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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* 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/. */
/* Queue-with-sizes operations. */
#ifndef builtin_streams_QueueWithSizes_inl_h
#define builtin_streams_QueueWithSizes_inl_h
#include "builtin/streams/QueueWithSizes.h"
#include "mozilla/Assertions.h" // MOZ_ASSERT
#include "js/RootingAPI.h" // JS::Handle
#include "js/Value.h" // JS::Value
#include "vm/List.h" // js::ListObject
#include "vm/List-inl.h" // js::ListObject::*
struct JS_PUBLIC_API JSContext;
namespace js {
namespace detail {
// The *internal* representation of a queue-with-sizes is a List of even length
// where elements (2 * n, 2 * n + 1) represent the nth (value, size) element in
// the queue.
inline JS::Value QueueFirstValue(ListObject* unwrappedQueue) {
MOZ_ASSERT(!unwrappedQueue->isEmpty(),
"can't examine first value in an empty queue-with-sizes");
MOZ_ASSERT((unwrappedQueue->length() % 2) == 0,
"queue-with-sizes must consist of (value, size) element pairs and "
"so must have even length");
return unwrappedQueue->get(0);
}
inline double QueueFirstSize(ListObject* unwrappedQueue) {
MOZ_ASSERT(!unwrappedQueue->isEmpty(),
"can't examine first value in an empty queue-with-sizes");
MOZ_ASSERT((unwrappedQueue->length() % 2) == 0,
"queue-with-sizes must consist of (value, size) element pairs and "
"so must have even length");
return unwrappedQueue->get(1).toDouble();
}
inline void QueueRemoveFirstValueAndSize(ListObject* unwrappedQueue,
JSContext* cx) {
MOZ_ASSERT(!unwrappedQueue->isEmpty(),
"can't remove first value from an empty queue-with-sizes");
MOZ_ASSERT((unwrappedQueue->length() % 2) == 0,
"queue-with-sizes must consist of (value, size) element pairs and "
"so must have even length");
unwrappedQueue->popFirstPair(cx);
}
[[nodiscard]] inline bool QueueAppendValueAndSize(
JSContext* cx, JS::Handle<ListObject*> unwrappedQueue,
JS::Handle<JS::Value> value, double size) {
return unwrappedQueue->appendValueAndSize(cx, value, size);
}
} // namespace detail
/**
* Streams spec, 6.2.3. PeekQueueValue ( container ) nothrow
*/
inline JS::Value PeekQueueValue(ListObject* queue) {
return detail::QueueFirstValue(queue);
}
} // namespace js
#endif // builtin_streams_QueueWithSizes_inl_h