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41343c27b7
parse2.py: restore accidently-removed while1stmt rule scanner27.py: grammar typo check_ast: add while1else to list of looping constructs pysource.py: CALL_FUNCTION_VAR_KW_ARGS with positional args rule is different?
27 lines
1.1 KiB
Python
27 lines
1.1 KiB
Python
"""
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Python AST grammar checker.
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Our rules sometimes give erroneous results. Until we have perfect rules,
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This checker will catch mistakes in decompilation we've made.
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FIXME idea: extend parsing system to do same kinds of checks or nonterminal
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before reduction and don't reduce when there is a problem.
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"""
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def checker(ast, in_loop, errors):
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in_loop = in_loop or ast.type in ('while1stmt', 'whileTruestmt',
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'whilestmt', 'whileelsestmt', 'while1elsestmt',
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'for_block')
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if ast.type in ('augassign1', 'augassign2') and ast[0][0] == 'and':
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text = str(ast)
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error_text = '\n# improper augmented assigment (e.g. +=, *=, ...):\n#\t' + '\n# '.join(text.split("\n")) + '\n'
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errors.append(error_text)
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for node in ast:
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if not in_loop and node.type in ('continue_stmt', 'break_stmt'):
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text = str(node)
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error_text = '\n# not in loop:\n#\t' + '\n# '.join(text.split("\n"))
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errors.append(error_text)
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if hasattr(node, '__repr1__'):
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checker(node, in_loop, errors)
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