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9f250b49eeff4cb13b571a513950b4024309f6a4
python-uncompyle6/uncompyle6/parsers/parse30.py
rocky 9f250b49ee Cope more JUMP/POP_IF not being in 3.0... 
more is probably needed though.
2019-11-11 19:58:35 -05:00

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# Copyright (c) 2016-2017 Rocky Bernstein
"""
spark grammar differences over Python 3.1 for Python 3.0.
"""
from __future__ import print_function
from uncompyle6.parser import PythonParserSingle
from uncompyle6.parsers.parse31 import Python31Parser
class Python30Parser(Python31Parser):
def p_30(self, args):
"""
assert ::= assert_expr jmp_true LOAD_ASSERT RAISE_VARARGS_1 COME_FROM POP_TOP
return_if_lambda ::= RETURN_END_IF_LAMBDA COME_FROM POP_TOP
compare_chained2 ::= expr COMPARE_OP RETURN_END_IF_LAMBDA
# FIXME: combine with parse3.2
whileTruestmt ::= SETUP_LOOP l_stmts_opt JUMP_BACK
COME_FROM_LOOP
whileTruestmt ::= SETUP_LOOP returns
COME_FROM_LOOP
# In many ways Python 3.0 code generation is more like Python 2.6 than
# it is 2.7 or 3.1. So we have a number of 2.6ish (and before) rules below
# Specifically POP_TOP is more prevelant since there is no POP_JUMP_IF_...
# instructions
_ifstmts_jump ::= c_stmts JUMP_FORWARD _come_froms POP_TOP COME_FROM
_ifstmts_jump ::= c_stmts COME_FROM POP_TOP
# Used to keep index order the same in semantic actions
jb_pop_top ::= JUMP_BACK _come_froms POP_TOP
while1stmt ::= SETUP_LOOP l_stmts COME_FROM_LOOP
whileelsestmt ::= SETUP_LOOP testexpr l_stmts
jb_pop_top POP_BLOCK
else_suitel COME_FROM_LOOP
# while1elsestmt ::= SETUP_LOOP l_stmts
# jb_pop_top POP_BLOCK
# else_suitel COME_FROM_LOOP
else_suitel ::= l_stmts COME_FROM_LOOP JUMP_BACK
ifelsestmtl ::= testexpr c_stmts_opt jb_pop_top else_suitel
iflaststmtl ::= testexpr c_stmts_opt jb_pop_top
iflaststmt ::= testexpr c_stmts_opt JUMP_ABSOLUTE COME_FROM POP_TOP
jf_cf_pop ::= JUMP_FORWARD come_froms POP_TOP
ifelsestmt ::= testexpr c_stmts_opt jf_cf_pop else_suite COME_FROM
withasstmt ::= expr setupwithas store suite_stmts_opt
POP_BLOCK LOAD_CONST COME_FROM_FINALLY
LOAD_FAST DELETE_FAST WITH_CLEANUP END_FINALLY
setupwithas ::= DUP_TOP LOAD_ATTR STORE_FAST LOAD_ATTR CALL_FUNCTION_0 setup_finally
setup_finally ::= STORE_FAST SETUP_FINALLY LOAD_FAST DELETE_FAST
# Need to keep LOAD_FAST as index 1
set_comp_func_header ::= BUILD_SET_0 DUP_TOP STORE_FAST
set_comp_func ::= set_comp_func_header
LOAD_FAST FOR_ITER store comp_iter
JUMP_BACK POP_TOP JUMP_BACK RETURN_VALUE RETURN_LAST
list_comp_header ::= BUILD_LIST_0 DUP_TOP STORE_FAST
list_comp ::= list_comp_header
LOAD_FAST FOR_ITER store comp_iter
JUMP_BACK
set_comp_header ::= BUILD_SET_0 DUP_TOP STORE_FAST
set_comp ::= set_comp_header
LOAD_FAST FOR_ITER store comp_iter
JUMP_BACK
dict_comp_header ::= BUILD_MAP_0 DUP_TOP STORE_FAST
dict_comp ::= dict_comp_header
LOAD_FAST FOR_ITER store dict_comp_iter
JUMP_BACK
dict_comp_iter ::= expr expr ROT_TWO expr STORE_SUBSCR
# JUMP_IF_TRUE POP_TOP as a replacement
comp_if ::= expr jmp_false comp_iter
comp_if ::= expr jmp_false comp_iter JUMP_BACK COME_FROM POP_TOP
comp_if_not ::= expr jmp_true comp_iter JUMP_BACK COME_FROM POP_TOP
comp_iter ::= expr expr SET_ADD
comp_iter ::= expr expr LIST_APPEND
jump_forward_else ::= JUMP_FORWARD COME_FROM POP_TOP
jump_absolute_else ::= JUMP_ABSOLUTE COME_FROM POP_TOP
except_suite ::= c_stmts POP_EXCEPT jump_except POP_TOP
except_suite_finalize ::= SETUP_FINALLY c_stmts_opt except_var_finalize END_FINALLY
_jump COME_FROM POP_TOP
_ifstmts_jump ::= c_stmts_opt JUMP_FORWARD COME_FROM POP_TOP
jump_except ::= JUMP_FORWARD COME_FROM POP_TOP
jump_except ::= JUMP_ABSOLUTE COME_FROM POP_TOP
or ::= expr jmp_false expr jmp_true expr
or ::= expr jmp_true expr
################################################################################
# In many ways 3.0 is like 2.6. One similarity is there is no JUMP_IF_TRUE and
# JUMP_IF_FALSE
# The below rules in fact are the same or similar.
jmp_true ::= JUMP_IF_TRUE POP_TOP
jmp_false ::= JUMP_IF_FALSE _come_froms POP_TOP
jmp_false_then ::= JUMP_IF_FALSE POP_TOP
# We don't have hacky THEN detection, so we do it
# in the grammar below which is also somewhat hacky.
stmt ::= ifstmt30
ifstmt30 ::= testexpr_then _ifstmts_jump30
testexpr_then ::= testfalse_then
testfalse_then ::= expr jmp_false_then
call_stmt ::= expr COME_FROM
_ifstmts_jump30 ::= c_stmts POP_TOP
gen_comp_body ::= expr YIELD_VALUE COME_FROM POP_TOP
except_handler ::= jmp_abs COME_FROM_EXCEPT except_stmts
COME_FROM POP_TOP END_FINALLY
expr ::= or30
ret_or ::= or30
or30 ::= expr JUMP_IF_TRUE COME_FROM POP_TOP expr come_from_opt
################################################################################
for_block ::= l_stmts_opt _come_froms POP_TOP JUMP_BACK
except_handler ::= JUMP_FORWARD COME_FROM_EXCEPT except_stmts
POP_TOP END_FINALLY come_froms
except_handler ::= jmp_abs COME_FROM_EXCEPT except_stmts
POP_TOP END_FINALLY
return_if_stmt ::= ret_expr RETURN_END_IF COME_FROM POP_TOP
and ::= expr jmp_false expr come_from_opt
whilestmt ::= SETUP_LOOP testexpr l_stmts_opt come_from_opt
JUMP_BACK come_froms POP_TOP POP_BLOCK COME_FROM_LOOP
whilestmt ::= SETUP_LOOP testexpr returns
POP_TOP POP_BLOCK COME_FROM_LOOP
# compare_chained is like x <= y <= z
compare_chained1 ::= expr DUP_TOP ROT_THREE COMPARE_OP
jmp_false compare_chained1 _come_froms
compare_chained1 ::= expr DUP_TOP ROT_THREE COMPARE_OP
jmp_false compare_chained2 _come_froms
compare_chained2 ::= expr COMPARE_OP RETURN_END_IF
"""
def customize_grammar_rules(self, tokens, customize):
super(Python30Parser, self).customize_grammar_rules(tokens, customize)
self.remove_rules("""
iflaststmtl ::= testexpr c_stmts_opt JUMP_BACK COME_FROM_LOOP
ifelsestmtl ::= testexpr c_stmts_opt JUMP_BACK else_suitel
iflaststmt ::= testexpr c_stmts_opt JUMP_ABSOLUTE
_ifstmts_jump ::= c_stmts_opt JUMP_FORWARD _come_froms
jump_forward_else ::= JUMP_FORWARD ELSE
jump_absolute_else ::= JUMP_ABSOLUTE ELSE
whilestmt ::= SETUP_LOOP testexpr l_stmts_opt COME_FROM JUMP_BACK POP_BLOCK
COME_FROM_LOOP
whilestmt ::= SETUP_LOOP testexpr returns
POP_BLOCK COME_FROM_LOOP
assert ::= assert_expr jmp_true LOAD_ASSERT RAISE_VARARGS_1
return_if_lambda ::= RETURN_END_IF_LAMBDA
except_suite ::= c_stmts POP_EXCEPT jump_except
whileelsestmt ::= SETUP_LOOP testexpr l_stmts JUMP_BACK POP_BLOCK
else_suitel COME_FROM_LOOP
# No JUMP_IF_FALSE_OR_POP, JUMP_IF_TRUE_OR_POP,
# POP_JUMP_IF_FALSE, or POP_JUMP_IF_TRUE
jmp_false ::= POP_JUMP_IF_FALSE
jmp_true ::= JUMP_IF_TRUE_OR_POP POP_TOP
compare_chained1 ::= expr DUP_TOP ROT_THREE COMPARE_OP JUMP_IF_FALSE_OR_POP
compare_chained1 COME_FROM
compare_chained1 ::= expr DUP_TOP ROT_THREE COMPARE_OP JUMP_IF_FALSE_OR_POP
compare_chained2 COME_FROM
ret_or ::= expr JUMP_IF_TRUE_OR_POP ret_expr_or_cond COME_FROM
or ::= expr JUMP_IF_TRUE_OR_POP expr COME_FROM
""")
self.check_reduce["iflaststmtl"] = "AST"
self.check_reduce['ifstmt'] = "AST"
# self.check_reduce["ifelsestmt"] = "AST"
return
def reduce_is_invalid(self, rule, ast, tokens, first, last):
invalid = super(Python30Parser,
self).reduce_is_invalid(rule, ast,
tokens, first, last)
if invalid:
return invalid
if (
rule[0] in ("iflaststmtl", "ifstmt") and ast[0] == "testexpr"
):
testexpr = ast[0]
if testexpr[0] == "testfalse":
testfalse = testexpr[0]
if testfalse[1] == "jmp_false":
jmp_false = testfalse[1]
if last == len(tokens):
last -= 1
while (isinstance(tokens[first].offset, str) and first < last):
first += 1
if first == last:
return True
while (first < last and isinstance(tokens[last].offset, str)):
last -= 1
return not (tokens[first].offset <= jmp_false[0].attr <= tokens[last].offset)
pass
class Python30ParserSingle(Python30Parser, PythonParserSingle):
pass
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