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https://github.com/rocky/python-uncompyle6.git
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96 lines
3.5 KiB
Python
96 lines
3.5 KiB
Python
# Copyright (c) 2016-2018, 2020 Rocky Bernstein
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# Copyright (c) 2000-2002 by hartmut Goebel <hartmut@goebel.noris.de>
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# Copyright (c) 1999 John Aycock
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from spark_parser import DEFAULT_DEBUG as PARSER_DEFAULT_DEBUG
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from uncompyle6.parser import PythonParserSingle
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from uncompyle6.parsers.parse24 import Python24Parser
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class Python23Parser(Python24Parser):
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def __init__(self, debug_parser=PARSER_DEFAULT_DEBUG):
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super(Python23Parser, self).__init__(debug_parser)
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self.customized = {}
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def p_misc23(self, args):
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'''
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# Python 2.4 only adds something like the below for if 1:
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# However we will just treat it as a noop (which of course messes up
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# simple verify of bytecode.
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# See also below in reduce_is_invalid where we check that the JUMP_FORWARD
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# target matches the COME_FROM target
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stmt ::= if1_stmt
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if1_stmt ::= JUMP_FORWARD JUMP_IF_FALSE THEN POP_TOP COME_FROM
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stmts
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JUMP_FORWARD COME_FROM POP_TOP COME_FROM
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# Used to keep semantic positions the same across later versions
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# of Python
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_while1test ::= SETUP_LOOP JUMP_FORWARD JUMP_IF_FALSE POP_TOP COME_FROM
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while1stmt ::= _while1test l_stmts_opt JUMP_BACK
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POP_TOP POP_BLOCK COME_FROM
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while1stmt ::= _while1test l_stmts_opt JUMP_BACK COME_FROM
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POP_TOP POP_BLOCK COME_FROM
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# Python 2.3
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# The following has no "JUMP_BACK" after l_stmts because
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# l_stmts ends in a "break", "return", or "continue"
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while1stmt ::= _while1test l_stmts
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POP_TOP POP_BLOCK
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# The following has a "COME_FROM" at the end which comes from
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# a "break" inside "l_stmts".
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while1stmt ::= _while1test l_stmts COME_FROM JUMP_BACK
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POP_TOP POP_BLOCK COME_FROM
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while1stmt ::= _while1test l_stmts JUMP_BACK
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POP_TOP POP_BLOCK
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list_comp ::= BUILD_LIST_0 DUP_TOP LOAD_ATTR store list_iter delete
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list_for ::= expr for_iter store list_iter JUMP_BACK come_froms POP_TOP JUMP_BACK
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lc_body ::= LOAD_NAME expr CALL_FUNCTION_1 POP_TOP
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lc_body ::= LOAD_FAST expr CALL_FUNCTION_1 POP_TOP
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lc_body ::= LOAD_NAME expr LIST_APPEND
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lc_body ::= LOAD_FAST expr LIST_APPEND
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# "and" where the first part of the and is true,
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# so there is only the 2nd part to evaluate
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expr ::= and2
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and2 ::= _jump jmp_false COME_FROM expr COME_FROM
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alias ::= IMPORT_NAME attributes store
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if_exp ::= expr jmp_false expr JUMP_FORWARD expr COME_FROM
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'''
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def customize_grammar_rules(self, tokens, customize):
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super(Python23Parser, self).customize_grammar_rules(tokens, customize)
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def reduce_is_invalid(self, rule, ast, tokens, first, last):
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invalid = super(Python24Parser,
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self).reduce_is_invalid(rule, ast,
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tokens, first, last)
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if invalid:
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return invalid
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# FiXME: this code never gets called...
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lhs = rule[0]
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if lhs == 'nop_stmt':
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return not int(tokens[first].pattr) == tokens[last].offset
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return False
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class Python23ParserSingle(Python23Parser, PythonParserSingle):
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pass
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if __name__ == '__main__':
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# Check grammar
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p = Python23Parser()
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p.check_grammar()
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p.dump_grammar()
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# local variables:
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# tab-width: 4
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