/usr/lib/ruby/1.8/migemo-regex.rb is in migemo 0.40-10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Ruby/Migemo - a library for Japanese incremental search.
#
# Copyright (C) 2001 Satoru Takabayashi <satoru@namazu.org>
# All rights reserved.
# This is free software with ABSOLUTELY NO WARRANTY.
#
# You can redistribute it and/or modify it under the terms of
# the GNU General Public License version 2.
#
# NOTE: Ruby/Migemo can work only with EUC_JP encoding. ($KCODE="e")
#
module MigemoRegex
class RegexAlternation < Array
def sort
self.clone.replace(super)
end
def uniq
self.clone.replace(super)
end
def map
self.clone.replace(super {|x| yield(x)})
end
def delete_if
self.clone.replace(super {|x| yield(x)})
end
def select
self.clone.replace(super {|x| yield(x)})
end
end
class RegexConcatnation < Array
def map
self.clone.replace(super {|x| yield(x)})
end
end
class RegexCharClass < Array
end
class RegexCompiler
def initialize
@regex = RegexAlternation.new
end
attr_reader :regex
private
# ["$B1?(B", "$B1?F0(B", "$B1?E>(B", "$BF|K\(B", "$BF|K\8l(B"] => ["$B0B(B" "$B1?(B" "$BF|K\(B"]
# ($B1?(B|$B1?F0(B|$B1?E>(B|$BF|K\(B|$BF|K\8l(B) => ($B0B(B|$B1?(B|$BF|K\(B)
def optimize1 (regex)
prefixpat = nil
regex.sort.select do |word|
if prefixpat && prefixpat.match(word) then
false # excluded
else
prefixpat = Regexp.new(word.quotemeta)
true # included
end
end
end
# ($B$"$"$"(B|$B$"$"$$(B|$B$"$"$&(B)
# => ($B$"(B($B$"(B($B$"(B|$B$$(B|$B$&(B)))
def optimize2 (regex)
tmpregex = regex.sort.clone # I wish Array#cdr were available...
optimized = RegexAlternation.new
until tmpregex.empty?
head = tmpregex.shift
initial = head.first
friends = RegexAlternation.new
while item = tmpregex.first
if initial == item.first
friends.push(item.rest)
tmpregex.shift
else
break
end
end
if friends.empty?
optimized.push head
else
concat = RegexConcatnation.new
concat.push(initial)
friends.unshift(head.rest)
concat.push(optimize2(friends))
optimized.push(concat)
end
end
return optimized
end
# ($B$"(B|$B$$(B|$B$&(B|$B$((B|$B$*(B)
# => [$B$"$$$&$($*(B]
def optimize3 (regex)
charclass = RegexCharClass.new
if regex.instance_of?(RegexAlternation)
regex.delete_if do |x|
if x.instance_of?(String) && x =~ /^.$/ then
charclass.push(x)
true
end
end
end
if charclass.length == 1
regex.unshift charclass.first
elsif charclass.length > 1
regex.unshift charclass
end
regex.map do |x|
if x.instance_of?(RegexAlternation) || x.instance_of?(RegexConcatnation)
optimize3(x)
else
x
end
end
end
public
def push (item)
@regex.push(item)
end
def uniq
@regex.uniq
end
def optimize (level)
@regex = optimize1(@regex) if level >= 1
@regex = optimize2(@regex) if level >= 2
@regex = optimize3(@regex) if level >= 3
end
end
class RegexMetachars
def initialize
@bar = '|'
@lparen = '('
@rparen = ')'
end
attr_accessor :bar
attr_accessor :lparen
attr_accessor :rparen
end
class RegexEgrepMetachars < RegexMetachars
end
class RegexPerlMetachars < RegexMetachars
def initialize
@bar = '|'
@lparen = '(?:'
@rparen = ')'
end
end
class RegexRubyMetachars < RegexMetachars
end
class RegexEmacsMetachars < RegexMetachars
def initialize
@bar = '\\|'
@lparen = '\\('
@rparen = '\\)'
end
end
class RegexRenderer
def initialize (regex, insertion)
raise if regex == nil
@regex = regex
@meta = RegexMetachars.new
@insertion = insertion
@with_paren = false
end
attr_accessor :with_paren
private
def render_alternation (regex)
if regex.length == 0
raise
elsif regex.length == 1
render0(regex[0])
else
@meta.lparen +
regex.map {|x| render0(x) }.join(@meta.bar) +
@meta.rparen
end
end
def render_concatnation (regex)
regex.map {|x| render0(x) }.join(@insertion)
end
def escape_string (string)
string.quotemeta
end
def escape_charclass (string)
string.gsub(/\\/, '\\\\\\')
end
def render_charclass (regex)
if regex.delete("-")
regex.push("-") # move "-" to the end of Array.
end
if regex.delete("]")
regex.unshift("]") # move "]" to the beginning of Array.
end
escape_charclass("[" + regex.join + "]")
end
def insert (string)
if @insertion != ""
tmp = string.gsub(/(\\.|.)/, "\\1#{@insertion}")
tmp = tmp.sub(/#{@insertion.quotemeta}$/, "")
else
string
end
end
def render_string (regex)
insert(escape_string(regex))
end
def render0 (x)
if x.instance_of?(RegexAlternation)
render_alternation(x)
elsif x.instance_of?(RegexConcatnation)
render_concatnation(x)
elsif x.instance_of?(RegexCharClass)
render_charclass(x)
elsif x.instance_of?(String)
render_string(x)
else
raise "unexpected type: #{x} of #{x.class}"
end
end
public
def render
if @with_paren # e.g. "(a|b|c)"
render0(@regex)
else # e.g. "a|b|c"
@regex.map do |x|
render0(x)
end.join @meta.bar
end
end
def join_regexes (string, regexes)
([string] + regexes).join @meta.bar
end
end
class RegexPerlRenderer < RegexRenderer
def initialize (regex, insertion)
super(regex, insertion)
@meta = RegexPerlMetachars.new
end
end
class RegexRubyRenderer < RegexPerlRenderer
end
class RegexEgrepRenderer < RegexRenderer
end
class RegexEmacsRenderer < RegexRenderer
def initialize (regex, insertion)
super(regex, insertion)
@meta = RegexEmacsMetachars.new
end
def escape_string (string)
str = string.quotemeta
str.gsub!(/\\\(/, "(")
str.gsub!(/\\\)/, ")")
str.gsub!(/\\\|/, "|")
str.gsub!(/\\\</, "<")
str.gsub!(/\\\>/, ">")
str.gsub!(/\\\=/, "=")
str.gsub!(/\\\'/, "'")
str.gsub!(/\\\`/, "`")
str.gsub!(/\\\{/, "{")
str
end
def escape_charclass (string)
string
end
end
module RegexMetacharsFactory
def new (type)
case type
when nil
RegexRubyMetachars.new
when "emacs"
RegexEmacsMetachars.new
when "perl"
RegexPerlMetachars.new
when "ruby"
RegexRubyMetachars.new
when "egrep"
RegexEgrepMetachars.new
else
raise "Unknown type: #{type}"
end
end
module_function :new
end
module RegexRendererFactory
def new (regex, type, insertion)
case type
when nil
RegexRubyRenderer.new(regex, insertion)
when "emacs"
RegexEmacsRenderer.new(regex, insertion)
when "perl"
RegexPerlRenderer.new(regex, insertion)
when "ruby"
RegexRubyRenderer.new(regex, insertion)
when "egrep"
RegexEgrepRenderer.new(regex, insertion)
else
raise "Unknown type: #{regex}"
end
end
module_function :new
end
end
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