mirror of
https://github.com/mozilla/gecko-dev.git
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145 lines
4.4 KiB
C++
145 lines
4.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
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/* 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_DOMJSProxyHandler_h
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#define mozilla_dom_DOMJSProxyHandler_h
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#include "mozilla/Attributes.h"
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#include "mozilla/Likely.h"
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#include "jsapi.h"
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#include "jsfriendapi.h"
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#include "jsproxy.h"
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#include "xpcpublic.h"
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#include "nsStringGlue.h"
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#define DOM_PROXY_OBJECT_SLOT js::PROXY_PRIVATE_SLOT
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namespace mozilla {
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namespace dom {
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enum {
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JSPROXYSLOT_EXPANDO = 0,
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JSPROXYSLOT_XRAY_EXPANDO
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};
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template<typename T> struct Prefable;
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class DOMProxyHandler : public js::BaseProxyHandler
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{
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public:
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DOMProxyHandler(const DOMClass& aClass)
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: js::BaseProxyHandler(ProxyFamily()),
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mClass(aClass)
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{
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}
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bool preventExtensions(JSContext *cx, JS::Handle<JSObject*> proxy) MOZ_OVERRIDE;
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bool getPropertyDescriptor(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id,
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JSPropertyDescriptor* desc, unsigned flags) MOZ_OVERRIDE;
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bool defineProperty(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id,
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JSPropertyDescriptor* desc) MOZ_OVERRIDE
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{
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bool unused;
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return defineProperty(cx, proxy, id, desc, &unused);
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}
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virtual bool defineProperty(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id,
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JSPropertyDescriptor* desc, bool* defined);
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bool delete_(JSContext* cx, JS::Handle<JSObject*> proxy,
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JS::Handle<jsid> id, bool* bp) MOZ_OVERRIDE;
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bool enumerate(JSContext* cx, JS::Handle<JSObject*> proxy, JS::AutoIdVector& props) MOZ_OVERRIDE;
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bool has(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id, bool* bp) MOZ_OVERRIDE;
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bool isExtensible(JSContext *cx, JS::Handle<JSObject*> proxy, bool *extensible) MOZ_OVERRIDE;
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static JSObject* GetExpandoObject(JSObject* obj)
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{
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MOZ_ASSERT(IsDOMProxy(obj), "expected a DOM proxy object");
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JS::Value v = js::GetProxyExtra(obj, JSPROXYSLOT_EXPANDO);
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if (v.isObject()) {
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return &v.toObject();
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}
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if (v.isUndefined()) {
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return nullptr;
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}
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js::ExpandoAndGeneration* expandoAndGeneration =
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static_cast<js::ExpandoAndGeneration*>(v.toPrivate());
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v = expandoAndGeneration->expando;
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return v.isUndefined() ? nullptr : &v.toObject();
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}
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/* GetAndClearExpandoObject does not DROP or clear the preserving wrapper flag. */
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static JSObject* GetAndClearExpandoObject(JSObject* obj);
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static JSObject* EnsureExpandoObject(JSContext* cx,
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JS::Handle<JSObject*> obj);
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const DOMClass& mClass;
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protected:
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// Append the property names in "names" to "props". If
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// shadowPrototypeProperties is false then skip properties that are also
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// present on our proto chain.
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bool AppendNamedPropertyIds(JSContext* cx, JS::Handle<JSObject*> proxy,
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nsTArray<nsString>& names,
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bool shadowPrototypeProperties,
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JS::AutoIdVector& props);
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};
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extern jsid s_length_id;
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int32_t IdToInt32(JSContext* cx, JS::Handle<jsid> id);
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// XXXbz this should really return uint32_t, with the maximum value
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// meaning "not an index"...
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inline int32_t
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GetArrayIndexFromId(JSContext* cx, JS::Handle<jsid> id)
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{
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if (MOZ_LIKELY(JSID_IS_INT(id))) {
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return JSID_TO_INT(id);
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}
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if (MOZ_LIKELY(id == s_length_id)) {
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return -1;
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}
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if (MOZ_LIKELY(JSID_IS_ATOM(id))) {
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JSAtom* atom = JSID_TO_ATOM(id);
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jschar s = *js::GetAtomChars(atom);
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if (MOZ_LIKELY((unsigned)s >= 'a' && (unsigned)s <= 'z'))
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return -1;
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uint32_t i;
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JSLinearString* str = js::AtomToLinearString(JSID_TO_ATOM(id));
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return js::StringIsArrayIndex(str, &i) ? i : -1;
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}
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return IdToInt32(cx, id);
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}
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inline bool
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IsArrayIndex(int32_t index)
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{
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return index >= 0;
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}
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inline void
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FillPropertyDescriptor(JSPropertyDescriptor* desc, JSObject* obj, bool readonly)
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{
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desc->obj = obj;
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desc->attrs = (readonly ? JSPROP_READONLY : 0) | JSPROP_ENUMERATE;
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desc->getter = NULL;
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desc->setter = NULL;
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desc->shortid = 0;
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}
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inline void
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FillPropertyDescriptor(JSPropertyDescriptor* desc, JSObject* obj, JS::Value v, bool readonly)
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{
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desc->value = v;
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FillPropertyDescriptor(desc, obj, readonly);
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}
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} // namespace dom
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} // namespace mozilla
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#endif /* mozilla_dom_DOMProxyHandler_h */
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