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#############################################################################
##
## Copyright (C) 2017 The Qt Company Ltd.
## Contact: https://www.qt.io/licensing/
##
## This file is part of the Qt for Python project.
##
## $QT_BEGIN_LICENSE:LGPL$
## Commercial License Usage
## Licensees holding valid commercial Qt licenses may use this file in
## accordance with the commercial license agreement provided with the
## Software or, alternatively, in accordance with the terms contained in
## a written agreement between you and The Qt Company. For licensing terms
## and conditions see https://www.qt.io/terms-conditions. For further
## information use the contact form at https://www.qt.io/contact-us.
##
## GNU Lesser General Public License Usage
## Alternatively, this file may be used under the terms of the GNU Lesser
## General Public License version 3 as published by the Free Software
## Foundation and appearing in the file LICENSE.LGPL3 included in the
## packaging of this file. Please review the following information to
## ensure the GNU Lesser General Public License version 3 requirements
## will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
##
## GNU General Public License Usage
## Alternatively, this file may be used under the terms of the GNU
## General Public License version 2.0 or (at your option) the GNU General
## Public license version 3 or any later version approved by the KDE Free
## Qt Foundation. The licenses are as published by the Free Software
## Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
## included in the packaging of this file. Please review the following
## information to ensure the GNU General Public License requirements will
## be met: https://www.gnu.org/licenses/gpl-2.0.html and
## https://www.gnu.org/licenses/gpl-3.0.html.
##
## $QT_END_LICENSE$
##
#############################################################################
from __future__ import print_function, absolute_import
import sys
import re
import warnings
import types
import keyword
import functools
from .mapping import type_map, update_mapping, __dict__ as namespace
_DEBUG = False
TYPE_MAP_DOC = """
The type_map variable is central for the signature package.
PySide has a new function 'CppGenerator::writeSignatureInfo()'
that extracts the gathered information about the function arguments
and defaults as good as it can. But what PySide generates is still
very C-ish and has many constants that Python doesn't understand.
The function 'try_to_guess()' below understands a lot of PySide's
peculiar way to assume local context. If it is able to do the guess,
then the result is inserted into the dict, so the search happens
not again. For everything that is not covered by these automatic
guesses, we provide an entry in 'type_map' that resolves it.
In effect, 'type_map' maps text to real Python objects.
"""
def dprint(*args, **kw):
if _DEBUG:
import pprint
for arg in args:
pprint.pprint(arg)
def _parse_line(line):
line_re = r"""
((?P<multi> ([0-9]+)) : )? # the optional multi-index
(?P<funcname> \w+(\.\w+)*) # the function name
\( (?P<arglist> .*?) \) # the argument list
( -> (?P<returntype> .*) )? # the optional return type
$
"""
ret = re.match(line_re, line, re.VERBOSE).groupdict()
arglist = ret["arglist"]
# The following is a split re. The string is broken into pieces which are
# between the recognized strings. Because the re has groups, both the
# strings and the delimiters are returned, where the strings are not
# interesting at all: They are just the commata.
# Note that it is necessary to put the characters with special handling in
# the first group (comma, brace, angle bracket).
# Then they are not recognized there, and we can handle them differently
# in the following expressions.
arglist = list(x.strip() for x in re.split(r"""
(
(?: # inner group is not capturing
[^,()<>] # no commas or braces or angle brackets
|
\(
(?:
[^()]* # or one brace pair
|
\(
[^()]* # or doubls nested pair
\)
)*
\)
|
< # or one angle bracket pair
[^<>]*
>
)+ # longest possible span
) # this list is interspersed with "," and surrounded by ""
""", arglist, flags=re.VERBOSE)
if x.strip() not in ("", ","))
args = []
for arg in arglist:
name, ann = arg.split(":")
if name in keyword.kwlist:
name = name + "_"
if "=" in ann:
ann, default = ann.split("=")
tup = name, ann, default
else:
tup = name, ann
args.append(tup)
ret["arglist"] = args
multi = ret["multi"]
if multi is not None:
ret["multi"] = int(multi)
return ret
def make_good_value(thing, valtype):
try:
if thing.endswith("()"):
thing = 'Default("{}")'.format(thing[:-2])
else:
ret = eval(thing, namespace)
if valtype and repr(ret).startswith("<"):
thing = 'Instance("{}")'.format(thing)
return eval(thing, namespace)
except Exception:
pass
def try_to_guess(thing, valtype):
if "." not in thing and "(" not in thing:
text = "{}.{}".format(valtype, thing)
ret = make_good_value(text, valtype)
if ret is not None:
return ret
typewords = valtype.split(".")
valwords = thing.split(".")
braceless = valwords[0] # Yes, not -1. Relevant is the overlapped word.
if "(" in braceless:
braceless = braceless[:braceless.index("(")]
for idx, w in enumerate(typewords):
if w == braceless:
text = ".".join(typewords[:idx] + valwords)
ret = make_good_value(text, valtype)
if ret is not None:
return ret
return None
def _resolve_value(thing, valtype, line):
if thing in ("0", "None") and valtype:
thing = "zero({})".format(valtype)
if thing in type_map:
return type_map[thing]
res = make_good_value(thing, valtype)
if res is not None:
type_map[thing] = res
return res
res = try_to_guess(thing, valtype) if valtype else None
if res is not None:
type_map[thing] = res
return res
warnings.warn("""pyside_type_init:
UNRECOGNIZED: {!r}
OFFENDING LINE: {!r}
""".format(thing, line), RuntimeWarning)
return thing
def _resolve_type(thing, line):
return _resolve_value(thing, None, line)
def calculate_props(line):
line = line.strip()
res = _parse_line(line)
arglist = res["arglist"]
annotations = {}
_defaults = []
for tup in arglist:
name, ann = tup[:2]
annotations[name] = _resolve_type(ann, line)
if len(tup) == 3:
default = _resolve_value(tup[2], ann, line)
_defaults.append(default)
defaults = tuple(_defaults)
returntype = res["returntype"]
if returntype is not None:
annotations["return"] = _resolve_type(returntype, line)
props = {}
props["defaults"] = defaults
props["kwdefaults"] = {}
props["annotations"] = annotations
props["varnames"] = varnames = tuple(tup[0] for tup in arglist)
funcname = res["funcname"]
props["fullname"] = funcname
shortname = funcname[funcname.rindex(".")+1:]
props["name"] = shortname
props["multi"] = res["multi"]
return props
def pyside_type_init(typemod, sig_str):
dprint()
if type(typemod) is types.ModuleType:
dprint("Initialization of module '{}'".format(typemod.__name__))
else:
dprint("Initialization of type '{}.{}'".format(typemod.__module__,
typemod.__name__))
update_mapping()
ret = {}
multi_props = []
for line in sig_str.strip().splitlines():
props = calculate_props(line)
shortname = props["name"]
multi = props["multi"]
if multi is None:
ret[shortname] = props
dprint(props)
else:
fullname = props.pop("fullname")
multi_props.append(props)
if multi > 0:
continue
multi_props = {"multi": multi_props, "fullname": fullname}
ret[shortname] = multi_props
dprint(multi_props)
multi_props = []
return ret
# end of file
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