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Dir : //opt/alt/ruby19/lib64/ruby/1.9.1/ripper/filter.rb

#
# $Id: filter.rb 25189 2009-10-02 12:04:37Z akr $
#
# 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,
  # and they are dispatched in the `right' order (same with input).
  class Filter

    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 parsing.  _init_ is a data accumulator.
    # It 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 have not defined.
    # _event_ is :on_XXX, _token_ is scanned token, _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