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#! /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
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