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check_ast.py
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29 lines (25 loc) · 1.18 KB
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"""
Python parse tree checker.
Our rules sometimes give erroneous results. Until we have perfect rules,
This checker will catch mistakes in decompilation we've made.
FIXME idea: extend parsing system to do same kinds of checks or nonterminal
before reduction and don't reduce when there is a problem.
"""
def checker(ast, in_loop, errors):
if ast is None:
return
in_loop = (in_loop or (ast.kind in ('while1stmt', 'whileTruestmt',
'whilestmt', 'whileelsestmt', 'while1elsestmt',
'for_block'))
or ast.kind.startswith('async_for'))
if ast.kind in ('aug_assign1', 'aug_assign2') and ast[0][0] == 'and':
text = str(ast)
error_text = '\n# improper augmented assigment (e.g. +=, *=, ...):\n#\t' + '\n# '.join(text.split("\n")) + '\n'
errors.append(error_text)
for node in ast:
if not in_loop and node.kind in ('continue', 'break'):
text = str(node)
error_text = '\n# not in loop:\n#\t' + '\n# '.join(text.split("\n"))
errors.append(error_text)
if hasattr(node, '__repr1__'):
checker(node, in_loop, errors)