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brain_gi.py
# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html # For details: https://github.com/PyCQA/astroid/blob/main/LICENSE # Copyright (c) https://github.com/PyCQA/astroid/blob/main/CONTRIBUTORS.txt """Astroid hooks for the Python 2 GObject introspection bindings. Helps with understanding everything imported from 'gi.repository' """ # pylint:disable=import-error,import-outside-toplevel import inspect import itertools import re import sys import warnings from astroid import nodes from astroid.builder import AstroidBuilder from astroid.exceptions import AstroidBuildingError from astroid.manager import AstroidManager _inspected_modules = {} _identifier_re = r"^[A-Za-z_]\w*$" _special_methods = frozenset( { "__lt__", "__le__", "__eq__", "__ne__", "__ge__", "__gt__", "__iter__", "__getitem__", "__setitem__", "__delitem__", "__len__", "__bool__", "__nonzero__", "__next__", "__str__", "__contains__", "__enter__", "__exit__", "__repr__", "__getattr__", "__setattr__", "__delattr__", "__del__", "__hash__", } ) def _gi_build_stub(parent): # noqa: C901 """ Inspect the passed module recursively and build stubs for functions, classes, etc. """ classes = {} functions = {} constants = {} methods = {} for name in dir(parent): if name.startswith("__") and name not in _special_methods: continue # Check if this is a valid name in python if not re.match(_identifier_re, name): continue try: obj = getattr(parent, name) except Exception: # pylint: disable=broad-except # gi.module.IntrospectionModule.__getattr__() can raise all kinds of things # like ValueError, TypeError, NotImplementedError, RepositoryError, etc continue if inspect.isclass(obj): classes[name] = obj elif inspect.isfunction(obj) or inspect.isbuiltin(obj): functions[name] = obj elif inspect.ismethod(obj) or inspect.ismethoddescriptor(obj): methods[name] = obj elif ( str(obj).startswith("<flags") or str(obj).startswith("<enum ") or str(obj).startswith("<GType ") or inspect.isdatadescriptor(obj) ): constants[name] = 0 elif isinstance(obj, (int, str)): constants[name] = obj elif callable(obj): # Fall back to a function for anything callable functions[name] = obj else: # Assume everything else is some manner of constant constants[name] = 0 ret = "" if constants: ret += f"# {parent.__name__} constants\n\n" for name in sorted(constants): if name[0].isdigit(): # GDK has some busted constant names like # Gdk.EventType.2BUTTON_PRESS continue val = constants[name] strval = str(val) if isinstance(val, str): strval = '"%s"' % str(val).replace("\\", "\\\\") ret += f"{name} = {strval}\n" if ret: ret += "\n\n" if functions: ret += f"# {parent.__name__} functions\n\n" for name in sorted(functions): ret += f"def {name}(*args, **kwargs):\n" ret += " pass\n" if ret: ret += "\n\n" if methods: ret += f"# {parent.__name__} methods\n\n" for name in sorted(methods): ret += f"def {name}(self, *args, **kwargs):\n" ret += " pass\n" if ret: ret += "\n\n" if classes: ret += f"# {parent.__name__} classes\n\n" for name, obj in sorted(classes.items()): base = "object" if issubclass(obj, Exception): base = "Exception" ret += f"class {name}({base}):\n" classret = _gi_build_stub(obj) if not classret: classret = "pass\n" for line in classret.splitlines(): ret += " " + line + "\n" ret += "\n" return ret def _import_gi_module(modname): # we only consider gi.repository submodules if not modname.startswith("gi.repository."): raise AstroidBuildingError(modname=modname) # build astroid representation unless we already tried so if modname not in _inspected_modules: modnames = [modname] optional_modnames = [] # GLib and GObject may have some special case handling # in pygobject that we need to cope with. However at # least as of pygobject3-3.13.91 the _glib module doesn't # exist anymore, so if treat these modules as optional. if modname == "gi.repository.GLib": optional_modnames.append("gi._glib") elif modname == "gi.repository.GObject": optional_modnames.append("gi._gobject") try: modcode = "" for m in itertools.chain(modnames, optional_modnames): try: with warnings.catch_warnings(): # Just inspecting the code can raise gi deprecation # warnings, so ignore them. try: from gi import ( # pylint:disable=import-error PyGIDeprecationWarning, PyGIWarning, ) warnings.simplefilter("ignore", PyGIDeprecationWarning) warnings.simplefilter("ignore", PyGIWarning) except Exception: # pylint:disable=broad-except pass __import__(m) modcode += _gi_build_stub(sys.modules[m]) except ImportError: if m not in optional_modnames: raise except ImportError: astng = _inspected_modules[modname] = None else: astng = AstroidBuilder(AstroidManager()).string_build(modcode, modname) _inspected_modules[modname] = astng else: astng = _inspected_modules[modname] if astng is None: raise AstroidBuildingError(modname=modname) return astng def _looks_like_require_version(node) -> bool: # Return whether this looks like a call to gi.require_version(<name>, <version>) # Only accept function calls with two constant arguments if len(node.args) != 2: return False if not all(isinstance(arg, nodes.Const) for arg in node.args): return False func = node.func if isinstance(func, nodes.Attribute): if func.attrname != "require_version": return False if isinstance(func.expr, nodes.Name) and func.expr.name == "gi": return True return False if isinstance(func, nodes.Name): return func.name == "require_version" return False def _register_require_version(node): # Load the gi.require_version locally try: import gi gi.require_version(node.args[0].value, node.args[1].value) except Exception: # pylint:disable=broad-except pass return node AstroidManager().register_failed_import_hook(_import_gi_module) AstroidManager().register_transform( nodes.Call, _register_require_version, _looks_like_require_version )
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