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# frozen_string_literal: false # # $Id: filter.rb 53143 2015-12-16 05:31:54Z naruse $ # # 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/lexer' class Ripper # This class handles only scanner events, # which are dispatched in the 'right' order (same with input). class Filter # Creates a new Ripper::Filter instance, passes parameters +src+, # +filename+, and +lineno+ to Ripper::Lexer.new # # The lexer is for internal use only. def initialize(src, filename = '-', lineno = 1) @__lexer = Lexer.new(src, filename, lineno) @__line = nil @__col = nil end # The file name of the input. def filename @__lexer.filename end # The line number of the current token. # This value starts from 1. # This method is valid only in event handlers. def lineno @__line end # The column number of the current token. # This value starts from 0. # This method is valid only in event handlers. def column @__col end # Starts the parser. # +init+ is a data accumulator and is passed to the next event handler (as # of Enumerable#inject). def parse(init = nil) data = init @__lexer.lex.each do |pos, event, tok| @__line, @__col = *pos data = if respond_to?(event, true) then __send__(event, tok, data) else on_default(event, tok, data) end end data end private # This method is called when some event handler is undefined. # +event+ is :on_XXX, +token+ is the scanned token, and +data+ is a data # accumulator. # # The return value of this method is passed to the next event handler (as # of Enumerable#inject). def on_default(event, token, data) data end end end
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