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Viewing changes to lib/rabbit/parser/rd.rb

  • Committer: Bazaar Package Importer
  • Author(s): Youhei SASAKI
  • Date: 2009-07-22 22:15:37 UTC
  • Revision ID: james.westby@ubuntu.com-20090722221537-iy7foj73p2kyuumi
Tags: upstream-0.6.1
Import upstream version 0.6.1

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lib/rabbit/parser/rd.rb
 
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require "rabbit/parser/base"
 
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module Rabbit
 
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  module Parser
 
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    class RD < Base
 
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      push_loader(self)
 
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      class << self
 
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        def match?(source)
 
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          /^= /.match(source.read)
 
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        end
 
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      end
 
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      def parse
 
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        source = "=begin\n#{@source.read}\n=end\n"
 
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        tree = ::RD::RDTree.new(source)
 
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        visitor = RD2RabbitVisitor.new(@canvas)
 
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        visitor.visit(tree)
 
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      rescue Racc::ParseError
 
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        message = format_parse_error_message($!.message, source)
 
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        raise ParseError.new, message, $@
 
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      end
 
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      private
 
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      def format_parse_error_message(message, source)
 
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        if /line (\d+):/.match(message)
 
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          numbered_source = add_number(source, $1.to_i)
 
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        else
 
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          numbered_source = add_number(source)
 
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        end
 
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        "#{message}\n--\n#{numbered_source}"
 
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      end
 
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      SNIPPET_SIZE = 10
 
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      def add_number(source, around=nil)
 
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        i = 1
 
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        puts source
 
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        lines = source.to_a[0..-2]
 
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        if around
 
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          i = [1, around - SNIPPET_SIZE].max
 
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          lines = lines[i, 2 * SNIPPET_SIZE]
 
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        end
 
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        format = "%#{Math.log10(lines.size).truncate + 1}d %s"
 
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        lines.collect do |line|
 
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          i += 1
 
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          format % [i, line]
 
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        end.join
 
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      end
 
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    end
 
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  end
 
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end
 
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require "rabbit/parser/rd/rd2rabbit-lib"