diff options
Diffstat (limited to 'tool/ruby_vm/helpers/scanner.rb')
-rw-r--r-- | tool/ruby_vm/helpers/scanner.rb | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/tool/ruby_vm/helpers/scanner.rb b/tool/ruby_vm/helpers/scanner.rb new file mode 100644 index 0000000000..3dce6ffdfe --- /dev/null +++ b/tool/ruby_vm/helpers/scanner.rb @@ -0,0 +1,49 @@ +#! /your/favourite/path/to/ruby +# -*- mode: ruby; coding: utf-8; indent-tabs-mode: nil; ruby-indent-level: 2 -*- +# -*- frozen_string_literal: true; -*- +# -*- warn_indent: true; -*- +# +# Copyright (c) 2017 Urabe, Shyouhei. All rights reserved. +# +# This file is a part of the programming language Ruby. Permission is hereby +# granted, to either redistribute and/or modify this file, provided that the +# conditions mentioned in the file COPYING are met. Consult the file for +# details. + +require 'pathname' +require 'strscan' + +class RubyVM::Scanner + attr_reader :__FILE__ + attr_reader :__LINE__ + + def initialize path + src = Pathname.new __dir__ + src += path + @__LINE__ = 1 + @__FILE__ = src.realpath.to_path + str = src.read mode: 'rt:utf-8:utf-8' + @scanner = StringScanner.new str + end + + def eos? + @scanner.eos? + end + + def scan re + ret = @__LINE__ + match = @scanner.scan re + return unless match + @__LINE__ += match.count "\n" + return ret + end + + def scan! re + scan re or raise sprintf "parse error at %s:%d near:\n %s...", \ + @__FILE__, @__LINE__, @scanner.peek(32) + end + + def [] key + return @scanner[key] + end +end |