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require 'rdoc'
require 'rdoc/code_objects'
require 'rdoc/markup/pre_process'
require 'rdoc/stats'
##
# A parser is simple a class that implements
#
# #initialize(file_name, body, options)
#
# and
#
# #scan
#
# The initialize method takes a file name to be used, the body of the file,
# and an RDoc::Options object. The scan method is then called to return an
# appropriately parsed TopLevel code object.
#
# The ParseFactory is used to redirect to the correct parser given a
# filename extension. This magic works because individual parsers have to
# register themselves with us as they are loaded in. The do this using the
# following incantation
#
# require "rdoc/parser"
#
# class RDoc::Parser::Xyz < RDoc::Parser
# parse_files_matching /\.xyz$/ # <<<<
#
# def initialize(file_name, body, options)
# ...
# end
#
# def scan
# ...
# end
# end
#
# Just to make life interesting, if we suspect a plain text file, we also
# look for a shebang line just in case it's a potential shell script
class RDoc::Parser
@parsers = []
class << self
##
# A Hash that maps file extensions regular expressions to parsers that
# will consume them.
#
# Use parse_files_matching to register a parser's file extensions.
attr_reader :parsers
end
##
# Alias an extension to another extension. After this call, files ending
# "new_ext" will be parsed using the same parser as "old_ext"
def self.alias_extension(old_ext, new_ext)
old_ext = old_ext.sub(/^\.(.*)/, '\1')
new_ext = new_ext.sub(/^\.(.*)/, '\1')
parser = can_parse "xxx.#{old_ext}"
return false unless parser
RDoc::Parser.parsers.unshift [/\.#{new_ext}$/, parser]
true
end
##
# Determines if the file is a "binary" file which basically means it has
# content that an RDoc parser shouldn't try to consume.
def self.binary?(file)
return false if file =~ /\.(rdoc|txt)$/
s = File.read(file, 1024) or return false
have_encoding = s.respond_to? :encoding
if have_encoding then
return false if s.encoding != Encoding::ASCII_8BIT and s.valid_encoding?
end
return true if s[0, 2] == Marshal.dump('')[0, 2] or s.index("\x00")
if have_encoding then
s.force_encoding Encoding.default_external
not s.valid_encoding?
else
if 0.respond_to? :fdiv then
s.count("\x00-\x7F", "^ -~\t\r\n").fdiv(s.size) > 0.3
else # HACK 1.8.6
(s.count("\x00-\x7F", "^ -~\t\r\n").to_f / s.size) > 0.3
end
end
end
##
# Processes common directives for CodeObjects for the C and Ruby parsers.
#
# Applies +directive+'s +value+ to +code_object+, if appropriate
def self.process_directive code_object, directive, value
case directive
when 'nodoc' then
code_object.document_self = nil # notify nodoc
code_object.document_children = value.downcase != 'all'
when 'doc' then
code_object.document_self = true
code_object.force_documentation = true
when 'yield', 'yields' then
# remove parameter &block
code_object.params.sub!(/,?\s*&\w+/, '') if code_object.params
code_object.block_params = value
when 'arg', 'args' then
code_object.params = value
end
end
##
# Checks if +file+ is a zip file in disguise. Signatures from
# http://www.garykessler.net/library/file_sigs.html
def self.zip? file
zip_signature = File.read file, 4
zip_signature == "PK\x03\x04" or
zip_signature == "PK\x05\x06" or
zip_signature == "PK\x07\x08"
end
##
# Return a parser that can handle a particular extension
def self.can_parse(file_name)
parser = RDoc::Parser.parsers.find { |regexp,| regexp =~ file_name }.last
# HACK Selenium hides a jar file using a .txt extension
return if parser == RDoc::Parser::Simple and zip? file_name
# The default parser must not parse binary files
ext_name = File.extname file_name
return parser if ext_name.empty?
return if parser == RDoc::Parser::Simple and ext_name !~ /txt|rdoc/
parser
end
##
# Find the correct parser for a particular file name. Return a SimpleParser
# for ones that we don't know
def self.for(top_level, file_name, body, options, stats)
return if binary? file_name
# If no extension, look for shebang
if file_name !~ /\.\w+$/ && body =~ %r{\A#!(.+)} then
shebang = $1
case shebang
when %r{env\s+ruby}, %r{/ruby}
file_name = "dummy.rb"
end
end
parser = can_parse file_name
return unless parser
parser.new top_level, file_name, body, options, stats
end
##
# Record which file types this parser can understand.
#
# It is ok to call this multiple times.
def self.parse_files_matching(regexp)
RDoc::Parser.parsers.unshift [regexp, self]
end
##
# Creates a new Parser storing +top_level+, +file_name+, +content+,
# +options+ and +stats+ in instance variables.
#
# Usually invoked by +super+
def initialize(top_level, file_name, content, options, stats)
@top_level = top_level
@file_name = file_name
@content = content
@options = options
@stats = stats
end
end
require 'rdoc/parser/simple'
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