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@ -24,10 +24,13 @@ class ParseException(Exception): |
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self.colno = colno |
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self.colno = colno |
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class Token: |
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class Token: |
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def __init__(self, id, lineno, colno): |
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def __init__(self, tid, lineno, colno): |
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self.id = id |
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self.tid = tid |
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self.lineno = lineno |
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self.lineno = lineno |
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self.colno = colno |
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self.colno = colno |
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def __eq__(self, other): |
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return self.tid == other.tid |
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class Lexer: |
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class Lexer: |
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def __init__(self): |
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def __init__(self): |
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@ -96,11 +99,60 @@ class Lexer: |
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if not matched: |
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if not matched: |
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raise ParseException(lineno, col) |
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raise ParseException(lineno, col) |
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class Parser: |
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def __init__(self, code): |
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self.stream = Lexer().lex(code) |
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self.getsym() |
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def getsym(self): |
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self.current = next(self.stream) |
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def accept(self, s): |
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if self.current.tid == s: |
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self.getsym() |
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return True |
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return False |
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def expect(self, s): |
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if self.accept(s): |
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return True |
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raise ParseException('Unknown token', s.lineno, s.colno) |
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def parse(self): |
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self.codeblock() |
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def statement(self): |
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if self.accept('('): |
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self.statement() |
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self.expect(')') |
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def line(self): |
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if self.accept('if'): |
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self.statement() |
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self.ifelseblock() |
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self.elseblock() |
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self.expect('endif') |
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if self.token == 'eol': |
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return |
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self.statement() |
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def codeblock(self): |
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if self.accept('eol'): |
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return self.codeblock() |
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cond = True |
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while cond: |
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self.line() |
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cond = self.expect('eol') |
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if __name__ == '__main__': |
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if __name__ == '__main__': |
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code = open(sys.argv[1]).read() |
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code = open(sys.argv[1]).read() |
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lex = Lexer() |
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# lex = Lexer() |
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try: |
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# try: |
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for i in lex.lex(code): |
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# for i in lex.lex(code): |
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print('Token:', i.id, 'Line:', i.lineno, 'Column:', i.colno) |
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# print('Token:', i.tid, 'Line:', i.lineno, 'Column:', i.colno) |
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except ParseException as e: |
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# except ParseException as e: |
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print('Error line', e.lineno, 'column', e.colno) |
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# print('Error line', e.lineno, 'column', e.colno) |
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parser = Parser(code) |
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parser.parse() |
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