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82 lines
3.1 KiB
Python
82 lines
3.1 KiB
Python
# Copyright (c) 2016-2017 Rocky Bernstein
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"""
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spark grammar differences over Python2.6 for Python 2.5.
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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.parse26 import Python26Parser
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class Python25Parser(Python26Parser):
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def __init__(self, debug_parser=PARSER_DEFAULT_DEBUG):
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super(Python25Parser, self).__init__(debug_parser)
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self.customized = {}
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def p_misc25(self, args):
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"""
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# If "return_if_stmt" is in a loop, a JUMP_BACK can be emitted. In 2.6 the
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# JUMP_BACK doesn't appear
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return_if_stmt ::= ret_expr RETURN_END_IF JUMP_BACK
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# Python 2.6 uses ROT_TWO instead of the STORE_xxx
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# withas is allowed as a "from future" in 2.5
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# 2.6 and 2.7 do something slightly different
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setupwithas ::= DUP_TOP LOAD_ATTR store LOAD_ATTR CALL_FUNCTION_0
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setup_finally
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# opcode SETUP_WITH
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setupwith ::= DUP_TOP LOAD_ATTR STORE_NAME LOAD_ATTR CALL_FUNCTION_0 POP_TOP
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withstmt ::= expr setupwith SETUP_FINALLY suite_stmts_opt
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POP_BLOCK LOAD_CONST COME_FROM with_cleanup
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store ::= STORE_FAST
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store ::= STORE_NAME
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tryelsestmt ::= SETUP_EXCEPT suite_stmts_opt POP_BLOCK
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try_middle else_suite COME_FROM
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# Python 2.6 omits the LOAD_FAST DELETE_FAST below
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# withas is allowed as a "from future" in 2.5
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withasstmt ::= expr setupwithas designator suite_stmts_opt
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POP_BLOCK LOAD_CONST COME_FROM
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with_cleanup
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with_cleanup ::= LOAD_FAST DELETE_FAST WITH_CLEANUP END_FINALLY
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with_cleanup ::= LOAD_NAME DELETE_NAME WITH_CLEANUP END_FINALLY
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kvlist ::= kvlist kv
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kv ::= DUP_TOP expr ROT_TWO expr STORE_SUBSCR
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"""
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def add_custom_rules(self, tokens, customize):
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# grammar rules inherited from Python 2.6
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self.remove_rules("""
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setupwith ::= DUP_TOP LOAD_ATTR ROT_TWO LOAD_ATTR CALL_FUNCTION_0 POP_TOP
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withstmt ::= expr setupwith SETUP_FINALLY suite_stmts_opt
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POP_BLOCK LOAD_CONST COME_FROM WITH_CLEANUP END_FINALLY
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withasstmt ::= expr setupwithas designator suite_stmts_opt
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POP_BLOCK LOAD_CONST COME_FROM WITH_CLEANUP END_FINALLY
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assert2 ::= assert_expr jmp_true LOAD_ASSERT expr CALL_FUNCTION_1 RAISE_VARARGS_1
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""")
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super(Python25Parser, self).add_custom_rules(tokens, customize)
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if self.version == 2.5:
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self.check_reduce['tryelsestmt'] = 'tokens'
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def reduce_is_invalid(self, rule, ast, tokens, first, last):
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invalid = super(Python25Parser,
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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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return False
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class Python25ParserSingle(Python26Parser, PythonParserSingle):
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pass
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if __name__ == '__main__':
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# Check grammar
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p = Python25Parser()
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p.check_grammar()
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