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author | yugui <yugui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2008-08-25 15:13:14 +0000 |
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committer | yugui <yugui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2008-08-25 15:13:14 +0000 |
commit | d0233291bc8a5068e52c69c210e5979e5324b5bc (patch) | |
tree | 7d9459449c33792c63eeb7baa071e76352e0baab /trunk/ext/ripper/lib/ripper/lexer.rb | |
parent | 0dc342de848a642ecce8db697b8fecd83a63e117 (diff) | |
parent | 72eaacaa15256ab95c3b52ea386f88586fb9da40 (diff) |
re-adding tag v1_9_0_4 as an alias of trunk@18848v1_9_0_4
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v1_9_0_4@18849 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'trunk/ext/ripper/lib/ripper/lexer.rb')
-rw-r--r-- | trunk/ext/ripper/lib/ripper/lexer.rb | 179 |
1 files changed, 0 insertions, 179 deletions
diff --git a/trunk/ext/ripper/lib/ripper/lexer.rb b/trunk/ext/ripper/lib/ripper/lexer.rb deleted file mode 100644 index 14ef99f034..0000000000 --- a/trunk/ext/ripper/lib/ripper/lexer.rb +++ /dev/null @@ -1,179 +0,0 @@ -# -# $Id$ -# -# Copyright (c) 2004,2005 Minero Aoki -# -# This program is free software. -# You can distribute and/or modify this program under the Ruby License. -# For details of Ruby License, see ruby/COPYING. -# - -require 'ripper/core' - -class Ripper - - # Tokenizes Ruby program and returns an Array of String. - def Ripper.tokenize(src, filename = '-', lineno = 1) - Lexer.new(src, filename, lineno).tokenize - end - - # Tokenizes Ruby program and returns an Array of Array, - # which is formatted like [[lineno, column], type, token]. - # - # require 'ripper' - # require 'pp' - # - # p Ripper.lex("def m(a) nil end") - # #=> [[[1, 0], :on_kw, "def"], - # [[1, 3], :on_sp, " " ], - # [[1, 4], :on_ident, "m" ], - # [[1, 5], :on_lparen, "(" ], - # [[1, 6], :on_ident, "a" ], - # [[1, 7], :on_rparen, ")" ], - # [[1, 8], :on_sp, " " ], - # [[1, 9], :on_kw, "nil"], - # [[1, 12], :on_sp, " " ], - # [[1, 13], :on_kw, "end"]] - # - def Ripper.lex(src, filename = '-', lineno = 1) - Lexer.new(src, filename, lineno).lex - end - - class Lexer < ::Ripper #:nodoc: internal use only - def tokenize - lex().map {|pos, event, tok| tok } - end - - def lex - parse().sort_by {|pos, event, tok| pos } - end - - def parse - @buf = [] - super - @buf - end - - private - - SCANNER_EVENTS.each do |event| - module_eval(<<-End, __FILE__+'/module_eval', __LINE__ + 1) - def on_#{event}(tok) - @buf.push [[lineno(), column()], :on_#{event}, tok] - end - End - end - end - - # [EXPERIMENTAL] - # Parses +src+ and return a string which was matched to +pattern+. - # +pattern+ should be described as Regexp. - # - # require 'ripper' - # - # p Ripper.slice('def m(a) nil end', 'ident') #=> "m" - # p Ripper.slice('def m(a) nil end', '[ident lparen rparen]+') #=> "m(a)" - # p Ripper.slice("<<EOS\nstring\nEOS", - # 'heredoc_beg nl $(tstring_content*) heredoc_end', 1) - # #=> "string\n" - # - def Ripper.slice(src, pattern, n = 0) - if m = token_match(src, pattern) - then m.string(n) - else nil - end - end - - def Ripper.token_match(src, pattern) #:nodoc: - TokenPattern.compile(pattern).match(src) - end - - class TokenPattern #:nodoc: - - class Error < ::StandardError; end - class CompileError < Error; end - class MatchError < Error; end - - class << self - alias compile new - end - - def initialize(pattern) - @source = pattern - @re = compile(pattern) - end - - def match(str) - match_list(::Ripper.lex(str)) - end - - def match_list(tokens) - if m = @re.match(map_tokens(tokens)) - then MatchData.new(tokens, m) - else nil - end - end - - private - - def compile(pattern) - if m = /[^\w\s$()\[\]{}?*+\.]/.match(pattern) - raise CompileError, "invalid char in pattern: #{m[0].inspect}" - end - buf = '' - pattern.scan(/(?:\w+|\$\(|[()\[\]\{\}?*+\.]+)/) do |tok| - case tok - when /\w/ - buf.concat map_token(tok) - when '$(' - buf.concat '(' - when '(' - buf.concat '(?:' - when /[?*\[\])\.]/ - buf.concat tok - else - raise 'must not happen' - end - end - Regexp.compile(buf) - rescue RegexpError => err - raise CompileError, err.message - end - - def map_tokens(tokens) - tokens.map {|pos,type,str| map_token(type.to_s.sub(/\Aon_/,'')) }.join - end - - MAP = {} - seed = ('a'..'z').to_a + ('A'..'Z').to_a + ('0'..'9').to_a - SCANNER_EVENT_TABLE.each do |ev, | - raise CompileError, "[RIPPER FATAL] too many system token" if seed.empty? - MAP[ev.to_s.sub(/\Aon_/,'')] = seed.shift - end - - def map_token(tok) - MAP[tok] or raise CompileError, "unknown token: #{tok}" - end - - class MatchData - def initialize(tokens, match) - @tokens = tokens - @match = match - end - - def string(n = 0) - return nil unless @match - match(n).join - end - - private - - def match(n = 0) - return [] unless @match - @tokens[@match.begin(n)...@match.end(n)].map {|pos,type,str| str } - end - end - - end - -end |