зеркало из https://github.com/mozilla/pjs.git
209 строки
6.5 KiB
C++
209 строки
6.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=2 sw=2 et tw=78: */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Vidur Apparao <vidur@netscape.com>
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* L. David Baron <dbaron@mozillafoundation.org>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/**
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* This is not a generated file. It contains common utility functions
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* invoked from the JavaScript code generated from IDL interfaces.
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* The goal of the utility functions is to cut down on the size of
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* the generated code itself.
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*/
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#include "nsJSUtils.h"
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#include "jsapi.h"
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#include "jsdbgapi.h"
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#include "prprf.h"
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#include "nsIScriptContext.h"
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#include "nsIScriptObjectOwner.h"
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#include "nsIScriptGlobalObject.h"
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#include "nsIServiceManager.h"
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#include "nsIXPConnect.h"
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#include "nsCOMPtr.h"
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#include "nsContentUtils.h"
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#include "nsIScriptSecurityManager.h"
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#include "nsDOMJSUtils.h" // for GetScriptContextFromJSContext
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JSBool
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nsJSUtils::GetCallingLocation(JSContext* aContext, const char* *aFilename,
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PRUint32* aLineno, nsIPrincipal* aPrincipal)
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{
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// Get the current filename and line number
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JSStackFrame* frame = nsnull;
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JSScript* script = nsnull;
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do {
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frame = ::JS_FrameIterator(aContext, &frame);
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if (frame) {
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script = ::JS_GetFrameScript(aContext, frame);
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}
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} while (frame && !script);
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if (script) {
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// If aPrincipals is non-null then our caller is asking us to ensure
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// that the filename we return does not have elevated privileges.
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if (aPrincipal) {
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uint32 flags = JS_GetScriptFilenameFlags(script);
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// Use the principal for the filename if it shouldn't be receiving
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// implicit XPCNativeWrappers.
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PRBool system;
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if (flags & JSFILENAME_PROTECTED) {
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nsIScriptSecurityManager *ssm = nsContentUtils::GetSecurityManager();
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if (NS_FAILED(ssm->IsSystemPrincipal(aPrincipal, &system)) || !system) {
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JSPrincipals* jsprins;
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aPrincipal->GetJSPrincipals(aContext, &jsprins);
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*aFilename = jsprins->codebase;
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*aLineno = 0;
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JSPRINCIPALS_DROP(aContext, jsprins);
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return JS_TRUE;
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}
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}
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}
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const char* filename = ::JS_GetScriptFilename(aContext, script);
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if (filename) {
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PRUint32 lineno = 0;
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jsbytecode* bytecode = ::JS_GetFramePC(aContext, frame);
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if (bytecode) {
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lineno = ::JS_PCToLineNumber(aContext, script, bytecode);
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}
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*aFilename = filename;
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*aLineno = lineno;
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return JS_TRUE;
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}
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}
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return JS_FALSE;
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}
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nsIScriptGlobalObject *
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nsJSUtils::GetStaticScriptGlobal(JSContext* aContext, JSObject* aObj)
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{
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nsISupports* supports;
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JSClass* clazz;
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JSObject* parent;
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JSObject* glob = aObj; // starting point for search
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if (!glob)
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return nsnull;
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while ((parent = ::JS_GetParent(aContext, glob)))
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glob = parent;
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clazz = JS_GET_CLASS(aContext, glob);
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if (!clazz ||
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!(clazz->flags & JSCLASS_HAS_PRIVATE) ||
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!(clazz->flags & JSCLASS_PRIVATE_IS_NSISUPPORTS) ||
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!(supports = (nsISupports*)::JS_GetPrivate(aContext, glob))) {
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return nsnull;
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}
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// We might either have a window directly (e.g. if the global is a
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// sandbox whose script object principal pointer is a window), or an
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// XPCWrappedNative for a window. We could also have other
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// sandbox-related script object principals, but we can't do much
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// about those short of trying to walk the proto chain of |glob|
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// looking for a window or something.
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nsCOMPtr<nsIScriptGlobalObject> sgo(do_QueryInterface(supports));
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if (!sgo) {
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nsCOMPtr<nsIXPConnectWrappedNative> wrapper(do_QueryInterface(supports));
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NS_ENSURE_TRUE(wrapper, nsnull);
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sgo = do_QueryWrappedNative(wrapper);
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}
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// We're returning a pointer to something that's about to be
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// released, but that's ok here.
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return sgo;
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}
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nsIScriptContext *
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nsJSUtils::GetStaticScriptContext(JSContext* aContext, JSObject* aObj)
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{
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nsIScriptGlobalObject *nativeGlobal = GetStaticScriptGlobal(aContext, aObj);
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if (!nativeGlobal)
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return nsnull;
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return nativeGlobal->GetScriptContext(nsIProgrammingLanguage::JAVASCRIPT);
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}
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nsIScriptGlobalObject *
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nsJSUtils::GetDynamicScriptGlobal(JSContext* aContext)
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{
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nsIScriptContext *scriptCX = GetDynamicScriptContext(aContext);
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if (!scriptCX)
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return nsnull;
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return scriptCX->GetGlobalObject();
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}
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nsIScriptContext *
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nsJSUtils::GetDynamicScriptContext(JSContext *aContext)
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{
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return GetScriptContextFromJSContext(aContext);
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}
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PRUint64
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nsJSUtils::GetCurrentlyRunningCodeWindowID(JSContext *aContext)
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{
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if (!aContext)
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return 0;
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PRUint64 windowID = 0;
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JSObject *jsGlobal = JS_GetGlobalForScopeChain(aContext);
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if (jsGlobal) {
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nsIScriptGlobalObject *scriptGlobal = GetStaticScriptGlobal(aContext,
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jsGlobal);
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if (scriptGlobal) {
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nsCOMPtr<nsPIDOMWindow> win = do_QueryInterface(scriptGlobal);
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if (win)
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windowID = win->GetOuterWindow()->WindowID();
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}
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}
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return windowID;
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}
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