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46 lines
1.6 KiB
C++
46 lines
1.6 KiB
C++
/* 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 nsDOMJSUtils_h__
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#define nsDOMJSUtils_h__
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#include "jsapi.h"
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#include "nsIScriptContext.h"
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class nsIJSArgArray;
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// seems like overkill for just this 1 function - but let's see what else
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// falls out first.
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inline nsIScriptContext *
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GetScriptContextFromJSContext(JSContext *cx)
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{
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if (!(::JS_GetOptions(cx) & JSOPTION_PRIVATE_IS_NSISUPPORTS)) {
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return nullptr;
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}
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nsCOMPtr<nsIScriptContext> scx =
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do_QueryInterface(static_cast<nsISupports *>
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(::JS_GetContextPrivate(cx)));
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// This will return a pointer to something that's about to be
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// released, but that's ok here.
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return scx;
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}
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// A factory function for turning a JS::Value argv into an nsIArray
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// but also supports an effecient way of extracting the original argv.
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// Bug 312003 describes why this must be "void *", but argv will be cast to
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// JS::Value* and the args are found at:
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// ((JS::Value*)aArgv)[0], ..., ((JS::Value*)aArgv)[aArgc - 1]
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// The resulting object will take a copy of the array, and ensure each
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// element is rooted.
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// Optionally, aArgv may be NULL, in which case the array is allocated and
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// rooted, but all items remain NULL. This presumably means the caller will
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// then QI us for nsIJSArgArray, and set our array elements.
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nsresult NS_CreateJSArgv(JSContext *aContext, uint32_t aArgc, void *aArgv,
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nsIJSArgArray **aArray);
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#endif // nsDOMJSUtils_h__
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