && value <= 0xDFFF) || value > 0x10FFFF) + return yaml_parser_set_reader_error(parser, + "invalid Unicode character", + parser->offset, value); + + break; + + case YAML_UTF16LE_ENCODING: + case YAML_UTF16BE_ENCODING: + + low = (parser->encoding == YAML_UTF16LE_ENCODING ? 0 : 1); + high = (parser->encoding == YAML_UTF16LE_ENCODING ? 1 : 0); + + /* + * The UTF-16 encoding is not as simple as one might + * naively think. Check RFC 2781 + * (http://www.ietf.org/rfc/rfc2781.txt). + * + * Normally, two subsequent bytes describe a Unicode + * character. However a special technique (called a + * surrogate pair) is used for specifying character + * values larger than 0xFFFF. + * + * A surrogate pair consists of two pseudo-characters: + * high surrogate area (0xD800-0xDBFF) + * low surrogate area (0xDC00-0xDFFF) + * + * The following formulas are used for decoding + * and encoding characters using surrogate pairs: + * + * U = U' + 0x10000 (0x01 00 00 <= U <= 0x10 FF FF) + * U' = yyyyyyyyyyxxxxxxxxxx (0 <= U' <= 0x0F FF FF) + * W1 = 110110yyyyyyyyyy + * W2 = 110111xxxxxxxxxx + * + * where U is the character value, W1 is the high surrogate + * area, W2 is the low surrogate area. + */ + + /* Check for incomplete UTF-16 character. */ + + if (raw_unread < 2) { + if (parser->eof) { + return yaml_parser_set_reader_error(parser, + "incomplete UTF-16 character", + parser->offset, -1); + } + incomplete = 1; + break; + } + + /* Get the character. */ + + value = parser->raw_buffer.pointer[low] + + (parser->raw_buffer.pointer[high] << 8); + + /* Check for unexpected low surrogate area. */ + + if ((value & 0xFC00) == 0xDC00) + return yaml_parser_set_reader_error(parser, + "unexpected low surrogate area", + parser->offset, value); + + /* Check for a high surrogate area. */ + + if ((value & 0xFC00) == 0xD800) { + + width = 4; + + /* Check for incomplete surrogate pair. */ + + if (raw_unread < 4) { + if (parser->eof) { + return yaml_parser_set_reader_error(parser, + "incomplete UTF-16 surrogate pair", + parser->offset, -1); + } + incomplete = 1; + break; + } + + /* Get the next character. */ + + value2 = parser->raw_buffer.pointer[low+2] + + (parser->raw_buffer.pointer[high+2] << 8); + + /* Check for a low surrogate area. */ + + if ((value2 & 0xFC00) != 0xDC00) + return yaml_parser_set_reader_error(parser, + "expected low surrogate area", + parser->offset+2, value2); + + /* Generate the value of the surrogate pair. */ + + value = 0x10000 + ((value & 0x3FF) << 10) + (value2 & 0x3FF); + } + + else { + width = 2; + } + + break; + + default: + assert(1); /* Impossible. */ + } + + /* Check if the raw buffer contains enough bytes to form a character. */ + + if (incomplete) break; + + /* + * Check if the character is in the allowed range: + * #x9 | #xA | #xD | [#x20-#x7E] (8 bit) + * | #x85 | [#xA0-#xD7FF] | [#xE000-#xFFFD] (16 bit) + * | [#x10000-#x10FFFF] (32 bit) + */ + + if (! (value == 0x09 || value == 0x0A || value == 0x0D + || (value >= 0x20 && value <= 0x7E) + || (value == 0x85) || (value >= 0xA0 && value <= 0xD7FF) + || (value >= 0xE000 && value <= 0xFFFD) + || (value >= 0x10000 && value <= 0x10FFFF))) + return yaml_parser_set_reader_error(parser, + "control characters are not allowed", + parser->offset, value); + + /* Move the raw pointers. */ + + parser->raw_buffer.pointer += width; + parser->offset += width; + + /* Finally put the character into the buffer. */ + + /* 0000 0000-0000 007F -> 0xxxxxxx */ + if (value <= 0x7F) { + *(parser->buffer.last++) = value; + } + /* 0000 0080-0000 07FF -> 110xxxxx 10xxxxxx */ + else if (value <= 0x7FF) { + *(parser->buffer.last++) = 0xC0 + (value >> 6); + *(parser->buffer.last++) = 0x80 + (value & 0x3F); + } + /* 0000 0800-0000 FFFF -> 1110xxxx 10xxxxxx 10xxxxxx */ + else if (value <= 0xFFFF) { + *(parser->buffer.last++) = 0xE0 + (value >> 12); + *(parser->buffer.last++) = 0x80 + ((value >> 6) & 0x3F); + *(parser->buffer.last++) = 0x80 + (value & 0x3F); + } + /* 0001 0000-0010 FFFF -> 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */ + else { + *(parser->buffer.last++) = 0xF0 + (value >> 18); + *(parser->buffer.last++) = 0x80 + ((value >> 12) & 0x3F); + *(parser->buffer.last++) = 0x80 + ((value >> 6) & 0x3F); + *(parser->buffer.last++) = 0x80 + (value & 0x3F); + } + + parser->unread ++; + } + + /* On EOF, put NUL into the buffer and return. */ + + if (parser->eof) { + *(parser->buffer.last++) = '\0'; + parser->unread ++; + return 1; + } + + } + + return 1; +} + diff --git a/ext/psych/yaml/scanner.c b/ext/psych/yaml/scanner.c new file mode 100644 index 0000000000..a2e8619264 --- /dev/null +++ b/ext/psych/yaml/scanner.c @@ -0,0 +1,3570 @@ + +/* + * Introduction + * ************ + * + * The following notes assume that you are familiar with the YAML specification + * (http://yaml.org/spec/cvs/current.html). We mostly follow it, although in + * some cases we are less restrictive that it requires. + * + * The process of transforming a YAML stream into a sequence of events is + * divided on two steps: Scanning and Parsing. + * + * The Scanner transforms the input stream into a sequence of tokens, while the + * parser transform the sequence of tokens produced by the Scanner into a + * sequence of parsing events. + * + * The Scanner is rather clever and complicated. The Parser, on the contrary, + * is a straightforward implementation of a recursive-descendant parser (or, + * LL(1) parser, as it is usually called). + * + * Actually there are two issues of Scanning that might be called "clever", the + * rest is quite straightforward. The issues are "block collection start" and + * "simple keys". Both issues are explained below in details. + * + * Here the Scanning step is explained and implemented. We start with the list + * of all the tokens produced by the Scanner together with short descriptions. + * + * Now, tokens: + * + * STREAM-START(encoding) # The stream start. + * STREAM-END # The stream end. + * VERSION-DIRECTIVE(major,minor) # The '%YAML' directive. + * TAG-DIRECTIVE(handle,prefix) # The '%TAG' directive. + * DOCUMENT-START # '---' + * DOCUMENT-END # '...' + * BLOCK-SEQUENCE-START # Indentation increase denoting a block + * BLOCK-MAPPING-START # sequence or a block mapping. + * BLOCK-END # Indentation decrease. + * FLOW-SEQUENCE-START # '[' + * FLOW-SEQUENCE-END # ']' + * BLOCK-SEQUENCE-START # '{' + * BLOCK-SEQUENCE-END # '}' + * BLOCK-ENTRY # '-' + * FLOW-ENTRY # ',' + * KEY # '?' or nothing (simple keys). + * VALUE # ':' + * ALIAS(anchor) # '*anchor' + * ANCHOR(anchor) # '&anchor' + * TAG(handle,suffix) # '!handle!suffix' + * SCALAR(value,style) # A scalar. + * + * The following two tokens are "virtual" tokens denoting the beginning and the + * end of the stream: + * + * STREAM-START(encoding) + * STREAM-END + * + * We pass the information about the input stream encoding with the + * STREAM-START token. + * + * The next two tokens are responsible for tags: + * + * VERSION-DIRECTIVE(major,minor) + * TAG-DIRECTIVE(handle,prefix) + * + * Example: + * + * %YAML 1.1 + * %TAG ! !foo + * %TAG !yaml! tag:yaml.org,2002: + * --- + * + * The correspoding sequence of tokens: + * + * STREAM-START(utf-8) + * VERSION-DIRECTIVE(1,1) + * TAG-DIRECTIVE("!","!foo") + * TAG-DIRECTIVE("!yaml","tag:yaml.org,2002:") + * DOCUMENT-START + * STREAM-END + * + * Note that the VERSION-DIRECTIVE and TAG-DIRECTIVE tokens occupy a whole + * line. + * + * The document start and end indicators are represented by: + * + * DOCUMENT-START + * DOCUMENT-END + * + * Note that if a YAML stream contains an implicit document (without '---' + * and '...' indicators), no DOCUMENT-START and DOCUMENT-END tokens will be + * produced. + * + * In the following examples, we present whole documents together with the + * produced tokens. + * + * 1. An implicit document: + * + * 'a scalar' + * + * Tokens: + * + * STREAM-START(utf-8) + * SCALAR("a scalar",single-quoted) + * STREAM-END + * + * 2. An explicit document: + * + * --- + * 'a scalar' + * ... + * + * Tokens: + * + * STREAM-START(utf-8) + * DOCUMENT-START + * SCALAR("a scalar",single-quoted) + * DOCUMENT-END + * STREAM-END + * + * 3. Several documents in a stream: + * + * 'a scalar' + * --- + * 'another scalar' + * --- + * 'yet another scalar' + * + * Tokens: + * + * STREAM-START(utf-8) + * SCALAR("a scalar",single-quoted) + * DOCUMENT-START + * SCALAR("another scalar",single-quoted) + * DOCUMENT-START + * SCALAR("yet another scalar",single-quoted) + * STREAM-END + * + * We have already introduced the SCALAR token above. The following tokens are + * used to describe aliases, anchors, tag, and scalars: + * + * ALIAS(anchor) + * ANCHOR(anchor) + * TAG(handle,suffix) + * SCALAR(value,style) + * + * The following series of examples illustrate the usage of these tokens: + * + * 1. A recursive sequence: + * + * &A [ *A ] + * + * Tokens: + * + * STREAM-START(utf-8) + * ANCHOR("A") + * FLOW-SEQUENCE-START + * ALIAS("A") + * FLOW-SEQUENCE-END + * STREAM-END + * + * 2. A tagged scalar: + * + * !!float "3.14" # A good approximation. + * + * Tokens: + * + * STREAM-START(utf-8) + * TAG("!!","float") + * SCALAR("3.14",double-quoted) + * STREAM-END + * + * 3. Various scalar styles: + * + * --- # Implicit empty plain scalars do not produce tokens. + * --- a plain scalar + * --- 'a single-quoted scalar' + * --- "a double-quoted scalar" + * --- |- + * a literal scalar + * --- >- + * a folded + * scalar + * + * Tokens: + * + * STREAM-START(utf-8) + * DOCUMENT-START + * DOCUMENT-START + * SCALAR("a plain scalar",plain) + * DOCUMENT-START + * SCALAR("a single-quoted scalar",single-quoted) + * DOCUMENT-START + * SCALAR("a double-quoted scalar",double-quoted) + * DOCUMENT-START + * SCALAR("a literal scalar",literal) + * DOCUMENT-START + * SCALAR("a folded scalar",folded) + * STREAM-END + * + * Now it's time to review collection-related tokens. We will start with + * flow collections: + * + * FLOW-SEQUENCE-START + * FLOW-SEQUENCE-END + * FLOW-MAPPING-START + * FLOW-MAPPING-END + * FLOW-ENTRY + * KEY + * VALUE + * + * The tokens FLOW-SEQUENCE-START, FLOW-SEQUENCE-END, FLOW-MAPPING-START, and + * FLOW-MAPPING-END represent the indicators '[', ']', '{', and '}' + * correspondingly. FLOW-ENTRY represent the ',' indicator. Finally the + * indicators '?' and ':', which are used for denoting mapping keys and values, + * are represented by the KEY and VALUE tokens. + * + * The following examples show flow collections: + * + * 1. A flow sequence: + * + * [item 1, item 2, item 3] + * + * Tokens: + * + * STREAM-START(utf-8) + * FLOW-SEQUENCE-START + * SCALAR("item 1",plain) + * FLOW-ENTRY + * SCALAR("item 2",plain) + * FLOW-ENTRY + * SCALAR("item 3",plain) + * FLOW-SEQUENCE-END + * STREAM-END + * + * 2. A flow mapping: + * + * { + * a simple key: a value, # Note that the KEY token is produced. + * ? a complex key: another value, + * } + * + * Tokens: + * + * STREAM-START(utf-8) + * FLOW-MAPPING-START + * KEY + * SCALAR("a simple key",plain) + * VALUE + * SCALAR("a value",plain) + * FLOW-ENTRY + * KEY + * SCALAR("a complex key",plain) + * VALUE + * SCALAR("another value",plain) + * FLOW-ENTRY + * FLOW-MAPPING-END + * STREAM-END + * + * A simple key is a key which is not denoted by the '?' indicator. Note that + * the Scanner still produce the KEY token whenever it encounters a simple key. + * + * For scanning block collections, the following tokens are used (note that we + * repeat KEY and VALUE here): + * + * BLOCK-SEQUENCE-START + * BLOCK-MAPPING-START + * BLOCK-END + * BLOCK-ENTRY + * KEY + * VALUE + * + * The tokens BLOCK-SEQUENCE-START and BLOCK-MAPPING-START denote indentation + * increase that precedes a block collection (cf. the INDENT token in Python). + * The token BLOCK-END denote indentation decrease that ends a block collection + * (cf. the DEDENT token in Python). However YAML has some syntax pecularities + * that makes detections of these tokens more complex. + * + * The tokens BLOCK-ENTRY, KEY, and VALUE are used to represent the indicators + * '-', '?', and ':' correspondingly. + * + * The following examples show how the tokens BLOCK-SEQUENCE-START, + * BLOCK-MAPPING-START, and BLOCK-END are emitted by the Scanner: + * + * 1. Block sequences: + * + * - item 1 + * - item 2 + * - + * - item 3.1 + * - item 3.2 + * - + * key 1: value 1 + * key 2: value 2 + * + * Tokens: + * + * STREAM-START(utf-8) + * BLOCK-SEQUENCE-START + * BLOCK-ENTRY + * SCALAR("item 1",plain) + * BLOCK-ENTRY + * SCALAR("item 2",plain) + * BLOCK-ENTRY + * BLOCK-SEQUENCE-START + * BLOCK-ENTRY + * SCALAR("item 3.1",plain) + * BLOCK-ENTRY + * SCALAR("item 3.2",plain) + * BLOCK-END + * BLOCK-ENTRY + * BLOCK-MAPPING-START + * KEY + * SCALAR("key 1",plain) + * VALUE + * SCALAR("value 1",plain) + * KEY + * SCALAR("key 2",plain) + * VALUE + * SCALAR("value 2",plain) + * BLOCK-END + * BLOCK-END + * STREAM-END + * + * 2. Block mappings: + * + * a simple key: a value # The KEY token is produced here. + * ? a complex key + * : another value + * a mapping: + * key 1: value 1 + * key 2: value 2 + * a sequence: + * - item 1 + * - item 2 + * + * Tokens: + * + * STREAM-START(utf-8) + * BLOCK-MAPPING-START + * KEY + * SCALAR("a simple key",plain) + * VALUE + * SCALAR("a value",plain) + * KEY + * SCALAR("a complex key",plain) + * VALUE + * SCALAR("another value",plain) + * KEY + * SCALAR("a mapping",plain) + * BLOCK-MAPPING-START + * KEY + * SCALAR("key 1",plain) + * VALUE + * SCALAR("value 1",plain) + * KEY + * SCALAR("key 2",plain) + * VALUE + * SCALAR("value 2",plain) + * BLOCK-END + * KEY + * SCALAR("a sequence",plain) + * VALUE + * BLOCK-SEQUENCE-START + * BLOCK-ENTRY + * SCALAR("item 1",plain) + * BLOCK-ENTRY + * SCALAR("item 2",plain) + * BLOCK-END + * BLOCK-END + * STREAM-END + * + * YAML does not always require to start a new block collection from a new + * line. If the current line contains only '-', '?', and ':' indicators, a new + * block collection may start at the current line. The following examples + * illustrate this case: + * + * 1. Collections in a sequence: + * + * - - item 1 + * - item 2 + * - key 1: value 1 + * key 2: value 2 + * - ? complex key + * : complex value + * + * Tokens: + * + * STREAM-START(utf-8) + * BLOCK-SEQUENCE-START + * BLOCK-ENTRY + * BLOCK-SEQUENCE-START + * BLOCK-ENTRY + * SCALAR("item 1",plain) + * BLOCK-ENTRY + * SCALAR("item 2",plain) + * BLOCK-END + * BLOCK-ENTRY + * BLOCK-MAPPING-START + * KEY + * SCALAR("key 1",plain) + * VALUE + * SCALAR("value 1",plain) + * KEY + * SCALAR("key 2",plain) + * VALUE + * SCALAR("value 2",plain) + * BLOCK-END + * BLOCK-ENTRY + * BLOCK-MAPPING-START + * KEY + * SCALAR("complex key") + * VALUE + * SCALAR("complex value") + * BLOCK-END + * BLOCK-END + * STREAM-END + * + * 2. Collections in a mapping: + * + * ? a sequence + * : - item 1 + * - item 2 + * ? a mapping + * : key 1: value 1 + * key 2: value 2 + * + * Tokens: + * + * STREAM-START(utf-8) + * BLOCK-MAPPING-START + * KEY + * SCALAR("a sequence",plain) + * VALUE + * BLOCK-SEQUENCE-START + * BLOCK-ENTRY + * SCALAR("item 1",plain) + * BLOCK-ENTRY + * SCALAR("item 2",plain) + * BLOCK-END + * KEY + * SCALAR("a mapping",plain) + * VALUE + * BLOCK-MAPPING-START + * KEY + * SCALAR("key 1",plain) + * VALUE + * SCALAR("value 1",plain) + * KEY + * SCALAR("key 2",plain) + * VALUE + * SCALAR("value 2",plain) + * BLOCK-END + * BLOCK-END + * STREAM-END + * + * YAML also permits non-indented sequences if they are included into a block + * mapping. In this case, the token BLOCK-SEQUENCE-START is not produced: + * + * key: + * - item 1 # BLOCK-SEQUENCE-START is NOT produced here. + * - item 2 + * + * Tokens: + * + * STREAM-START(utf-8) + * BLOCK-MAPPING-START + * KEY + * SCALAR("key",plain) + * VALUE + * BLOCK-ENTRY + * SCALAR("item 1",plain) + * BLOCK-ENTRY + * SCALAR("item 2",plain) + * BLOCK-END + */ + +#include "yaml_private.h" + +/* + * Ensure that the buffer contains the required number of characters. + * Return 1 on success, 0 on failure (reader error or memory error). + */ + +#define CACHE(parser,length) \ + (parser->unread >= (length) \ + ? 1 \ + : yaml_parser_update_buffer(parser, (length))) + +/* + * Advance the buffer pointer. + */ + +#define SKIP(parser) \ + (parser->mark.index ++, \ + parser->mark.column ++, \ + parser->unread --, \ + parser->buffer.pointer += WIDTH(parser->buffer)) + +#define SKIP_LINE(parser) \ + (IS_CRLF(parser->buffer) ? \ + (parser->mark.index += 2, \ + parser->mark.column = 0, \ + parser->mark.line ++, \ + parser->unread -= 2, \ + parser->buffer.pointer += 2) : \ + IS_BREAK(parser->buffer) ? \ + (parser->mark.index ++, \ + parser->mark.column = 0, \ + parser->mark.line ++, \ + parser->unread --, \ + parser->buffer.pointer += WIDTH(parser->buffer)) : 0) + +/* + * Copy a character to a string buffer and advance pointers. + */ + +#define READ(parser,string) \ + (STRING_EXTEND(parser,string) ? \ + (COPY(string,parser->buffer), \ + parser->mark.index ++, \ + parser->mark.column ++, \ + parser->unread --, \ + 1) : 0) + +/* + * Copy a line break character to a string buffer and advance pointers. + */ + +#define READ_LINE(parser,string) \ + (STRING_EXTEND(parser,string) ? \ + (((CHECK_AT(parser->buffer,'\r',0) \ + && CHECK_AT(parser->buffer,'\n',1)) ? /* CR LF -> LF */ \ + (*((string).pointer++) = (yaml_char_t) '\n', \ + parser->buffer.pointer += 2, \ + parser->mark.index += 2, \ + parser->mark.column = 0, \ + parser->mark.line ++, \ + parser->unread -= 2) : \ + (CHECK_AT(parser->buffer,'\r',0) \ + || CHECK_AT(parser->buffer,'\n',0)) ? /* CR|LF -> LF */ \ + (*((string).pointer++) = (yaml_char_t) '\n', \ + parser->buffer.pointer ++, \ + parser->mark.index ++, \ + parser->mark.column = 0, \ + parser->mark.line ++, \ + parser->unread --) : \ + (CHECK_AT(parser->buffer,'\xC2',0) \ + && CHECK_AT(parser->buffer,'\x85',1)) ? /* NEL -> LF */ \ + (*((string).pointer++) = (yaml_char_t) '\n', \ + parser->buffer.pointer += 2, \ + parser->mark.index ++, \ + parser->mark.column = 0, \ + parser->mark.line ++, \ + parser->unread --) : \ + (CHECK_AT(parser->buffer,'\xE2',0) && \ + CHECK_AT(parser->buffer,'\x80',1) && \ + (CHECK_AT(parser->buffer,'\xA8',2) || \ + CHECK_AT(parser->buffer,'\xA9',2))) ? /* LS|PS -> LS|PS */ \ + (*((string).pointer++) = *(parser->buffer.pointer++), \ + *((string).pointer++) = *(parser->buffer.pointer++), \ + *((string).pointer++) = *(parser->buffer.pointer++), \ + parser->mark.index ++, \ + parser->mark.column = 0, \ + parser->mark.line ++, \ + parser->unread --) : 0), \ + 1) : 0) + +/* + * Public API declarations. + */ + +YAML_DECLARE(int) +yaml_parser_scan(yaml_parser_t *parser, yaml_token_t *token); + +/* + * Error handling. + */ + +static int +yaml_parser_set_scanner_error(yaml_parser_t *parser, const char *context, + yaml_mark_t context_mark, const char *problem); + +/* + * High-level token API. + */ + +YAML_DECLARE(int) +yaml_parser_fetch_more_tokens(yaml_parser_t *parser); + +static int +yaml_parser_fetch_next_token(yaml_parser_t *parser); + +/* + * Potential simple keys. + */ + +static int +yaml_parser_stale_simple_keys(yaml_parser_t *parser); + +static int +yaml_parser_save_simple_key(yaml_parser_t *parser); + +static int +yaml_parser_remove_simple_key(yaml_parser_t *parser); + +static int +yaml_parser_increase_flow_level(yaml_parser_t *parser); + +static int +yaml_parser_decrease_flow_level(yaml_parser_t *parser); + +/* + * Indentation treatment. + */ + +static int +yaml_parser_roll_indent(yaml_parser_t *parser, int column, + int number, yaml_token_type_t type, yaml_mark_t mark); + +static int +yaml_parser_unroll_indent(yaml_parser_t *parser, int column); + +/* + * Token fetchers. + */ + +static int +yaml_parser_fetch_stream_start(yaml_parser_t *parser); + +static int +yaml_parser_fetch_stream_end(yaml_parser_t *parser); + +static int +yaml_parser_fetch_directive(yaml_parser_t *parser); + +static int +yaml_parser_fetch_document_indicator(yaml_parser_t *parser, + yaml_token_type_t type); + +static int +yaml_parser_fetch_flow_collection_start(yaml_parser_t *parser, + yaml_token_type_t type); + +static int +yaml_parser_fetch_flow_collection_end(yaml_parser_t *parser, + yaml_token_type_t type); + +static int +yaml_parser_fetch_flow_entry(yaml_parser_t *parser); + +static int +yaml_parser_fetch_block_entry(yaml_parser_t *parser); + +static int +yaml_parser_fetch_key(yaml_parser_t *parser); + +static int +yaml_parser_fetch_value(yaml_parser_t *parser); + +static int +yaml_parser_fetch_anchor(yaml_parser_t *parser, yaml_token_type_t type); + +static int +yaml_parser_fetch_tag(yaml_parser_t *parser); + +static int +yaml_parser_fetch_block_scalar(yaml_parser_t *parser, int literal); + +static int +yaml_parser_fetch_flow_scalar(yaml_parser_t *parser, int single); + +static int +yaml_parser_fetch_plain_scalar(yaml_parser_t *parser); + +/* + * Token scanners. + */ + +static int +yaml_parser_scan_to_next_token(yaml_parser_t *parser); + +static int +yaml_parser_scan_directive(yaml_parser_t *parser, yaml_token_t *token); + +static int +yaml_parser_scan_directive_name(yaml_parser_t *parser, + yaml_mark_t start_mark, yaml_char_t **name); + +static int +yaml_parser_scan_version_directive_value(yaml_parser_t *parser, + yaml_mark_t start_mark, int *major, int *minor); + +static int +yaml_parser_scan_version_directive_number(yaml_parser_t *parser, + yaml_mark_t start_mark, int *number); + +static int +yaml_parser_scan_tag_directive_value(yaml_parser_t *parser, + yaml_mark_t mark, yaml_char_t **handle, yaml_char_t **prefix); + +static int +yaml_parser_scan_anchor(yaml_parser_t *parser, yaml_token_t *token, + yaml_token_type_t type); + +static int +yaml_parser_scan_tag(yaml_parser_t *parser, yaml_token_t *token); + +static int +yaml_parser_scan_tag_handle(yaml_parser_t *parser, int directive, + yaml_mark_t start_mark, yaml_char_t **handle); + +static int +yaml_parser_scan_tag_uri(yaml_parser_t *parser, int directive, + yaml_char_t *head, yaml_mark_t start_mark, yaml_char_t **uri); + +static int +yaml_parser_scan_uri_escapes(yaml_parser_t *parser, int directive, + yaml_mark_t start_mark, yaml_string_t *string); + +static int +yaml_parser_scan_block_scalar(yaml_parser_t *parser, yaml_token_t *token, + int literal); + +static int +yaml_parser_scan_block_scalar_breaks(yaml_parser_t *parser, + int *indent, yaml_string_t *breaks, + yaml_mark_t start_mark, yaml_mark_t *end_mark); + +static int +yaml_parser_scan_flow_scalar(yaml_parser_t *parser, yaml_token_t *token, + int single); + +static int +yaml_parser_scan_plain_scalar(yaml_parser_t *parser, yaml_token_t *token); + +/* + * Get the next token. + */ + +YAML_DECLARE(int) +yaml_parser_scan(yaml_parser_t *parser, yaml_token_t *token) +{ + assert(parser); /* Non-NULL parser object is expected. */ + assert(token); /* Non-NULL token object is expected. */ + + /* Erase the token object. */ + + memset(token, 0, sizeof(yaml_token_t)); + + /* No tokens after STREAM-END or error. */ + + if (parser->stream_end_produced || parser->error) { + return 1; + } + + /* Ensure that the tokens queue contains enough tokens. */ + + if (!parser->token_available) { + if (!yaml_parser_fetch_more_tokens(parser)) + return 0; + } + + /* Fetch the next token from the queue. */ + + *token = DEQUEUE(parser, parser->tokens); + parser->token_available = 0; + parser->tokens_parsed ++; + + if (token->type == YAML_STREAM_END_TOKEN) { + parser->stream_end_produced = 1; + } + + return 1; +} + +/* + * Set the scanner error and return 0. + */ + +static int +yaml_parser_set_scanner_error(yaml_parser_t *parser, const char *context, + yaml_mark_t context_mark, const char *problem) +{ + parser->error = YAML_SCANNER_ERROR; + parser->context = context; + parser->context_mark = context_mark; + parser->problem = problem; + parser->problem_mark = parser->mark; + + return 0; +} + +/* + * Ensure that the tokens queue contains at least one token which can be + * returned to the Parser. + */ + +YAML_DECLARE(int) +yaml_parser_fetch_more_tokens(yaml_parser_t *parser) +{ + int need_more_tokens; + + /* While we need more tokens to fetch, do it. */ + + while (1) + { + /* + * Check if we really need to fetch more tokens. + */ + + need_more_tokens = 0; + + if (parser->tokens.head == parser->tokens.tail) + { + /* Queue is empty. */ + + need_more_tokens = 1; + } + else + { + yaml_simple_key_t *simple_key; + + /* Check if any potential simple key may occupy the head position. */ + + if (!yaml_parser_stale_simple_keys(parser)) + return 0; + + for (simple_key = parser->simple_keys.start; + simple_key != parser->simple_keys.top; simple_key++) { + if (simple_key->possible + && simple_key->token_number == parser->tokens_parsed) { + need_more_tokens = 1; + break; + } + } + } + + /* We are finished. */ + + if (!need_more_tokens) + break; + + /* Fetch the next token. */ + + if (!yaml_parser_fetch_next_token(parser)) + return 0; + } + + parser->token_available = 1; + + return 1; +} + +/* + * The dispatcher for token fetchers. + */ + +static int +yaml_parser_fetch_next_token(yaml_parser_t *parser) +{ + /* Ensure that the buffer is initialized. */ + + if (!CACHE(parser, 1)) + return 0; + + /* Check if we just started scanning. Fetch STREAM-START then. */ + + if (!parser->stream_start_produced) + return yaml_parser_fetch_stream_start(parser); + + /* Eat whitespaces and comments until we reach the next token. */ + + if (!yaml_parser_scan_to_next_token(parser)) + return 0; + + /* Remove obsolete potential simple keys. */ + + if (!yaml_parser_stale_simple_keys(parser)) + return 0; + + /* Check the indentation level against the current column. */ + + if (!yaml_parser_unroll_indent(parser, parser->mark.column)) + return 0; + + /* + * Ensure that the buffer contains at least 4 characters. 4 is the length + * of the longest indicators ('--- ' and '... '). + */ + + if (!CACHE(parser, 4)) + return 0; + + /* Is it the end of the stream? */ + + if (IS_Z(parser->buffer)) + return yaml_parser_fetch_stream_end(parser); + + /* Is it a directive? */ + + if (parser->mark.column == 0 && CHECK(parser->buffer, '%')) + return yaml_parser_fetch_directive(parser); + + /* Is it the document start indicator? */ + + if (parser->mark.column == 0 + && CHECK_AT(parser->buffer, '-', 0) + && CHECK_AT(parser->buffer, '-', 1) + && CHECK_AT(parser->buffer, '-', 2) + && IS_BLANKZ_AT(parser->buffer, 3)) + return yaml_parser_fetch_document_indicator(parser, + YAML_DOCUMENT_START_TOKEN); + + /* Is it the document end indicator? */ + + if (parser->mark.column == 0 + && CHECK_AT(parser->buffer, '.', 0) + && CHECK_AT(parser->buffer, '.', 1) + && CHECK_AT(parser->buffer, '.', 2) + && IS_BLANKZ_AT(parser->buffer, 3)) + return yaml_parser_fetch_document_indicator(parser, + YAML_DOCUMENT_END_TOKEN); + + /* Is it the flow sequence start indicator? */ + + if (CHECK(parser->buffer, '[')) + return yaml_parser_fetch_flow_collection_start(parser, + YAML_FLOW_SEQUENCE_START_TOKEN); + + /* Is it the flow mapping start indicator? */ + + if (CHECK(parser->buffer, '{')) + return yaml_parser_fetch_flow_collection_start(parser, + YAML_FLOW_MAPPING_START_TOKEN); + + /* Is it the flow sequence end indicator? */ + + if (CHECK(parser->buffer, ']')) + return yaml_parser_fetch_flow_collection_end(parser, + YAML_FLOW_SEQUENCE_END_TOKEN); + + /* Is it the flow mapping end indicator? */ + + if (CHECK(parser->buffer, '}')) + return yaml_parser_fetch_flow_collection_end(parser, + YAML_FLOW_MAPPING_END_TOKEN); + + /* Is it the flow entry indicator? */ + + if (CHECK(parser->buffer, ',')) + return yaml_parser_fetch_flow_entry(parser); + + /* Is it the block entry indicator? */ + + if (CHECK(parser->buffer, '-') && IS_BLANKZ_AT(parser->buffer, 1)) + return yaml_parser_fetch_block_entry(parser); + + /* Is it the key indicator? */ + + if (CHECK(parser->buffer, '?') + && (parser->flow_level || IS_BLANKZ_AT(parser->buffer, 1))) + return yaml_parser_fetch_key(parser); + + /* Is it the value indicator? */ + + if (CHECK(parser->buffer, ':') + && (parser->flow_level || IS_BLANKZ_AT(parser->buffer, 1))) + return yaml_parser_fetch_value(parser); + + /* Is it an alias? */ + + if (CHECK(parser->buffer, '*')) + return yaml_parser_fetch_anchor(parser, YAML_ALIAS_TOKEN); + + /* Is it an anchor? */ + + if (CHECK(parser->buffer, '&')) + return yaml_parser_fetch_anchor(parser, YAML_ANCHOR_TOKEN); + + /* Is it a tag? */ + + if (CHECK(parser->buffer, '!')) + return yaml_parser_fetch_tag(parser); + + /* Is it a literal scalar? */ + + if (CHECK(parser->buffer, '|') && !parser->flow_level) + return yaml_parser_fetch_block_scalar(parser, 1); + + /* Is it a folded scalar? */ + + if (CHECK(parser->buffer, '>') && !parser->flow_level) + return yaml_parser_fetch_block_scalar(parser, 0); + + /* Is it a single-quoted scalar? */ + + if (CHECK(parser->buffer, '\'')) + return yaml_parser_fetch_flow_scalar(parser, 1); + + /* Is it a double-quoted scalar? */ + + if (CHECK(parser->buffer, '"')) + return yaml_parser_fetch_flow_scalar(parser, 0); + + /* + * Is it a plain scalar? + * + * A plain scalar may start with any non-blank characters except + * + * '-', '?', ':', ',', '[', ']', '{', '}', + * '#', '&', '*', '!', '|', '>', '\'', '\"', + * '%', '@', '`'. + * + * In the block context (and, for the '-' indicator, in the flow context + * too), it may also start with the characters + * + * '-', '?', ':' + * + * if it is followed by a non-space character. + * + * The last rule is more restrictive than the specification requires. + */ + + if (!(IS_BLANKZ(parser->buffer) || CHECK(parser->buffer, '-') + || CHECK(parser->buffer, '?') || CHECK(parser->buffer, ':') + || CHECK(parser->buffer, ',') || CHECK(parser->buffer, '[') + || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '{') + || CHECK(parser->buffer, '}') || CHECK(parser->buffer, '#') + || CHECK(parser->buffer, '&') || CHECK(parser->buffer, '*') + || CHECK(parser->buffer, '!') || CHECK(parser->buffer, '|') + || CHECK(parser->buffer, '>') || CHECK(parser->buffer, '\'') + || CHECK(parser->buffer, '"') || CHECK(parser->buffer, '%') + || CHECK(parser->buffer, '@') || CHECK(parser->buffer, '`')) || + (CHECK(parser->buffer, '-') && !IS_BLANK_AT(parser->buffer, 1)) || + (!parser->flow_level && + (CHECK(parser->buffer, '?') || CHECK(parser->buffer, ':')) + && !IS_BLANKZ_AT(parser->buffer, 1))) + return yaml_parser_fetch_plain_scalar(parser); + + /* + * If we don't determine the token type so far, it is an error. + */ + + return yaml_parser_set_scanner_error(parser, + "while scanning for the next token", parser->mark, + "found character that cannot start any token"); +} + +/* + * Check the list of potential simple keys and remove the positions that + * cannot contain simple keys anymore. + */ + +static int +yaml_parser_stale_simple_keys(yaml_parser_t *parser) +{ + yaml_simple_key_t *simple_key; + + /* Check for a potential simple key for each flow level. */ + + for (simple_key = parser->simple_keys.start; + simple_key != parser->simple_keys.top; simple_key ++) + { + /* + * The specification requires that a simple key + * + * - is limited to a single line, + * - is shorter than 1024 characters. + */ + + if (simple_key->possible + && (simple_key->mark.line < parser->mark.line + || simple_key->mark.index+1024 < parser->mark.index)) { + + /* Check if the potential simple key to be removed is required. */ + + if (simple_key->required) { + return yaml_parser_set_scanner_error(parser, + "while scanning a simple key", simple_key->mark, + "could not find expected ':'"); + } + + simple_key->possible = 0; + } + } + + return 1; +} + +/* + * Check if a simple key may start at the current position and add it if + * needed. + */ + +static int +yaml_parser_save_simple_key(yaml_parser_t *parser) +{ + /* + * A simple key is required at the current position if the scanner is in + * the block context and the current column coincides with the indentation + * level. + */ + + int required = (!parser->flow_level + && parser->indent == (int)parser->mark.column); + + /* + * A simple key is required only when it is the first token in the current + * line. Therefore it is always allowed. But we add a check anyway. + */ + + assert(parser->simple_key_allowed || !required); /* Impossible. */ + + /* + * If the current position may start a simple key, save it. + */ + + if (parser->simple_key_allowed) + { + yaml_simple_key_t simple_key; + simple_key.possible = 1; + simple_key.required = required; + simple_key.token_number = + parser->tokens_parsed + (parser->tokens.tail - parser->tokens.head); + simple_key.mark = parser->mark; + + if (!yaml_parser_remove_simple_key(parser)) return 0; + + *(parser->simple_keys.top-1) = simple_key; + } + + return 1; +} + +/* + * Remove a potential simple key at the current flow level. + */ + +static int +yaml_parser_remove_simple_key(yaml_parser_t *parser) +{ + yaml_simple_key_t *simple_key = parser->simple_keys.top-1; + + if (simple_key->possible) + { + /* If the key is required, it is an error. */ + + if (simple_key->required) { + return yaml_parser_set_scanner_error(parser, + "while scanning a simple key", simple_key->mark, + "could not find expected ':'"); + } + } + + /* Remove the key from the stack. */ + + simple_key->possible = 0; + + return 1; +} + +/* + * Increase the flow level and resize the simple key list if needed. + */ + +static int +yaml_parser_increase_flow_level(yaml_parser_t *parser) +{ + yaml_simple_key_t empty_simple_key = { 0, 0, 0, { 0, 0, 0 } }; + + /* Reset the simple key on the next level. */ + + if (!PUSH(parser, parser->simple_keys, empty_simple_key)) + return 0; + + /* Increase the flow level. */ + + parser->flow_level++; + + return 1; +} + +/* + * Decrease the flow level. + */ + +static int +yaml_parser_decrease_flow_level(yaml_parser_t *parser) +{ + yaml_simple_key_t dummy_key; /* Used to eliminate a compiler warning. */ + + if (parser->flow_level) { + parser->flow_level --; + dummy_key = POP(parser, parser->simple_keys); + } + + return 1; +} + +/* + * Push the current indentation level to the stack and set the new level + * the current column is greater than the indentation level. In this case, + * append or insert the specified token into the token queue. + * + */ + +static int +yaml_parser_roll_indent(yaml_parser_t *parser, int column, + int number, yaml_token_type_t type, yaml_mark_t mark) +{ + yaml_token_t token; + + /* In the flow context, do nothing. */ + + if (parser->flow_level) + return 1; + + if (parser->indent < column) + { + /* + * Push the current indentation level to the stack and set the new + * indentation level. + */ + + if (!PUSH(parser, parser->indents, parser->indent)) + return 0; + + parser->indent = column; + + /* Create a token and insert it into the queue. */ + + TOKEN_INIT(token, type, mark, mark); + + if (number == -1) { + if (!ENQUEUE(parser, parser->tokens, token)) + return 0; + } + else { + if (!QUEUE_INSERT(parser, + parser->tokens, number - parser->tokens_parsed, token)) + return 0; + } + } + + return 1; +} + +/* + * Pop indentation levels from the indents stack until the current level + * becomes less or equal to the column. For each intendation level, append + * the BLOCK-END token. + */ + + +static int +yaml_parser_unroll_indent(yaml_parser_t *parser, int column) +{ + yaml_token_t token; + + /* In the flow context, do nothing. */ + + if (parser->flow_level) + return 1; + + /* Loop through the intendation levels in the stack. */ + + while (parser->indent > column) + { + /* Create a token and append it to the queue. */ + + TOKEN_INIT(token, YAML_BLOCK_END_TOKEN, parser->mark, parser->mark); + + if (!ENQUEUE(parser, parser->tokens, token)) + return 0; + + /* Pop the indentation level. */ + + parser->indent = POP(parser, parser->indents); + } + + return 1; +} + +/* + * Initialize the scanner and produce the STREAM-START token. + */ + +static int +yaml_parser_fetch_stream_start(yaml_parser_t *parser) +{ + yaml_simple_key_t simple_key = { 0, 0, 0, { 0, 0, 0 } }; + yaml_token_t token; + + /* Set the initial indentation. */ + + parser->indent = -1; + + /* Initialize the simple key stack. */ + + if (!PUSH(parser, parser->simple_keys, simple_key)) + return 0; + + /* A simple key is allowed at the beginning of the stream. */ + + parser->simple_key_allowed = 1; + + /* We have started. */ + + parser->stream_start_produced = 1; + + /* Create the STREAM-START token and append it to the queue. */ + + STREAM_START_TOKEN_INIT(token, parser->encoding, + parser->mark, parser->mark); + + if (!ENQUEUE(parser, parser->tokens, token)) + return 0; + + return 1; +} + +/* + * Produce the STREAM-END token and shut down the scanner. + */ + +static int +yaml_parser_fetch_stream_end(yaml_parser_t *parser) +{ + yaml_token_t token; + + /* Force new line. */ + + if (parser->mark.column != 0) { + parser->mark.column = 0; + parser->mark.line ++; + } + + /* Reset the indentation level. */ + + if (!yaml_parser_unroll_indent(parser, -1)) + return 0; + + /* Reset simple keys. */ + + if (!yaml_parser_remove_simple_key(parser)) + return 0; + + parser->simple_key_allowed = 0; + + /* Create the STREAM-END token and append it to the queue. */ + + STREAM_END_TOKEN_INIT(token, parser->mark, parser->mark); + + if (!ENQUEUE(parser, parser->tokens, token)) + return 0; + + return 1; +} + +/* + * Produce a VERSION-DIRECTIVE or TAG-DIRECTIVE token. + */ + +static int +yaml_parser_fetch_directive(yaml_parser_t *parser) +{ + yaml_token_t token; + + /* Reset the indentation level. */ + + if (!yaml_parser_unroll_indent(parser, -1)) + return 0; + + /* Reset simple keys. */ + + if (!yaml_parser_remove_simple_key(parser)) + return 0; + + parser->simple_key_allowed = 0; + + /* Create the YAML-DIRECTIVE or TAG-DIRECTIVE token. */ + + if (!yaml_parser_scan_directive(parser, &token)) + return 0; + + /* Append the token to the queue. */ + + if (!ENQUEUE(parser, parser->tokens, token)) { + yaml_token_delete(&token); + return 0; + } + + return 1; +} + +/* + * Produce the DOCUMENT-START or DOCUMENT-END token. + */ + +static int +yaml_parser_fetch_document_indicator(yaml_parser_t *parser, + yaml_token_type_t type) +{ + yaml_mark_t start_mark, end_mark; + yaml_token_t token; + + /* Reset the indentation level. */ + + if (!yaml_parser_unroll_indent(parser, -1)) + return 0; + + /* Reset simple keys. */ + + if (!yaml_parser_remove_simple_key(parser)) + return 0; + + parser->simple_key_allowed = 0; + + /* Consume the token. */ + + start_mark = parser->mark; + + SKIP(parser); + SKIP(parser); + SKIP(parser); + + end_mark = parser->mark; + + /* Create the DOCUMENT-START or DOCUMENT-END token. */ + + TOKEN_INIT(token, type, start_mark, end_mark); + + /* Append the token to the queue. */ + + if (!ENQUEUE(parser, parser->tokens, token)) + return 0; + + return 1; +} + +/* + * Produce the FLOW-SEQUENCE-START or FLOW-MAPPING-START token. + */ + +static int +yaml_parser_fetch_flow_collection_start(yaml_parser_t *parser, + yaml_token_type_t type) +{ + yaml_mark_t start_mark, end_mark; + yaml_token_t token; + + /* The indicators '[' and '{' may start a simple key. */ + + if (!yaml_parser_save_simple_key(parser)) + return 0; + + /* Increase the flow level. */ + + if (!yaml_parser_increase_flow_level(parser)) + return 0; + + /* A simple key may follow the indicators '[' and '{'. */ + + parser->simple_key_allowed = 1; + + /* Consume the token. */ + + start_mark = parser->mark; + SKIP(parser); + end_mark = parser->mark; + + /* Create the FLOW-SEQUENCE-START of FLOW-MAPPING-START token. */ + + TOKEN_INIT(token, type, start_mark, end_mark); + + /* Append the token to the queue. */ + + if (!ENQUEUE(parser, parser->tokens, token)) + return 0; + + return 1; +} + +/* + * Produce the FLOW-SEQUENCE-END or FLOW-MAPPING-END token. + */ + +static int +yaml_parser_fetch_flow_collection_end(yaml_parser_t *parser, + yaml_token_type_t type) +{ + yaml_mark_t start_mark, end_mark; + yaml_token_t token; + + /* Reset any potential simple key on the current flow level. */ + + if (!yaml_parser_remove_simple_key(parser)) + return 0; + + /* Decrease the flow level. */ + + if (!yaml_parser_decrease_flow_level(parser)) + return 0; + + /* No simple keys after the indicators ']' and '}'. */ + + parser->simple_key_allowed = 0; + + /* Consume the token. */ + + start_mark = parser->mark; + SKIP(parser); + end_mark = parser->mark; + + /* Create the FLOW-SEQUENCE-END of FLOW-MAPPING-END token. */ + + TOKEN_INIT(token, type, start_mark, end_mark); + + /* Append the token to the queue. */ + + if (!ENQUEUE(parser, parser->tokens, token)) + return 0; + + return 1; +} + +/* + * Produce the FLOW-ENTRY token. + */ + +static int +yaml_parser_fetch_flow_entry(yaml_parser_t *parser) +{ + yaml_mark_t start_mark, end_mark; + yaml_token_t token; + + /* Reset any potential simple keys on the current flow level. */ + + if (!yaml_parser_remove_simple_key(parser)) + return 0; + + /* Simple keys are allowed after ','. */ + + parser->simple_key_allowed = 1; + + /* Consume the token. */ + + start_mark = parser->mark; + SKIP(parser); + end_mark = parser->mark; + + /* Create the FLOW-ENTRY token and append it to the queue. */ + + TOKEN_INIT(token, YAML_FLOW_ENTRY_TOKEN, start_mark, end_mark); + + if (!ENQUEUE(parser, parser->tokens, token)) + return 0; + + return 1; +} + +/* + * Produce the BLOCK-ENTRY token. + */ + +static int +yaml_parser_fetch_block_entry(yaml_parser_t *parser) +{ + yaml_mark_t start_mark, end_mark; + yaml_token_t token; + + /* Check if the scanner is in the block context. */ + + if (!parser->flow_level) + { + /* Check if we are allowed to start a new entry. */ + + if (!parser->simple_key_allowed) { + return yaml_parser_set_scanner_error(parser, NULL, parser->mark, + "block sequence entries are not allowed in this context"); + } + + /* Add the BLOCK-SEQUENCE-START token if needed. */ + + if (!yaml_parser_roll_indent(parser, parser->mark.column, -1, + YAML_BLOCK_SEQUENCE_START_TOKEN, parser->mark)) + return 0; + } + else + { + /* + * It is an error for the '-' indicator to occur in the flow context, + * but we let the Parser detect and report about it because the Parser + * is able to point to the context. + */ + } + + /* Reset any potential simple keys on the current flow level. */ + + if (!yaml_parser_remove_simple_key(parser)) + return 0; + + /* Simple keys are allowed after '-'. */ + + parser->simple_key_allowed = 1; + + /* Consume the token. */ + + start_mark = parser->mark; + SKIP(parser); + end_mark = parser->mark; + + /* Create the BLOCK-ENTRY token and append it to the queue. */ + + TOKEN_INIT(token, YAML_BLOCK_ENTRY_TOKEN, start_mark, end_mark); + + if (!ENQUEUE(parser, parser->tokens, token)) + return 0; + + return 1; +} + +/* + * Produce the KEY token. + */ + +static int +yaml_parser_fetch_key(yaml_parser_t *parser) +{ + yaml_mark_t start_mark, end_mark; + yaml_token_t token; + + /* In the block context, additional checks are required. */ + + if (!parser->flow_level) + { + /* Check if we are allowed to start a new key (not nessesary simple). */ + + if (!parser->simple_key_allowed) { + return yaml_parser_set_scanner_error(parser, NULL, parser->mark, + "mapping keys are not allowed in this context"); + } + + /* Add the BLOCK-MAPPING-START token if needed. */ + + if (!yaml_parser_roll_indent(parser, parser->mark.column, -1, + YAML_BLOCK_MAPPING_START_TOKEN, parser->mark)) + return 0; + } + + /* Reset any potential simple keys on the current flow level. */ + + if (!yaml_parser_remove_simple_key(parser)) + return 0; + + /* Simple keys are allowed after '?' in the block context. */ + + parser->simple_key_allowed = (!parser->flow_level); + + /* Consume the token. */ + + start_mark = parser->mark; + SKIP(parser); + end_mark = parser->mark; + + /* Create the KEY token and append it to the queue. */ + + TOKEN_INIT(token, YAML_KEY_TOKEN, start_mark, end_mark); + + if (!ENQUEUE(parser, parser->tokens, token)) + return 0; + + return 1; +} + +/* + * Produce the VALUE token. + */ + +static int +yaml_parser_fetch_value(yaml_parser_t *parser) +{ + yaml_mark_t start_mark, end_mark; + yaml_token_t token; + yaml_simple_key_t *simple_key = parser->simple_keys.top-1; + + /* Have we found a simple key? */ + + if (simple_key->possible) + { + + /* Create the KEY token and insert it into the queue. */ + + TOKEN_INIT(token, YAML_KEY_TOKEN, simple_key->mark, simple_key->mark); + + if (!QUEUE_INSERT(parser, parser->tokens, + simple_key->token_number - parser->tokens_parsed, token)) + return 0; + + /* In the block context, we may need to add the BLOCK-MAPPING-START token. */ + + if (!yaml_parser_roll_indent(parser, simple_key->mark.column, + simple_key->token_number, + YAML_BLOCK_MAPPING_START_TOKEN, simple_key->mark)) + return 0; + + /* Remove the simple key. */ + + simple_key->possible = 0; + + /* A simple key cannot follow another simple key. */ + + parser->simple_key_allowed = 0; + } + else + { + /* The ':' indicator follows a complex key. */ + + /* In the block context, extra checks are required. */ + + if (!parser->flow_level) + { + /* Check if we are allowed to start a complex value. */ + + if (!parser->simple_key_allowed) { + return yaml_parser_set_scanner_error(parser, NULL, parser->mark, + "mapping values are not allowed in this context"); + } + + /* Add the BLOCK-MAPPING-START token if needed. */ + + if (!yaml_parser_roll_indent(parser, parser->mark.column, -1, + YAML_BLOCK_MAPPING_START_TOKEN, parser->mark)) + return 0; + } + + /* Simple keys after ':' are allowed in the block context. */ + + parser->simple_key_allowed = (!parser->flow_level); + } + + /* Consume the token. */ + + start_mark = parser->mark; + SKIP(parser); + end_mark = parser->mark; + + /* Create the VALUE token and append it to the queue. */ + + TOKEN_INIT(token, YAML_VALUE_TOKEN, start_mark, end_mark); + + if (!ENQUEUE(parser, parser->tokens, token)) + return 0; + + return 1; +} + +/* + * Produce the ALIAS or ANCHOR token. + */ + +static int +yaml_parser_fetch_anchor(yaml_parser_t *parser, yaml_token_type_t type) +{ + yaml_token_t token; + + /* An anchor or an alias could be a simple key. */ + + if (!yaml_parser_save_simple_key(parser)) + return 0; + + /* A simple key cannot follow an anchor or an alias. */ + + parser->simple_key_allowed = 0; + + /* Create the ALIAS or ANCHOR token and append it to the queue. */ + + if (!yaml_parser_scan_anchor(parser, &token, type)) + return 0; + + if (!ENQUEUE(parser, parser->tokens, token)) { + yaml_token_delete(&token); + return 0; + } + return 1; +} + +/* + * Produce the TAG token. + */ + +static int +yaml_parser_fetch_tag(yaml_parser_t *parser) +{ + yaml_token_t token; + + /* A tag could be a simple key. */ + + if (!yaml_parser_save_simple_key(parser)) + return 0; + + /* A simple key cannot follow a tag. */ + + parser->simple_key_allowed = 0; + + /* Create the TAG token and append it to the queue. */ + + if (!yaml_parser_scan_tag(parser, &token)) + return 0; + + if (!ENQUEUE(parser, parser->tokens, token)) { + yaml_token_delete(&token); + return 0; + } + + return 1; +} + +/* + * Produce the SCALAR(...,literal) or SCALAR(...,folded) tokens. + */ + +static int +yaml_parser_fetch_block_scalar(yaml_parser_t *parser, int literal) +{ + yaml_token_t token; + + /* Remove any potential simple keys. */ + + if (!yaml_parser_remove_simple_key(parser)) + return 0; + + /* A simple key may follow a block scalar. */ + + parser->simple_key_allowed = 1; + + /* Create the SCALAR token and append it to the queue. */ + + if (!yaml_parser_scan_block_scalar(parser, &token, literal)) + return 0; + + if (!ENQUEUE(parser, parser->tokens, token)) { + yaml_token_delete(&token); + return 0; + } + + return 1; +} + +/* + * Produce the SCALAR(...,single-quoted) or SCALAR(...,double-quoted) tokens. + */ + +static int +yaml_parser_fetch_flow_scalar(yaml_parser_t *parser, int single) +{ + yaml_token_t token; + + /* A plain scalar could be a simple key. */ + + if (!yaml_parser_save_simple_key(parser)) + return 0; + + /* A simple key cannot follow a flow scalar. */ + + parser->simple_key_allowed = 0; + + /* Create the SCALAR token and append it to the queue. */ + + if (!yaml_parser_scan_flow_scalar(parser, &token, single)) + return 0; + + if (!ENQUEUE(parser, parser->tokens, token)) { + yaml_token_delete(&token); + return 0; + } + + return 1; +} + +/* + * Produce the SCALAR(...,plain) token. + */ + +static int +yaml_parser_fetch_plain_scalar(yaml_parser_t *parser) +{ + yaml_token_t token; + + /* A plain scalar could be a simple key. */ + + if (!yaml_parser_save_simple_key(parser)) + return 0; + + /* A simple key cannot follow a flow scalar. */ + + parser->simple_key_allowed = 0; + + /* Create the SCALAR token and append it to the queue. */ + + if (!yaml_parser_scan_plain_scalar(parser, &token)) + return 0; + + if (!ENQUEUE(parser, parser->tokens, token)) { + yaml_token_delete(&token); + return 0; + } + + return 1; +} + +/* + * Eat whitespaces and comments until the next token is found. + */ + +static int +yaml_parser_scan_to_next_token(yaml_parser_t *parser) +{ + /* Until the next token is not found. */ + + while (1) + { + /* Allow the BOM mark to start a line. */ + + if (!CACHE(parser, 1)) return 0; + + if (parser->mark.column == 0 && IS_BOM(parser->buffer)) + SKIP(parser); + + /* + * Eat whitespaces. + * + * Tabs are allowed: + * + * - in the flow context; + * - in the block context, but not at the beginning of the line or + * after '-', '?', or ':' (complex value). + */ + + if (!CACHE(parser, 1)) return 0; + + while (CHECK(parser->buffer,' ') || + ((parser->flow_level || !parser->simple_key_allowed) && + CHECK(parser->buffer, '\t'))) { + SKIP(parser); + if (!CACHE(parser, 1)) return 0; + } + + /* Eat a comment until a line break. */ + + if (CHECK(parser->buffer, '#')) { + while (!IS_BREAKZ(parser->buffer)) { + SKIP(parser); + if (!CACHE(parser, 1)) return 0; + } + } + + /* If it is a line break, eat it. */ + + if (IS_BREAK(parser->buffer)) + { + if (!CACHE(parser, 2)) return 0; + SKIP_LINE(parser); + + /* In the block context, a new line may start a simple key. */ + + if (!parser->flow_level) { + parser->simple_key_allowed = 1; + } + } + else + { + /* We have found a token. */ + + break; + } + } + + return 1; +} + +/* + * Scan a YAML-DIRECTIVE or TAG-DIRECTIVE token. + * + * Scope: + * %YAML 1.1 # a comment \n + * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + * %TAG !yaml! tag:yaml.org,2002: \n + * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + */ + +int +yaml_parser_scan_directive(yaml_parser_t *parser, yaml_token_t *token) +{ + yaml_mark_t start_mark, end_mark; + yaml_char_t *name = NULL; + int major, minor; + yaml_char_t *handle = NULL, *prefix = NULL; + + /* Eat '%'. */ + + start_mark = parser->mark; + + SKIP(parser); + + /* Scan the directive name. */ + + if (!yaml_parser_scan_directive_name(parser, start_mark, &name)) + goto error; + + /* Is it a YAML directive? */ + + if (strcmp((char *)name, "YAML") == 0) + { + /* Scan the VERSION directive value. */ + + if (!yaml_parser_scan_version_directive_value(parser, start_mark, + &major, &minor)) + goto error; + + end_mark = parser->mark; + + /* Create a VERSION-DIRECTIVE token. */ + + VERSION_DIRECTIVE_TOKEN_INIT(*token, major, minor, + start_mark, end_mark); + } + + /* Is it a TAG directive? */ + + else if (strcmp((char *)name, "TAG") == 0) + { + /* Scan the TAG directive value. */ + + if (!yaml_parser_scan_tag_directive_value(parser, start_mark, + &handle, &prefix)) + goto error; + + end_mark = parser->mark; + + /* Create a TAG-DIRECTIVE token. */ + + TAG_DIRECTIVE_TOKEN_INIT(*token, handle, prefix, + start_mark, end_mark); + } + + /* Unknown directive. */ + + else + { + yaml_parser_set_scanner_error(parser, "while scanning a directive", + start_mark, "found uknown directive name"); + goto error; + } + + /* Eat the rest of the line including any comments. */ + + if (!CACHE(parser, 1)) goto error; + + while (IS_BLANK(parser->buffer)) { + SKIP(parser); + if (!CACHE(parser, 1)) goto error; + } + + if (CHECK(parser->buffer, '#')) { + while (!IS_BREAKZ(parser->buffer)) { + SKIP(parser); + if (!CACHE(parser, 1)) goto error; + } + } + + /* Check if we are at the end of the line. */ + + if (!IS_BREAKZ(parser->buffer)) { + yaml_parser_set_scanner_error(parser, "while scanning a directive", + start_mark, "did not find expected comment or line break"); + goto error; + } + + /* Eat a line break. */ + + if (IS_BREAK(parser->buffer)) { + if (!CACHE(parser, 2)) goto error; + SKIP_LINE(parser); + } + + yaml_free(name); + + return 1; + +error: + yaml_free(prefix); + yaml_free(handle); + yaml_free(name); + return 0; +} + +/* + * Scan the directive name. + * + * Scope: + * %YAML 1.1 # a comment \n + * ^^^^ + * %TAG !yaml! tag:yaml.org,2002: \n + * ^^^ + */ + +static int +yaml_parser_scan_directive_name(yaml_parser_t *parser, + yaml_mark_t start_mark, yaml_char_t **name) +{ + yaml_string_t string = NULL_STRING; + + if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error; + + /* Consume the directive name. */ + + if (!CACHE(parser, 1)) goto error; + + while (IS_ALPHA(parser->buffer)) + { + if (!READ(parser, string)) goto error; + if (!CACHE(parser, 1)) goto error; + } + + /* Check if the name is empty. */ + + if (string.start == string.pointer) { + yaml_parser_set_scanner_error(parser, "while scanning a directive", + start_mark, "could not find expected directive name"); + goto error; + } + + /* Check for an blank character after the name. */ + + if (!IS_BLANKZ(parser->buffer)) { + yaml_parser_set_scanner_error(parser, "while scanning a directive", + start_mark, "found unexpected non-alphabetical character"); + goto error; + } + + *name = string.start; + + return 1; + +error: + STRING_DEL(parser, string); + return 0; +} + +/* + * Scan the value of VERSION-DIRECTIVE. + * + * Scope: + * %YAML 1.1 # a comment \n + * ^^^^^^ + */ + +static int +yaml_parser_scan_version_directive_value(yaml_parser_t *parser, + yaml_mark_t start_mark, int *major, int *minor) +{ + /* Eat whitespaces. */ + + if (!CACHE(parser, 1)) return 0; + + while (IS_BLANK(parser->buffer)) { + SKIP(parser); + if (!CACHE(parser, 1)) return 0; + } + + /* Consume the major version number. */ + + if (!yaml_parser_scan_version_directive_number(parser, start_mark, major)) + return 0; + + /* Eat '.'. */ + + if (!CHECK(parser->buffer, '.')) { + return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive", + start_mark, "did not find expected digit or '.' character"); + } + + SKIP(parser); + + /* Consume the minor version number. */ + + if (!yaml_parser_scan_version_directive_number(parser, start_mark, minor)) + return 0; + + return 1; +} + +#define MAX_NUMBER_LENGTH 9 + +/* + * Scan the version number of VERSION-DIRECTIVE. + * + * Scope: + * %YAML 1.1 # a comment \n + * ^ + * %YAML 1.1 # a comment \n + * ^ + */ + +static int +yaml_parser_scan_version_directive_number(yaml_parser_t *parser, + yaml_mark_t start_mark, int *number) +{ + int value = 0; + size_t length = 0; + + /* Repeat while the next character is digit. */ + + if (!CACHE(parser, 1)) return 0; + + while (IS_DIGIT(parser->buffer)) + { + /* Check if the number is too long. */ + + if (++length > MAX_NUMBER_LENGTH) { + return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive", + start_mark, "found extremely long version number"); + } + + value = value*10 + AS_DIGIT(parser->buffer); + + SKIP(parser); + + if (!CACHE(parser, 1)) return 0; + } + + /* Check if the number was present. */ + + if (!length) { + return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive", + start_mark, "did not find expected version number"); + } + + *number = value; + + return 1; +} + +/* + * Scan the value of a TAG-DIRECTIVE token. + * + * Scope: + * %TAG !yaml! tag:yaml.org,2002: \n + * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + */ + +static int +yaml_parser_scan_tag_directive_value(yaml_parser_t *parser, + yaml_mark_t start_mark, yaml_char_t **handle, yaml_char_t **prefix) +{ + yaml_char_t *handle_value = NULL; + yaml_char_t *prefix_value = NULL; + + /* Eat whitespaces. */ + + if (!CACHE(parser, 1)) goto error; + + while (IS_BLANK(parser->buffer)) { + SKIP(parser); + if (!CACHE(parser, 1)) goto error; + } + + /* Scan a handle. */ + + if (!yaml_parser_scan_tag_handle(parser, 1, start_mark, &handle_value)) + goto error; + + /* Expect a whitespace. */ + + if (!CACHE(parser, 1)) goto error; + + if (!IS_BLANK(parser->buffer)) { + yaml_parser_set_scanner_error(parser, "while scanning a %TAG directive", + start_mark, "did not find expected whitespace"); + goto error; + } + + /* Eat whitespaces. */ + + while (IS_BLANK(parser->buffer)) { + SKIP(parser); + if (!CACHE(parser, 1)) goto error; + } + + /* Scan a prefix. */ + + if (!yaml_parser_scan_tag_uri(parser, 1, NULL, start_mark, &prefix_value)) + goto error; + + /* Expect a whitespace or line break. */ + + if (!CACHE(parser, 1)) goto error; + + if (!IS_BLANKZ(parser->buffer)) { + yaml_parser_set_scanner_error(parser, "while scanning a %TAG directive", + start_mark, "did not find expected whitespace or line break"); + goto error; + } + + *handle = handle_value; + *prefix = prefix_value; + + return 1; + +error: + yaml_free(handle_value); + yaml_free(prefix_value); + return 0; +} + +static int +yaml_parser_scan_anchor(yaml_parser_t *parser, yaml_token_t *token, + yaml_token_type_t type) +{ + int length = 0; + yaml_mark_t start_mark, end_mark; + yaml_string_t string = NULL_STRING; + + if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error; + + /* Eat the indicator character. */ + + start_mark = parser->mark; + + SKIP(parser); + + /* Consume the value. */ + + if (!CACHE(parser, 1)) goto error; + + while (IS_ALPHA(parser->buffer)) { + if (!READ(parser, string)) goto error; + if (!CACHE(parser, 1)) goto error; + length ++; + } + + end_mark = parser->mark; + + /* + * Check if length of the anchor is greater than 0 and it is followed by + * a whitespace character or one of the indicators: + * + * '?', ':', ',', ']', '}', '%', '@', '`'. + */ + + if (!length || !(IS_BLANKZ(parser->buffer) || CHECK(parser->buffer, '?') + || CHECK(parser->buffer, ':') || CHECK(parser->buffer, ',') + || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '}') + || CHECK(parser->buffer, '%') || CHECK(parser->buffer, '@') + || CHECK(parser->buffer, '`'))) { + yaml_parser_set_scanner_error(parser, type == YAML_ANCHOR_TOKEN ? + "while scanning an anchor" : "while scanning an alias", start_mark, + "did not find expected alphabetic or numeric character"); + goto error; + } + + /* Create a token. */ + + if (type == YAML_ANCHOR_TOKEN) { + ANCHOR_TOKEN_INIT(*token, string.start, start_mark, end_mark); + } + else { + ALIAS_TOKEN_INIT(*token, string.start, start_mark, end_mark); + } + + return 1; + +error: + STRING_DEL(parser, string); + return 0; +} + +/* + * Scan a TAG token. + */ + +static int +yaml_parser_scan_tag(yaml_parser_t *parser, yaml_token_t *token) +{ + yaml_char_t *handle = NULL; + yaml_char_t *suffix = NULL; + yaml_mark_t start_mark, end_mark; + + start_mark = parser->mark; + + /* Check if the tag is in the canonical form. */ + + if (!CACHE(parser, 2)) goto error; + + if (CHECK_AT(parser->buffer, '<', 1)) + { + /* Set the handle to '' */ + + handle = yaml_malloc(1); + if (!handle) goto error; + handle[0] = '\0'; + + /* Eat '!<' */ + + SKIP(parser); + SKIP(parser); + + /* Consume the tag value. */ + + if (!yaml_parser_scan_tag_uri(parser, 0, NULL, start_mark, &suffix)) + goto error; + + /* Check for '>' and eat it. */ + + if (!CHECK(parser->buffer, '>')) { + yaml_parser_set_scanner_error(parser, "while scanning a tag", + start_mark, "did not find the expected '>'"); + goto error; + } + + SKIP(parser); + } + else + { + /* The tag has either the '!suffix' or the '!handle!suffix' form. */ + + /* First, try to scan a handle. */ + + if (!yaml_parser_scan_tag_handle(parser, 0, start_mark, &handle)) + goto error; + + /* Check if it is, indeed, handle. */ + + if (handle[0] == '!' && handle[1] != '\0' && handle[strlen((char *)handle)-1] == '!') + { + /* Scan the suffix now. */ + + if (!yaml_parser_scan_tag_uri(parser, 0, NULL, start_mark, &suffix)) + goto error; + } + else + { + /* It wasn't a handle after all. Scan the rest of the tag. */ + + if (!yaml_parser_scan_tag_uri(parser, 0, handle, start_mark, &suffix)) + goto error; + + /* Set the handle to '!'. */ + + yaml_free(handle); + handle = yaml_malloc(2); + if (!handle) goto error; + handle[0] = '!'; + handle[1] = '\0'; + + /* + * A special case: the '!' tag. Set the handle to '' and the + * suffix to '!'. + */ + + if (suffix[0] == '\0') { + yaml_char_t *tmp = handle; + handle = suffix; + suffix = tmp; + } + } + } + + /* Check the character which ends the tag. */ + + if (!CACHE(parser, 1)) goto error; + + if (!IS_BLANKZ(parser->buffer)) { + yaml_parser_set_scanner_error(parser, "while scanning a tag", + start_mark, "did not find expected whitespace or line break"); + goto error; + } + + end_mark = parser->mark; + + /* Create a token. */ + + TAG_TOKEN_INIT(*token, handle, suffix, start_mark, end_mark); + + return 1; + +error: + yaml_free(handle); + yaml_free(suffix); + return 0; +} + +/* + * Scan a tag handle. + */ + +static int +yaml_parser_scan_tag_handle(yaml_parser_t *parser, int directive, + yaml_mark_t start_mark, yaml_char_t **handle) +{ + yaml_string_t string = NULL_STRING; + + if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error; + + /* Check the initial '!' character. */ + + if (!CACHE(parser, 1)) goto error; + + if (!CHECK(parser->buffer, '!')) { + yaml_parser_set_scanner_error(parser, directive ? + "while scanning a tag directive" : "while scanning a tag", + start_mark, "did not find expected '!'"); + goto error; + } + + /* Copy the '!' character. */ + + if (!READ(parser, string)) goto error; + + /* Copy all subsequent alphabetical and numerical characters. */ + + if (!CACHE(parser, 1)) goto error; + + while (IS_ALPHA(parser->buffer)) + { + if (!READ(parser, string)) goto error; + if (!CACHE(parser, 1)) goto error; + } + + /* Check if the trailing character is '!' and copy it. */ + + if (CHECK(parser->buffer, '!')) + { + if (!READ(parser, string)) goto error; + } + else + { + /* + * It's either the '!' tag or not really a tag handle. If it's a %TAG + * directive, it's an error. If it's a tag token, it must be a part of + * URI. + */ + + if (directive && !(string.start[0] == '!' && string.start[1] == '\0')) { + yaml_parser_set_scanner_error(parser, "while parsing a tag directive", + start_mark, "did not find expected '!'"); + goto error; + } + } + + *handle = string.start; + + return 1; + +error: + STRING_DEL(parser, string); + return 0; +} + +/* + * Scan a tag. + */ + +static int +yaml_parser_scan_tag_uri(yaml_parser_t *parser, int directive, + yaml_char_t *head, yaml_mark_t start_mark, yaml_char_t **uri) +{ + size_t length = head ? strlen((char *)head) : 0; + yaml_string_t string = NULL_STRING; + + if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error; + + /* Resize the string to include the head. */ + + while (string.end - string.start <= (int)length) { + if (!yaml_string_extend(&string.start, &string.pointer, &string.end)) { + parser->error = YAML_MEMORY_ERROR; + goto error; + } + } + + /* + * Copy the head if needed. + * + * Note that we don't copy the leading '!' character. + */ + + if (length > 1) { + memcpy(string.start, head+1, length-1); + string.pointer += length-1; + } + + /* Scan the tag. */ + + if (!CACHE(parser, 1)) goto error; + + /* + * The set of characters that may appear in URI is as follows: + * + * '0'-'9', 'A'-'Z', 'a'-'z', '_', '-', ';', '/', '?', ':', '@', '&', + * '=', '+', '$', ',', '.', '!', '~', '*', '\'', '(', ')', '[', ']', + * '%'. + */ + + while (IS_ALPHA(parser->buffer) || CHECK(parser->buffer, ';') + || CHECK(parser->buffer, '/') || CHECK(parser->buffer, '?') + || CHECK(parser->buffer, ':') || CHECK(parser->buffer, '@') + || CHECK(parser->buffer, '&') || CHECK(parser->buffer, '=') + || CHECK(parser->buffer, '+') || CHECK(parser->buffer, '$') + || CHECK(parser->buffer, ',') || CHECK(parser->buffer, '.') + || CHECK(parser->buffer, '!') || CHECK(parser->buffer, '~') + || CHECK(parser->buffer, '*') || CHECK(parser->buffer, '\'') + || CHECK(parser->buffer, '(') || CHECK(parser->buffer, ')') + || CHECK(parser->buffer, '[') || CHECK(parser->buffer, ']') + || CHECK(parser->buffer, '%')) + { + /* Check if it is a URI-escape sequence. */ + + if (CHECK(parser->buffer, '%')) { + if (!yaml_parser_scan_uri_escapes(parser, + directive, start_mark, &string)) goto error; + } + else { + if (!READ(parser, string)) goto error; + } + + length ++; + if (!CACHE(parser, 1)) goto error; + } + + /* Check if the tag is non-empty. */ + + if (!length) { + if (!STRING_EXTEND(parser, string)) + goto error; + + yaml_parser_set_scanner_error(parser, directive ? + "while parsing a %TAG directive" : "while parsing a tag", + start_mark, "did not find expected tag URI"); + goto error; + } + + *uri = string.start; + + return 1; + +error: + STRING_DEL(parser, string); + return 0; +} + +/* + * Decode an URI-escape sequence corresponding to a single UTF-8 character. + */ + +static int +yaml_parser_scan_uri_escapes(yaml_parser_t *parser, int directive, + yaml_mark_t start_mark, yaml_string_t *string) +{ + int width = 0; + + /* Decode the required number of characters. */ + + do { + + unsigned char octet = 0; + + /* Check for a URI-escaped octet. */ + + if (!CACHE(parser, 3)) return 0; + + if (!(CHECK(parser->buffer, '%') + && IS_HEX_AT(parser->buffer, 1) + && IS_HEX_AT(parser->buffer, 2))) { + return yaml_parser_set_scanner_error(parser, directive ? + "while parsing a %TAG directive" : "while parsing a tag", + start_mark, "did not find URI escaped octet"); + } + + /* Get the octet. */ + + octet = (AS_HEX_AT(parser->buffer, 1) << 4) + AS_HEX_AT(parser->buffer, 2); + + /* If it is the leading octet, determine the length of the UTF-8 sequence. */ + + if (!width) + { + width = (octet & 0x80) == 0x00 ? 1 : + (octet & 0xE0) == 0xC0 ? 2 : + (octet & 0xF0) == 0xE0 ? 3 : + (octet & 0xF8) == 0xF0 ? 4 : 0; + if (!width) { + return yaml_parser_set_scanner_error(parser, directive ? + "while parsing a %TAG directive" : "while parsing a tag", + start_mark, "found an incorrect leading UTF-8 octet"); + } + } + else + { + /* Check if the trailing octet is correct. */ + + if ((octet & 0xC0) != 0x80) { + return yaml_parser_set_scanner_error(parser, directive ? + "while parsing a %TAG directive" : "while parsing a tag", + start_mark, "found an incorrect trailing UTF-8 octet"); + } + } + + /* Copy the octet and move the pointers. */ + + *(string->pointer++) = octet; + SKIP(parser); + SKIP(parser); + SKIP(parser); + + } while (--width); + + return 1; +} + +/* + * Scan a block scalar. + */ + +static int +yaml_parser_scan_block_scalar(yaml_parser_t *parser, yaml_token_t *token, + int literal) +{ + yaml_mark_t start_mark; + yaml_mark_t end_mark; + yaml_string_t string = NULL_STRING; + yaml_string_t leading_break = NULL_STRING; + yaml_string_t trailing_breaks = NULL_STRING; + int chomping = 0; + int increment = 0; + int indent = 0; + int leading_blank = 0; + int trailing_blank = 0; + + if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error; + if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error; + if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error; + + /* Eat the indicator '|' or '>'. */ + + start_mark = parser->mark; + + SKIP(parser); + + /* Scan the additional block scalar indicators. */ + + if (!CACHE(parser, 1)) goto error; + + /* Check for a chomping indicator. */ + + if (CHECK(parser->buffer, '+') || CHECK(parser->buffer, '-')) + { + /* Set the chomping method and eat the indicator. */ + + chomping = CHECK(parser->buffer, '+') ? +1 : -1; + + SKIP(parser); + + /* Check for an indentation indicator. */ + + if (!CACHE(parser, 1)) goto error; + + if (IS_DIGIT(parser->buffer)) + { + /* Check that the intendation is greater than 0. */ + + if (CHECK(parser->buffer, '0')) { + yaml_parser_set_scanner_error(parser, "while scanning a block scalar", + start_mark, "found an intendation indicator equal to 0"); + goto error; + } + + /* Get the intendation level and eat the indicator. */ + + increment = AS_DIGIT(parser->buffer); + + SKIP(parser); + } + } + + /* Do the same as above, but in the opposite order. */ + + else if (IS_DIGIT(parser->buffer)) + { + if (CHECK(parser->buffer, '0')) { + yaml_parser_set_scanner_error(parser, "while scanning a block scalar", + start_mark, "found an intendation indicator equal to 0"); + goto error; + } + + increment = AS_DIGIT(parser->buffer); + + SKIP(parser); + + if (!CACHE(parser, 1)) goto error; + + if (CHECK(parser->buffer, '+') || CHECK(parser->buffer, '-')) { + chomping = CHECK(parser->buffer, '+') ? +1 : -1; + + SKIP(parser); + } + } + + /* Eat whitespaces and comments to the end of the line. */ + + if (!CACHE(parser, 1)) goto error; + + while (IS_BLANK(parser->buffer)) { + SKIP(parser); + if (!CACHE(parser, 1)) goto error; + } + + if (CHECK(parser->buffer, '#')) { + while (!IS_BREAKZ(parser->buffer)) { + SKIP(parser); + if (!CACHE(parser, 1)) goto error; + } + } + + /* Check if we are at the end of the line. */ + + if (!IS_BREAKZ(parser->buffer)) { + yaml_parser_set_scanner_error(parser, "while scanning a block scalar", + start_mark, "did not find expected comment or line break"); + goto error; + } + + /* Eat a line break. */ + + if (IS_BREAK(parser->buffer)) { + if (!CACHE(parser, 2)) goto error; + SKIP_LINE(parser); + } + + end_mark = parser->mark; + + /* Set the intendation level if it was specified. */ + + if (increment) { + indent = parser->indent >= 0 ? parser->indent+increment : increment; + } + + /* Scan the leading line breaks and determine the indentation level if needed. */ + + if (!yaml_parser_scan_block_scalar_breaks(parser, &indent, &trailing_breaks, + start_mark, &end_mark)) goto error; + + /* Scan the block scalar content. */ + + if (!CACHE(parser, 1)) goto error; + + while ((int)parser->mark.column == indent && !IS_Z(parser->buffer)) + { + /* + * We are at the beginning of a non-empty line. + */ + + /* Is it a trailing whitespace? */ + + trailing_blank = IS_BLANK(parser->buffer); + + /* Check if we need to fold the leading line break. */ + + if (!literal && (*leading_break.start == '\n') + && !leading_blank && !trailing_blank) + { + /* Do we need to join the lines by space? */ + + if (*trailing_breaks.start == '\0') { + if (!STRING_EXTEND(parser, string)) goto error; + *(string.pointer ++) = ' '; + } + + CLEAR(parser, leading_break); + } + else { + if (!JOIN(parser, string, leading_break)) goto error; + CLEAR(parser, leading_break); + } + + /* Append the remaining line breaks. */ + + if (!JOIN(parser, string, trailing_breaks)) goto error; + CLEAR(parser, trailing_breaks); + + /* Is it a leading whitespace? */ + + leading_blank = IS_BLANK(parser->buffer); + + /* Consume the current line. */ + + while (!IS_BREAKZ(parser->buffer)) { + if (!READ(parser, string)) goto error; + if (!CACHE(parser, 1)) goto error; + } + + /* Consume the line break. */ + + if (!CACHE(parser, 2)) goto error; + + if (!READ_LINE(parser, leading_break)) goto error; + + /* Eat the following intendation spaces and line breaks. */ + + if (!yaml_parser_scan_block_scalar_breaks(parser, + &indent, &trailing_breaks, start_mark, &end_mark)) goto error; + } + + /* Chomp the tail. */ + + if (chomping != -1) { + if (!JOIN(parser, string, leading_break)) goto error; + } + if (chomping == 1) { + if (!JOIN(parser, string, trailing_breaks)) goto error; + } + + /* Create a token. */ + + SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start, + literal ? YAML_LITERAL_SCALAR_STYLE : YAML_FOLDED_SCALAR_STYLE, + start_mark, end_mark); + + STRING_DEL(parser, leading_break); + STRING_DEL(parser, trailing_breaks); + + return 1; + +error: + STRING_DEL(parser, string); + STRING_DEL(parser, leading_break); + STRING_DEL(parser, trailing_breaks); + + return 0; +} + +/* + * Scan intendation spaces and line breaks for a block scalar. Determine the + * intendation level if needed. + */ + +static int +yaml_parser_scan_block_scalar_breaks(yaml_parser_t *parser, + int *indent, yaml_string_t *breaks, + yaml_mark_t start_mark, yaml_mark_t *end_mark) +{ + int max_indent = 0; + + *end_mark = parser->mark; + + /* Eat the intendation spaces and line breaks. */ + + while (1) + { + /* Eat the intendation spaces. */ + + if (!CACHE(parser, 1)) return 0; + + while ((!*indent || (int)parser->mark.column < *indent) + && IS_SPACE(parser->buffer)) { + SKIP(parser); + if (!CACHE(parser, 1)) return 0; + } + + if ((int)parser->mark.column > max_indent) + max_indent = (int)parser->mark.column; + + /* Check for a tab character messing the intendation. */ + + if ((!*indent || (int)parser->mark.column < *indent) + && IS_TAB(parser->buffer)) { + return yaml_parser_set_scanner_error(parser, "while scanning a block scalar", + start_mark, "found a tab character where an intendation space is expected"); + } + + /* Have we found a non-empty line? */ + + if (!IS_BREAK(parser->buffer)) break; + + /* Consume the line break. */ + + if (!CACHE(parser, 2)) return 0; + if (!READ_LINE(parser, *breaks)) return 0; + *end_mark = parser->mark; + } + + /* Determine the indentation level if needed. */ + + if (!*indent) { + *indent = max_indent; + if (*indent < parser->indent + 1) + *indent = parser->indent + 1; + if (*indent < 1) + *indent = 1; + } + + return 1; +} + +/* + * Scan a quoted scalar. + */ + +static int +yaml_parser_scan_flow_scalar(yaml_parser_t *parser, yaml_token_t *token, + int single) +{ + yaml_mark_t start_mark; + yaml_mark_t end_mark; + yaml_string_t string = NULL_STRING; + yaml_string_t leading_break = NULL_STRING; + yaml_string_t trailing_breaks = NULL_STRING; + yaml_string_t whitespaces = NULL_STRING; + int leading_blanks; + + if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error; + if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error; + if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error; + if (!STRING_INIT(parser, whitespaces, INITIAL_STRING_SIZE)) goto error; + + /* Eat the left quote. */ + + start_mark = parser->mark; + + SKIP(parser); + + /* Consume the content of the quoted scalar. */ + + while (1) + { + /* Check that there are no document indicators at the beginning of the line. */ + + if (!CACHE(parser, 4)) goto error; + + if (parser->mark.column == 0 && + ((CHECK_AT(parser->buffer, '-', 0) && + CHECK_AT(parser->buffer, '-', 1) && + CHECK_AT(parser->buffer, '-', 2)) || + (CHECK_AT(parser->buffer, '.', 0) && + CHECK_AT(parser->buffer, '.', 1) && + CHECK_AT(parser->buffer, '.', 2))) && + IS_BLANKZ_AT(parser->buffer, 3)) + { + yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar", + start_mark, "found unexpected document indicator"); + goto error; + } + + /* Check for EOF. */ + + if (IS_Z(parser->buffer)) { + yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar", + start_mark, "found unexpected end of stream"); + goto error; + } + + /* Consume non-blank characters. */ + + if (!CACHE(parser, 2)) goto error; + + leading_blanks = 0; + + while (!IS_BLANKZ(parser->buffer)) + { + /* Check for an escaped single quote. */ + + if (single && CHECK_AT(parser->buffer, '\'', 0) + && CHECK_AT(parser->buffer, '\'', 1)) + { + if (!STRING_EXTEND(parser, string)) goto error; + *(string.pointer++) = '\''; + SKIP(parser); + SKIP(parser); + } + + /* Check for the right quote. */ + + else if (CHECK(parser->buffer, single ? '\'' : '"')) + { + break; + } + + /* Check for an escaped line break. */ + + else if (!single && CHECK(parser->buffer, '\\') + && IS_BREAK_AT(parser->buffer, 1)) + { + if (!CACHE(parser, 3)) goto error; + SKIP(parser); + SKIP_LINE(parser); + leading_blanks = 1; + break; + } + + /* Check for an escape sequence. */ + + else if (!single && CHECK(parser->buffer, '\\')) + { + size_t code_length = 0; + + if (!STRING_EXTEND(parser, string)) goto error; + + /* Check the escape character. */ + + switch (parser->buffer.pointer[1]) + { + case '0': + *(string.pointer++) = '\0'; + break; + + case 'a': + *(string.pointer++) = '\x07'; + break; + + case 'b': + *(string.pointer++) = '\x08'; + break; + + case 't': + case '\t': + *(string.pointer++) = '\x09'; + break; + + case 'n': + *(string.pointer++) = '\x0A'; + break; + + case 'v': + *(string.pointer++) = '\x0B'; + break; + + case 'f': + *(string.pointer++) = '\x0C'; + break; + + case 'r': + *(string.pointer++) = '\x0D'; + break; + + case 'e': + *(string.pointer++) = '\x1B'; + break; + + case ' ': + *(string.pointer++) = '\x20'; + break; + + case '"': + *(string.pointer++) = '"'; + break; + + case '\'': + *(string.pointer++) = '\''; + break; + + case '\\': + *(string.pointer++) = '\\'; + break; + + case 'N': /* NEL (#x85) */ + *(string.pointer++) = '\xC2'; + *(string.pointer++) = '\x85'; + break; + + case '_': /* #xA0 */ + *(string.pointer++) = '\xC2'; + *(string.pointer++) = '\xA0'; + break; + + case 'L': /* LS (#x2028) */ + *(string.pointer++) = '\xE2'; + *(string.pointer++) = '\x80'; + *(string.pointer++) = '\xA8'; + break; + + case 'P': /* PS (#x2029) */ + *(string.pointer++) = '\xE2'; + *(string.pointer++) = '\x80'; + *(string.pointer++) = '\xA9'; + break; + + case 'x': + code_length = 2; + break; + + case 'u': + code_length = 4; + break; + + case 'U': + code_length = 8; + break; + + default: + yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar", + start_mark, "found unknown escape character"); + goto error; + } + + SKIP(parser); + SKIP(parser); + + /* Consume an arbitrary escape code. */ + + if (code_length) + { + unsigned int value = 0; + size_t k; + + /* Scan the character value. */ + + if (!CACHE(parser, code_length)) goto error; + + for (k = 0; k < code_length; k ++) { + if (!IS_HEX_AT(parser->buffer, k)) { + yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar", + start_mark, "did not find expected hexdecimal number"); + goto error; + } + value = (value << 4) + AS_HEX_AT(parser->buffer, k); + } + + /* Check the value and write the character. */ + + if ((value >= 0xD800 && value <= 0xDFFF) || value > 0x10FFFF) { + yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar", + start_mark, "found invalid Unicode character escape code"); + goto error; + } + + if (value <= 0x7F) { + *(string.pointer++) = value; + } + else if (value <= 0x7FF) { + *(string.pointer++) = 0xC0 + (value >> 6); + *(string.pointer++) = 0x80 + (value & 0x3F); + } + else if (value <= 0xFFFF) { + *(string.pointer++) = 0xE0 + (value >> 12); + *(string.pointer++) = 0x80 + ((value >> 6) & 0x3F); + *(string.pointer++) = 0x80 + (value & 0x3F); + } + else { + *(string.pointer++) = 0xF0 + (value >> 18); + *(string.pointer++) = 0x80 + ((value >> 12) & 0x3F); + *(string.pointer++) = 0x80 + ((value >> 6) & 0x3F); + *(string.pointer++) = 0x80 + (value & 0x3F); + } + + /* Advance the pointer. */ + + for (k = 0; k < code_length; k ++) { + SKIP(parser); + } + } + } + + else + { + /* It is a non-escaped non-blank character. */ + + if (!READ(parser, string)) goto error; + } + + if (!CACHE(parser, 2)) goto error; + } + + /* Check if we are at the end of the scalar. */ + + if (CHECK(parser->buffer, single ? '\'' : '"')) + break; + + /* Consume blank characters. */ + + if (!CACHE(parser, 1)) goto error; + + while (IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer)) + { + if (IS_BLANK(parser->buffer)) + { + /* Consume a space or a tab character. */ + + if (!leading_blanks) { + if (!READ(parser, whitespaces)) goto error; + } + else { + SKIP(parser); + } + } + else + { + if (!CACHE(parser, 2)) goto error; + + /* Check if it is a first line break. */ + + if (!leading_blanks) + { + CLEAR(parser, whitespaces); + if (!READ_LINE(parser, leading_break)) goto error; + leading_blanks = 1; + } + else + { + if (!READ_LINE(parser, trailing_breaks)) goto error; + } + } + if (!CACHE(parser, 1)) goto error; + } + + /* Join the whitespaces or fold line breaks. */ + + if (leading_blanks) + { + /* Do we need to fold line breaks? */ + + if (leading_break.start[0] == '\n') { + if (trailing_breaks.start[0] == '\0') { + if (!STRING_EXTEND(parser, string)) goto error; + *(string.pointer++) = ' '; + } + else { + if (!JOIN(parser, string, trailing_breaks)) goto error; + CLEAR(parser, trailing_breaks); + } + CLEAR(parser, leading_break); + } + else { + if (!JOIN(parser, string, leading_break)) goto error; + if (!JOIN(parser, string, trailing_breaks)) goto error; + CLEAR(parser, leading_break); + CLEAR(parser, trailing_breaks); + } + } + else + { + if (!JOIN(parser, string, whitespaces)) goto error; + CLEAR(parser, whitespaces); + } + } + + /* Eat the right quote. */ + + SKIP(parser); + + end_mark = parser->mark; + + /* Create a token. */ + + SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start, + single ? YAML_SINGLE_QUOTED_SCALAR_STYLE : YAML_DOUBLE_QUOTED_SCALAR_STYLE, + start_mark, end_mark); + + STRING_DEL(parser, leading_break); + STRING_DEL(parser, trailing_breaks); + STRING_DEL(parser, whitespaces); + + return 1; + +error: + STRING_DEL(parser, string); + STRING_DEL(parser, leading_break); + STRING_DEL(parser, trailing_breaks); + STRING_DEL(parser, whitespaces); + + return 0; +} + +/* + * Scan a plain scalar. + */ + +static int +yaml_parser_scan_plain_scalar(yaml_parser_t *parser, yaml_token_t *token) +{ + yaml_mark_t start_mark; + yaml_mark_t end_mark; + yaml_string_t string = NULL_STRING; + yaml_string_t leading_break = NULL_STRING; + yaml_string_t trailing_breaks = NULL_STRING; + yaml_string_t whitespaces = NULL_STRING; + int leading_blanks = 0; + int indent = parser->indent+1; + + if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error; + if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error; + if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error; + if (!STRING_INIT(parser, whitespaces, INITIAL_STRING_SIZE)) goto error; + + start_mark = end_mark = parser->mark; + + /* Consume the content of the plain scalar. */ + + while (1) + { + /* Check for a document indicator. */ + + if (!CACHE(parser, 4)) goto error; + + if (parser->mark.column == 0 && + ((CHECK_AT(parser->buffer, '-', 0) && + CHECK_AT(parser->buffer, '-', 1) && + CHECK_AT(parser->buffer, '-', 2)) || + (CHECK_AT(parser->buffer, '.', 0) && + CHECK_AT(parser->buffer, '.', 1) && + CHECK_AT(parser->buffer, '.', 2))) && + IS_BLANKZ_AT(parser->buffer, 3)) break; + + /* Check for a comment. */ + + if (CHECK(parser->buffer, '#')) + break; + + /* Consume non-blank characters. */ + + while (!IS_BLANKZ(parser->buffer)) + { + /* Check for 'x:x' in the flow context. TODO: Fix the test "spec-08-13". */ + + if (parser->flow_level + && CHECK(parser->buffer, ':') + && !IS_BLANKZ_AT(parser->buffer, 1)) { + yaml_parser_set_scanner_error(parser, "while scanning a plain scalar", + start_mark, "found unexpected ':'"); + goto error; + } + + /* Check for indicators that may end a plain scalar. */ + + if ((CHECK(parser->buffer, ':') && IS_BLANKZ_AT(parser->buffer, 1)) + || (parser->flow_level && + (CHECK(parser->buffer, ',') || CHECK(parser->buffer, ':') + || CHECK(parser->buffer, '?') || CHECK(parser->buffer, '[') + || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '{') + || CHECK(parser->buffer, '}')))) + break; + + /* Check if we need to join whitespaces and breaks. */ + + if (leading_blanks || whitespaces.start != whitespaces.pointer) + { + if (leading_blanks) + { + /* Do we need to fold line breaks? */ + + if (leading_break.start[0] == '\n') { + if (trailing_breaks.start[0] == '\0') { + if (!STRING_EXTEND(parser, string)) goto error; + *(string.pointer++) = ' '; + } + else { + if (!JOIN(parser, string, trailing_breaks)) goto error; + CLEAR(parser, trailing_breaks); + } + CLEAR(parser, leading_break); + } + else { + if (!JOIN(parser, string, leading_break)) goto error; + if (!JOIN(parser, string, trailing_breaks)) goto error; + CLEAR(parser, leading_break); + CLEAR(parser, trailing_breaks); + } + + leading_blanks = 0; + } + else + { + if (!JOIN(parser, string, whitespaces)) goto error; + CLEAR(parser, whitespaces); + } + } + + /* Copy the character. */ + + if (!READ(parser, string)) goto error; + + end_mark = parser->mark; + + if (!CACHE(parser, 2)) goto error; + } + + /* Is it the end? */ + + if (!(IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer))) + break; + + /* Consume blank characters. */ + + if (!CACHE(parser, 1)) goto error; + + while (IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer)) + { + if (IS_BLANK(parser->buffer)) + { + /* Check for tab character that abuse intendation. */ + + if (leading_blanks && (int)parser->mark.column < indent + && IS_TAB(parser->buffer)) { + yaml_parser_set_scanner_error(parser, "while scanning a plain scalar", + start_mark, "found a tab character that violate intendation"); + goto error; + } + + /* Consume a space or a tab character. */ + + if (!leading_blanks) { + if (!READ(parser, whitespaces)) goto error; + } + else { + SKIP(parser); + } + } + else + { + if (!CACHE(parser, 2)) goto error; + + /* Check if it is a first line break. */ + + if (!leading_blanks) + { + CLEAR(parser, whitespaces); + if (!READ_LINE(parser, leading_break)) goto error; + leading_blanks = 1; + } + else + { + if (!READ_LINE(parser, trailing_breaks)) goto error; + } + } + if (!CACHE(parser, 1)) goto error; + } + + /* Check intendation level. */ + + if (!parser->flow_level && (int)parser->mark.column < indent) + break; + } + + /* Create a token. */ + + SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start, + YAML_PLAIN_SCALAR_STYLE, start_mark, end_mark); + + /* Note that we change the 'simple_key_allowed' flag. */ + + if (leading_blanks) { + parser->simple_key_allowed = 1; + } + + STRING_DEL(parser, leading_break); + STRING_DEL(parser, trailing_breaks); + STRING_DEL(parser, whitespaces); + + return 1; + +error: + STRING_DEL(parser, string); + STRING_DEL(parser, leading_break); + STRING_DEL(parser, trailing_breaks); + STRING_DEL(parser, whitespaces); + + return 0; +} + diff --git a/ext/psych/yaml/writer.c b/ext/psych/yaml/writer.c new file mode 100644 index 0000000000..b90019f5cb --- /dev/null +++ b/ext/psych/yaml/writer.c @@ -0,0 +1,141 @@ + +#include "yaml_private.h" + +/* + * Declarations. + */ + +static int +yaml_emitter_set_writer_error(yaml_emitter_t *emitter, const char *problem); + +YAML_DECLARE(int) +yaml_emitter_flush(yaml_emitter_t *emitter); + +/* + * Set the writer error and return 0. + */ + +static int +yaml_emitter_set_writer_error(yaml_emitter_t *emitter, const char *problem) +{ + emitter->error = YAML_WRITER_ERROR; + emitter->problem = problem; + + return 0; +} + +/* + * Flush the output buffer. + */ + +YAML_DECLARE(int) +yaml_emitter_flush(yaml_emitter_t *emitter) +{ + int low, high; + + assert(emitter); /* Non-NULL emitter object is expected. */ + assert(emitter->write_handler); /* Write handler must be set. */ + assert(emitter->encoding); /* Output encoding must be set. */ + + emitter->buffer.last = emitter->buffer.pointer; + emitter->buffer.pointer = emitter->buffer.start; + + /* Check if the buffer is empty. */ + + if (emitter->buffer.start == emitter->buffer.last) { + return 1; + } + + /* If the output encoding is UTF-8, we don't need to recode the buffer. */ + + if (emitter->encoding == YAML_UTF8_ENCODING) + { + if (emitter->write_handler(emitter->write_handler_data, + emitter->buffer.start, + emitter->buffer.last - emitter->buffer.start)) { + emitter->buffer.last = emitter->buffer.start; + emitter->buffer.pointer = emitter->buffer.start; + return 1; + } + else { + return yaml_emitter_set_writer_error(emitter, "write error"); + } + } + + /* Recode the buffer into the raw buffer. */ + + low = (emitter->encoding == YAML_UTF16LE_ENCODING ? 0 : 1); + high = (emitter->encoding == YAML_UTF16LE_ENCODING ? 1 : 0); + + while (emitter->buffer.pointer != emitter->buffer.last) + { + unsigned char octet; + unsigned int width; + unsigned int value; + size_t k; + + /* + * See the "reader.c" code for more details on UTF-8 encoding. Note + * that we assume that the buffer contains a valid UTF-8 sequence. + */ + + /* Read the next UTF-8 character. */ + + octet = emitter->buffer.pointer[0]; + + width = (octet & 0x80) == 0x00 ? 1 : + (octet & 0xE0) == 0xC0 ? 2 : + (octet & 0xF0) == 0xE0 ? 3 : + (octet & 0xF8) == 0xF0 ? 4 : 0; + + value = (octet & 0x80) == 0x00 ? octet & 0x7F : + (octet & 0xE0) == 0xC0 ? octet & 0x1F : + (octet & 0xF0) == 0xE0 ? octet & 0x0F : + (octet & 0xF8) == 0xF0 ? octet & 0x07 : 0; + + for (k = 1; k < width; k ++) { + octet = emitter->buffer.pointer[k]; + value = (value << 6) + (octet & 0x3F); + } + + emitter->buffer.pointer += width; + + /* Write the character. */ + + if (value < 0x10000) + { + emitter->raw_buffer.last[high] = value >> 8; + emitter->raw_buffer.last[low] = value & 0xFF; + + emitter->raw_buffer.last += 2; + } + else + { + /* Write the character using a surrogate pair (check "reader.c"). */ + + value -= 0x10000; + emitter->raw_buffer.last[high] = 0xD8 + (value >> 18); + emitter->raw_buffer.last[low] = (value >> 10) & 0xFF; + emitter->raw_buffer.last[high+2] = 0xDC + ((value >> 8) & 0xFF); + emitter->raw_buffer.last[low+2] = value & 0xFF; + + emitter->raw_buffer.last += 4; + } + } + + /* Write the raw buffer. */ + + if (emitter->write_handler(emitter->write_handler_data, + emitter->raw_buffer.start, + emitter->raw_buffer.last - emitter->raw_buffer.start)) { + emitter->buffer.last = emitter->buffer.start; + emitter->buffer.pointer = emitter->buffer.start; + emitter->raw_buffer.last = emitter->raw_buffer.start; + emitter->raw_buffer.pointer = emitter->raw_buffer.start; + return 1; + } + else { + return yaml_emitter_set_writer_error(emitter, "write error"); + } +} + diff --git a/ext/psych/yaml/yaml.h b/ext/psych/yaml/yaml.h new file mode 100644 index 0000000000..5a04d36d41 --- /dev/null +++ b/ext/psych/yaml/yaml.h @@ -0,0 +1,1971 @@ +/** + * @file yaml.h + * @brief Public interface for libyaml. + * + * Include the header file with the code: + * @code + * #include <yaml.h> + * @endcode + */ + +#ifndef YAML_H +#define YAML_H + +#ifdef __cplusplus +extern "C" { +#endif + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> + +/** + * @defgroup export Export Definitions + * @{ + */ + +/** The public API declaration. */ + +#ifdef _WIN32 +# if defined(YAML_DECLARE_STATIC) +# define YAML_DECLARE(type) type +# elif defined(YAML_DECLARE_EXPORT) +# define YAML_DECLARE(type) __declspec(dllexport) type +# else +# define YAML_DECLARE(type) __declspec(dllimport) type +# endif +#else +# define YAML_DECLARE(type) type +#endif + +/** @} */ + +/** + * @defgroup version Version Information + * @{ + */ + +/** + * Get the library version as a string. + * + * @returns The function returns the pointer to a static string of the form + * @c "X.Y.Z", where @c X is the major version number, @c Y is a minor version + * number, and @c Z is the patch version number. + */ + +YAML_DECLARE(const char *) +yaml_get_version_string(void); + +/** + * Get the library version numbers. + * + * @param[out] major Major version number. + * @param[out] minor Minor version number. + * @param[out] patch Patch version number. + */ + +YAML_DECLARE(void) +yaml_get_version(int *major, int *minor, int *patch); + +/** @} */ + +/** + * @defgroup basic Basic Types + * @{ + */ + +/** The character type (UTF-8 octet). */ +typedef unsigned char yaml_char_t; + +/** The version directive data. */ +typedef struct yaml_version_directive_s { + /** The major version number. */ + int major; + /** The minor version number. */ + int minor; +} yaml_version_directive_t; + +/** The tag directive data. */ +typedef struct yaml_tag_directive_s { + /** The tag handle. */ + yaml_char_t *handle; + /** The tag prefix. */ + yaml_char_t *prefix; +} yaml_tag_directive_t; + +/** The stream encoding. */ +typedef enum yaml_encoding_e { + /** Let the parser choose the encoding. */ + YAML_ANY_ENCODING, + /** The default UTF-8 encoding. */ + YAML_UTF8_ENCODING, + /** The UTF-16-LE encoding with BOM. */ + YAML_UTF16LE_ENCODING, + /** The UTF-16-BE encoding with BOM. */ + YAML_UTF16BE_ENCODING +} yaml_encoding_t; + +/** Line break types. */ + +typedef enum yaml_break_e { + /** Let the parser choose the break type. */ + YAML_ANY_BREAK, + /** Use CR for line breaks (Mac style). */ + YAML_CR_BREAK, + /** Use LN for line breaks (Unix style). */ + YAML_LN_BREAK, + /** Use CR LN for line breaks (DOS style). */ + YAML_CRLN_BREAK +} yaml_break_t; + +/** Many bad things could happen with the parser and emitter. */ +typedef enum yaml_error_type_e { + /** No error is produced. */ + YAML_NO_ERROR, + + /** Cannot allocate or reallocate a block of memory. */ + YAML_MEMORY_ERROR, + + /** Cannot read or decode the input stream. */ + YAML_READER_ERROR, + /** Cannot scan the input stream. */ + YAML_SCANNER_ERROR, + /** Cannot parse the input stream. */ + YAML_PARSER_ERROR, + /** Cannot compose a YAML document. */ + YAML_COMPOSER_ERROR, + + /** Cannot write to the output stream. */ + YAML_WRITER_ERROR, + /** Cannot emit a YAML stream. */ + YAML_EMITTER_ERROR +} yaml_error_type_t; + +/** The pointer position. */ +typedef struct yaml_mark_s { + /** The position index. */ + size_t index; + + /** The position line. */ + size_t line; + + /** The position column. */ + size_t column; +} yaml_mark_t; + +/** @} */ + +/** + * @defgroup styles Node Styles + * @{ + */ + +/** Scalar styles. */ +typedef enum yaml_scalar_style_e { + /** Let the emitter choose the style. */ + YAML_ANY_SCALAR_STYLE, + + /** The plain scalar style. */ + YAML_PLAIN_SCALAR_STYLE, + + /** The single-quoted scalar style. */ + YAML_SINGLE_QUOTED_SCALAR_STYLE, + /** The double-quoted scalar style. */ + YAML_DOUBLE_QUOTED_SCALAR_STYLE, + + /** The literal scalar style. */ + YAML_LITERAL_SCALAR_STYLE, + /** The folded scalar style. */ + YAML_FOLDED_SCALAR_STYLE +} yaml_scalar_style_t; + +/** Sequence styles. */ +typedef enum yaml_sequence_style_e { + /** Let the emitter choose the style. */ + YAML_ANY_SEQUENCE_STYLE, + + /** The block sequence style. */ + YAML_BLOCK_SEQUENCE_STYLE, + /** The flow sequence style. */ + YAML_FLOW_SEQUENCE_STYLE +} yaml_sequence_style_t; + +/** Mapping styles. */ +typedef enum yaml_mapping_style_e { + /** Let the emitter choose the style. */ + YAML_ANY_MAPPING_STYLE, + + /** The block mapping style. */ + YAML_BLOCK_MAPPING_STYLE, + /** The flow mapping style. */ + YAML_FLOW_MAPPING_STYLE +/* YAML_FLOW_SET_MAPPING_STYLE */ +} yaml_mapping_style_t; + +/** @} */ + +/** + * @defgroup tokens Tokens + * @{ + */ + +/** Token types. */ +typedef enum yaml_token_type_e { + /** An empty token. */ + YAML_NO_TOKEN, + + /** A STREAM-START token. */ + YAML_STREAM_START_TOKEN, + /** A STREAM-END token. */ + YAML_STREAM_END_TOKEN, + + /** A VERSION-DIRECTIVE token. */ + YAML_VERSION_DIRECTIVE_TOKEN, + /** A TAG-DIRECTIVE token. */ + YAML_TAG_DIRECTIVE_TOKEN, + /** A DOCUMENT-START token. */ + YAML_DOCUMENT_START_TOKEN, + /** A DOCUMENT-END token. */ + YAML_DOCUMENT_END_TOKEN, + + /** A BLOCK-SEQUENCE-START token. */ + YAML_BLOCK_SEQUENCE_START_TOKEN, + /** A BLOCK-SEQUENCE-END token. */ + YAML_BLOCK_MAPPING_START_TOKEN, + /** A BLOCK-END token. */ + YAML_BLOCK_END_TOKEN, + + /** A FLOW-SEQUENCE-START token. */ + YAML_FLOW_SEQUENCE_START_TOKEN, + /** A FLOW-SEQUENCE-END token. */ + YAML_FLOW_SEQUENCE_END_TOKEN, + /** A FLOW-MAPPING-START token. */ + YAML_FLOW_MAPPING_START_TOKEN, + /** A FLOW-MAPPING-END token. */ + YAML_FLOW_MAPPING_END_TOKEN, + + /** A BLOCK-ENTRY token. */ + YAML_BLOCK_ENTRY_TOKEN, + /** A FLOW-ENTRY token. */ + YAML_FLOW_ENTRY_TOKEN, + /** A KEY token. */ + YAML_KEY_TOKEN, + /** A VALUE token. */ + YAML_VALUE_TOKEN, + + /** An ALIAS token. */ + YAML_ALIAS_TOKEN, + /** An ANCHOR token. */ + YAML_ANCHOR_TOKEN, + /** A TAG token. */ + YAML_TAG_TOKEN, + /** A SCALAR token. */ + YAML_SCALAR_TOKEN +} yaml_token_type_t; + +/** The token structure. */ +typedef struct yaml_token_s { + + /** The token type. */ + yaml_token_type_t type; + + /** The token data. */ + union { + + /** The stream start (for @c YAML_STREAM_START_TOKEN). */ + struct { + /** The stream encoding. */ + yaml_encoding_t encoding; + } stream_start; + + /** The alias (for @c YAML_ALIAS_TOKEN). */ + struct { + /** The alias value. */ + yaml_char_t *value; + } alias; + + /** The anchor (for @c YAML_ANCHOR_TOKEN). */ + struct { + /** The anchor value. */ + yaml_char_t *value; + } anchor; + + /** The tag (for @c YAML_TAG_TOKEN). */ + struct { + /** The tag handle. */ + yaml_char_t *handle; + /** The tag suffix. */ + yaml_char_t *suffix; + } tag; + + /** The scalar value (for @c YAML_SCALAR_TOKEN). */ + struct { + /** The scalar value. */ + yaml_char_t *value; + /** The length of the scalar value. */ + size_t length; + /** The scalar style. */ + yaml_scalar_style_t style; + } scalar; + + /** The version directive (for @c YAML_VERSION_DIRECTIVE_TOKEN). */ + struct { + /** The major version number. */ + int major; + /** The minor version number. */ + int minor; + } version_directive; + + /** The tag directive (for @c YAML_TAG_DIRECTIVE_TOKEN). */ + struct { + /** The tag handle. */ + yaml_char_t *handle; + /** The tag prefix. */ + yaml_char_t *prefix; + } tag_directive; + + } data; + + /** The beginning of the token. */ + yaml_mark_t start_mark; + /** The end of the token. */ + yaml_mark_t end_mark; + +} yaml_token_t; + +/** + * Free any memory allocated for a token object. + * + * @param[in,out] token A token object. + */ + +YAML_DECLARE(void) +yaml_token_delete(yaml_token_t *token); + +/** @} */ + +/** + * @defgroup events Events + * @{ + */ + +/** Event types. */ +typedef enum yaml_event_type_e { + /** An empty event. */ + YAML_NO_EVENT, + + /** A STREAM-START event. */ + YAML_STREAM_START_EVENT, + /** A STREAM-END event. */ + YAML_STREAM_END_EVENT, + + /** A DOCUMENT-START event. */ + YAML_DOCUMENT_START_EVENT, + /** A DOCUMENT-END event. */ + YAML_DOCUMENT_END_EVENT, + + /** An ALIAS event. */ + YAML_ALIAS_EVENT, + /** A SCALAR event. */ + YAML_SCALAR_EVENT, + + /** A SEQUENCE-START event. */ + YAML_SEQUENCE_START_EVENT, + /** A SEQUENCE-END event. */ + YAML_SEQUENCE_END_EVENT, + + /** A MAPPING-START event. */ + YAML_MAPPING_START_EVENT, + /** A MAPPING-END event. */ + YAML_MAPPING_END_EVENT +} yaml_event_type_t; + +/** The event structure. */ +typedef struct yaml_event_s { + + /** The event type. */ + yaml_event_type_t type; + + /** The event data. */ + union { + + /** The stream parameters (for @c YAML_STREAM_START_EVENT). */ + struct { + /** The document encoding. */ + yaml_encoding_t encoding; + } stream_start; + + /** The document parameters (for @c YAML_DOCUMENT_START_EVENT). */ + struct { + /** The version directive. */ + yaml_version_directive_t *version_directive; + + /** The list of tag directives. */ + struct { + /** The beginning of the tag directives list. */ + yaml_tag_directive_t *start; + /** The end of the tag directives list. */ + yaml_tag_directive_t *end; + } tag_directives; + + /** Is the document indicator implicit? */ + int implicit; + } document_start; + + /** The document end parameters (for @c YAML_DOCUMENT_END_EVENT). */ + struct { + /** Is the document end indicator implicit? */ + int implicit; + } document_end; + + /** The alias parameters (for @c YAML_ALIAS_EVENT). */ + struct { + /** The anchor. */ + yaml_char_t *anchor; + } alias; + + /** The scalar parameters (for @c YAML_SCALAR_EVENT). */ + struct { + /** The anchor. */ + yaml_char_t *anchor; + /** The tag. */ + yaml_char_t *tag; + /** The scalar value. */ + yaml_char_t *value; + /** The length of the scalar value. */ + size_t length; + /** Is the tag optional for the plain style? */ + int plain_implicit; + /** Is the tag optional for any non-plain style? */ + int quoted_implicit; + /** The scalar style. */ + yaml_scalar_style_t style; + } scalar; + + /** The sequence parameters (for @c YAML_SEQUENCE_START_EVENT). */ + struct { + /** The anchor. */ + yaml_char_t *anchor; + /** The tag. */ + yaml_char_t *tag; + /** Is the tag optional? */ + int implicit; + /** The sequence style. */ + yaml_sequence_style_t style; + } sequence_start; + + /** The mapping parameters (for @c YAML_MAPPING_START_EVENT). */ + struct { + /** The anchor. */ + yaml_char_t *anchor; + /** The tag. */ + yaml_char_t *tag; + /** Is the tag optional? */ + int implicit; + /** The mapping style. */ + yaml_mapping_style_t style; + } mapping_start; + + } data; + + /** The beginning of the event. */ + yaml_mark_t start_mark; + /** The end of the event. */ + yaml_mark_t end_mark; + +} yaml_event_t; + +/** + * Create the STREAM-START event. + * + * @param[out] event An empty event object. + * @param[in] encoding The stream encoding. + * + * @returns @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_stream_start_event_initialize(yaml_event_t *event, + yaml_encoding_t encoding); + +/** + * Create the STREAM-END event. + * + * @param[out] event An empty event object. + * + * @returns @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_stream_end_event_initialize(yaml_event_t *event); + +/** + * Create the DOCUMENT-START event. + * + * The @a implicit argument is considered as a stylistic parameter and may be + * ignored by the emitter. + * + * @param[out] event An empty event object. + * @param[in] version_directive The %YAML directive value or + * @c NULL. + * @param[in] tag_directives_start The beginning of the %TAG + * directives list. + * @param[in] tag_directives_end The end of the %TAG directives + * list. + * @param[in] implicit If the document start indicator is + * implicit. + * + * @returns @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_document_start_event_initialize(yaml_event_t *event, + yaml_version_directive_t *version_directive, + yaml_tag_directive_t *tag_directives_start, + yaml_tag_directive_t *tag_directives_end, + int implicit); + +/** + * Create the DOCUMENT-END event. + * + * The @a implicit argument is considered as a stylistic parameter and may be + * ignored by the emitter. + * + * @param[out] event An empty event object. + * @param[in] implicit If the document end indicator is implicit. + * + * @returns @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_document_end_event_initialize(yaml_event_t *event, int implicit); + +/** + * Create an ALIAS event. + * + * @param[out] event An empty event object. + * @param[in] anchor The anchor value. + * + * @returns @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_alias_event_initialize(yaml_event_t *event, yaml_char_t *anchor); + +/** + * Create a SCALAR event. + * + * The @a style argument may be ignored by the emitter. + * + * Either the @a tag attribute or one of the @a plain_implicit and + * @a quoted_implicit flags must be set. + * + * @param[out] event An empty event object. + * @param[in] anchor The scalar anchor or @c NULL. + * @param[in] tag The scalar tag or @c NULL. + * @param[in] value The scalar value. + * @param[in] length The length of the scalar value. + * @param[in] plain_implicit If the tag may be omitted for the plain + * style. + * @param[in] quoted_implicit If the tag may be omitted for any + * non-plain style. + * @param[in] style The scalar style. + * + * @returns @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_scalar_event_initialize(yaml_event_t *event, + yaml_char_t *anchor, yaml_char_t *tag, + yaml_char_t *value, int length, + int plain_implicit, int quoted_implicit, + yaml_scalar_style_t style); + +/** + * Create a SEQUENCE-START event. + * + * The @a style argument may be ignored by the emitter. + * + * Either the @a tag attribute or the @a implicit flag must be set. + * + * @param[out] event An empty event object. + * @param[in] anchor The sequence anchor or @c NULL. + * @param[in] tag The sequence tag or @c NULL. + * @param[in] implicit If the tag may be omitted. + * @param[in] style The sequence style. + * + * @returns @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_sequence_start_event_initialize(yaml_event_t *event, + yaml_char_t *anchor, yaml_char_t *tag, int implicit, + yaml_sequence_style_t style); + +/** + * Create a SEQUENCE-END event. + * + * @param[out] event An empty event object. + * + * @returns @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_sequence_end_event_initialize(yaml_event_t *event); + +/** + * Create a MAPPING-START event. + * + * The @a style argument may be ignored by the emitter. + * + * Either the @a tag attribute or the @a implicit flag must be set. + * + * @param[out] event An empty event object. + * @param[in] anchor The mapping anchor or @c NULL. + * @param[in] tag The mapping tag or @c NULL. + * @param[in] implicit If the tag may be omitted. + * @param[in] style The mapping style. + * + * @returns @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_mapping_start_event_initialize(yaml_event_t *event, + yaml_char_t *anchor, yaml_char_t *tag, int implicit, + yaml_mapping_style_t style); + +/** + * Create a MAPPING-END event. + * + * @param[out] event An empty event object. + * + * @returns @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_mapping_end_event_initialize(yaml_event_t *event); + +/** + * Free any memory allocated for an event object. + * + * @param[in,out] event An event object. + */ + +YAML_DECLARE(void) +yaml_event_delete(yaml_event_t *event); + +/** @} */ + +/** + * @defgroup nodes Nodes + * @{ + */ + +/** The tag @c !!null with the only possible value: @c null. */ +#define YAML_NULL_TAG "tag:yaml.org,2002:null" +/** The tag @c !!bool with the values: @c true and @c falce. */ +#define YAML_BOOL_TAG "tag:yaml.org,2002:bool" +/** The tag @c !!str for string values. */ +#define YAML_STR_TAG "tag:yaml.org,2002:str" +/** The tag @c !!int for integer values. */ +#define YAML_INT_TAG "tag:yaml.org,2002:int" +/** The tag @c !!float for float values. */ +#define YAML_FLOAT_TAG "tag:yaml.org,2002:float" +/** The tag @c !!timestamp for date and time values. */ +#define YAML_TIMESTAMP_TAG "tag:yaml.org,2002:timestamp" + +/** The tag @c !!seq is used to denote sequences. */ +#define YAML_SEQ_TAG "tag:yaml.org,2002:seq" +/** The tag @c !!map is used to denote mapping. */ +#define YAML_MAP_TAG "tag:yaml.org,2002:map" + +/** The default scalar tag is @c !!str. */ +#define YAML_DEFAULT_SCALAR_TAG YAML_STR_TAG +/** The default sequence tag is @c !!seq. */ +#define YAML_DEFAULT_SEQUENCE_TAG YAML_SEQ_TAG +/** The default mapping tag is @c !!map. */ +#define YAML_DEFAULT_MAPPING_TAG YAML_MAP_TAG + +/** Node types. */ +typedef enum yaml_node_type_e { + /** An empty node. */ + YAML_NO_NODE, + + /** A scalar node. */ + YAML_SCALAR_NODE, + /** A sequence node. */ + YAML_SEQUENCE_NODE, + /** A mapping node. */ + YAML_MAPPING_NODE +} yaml_node_type_t; + +/** The forward definition of a document node structure. */ +typedef struct yaml_node_s yaml_node_t; + +/** An element of a sequence node. */ +typedef int yaml_node_item_t; + +/** An element of a mapping node. */ +typedef struct yaml_node_pair_s { + /** The key of the element. */ + int key; + /** The value of the element. */ + int value; +} yaml_node_pair_t; + +/** The node structure. */ +struct yaml_node_s { + + /** The node type. */ + yaml_node_type_t type; + + /** The node tag. */ + yaml_char_t *tag; + + /** The node data. */ + union { + + /** The scalar parameters (for @c YAML_SCALAR_NODE). */ + struct { + /** The scalar value. */ + yaml_char_t *value; + /** The length of the scalar value. */ + size_t length; + /** The scalar style. */ + yaml_scalar_style_t style; + } scalar; + + /** The sequence parameters (for @c YAML_SEQUENCE_NODE). */ + struct { + /** The stack of sequence items. */ + struct { + /** The beginning of the stack. */ + yaml_node_item_t *start; + /** The end of the stack. */ + yaml_node_item_t *end; + /** The top of the stack. */ + yaml_node_item_t *top; + } items; + /** The sequence style. */ + yaml_sequence_style_t style; + } sequence; + + /** The mapping parameters (for @c YAML_MAPPING_NODE). */ + struct { + /** The stack of mapping pairs (key, value). */ + struct { + /** The beginning of the stack. */ + yaml_node_pair_t *start; + /** The end of the stack. */ + yaml_node_pair_t *end; + /** The top of the stack. */ + yaml_node_pair_t *top; + } pairs; + /** The mapping style. */ + yaml_mapping_style_t style; + } mapping; + + } data; + + /** The beginning of the node. */ + yaml_mark_t start_mark; + /** The end of the node. */ + yaml_mark_t end_mark; + +}; + +/** The document structure. */ +typedef struct yaml_document_s { + + /** The document nodes. */ + struct { + /** The beginning of the stack. */ + yaml_node_t *start; + /** The end of the stack. */ + yaml_node_t *end; + /** The top of the stack. */ + yaml_node_t *top; + } nodes; + + /** The version directive. */ + yaml_version_directive_t *version_directive; + + /** The list of tag directives. */ + struct { + /** The beginning of the tag directives list. */ + yaml_tag_directive_t *start; + /** The end of the tag directives list. */ + yaml_tag_directive_t *end; + } tag_directives; + + /** Is the document start indicator implicit? */ + int start_implicit; + /** Is the document end indicator implicit? */ + int end_implicit; + + /** The beginning of the document. */ + yaml_mark_t start_mark; + /** The end of the document. */ + yaml_mark_t end_mark; + +} yaml_document_t; + +/** + * Create a YAML document. + * + * @param[out] document An empty document object. + * @param[in] version_directive The %YAML directive value or + * @c NULL. + * @param[in] tag_directives_start The beginning of the %TAG + * directives list. + * @param[in] tag_directives_end The end of the %TAG directives + * list. + * @param[in] start_implicit If the document start indicator is + * implicit. + * @param[in] end_implicit If the document end indicator is + * implicit. + * + * @returns @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_document_initialize(yaml_document_t *document, + yaml_version_directive_t *version_directive, + yaml_tag_directive_t *tag_directives_start, + yaml_tag_directive_t *tag_directives_end, + int start_implicit, int end_implicit); + +/** + * Delete a YAML document and all its nodes. + * + * @param[in,out] document A document object. + */ + +YAML_DECLARE(void) +yaml_document_delete(yaml_document_t *document); + +/** + * Get a node of a YAML document. + * + * The pointer returned by this function is valid until any of the functions + * modifying the documents are called. + * + * @param[in] document A document object. + * @param[in] index The node id. + * + * @returns the node objct or @c NULL if @c node_id is out of range. + */ + +YAML_DECLARE(yaml_node_t *) +yaml_document_get_node(yaml_document_t *document, int index); + +/** + * Get the root of a YAML document node. + * + * The root object is the first object added to the document. + * + * The pointer returned by this function is valid until any of the functions + * modifying the documents are called. + * + * An empty document produced by the parser signifies the end of a YAML + * stream. + * + * @param[in] document A document object. + * + * @returns the node object or @c NULL if the document is empty. + */ + +YAML_DECLARE(yaml_node_t *) +yaml_document_get_root_node(yaml_document_t *document); + +/** + * Create a SCALAR node and attach it to the document. + * + * The @a style argument may be ignored by the emitter. + * + * @param[in,out] document A document object. + * @param[in] tag The scalar tag. + * @param[in] value The scalar value. + * @param[in] length The length of the scalar value. + * @param[in] style The scalar style. + * + * @returns the node id or @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_document_add_scalar(yaml_document_t *document, + yaml_char_t *tag, yaml_char_t *value, int length, + yaml_scalar_style_t style); + +/** + * Create a SEQUENCE node and attach it to the document. + * + * The @a style argument may be ignored by the emitter. + * + * @param[in,out] document A document object. + * @param[in] tag The sequence tag. + * @param[in] style The sequence style. + * + * @returns the node id or @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_document_add_sequence(yaml_document_t *document, + yaml_char_t *tag, yaml_sequence_style_t style); + +/** + * Create a MAPPING node and attach it to the document. + * + * The @a style argument may be ignored by the emitter. + * + * @param[in,out] document A document object. + * @param[in] tag The sequence tag. + * @param[in] style The sequence style. + * + * @returns the node id or @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_document_add_mapping(yaml_document_t *document, + yaml_char_t *tag, yaml_mapping_style_t style); + +/** + * Add an item to a SEQUENCE node. + * + * @param[in,out] document A document object. + * @param[in] sequence The sequence node id. + * @param[in] item The item node id. +* + * @returns @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_document_append_sequence_item(yaml_document_t *document, + int sequence, int item); + +/** + * Add a pair of a key and a value to a MAPPING node. + * + * @param[in,out] document A document object. + * @param[in] mapping The mapping node id. + * @param[in] key The key node id. + * @param[in] value The value node id. +* + * @returns @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_document_append_mapping_pair(yaml_document_t *document, + int mapping, int key, int value); + +/** @} */ + +/** + * @defgroup parser Parser Definitions + * @{ + */ + +/** + * The prototype of a read handler. + * + * The read handler is called when the parser needs to read more bytes from the + * source. The handler should write not more than @a size bytes to the @a + * buffer. The number of written bytes should be set to the @a length variable. + * + * @param[in,out] data A pointer to an application data specified by + * yaml_parser_set_input(). + * @param[out] buffer The buffer to write the data from the source. + * @param[in] size The size of the buffer. + * @param[out] size_read The actual number of bytes read from the source. + * + * @returns On success, the handler should return @c 1. If the handler failed, + * the returned value should be @c 0. On EOF, the handler should set the + * @a size_read to @c 0 and return @c 1. + */ + +typedef int yaml_read_handler_t(void *data, unsigned char *buffer, size_t size, + size_t *size_read); + +/** + * This structure holds information about a potential simple key. + */ + +typedef struct yaml_simple_key_s { + /** Is a simple key possible? */ + int possible; + + /** Is a simple key required? */ + int required; + + /** The number of the token. */ + size_t token_number; + + /** The position mark. */ + yaml_mark_t mark; +} yaml_simple_key_t; + +/** + * The states of the parser. + */ +typedef enum yaml_parser_state_e { + /** Expect STREAM-START. */ + YAML_PARSE_STREAM_START_STATE, + /** Expect the beginning of an implicit document. */ + YAML_PARSE_IMPLICIT_DOCUMENT_START_STATE, + /** Expect DOCUMENT-START. */ + YAML_PARSE_DOCUMENT_START_STATE, + /** Expect the content of a document. */ + YAML_PARSE_DOCUMENT_CONTENT_STATE, + /** Expect DOCUMENT-END. */ + YAML_PARSE_DOCUMENT_END_STATE, + /** Expect a block node. */ + YAML_PARSE_BLOCK_NODE_STATE, + /** Expect a block node or indentless sequence. */ + YAML_PARSE_BLOCK_NODE_OR_INDENTLESS_SEQUENCE_STATE, + /** Expect a flow node. */ + YAML_PARSE_FLOW_NODE_STATE, + /** Expect the first entry of a block sequence. */ + YAML_PARSE_BLOCK_SEQUENCE_FIRST_ENTRY_STATE, + /** Expect an entry of a block sequence. */ + YAML_PARSE_BLOCK_SEQUENCE_ENTRY_STATE, + /** Expect an entry of an indentless sequence. */ + YAML_PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE, + /** Expect the first key of a block mapping. */ + YAML_PARSE_BLOCK_MAPPING_FIRST_KEY_STATE, + /** Expect a block mapping key. */ + YAML_PARSE_BLOCK_MAPPING_KEY_STATE, + /** Expect a block mapping value. */ + YAML_PARSE_BLOCK_MAPPING_VALUE_STATE, + /** Expect the first entry of a flow sequence. */ + YAML_PARSE_FLOW_SEQUENCE_FIRST_ENTRY_STATE, + /** Expect an entry of a flow sequence. */ + YAML_PARSE_FLOW_SEQUENCE_ENTRY_STATE, + /** Expect a key of an ordered mapping. */ + YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_KEY_STATE, + /** Expect a value of an ordered mapping. */ + YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_VALUE_STATE, + /** Expect the and of an ordered mapping entry. */ + YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_END_STATE, + /** Expect the first key of a flow mapping. */ + YAML_PARSE_FLOW_MAPPING_FIRST_KEY_STATE, + /** Expect a key of a flow mapping. */ + YAML_PARSE_FLOW_MAPPING_KEY_STATE, + /** Expect a value of a flow mapping. */ + YAML_PARSE_FLOW_MAPPING_VALUE_STATE, + /** Expect an empty value of a flow mapping. */ + YAML_PARSE_FLOW_MAPPING_EMPTY_VALUE_STATE, + /** Expect nothing. */ + YAML_PARSE_END_STATE +} yaml_parser_state_t; + +/** + * This structure holds aliases data. + */ + +typedef struct yaml_alias_data_s { + /** The anchor. */ + yaml_char_t *anchor; + /** The node id. */ + int index; + /** The anchor mark. */ + yaml_mark_t mark; +} yaml_alias_data_t; + +/** + * The parser structure. + * + * All members are internal. Manage the structure using the @c yaml_parser_ + * family of functions. + */ + +typedef struct yaml_parser_s { + + /** + * @name Error handling + * @{ + */ + + /** Error type. */ + yaml_error_type_t error; + /** Error description. */ + const char *problem; + /** The byte about which the problem occured. */ + size_t problem_offset; + /** The problematic value (@c -1 is none). */ + int problem_value; + /** The problem position. */ + yaml_mark_t problem_mark; + /** The error context. */ + const char *context; + /** The context position. */ + yaml_mark_t context_mark; + + /** + * @} + */ + + /** + * @name Reader stuff + * @{ + */ + + /** Read handler. */ + yaml_read_handler_t *read_handler; + + /** A pointer for passing to the read handler. */ + void *read_handler_data; + + /** Standard (string or file) input data. */ + union { + /** String input data. */ + struct { + /** The string start pointer. */ + const unsigned char *start; + /** The string end pointer. */ + const unsigned char *end; + /** The string current position. */ + const unsigned char *current; + } string; + + /** File input data. */ + FILE *file; + } input; + + /** EOF flag */ + int eof; + + /** The working buffer. */ + struct { + /** The beginning of the buffer. */ + yaml_char_t *start; + /** The end of the buffer. */ + yaml_char_t *end; + /** The current position of the buffer. */ + yaml_char_t *pointer; + /** The last filled position of the buffer. */ + yaml_char_t *last; + } buffer; + + /* The number of unread characters in the buffer. */ + size_t unread; + + /** The raw buffer. */ + struct { + /** The beginning of the buffer. */ + unsigned char *start; + /** The end of the buffer. */ + unsigned char *end; + /** The current position of the buffer. */ + unsigned char *pointer; + /** The last filled position of the buffer. */ + unsigned char *last; + } raw_buffer; + + /** The input encoding. */ + yaml_encoding_t encoding; + + /** The offset of the current position (in bytes). */ + size_t offset; + + /** The mark of the current position. */ + yaml_mark_t mark; + + /** + * @} + */ + + /** + * @name Scanner stuff + * @{ + */ + + /** Have we started to scan the input stream? */ + int stream_start_produced; + + /** Have we reached the end of the input stream? */ + int stream_end_produced; + + /** The number of unclosed '[' and '{' indicators. */ + int flow_level; + + /** The tokens queue. */ + struct { + /** The beginning of the tokens queue. */ + yaml_token_t *start; + /** The end of the tokens queue. */ + yaml_token_t *end; + /** The head of the tokens queue. */ + yaml_token_t *head; + /** The tail of the tokens queue. */ + yaml_token_t *tail; + } tokens; + + /** The number of tokens fetched from the queue. */ + size_t tokens_parsed; + + /* Does the tokens queue contain a token ready for dequeueing. */ + int token_available; + + /** The indentation levels stack. */ + struct { + /** The beginning of the stack. */ + int *start; + /** The end of the stack. */ + int *end; + /** The top of the stack. */ + int *top; + } indents; + + /** The current indentation level. */ + int indent; + + /** May a simple key occur at the current position? */ + int simple_key_allowed; + + /** The stack of simple keys. */ + struct { + /** The beginning of the stack. */ + yaml_simple_key_t *start; + /** The end of the stack. */ + yaml_simple_key_t *end; + /** The top of the stack. */ + yaml_simple_key_t *top; + } simple_keys; + + /** + * @} + */ + + /** + * @name Parser stuff + * @{ + */ + + /** The parser states stack. */ + struct { + /** The beginning of the stack. */ + yaml_parser_state_t *start; + /** The end of the stack. */ + yaml_parser_state_t *end; + /** The top of the stack. */ + yaml_parser_state_t *top; + } states; + + /** The current parser state. */ + yaml_parser_state_t state; + + /** The stack of marks. */ + struct { + /** The beginning of the stack. */ + yaml_mark_t *start; + /** The end of the stack. */ + yaml_mark_t *end; + /** The top of the stack. */ + yaml_mark_t *top; + } marks; + + /** The list of TAG directives. */ + struct { + /** The beginning of the list. */ + yaml_tag_directive_t *start; + /** The end of the list. */ + yaml_tag_directive_t *end; + /** The top of the list. */ + yaml_tag_directive_t *top; + } tag_directives; + + /** + * @} + */ + + /** + * @name Dumper stuff + * @{ + */ + + /** The alias data. */ + struct { + /** The beginning of the list. */ + yaml_alias_data_t *start; + /** The end of the list. */ + yaml_alias_data_t *end; + /** The top of the list. */ + yaml_alias_data_t *top; + } aliases; + + /** The currently parsed document. */ + yaml_document_t *document; + + /** + * @} + */ + +} yaml_parser_t; + +/** + * Initialize a parser. + * + * This function creates a new parser object. An application is responsible + * for destroying the object using the yaml_parser_delete() function. + * + * @param[out] parser An empty parser object. + * + * @returns @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_parser_initialize(yaml_parser_t *parser); + +/** + * Destroy a parser. + * + * @param[in,out] parser A parser object. + */ + +YAML_DECLARE(void) +yaml_parser_delete(yaml_parser_t *parser); + +/** + * Set a string input. + * + * Note that the @a input pointer must be valid while the @a parser object + * exists. The application is responsible for destroing @a input after + * destroying the @a parser. + * + * @param[in,out] parser A parser object. + * @param[in] input A source data. + * @param[in] size The length of the source data in bytes. + */ + +YAML_DECLARE(void) +yaml_parser_set_input_string(yaml_parser_t *parser, + const unsigned char *input, size_t size); + +/** + * Set a file input. + * + * @a file should be a file object open for reading. The application is + * responsible for closing the @a file. + * + * @param[in,out] parser A parser object. + * @param[in] file An open file. + */ + +YAML_DECLARE(void) +yaml_parser_set_input_file(yaml_parser_t *parser, FILE *file); + +/** + * Set a generic input handler. + * + * @param[in,out] parser A parser object. + * @param[in] handler A read handler. + * @param[in] data Any application data for passing to the read + * handler. + */ + +YAML_DECLARE(void) +yaml_parser_set_input(yaml_parser_t *parser, + yaml_read_handler_t *handler, void *data); + +/** + * Set the source encoding. + * + * @param[in,out] parser A parser object. + * @param[in] encoding The source encoding. + */ + +YAML_DECLARE(void) +yaml_parser_set_encoding(yaml_parser_t *parser, yaml_encoding_t encoding); + +/** + * Scan the input stream and produce the next token. + * + * Call the function subsequently to produce a sequence of tokens corresponding + * to the input stream. The initial token has the type + * @c YAML_STREAM_START_TOKEN while the ending token has the type + * @c YAML_STREAM_END_TOKEN. + * + * An application is responsible for freeing any buffers associated with the + * produced token object using the @c yaml_token_delete function. + * + * An application must not alternate the calls of yaml_parser_scan() with the + * calls of yaml_parser_parse() or yaml_parser_load(). Doing this will break + * the parser. + * + * @param[in,out] parser A parser object. + * @param[out] token An empty token object. + * + * @returns @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_parser_scan(yaml_parser_t *parser, yaml_token_t *token); + +/** + * Parse the input stream and produce the next parsing event. + * + * Call the function subsequently to produce a sequence of events corresponding + * to the input stream. The initial event has the type + * @c YAML_STREAM_START_EVENT while the ending event has the type + * @c YAML_STREAM_END_EVENT. + * + * An application is responsible for freeing any buffers associated with the + * produced event object using the yaml_event_delete() function. + * + * An application must not alternate the calls of yaml_parser_parse() with the + * calls of yaml_parser_scan() or yaml_parser_load(). Doing this will break the + * parser. + * + * @param[in,out] parser A parser object. + * @param[out] event An empty event object. + * + * @returns @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_parser_parse(yaml_parser_t *parser, yaml_event_t *event); + +/** + * Parse the input stream and produce the next YAML document. + * + * Call this function subsequently to produce a sequence of documents + * constituting the input stream. + * + * If the produced document has no root node, it means that the document + * end has been reached. + * + * An application is responsible for freeing any data associated with the + * produced document object using the yaml_document_delete() function. + * + * An application must not alternate the calls of yaml_parser_load() with the + * calls of yaml_parser_scan() or yaml_parser_parse(). Doing this will break + * the parser. + * + * @param[in,out] parser A parser object. + * @param[out] document An empty document object. + * + * @return @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_parser_load(yaml_parser_t *parser, yaml_document_t *document); + +/** @} */ + +/** + * @defgroup emitter Emitter Definitions + * @{ + */ + +/** + * The prototype of a write handler. + * + * The write handler is called when the emitter needs to flush the accumulated + * characters to the output. The handler should write @a size bytes of the + * @a buffer to the output. + * + * @param[in,out] data A pointer to an application data specified by + * yaml_emitter_set_output(). + * @param[in] buffer The buffer with bytes to be written. + * @param[in] size The size of the buffer. + * + * @returns On success, the handler should return @c 1. If the handler failed, + * the returned value should be @c 0. + */ + +typedef int yaml_write_handler_t(void *data, unsigned char *buffer, size_t size); + +/** The emitter states. */ +typedef enum yaml_emitter_state_e { + /** Expect STREAM-START. */ + YAML_EMIT_STREAM_START_STATE, + /** Expect the first DOCUMENT-START or STREAM-END. */ + YAML_EMIT_FIRST_DOCUMENT_START_STATE, + /** Expect DOCUMENT-START or STREAM-END. */ + YAML_EMIT_DOCUMENT_START_STATE, + /** Expect the content of a document. */ + YAML_EMIT_DOCUMENT_CONTENT_STATE, + /** Expect DOCUMENT-END. */ + YAML_EMIT_DOCUMENT_END_STATE, + /** Expect the first item of a flow sequence. */ + YAML_EMIT_FLOW_SEQUENCE_FIRST_ITEM_STATE, + /** Expect an item of a flow sequence. */ + YAML_EMIT_FLOW_SEQUENCE_ITEM_STATE, + /** Expect the first key of a flow mapping. */ + YAML_EMIT_FLOW_MAPPING_FIRST_KEY_STATE, + /** Expect a key of a flow mapping. */ + YAML_EMIT_FLOW_MAPPING_KEY_STATE, + /** Expect a value for a simple key of a flow mapping. */ + YAML_EMIT_FLOW_MAPPING_SIMPLE_VALUE_STATE, + /** Expect a value of a flow mapping. */ + YAML_EMIT_FLOW_MAPPING_VALUE_STATE, + /** Expect the first item of a block sequence. */ + YAML_EMIT_BLOCK_SEQUENCE_FIRST_ITEM_STATE, + /** Expect an item of a block sequence. */ + YAML_EMIT_BLOCK_SEQUENCE_ITEM_STATE, + /** Expect the first key of a block mapping. */ + YAML_EMIT_BLOCK_MAPPING_FIRST_KEY_STATE, + /** Expect the key of a block mapping. */ + YAML_EMIT_BLOCK_MAPPING_KEY_STATE, + /** Expect a value for a simple key of a block mapping. */ + YAML_EMIT_BLOCK_MAPPING_SIMPLE_VALUE_STATE, + /** Expect a value of a block mapping. */ + YAML_EMIT_BLOCK_MAPPING_VALUE_STATE, + /** Expect nothing. */ + YAML_EMIT_END_STATE +} yaml_emitter_state_t; + +/** + * The emitter structure. + * + * All members are internal. Manage the structure using the @c yaml_emitter_ + * family of functions. + */ + +typedef struct yaml_emitter_s { + + /** + * @name Error handling + * @{ + */ + + /** Error type. */ + yaml_error_type_t error; + /** Error description. */ + const char *problem; + + /** + * @} + */ + + /** + * @name Writer stuff + * @{ + */ + + /** Write handler. */ + yaml_write_handler_t *write_handler; + + /** A pointer for passing to the white handler. */ + void *write_handler_data; + + /** Standard (string or file) output data. */ + union { + /** String output data. */ + struct { + /** The buffer pointer. */ + unsigned char *buffer; + /** The buffer size. */ + size_t size; + /** The number of written bytes. */ + size_t *size_written; + } string; + + /** File output data. */ + FILE *file; + } output; + + /** The working buffer. */ + struct { + /** The beginning of the buffer. */ + yaml_char_t *start; + /** The end of the buffer. */ + yaml_char_t *end; + /** The current position of the buffer. */ + yaml_char_t *pointer; + /** The last filled position of the buffer. */ + yaml_char_t *last; + } buffer; + + /** The raw buffer. */ + struct { + /** The beginning of the buffer. */ + unsigned char *start; + /** The end of the buffer. */ + unsigned char *end; + /** The current position of the buffer. */ + unsigned char *pointer; + /** The last filled position of the buffer. */ + unsigned char *last; + } raw_buffer; + + /** The stream encoding. */ + yaml_encoding_t encoding; + + /** + * @} + */ + + /** + * @name Emitter stuff + * @{ + */ + + /** If the output is in the canonical style? */ + int canonical; + /** The number of indentation spaces. */ + int best_indent; + /** The preferred width of the output lines. */ + int best_width; + /** Allow unescaped non-ASCII characters? */ + int unicode; + /** The preferred line break. */ + yaml_break_t line_break; + + /** The stack of states. */ + struct { + /** The beginning of the stack. */ + yaml_emitter_state_t *start; + /** The end of the stack. */ + yaml_emitter_state_t *end; + /** The top of the stack. */ + yaml_emitter_state_t *top; + } states; + + /** The current emitter state. */ + yaml_emitter_state_t state; + + /** The event queue. */ + struct { + /** The beginning of the event queue. */ + yaml_event_t *start; + /** The end of the event queue. */ + yaml_event_t *end; + /** The head of the event queue. */ + yaml_event_t *head; + /** The tail of the event queue. */ + yaml_event_t *tail; + } events; + + /** The stack of indentation levels. */ + struct { + /** The beginning of the stack. */ + int *start; + /** The end of the stack. */ + int *end; + /** The top of the stack. */ + int *top; + } indents; + + /** The list of tag directives. */ + struct { + /** The beginning of the list. */ + yaml_tag_directive_t *start; + /** The end of the list. */ + yaml_tag_directive_t *end; + /** The top of the list. */ + yaml_tag_directive_t *top; + } tag_directives; + + /** The current indentation level. */ + int indent; + + /** The current flow level. */ + int flow_level; + + /** Is it the document root context? */ + int root_context; + /** Is it a sequence context? */ + int sequence_context; + /** Is it a mapping context? */ + int mapping_context; + /** Is it a simple mapping key context? */ + int simple_key_context; + + /** The current line. */ + int line; + /** The current column. */ + int column; + /** If the last character was a whitespace? */ + int whitespace; + /** If the last character was an indentation character (' ', '-', '?', ':')? */ + int indention; + /** If an explicit document end is required? */ + int open_ended; + + /** Anchor analysis. */ + struct { + /** The anchor value. */ + yaml_char_t *anchor; + /** The anchor length. */ + size_t anchor_length; + /** Is it an alias? */ + int alias; + } anchor_data; + + /** Tag analysis. */ + struct { + /** The tag handle. */ + yaml_char_t *handle; + /** The tag handle length. */ + size_t handle_length; + /** The tag suffix. */ + yaml_char_t *suffix; + /** The tag suffix length. */ + size_t suffix_length; + } tag_data; + + /** Scalar analysis. */ + struct { + /** The scalar value. */ + yaml_char_t *value; + /** The scalar length. */ + size_t length; + /** Does the scalar contain line breaks? */ + int multiline; + /** Can the scalar be expessed in the flow plain style? */ + int flow_plain_allowed; + /** Can the scalar be expressed in the block plain style? */ + int block_plain_allowed; + /** Can the scalar be expressed in the single quoted style? */ + int single_quoted_allowed; + /** Can the scalar be expressed in the literal or folded styles? */ + int block_allowed; + /** The output style. */ + yaml_scalar_style_t style; + } scalar_data; + + /** + * @} + */ + + /** + * @name Dumper stuff + * @{ + */ + + /** If the stream was already opened? */ + int opened; + /** If the stream was already closed? */ + int closed; + + /** The information associated with the document nodes. */ + struct { + /** The number of references. */ + int references; + /** The anchor id. */ + int anchor; + /** If the node has been emitted? */ + int serialized; + } *anchors; + + /** The last assigned anchor id. */ + int last_anchor_id; + + /** The currently emitted document. */ + yaml_document_t *document; + + /** + * @} + */ + +} yaml_emitter_t; + +/** + * Initialize an emitter. + * + * This function creates a new emitter object. An application is responsible + * for destroying the object using the yaml_emitter_delete() function. + * + * @param[out] emitter An empty parser object. + * + * @returns @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_emitter_initialize(yaml_emitter_t *emitter); + +/** + * Destroy an emitter. + * + * @param[in,out] emitter An emitter object. + */ + +YAML_DECLARE(void) +yaml_emitter_delete(yaml_emitter_t *emitter); + +/** + * Set a string output. + * + * The emitter will write the output characters to the @a output buffer of the + * size @a size. The emitter will set @a size_written to the number of written + * bytes. If the buffer is smaller than required, the emitter produces the + * YAML_WRITE_ERROR error. + * + * @param[in,out] emitter An emitter object. + * @param[in] output An output buffer. + * @param[in] size The buffer size. + * @param[in] size_written The pointer to save the number of written + * bytes. + */ + +YAML_DECLARE(void) +yaml_emitter_set_output_string(yaml_emitter_t *emitter, + unsigned char *output, size_t size, size_t *size_written); + +/** + * Set a file output. + * + * @a file should be a file object open for writing. The application is + * responsible for closing the @a file. + * + * @param[in,out] emitter An emitter object. + * @param[in] file An open file. + */ + +YAML_DECLARE(void) +yaml_emitter_set_output_file(yaml_emitter_t *emitter, FILE *file); + +/** + * Set a generic output handler. + * + * @param[in,out] emitter An emitter object. + * @param[in] handler A write handler. + * @param[in] data Any application data for passing to the write + * handler. + */ + +YAML_DECLARE(void) +yaml_emitter_set_output(yaml_emitter_t *emitter, + yaml_write_handler_t *handler, void *data); + +/** + * Set the output encoding. + * + * @param[in,out] emitter An emitter object. + * @param[in] encoding The output encoding. + */ + +YAML_DECLARE(void) +yaml_emitter_set_encoding(yaml_emitter_t *emitter, yaml_encoding_t encoding); + +/** + * Set if the output should be in the "canonical" format as in the YAML + * specification. + * + * @param[in,out] emitter An emitter object. + * @param[in] canonical If the output is canonical. + */ + +YAML_DECLARE(void) +yaml_emitter_set_canonical(yaml_emitter_t *emitter, int canonical); + +/** + * Set the intendation increment. + * + * @param[in,out] emitter An emitter object. + * @param[in] indent The indentation increment (1 < . < 10). + */ + +YAML_DECLARE(void) +yaml_emitter_set_indent(yaml_emitter_t *emitter, int indent); + +/** + * Set the preferred line width. @c -1 means unlimited. + * + * @param[in,out] emitter An emitter object. + * @param[in] width The preferred line width. + */ + +YAML_DECLARE(void) +yaml_emitter_set_width(yaml_emitter_t *emitter, int width); + +/** + * Set if unescaped non-ASCII characters are allowed. + * + * @param[in,out] emitter An emitter object. + * @param[in] unicode If unescaped Unicode characters are allowed. + */ + +YAML_DECLARE(void) +yaml_emitter_set_unicode(yaml_emitter_t *emitter, int unicode); + +/** + * Set the preferred line break. + * + * @param[in,out] emitter An emitter object. + * @param[in] line_break The preferred line break. + */ + +YAML_DECLARE(void) +yaml_emitter_set_break(yaml_emitter_t *emitter, yaml_break_t line_break); + +/** + * Emit an event. + * + * The event object may be generated using the yaml_parser_parse() function. + * The emitter takes the responsibility for the event object and destroys its + * content after it is emitted. The event object is destroyed even if the + * function fails. + * + * @param[in,out] emitter An emitter object. + * @param[in,out] event An event object. + * + * @returns @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_emitter_emit(yaml_emitter_t *emitter, yaml_event_t *event); + +/** + * Start a YAML stream. + * + * This function should be used before yaml_emitter_dump() is called. + * + * @param[in,out] emitter An emitter object. + * + * @returns @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_emitter_open(yaml_emitter_t *emitter); + +/** + * Finish a YAML stream. + * + * This function should be used after yaml_emitter_dump() is called. + * + * @param[in,out] emitter An emitter object. + * + * @returns @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_emitter_close(yaml_emitter_t *emitter); + +/** + * Emit a YAML document. + * + * The documen object may be generated using the yaml_parser_load() function + * or the yaml_document_initialize() function. The emitter takes the + * responsibility for the document object and destoys its content after + * it is emitted. The document object is destroyedeven if the function fails. + * + * @param[in,out] emitter An emitter object. + * @param[in,out] document A document object. + * + * @returns @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_emitter_dump(yaml_emitter_t *emitter, yaml_document_t *document); + +/** + * Flush the accumulated characters to the output. + * + * @param[in,out] emitter An emitter object. + * + * @returns @c 1 if the function succeeded, @c 0 on error. + */ + +YAML_DECLARE(int) +yaml_emitter_flush(yaml_emitter_t *emitter); + +/** @} */ + +#ifdef __cplusplus +} +#endif + +#endif /* #ifndef YAML_H */ + diff --git a/ext/psych/yaml/yaml_private.h b/ext/psych/yaml/yaml_private.h new file mode 100644 index 0000000000..2b3e0744d1 --- /dev/null +++ b/ext/psych/yaml/yaml_private.h @@ -0,0 +1,643 @@ +#ifdef RUBY_EXTCONF_H +#include RUBY_EXTCONF_H +#endif + +#if HAVE_CONFIG_H +#include <config.h> +#endif + +#include <yaml.h> + +#include <assert.h> +#include <limits.h> + +/* + * Memory management. + */ + +YAML_DECLARE(void *) +yaml_malloc(size_t size); + +YAML_DECLARE(void *) +yaml_realloc(void *ptr, size_t size); + +YAML_DECLARE(void) +yaml_free(void *ptr); + +YAML_DECLARE(yaml_char_t *) +yaml_strdup(const yaml_char_t *); + +/* + * Reader: Ensure that the buffer contains at least `length` characters. + */ + +YAML_DECLARE(int) +yaml_parser_update_buffer(yaml_parser_t *parser, size_t length); + +/* + * Scanner: Ensure that the token stack contains at least one token ready. + */ + +YAML_DECLARE(int) +yaml_parser_fetch_more_tokens(yaml_parser_t *parser); + +/* + * The size of the input raw buffer. + */ + +#define INPUT_RAW_BUFFER_SIZE 16384 + +/* + * The size of the input buffer. + * + * It should be possible to decode the whole raw buffer. + */ + +#define INPUT_BUFFER_SIZE (INPUT_RAW_BUFFER_SIZE*3) + +/* + * The size of the output buffer. + */ + +#define OUTPUT_BUFFER_SIZE 16384 + +/* + * The size of the output raw buffer. + * + * It should be possible to encode the whole output buffer. + */ + +#define OUTPUT_RAW_BUFFER_SIZE (OUTPUT_BUFFER_SIZE*2+2) + +/* + * The size of other stacks and queues. + */ + +#define INITIAL_STACK_SIZE 16 +#define INITIAL_QUEUE_SIZE 16 +#define INITIAL_STRING_SIZE 16 + +/* + * Buffer management. + */ + +#define BUFFER_INIT(context,buffer,size) \ + (((buffer).start = yaml_malloc(size)) ? \ + ((buffer).last = (buffer).pointer = (buffer).start, \ + (buffer).end = (buffer).start+(size), \ + 1) : \ + ((context)->error = YAML_MEMORY_ERROR, \ + 0)) + +#define BUFFER_DEL(context,buffer) \ + (yaml_free((buffer).start), \ + (buffer).start = (buffer).pointer = (buffer).end = 0) + +/* + * String management. + */ + +typedef struct { + yaml_char_t *start; + yaml_char_t *end; + yaml_char_t *pointer; +} yaml_string_t; + +YAML_DECLARE(int) +yaml_string_extend(yaml_char_t **start, + yaml_char_t **pointer, yaml_char_t **end); + +YAML_DECLARE(int) +yaml_string_join( + yaml_char_t **a_start, yaml_char_t **a_pointer, yaml_char_t **a_end, + yaml_char_t **b_start, yaml_char_t **b_pointer, yaml_char_t **b_end); + +#define NULL_STRING { NULL, NULL, NULL } + +#define STRING(string,length) { (string), (string)+(length), (string) } + +#define STRING_ASSIGN(value,string,length) \ + ((value).start = (string), \ + (value).end = (string)+(length), \ + (value).pointer = (string)) + +#define STRING_INIT(context,string,size) \ + (((string).start = yaml_malloc(size)) ? \ + ((string).pointer = (string).start, \ + (string).end = (string).start+(size), \ + memset((string).start, 0, (size)), \ + 1) : \ + ((context)->error = YAML_MEMORY_ERROR, \ + 0)) + +#define STRING_DEL(context,string) \ + (yaml_free((string).start), \ + (string).start = (string).pointer = (string).end = 0) + +#define STRING_EXTEND(context,string) \ + (((string).pointer+5 < (string).end) \ + || yaml_string_extend(&(string).start, \ + &(string).pointer, &(string).end)) + +#define CLEAR(context,string) \ + ((string).pointer = (string).start, \ + memset((string).start, 0, (string).end-(string).start)) + +#define JOIN(context,string_a,string_b) \ + ((yaml_string_join(&(string_a).start, &(string_a).pointer, \ + &(string_a).end, &(string_b).start, \ + &(string_b).pointer, &(string_b).end)) ? \ + ((string_b).pointer = (string_b).start, \ + 1) : \ + ((context)->error = YAML_MEMORY_ERROR, \ + 0)) + +/* + * String check operations. + */ + +/* + * Check the octet at the specified position. + */ + +#define CHECK_AT(string,octet,offset) \ + ((string).pointer[offset] == (yaml_char_t)(octet)) + +/* + * Check the current octet in the buffer. + */ + +#define CHECK(string,octet) CHECK_AT((string),(octet),0) + +/* + * Check if the character at the specified position is an alphabetical + * character, a digit, '_', or '-'. + */ + +#define IS_ALPHA_AT(string,offset) \ + (((string).pointer[offset] >= (yaml_char_t) '0' && \ + (string).pointer[offset] <= (yaml_char_t) '9') || \ + ((string).pointer[offset] >= (yaml_char_t) 'A' && \ + (string).pointer[offset] <= (yaml_char_t) 'Z') || \ + ((string).pointer[offset] >= (yaml_char_t) 'a' && \ + (string).pointer[offset] <= (yaml_char_t) 'z') || \ + (string).pointer[offset] == '_' || \ + (string).pointer[offset] == '-') + +#define IS_ALPHA(string) IS_ALPHA_AT((string),0) + +/* + * Check if the character at the specified position is a digit. + */ + +#define IS_DIGIT_AT(string,offset) \ + (((string).pointer[offset] >= (yaml_char_t) '0' && \ + (string).pointer[offset] <= (yaml_char_t) '9')) + +#define IS_DIGIT(string) IS_DIGIT_AT((string),0) + +/* + * Get the value of a digit. + */ + +#define AS_DIGIT_AT(string,offset) \ + ((string).pointer[offset] - (yaml_char_t) '0') + +#define AS_DIGIT(string) AS_DIGIT_AT((string),0) + +/* + * Check if the character at the specified position is a hex-digit. + */ + +#define IS_HEX_AT(string,offset) \ + (((string).pointer[offset] >= (yaml_char_t) '0' && \ + (string).pointer[offset] <= (yaml_char_t) '9') || \ + ((string).pointer[offset] >= (yaml_char_t) 'A' && \ + (string).pointer[offset] <= (yaml_char_t) 'F') || \ + ((string).pointer[offset] >= (yaml_char_t) 'a' && \ + (string).pointer[offset] <= (yaml_char_t) 'f')) + +#define IS_HEX(string) IS_HEX_AT((string),0) + +/* + * Get the value of a hex-digit. + */ + +#define AS_HEX_AT(string,offset) \ + (((string).pointer[offset] >= (yaml_char_t) 'A' && \ + (string).pointer[offset] <= (yaml_char_t) 'F') ? \ + ((string).pointer[offset] - (yaml_char_t) 'A' + 10) : \ + ((string).pointer[offset] >= (yaml_char_t) 'a' && \ + (string).pointer[offset] <= (yaml_char_t) 'f') ? \ + ((string).pointer[offset] - (yaml_char_t) 'a' + 10) : \ + ((string).pointer[offset] - (yaml_char_t) '0')) + +#define AS_HEX(string) AS_HEX_AT((string),0) + +/* + * Check if the character is ASCII. + */ + +#define IS_ASCII_AT(string,offset) \ + ((string).pointer[offset] <= (yaml_char_t) '\x7F') + +#define IS_ASCII(string) IS_ASCII_AT((string),0) + +/* + * Check if the character can be printed unescaped. + */ + +#define IS_PRINTABLE_AT(string,offset) \ + (((string).pointer[offset] == 0x0A) /* . == #x0A */ \ + || ((string).pointer[offset] >= 0x20 /* #x20 <= . <= #x7E */ \ + && (string).pointer[offset] <= 0x7E) \ + || ((string).pointer[offset] == 0xC2 /* #0xA0 <= . <= #xD7FF */ \ + && (string).pointer[offset+1] >= 0xA0) \ + || ((string).pointer[offset] > 0xC2 \ + && (string).pointer[offset] < 0xED) \ + || ((string).pointer[offset] == 0xED \ + && (string).pointer[offset+1] < 0xA0) \ + || ((string).pointer[offset] == 0xEE) \ + || ((string).pointer[offset] == 0xEF /* #xE000 <= . <= #xFFFD */ \ + && !((string).pointer[offset+1] == 0xBB /* && . != #xFEFF */ \ + && (string).pointer[offset+2] == 0xBF) \ + && !((string).pointer[offset+1] == 0xBF \ + && ((string).pointer[offset+2] == 0xBE \ + || (string).pointer[offset+2] == 0xBF)))) + +#define IS_PRINTABLE(string) IS_PRINTABLE_AT((string),0) + +/* + * Check if the character at the specified position is NUL. + */ + +#define IS_Z_AT(string,offset) CHECK_AT((string),'\0',(offset)) + +#define IS_Z(string) IS_Z_AT((string),0) + +/* + * Check if the character at the specified position is BOM. + */ + +#define IS_BOM_AT(string,offset) \ + (CHECK_AT((string),'\xEF',(offset)) \ + && CHECK_AT((string),'\xBB',(offset)+1) \ + && CHECK_AT((string),'\xBF',(offset)+2)) /* BOM (#xFEFF) */ + +#define IS_BOM(string) IS_BOM_AT(string,0) + +/* + * Check if the character at the specified position is space. + */ + +#define IS_SPACE_AT(string,offset) CHECK_AT((string),' ',(offset)) + +#define IS_SPACE(string) IS_SPACE_AT((string),0) + +/* + * Check if the character at the specified position is tab. + */ + +#define IS_TAB_AT(string,offset) CHECK_AT((string),'\t',(offset)) + +#define IS_TAB(string) IS_TAB_AT((string),0) + +/* + * Check if the character at the specified position is blank (space or tab). + */ + +#define IS_BLANK_AT(string,offset) \ + (IS_SPACE_AT((string),(offset)) || IS_TAB_AT((string),(offset))) + +#define IS_BLANK(string) IS_BLANK_AT((string),0) + +/* + * Check if the character at the specified position is a line break. + */ + +#define IS_BREAK_AT(string,offset) \ + (CHECK_AT((string),'\r',(offset)) /* CR (#xD)*/ \ + || CHECK_AT((string),'\n',(offset)) /* LF (#xA) */ \ + || (CHECK_AT((string),'\xC2',(offset)) \ + && CHECK_AT((string),'\x85',(offset)+1)) /* NEL (#x85) */ \ + || (CHECK_AT((string),'\xE2',(offset)) \ + && CHECK_AT((string),'\x80',(offset)+1) \ + && CHECK_AT((string),'\xA8',(offset)+2)) /* LS (#x2028) */ \ + || (CHECK_AT((string),'\xE2',(offset)) \ + && CHECK_AT((string),'\x80',(offset)+1) \ + && CHECK_AT((string),'\xA9',(offset)+2))) /* PS (#x2029) */ + +#define IS_BREAK(string) IS_BREAK_AT((string),0) + +#define IS_CRLF_AT(string,offset) \ + (CHECK_AT((string),'\r',(offset)) && CHECK_AT((string),'\n',(offset)+1)) + +#define IS_CRLF(string) IS_CRLF_AT((string),0) + +/* + * Check if the character is a line break or NUL. + */ + +#define IS_BREAKZ_AT(string,offset) \ + (IS_BREAK_AT((string),(offset)) || IS_Z_AT((string),(offset))) + +#define IS_BREAKZ(string) IS_BREAKZ_AT((string),0) + +/* + * Check if the character is a line break, space, or NUL. + */ + +#define IS_SPACEZ_AT(string,offset) \ + (IS_SPACE_AT((string),(offset)) || IS_BREAKZ_AT((string),(offset))) + +#define IS_SPACEZ(string) IS_SPACEZ_AT((string),0) + +/* + * Check if the character is a line break, space, tab, or NUL. + */ + +#define IS_BLANKZ_AT(string,offset) \ + (IS_BLANK_AT((string),(offset)) || IS_BREAKZ_AT((string),(offset))) + +#define IS_BLANKZ(string) IS_BLANKZ_AT((string),0) + +/* + * Determine the width of the character. + */ + +#define WIDTH_AT(string,offset) \ + (((string).pointer[offset] & 0x80) == 0x00 ? 1 : \ + ((string).pointer[offset] & 0xE0) == 0xC0 ? 2 : \ + ((string).pointer[offset] & 0xF0) == 0xE0 ? 3 : \ + ((string).pointer[offset] & 0xF8) == 0xF0 ? 4 : 0) + +#define WIDTH(string) WIDTH_AT((string),0) + +/* + * Move the string pointer to the next character. + */ + +#define MOVE(string) ((string).pointer += WIDTH((string))) + +/* + * Copy a character and move the pointers of both strings. + */ + +#define COPY(string_a,string_b) \ + ((*(string_b).pointer & 0x80) == 0x00 ? \ + (*((string_a).pointer++) = *((string_b).pointer++)) : \ + (*(string_b).pointer & 0xE0) == 0xC0 ? \ + (*((string_a).pointer++) = *((string_b).pointer++), \ + *((string_a).pointer++) = *((string_b).pointer++)) : \ + (*(string_b).pointer & 0xF0) == 0xE0 ? \ + (*((string_a).pointer++) = *((string_b).pointer++), \ + *((string_a).pointer++) = *((string_b).pointer++), \ + *((string_a).pointer++) = *((string_b).pointer++)) : \ + (*(string_b).pointer & 0xF8) == 0xF0 ? \ + (*((string_a).pointer++) = *((string_b).pointer++), \ + *((string_a).pointer++) = *((string_b).pointer++), \ + *((string_a).pointer++) = *((string_b).pointer++), \ + *((string_a).pointer++) = *((string_b).pointer++)) : 0) + +/* + * Stack and queue management. + */ + +YAML_DECLARE(int) +yaml_stack_extend(void **start, void **top, void **end); + +YAML_DECLARE(int) +yaml_queue_extend(void **start, void **head, void **tail, void **end); + +#define STACK_INIT(context,stack,size) \ + (((stack).start = yaml_malloc((size)*sizeof(*(stack).start))) ? \ + ((stack).top = (stack).start, \ + (stack).end = (stack).start+(size), \ + 1) : \ + ((context)->error = YAML_MEMORY_ERROR, \ + 0)) + +#define STACK_DEL(context,stack) \ + (yaml_free((stack).start), \ + (stack).start = (stack).top = (stack).end = 0) + +#define STACK_EMPTY(context,stack) \ + ((stack).start == (stack).top) + +#define PUSH(context,stack,value) \ + (((stack).top != (stack).end \ + || yaml_stack_extend((void **)&(stack).start, \ + (void **)&(stack).top, (void **)&(stack).end)) ? \ + (*((stack).top++) = value, \ + 1) : \ + ((context)->error = YAML_MEMORY_ERROR, \ + 0)) + +#define POP(context,stack) \ + (*(--(stack).top)) + +#define QUEUE_INIT(context,queue,size) \ + (((queue).start = yaml_malloc((size)*sizeof(*(queue).start))) ? \ + ((queue).head = (queue).tail = (queue).start, \ + (queue).end = (queue).start+(size), \ + 1) : \ + ((context)->error = YAML_MEMORY_ERROR, \ + 0)) + +#define QUEUE_DEL(context,queue) \ + (yaml_free((queue).start), \ + (queue).start = (queue).head = (queue).tail = (queue).end = 0) + +#define QUEUE_EMPTY(context,queue) \ + ((queue).head == (queue).tail) + +#define ENQUEUE(context,queue,value) \ + (((queue).tail != (queue).end \ + || yaml_queue_extend((void **)&(queue).start, (void **)&(queue).head, \ + (void **)&(queue).tail, (void **)&(queue).end)) ? \ + (*((queue).tail++) = value, \ + 1) : \ + ((context)->error = YAML_MEMORY_ERROR, \ + 0)) + +#define DEQUEUE(context,queue) \ + (*((queue).head++)) + +#define QUEUE_INSERT(context,queue,index,value) \ + (((queue).tail != (queue).end \ + || yaml_queue_extend((void **)&(queue).start, (void **)&(queue).head, \ + (void **)&(queue).tail, (void **)&(queue).end)) ? \ + (memmove((queue).head+(index)+1,(queue).head+(index), \ + ((queue).tail-(queue).head-(index))*sizeof(*(queue).start)), \ + *((queue).head+(index)) = value, \ + (queue).tail++, \ + 1) : \ + ((context)->error = YAML_MEMORY_ERROR, \ + 0)) + +/* + * Token initializers. + */ + +#define TOKEN_INIT(token,token_type,token_start_mark,token_end_mark) \ + (memset(&(token), 0, sizeof(yaml_token_t)), \ + (token).type = (token_type), \ + (token).start_mark = (token_start_mark), \ + (token).end_mark = (token_end_mark)) + +#define STREAM_START_TOKEN_INIT(token,token_encoding,start_mark,end_mark) \ + (TOKEN_INIT((token),YAML_STREAM_START_TOKEN,(start_mark),(end_mark)), \ + (token).data.stream_start.encoding = (token_encoding)) + +#define STREAM_END_TOKEN_INIT(token,start_mark,end_mark) \ + (TOKEN_INIT((token),YAML_STREAM_END_TOKEN,(start_mark),(end_mark))) + +#define ALIAS_TOKEN_INIT(token,token_value,start_mark,end_mark) \ + (TOKEN_INIT((token),YAML_ALIAS_TOKEN,(start_mark),(end_mark)), \ + (token).data.alias.value = (token_value)) + +#define ANCHOR_TOKEN_INIT(token,token_value,start_mark,end_mark) \ + (TOKEN_INIT((token),YAML_ANCHOR_TOKEN,(start_mark),(end_mark)), \ + (token).data.anchor.value = (token_value)) + +#define TAG_TOKEN_INIT(token,token_handle,token_suffix,start_mark,end_mark) \ + (TOKEN_INIT((token),YAML_TAG_TOKEN,(start_mark),(end_mark)), \ + (token).data.tag.handle = (token_handle), \ + (token).data.tag.suffix = (token_suffix)) + +#define SCALAR_TOKEN_INIT(token,token_value,token_length,token_style,start_mark,end_mark) \ + (TOKEN_INIT((token),YAML_SCALAR_TOKEN,(start_mark),(end_mark)), \ + (token).data.scalar.value = (token_value), \ + (token).data.scalar.length = (token_length), \ + (token).data.scalar.style = (token_style)) + +#define VERSION_DIRECTIVE_TOKEN_INIT(token,token_major,token_minor,start_mark,end_mark) \ + (TOKEN_INIT((token),YAML_VERSION_DIRECTIVE_TOKEN,(start_mark),(end_mark)), \ + (token).data.version_directive.major = (token_major), \ + (token).data.version_directive.minor = (token_minor)) + +#define TAG_DIRECTIVE_TOKEN_INIT(token,token_handle,token_prefix,start_mark,end_mark) \ + (TOKEN_INIT((token),YAML_TAG_DIRECTIVE_TOKEN,(start_mark),(end_mark)), \ + (token).data.tag_directive.handle = (token_handle), \ + (token).data.tag_directive.prefix = (token_prefix)) + +/* + * Event initializers. + */ + +#define EVENT_INIT(event,event_type,event_start_mark,event_end_mark) \ + (memset(&(event), 0, sizeof(yaml_event_t)), \ + (event).type = (event_type), \ + (event).start_mark = (event_start_mark), \ + (event).end_mark = (event_end_mark)) + +#define STREAM_START_EVENT_INIT(event,event_encoding,start_mark,end_mark) \ + (EVENT_INIT((event),YAML_STREAM_START_EVENT,(start_mark),(end_mark)), \ + (event).data.stream_start.encoding = (event_encoding)) + +#define STREAM_END_EVENT_INIT(event,start_mark,end_mark) \ + (EVENT_INIT((event),YAML_STREAM_END_EVENT,(start_mark),(end_mark))) + +#define DOCUMENT_START_EVENT_INIT(event,event_version_directive, \ + event_tag_directives_start,event_tag_directives_end,event_implicit,start_mark,end_mark) \ + (EVENT_INIT((event),YAML_DOCUMENT_START_EVENT,(start_mark),(end_mark)), \ + (event).data.document_start.version_directive = (event_version_directive), \ + (event).data.document_start.tag_directives.start = (event_tag_directives_start), \ + (event).data.document_start.tag_directives.end = (event_tag_directives_end), \ + (event).data.document_start.implicit = (event_implicit)) + +#define DOCUMENT_END_EVENT_INIT(event,event_implicit,start_mark,end_mark) \ + (EVENT_INIT((event),YAML_DOCUMENT_END_EVENT,(start_mark),(end_mark)), \ + (event).data.document_end.implicit = (event_implicit)) + +#define ALIAS_EVENT_INIT(event,event_anchor,start_mark,end_mark) \ + (EVENT_INIT((event),YAML_ALIAS_EVENT,(start_mark),(end_mark)), \ + (event).data.alias.anchor = (event_anchor)) + +#define SCALAR_EVENT_INIT(event,event_anchor,event_tag,event_value,event_length, \ + event_plain_implicit, event_quoted_implicit,event_style,start_mark,end_mark) \ + (EVENT_INIT((event),YAML_SCALAR_EVENT,(start_mark),(end_mark)), \ + (event).data.scalar.anchor = (event_anchor), \ + (event).data.scalar.tag = (event_tag), \ + (event).data.scalar.value = (event_value), \ + (event).data.scalar.length = (event_length), \ + (event).data.scalar.plain_implicit = (event_plain_implicit), \ + (event).data.scalar.quoted_implicit = (event_quoted_implicit), \ + (event).data.scalar.style = (event_style)) + +#define SEQUENCE_START_EVENT_INIT(event,event_anchor,event_tag, \ + event_implicit,event_style,start_mark,end_mark) \ + (EVENT_INIT((event),YAML_SEQUENCE_START_EVENT,(start_mark),(end_mark)), \ + (event).data.sequence_start.anchor = (event_anchor), \ + (event).data.sequence_start.tag = (event_tag), \ + (event).data.sequence_start.implicit = (event_implicit), \ + (event).data.sequence_start.style = (event_style)) + +#define SEQUENCE_END_EVENT_INIT(event,start_mark,end_mark) \ + (EVENT_INIT((event),YAML_SEQUENCE_END_EVENT,(start_mark),(end_mark))) + +#define MAPPING_START_EVENT_INIT(event,event_anchor,event_tag, \ + event_implicit,event_style,start_mark,end_mark) \ + (EVENT_INIT((event),YAML_MAPPING_START_EVENT,(start_mark),(end_mark)), \ + (event).data.mapping_start.anchor = (event_anchor), \ + (event).data.mapping_start.tag = (event_tag), \ + (event).data.mapping_start.implicit = (event_implicit), \ + (event).data.mapping_start.style = (event_style)) + +#define MAPPING_END_EVENT_INIT(event,start_mark,end_mark) \ + (EVENT_INIT((event),YAML_MAPPING_END_EVENT,(start_mark),(end_mark))) + +/* + * Document initializer. + */ + +#define DOCUMENT_INIT(document,document_nodes_start,document_nodes_end, \ + document_version_directive,document_tag_directives_start, \ + document_tag_directives_end,document_start_implicit, \ + document_end_implicit,document_start_mark,document_end_mark) \ + (memset(&(document), 0, sizeof(yaml_document_t)), \ + (document).nodes.start = (document_nodes_start), \ + (document).nodes.end = (document_nodes_end), \ + (document).nodes.top = (document_nodes_start), \ + (document).version_directive = (document_version_directive), \ + (document).tag_directives.start = (document_tag_directives_start), \ + (document).tag_directives.end = (document_tag_directives_end), \ + (document).start_implicit = (document_start_implicit), \ + (document).end_implicit = (document_end_implicit), \ + (document).start_mark = (document_start_mark), \ + (document).end_mark = (document_end_mark)) + +/* + * Node initializers. + */ + +#define NODE_INIT(node,node_type,node_tag,node_start_mark,node_end_mark) \ + (memset(&(node), 0, sizeof(yaml_node_t)), \ + (node).type = (node_type), \ + (node).tag = (node_tag), \ + (node).start_mark = (node_start_mark), \ + (node).end_mark = (node_end_mark)) + +#define SCALAR_NODE_INIT(node,node_tag,node_value,node_length, \ + node_style,start_mark,end_mark) \ + (NODE_INIT((node),YAML_SCALAR_NODE,(node_tag),(start_mark),(end_mark)), \ + (node).data.scalar.value = (node_value), \ + (node).data.scalar.length = (node_length), \ + (node).data.scalar.style = (node_style)) + +#define SEQUENCE_NODE_INIT(node,node_tag,node_items_start,node_items_end, \ + node_style,start_mark,end_mark) \ + (NODE_INIT((node),YAML_SEQUENCE_NODE,(node_tag),(start_mark),(end_mark)), \ + (node).data.sequence.items.start = (node_items_start), \ + (node).data.sequence.items.end = (node_items_end), \ + (node).data.sequence.items.top = (node_items_start), \ + (node).data.sequence.style = (node_style)) + +#define MAPPING_NODE_INIT(node,node_tag,node_pairs_start,node_pairs_end, \ + node_style,start_mark,end_mark) \ + (NODE_INIT((node),YAML_MAPPING_NODE,(node_tag),(start_mark),(end_mark)), \ + (node).data.mapping.pairs.start = (node_pairs_start), \ + (node).data.mapping.pairs.end = (node_pairs_end), \ + (node).data.mapping.pairs.top = (node_pairs_start), \ + (node).data.mapping.style = (node_style)) + |