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Edit File : filter.rb \| Size : 1.90 KB
# # $Id: filter.rb 36954 2012-09-12 23:04:41Z zzak $ # # 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 Back

Edit File : filter.rb | Size : 1.90 KB

#
# $Id: filter.rb 36954 2012-09-12 23:04:41Z zzak $
#
# 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

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