gecko/dom/bindings/Configuration.py
Boris Zbarsky 271c035440 Bug 792980. Don't force consumers to list descriptors for interfaces that are using all teh defaults. r=peterv
The new setup is:

* Consequential interfaces with no explicit descriptor are still skipped.
* If no information is provided about an interface, an empty descriptor is
  assumed.
* If a list is provided and the only entry is a worker descriptor, an empty
  main-thread descriptor is assumed.
2012-10-01 08:56:31 -04:00

357 lines
15 KiB
Python

# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this file,
# You can obtain one at http://mozilla.org/MPL/2.0/.
from WebIDL import IDLInterface, IDLExternalInterface
autogenerated_comment = "/* THIS FILE IS AUTOGENERATED - DO NOT EDIT */\n"
class Configuration:
"""
Represents global configuration state based on IDL parse data and
the configuration file.
"""
def __init__(self, filename, parseData):
# Read the configuration file.
glbl = {}
execfile(filename, glbl)
config = glbl['DOMInterfaces']
# Build descriptors for all the interfaces we have in the parse data.
# This allows callers to specify a subset of interfaces by filtering
# |parseData|.
self.descriptors = []
self.interfaces = {}
self.maxProtoChainLength = 0;
for thing in parseData:
# Some toplevel things are sadly types, and those have an
# isInterface that doesn't mean the same thing as IDLObject's
# isInterface()...
if (not isinstance(thing, IDLInterface) and
not isinstance(thing, IDLExternalInterface)):
continue
iface = thing
self.interfaces[iface.identifier.name] = iface
if iface.identifier.name not in config:
# Completely skip consequential interfaces with no descriptor
# because chances are we don't need to do anything interesting
# with them.
if iface.isConsequential():
continue
entry = {}
else:
entry = config[iface.identifier.name]
if not isinstance(entry, list):
assert isinstance(entry, dict)
entry = [entry]
elif len(entry) == 1 and entry[0].get("workers", False):
# List with only a workers descriptor means we should
# infer a mainthread descriptor. If you want only
# workers bindings, don't use a list here.
entry.append({})
self.descriptors.extend([Descriptor(self, iface, x) for x in entry])
# Mark the descriptors for which only a single nativeType implements
# an interface.
for descriptor in self.descriptors:
intefaceName = descriptor.interface.identifier.name
otherDescriptors = [d for d in self.descriptors
if d.interface.identifier.name == intefaceName]
descriptor.uniqueImplementation = len(otherDescriptors) == 1
self.enums = [e for e in parseData if e.isEnum()]
self.dictionaries = [d for d in parseData if d.isDictionary()]
# Keep the descriptor list sorted for determinism.
self.descriptors.sort(lambda x,y: cmp(x.name, y.name))
def getInterface(self, ifname):
return self.interfaces[ifname]
def getDescriptors(self, **filters):
"""Gets the descriptors that match the given filters."""
curr = self.descriptors
for key, val in filters.iteritems():
if key == 'webIDLFile':
getter = lambda x: x.interface.filename()
elif key == 'hasInterfaceObject':
getter = lambda x: (not x.interface.isExternal() and
x.interface.hasInterfaceObject())
elif key == 'hasInterfacePrototypeObject':
getter = lambda x: (not x.interface.isExternal() and
x.interface.hasInterfacePrototypeObject())
elif key == 'hasInterfaceOrInterfacePrototypeObject':
getter = lambda x: x.hasInterfaceOrInterfacePrototypeObject()
elif key == 'isCallback':
getter = lambda x: x.interface.isCallback()
elif key == 'isExternal':
getter = lambda x: x.interface.isExternal()
else:
getter = lambda x: getattr(x, key)
curr = filter(lambda x: getter(x) == val, curr)
return curr
def getEnums(self, webIDLFile):
return filter(lambda e: e.filename() == webIDLFile, self.enums)
def getDictionaries(self, webIDLFile):
return filter(lambda d: d.filename() == webIDLFile, self.dictionaries)
def getDescriptor(self, interfaceName, workers):
"""
Gets the appropriate descriptor for the given interface name
and the given workers boolean.
"""
iface = self.getInterface(interfaceName)
descriptors = self.getDescriptors(interface=iface)
# The only filter we currently have is workers vs non-workers.
matches = filter(lambda x: x.workers is workers, descriptors)
# After filtering, we should have exactly one result.
if len(matches) is not 1:
raise NoSuchDescriptorError("For " + interfaceName + " found " +
str(len(matches)) + " matches");
return matches[0]
def getDescriptorProvider(self, workers):
"""
Gets a descriptor provider that can provide descriptors as needed,
for the given workers boolean
"""
return DescriptorProvider(self, workers)
class NoSuchDescriptorError(TypeError):
def __init__(self, str):
TypeError.__init__(self, str)
class DescriptorProvider:
"""
A way of getting descriptors for interface names
"""
def __init__(self, config, workers):
self.config = config
self.workers = workers
def getDescriptor(self, interfaceName):
"""
Gets the appropriate descriptor for the given interface name given the
context of the current descriptor. This selects the appropriate
implementation for cases like workers.
"""
return self.config.getDescriptor(interfaceName, self.workers)
class Descriptor(DescriptorProvider):
"""
Represents a single descriptor for an interface. See Bindings.conf.
"""
def __init__(self, config, interface, desc):
DescriptorProvider.__init__(self, config, desc.get('workers', False))
self.interface = interface
# Read the desc, and fill in the relevant defaults.
ifaceName = self.interface.identifier.name
if self.interface.isExternal() or self.interface.isCallback():
if self.workers:
nativeTypeDefault = "JSObject"
else:
nativeTypeDefault = "nsIDOM" + ifaceName
else:
if self.workers:
nativeTypeDefault = "mozilla::dom::workers::" + ifaceName
else:
nativeTypeDefault = "mozilla::dom::" + ifaceName
self.nativeType = desc.get('nativeType', nativeTypeDefault)
self.hasInstanceInterface = desc.get('hasInstanceInterface', None)
# Do something sane for JSObject
if self.nativeType == "JSObject":
headerDefault = "jsapi.h"
else:
if self.workers:
headerDefault = "mozilla/dom/workers/bindings/%s.h" % ifaceName
else:
headerDefault = self.nativeType
headerDefault = headerDefault.replace("::", "/") + ".h"
self.headerFile = desc.get('headerFile', headerDefault)
if self.interface.isCallback() or self.interface.isExternal():
if 'castable' in desc:
raise TypeError("%s is external or callback but has a castable "
"setting" % self.interface.identifier.name)
self.castable = False
else:
self.castable = desc.get('castable', True)
self.notflattened = desc.get('notflattened', False)
self.register = desc.get('register', True)
self.hasXPConnectImpls = desc.get('hasXPConnectImpls', False)
# If we're concrete, we need to crawl our ancestor interfaces and mark
# them as having a concrete descendant.
self.concrete = desc.get('concrete', not self.interface.isExternal())
if self.concrete:
self.proxy = False
operations = {
'IndexedGetter': None,
'IndexedSetter': None,
'IndexedCreator': None,
'IndexedDeleter': None,
'NamedGetter': None,
'NamedSetter': None,
'NamedCreator': None,
'NamedDeleter': None,
'Stringifier': None
}
iface = self.interface
while iface:
for m in iface.members:
if not m.isMethod():
continue
def addOperation(operation, m):
if not operations[operation]:
operations[operation] = m
def addIndexedOrNamedOperation(operation, m):
self.proxy = True
if m.isIndexed():
operation = 'Indexed' + operation
else:
assert m.isNamed()
operation = 'Named' + operation
addOperation(operation, m)
if m.isStringifier():
addOperation('Stringifier', m)
else:
if m.isGetter():
addIndexedOrNamedOperation('Getter', m)
if m.isSetter():
addIndexedOrNamedOperation('Setter', m)
if m.isCreator():
addIndexedOrNamedOperation('Creator', m)
if m.isDeleter():
addIndexedOrNamedOperation('Deleter', m)
raise TypeError("deleter specified on %s but we "
"don't support deleters yet" %
self.interface.identifier.name)
iface.setUserData('hasConcreteDescendant', True)
iface = iface.parent
if self.proxy:
self.operations = operations
iface = self.interface
while iface:
iface.setUserData('hasProxyDescendant', True)
iface = iface.parent
if self.interface.isExternal() and 'prefable' in desc:
raise TypeError("%s is external but has a prefable setting" %
self.interface.identifier.name)
self.prefable = desc.get('prefable', False)
if self.workers:
if desc.get('nativeOwnership', 'worker') != 'worker':
raise TypeError("Worker descriptor for %s should have 'worker' "
"as value for nativeOwnership" %
self.interface.identifier.name)
self.nativeOwnership = "worker"
else:
self.nativeOwnership = desc.get('nativeOwnership', 'nsisupports')
if not self.nativeOwnership in ['owned', 'refcounted', 'nsisupports']:
raise TypeError("Descriptor for %s has unrecognized value (%s) "
"for nativeOwnership" %
(self.interface.identifier.name, self.nativeOwnership))
self.customTrace = desc.get('customTrace', self.workers)
self.customFinalize = desc.get('customFinalize', self.workers)
self.wrapperCache = self.workers or desc.get('wrapperCache', True)
if not self.wrapperCache and self.prefable:
raise TypeError("Descriptor for %s is prefable but not wrappercached" %
self.interface.identifier.name)
def make_name(name):
return name + "_workers" if self.workers else name
self.name = make_name(interface.identifier.name)
# self.extendedAttributes is a dict of dicts, keyed on
# all/getterOnly/setterOnly and then on member name. Values are an
# array of extended attributes.
self.extendedAttributes = { 'all': {}, 'getterOnly': {}, 'setterOnly': {} }
def addExtendedAttribute(attribute, config):
def add(key, members, attribute):
for member in members:
self.extendedAttributes[key].setdefault(member, []).append(attribute)
if isinstance(config, dict):
for key in ['all', 'getterOnly', 'setterOnly']:
add(key, config.get(key, []), attribute)
elif isinstance(config, list):
add('all', config, attribute)
else:
assert isinstance(config, str)
if config == '*':
iface = self.interface
while iface:
add('all', map(lambda m: m.name, iface.members), attribute)
iface = iface.parent
else:
add('all', [config], attribute)
for attribute in ['implicitJSContext', 'resultNotAddRefed']:
addExtendedAttribute(attribute, desc.get(attribute, {}))
self.binaryNames = desc.get('binaryNames', {})
# Build the prototype chain.
self.prototypeChain = []
parent = interface
while parent:
self.prototypeChain.insert(0, make_name(parent.identifier.name))
parent = parent.parent
config.maxProtoChainLength = max(config.maxProtoChainLength,
len(self.prototypeChain))
def hasInterfaceOrInterfacePrototypeObject(self):
# Forward-declared interfaces don't need either interface object or
# interface prototype object as they're going to use QI (on main thread)
# or be passed as a JSObject (on worker threads).
if self.interface.isExternal():
return False
return self.interface.hasInterfaceObject() or self.interface.hasInterfacePrototypeObject()
def getExtendedAttributes(self, member, getter=False, setter=False):
def ensureValidThrowsExtendedAttribute(attr):
assert(attr is None or attr is True or len(attr) == 1)
if (attr is not None and attr is not True and
'Workers' not in attr and 'MainThread' not in attr):
raise TypeError("Unknown value for 'Throws': " + attr[0])
def maybeAppendInfallibleToAttrs(attrs, throws):
ensureValidThrowsExtendedAttribute(throws)
if (throws is None or
(throws is not True and
('Workers' not in throws or not self.workers) and
('MainThread' not in throws or self.workers))):
attrs.append("infallible")
name = member.identifier.name
if member.isMethod():
attrs = self.extendedAttributes['all'].get(name, [])
throws = member.getExtendedAttribute("Throws")
maybeAppendInfallibleToAttrs(attrs, throws)
return attrs
assert member.isAttr()
assert bool(getter) != bool(setter)
key = 'getterOnly' if getter else 'setterOnly'
attrs = self.extendedAttributes['all'].get(name, []) + self.extendedAttributes[key].get(name, [])
throws = member.getExtendedAttribute("Throws")
if throws is None:
throwsAttr = "GetterThrows" if getter else "SetterThrows"
throws = member.getExtendedAttribute(throwsAttr)
maybeAppendInfallibleToAttrs(attrs, throws)
return attrs