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# -*- Mode: Python -*-
# Copyright (C) 2010 Red Hat, Inc.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
#
from . import ast
from . import message
from .annotationparser import TAG_RETURNS
class IntrospectablePass(object):
def __init__(self, transformer, blocks):
self._transformer = transformer
self._namespace = transformer.namespace
self._blocks = blocks
# Public API
def validate(self):
self._namespace.walk(self._introspectable_alias_analysis)
self._namespace.walk(self._propagate_callable_skips)
self._namespace.walk(self._analyze_node)
self._namespace.walk(self._introspectable_callable_analysis)
self._namespace.walk(self._introspectable_callable_analysis)
self._namespace.walk(self._introspectable_pass3)
def _parameter_warning(self, parent, param, text, position=None):
# Suppress VFunctions and Callbacks warnings for now
# they cause more problems then they are worth
if isinstance(parent, (ast.VFunction, ast.Callback)):
return
block = None
if hasattr(parent, 'symbol'):
prefix = '%s: ' % (parent.symbol, )
block = self._blocks.get(parent.symbol)
if block:
position = block.position
else:
prefix = ''
if isinstance(param, ast.Parameter):
context = "argument %s: " % (param.argname, )
else:
context = "return value: "
if block:
return_tag = block.get(TAG_RETURNS)
if return_tag:
position = return_tag.position
message.warn_node(parent, prefix + context + text,
positions=position)
def _introspectable_param_analysis(self, parent, node):
is_return = isinstance(node, ast.Return)
is_parameter = isinstance(node, ast.Parameter)
assert is_return or is_parameter
if node.type.target_giname is not None:
target = self._transformer.lookup_typenode(node.type)
else:
target = None
if not node.type.resolved:
self._parameter_warning(parent, node,
"Unresolved type: %r" % (node.type.unresolved_string, ))
parent.introspectable = False
return
if isinstance(node.type, ast.Varargs):
parent.introspectable = False
return
if not isinstance(node.type, ast.List) and \
(node.type.target_giname == 'GLib.List'):
self._parameter_warning(parent, node, "Missing (element-type) annotation")
parent.introspectable = False
return
if (is_parameter
and isinstance(target, ast.Callback)
and not node.type.target_giname in ('GLib.DestroyNotify',
'Gio.AsyncReadyCallback')
and node.scope is None):
self._parameter_warning(parent, node,
("Missing (scope) annotation for callback" +
" without GDestroyNotify (valid: %s, %s)")
% (ast.PARAM_SCOPE_CALL, ast.PARAM_SCOPE_ASYNC))
parent.introspectable = False
return
if is_return and isinstance(target, ast.Callback):
self._parameter_warning(parent, node, "Callbacks cannot be return values; use (skip)")
parent.introspectable = False
return
if (is_return
and isinstance(target, (ast.Record, ast.Union))
and target.get_type is None
and not target.foreign):
if node.transfer != ast.PARAM_TRANSFER_NONE:
self._parameter_warning(parent, node,
"Invalid non-constant return of bare structure or union; register as boxed type or (skip)")
parent.introspectable = False
return
if node.transfer is None:
self._parameter_warning(parent, node, "Missing (transfer) annotation")
parent.introspectable = False
return
def _type_is_introspectable(self, typeval, warn=False):
if not typeval.resolved:
return False
if isinstance(typeval, ast.TypeUnknown):
return False
if isinstance(typeval, (ast.Array, ast.List)):
return self._type_is_introspectable(typeval.element_type)
elif isinstance(typeval, ast.Map):
return (self._type_is_introspectable(typeval.key_type)
and self._type_is_introspectable(typeval.value_type))
if typeval.target_foreign:
return True
if typeval.target_fundamental:
if typeval.is_equiv(ast.TYPE_VALIST):
return False
# These are not introspectable pending us adding
# larger type tags to the typelib (in theory these could
# be 128 bit or larger)
if typeval.is_equiv((ast.TYPE_LONG_LONG, ast.TYPE_LONG_ULONG,
ast.TYPE_LONG_DOUBLE)):
return False
return True
target = self._transformer.lookup_typenode(typeval)
if not target:
return False
return target.introspectable and (not target.skip)
def _propagate_parameter_skip(self, parent, node):
if node.type.target_giname is not None:
target = self._transformer.lookup_typenode(node.type)
if target is None:
return
else:
return
if target.skip:
parent.skip = True
def _introspectable_alias_analysis(self, obj, stack):
if isinstance(obj, ast.Alias):
if not self._type_is_introspectable(obj.target):
obj.introspectable = False
return True
def _propagate_callable_skips(self, obj, stack):
if isinstance(obj, ast.Callable):
for param in obj.parameters:
self._propagate_parameter_skip(obj, param)
self._propagate_parameter_skip(obj, obj.retval)
return True
def _analyze_node(self, obj, stack):
if obj.skip:
return False
# Our first pass for scriptability
if isinstance(obj, ast.Callable):
for param in obj.parameters:
self._introspectable_param_analysis(obj, param)
self._introspectable_param_analysis(obj, obj.retval)
if isinstance(obj, (ast.Class, ast.Interface, ast.Record, ast.Union)):
for field in obj.fields:
if field.type:
if not self._type_is_introspectable(field.type):
field.introspectable = False
return True
def _introspectable_callable_analysis(self, obj, stack):
if obj.skip:
return False
# Propagate introspectability of parameters to entire functions
if isinstance(obj, ast.Callable):
for param in obj.parameters:
if not self._type_is_introspectable(param.type):
obj.introspectable = False
return True
if not self._type_is_introspectable(obj.retval.type):
obj.introspectable = False
return True
return True
def _introspectable_pass3(self, obj, stack):
if obj.skip:
return False
# Propagate introspectability for fields
if isinstance(obj, (ast.Class, ast.Interface, ast.Record, ast.Union)):
for field in obj.fields:
if field.anonymous_node:
if not field.anonymous_node.introspectable:
field.introspectable = False
else:
if not self._type_is_introspectable(field.type):
field.introspectable = False
# Propagate introspectability for properties
if isinstance(obj, (ast.Class, ast.Interface)):
for prop in obj.properties:
if not self._type_is_introspectable(prop.type):
prop.introspectable = False
for sig in obj.signals:
self._introspectable_callable_analysis(sig, [obj])
return True
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