66 lines
1.1 KiB
Ruby
66 lines
1.1 KiB
Ruby
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module AS; end
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if (not defined? RUBY_ENGINE or not RUBY_ENGINE == 'rbx')
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class Regexp
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def match_start(str, idx)
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Regexp.compile('\A(?:'+source+')').match(str[idx..-1])
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end
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end
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end
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class Asm::Scanner
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def initialize(str)
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@string = str
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@pos = 0
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@line = 0
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@column = 0
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end
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attr_accessor :string, :pos, :line, :column, :prev_line, :prev_column
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def rest
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string[pos..-1]
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end
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def advance_str(str)
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self.prev_line = line
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self.prev_column = column
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self.pos += str.length
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self.line += str.count("\n")
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if (str.include?("\n"))
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self.column = str.length - str.rindex("\n")
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else
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self.column += str.length
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end
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end
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def scan(regexp)
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if (match = regexp.match_start(rest, 0))
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advance_str match.to_s
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match.captures
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else
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nil
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end
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end
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def scan_str(regexp)
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if (match = regexp.match_start(rest, 0))
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advance_str match.to_s
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match.to_s
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else
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nil
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end
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end
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def lookahead(regexp)
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if (match = regexp.match_start(rest, 0))
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true
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else
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false
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end
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end
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def eos?
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pos == string.length
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end
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end
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