mirror of
https://github.com/servo/servo.git
synced 2025-06-06 16:45:39 +00:00
480 lines
19 KiB
Python
480 lines
19 KiB
Python
# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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import os
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from WebIDL import IDLExternalInterface, IDLWrapperType, WebIDLError
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class Configuration:
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"""
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Represents global configuration state based on IDL parse data and
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the configuration file.
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"""
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def __init__(self, filename, parseData):
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# Read the configuration file.
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glbl = {}
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execfile(filename, glbl)
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config = glbl['DOMInterfaces']
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# Build descriptors for all the interfaces we have in the parse data.
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# This allows callers to specify a subset of interfaces by filtering
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# |parseData|.
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self.descriptors = []
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self.interfaces = {}
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self.maxProtoChainLength = 0
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for thing in parseData:
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# Servo does not support external interfaces.
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if isinstance(thing, IDLExternalInterface):
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raise WebIDLError("Servo does not support external interfaces.",
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[thing.location])
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assert not thing.isType()
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if not thing.isInterface() and not thing.isNamespace():
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continue
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iface = thing
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self.interfaces[iface.identifier.name] = iface
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if iface.identifier.name not in config:
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# Completely skip consequential interfaces with no descriptor
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# if they have no interface object because chances are we
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# don't need to do anything interesting with them.
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if iface.isConsequential() and not iface.hasInterfaceObject():
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continue
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entry = {}
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else:
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entry = config[iface.identifier.name]
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if not isinstance(entry, list):
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assert isinstance(entry, dict)
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entry = [entry]
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self.descriptors.extend(
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[Descriptor(self, iface, x) for x in entry])
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# Mark the descriptors for which only a single nativeType implements
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# an interface.
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for descriptor in self.descriptors:
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intefaceName = descriptor.interface.identifier.name
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otherDescriptors = [d for d in self.descriptors
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if d.interface.identifier.name == intefaceName]
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descriptor.uniqueImplementation = len(otherDescriptors) == 1
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self.enums = [e for e in parseData if e.isEnum()]
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self.typedefs = [e for e in parseData if e.isTypedef()]
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self.dictionaries = [d for d in parseData if d.isDictionary()]
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self.callbacks = [c for c in parseData if
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c.isCallback() and not c.isInterface()]
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# Keep the descriptor list sorted for determinism.
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self.descriptors.sort(lambda x, y: cmp(x.name, y.name))
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def getInterface(self, ifname):
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return self.interfaces[ifname]
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def getDescriptors(self, **filters):
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"""Gets the descriptors that match the given filters."""
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curr = self.descriptors
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for key, val in filters.iteritems():
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if key == 'webIDLFile':
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getter = lambda x: x.interface.filename()
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elif key == 'hasInterfaceObject':
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getter = lambda x: x.interface.hasInterfaceObject()
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elif key == 'isCallback':
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getter = lambda x: x.interface.isCallback()
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elif key == 'isNamespace':
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getter = lambda x: x.interface.isNamespace()
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elif key == 'isJSImplemented':
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getter = lambda x: x.interface.isJSImplemented()
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elif key == 'isGlobal':
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getter = lambda x: x.isGlobal()
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elif key == 'isInline':
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getter = lambda x: x.interface.getExtendedAttribute('Inline') is not None
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elif key == 'isExposedConditionally':
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getter = lambda x: x.interface.isExposedConditionally()
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elif key == 'isIteratorInterface':
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getter = lambda x: x.interface.isIteratorInterface()
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else:
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getter = lambda x: getattr(x, key)
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curr = filter(lambda x: getter(x) == val, curr)
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return curr
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def getEnums(self, webIDLFile):
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return filter(lambda e: e.filename() == webIDLFile, self.enums)
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def getTypedefs(self, webIDLFile):
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return filter(lambda e: e.filename() == webIDLFile, self.typedefs)
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@staticmethod
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def _filterForFile(items, webIDLFile=""):
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"""Gets the items that match the given filters."""
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if not webIDLFile:
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return items
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return filter(lambda x: x.filename() == webIDLFile, items)
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def getDictionaries(self, webIDLFile=""):
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return self._filterForFile(self.dictionaries, webIDLFile=webIDLFile)
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def getCallbacks(self, webIDLFile=""):
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return self._filterForFile(self.callbacks, webIDLFile=webIDLFile)
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def getDescriptor(self, interfaceName):
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"""
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Gets the appropriate descriptor for the given interface name.
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"""
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iface = self.getInterface(interfaceName)
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descriptors = self.getDescriptors(interface=iface)
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# We should have exactly one result.
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if len(descriptors) != 1:
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raise NoSuchDescriptorError("For " + interfaceName + " found " +
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str(len(descriptors)) + " matches")
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return descriptors[0]
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def getDescriptorProvider(self):
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"""
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Gets a descriptor provider that can provide descriptors as needed.
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"""
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return DescriptorProvider(self)
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class NoSuchDescriptorError(TypeError):
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def __init__(self, str):
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TypeError.__init__(self, str)
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class DescriptorProvider:
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"""
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A way of getting descriptors for interface names
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"""
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def __init__(self, config):
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self.config = config
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def getDescriptor(self, interfaceName):
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"""
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Gets the appropriate descriptor for the given interface name given the
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context of the current descriptor.
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"""
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return self.config.getDescriptor(interfaceName)
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def MemberIsUnforgeable(member, descriptor):
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return ((member.isAttr() or member.isMethod()) and
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not member.isStatic() and
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(member.isUnforgeable() or
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bool(descriptor.interface.getExtendedAttribute("Unforgeable"))))
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class Descriptor(DescriptorProvider):
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"""
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Represents a single descriptor for an interface. See Bindings.conf.
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"""
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def __init__(self, config, interface, desc):
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DescriptorProvider.__init__(self, config)
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self.interface = interface
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if not self.isExposedConditionally():
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if interface.parent and interface.parent.isExposedConditionally():
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raise TypeError("%s is not conditionally exposed but inherits from "
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"%s which is" %
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(interface.identifier.name, interface.parent.identifier.name))
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# Read the desc, and fill in the relevant defaults.
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ifaceName = self.interface.identifier.name
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nativeTypeDefault = ifaceName
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# For generated iterator interfaces for other iterable interfaces, we
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# just use IterableIterator as the native type, templated on the
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# nativeType of the iterable interface. That way we can have a
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# templated implementation for all the duplicated iterator
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# functionality.
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if self.interface.isIteratorInterface():
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itrName = self.interface.iterableInterface.identifier.name
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itrDesc = self.getDescriptor(itrName)
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nativeTypeDefault = iteratorNativeType(itrDesc)
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typeName = desc.get('nativeType', nativeTypeDefault)
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spiderMonkeyInterface = desc.get('spiderMonkeyInterface', False)
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# Callback and SpiderMonkey types do not use JS smart pointers, so we should not use the
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# built-in rooting mechanisms for them.
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if spiderMonkeyInterface:
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self.returnType = 'Rc<%s>' % typeName
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self.argumentType = '&%s' % typeName
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self.nativeType = typeName
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pathDefault = 'dom::types::%s' % typeName
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elif self.interface.isCallback():
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ty = 'dom::bindings::codegen::Bindings::%sBinding::%s' % (ifaceName, ifaceName)
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pathDefault = ty
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self.returnType = "Rc<%s>" % ty
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self.argumentType = "???"
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self.nativeType = ty
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else:
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self.returnType = "Root<%s>" % typeName
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self.argumentType = "&%s" % typeName
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self.nativeType = "*const %s" % typeName
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if self.interface.isIteratorInterface():
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pathDefault = 'dom::bindings::iterable::IterableIterator'
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else:
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pathDefault = 'dom::types::%s' % MakeNativeName(typeName)
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self.concreteType = typeName
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self.register = desc.get('register', True)
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self.path = desc.get('path', pathDefault)
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self.bindingPath = 'dom::bindings::codegen::Bindings::%s' % ('::'.join([ifaceName + 'Binding'] * 2))
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self.outerObjectHook = desc.get('outerObjectHook', 'None')
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self.proxy = False
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self.weakReferenceable = desc.get('weakReferenceable', False)
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# If we're concrete, we need to crawl our ancestor interfaces and mark
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# them as having a concrete descendant.
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self.concrete = (not self.interface.isCallback() and
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not self.interface.isNamespace() and
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not self.interface.getExtendedAttribute("Abstract") and
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not self.interface.getExtendedAttribute("Inline") and
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not spiderMonkeyInterface)
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self.hasUnforgeableMembers = (self.concrete and
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any(MemberIsUnforgeable(m, self) for m in
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self.interface.members))
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self.operations = {
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'IndexedGetter': None,
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'IndexedSetter': None,
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'IndexedDeleter': None,
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'NamedGetter': None,
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'NamedSetter': None,
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'NamedDeleter': None,
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'Stringifier': None,
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}
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def addOperation(operation, m):
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if not self.operations[operation]:
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self.operations[operation] = m
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# Since stringifiers go on the prototype, we only need to worry
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# about our own stringifier, not those of our ancestor interfaces.
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for m in self.interface.members:
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if m.isMethod() and m.isStringifier():
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addOperation('Stringifier', m)
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if self.concrete:
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iface = self.interface
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while iface:
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for m in iface.members:
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if not m.isMethod():
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continue
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def addIndexedOrNamedOperation(operation, m):
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self.proxy = True
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if m.isIndexed():
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operation = 'Indexed' + operation
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else:
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assert m.isNamed()
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operation = 'Named' + operation
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addOperation(operation, m)
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if m.isGetter():
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addIndexedOrNamedOperation('Getter', m)
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if m.isSetter():
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addIndexedOrNamedOperation('Setter', m)
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if m.isCreator():
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addIndexedOrNamedOperation('Creator', m)
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if m.isDeleter():
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addIndexedOrNamedOperation('Deleter', m)
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iface = iface.parent
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if iface:
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iface.setUserData('hasConcreteDescendant', True)
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if self.proxy:
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iface = self.interface
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while iface.parent:
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iface = iface.parent
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iface.setUserData('hasProxyDescendant', True)
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self.name = interface.identifier.name
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# self.extendedAttributes is a dict of dicts, keyed on
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# all/getterOnly/setterOnly and then on member name. Values are an
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# array of extended attributes.
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self.extendedAttributes = {'all': {}, 'getterOnly': {}, 'setterOnly': {}}
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def addExtendedAttribute(attribute, config):
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def add(key, members, attribute):
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for member in members:
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self.extendedAttributes[key].setdefault(member, []).append(attribute)
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if isinstance(config, dict):
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for key in ['all', 'getterOnly', 'setterOnly']:
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add(key, config.get(key, []), attribute)
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elif isinstance(config, list):
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add('all', config, attribute)
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else:
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assert isinstance(config, str)
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if config == '*':
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iface = self.interface
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while iface:
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add('all', map(lambda m: m.name, iface.members), attribute)
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iface = iface.parent
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else:
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add('all', [config], attribute)
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self._binaryNames = desc.get('binaryNames', {})
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self._binaryNames.setdefault('__legacycaller', 'LegacyCall')
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self._binaryNames.setdefault('__stringifier', 'Stringifier')
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self._internalNames = desc.get('internalNames', {})
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for member in self.interface.members:
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if not member.isAttr() and not member.isMethod():
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continue
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binaryName = member.getExtendedAttribute("BinaryName")
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if binaryName:
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assert isinstance(binaryName, list)
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assert len(binaryName) == 1
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self._binaryNames.setdefault(member.identifier.name,
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binaryName[0])
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self._internalNames.setdefault(member.identifier.name,
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member.identifier.name.replace('-', '_'))
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# Build the prototype chain.
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self.prototypeChain = []
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parent = interface
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while parent:
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self.prototypeChain.insert(0, parent.identifier.name)
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parent = parent.parent
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self.prototypeDepth = len(self.prototypeChain) - 1
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config.maxProtoChainLength = max(config.maxProtoChainLength,
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len(self.prototypeChain))
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def binaryNameFor(self, name):
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return self._binaryNames.get(name, name)
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def internalNameFor(self, name):
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return self._internalNames.get(name, name)
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def getExtendedAttributes(self, member, getter=False, setter=False):
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def maybeAppendInfallibleToAttrs(attrs, throws):
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if throws is None:
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attrs.append("infallible")
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elif throws is True:
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pass
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else:
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raise TypeError("Unknown value for 'Throws'")
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name = member.identifier.name
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if member.isMethod():
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attrs = self.extendedAttributes['all'].get(name, [])
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throws = member.getExtendedAttribute("Throws")
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maybeAppendInfallibleToAttrs(attrs, throws)
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return attrs
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assert member.isAttr()
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assert bool(getter) != bool(setter)
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key = 'getterOnly' if getter else 'setterOnly'
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attrs = self.extendedAttributes['all'].get(name, []) + self.extendedAttributes[key].get(name, [])
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throws = member.getExtendedAttribute("Throws")
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if throws is None:
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throwsAttr = "GetterThrows" if getter else "SetterThrows"
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throws = member.getExtendedAttribute(throwsAttr)
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maybeAppendInfallibleToAttrs(attrs, throws)
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return attrs
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def getParentName(self):
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parent = self.interface.parent
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while parent:
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if not parent.getExtendedAttribute("Inline"):
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return parent.identifier.name
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parent = parent.parent
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return None
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def hasDescendants(self):
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return (self.interface.getUserData("hasConcreteDescendant", False) or
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self.interface.getUserData("hasProxyDescendant", False))
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def shouldHaveGetConstructorObjectMethod(self):
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assert self.interface.hasInterfaceObject()
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if self.interface.getExtendedAttribute("Inline"):
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return False
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return (self.interface.isCallback() or self.interface.isNamespace() or
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self.hasDescendants() or self.interface.getExtendedAttribute("HTMLConstructor"))
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def shouldCacheConstructor(self):
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return self.hasDescendants() or self.interface.getExtendedAttribute("HTMLConstructor")
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def isExposedConditionally(self):
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return self.interface.isExposedConditionally()
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def isGlobal(self):
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"""
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Returns true if this is the primary interface for a global object
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of some sort.
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"""
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return bool(self.interface.getExtendedAttribute("Global") or
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self.interface.getExtendedAttribute("PrimaryGlobal"))
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# Some utility methods
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def MakeNativeName(name):
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return name[0].upper() + name[1:]
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def getModuleFromObject(object):
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return ('dom::bindings::codegen::Bindings::' +
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os.path.basename(object.location.filename()).split('.webidl')[0] + 'Binding')
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def getTypesFromDescriptor(descriptor):
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"""
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Get all argument and return types for all members of the descriptor
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"""
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members = [m for m in descriptor.interface.members]
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if descriptor.interface.ctor():
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members.append(descriptor.interface.ctor())
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members.extend(descriptor.interface.namedConstructors)
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signatures = [s for m in members if m.isMethod() for s in m.signatures()]
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types = []
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for s in signatures:
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assert len(s) == 2
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(returnType, arguments) = s
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types.append(returnType)
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types.extend(a.type for a in arguments)
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types.extend(a.type for a in members if a.isAttr())
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return types
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def getTypesFromDictionary(dictionary):
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"""
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Get all member types for this dictionary
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"""
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if isinstance(dictionary, IDLWrapperType):
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dictionary = dictionary.inner
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types = []
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curDict = dictionary
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while curDict:
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types.extend([m.type for m in curDict.members])
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curDict = curDict.parent
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return types
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def getTypesFromCallback(callback):
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"""
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Get the types this callback depends on: its return type and the
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types of its arguments.
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"""
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sig = callback.signatures()[0]
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types = [sig[0]] # Return type
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types.extend(arg.type for arg in sig[1]) # Arguments
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return types
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def iteratorNativeType(descriptor, infer=False):
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assert descriptor.interface.isIterable()
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iterableDecl = descriptor.interface.maplikeOrSetlikeOrIterable
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assert iterableDecl.isPairIterator()
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return "IterableIterator%s" % ("" if infer else '<%s>' % descriptor.interface.identifier.name)
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