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Diffstat (limited to 'lib/rdoc/markup/pre_process.rb')
-rw-r--r-- | lib/rdoc/markup/pre_process.rb | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/lib/rdoc/markup/pre_process.rb b/lib/rdoc/markup/pre_process.rb new file mode 100644 index 0000000000..e59bd227b7 --- /dev/null +++ b/lib/rdoc/markup/pre_process.rb @@ -0,0 +1,151 @@ +require 'rdoc/markup' +require 'rdoc/encoding' + +## +# Handle common directives that can occur in a block of text: +# +# \:include: filename +# +# Directives can be escaped by preceding them with a backslash. +# +# RDoc plugin authors can register additional directives to be handled by +# using RDoc::Markup::PreProcess::register + +class RDoc::Markup::PreProcess + + @registered = {} + + ## + # Registers +directive+ as one handled by RDoc. If a block is given the + # directive will be replaced by the result of the block, otherwise the + # directive will be removed from the processed text. + + def self.register directive, &block + @registered[directive] = block + end + + ## + # Registered directives + + def self.registered + @registered + end + + ## + # Creates a new pre-processor for +input_file_name+ that will look for + # included files in +include_path+ + + def initialize(input_file_name, include_path) + @input_file_name = input_file_name + @include_path = include_path + end + + ## + # Look for directives in a chunk of +text+. + # + # Options that we don't handle are yielded. If the block returns false the + # directive is restored to the text. If the block returns nil or no block + # was given the directive is handled according to the registered directives. + # If a String was returned the directive is replaced with the string. + # + # If no matching directive was registered the directive is restored to the + # text. + # + # If +code_object+ is given and the param is set as metadata on the + # +code_object+. See RDoc::CodeObject#metadata + + def handle text, code_object = nil + # regexp helper (square brackets for optional) + # $1 $2 $3 $4 $5 + # [prefix][\]:directive:[spaces][param]newline + text.gsub!(/^([ \t]*#?[ \t]*)(\\?):(\w+):([ \t]*)(.+)?\n/) do + # skip something like ':toto::' + next $& if $4.empty? and $5 and $5[0, 1] == ':' + + # skip if escaped + next "#$1:#$3:#$4#$5\n" unless $2.empty? + + prefix = $1 + directive = $3.downcase + param = $5 + + case directive + when 'include' then + filename = param.split[0] + encoding = if defined?(Encoding) then text.encoding else nil end + include_file filename, prefix, encoding + else + result = yield directive, param if block_given? + + case result + when nil then + code_object.metadata[directive] = param if code_object + if RDoc::Markup::PreProcess.registered.include? directive then + handler = RDoc::Markup::PreProcess.registered[directive] + result = handler.call directive, param if handler + else + result = "#{prefix}:#{directive}: #{param}\n" + end + when false then + result = "#{prefix}:#{directive}: #{param}\n" + end + + result + end + end + + text + end + + ## + # Handles the <tt>:include: _filename_</tt> directive. + # + # If the first line of the included file starts with '#', and contains + # an encoding information in the form 'coding:' or 'coding=', it is + # removed. + # + # If all lines in the included file start with a '#', this leading '#' + # is removed before inclusion. The included content is indented like + # the <tt>:include:</tt> directive. + #-- + # so all content will be verbatim because of the likely space after '#'? + # TODO shift left the whole file content in that case + # TODO comment stop/start #-- and #++ in included file must be processed here + + def include_file name, indent, encoding + full_name = find_include_file name + + unless full_name then + warn "Couldn't find file to include '#{name}' from #{@input_file_name}" + return '' + end + + content = RDoc::Encoding.read_file full_name, encoding + + # strip magic comment + content = content.sub(/\A# .*coding[=:].*$/, '').lstrip + + # strip leading '#'s, but only if all lines start with them + if content =~ /^[^#]/ then + content.gsub(/^/, indent) + else + content.gsub(/^#?/, indent) + end + end + + ## + # Look for the given file in the directory containing the current file, + # and then in each of the directories specified in the RDOC_INCLUDE path + + def find_include_file(name) + to_search = [File.dirname(@input_file_name)].concat @include_path + to_search.each do |dir| + full_name = File.join(dir, name) + stat = File.stat(full_name) rescue next + return full_name if stat.readable? + end + nil + end + +end + |