emscripten/third_party/WebIDL.py at incoming · JavaScriptIOT/emscripten · GitHub

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# from http://mxr.mozilla.org/mozilla-central/source/dom/bindings/parser/WebIDL.py

# rev 501baeb3a034

# 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/.

""" A WebIDL parser. """

from ply import lex, yacc

import re

import os

import traceback

import math

# Machinery

def parseInt(literal):

string = literal

sign = 0

base = 0

if string[0] == '-':

sign = -1

string = string[1:]

else:

sign = 1

if string[0] == '0' and len(string) > 1:

if string[1] == 'x' or string[1] == 'X':

base = 16

string = string[2:]

else:

base = 8

string = string[1:]

else:

base = 10

value = int(string, base)

return value * sign

# Magic for creating enums

def M_add_class_attribs(name, base, attribs, start):

dict_ = dict()

for v, k in enumerate(attribs):

dict_[k] = start + v

assert 'length' not in dict_

dict_['length'] = start + len(attribs)

return type(name, (base,), dict_)

def enum(*names, **kw):

if len(kw) == 1:

base = kw['base'].__class__

start = base.length

else:

assert len(kw) == 0

base = object

start = 0

Foo = M_add_class_attribs("Foo", base, names, start)

def __setattr__(self, name, value): # this makes it read-only

raise NotImplementedError

Foo.__setattr__ = __setattr__

return Foo()

class WebIDLError(Exception):

def __init__(self, message, locations, warning=False):

self.message = message

self.locations = [str(loc) for loc in locations]

self.warning = warning

def __str__(self):

return "%s: %s%s%s" % (self.warning and 'warning' or 'error',

self.message,

", " if len(self.locations) != 0 else "",

"\n".join(self.locations))

class Location(object):

def __init__(self, lexer, lineno, lexpos, filename):

self._line = None

self._lineno = lineno

self._lexpos = lexpos

self._lexdata = lexer.lexdata

self._file = filename if filename else "<unknown>"

def __eq__(self, other):

return self._lexpos == other._lexpos and \

self._file == other._file

def filename(self):

return self._file

def resolve(self):

if self._line:

return

startofline = self._lexdata.rfind('\n', 0, self._lexpos) + 1

endofline = self._lexdata.find('\n', self._lexpos, self._lexpos + 80)

if endofline != -1:

self._line = self._lexdata[startofline:endofline]

else:

self._line = self._lexdata[startofline:]

self._colno = self._lexpos - startofline

# Our line number seems to point to the start of self._lexdata

self._lineno += self._lexdata.count('\n', 0, startofline)

def get(self):

self.resolve()

return "%s line %s:%s" % (self._file, self._lineno, self._colno)

def _pointerline(self):

return " " * self._colno + "^"

def __str__(self):

self.resolve()

return "%s line %s:%s\n%s\n%s" % (self._file, self._lineno, self._colno,

self._line, self._pointerline())

class BuiltinLocation(object):

def __init__(self, text):

self.msg = text + "\n"

def __eq__(self, other):

return isinstance(other, BuiltinLocation) and \

self.msg == other.msg

def filename(self):

return '<builtin>'

def resolve(self):

pass

def get(self):

return self.msg

def __str__(self):

return self.get()

# Data Model

class IDLObject(object):

def __init__(self, location):

self.location = location

self.userData = dict()

def filename(self):

return self.location.filename()

def isInterface(self):

return False

def isEnum(self):

return False

def isCallback(self):

return False

def isType(self):

return False

def isDictionary(self):

return False;

def isUnion(self):

return False

def getUserData(self, key, default):

return self.userData.get(key, default)

def setUserData(self, key, value):

self.userData[key] = value

def addExtendedAttributes(self, attrs):

assert False # Override me!

def handleExtendedAttribute(self, attr):

assert False # Override me!

def _getDependentObjects(self):

assert False # Override me!

def getDeps(self, visited=None):

""" Return a set of files that this object depends on. If any of

these files are changed the parser needs to be rerun to regenerate

a new IDLObject.

The visited argument is a set of all the objects already visited.

We must test to see if we are in it, and if so, do nothing. This

prevents infinite recursion."""

# NB: We can't use visited=set() above because the default value is

# evaluated when the def statement is evaluated, not when the function

# is executed, so there would be one set for all invocations.

if visited == None:

visited = set()

if self in visited:

return set()

visited.add(self)

deps = set()

if self.filename() != "<builtin>":

deps.add(self.filename())

for d in self._getDependentObjects():

deps = deps.union(d.getDeps(visited))

return deps

class IDLScope(IDLObject):

def __init__(self, location, parentScope, identifier):

IDLObject.__init__(self, location)

self.parentScope = parentScope

if identifier:

assert isinstance(identifier, IDLIdentifier)

self._name = identifier

else:

self._name = None

self._dict = {}

def __str__(self):

return self.QName()

def QName(self):

if self._name:

return self._name.QName() + "::"

return "::"

def ensureUnique(self, identifier, object):

"""

Ensure that there is at most one 'identifier' in scope ('self').

Note that object can be None. This occurs if we end up here for an

interface type we haven't seen yet.

"""

assert isinstance(identifier, IDLUnresolvedIdentifier)

assert not object or isinstance(object, IDLObjectWithIdentifier)

assert not object or object.identifier == identifier

if identifier.name in self._dict:

if not object:

return

# ensureUnique twice with the same object is not allowed

assert id(object) != id(self._dict[identifier.name])

replacement = self.resolveIdentifierConflict(self, identifier,

self._dict[identifier.name],

object)

self._dict[identifier.name] = replacement

return

assert object

self._dict[identifier.name] = object

def resolveIdentifierConflict(self, scope, identifier, originalObject, newObject):

if isinstance(originalObject, IDLExternalInterface) and \

isinstance(newObject, IDLExternalInterface) and \

originalObject.identifier.name == newObject.identifier.name:

return originalObject

if (isinstance(originalObject, IDLExternalInterface) or

isinstance(newObject, IDLExternalInterface)):

raise WebIDLError(

"Name collision between "

"interface declarations for identifier '%s' at '%s' and '%s'"

% (identifier.name,

originalObject.location, newObject.location), [])

# We do the merging of overloads here as opposed to in IDLInterface

# because we need to merge overloads of NamedConstructors and we need to

# detect conflicts in those across interfaces. See also the comment in

# IDLInterface.addExtendedAttributes for "NamedConstructor".

if originalObject.tag == IDLInterfaceMember.Tags.Method and \

newObject.tag == IDLInterfaceMember.Tags.Method:

return originalObject.addOverload(newObject)

# Default to throwing, derived classes can override.

conflictdesc = "\n\t%s at %s\n\t%s at %s" % \

(originalObject, originalObject.location, newObject, newObject.location)

raise WebIDLError(

"Multiple unresolvable definitions of identifier '%s' in scope '%s%s"

% (identifier.name, str(self), conflictdesc), [])

def _lookupIdentifier(self, identifier):

return self._dict[identifier.name]

def lookupIdentifier(self, identifier):

assert isinstance(identifier, IDLIdentifier)

assert identifier.scope == self

return self._lookupIdentifier(identifier)

class IDLIdentifier(IDLObject):

def __init__(self, location, scope, name):

IDLObject.__init__(self, location)

self.name = name

assert isinstance(scope, IDLScope)

self.scope = scope

def __str__(self):

return self.QName()

def QName(self):

return self.scope.QName() + self.name

def __hash__(self):

return self.QName().__hash__()

def __eq__(self, other):

return self.QName() == other.QName()

def object(self):

return self.scope.lookupIdentifier(self)

class IDLUnresolvedIdentifier(IDLObject):

def __init__(self, location, name, allowDoubleUnderscore = False,

allowForbidden = False):

IDLObject.__init__(self, location)

assert len(name) > 0

if name[:2] == "__" and name != "__content" and name != "___noSuchMethod__" and not allowDoubleUnderscore:

raise WebIDLError("Identifiers beginning with __ are reserved",

[location])

if name[0] == '_' and not allowDoubleUnderscore:

name = name[1:]

# TODO: Bug 872377, Restore "toJSON" to below list.

# We sometimes need custom serialization, so allow toJSON for now.

if (name in ["constructor", "toString"] and

not allowForbidden):

raise WebIDLError("Cannot use reserved identifier '%s'" % (name),

[location])

self.name = name

def __str__(self):

return self.QName()

def QName(self):

return "<unresolved scope>::" + self.name

def resolve(self, scope, object):

assert isinstance(scope, IDLScope)

assert not object or isinstance(object, IDLObjectWithIdentifier)

assert not object or object.identifier == self

scope.ensureUnique(self, object)

identifier = IDLIdentifier(self.location, scope, self.name)

if object:

object.identifier = identifier

return identifier

def finish(self):

assert False # Should replace with a resolved identifier first.

class IDLObjectWithIdentifier(IDLObject):

def __init__(self, location, parentScope, identifier):

IDLObject.__init__(self, location)

assert isinstance(identifier, IDLUnresolvedIdentifier)

self.identifier = identifier

if parentScope:

self.resolve(parentScope)

self.treatNullAs = "Default"

def resolve(self, parentScope):

assert isinstance(parentScope, IDLScope)

assert isinstance(self.identifier, IDLUnresolvedIdentifier)

self.identifier.resolve(parentScope, self)

def checkForStringHandlingExtendedAttributes(self, attrs,

isDictionaryMember=False,

isOptional=False):

"""

A helper function to deal with TreatNullAs. Returns the list

of attrs it didn't handle itself.

"""

assert isinstance(self, IDLArgument) or isinstance(self, IDLAttribute)

unhandledAttrs = list()

for attr in attrs:

if not attr.hasValue():

unhandledAttrs.append(attr)

continue

identifier = attr.identifier()

value = attr.value()

if identifier == "TreatNullAs":

if not self.type.isDOMString() or self.type.nullable():

raise WebIDLError("[TreatNullAs] is only allowed on "

"arguments or attributes whose type is "

"DOMString",

[self.location])

if isDictionaryMember:

raise WebIDLError("[TreatNullAs] is not allowed for "

"dictionary members", [self.location])

if value != 'EmptyString':

raise WebIDLError("[TreatNullAs] must take the identifier "

"'EmptyString', not '%s'" % value,

[self.location])

self.treatNullAs = value

else:

unhandledAttrs.append(attr)

return unhandledAttrs

class IDLObjectWithScope(IDLObjectWithIdentifier, IDLScope):

def __init__(self, location, parentScope, identifier):

assert isinstance(identifier, IDLUnresolvedIdentifier)

IDLObjectWithIdentifier.__init__(self, location, parentScope, identifier)

IDLScope.__init__(self, location, parentScope, self.identifier)

class IDLIdentifierPlaceholder(IDLObjectWithIdentifier):

def __init__(self, location, identifier):

assert isinstance(identifier, IDLUnresolvedIdentifier)

IDLObjectWithIdentifier.__init__(self, location, None, identifier)

def finish(self, scope):

try:

scope._lookupIdentifier(self.identifier)

except:

raise WebIDLError("Unresolved type '%s'." % self.identifier,

[self.location])

obj = self.identifier.resolve(scope, None)

return scope.lookupIdentifier(obj)

class IDLExternalInterface(IDLObjectWithIdentifier):

def __init__(self, location, parentScope, identifier):

assert isinstance(identifier, IDLUnresolvedIdentifier)

assert isinstance(parentScope, IDLScope)

self.parent = None

IDLObjectWithIdentifier.__init__(self, location, parentScope, identifier)

IDLObjectWithIdentifier.resolve(self, parentScope)

def finish(self, scope):

pass

def validate(self):

pass

def isExternal(self):

return True

def isInterface(self):

return True

def isConsequential(self):

return False

def addExtendedAttributes(self, attrs):

assert len(attrs) == 0

def resolve(self, parentScope):

pass

def getJSImplementation(self):

return None

def isJSImplemented(self):

return False

def getNavigatorProperty(self):

return None

def _getDependentObjects(self):

return set()

class IDLInterface(IDLObjectWithScope):

def __init__(self, location, parentScope, name, parent, members,

isPartial):

assert isinstance(parentScope, IDLScope)

assert isinstance(name, IDLUnresolvedIdentifier)

assert not isPartial or not parent

self.parent = None

self._callback = False

self._finished = False

self.members = []

# namedConstructors needs deterministic ordering because bindings code

# outputs the constructs in the order that namedConstructors enumerates

# them.

self.namedConstructors = list()

self.implementedInterfaces = set()

self._consequential = False

self._isPartial = True

# self.interfacesBasedOnSelf is the set of interfaces that inherit from

# self or have self as a consequential interface, including self itself.

# Used for distinguishability checking.

self.interfacesBasedOnSelf = set([self])

# self.interfacesImplementingSelf is the set of interfaces that directly

# have self as a consequential interface

self.interfacesImplementingSelf = set()

self._hasChildInterfaces = False

self._isOnGlobalProtoChain = False

# Tracking of the number of reserved slots we need for our

# members and those of ancestor interfaces.

self.totalMembersInSlots = 0

# Tracking of the number of own own members we have in slots

self._ownMembersInSlots = 0

IDLObjectWithScope.__init__(self, location, parentScope, name)

if not isPartial:

self.setNonPartial(location, parent, members)

else:

# Just remember our members for now

self.members = members

def __str__(self):

return "Interface '%s'" % self.identifier.name

def ctor(self):

identifier = IDLUnresolvedIdentifier(self.location, "constructor",

allowForbidden=True)

try:

return self._lookupIdentifier(identifier)

except:

return None

def resolveIdentifierConflict(self, scope, identifier, originalObject, newObject):

assert isinstance(scope, IDLScope)

assert isinstance(originalObject, IDLInterfaceMember)

assert isinstance(newObject, IDLInterfaceMember)

retval = IDLScope.resolveIdentifierConflict(self, scope, identifier,

originalObject, newObject)

# Might be a ctor, which isn't in self.members

if newObject in self.members:

self.members.remove(newObject)

return retval

def finish(self, scope):

if self._finished:

return

self._finished = True

if self._isPartial:

raise WebIDLError("Interface %s does not have a non-partial "

"declaration" % self.identifier.name,

[self.location])

assert not self.parent or isinstance(self.parent, IDLIdentifierPlaceholder)

parent = self.parent.finish(scope) if self.parent else None

if parent and isinstance(parent, IDLExternalInterface):

raise WebIDLError("%s inherits from %s which does not have "

"a definition" %

(self.identifier.name,

self.parent.identifier.name),

[self.location])

assert not parent or isinstance(parent, IDLInterface)

self.parent = parent

assert iter(self.members)

if self.parent:

self.parent.finish(scope)

self.parent._hasChildInterfaces = True

self.totalMembersInSlots = self.parent.totalMembersInSlots

# Interfaces with [Global] must not have anything inherit from them

if self.parent.getExtendedAttribute("Global"):

# Note: This is not a self.parent.isOnGlobalProtoChain() check

# because ancestors of a [Global] interface can have other

# descendants.

raise WebIDLError("[Global] interface has another interface "

"inheriting from it",

[self.location, self.parent.location])

# Callbacks must not inherit from non-callbacks or inherit from

# anything that has consequential interfaces.

# XXXbz Can non-callbacks inherit from callbacks? Spec issue pending.

# XXXbz Can callbacks have consequential interfaces? Spec issue pending

if self.isCallback():

if not self.parent.isCallback():

raise WebIDLError("Callback interface %s inheriting from "

"non-callback interface %s" %

(self.identifier.name,

self.parent.identifier.name),

[self.location, self.parent.location])

elif self.parent.isCallback():

raise WebIDLError("Non-callback interface %s inheriting from "

"callback interface %s" %

(self.identifier.name,

self.parent.identifier.name),

[self.location, self.parent.location])

for iface in self.implementedInterfaces:

iface.finish(scope)

cycleInGraph = self.findInterfaceLoopPoint(self)

if cycleInGraph:

raise WebIDLError("Interface %s has itself as ancestor or "

"implemented interface" % self.identifier.name,

[self.location, cycleInGraph.location])

if self.isCallback():

# "implements" should have made sure we have no

# consequential interfaces.

assert len(self.getConsequentialInterfaces()) == 0

# And that we're not consequential.

assert not self.isConsequential()

# Now resolve() and finish() our members before importing the

# ones from our implemented interfaces.

# resolve() will modify self.members, so we need to iterate

# over a copy of the member list here.

for member in list(self.members):

member.resolve(self)

for member in self.members:

member.finish(scope)

ctor = self.ctor()

if ctor is not None:

ctor.finish(scope)

for ctor in self.namedConstructors:

ctor.finish(scope)

# Make a copy of our member list, so things that implement us

# can get those without all the stuff we implement ourselves

# admixed.

self.originalMembers = list(self.members)

# Import everything from our consequential interfaces into

# self.members. Sort our consequential interfaces by name

# just so we have a consistent order.

for iface in sorted(self.getConsequentialInterfaces(),

key=lambda x: x.identifier.name):

# Flag the interface as being someone's consequential interface

iface.setIsConsequentialInterfaceOf(self)

additionalMembers = iface.originalMembers;

for additionalMember in additionalMembers[:]:

for member in self.members:

if additionalMember.identifier.name == member.identifier.name:

# XXX emscripten: allow such name collisions, ignore parent

additionalMembers.remove(additionalMember)

#raise WebIDLError(

# "Multiple definitions of %s on %s coming from 'implements' statements" %

# (member.identifier.name, self),

# [additionalMember.location, member.location])

self.members.extend(additionalMembers)

iface.interfacesImplementingSelf.add(self)

for ancestor in self.getInheritedInterfaces():

ancestor.interfacesBasedOnSelf.add(self)

for ancestorConsequential in ancestor.getConsequentialInterfaces():

ancestorConsequential.interfacesBasedOnSelf.add(self)

for member in self.members:

if (member.isAttr() and member.isUnforgeable() and

not hasattr(member, "originatingInterface")):

member.originatingInterface = self

# Compute slot indices for our members before we pull in

# unforgeable members from our parent.

for member in self.members:

if (member.isAttr() and

(member.getExtendedAttribute("StoreInSlot") or

member.getExtendedAttribute("Cached"))):

member.slotIndex = self.totalMembersInSlots

self.totalMembersInSlots += 1

if member.getExtendedAttribute("StoreInSlot"):

self._ownMembersInSlots += 1

if self.parent:

# Make sure we don't shadow any of the [Unforgeable] attributes on

# our ancestor interfaces. We don't have to worry about

# consequential interfaces here, because those have already been

# imported into the relevant .members lists. And we don't have to

# worry about anything other than our parent, because it has already

# imported its ancestors unforgeable attributes into its member

# list.

for unforgeableAttr in (attr for attr in self.parent.members if

attr.isAttr() and not attr.isStatic() and

attr.isUnforgeable()):

shadows = [ m for m in self.members if

(m.isAttr() or m.isMethod()) and

not m.isStatic() and

m.identifier.name == unforgeableAttr.identifier.name ]

if len(shadows) != 0:

locs = [unforgeableAttr.location] + [ s.location for s

in shadows ]

raise WebIDLError("Interface %s shadows [Unforgeable] "

"members of %s" %

(self.identifier.name,

ancestor.identifier.name),

locs)

# And now just stick it in our members, since we won't be

# inheriting this down the proto chain. If we really cared we

# could try to do something where we set up the unforgeable

# attributes of ancestor interfaces, with their corresponding

# getters, on our interface, but that gets pretty complicated

# and seems unnecessary.

self.members.append(unforgeableAttr)

# Ensure that there's at most one of each {named,indexed}

# {getter,setter,creator,deleter}, at most one stringifier,

# and at most one legacycaller. Note that this last is not

# quite per spec, but in practice no one overloads

# legacycallers.

specialMembersSeen = {}

for member in self.members:

if not member.isMethod():

continue

if member.isGetter():

memberType = "getters"

elif member.isSetter():

memberType = "setters"

elif member.isCreator():

memberType = "creators"

elif member.isDeleter():

memberType = "deleters"

elif member.isStringifier():

memberType = "stringifiers"

elif member.isJsonifier():

memberType = "jsonifiers"

elif member.isLegacycaller():

memberType = "legacycallers"

else:

continue

if (memberType != "stringifiers" and memberType != "legacycallers" and

memberType != "jsonifiers"):

if member.isNamed():

memberType = "named " + memberType

else:

assert member.isIndexed()

memberType = "indexed " + memberType

if memberType in specialMembersSeen:

raise WebIDLError("Multiple " + memberType + " on %s" % (self),

[self.location,

specialMembersSeen[memberType].location,

member.location])

specialMembersSeen[memberType] = member

if self._isOnGlobalProtoChain:

# Make sure we have no named setters, creators, or deleters

for memberType in ["setter", "creator", "deleter"]:

memberId = "named " + memberType + "s"

if memberId in specialMembersSeen:

raise WebIDLError("Interface with [Global] has a named %s" %

memberType,

[self.location,

specialMembersSeen[memberId].location])

# Make sure we're not [OverrideBuiltins]

if self.getExtendedAttribute("OverrideBuiltins"):

raise WebIDLError("Interface with [Global] also has "

"[OverrideBuiltins]",

[self.location])

# Mark all of our ancestors as being on the global's proto chain too

parent = self.parent

while parent:

# Must not inherit from an interface with [OverrideBuiltins]

if parent.getExtendedAttribute("OverrideBuiltins"):

raise WebIDLError("Interface with [Global] inherits from "

"interface with [OverrideBuiltins]",

[self.location, parent.location])

parent._isOnGlobalProtoChain = True

parent = parent.parent

def validate(self):

for member in self.members:

member.validate()

# Check that PutForwards refers to another attribute and that no

# cycles exist in forwarded assignments.

if member.isAttr():

iface = self

attr = member

putForwards = attr.getExtendedAttribute("PutForwards")

if putForwards and self.isCallback():

raise WebIDLError("[PutForwards] used on an attribute "

"on interface %s which is a callback "

"interface" % self.identifier.name,

[self.location, member.location])

while putForwards is not None:

forwardIface = attr.type.unroll().inner

fowardAttr = None

for forwardedMember in forwardIface.members:

if (not forwardedMember.isAttr() or

forwardedMember.identifier.name != putForwards[0]):

continue

if forwardedMember == member:

raise WebIDLError("Cycle detected in forwarded "

"assignments for attribute %s on "

"%s" %

(member.identifier.name, self),

[member.location])

fowardAttr = forwardedMember

break

if fowardAttr is None:

raise WebIDLError("Attribute %s on %s forwards to "

"missing attribute %s" %

(attr.identifier.name, iface, putForwards),

[attr.location])

iface = forwardIface

attr = fowardAttr

putForwards = attr.getExtendedAttribute("PutForwards")

def isInterface(self):

return True

def isExternal(self):

return False

def setIsConsequentialInterfaceOf(self, other):

self._consequential = True

self.interfacesBasedOnSelf.add(other)

def isConsequential(self):

return self._consequential

def setCallback(self, value):

self._callback = value

def isCallback(self):

return self._callback

def isSingleOperationInterface(self):

assert self.isCallback() or self.isJSImplemented()

return (

# JS-implemented things should never need the

# this-handling weirdness of single-operation interfaces.

not self.isJSImplemented() and

# Not inheriting from another interface

not self.parent and

# No consequential interfaces

len(self.getConsequentialInterfaces()) == 0 and

# No attributes of any kinds

not any(m.isAttr() for m in self.members) and

# There is at least one regular operation, and all regular

# operations have the same identifier

len(set(m.identifier.name for m in self.members if

m.isMethod() and not m.isStatic())) == 1)

def inheritanceDepth(self):

depth = 0

parent = self.parent

while parent:

depth = depth + 1

parent = parent.parent

return depth

def hasConstants(self):

return any(m.isConst() for m in self.members)

def hasInterfaceObject(self):

if self.isCallback():

return self.hasConstants()

return not hasattr(self, "_noInterfaceObject")

def hasInterfacePrototypeObject(self):

return not self.isCallback() and self.getUserData('hasConcreteDescendant', False)

def addExtendedAttributes(self, attrs):

self._extendedAttrDict = {}

for attr in attrs:

identifier = attr.identifier()

# Special cased attrs

if identifier == "TreatNonCallableAsNull":

raise WebIDLError("TreatNonCallableAsNull cannot be specified on interfaces",

[attr.location, self.location])

if identifier == "TreatNonObjectAsNull":

raise WebIDLError("TreatNonObjectAsNull cannot be specified on interfaces",

[attr.location, self.location])

elif identifier == "NoInterfaceObject":

if not attr.noArguments():

raise WebIDLError("[NoInterfaceObject] must take no arguments",

[attr.location])

if self.ctor():

raise WebIDLError("Constructor and NoInterfaceObject are incompatible",

[self.location])

self._noInterfaceObject = True

elif identifier == "Constructor" or identifier == "NamedConstructor" or identifier == "ChromeConstructor":

if identifier == "Constructor" and not self.hasInterfaceObject():

raise WebIDLError(str(identifier) + " and NoInterfaceObject are incompatible",

[self.location])

if identifier == "NamedConstructor" and not attr.hasValue():

raise WebIDLError("NamedConstructor must either take an identifier or take a named argument list",

[attr.location])

if identifier == "ChromeConstructor" and not self.hasInterfaceObject():

raise WebIDLError(str(identifier) + " and NoInterfaceObject are incompatible",

[self.location])

args = attr.args() if attr.hasArgs() else []

retType = IDLWrapperType(self.location, self)

if identifier == "Constructor" or identifier == "ChromeConstructor":

name = "constructor"

allowForbidden = True

else:

name = attr.value()

allowForbidden = False

methodIdentifier = IDLUnresolvedIdentifier(self.location, name,

allowForbidden=allowForbidden)

method = IDLMethod(self.location, methodIdentifier, retType,

args, static=True)

# Constructors are always NewObject and are always

# assumed to be able to throw (since there's no way to

# indicate otherwise) and never have any other

# extended attributes.

method.addExtendedAttributes(

[IDLExtendedAttribute(self.location, ("NewObject",)),

IDLExtendedAttribute(self.location, ("Throws",))])

if identifier == "ChromeConstructor":

method.addExtendedAttributes(

[IDLExtendedAttribute(self.location, ("ChromeOnly",))])

if identifier == "Constructor" or identifier == "ChromeConstructor":

method.resolve(self)

else:

# We need to detect conflicts for NamedConstructors across

# interfaces. We first call resolve on the parentScope,

# which will merge all NamedConstructors with the same

# identifier accross interfaces as overloads.

method.resolve(self.parentScope)

# Then we look up the identifier on the parentScope. If the

# result is the same as the method we're adding then it

# hasn't been added as an overload and it's the first time

# we've encountered a NamedConstructor with that identifier.

# If the result is not the same as the method we're adding

# then it has been added as an overload and we need to check

# whether the result is actually one of our existing

# NamedConstructors.

newMethod = self.parentScope.lookupIdentifier(method.identifier)

if newMethod == method:

self.namedConstructors.append(method)

elif newMethod not in self.namedConstructors:

raise WebIDLError("NamedConstructor conflicts with a NamedConstructor of a different interface",

[method.location, newMethod.location])

elif (identifier == "ArrayClass"):

if not attr.noArguments():

raise WebIDLError("[ArrayClass] must take no arguments",

[attr.location])

if self.parent:

raise WebIDLError("[ArrayClass] must not be specified on "

"an interface with inherited interfaces",

[attr.location, self.location])

elif identifier == "Global":

if not attr.noArguments():

raise WebIDLError("[Global] must take no arguments",

[attr.location])

self._isOnGlobalProtoChain = True

elif (identifier == "NeedNewResolve" or

identifier == "OverrideBuiltins" or

identifier == "NoDelete" or

identifier == "ChromeOnly"):

# Known extended attributes that do not take values

if not attr.noArguments():

raise WebIDLError("[%s] must take no arguments" % identifier,

[attr.location])

elif (identifier == "Pref" or

identifier == "JSImplementation" or

identifier == "HeaderFile" or

identifier == "NavigatorProperty" or

identifier == "AvailableIn" or

identifier == "Prefix" or

identifier == "Func"):

# Known extended attributes that take a string value

if not attr.hasValue():

raise WebIDLError("[%s] must have a value" % identifier,

[attr.location])

else:

raise WebIDLError("Unknown extended attribute %s on interface" % identifier,

[attr.location])

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emscripten/third_party/WebIDL.py at incoming · JavaScriptIOT/emscripten · GitHub

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