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https://gitlab.winehq.org/wine/wine-gecko.git
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500 lines
22 KiB
Python
500 lines
22 KiB
Python
# This is vaguely related to an nsIScriptContext. The pydom C code
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# just calls back into this class - but that C code still retains some of the
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# functionality.
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import sys, types, new, logging
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import domcompile
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from xpcom.client import Component
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from xpcom import components, primitives, COMException, nsError, _xpcom
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import _nsdom
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GlobalWindowIIDs = [_nsdom.IID_nsIScriptGlobalObject,
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components.interfaces.nsIDOMWindow]
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IID_nsIDOMXULElement = components.interfaces.nsIDOMXULElement
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# Borrow the xpcom logger (but use a new sub-logger)
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logger = logging.getLogger("xpcom.nsdom")
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# Note that many calls to logger.debug are prefixed with if __debug__.
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# This is to prevent *any* penalty in non-debug mode for logging in perf
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# critical areas.
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# Also note that assert statements have no cost in non-debug builds.
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# XUL Elements don't expose the XBL implemented interfaces via classinfo.
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# So we cheat :)
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# Most support nsIAccessibleProvider - don't list that!
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# Although this sucks for now, if you strike something that isn't listed,
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# then simply QI the object you have for the interface you need to use. To
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# avoid the explicit QI, you could also have your code do:
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# import nsdom.context
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# xei = nsdom.context.xul_element_interfaces
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# # flag for manual inspection should a future version include it
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# if 'somewidget' in xei: raise RuntimeError, "already here!?"
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# xei['somewidget'] = [...]
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xul_element_interfaces = {
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# tagName: [IID, ...]
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'textbox': [components.interfaces.nsIDOMXULTextBoxElement],
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'button': [components.interfaces.nsIDOMXULButtonElement],
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'checkbox': [components.interfaces.nsIDOMXULCheckboxElement],
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'image': [components.interfaces.nsIDOMXULImageElement],
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'tree': [components.interfaces.nsIDOMXULTreeElement,
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components.interfaces.nsIDOMXULMultiSelectControlElement],
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'listbox': [components.interfaces.nsIDOMXULMultiSelectControlElement],
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'menu': [components.interfaces.nsIDOMXULSelectControlItemElement],
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'popup': [components.interfaces.nsIDOMXULPopupElement],
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'radiogroup': [components.interfaces.nsIDOMXULSelectControlElement],
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}
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def dump(fmt, *args):
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"""A global 'dump' function, available in global namespaces. Similar to
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The JS version, but this supports % message formatting.
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Main advantage over 'print' is that it catches the possible IO error
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when there is no available console.
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"""
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try:
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sys.stderr.write(fmt % args)
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sys.stderr.write("\n")
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except IOError:
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pass
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# The event listener class we attach to an object for addEventListener
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class EventListener:
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_com_interfaces_ = components.interfaces.nsIDOMEventListener
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def __init__(self, context, evt_name, handler, globs):
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# 'globs' are the globals the event handler will use, or None
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# if the handler should use the globals it was compiled with.
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self.context = context
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if callable(handler):
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self.func = handler
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else:
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# event name for addEventListener has no 'on' prefix
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func_name = "on" + evt_name
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# What to do about arg names? It looks like onerror
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# still only gets one arg here anyway - handleEvent only takes
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# one!
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arg_names = ('event',)
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co = domcompile.compile_function(handler,
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"inline event '%s'" % evt_name,
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func_name,
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arg_names)
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# Could use globs here, but should not be necessary - all we
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# are doing is getting the function object from it.
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g = {}
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exec co in g
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self.func = g[func_name]
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self.globals = globs
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def handleEvent(self, event):
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# Although handler is already a function object, we must re-bind to
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# new globals if necessary.
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if self.globals is not None:
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f = new.function(self.func.func_code, self.globals,
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self.func.func_name, self.func.func_closure)
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else:
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f = self.func
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# Convert the raw pyxpcom object to a magic _nsdom one, that
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# knows how to remember expandos etc based on context (ie, winds
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# up calling back into MakeInterfaceResult().
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event = _nsdom.MakeDOMObject(self.context, event)
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args = (event,)
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# We support having less args declared than supplied, a-la JS.
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# (This can only happen when passed a function object - we always
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# compile a string handler into a function with 1 arg)
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args = args[:f.func_code.co_argcount]
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return f(*args)
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class WrappedNative(Component):
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"""Implements the xpconnect concept of 'wrapped natives' and 'expandos'.
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DOM objects can have arbitrary values set on them. Once this is done for
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the first time, it gets stored in a map in the context. This leads to
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cycles, which must be cleaned up when the context is closed.
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"""
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def __init__(self, context, obj, iid):
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# Store our context - but our context doesn't keep a reference
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# to us until someone calls self._remember_object() on the context -
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# which sets up all kinds of cycles!
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self.__dict__['_context_'] = context
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# We store expandos in a separate dict rather than directly in our
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# __dict__. No real need for this other than to prevent these
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# attributes clobbering ones we need to work!
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self.__dict__['_expandos_'] = {}
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Component.__init__(self, obj, iid)
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def __repr__(self):
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iface_desc = self._get_classinfo_repr_()
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return "<DOM object '%s' (%s)>" % (self._object_name_,iface_desc)
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def __getattr__(self, attr):
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# If it exists in expandos, always return it.
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if attr.startswith("__"):
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raise AttributeError, attr
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# expandos come before interface attributes (which may be wrong. If
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# we do this, why not just store it in __dict__?)
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expandos = self._expandos_
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if expandos.has_key(attr):
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return expandos[attr]
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return Component.__getattr__(self, attr)
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def __setattr__(self, attr, value):
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try:
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Component.__setattr__(self, attr, value)
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except AttributeError:
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# Set it as an 'expando'. It looks like we should delegate *all*
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# to the outside object.
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logger.debug("setting expando %s.%r=%r for object %r",
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self, attr, value, self._comobj_)
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# and register if an event.
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if attr.startswith("on"):
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# I'm quite confused by this :(
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target = self._comobj_
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if _nsdom.IsOuterWindow(target):
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target = _nsdom.GetCurrentInnerWindow(target)
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go = self._context_.globalObject
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scope = self._context_.GetNativeGlobal()
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if callable(value):
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# no idea if this is right - set the compiled object ourselves.
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self._expandos_[attr] = value
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_nsdom.RegisterScriptEventListener(go, scope, target, attr)
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else:
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_nsdom.AddScriptEventListener(target, attr, value, False, False)
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_nsdom.CompileScriptEventListener(go, scope, target, attr)
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else:
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self._expandos_[attr] = value
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self._context_._remember_object(self)
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def _build_all_supported_interfaces_(self):
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# Generally called as pyxpcom is finding an attribute, overridden to
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# work around lack of class info for xbl bindings.
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Component._build_all_supported_interfaces_(self)
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# Now hard-code certain element names we know about, as the XBL
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# implemented interfaces are not exposed by this.
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ii = self.__dict__['_interface_infos_']
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if ii.has_key(IID_nsIDOMXULElement):
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# Is a DOM element - see if in our map.
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tagName = self.tagName
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interfaces = xul_element_interfaces.get(tagName, [])
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for interface in interfaces:
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if not ii.has_key(interface):
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self._remember_interface_info(interface)
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else:
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logger.info("Not a DOM element - not hooking extra interfaces")
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def addEventListener(self, event, handler, useCapture=False, globs=None):
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# We need to transform string or function objects into
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# nsIDOMEventListener interfaces.
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logger.debug("addEventListener for %r, event=%r, handler=%r, cap=%s",
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self, event, handler, useCapture)
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if not hasattr(handler, "handleEvent"): # may already be a handler instance.
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# Wrap it in our instance, which knows how to convert strings and
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# function objects.
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# Handle semantics for event handler globals:
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# * If a function, then function globals are used, as per normal.
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# * If a string object and no explicit globals param, use the
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# caller's globals
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if globs is None and not callable(handler):
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globs = sys._getframe().f_back.f_globals
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handler = EventListener(self._context_, event, handler, globs)
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else:
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assert not globs, "can't specify a handler instance and globals"
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base = self.__getattr__('addEventListener')
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base(event, handler, useCapture)
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class WrappedNativeGlobal(WrappedNative):
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# Special support for our global object. Certain methods exposed by
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# IDL are JS specific - generally ones that take a variable number of args,
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# a concept that doesn't exist in xpcom.
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def __repr__(self):
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iface_desc = self._get_classinfo_repr_()
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outer = _nsdom.IsOuterWindow(self._comobj_)
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return "<GlobalWindow outer=%s %s>" % (outer, iface_desc)
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# Open window/dialog
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def openDialog(self, url, name, features="", *args):
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svc = components.classes['@mozilla.org/embedcomp/window-watcher;1'] \
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.getService(components.interfaces.nsIWindowWatcher)
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# Wrap in an nsIArray with special support for Python being able to
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# access the raw objects if the call-site is smart enough
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args = _nsdom.MakeArray(args)
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ret = svc.openWindow(self._comobj_, url, name, features, args)
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# and re-wrap in one of our "dom" objects
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return _nsdom.MakeDOMObject(self._context_, ret)
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# window.open and window.openDialog seem identical except for *args???
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open = openDialog
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# Timeout related functions.
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def setTimeout(self, interval, handler, *args):
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return _nsdom.SetTimeoutOrInterval(self._comobj_, interval, handler,
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args, False)
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# setInterval appears to have reversed args???
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def setInterval(self, handler, interval, *args):
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return _nsdom.SetTimeoutOrInterval(self._comobj_, interval, handler,
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args, True)
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def clearTimeout(self, tid):
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return _nsdom.ClearTimeoutOrInterval(self._comobj_, tid)
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def clearInterval(self, tid):
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return _nsdom.ClearTimeoutOrInterval(self._comobj_, tid)
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# Our "script context" - morally an nsIScriptContext, although that lives
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# in our C++ code and delegates to this.
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class ScriptContext:
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def __init__(self):
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self.globalNamespace = {} # must not change identity!
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self._remembered_objects_ = {} # could, but doesn't
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self._reset()
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def _reset(self):
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# Explicitly wipe all 'expandos' for our remembered objects.
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# Its not clear this is necessary, but it is easy to envisage someone
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# setting up a cycle via expandos.
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for ro in self._remembered_objects_.itervalues():
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ro._expandos_.clear()
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self._remembered_objects_.clear()
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# self.globalObject is the "outer window" global, whereas the
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# inner window global tends to be passed in to each function as the
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# 'scope' object.
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self.globalObject = None
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self.globalNamespace.clear()
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def __repr__(self):
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return "<ScriptContext at %d>" % id(self)
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# Called by the _nsdom C++ support to wrap the DOM objects.
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def MakeInterfaceResult(self, object, iid):
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if 0 and __debug__: # this is a little noisy...
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logger.debug("MakeInterfaceResult for %r (remembered=%s)",
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object,
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self._remembered_objects_.has_key(object))
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assert not hasattr(object, "_comobj_"), "should not be wrapped!"
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# If it is remembered, just return that object.
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try:
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return self._remembered_objects_[object]
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except KeyError:
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# Make a new wrapper - but don't remember the wrapper until
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# we need to, when a property is set on it.
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# We should probably QI for nsIClassInfo, and only do this special
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# wrapping for objects with the DOM flag set.
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if iid in GlobalWindowIIDs:
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klass = WrappedNativeGlobal
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else:
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klass = WrappedNative
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return klass(self, object, iid)
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# Called whenever this object must be "permanently" attached to the
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# context. Typically this means an attribute or event handler
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# has been set on the object, which should "persist" while the context
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# is alive (ie, future requests to getElementById(), for example, must
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# return the same underlying object, with event handlers and properties
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# still in-place.
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def _remember_object(self, object):
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# You must only try and remember a wrapped object.
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# Once an object has been wrapped once, all further requests must
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# be identical
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assert self._remembered_objects_.get(object._comobj_, object)==object, \
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"Previously remembered object is not this object!"
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self._remembered_objects_[object._comobj_] = object
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if __debug__:
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logger.debug("%s remembering object %r - now %d items", self,
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object, len(self._remembered_objects_))
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def _fixArg(self, arg):
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if arg is None:
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return []
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# Already a tuple? This means the original Python args have been
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# found and passed directly.
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if type(arg) == types.TupleType:
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return arg
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try:
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argv = arg.QueryInterface(components.interfaces.nsIArray)
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except COMException, why:
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if why.errno != nsError.NS_NOINTERFACE:
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raise
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# This is not an array - see if it is a variant or primitive.
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try:
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var = arg.queryInterface(components.interfaces.nsIVariant)
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parent = None
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if self.globalObject is not None:
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parent = self.globalObject._comobj_
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if parent is None:
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logger.warning("_fixArg for context with no global??")
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return _xpcom.GetVariantValue(var, parent)
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except COMException, why:
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if why.errno != nsError.NS_NOINTERFACE:
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raise
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try:
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return primitives.GetPrimitive(arg)
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except COMException, why:
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if why.errno != nsError.NS_NOINTERFACE:
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raise
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return arg
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# Its an array - do each item
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ret = []
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for i in range(argv.length):
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val = argv.queryElementAt(i, components.interfaces.nsISupports)
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ret.append(self._fixArg(val))
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return ret
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def GetNativeGlobal(self):
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return self.globalNamespace
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def CreateNativeGlobalForInner(self, globalObject, isChrome):
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ret = dict()
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if __debug__:
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logger.debug("%r CreateNativeGlobalForInner returning %d",
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self, id(ret))
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return ret
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def ConnectToInner(self, newInner, globalScope, innerScope):
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if __debug__:
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logger.debug("%r ConnectToInner(%r, %d, %d)",
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self, newInner, id(globalScope), id(innerScope))
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globalScope['_inner_'] = innerScope # will do for now.
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self._prepareGlobalNamespace(newInner, innerScope)
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def WillInitializeContext(self):
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if __debug__:
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logger.debug("%r WillInitializeContent", self)
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def DidInitializeContext(self):
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if __debug__:
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logger.debug("%r DidInitializeContent", self)
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def DidSetDocument(self, doc, scope):
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if __debug__:
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logger.debug("%r DidSetDocument doc=%r scope=%d",
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self, doc, id(scope))
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scope['document'] = doc
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def _prepareGlobalNamespace(self, globalObject, globalNamespace):
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assert isinstance(globalObject, WrappedNativeGlobal), \
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"Our global should have been wrapped in WrappedNativeGlobal"
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if __debug__:
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logger.debug("%r initializing (outer=%s), ns=%d", self,
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_nsdom.IsOuterWindow(globalObject),
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id(globalNamespace))
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assert len(globalObject._expandos_)==0, \
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"already initialized this global?"
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ns = globalObject.__dict__['_expandos_'] = globalNamespace
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self._remember_object(globalObject)
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ns['window'] = globalObject
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# we can't fetch 'document' and stash it now - there may not be one
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# at this instant (ie, it may be in the process of being attached)
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# Poke some other utilities etc into the namespace.
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ns['dump'] = dump
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def InitContext(self, globalObject):
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self._reset()
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self.globalObject = globalObject
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if globalObject is None:
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logger.debug("%r initializing with NULL global, ns=%d", self,
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id(self.globalNamespace))
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else:
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self._prepareGlobalNamespace(globalObject, self.globalNamespace)
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def FinalizeClasses(self, globalObject):
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self._reset()
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def ClearScope(self, globalObject):
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if __debug__:
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logger.debug("%s.ClearScope (%d)", self, id(globalObject))
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globalObject.clear()
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def FinalizeContext(self):
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if __debug__:
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logger.debug("%s.FinalizeContext", self)
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self._reset()
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def EvaluateString(self, script, glob, principal, url, lineno, ver):
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# This appears misnamed - return value it not used. Therefore we can
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# just do a simple 'exec'. If we needed a return value, we would have
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# to treat this like a string event-handler, and compile as a temp
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# function.
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assert type(glob) == types.DictType
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# compile then exec to make use of lineno
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co = domcompile.compile(script, url, lineno=lineno-1)
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exec co in glob
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def ExecuteScript(self, scriptObject, scopeObject):
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if __debug__:
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logger.debug("%s.ExecuteScript %r in scope %s",
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self, scriptObject, id(scopeObject))
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if scopeObject is None:
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scopeObject = self.GetNativeGlobal()
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assert type(scriptObject) == types.CodeType, \
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"Script object should be a code object (got %r)" % (scriptObject,)
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exec scriptObject in scopeObject
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def CompileScript(self, text, scopeObject, principal, url, lineno, version):
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# The line number passed is the first; offset is -1
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return domcompile.compile(text, url, lineno=lineno-1)
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def CompileEventHandler(self, name, argNames, body, url, lineno):
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if __debug__:
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logger.debug("%s.CompileEventHandler %s %s:%s ('%s')",
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self, name, url, lineno, body[:100])
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co = domcompile.compile_function(body, url, name, argNames,
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lineno=lineno-1)
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g = {}
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exec co in g
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handler = g[name]
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# Flag that this function started life as inline script code,
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# so we later ensure the correct globals are used when the event fires
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handler._nsdom_compiled = True
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return g[name]
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def CallEventHandler(self, target, scope, handler, argv):
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if __debug__:
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logger.debug("CallEventHandler %r on target %s in scope %s",
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handler, target, id(scope))
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# Event handlers must fire in their real globals (not a copy) so
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# it can set global vars!
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# If this was an inline event handler, re-bind to the window's globals.
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if hasattr(handler, '_nsdom_compiled'):
|
|
globs = scope
|
|
# re-bind to new globals
|
|
f = new.function(handler.func_code, globs, handler.func_name,
|
|
handler.func_defaults)
|
|
handler = f
|
|
args = tuple(self._fixArg(argv))
|
|
# We support having less args declared than supplied, a-la JS.
|
|
args = args[:handler.func_code.co_argcount]
|
|
return handler(*args)
|
|
|
|
def BindCompiledEventHandler(self, target, scope, name, handler):
|
|
if __debug__:
|
|
logger.debug("%s.BindCompiledEventHandler (%s=%r) on target %s in scope %s",
|
|
self, name, handler, target, id(scope))
|
|
# Keeps a ref to both the target and handler.
|
|
self._remember_object(target)
|
|
ns = target._expandos_
|
|
ns[name] = handler
|
|
|
|
def GetBoundEventHandler(self, target, scope, name):
|
|
if __debug__:
|
|
logger.debug("%s.GetBoundEventHandler for '%s' on target %s in scope %s",
|
|
self, name, target, id(scope))
|
|
ns = target._expandos_
|
|
return ns[name]
|
|
|
|
def SetProperty(self, target, name, value):
|
|
if __debug__:
|
|
logger.debug("%s.SetProperty for %s=%r", self, name, value)
|
|
target[name] = self._fixArg(value)
|