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3e8d266e8a
This helper makes it considerably easier for C++ code to import a JS module
and wrap it in an appropriately-defined XPIDL interface for its exports.
Typical usage is something like:
Foo.jsm:
var EXPORTED_SYMBOLS = ["foo"];
function foo(bar) {
return bar.toString();
}
mozIFoo.idl:
interface mozIFoo : nsISupports {
AString foo(double meh);
}
Thing.cpp:
nsCOMPtr<mozIFoo> foo = do_ImportModule(
"resource://meh/Foo.jsm");
MOZ_TRY(foo->Foo(42));
Differential Revision: https://phabricator.services.mozilla.com/D14209
--HG--
extra : rebase_source : 4d518205b173fc210908235b42ddace590e6b7e5
77 lines
1.9 KiB
C++
77 lines
1.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 nsImportModule_h
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#define nsImportModule_h
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#include "mozilla/Attributes.h"
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#include "nsCOMPtr.h"
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#include "mozilla/RefPtr.h"
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namespace mozilla {
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namespace loader {
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nsresult ImportModule(const char* aURI, const nsIID& aIID, void** aResult);
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} // namespace loader
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} // namespace mozilla
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class MOZ_STACK_CLASS nsImportModule final : public nsCOMPtr_helper {
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public:
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nsImportModule(const char* aURI, nsresult* aErrorPtr)
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: mURI(aURI), mErrorPtr(aErrorPtr) {}
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virtual nsresult NS_FASTCALL operator()(const nsIID& aIID,
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void** aResult) const override {
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nsresult rv = ::mozilla::loader::ImportModule(mURI, aIID, aResult);
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if (mErrorPtr) {
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*mErrorPtr = rv;
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}
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return rv;
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}
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private:
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const char* mURI;
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nsresult* mErrorPtr;
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};
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/**
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* These helpers make it considerably easier for C++ code to import a JS module
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* and wrap it in an appropriately-defined XPIDL interface for its exports.
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* Typical usage is something like:
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*
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* Foo.jsm:
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*
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* var EXPORTED_SYMBOLS = ["foo"];
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*
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* function foo(bar) {
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* return bar.toString();
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* }
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*
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* mozIFoo.idl:
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*
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* interface mozIFoo : nsISupports {
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* AString foo(double meh);
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* }
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*
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* Thing.cpp:
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*
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* nsCOMPtr<mozIFoo> foo = do_ImportModule(
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* "resource://meh/Foo.jsm");
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*
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* MOZ_TRY(foo->Foo(42));
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*/
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inline nsImportModule do_ImportModule(const char* aURI) {
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return {aURI, nullptr};
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}
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inline nsImportModule do_ImportModule(const char* aURI, nsresult* aRv) {
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return {aURI, aRv};
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}
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#endif // defined nsImportModule_h
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