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python-uncompyle6/uncompyle6/semantics/customize36.py
rocky d6608712f1 correct fn name on older 3.x cross decompile... 
Also black, lint, and isort some
2023-06-30 20:30:06 -04:00

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# Copyright (c) 2019-2023 by Rocky Bernstein
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""Isolate Python 3.6 version-specific semantic actions here.
"""
from xdis import iscode
from spark_parser.ast import GenericASTTraversalPruningException
from uncompyle6.scanners.tok import Token
from uncompyle6.semantics.helper import flatten_list, escape_string, strip_quotes
from uncompyle6.semantics.consts import (
INDENT_PER_LEVEL,
PRECEDENCE,
TABLE_DIRECT,
TABLE_R,
)
from uncompyle6.util import get_code_name
def escape_format(s):
return s.replace("\r", "\\r").replace("\n", "\\n").replace("'''", '"""')
#######################
# Python 3.6+ Changes #
#######################
def customize_for_version36(self, version):
# fmt: off
PRECEDENCE["call_kw"] = 0
PRECEDENCE["call_kw36"] = 1
PRECEDENCE["call_ex"] = 1
PRECEDENCE["call_ex_kw"] = 1
PRECEDENCE["call_ex_kw2"] = 1
PRECEDENCE["call_ex_kw3"] = 1
PRECEDENCE["call_ex_kw4"] = 1
PRECEDENCE["dict_pack"] = 0 # **{ ... }
PRECEDENCE["formatted_value1"] = 100
TABLE_DIRECT.update(
{
"ann_assign_init_value": (
"%|%c = %p\n",
(-1, "store_annotation"),
(0, "expr", 200),
),
"ann_assign_no_init": ("%|%c\n", (0, "store_annotation")),
"async_for_stmt36": (
"%|async for %c in %c:\n%+%c%-\n\n",
(9, "store"),
(1, "expr"),
# Count from end, since COME_FROM shifts things in the forward direction
(-9, ("for_block", "pass")),
),
"async_forelse_stmt36": (
"%|async for %c in %c:\n%+%c%-%|else:\n%+%c%-\n\n",
(9, "store"),
(1, "expr"),
(-10, "for_block"),
(-2, "else_suite"),
),
"call_ex": ("%c(%p)", (0, "expr"), (1, 100)),
"except_return": ("%|except:\n%+%c%-", 3),
"func_args36": ("%c(**", 0),
# This comes from 3.7. Eventually we will rebase from 3.7
# and then this can go away
"if_exp37": ("%p if %c else %c", (1, "expr", 27), 0, 3),
"ifstmtl": ("%|if %c:\n%+%c%-",
(0, "testexpr"), (1, "_ifstmts_jumpl")),
"list_afor": (
" async for %[1]{%c} in %c%[1]{%c}",
(1, "store"), (0, "get_aiter"), (3, "list_iter"),
),
"try_except36": ("%|try:\n%+%c%-%c\n\n", 1, -2),
"tryfinally36": ("%|try:\n%+%c%-%|finally:\n%+%c%-\n\n", (1, "returns"), 3),
"tryfinally_return_stmt": ("%|try:\n%+%c%-%|finally:\n%+%|return%-\n\n", 1),
"unpack_list": ("*%c", (0, "list")),
"store_annotation": ("%[1]{pattr}: %c", 0),
}
)
TABLE_R.update(
{
"CALL_FUNCTION_EX": ("%c(*%P)", 0, (1, 2, ", ", 100)),
# Not quite right
"CALL_FUNCTION_EX_KW": ("%c(**%C)", 0, (2, 3, ",")),
}
)
# fmt: on
def build_unpack_tuple_with_call(node):
n = node[0]
if n == "expr":
n = n[0]
if n == "tuple":
self.call36_tuple(n)
first = 1
sep = ", *"
elif n == "LOAD_STR":
value = self.format_pos_args(n)
self.f.write(value)
first = 1
sep = ", *"
else:
first = 0
sep = "*"
buwc = node[-1]
assert buwc.kind.startswith("BUILD_TUPLE_UNPACK_WITH_CALL")
for n in node[first:-1]:
self.f.write(sep)
self.preorder(n)
sep = ", *"
pass
self.prune()
return
self.n_build_tuple_unpack_with_call = build_unpack_tuple_with_call
def build_unpack_map_with_call(node):
n = node[0]
if n == "expr":
n = n[0]
if n == "dict":
self.call36_dict(n)
first = 1
sep = ", **"
else:
first = 0
sep = "**"
for n in node[first:-1]:
self.f.write(sep)
self.preorder(n)
sep = ", **"
pass
self.prune()
return
self.n_build_map_unpack_with_call = build_unpack_map_with_call
def n_classdef36(node):
# class definition ('class X(A,B,C):')
cclass = self.currentclass
# Pick out various needed bits of information
# * class_name - the name of the class
# * subclass_info - the parameters to the class e.g.
# class Foo(bar, baz)
# ----------
# * subclass_code - the code for the subclass body
subclass_info = None
if node == "classdefdeco2":
if isinstance(node[1][1].attr, str):
class_name = node[1][1].attr
if self.is_pypy and class_name.find("<locals>") > 0:
class_name = class_name.split(".")[-1]
else:
class_name = node[1][2].attr
build_class = node
else:
build_class = node[0]
if build_class == "build_class_kw":
mkfunc = build_class[1]
assert mkfunc == "mkfunc"
subclass_info = build_class
if hasattr(mkfunc[0], "attr") and iscode(mkfunc[0].attr):
subclass_code = mkfunc[0].attr
else:
assert mkfunc[0] == "load_closure"
subclass_code = mkfunc[1].attr
assert iscode(subclass_code)
if build_class[1][0] == "load_closure":
code_node = build_class[1][1]
else:
code_node = build_class[1][0]
class_name = get_code_name(code_node.attr)
assert "mkfunc" == build_class[1]
mkfunc = build_class[1]
if mkfunc[0] in ("kwargs", "no_kwargs"):
for n in mkfunc:
if hasattr(n, "attr") and iscode(n.attr):
subclass_code = n.attr
break
pass
if node == "classdefdeco2":
subclass_info = node
else:
subclass_info = node[0]
elif build_class[1][0] == "load_closure":
# Python 3 with closures not functions
load_closure = build_class[1]
subclass_code = None
for i in range(-4, -1):
if load_closure[i] == "LOAD_CODE":
subclass_code = load_closure[i].attr
break
if subclass_code is None:
raise RuntimeError(
"Internal Error n_classdef: cannot find " "class body"
)
if hasattr(build_class[3], "__len__"):
if not subclass_info:
subclass_info = build_class[3]
elif hasattr(build_class[2], "__len__"):
subclass_info = build_class[2]
else:
raise RuntimeError(
"Internal Error n_classdef: cannot " "superclass name"
)
elif node == "classdefdeco2":
subclass_info = node
subclass_code = build_class[1][0].attr
elif not subclass_info:
if mkfunc[0] in ("no_kwargs", "kwargs"):
subclass_code = mkfunc[1].attr
else:
subclass_code = mkfunc[0].attr
if node == "classdefdeco2":
subclass_info = node
else:
subclass_info = node[0]
if node == "classdefdeco2":
self.write("\n")
else:
self.write("\n\n")
self.currentclass = str(class_name)
self.write(self.indent, "class ", self.currentclass)
self.print_super_classes3(subclass_info)
self.println(":")
# class body
self.indent_more()
self.build_class(subclass_code)
self.indent_less()
self.currentclass = cclass
if len(self.param_stack) > 1:
self.write("\n\n")
else:
self.write("\n\n\n")
self.prune()
self.n_classdef36 = n_classdef36
def call_ex_kw(node):
"""Handle CALL_FUNCTION_EX 1 (have KW) but with
BUILD_MAP_UNPACK_WITH_CALL"""
expr = node[1]
assert expr == "expr"
value = self.format_pos_args(expr)
if value == "":
fmt = "%c(%p)"
else:
fmt = "%%c(%s, %%p)" % value
self.template_engine(
(fmt, (0, "expr"), (2, "build_map_unpack_with_call", 100)), node
)
self.prune()
self.n_call_ex_kw = call_ex_kw
def call_ex_kw2(node):
"""Handle CALL_FUNCTION_EX 2 (have KW) but with
BUILD_{MAP,TUPLE}_UNPACK_WITH_CALL"""
assert node[1] == "build_tuple_unpack_with_call"
value = self.format_pos_args(node[1])
if value == "":
fmt = "%c(%p)"
else:
fmt = "%%c(%s, %%p)" % value
self.template_engine(
(fmt, (0, "expr"), (2, "build_map_unpack_with_call", 100)), node
)
self.prune()
self.n_call_ex_kw2 = call_ex_kw2
def call_ex_kw3(node):
"""Handle CALL_FUNCTION_EX 1 (have KW) but without
BUILD_MAP_UNPACK_WITH_CALL"""
self.preorder(node[0])
self.write("(")
value = self.format_pos_args(node[1][0])
if value == "":
pass
else:
self.write(value)
self.write(", ")
self.write("*")
self.preorder(node[1][1])
self.write(", ")
kwargs = node[2]
if kwargs == "expr" and kwargs[0] != "dict":
kwargs = kwargs[0]
if kwargs == "dict":
self.call36_dict(kwargs)
else:
self.write("**")
self.preorder(kwargs)
self.write(")")
self.prune()
self.n_call_ex_kw3 = call_ex_kw3
def call_ex_kw4(node):
"""Handle CALL_FUNCTION_EX {1 or 2} but without
BUILD_{MAP,TUPLE}_UNPACK_WITH_CALL"""
self.preorder(node[0])
self.write("(")
args = node[1][0]
if args == "tuple":
if self.call36_tuple(args) > 0:
self.write(", ")
pass
pass
else:
self.write("*")
self.preorder(args)
self.write(", ")
pass
kwargs = node[2]
if kwargs == "expr":
kwargs = kwargs[0]
call_function_ex = node[-1]
assert call_function_ex == "CALL_FUNCTION_EX_KW" or (
self.version >= (3, 6) and call_function_ex == "CALL_FUNCTION_EX"
)
# FIXME: decide if the below test be on kwargs == 'dict'
if (
call_function_ex.attr & 1
and (not isinstance(kwargs, Token) and kwargs != "attribute")
and kwargs != "call_kw36"
and not kwargs[0].kind.startswith("kvlist")
):
self.call36_dict(kwargs)
else:
self.write("**")
self.preorder(kwargs)
self.write(")")
self.prune()
self.n_call_ex_kw4 = call_ex_kw4
def format_pos_args(node):
"""
Positional args should format to:
(*(2, ), ...) -> (2, ...)
We remove starting and trailing parenthesis and ', ' if
tuple has only one element.
"""
value = self.traverse(node, indent="")
if value.startswith("("):
assert value.endswith(")")
value = value[1:-1].rstrip(
" "
) # Remove starting '(' and trailing ')' and additional spaces
if value == "":
pass # args is empty
else:
if value.endswith(","): # if args has only one item
value = value[:-1]
return value
self.format_pos_args = format_pos_args
def call36_tuple(node):
"""
A tuple used in a call; these are like normal tuples, but they
don't have the enclosing parenthesis.
"""
assert node == "tuple"
# Note: don't iterate over last element which is a
# BUILD_TUPLE...
flat_elems = flatten_list(node[:-1])
self.indent_more(INDENT_PER_LEVEL)
sep = ""
for elem in flat_elems:
if elem in ("ROT_THREE", "EXTENDED_ARG"):
continue
assert elem == "expr"
line_number = self.line_number
value = self.traverse(elem)
if line_number != self.line_number:
sep += "\n" + self.indent + INDENT_PER_LEVEL[:-1]
self.write(sep, value)
sep = ", "
self.indent_less(INDENT_PER_LEVEL)
return len(flat_elems)
self.call36_tuple = call36_tuple
def call36_dict(node):
"""
A dict used in a call_ex_kw2, which are a dictionary items expressed
in a call. This should format to:
a=1, b=2
In other words, no braces, no quotes around keys and ":" becomes
"=".
We will source-code use line breaks to guide us when to break.
"""
p = self.prec
self.prec = 100
self.indent_more(INDENT_PER_LEVEL)
sep = INDENT_PER_LEVEL[:-1]
line_number = self.line_number
if node[0].kind.startswith("kvlist"):
# Python 3.5+ style key/value list in dict
kv_node = node[0]
l = list(kv_node)
i = 0
length = len(l)
# FIXME: Parser-speed improved grammars will have BUILD_MAP
# at the end. So in the future when everything is
# complete, we can do an "assert" instead of "if".
if kv_node[-1].kind.startswith("BUILD_MAP"):
length -= 1
# Respect line breaks from source
while i < length:
self.write(sep)
name = self.traverse(l[i], indent="")
# Strip off beginning and trailing quotes in name
name = name[1:-1]
if i > 0:
line_number = self.indent_if_source_nl(
line_number, self.indent + INDENT_PER_LEVEL[:-1]
)
line_number = self.line_number
self.write(name, "=")
value = self.traverse(
l[i + 1], indent=self.indent + (len(name) + 2) * " "
)
self.write(value)
sep = ", "
if line_number != self.line_number:
sep += "\n" + self.indent + INDENT_PER_LEVEL[:-1]
line_number = self.line_number
i += 2
pass
elif node[-1].kind.startswith("BUILD_CONST_KEY_MAP"):
keys_node = node[-2]
keys = keys_node.attr
# from trepan.api import debug; debug()
assert keys_node == "LOAD_CONST" and isinstance(keys, tuple)
for i in range(node[-1].attr):
self.write(sep)
self.write(keys[i], "=")
value = self.traverse(node[i], indent="")
self.write(value)
sep = ", "
if line_number != self.line_number:
sep += "\n" + self.indent + INDENT_PER_LEVEL[:-1]
line_number = self.line_number
pass
pass
else:
self.write("**")
try:
self.default(node)
except GenericASTTraversalPruningException:
pass
self.prec = p
self.indent_less(INDENT_PER_LEVEL)
return
self.call36_dict = call36_dict
def n_call_kw36(node):
self.template_engine(("%p(", (0, 100)), node)
keys = node[-2].attr
num_kwargs = len(keys)
num_posargs = len(node) - (num_kwargs + 2)
n = len(node)
assert n >= len(keys) + 1, "not enough parameters keyword-tuple values"
sep = ""
line_number = self.line_number
for i in range(1, num_posargs):
self.write(sep)
self.preorder(node[i])
if line_number != self.line_number:
sep = ",\n" + self.indent + " "
else:
sep = ", "
line_number = self.line_number
i = num_posargs
j = 0
# FIXME: adjust output for line breaks?
while i < n - 2:
self.write(sep)
self.write(keys[j] + "=")
self.preorder(node[i])
if line_number != self.line_number:
sep = ",\n" + self.indent + " "
else:
sep = ", "
i += 1
j += 1
self.write(")")
self.prune()
return
self.n_call_kw36 = n_call_kw36
FSTRING_CONVERSION_MAP = {1: "!s", 2: "!r", 3: "!a", "X": ":X"}
def n_except_suite_finalize(node):
if node[1] == "returns" and self.hide_internal:
# Process node[1] only.
# The code after "returns", e.g. node[3], is dead code.
# Adding it is wrong as it dedents and another
# exception handler "except_stmt" afterwards.
# Note it is also possible that the grammar is wrong here.
# and this should not be "except_stmt".
self.indent_more()
self.preorder(node[1])
self.indent_less()
else:
self.default(node)
self.prune()
self.n_except_suite_finalize = n_except_suite_finalize
def n_formatted_value(node):
if node[0] in ("LOAD_STR", "LOAD_CONST"):
value = node[0].attr
if isinstance(value, tuple):
self.write(node[0].attr)
else:
self.write(escape_string(node[0].attr))
self.prune()
else:
self.default(node)
self.n_formatted_value = n_formatted_value
def n_formatted_value_attr(node):
f_conversion(node)
fmt_node = node.data[3]
if fmt_node == "expr" and fmt_node[0] == "LOAD_STR":
node.string = escape_format(fmt_node[0].attr)
else:
node.string = fmt_node
self.default(node)
self.n_formatted_value_attr = n_formatted_value_attr
def f_conversion(node):
fmt_node = node.data[1]
if fmt_node == "expr" and fmt_node[0] == "LOAD_STR":
data = fmt_node[0].attr
else:
data = fmt_node.attr
node.conversion = FSTRING_CONVERSION_MAP.get(data, "")
return node.conversion
def n_formatted_value1(node):
expr = node[0]
assert expr == "expr"
conversion = f_conversion(node)
if self.in_format_string and self.in_format_string != "formatted_value1":
value = self.traverse(expr, indent="")
if value[0] == "{":
# If we have a set or dictionary comprehension, then we need to add a space
# so as not to confuse the format string with {{.
fmt = "{ %s%s }"
else:
fmt = "{%s%s}"
es = escape_string(fmt % (value, conversion))
f_str = "%s" % es
else:
old_in_format_string = self.in_format_string
self.in_format_string = "formatted_value1"
value = self.traverse(expr, indent="")
self.in_format_string = old_in_format_string
es = escape_string("{%s%s}" % (value, conversion))
f_str = "f%s" % es
self.write(f_str)
self.prune()
self.n_formatted_value1 = n_formatted_value1
def n_formatted_value2(node):
p = self.prec
self.prec = 100
expr = node[0]
assert expr == "expr"
old_in_format_string = self.in_format_string
self.in_format_string = "formatted_value2"
value = self.traverse(expr, indent="")
format_value_attr = node[-1]
assert format_value_attr == "FORMAT_VALUE_ATTR"
attr = format_value_attr.attr
if attr & 4:
assert node[1] == "expr"
fmt = strip_quotes(self.traverse(node[1], indent=""))
attr_flags = attr & 3
if attr_flags:
conversion = "%s:%s" % (FSTRING_CONVERSION_MAP.get(attr_flags, ""), fmt)
else:
conversion = ":%s" % fmt
else:
conversion = FSTRING_CONVERSION_MAP.get(attr, "")
self.in_format_string = old_in_format_string
f_str = "f%s" % escape_string("{%s%s}" % (value, conversion))
self.write(f_str)
self.prec = p
self.prune()
self.n_formatted_value2 = n_formatted_value2
def n_joined_str(node):
p = self.prec
self.prec = 100
old_in_format_string = self.in_format_string
self.in_format_string = "joined_str"
result = ""
for expr in node[:-1]:
assert expr == "expr"
value = self.traverse(expr, indent="")
if expr[0].kind.startswith("formatted_value"):
# remove leading 'f'
if value.startswith("f"):
value = value[1:]
pass
else:
# {{ and }} in Python source-code format strings mean
# { and } respectively. But only when *not* part of a
# formatted value. However, in the LOAD_STR
# bytecode, the escaping of the braces has been
# removed. So we need to put back the braces escaping in
# reconstructing the source.
assert (
expr[0] == "LOAD_STR"
or expr[0] == "LOAD_CONST"
and isinstance(expr[0].attr, unicode)
)
value = value.replace("{", "{{").replace("}", "}}")
# Remove leading quotes
result += strip_quotes(value)
pass
self.in_format_string = old_in_format_string
if self.in_format_string:
self.write(result)
else:
self.write("f%s" % escape_string(result))
self.prec = p
self.prune()
self.n_joined_str = n_joined_str
def n_list_comp_async(node):
self.write("[")
if node[0].kind == "load_closure":
self.listcomp_closure3(node)
else:
self.comprehension_walk_newer(node, iter_index=3, code_index=0)
self.write("]")
self.prune()
self.n_list_comp_async = n_list_comp_async
# def kwargs_only_36(node):
# keys = node[-1].attr
# num_kwargs = len(keys)
# values = node[:num_kwargs]
# for i, (key, value) in enumerate(zip(keys, values)):
# self.write(key + '=')
# self.preorder(value)
# if i < num_kwargs:
# self.write(',')
# self.prune()
# return
# self.n_kwargs_only_36 = kwargs_only_36
def starred(node):
l = len(node)
assert l > 0
pos_args = node[0]
if pos_args == "expr":
pos_args = pos_args[0]
if pos_args == "tuple":
build_tuple = pos_args[0]
if build_tuple.kind.startswith("BUILD_TUPLE"):
tuple_len = 0
else:
tuple_len = len(node) - 1
star_start = 1
template = "%C", (0, -1, ", ")
self.template_engine(template, pos_args)
if tuple_len == 0:
self.write("*()")
# That's it
self.prune()
self.write(", ")
else:
star_start = 0
if l > 1:
template = ("*%C", (star_start, -1, ", *"))
else:
template = ("*%c", (star_start, "expr"))
self.template_engine(template, node)
self.prune()
self.n_starred = starred
def return_closure(node):
# Nothing should be output here
self.prune()
return
self.n_return_closure = return_closure
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