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90 lines
3.2 KiB
Python
90 lines
3.2 KiB
Python
# Copyright (c) 2016 Rocky Bernstein
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"""
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spark grammar differences over Python2.5 for Python 2.4.
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"""
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from uncompyle6.parser import PythonParserSingle
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from spark_parser import DEFAULT_DEBUG as PARSER_DEFAULT_DEBUG
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from uncompyle6.parsers.parse25 import Python25Parser
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class Python24Parser(Python25Parser):
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def __init__(self, debug_parser=PARSER_DEFAULT_DEBUG):
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super(Python24Parser, self).__init__(debug_parser)
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self.customized = {}
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def p_misc24(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 ::= nop_stmt
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nop_stmt ::= JUMP_FORWARD POP_TOP COME_FROM
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# 2.5+ has two LOAD_CONSTs, one for the number '.'s in a relative import
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# keep positions similar to simplify semantic actions
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importstmt ::= filler LOAD_CONST import_as
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importfrom ::= filler LOAD_CONST IMPORT_NAME importlist POP_TOP
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importstar ::= filler LOAD_CONST IMPORT_NAME IMPORT_STAR
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importmultiple ::= filler LOAD_CONST import_as imports_cont
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import_cont ::= filler LOAD_CONST import_as
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# Python 2.5+ omits POP_TOP POP_BLOCK
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while1stmt ::= SETUP_LOOP l_stmts JUMP_BACK POP_TOP POP_BLOCK COME_FROM
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while1stmt ::= SETUP_LOOP l_stmts_opt JUMP_BACK POP_TOP POP_BLOCK COME_FROM
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# Python 2.5+:
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# call_stmt ::= expr POP_TOP
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# expr ::= yield
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call_stmt ::= yield
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# Python 2.5+ adds POP_TOP at the end
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gen_comp_body ::= expr YIELD_VALUE
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# Python 2.4
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# Python 2.6, 2.7 and 3.3+ use kv3
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# Python 2.3- use kv
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kvlist ::= kvlist kv2
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kv2 ::= DUP_TOP expr expr ROT_THREE STORE_SUBSCR
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'''
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def add_custom_rules(self, tokens, customize):
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self.remove_rules("""
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gen_comp_body ::= expr YIELD_VALUE POP_TOP
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kvlist ::= kvlist kv3
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while1stmt ::= SETUP_LOOP l_stmts JUMP_BACK COME_FROM
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while1stmt ::= SETUP_LOOP l_stmts_opt JUMP_BACK COME_FROM
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while1stmt ::= SETUP_LOOP return_stmts COME_FROM
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whilestmt ::= SETUP_LOOP testexpr return_stmts POP_BLOCK COME_FROM
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""")
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super(Python24Parser, self).add_custom_rules(tokens, customize)
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if self.version == 2.4:
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self.check_reduce['nop_stmt'] = 'tokens'
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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 or tokens is None:
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return invalid
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lhs = rule[0]
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if lhs == 'nop_stmt':
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l = len(tokens)
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if 0 <= l < len(tokens):
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return not int(tokens[first].pattr) == tokens[last].offset
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return False
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class Python24ParserSingle(Python24Parser, PythonParserSingle):
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pass
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if __name__ == '__main__':
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# Check grammar
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p = Python24Parser()
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p.check_grammar()
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