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-rw-r--r--ext/json/lib/json/pure/generator.rb394
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diff --git a/ext/json/lib/json/pure/generator.rb b/ext/json/lib/json/pure/generator.rb
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--- a/ext/json/lib/json/pure/generator.rb
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-module JSON
- MAP = {
- "\x0" => '\u0000',
- "\x1" => '\u0001',
- "\x2" => '\u0002',
- "\x3" => '\u0003',
- "\x4" => '\u0004',
- "\x5" => '\u0005',
- "\x6" => '\u0006',
- "\x7" => '\u0007',
- "\b" => '\b',
- "\t" => '\t',
- "\n" => '\n',
- "\xb" => '\u000b',
- "\f" => '\f',
- "\r" => '\r',
- "\xe" => '\u000e',
- "\xf" => '\u000f',
- "\x10" => '\u0010',
- "\x11" => '\u0011',
- "\x12" => '\u0012',
- "\x13" => '\u0013',
- "\x14" => '\u0014',
- "\x15" => '\u0015',
- "\x16" => '\u0016',
- "\x17" => '\u0017',
- "\x18" => '\u0018',
- "\x19" => '\u0019',
- "\x1a" => '\u001a',
- "\x1b" => '\u001b',
- "\x1c" => '\u001c',
- "\x1d" => '\u001d',
- "\x1e" => '\u001e',
- "\x1f" => '\u001f',
- '"' => '\"',
- '\\' => '\\\\',
- '/' => '\/',
- } # :nodoc:
-
- # Convert a UTF8 encoded Ruby string _string_ to a JSON string, encoded with
- # UTF16 big endian characters as \u????, and return it.
- def utf8_to_json(string) # :nodoc:
- string = string.dup.force_encoding(Encoding::ASCII_8BIT)
- string.gsub!(/["\\\/\x0-\x1f]/) { MAP[$&] }
- string.gsub!(/(
- (?:
- [\xc2-\xdf][\x80-\xbf] |
- [\xe0-\xef][\x80-\xbf]{2} |
- [\xf0-\xf4][\x80-\xbf]{3}
- )+ |
- [\x80-\xc1\xf5-\xff] # invalid
- )/nx) { |c|
- c.size == 1 and raise GeneratorError, "invalid utf8 byte: '#{c}'"
- c.unpack("U*").map{|c|
- c>0xFFFF ? ('\ud%03x\ud%03x'%[0x7C0+c/1024,0xC00+c%1024]) : ('\u%04x'%c)
- }.join("")
- }
- string
- end
- module_function :utf8_to_json
-
- module Pure
- module Generator
- # This class is used to create State instances, that are use to hold data
- # while generating a JSON text from a a Ruby data structure.
- class State
- # Creates a State object from _opts_, which ought to be Hash to create
- # a new State instance configured by _opts_, something else to create
- # an unconfigured instance. If _opts_ is a State object, it is just
- # returned.
- def self.from_state(opts)
- case opts
- when self
- opts
- when Hash
- new(opts)
- else
- new
- end
- end
-
- # Instantiates a new State object, configured by _opts_.
- #
- # _opts_ can have the following keys:
- #
- # * *indent*: a string used to indent levels (default: ''),
- # * *space*: a string that is put after, a : or , delimiter (default: ''),
- # * *space_before*: a string that is put before a : pair delimiter (default: ''),
- # * *object_nl*: a string that is put at the end of a JSON object (default: ''),
- # * *array_nl*: a string that is put at the end of a JSON array (default: ''),
- # * *check_circular*: true if checking for circular data structures
- # should be done (the default), false otherwise.
- # * *check_circular*: true if checking for circular data structures
- # should be done, false (the default) otherwise.
- # * *allow_nan*: true if NaN, Infinity, and -Infinity should be
- # generated, otherwise an exception is thrown, if these values are
- # encountered. This options defaults to false.
- def initialize(opts = {})
- @seen = {}
- @indent = ''
- @space = ''
- @space_before = ''
- @object_nl = ''
- @array_nl = ''
- @check_circular = true
- @allow_nan = false
- configure opts
- end
-
- # This string is used to indent levels in the JSON text.
- attr_accessor :indent
-
- # This string is used to insert a space between the tokens in a JSON
- # string.
- attr_accessor :space
-
- # This string is used to insert a space before the ':' in JSON objects.
- attr_accessor :space_before
-
- # This string is put at the end of a line that holds a JSON object (or
- # Hash).
- attr_accessor :object_nl
-
- # This string is put at the end of a line that holds a JSON array.
- attr_accessor :array_nl
-
- # This integer returns the maximum level of data structure nesting in
- # the generated JSON, max_nesting = 0 if no maximum is checked.
- attr_accessor :max_nesting
-
- def check_max_nesting(depth) # :nodoc:
- return if @max_nesting.zero?
- current_nesting = depth + 1
- current_nesting > @max_nesting and
- raise NestingError, "nesting of #{current_nesting} is too deep"
- end
-
- # Returns true, if circular data structures should be checked,
- # otherwise returns false.
- def check_circular?
- @check_circular
- end
-
- # Returns true if NaN, Infinity, and -Infinity should be considered as
- # valid JSON and output.
- def allow_nan?
- @allow_nan
- end
-
- # Returns _true_, if _object_ was already seen during this generating
- # run.
- def seen?(object)
- @seen.key?(object.__id__)
- end
-
- # Remember _object_, to find out if it was already encountered (if a
- # cyclic data structure is if a cyclic data structure is rendered).
- def remember(object)
- @seen[object.__id__] = true
- end
-
- # Forget _object_ for this generating run.
- def forget(object)
- @seen.delete object.__id__
- end
-
- # Configure this State instance with the Hash _opts_, and return
- # itself.
- def configure(opts)
- @indent = opts[:indent] if opts.key?(:indent)
- @space = opts[:space] if opts.key?(:space)
- @space_before = opts[:space_before] if opts.key?(:space_before)
- @object_nl = opts[:object_nl] if opts.key?(:object_nl)
- @array_nl = opts[:array_nl] if opts.key?(:array_nl)
- @check_circular = !!opts[:check_circular] if opts.key?(:check_circular)
- @allow_nan = !!opts[:allow_nan] if opts.key?(:allow_nan)
- if !opts.key?(:max_nesting) # defaults to 19
- @max_nesting = 19
- elsif opts[:max_nesting]
- @max_nesting = opts[:max_nesting]
- else
- @max_nesting = 0
- end
- self
- end
-
- # Returns the configuration instance variables as a hash, that can be
- # passed to the configure method.
- def to_h
- result = {}
- for iv in %w[indent space space_before object_nl array_nl check_circular allow_nan max_nesting]
- result[iv.intern] = instance_variable_get("@#{iv}")
- end
- result
- end
- end
-
- module GeneratorMethods
- module Object
- # Converts this object to a string (calling #to_s), converts
- # it to a JSON string, and returns the result. This is a fallback, if no
- # special method #to_json was defined for some object.
- def to_json(*) to_s.to_json end
- end
-
- module Hash
- # Returns a JSON string containing a JSON object, that is unparsed from
- # this Hash instance.
- # _state_ is a JSON::State object, that can also be used to configure the
- # produced JSON string output further.
- # _depth_ is used to find out nesting depth, to indent accordingly.
- def to_json(state = nil, depth = 0, *)
- if state
- state = JSON.state.from_state(state)
- state.check_max_nesting(depth)
- json_check_circular(state) { json_transform(state, depth) }
- else
- json_transform(state, depth)
- end
- end
-
- private
-
- def json_check_circular(state)
- if state and state.check_circular?
- state.seen?(self) and raise JSON::CircularDatastructure,
- "circular data structures not supported!"
- state.remember self
- end
- yield
- ensure
- state and state.forget self
- end
-
- def json_shift(state, depth)
- state and not state.object_nl.empty? or return ''
- state.indent * depth
- end
-
- def json_transform(state, depth)
- delim = ','
- delim << state.object_nl if state
- result = '{'
- result << state.object_nl if state
- result << map { |key,value|
- s = json_shift(state, depth + 1)
- s << key.to_s.to_json(state, depth + 1)
- s << state.space_before if state
- s << ':'
- s << state.space if state
- s << value.to_json(state, depth + 1)
- }.join(delim)
- result << state.object_nl if state
- result << json_shift(state, depth)
- result << '}'
- result
- end
- end
-
- module Array
- # Returns a JSON string containing a JSON array, that is unparsed from
- # this Array instance.
- # _state_ is a JSON::State object, that can also be used to configure the
- # produced JSON string output further.
- # _depth_ is used to find out nesting depth, to indent accordingly.
- def to_json(state = nil, depth = 0, *)
- if state
- state = JSON.state.from_state(state)
- state.check_max_nesting(depth)
- json_check_circular(state) { json_transform(state, depth) }
- else
- json_transform(state, depth)
- end
- end
-
- private
-
- def json_check_circular(state)
- if state and state.check_circular?
- state.seen?(self) and raise JSON::CircularDatastructure,
- "circular data structures not supported!"
- state.remember self
- end
- yield
- ensure
- state and state.forget self
- end
-
- def json_shift(state, depth)
- state and not state.array_nl.empty? or return ''
- state.indent * depth
- end
-
- def json_transform(state, depth)
- delim = ','
- delim << state.array_nl if state
- result = '['
- result << state.array_nl if state
- result << map { |value|
- json_shift(state, depth + 1) << value.to_json(state, depth + 1)
- }.join(delim)
- result << state.array_nl if state
- result << json_shift(state, depth)
- result << ']'
- result
- end
- end
-
- module Integer
- # Returns a JSON string representation for this Integer number.
- def to_json(*) to_s end
- end
-
- module Float
- # Returns a JSON string representation for this Float number.
- def to_json(state = nil, *)
- case
- when infinite?
- if !state || state.allow_nan?
- to_s
- else
- raise GeneratorError, "#{self} not allowed in JSON"
- end
- when nan?
- if !state || state.allow_nan?
- to_s
- else
- raise GeneratorError, "#{self} not allowed in JSON"
- end
- else
- to_s
- end
- end
- end
-
- module String
- # This string should be encoded with UTF-8 A call to this method
- # returns a JSON string encoded with UTF16 big endian characters as
- # \u????.
- def to_json(*)
- '"' << JSON.utf8_to_json(self) << '"'
- end
-
- # Module that holds the extinding methods if, the String module is
- # included.
- module Extend
- # Raw Strings are JSON Objects (the raw bytes are stored in an array for the
- # key "raw"). The Ruby String can be created by this module method.
- def json_create(o)
- o['raw'].pack('C*')
- end
- end
-
- # Extends _modul_ with the String::Extend module.
- def self.included(modul)
- modul.extend Extend
- end
-
- # This method creates a raw object hash, that can be nested into
- # other data structures and will be unparsed as a raw string. This
- # method should be used, if you want to convert raw strings to JSON
- # instead of UTF-8 strings, e. g. binary data.
- def to_json_raw_object
- {
- JSON.create_id => self.class.name,
- 'raw' => self.unpack('C*'),
- }
- end
-
- # This method creates a JSON text from the result of
- # a call to to_json_raw_object of this String.
- def to_json_raw(*args)
- to_json_raw_object.to_json(*args)
- end
- end
-
- module TrueClass
- # Returns a JSON string for true: 'true'.
- def to_json(*) 'true' end
- end
-
- module FalseClass
- # Returns a JSON string for false: 'false'.
- def to_json(*) 'false' end
- end
-
- module NilClass
- # Returns a JSON string for nil: 'null'.
- def to_json(*) 'null' end
- end
- end
- end
- end
-end