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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
tree | f435a8308119effd964b339f76abb83a57c29483 /dom/streams/StreamUtils.h | |
parent | Initial commit. (diff) | |
download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | dom/streams/StreamUtils.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/dom/streams/StreamUtils.h b/dom/streams/StreamUtils.h new file mode 100644 index 0000000000..f0b09c63b8 --- /dev/null +++ b/dom/streams/StreamUtils.h @@ -0,0 +1,57 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef mozilla_dom_StreamUtils_h +#define mozilla_dom_StreamUtils_h + +#include "mozilla/ErrorResult.h" +#include "mozilla/dom/Promise.h" + +class nsIGlobalObject; + +namespace mozilla::dom { + +struct QueuingStrategy; + +double ExtractHighWaterMark(const QueuingStrategy& aStrategy, + double aDefaultHWM, ErrorResult& aRv); + +// Promisification algorithm, shared among: +// Step 2 and 3 of https://streams.spec.whatwg.org/#readablestream-set-up +// Step 2 and 3 of +// https://streams.spec.whatwg.org/#readablestream-set-up-with-byte-reading-support +// Step 2 and 3 of https://streams.spec.whatwg.org/#writablestream-set-up +// Step 5 and 6 of https://streams.spec.whatwg.org/#transformstream-set-up +template <typename T> +MOZ_CAN_RUN_SCRIPT static already_AddRefed<Promise> PromisifyAlgorithm( + nsIGlobalObject* aGlobal, T aFunc, mozilla::ErrorResult& aRv) { + // Step 1. Let result be the result of running (algorithm). If this throws an + // exception e, return a promise rejected with e. + RefPtr<Promise> result; + if constexpr (!std::is_same<decltype(aFunc(aRv)), void>::value) { + result = aFunc(aRv); + } else { + aFunc(aRv); + } + + if (aRv.IsUncatchableException()) { + return nullptr; + } + + if (aRv.Failed()) { + return Promise::CreateRejectedWithErrorResult(aGlobal, aRv); + } + + // Step 2. If result is a Promise, then return result. + if (result) { + return result.forget(); + } + + // Step 3. Return a promise resolved with undefined. + return Promise::CreateResolvedWithUndefined(aGlobal, aRv); +} + +} // namespace mozilla::dom + +#endif // mozilla_dom_StreamUtils_h |