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3c83a94ea9
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65157 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
52 lines
1.4 KiB
Ruby
52 lines
1.4 KiB
Ruby
#! /your/favourite/path/to/ruby
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# -*- mode: ruby; coding: utf-8; indent-tabs-mode: nil; ruby-indent-level: 2 -*-
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# -*- frozen_string_literal: true; -*-
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# -*- warn_indent: true; -*-
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#
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# Copyright (c) 2017 Urabe, Shyouhei. All rights reserved.
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#
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# This file is a part of the programming language Ruby. Permission is hereby
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# granted, to either redistribute and/or modify this file, provided that the
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# conditions mentioned in the file COPYING are met. Consult the file for
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# details.
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require 'pathname'
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# Poor man's StringScanner.
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# Sadly https://bugs.ruby-lang.org/issues/8343 is not backported to 2.0. We
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# have to do it by hand.
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class RubyVM::Scanner
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attr_reader :__FILE__
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attr_reader :__LINE__
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def initialize path
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src = Pathname.new(__FILE__).relative_path_from(Pathname.pwd).dirname
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src += path
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@__LINE__ = 1
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@__FILE__ = src.to_path
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@str = src.read mode: 'rt:utf-8:utf-8'
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@pos = 0
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end
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def eos?
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return @pos >= @str.length
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end
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def scan re
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ret = @__LINE__
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@last_match = @str.match re, @pos
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return unless @last_match
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@__LINE__ += @last_match.to_s.count "\n"
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@pos = @last_match.end 0
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return ret
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end
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def scan! re
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scan re or raise sprintf "parse error at %s:%d near:\n %s...", \
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@__FILE__, @__LINE__, @str[@pos, 32]
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end
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def [] key
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return @last_match[key]
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end
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end
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