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require 'rdoc'
require 'rdoc/code_objects'
require 'rdoc/markup/preprocess'
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$/ # <<<<
#
# def initialize(file_name, body, options)
# ...
# end
#
# def scan
# ...
# end
# end
#
# Just to make life interesting, if we suspect a plain text file, we also
# look for a shebang line just in case it's a potential shell script
class RDoc::Parser
@parsers = []
class << self
attr_reader :parsers
end
##
# Alias an extension to another extension. After this call, files ending
# "new_ext" will be parsed using the same parser as "old_ext"
def self.alias_extension(old_ext, new_ext)
old_ext = old_ext.sub(/^\.(.*)/, '\1')
new_ext = new_ext.sub(/^\.(.*)/, '\1')
parser = can_parse "xxx.#{old_ext}"
return false unless parser
RDoc::Parser.parsers.unshift [/\.#{new_ext}$/, parser]
true
end
##
# Return _true_ if the +file+ seems like binary.
def self.binary?(file)
s = File.read(file, 1024) or return false
s.count("^ -~\t\r\n").fdiv(s.size) > 0.3 || s.index("\x00")
end
private_class_method :binary?
##
# 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
#
# The default parser should *NOT* parse binary files.
#
if parser == RDoc::Parser::Simple then
if binary? file_name then
return nil
end
end
return 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)
# 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
#
# This method must return a parser.
#
if !parser then
parser = RDoc::Parser::Simple
end
parser.new top_level, file_name, body, options, stats
end
##
# Record which file types this parser can understand.
def self.parse_files_matching(regexp)
RDoc::Parser.parsers.unshift [regexp, self]
end
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'
|
