mirror of
https://github.com/mozilla/gecko-dev.git
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117 lines
3.2 KiB
C++
117 lines
3.2 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsJSUtils_h__
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#define nsJSUtils_h__
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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 "mozilla/Assertions.h"
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#include "nsISupports.h"
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#include "jsapi.h"
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#include "nsString.h"
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class nsIDOMEventListener;
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class nsIScriptContext;
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class nsIScriptGlobalObject;
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class nsIPrincipal;
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class nsJSUtils
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{
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public:
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static JSBool GetCallingLocation(JSContext* aContext, const char* *aFilename,
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PRUint32* aLineno);
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static nsIScriptGlobalObject *GetStaticScriptGlobal(JSContext* aContext,
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JSObject* aObj);
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static nsIScriptContext *GetStaticScriptContext(JSContext* aContext,
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JSObject* aObj);
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static nsIScriptGlobalObject *GetDynamicScriptGlobal(JSContext *aContext);
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static nsIScriptContext *GetDynamicScriptContext(JSContext *aContext);
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/**
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* Retrieve the inner window ID based on the given JSContext.
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*
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* @param JSContext aContext
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* The JSContext from which you want to find the inner window ID.
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*
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* @returns PRUint64 the inner window ID.
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*/
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static PRUint64 GetCurrentlyRunningCodeInnerWindowID(JSContext *aContext);
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};
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class nsDependentJSString : public nsDependentString
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{
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public:
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/**
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* In the case of string ids, getting the string's chars is infallible, so
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* the dependent string can be constructed directly.
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*/
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explicit nsDependentJSString(jsid id)
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: nsDependentString(JS_GetInternedStringChars(JSID_TO_STRING(id)),
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JS_GetStringLength(JSID_TO_STRING(id)))
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{
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}
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/**
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* Ditto for flat strings.
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*/
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explicit nsDependentJSString(JSFlatString* fstr)
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: nsDependentString(JS_GetFlatStringChars(fstr),
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JS_GetStringLength(JS_FORGET_STRING_FLATNESS(fstr)))
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{
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}
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/**
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* For all other strings, the nsDependentJSString object should be default
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* constructed, which leaves it empty (this->IsEmpty()), and initialized with
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* one of the init() methods below.
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*/
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nsDependentJSString()
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{
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}
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JSBool init(JSContext* aContext, JSString* str)
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{
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size_t length;
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const jschar* chars = JS_GetStringCharsZAndLength(aContext, str, &length);
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if (!chars)
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return JS_FALSE;
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NS_ASSERTION(IsEmpty(), "init() on initialized string");
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nsDependentString* base = this;
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new(base) nsDependentString(chars, length);
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return JS_TRUE;
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}
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JSBool init(JSContext* aContext, const jsval &v)
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{
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return init(aContext, JSVAL_TO_STRING(v));
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}
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void init(JSFlatString* fstr)
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{
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MOZ_ASSERT(IsEmpty(), "init() on initialized string");
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new(this) nsDependentJSString(fstr);
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}
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~nsDependentJSString()
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{
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}
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};
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#endif /* nsJSUtils_h__ */
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