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/*
* Copyright (C) 2015 Canon Inc.
* Copyright (C) 2015 Igalia.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// @conditional=ENABLE(READABLE_STREAM_API) || ENABLE(WRITABLE_STREAM_API)
// @internal
function shieldingPromiseResolve(result)
{
const promise = @Promise.@resolve(result);
if (promise.@then === @undefined)
promise.@then = @Promise.prototype.@then;
return promise;
}
function promiseInvokeOrNoopNoCatch(object, key, args)
{
"use strict";
const method = object[key];
if (method === @undefined)
return @Promise.@resolve();
return @shieldingPromiseResolve(method.@apply(object, args));
}
function promiseInvokeOrNoop(object, key, args)
{
"use strict";
try {
return @promiseInvokeOrNoopNoCatch(object, key, args);
}
catch(error) {
return @Promise.@reject(error);
}
}
function promiseInvokeOrFallbackOrNoop(object, key1, args1, key2, args2)
{
"use strict";
try {
const method = object[key1];
if (method === @undefined)
return @promiseInvokeOrNoopNoCatch(object, key2, args2);
return @shieldingPromiseResolve(method.@apply(object, args1));
}
catch(error) {
return @Promise.@reject(error);
}
}
function validateAndNormalizeQueuingStrategy(size, highWaterMark)
{
"use strict";
if (size !== @undefined && typeof size !== "function")
@throwTypeError("size parameter must be a function");
const normalizedStrategy = { };
normalizedStrategy.size = size;
normalizedStrategy.highWaterMark = @Number(highWaterMark);
if (@isNaN(normalizedStrategy.highWaterMark) || normalizedStrategy.highWaterMark < 0)
@throwRangeError("highWaterMark value is negative or not a number");
return normalizedStrategy;
}
function newQueue()
{
"use strict";
return { content: [], size: 0 };
}
function dequeueValue(queue)
{
"use strict";
const record = queue.content.@shift();
queue.size -= record.size;
return record.value;
}
function enqueueValueWithSize(queue, value, size)
{
"use strict";
size = @Number(size);
if (!@isFinite(size) || size < 0)
@throwRangeError("size has an incorrect value");
queue.content.@push({ value: value, size: size });
queue.size += size;
}
function peekQueueValue(queue)
{
"use strict";
@assert(queue.content.length > 0);
return queue.content[0].value;
}
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