| /* |
| * Copyright (C) 2020 Apple Inc. All rights reserved. |
| * |
| * 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. AND ITS CONTRIBUTORS ``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 ITS 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. |
| */ |
| |
| function initializeTransformStream() |
| { |
| "use strict"; |
| |
| let transformer = arguments[0]; |
| |
| // This is the path for CreateTransformStream. |
| if (@isObject(transformer) && @getByIdDirectPrivate(transformer, "TransformStream")) |
| return this; |
| |
| let writableStrategy = arguments[1]; |
| let readableStrategy = arguments[2]; |
| |
| if (transformer === @undefined) |
| transformer = null; |
| |
| if (readableStrategy === @undefined) |
| readableStrategy = { }; |
| |
| if (writableStrategy === @undefined) |
| writableStrategy = { }; |
| |
| let transformerDict = { }; |
| if (transformer !== null) { |
| if ("start" in transformer) { |
| transformerDict["start"] = transformer["start"]; |
| if (typeof transformerDict["start"] !== "function") |
| @throwTypeError("transformer.start should be a function"); |
| } |
| if ("transform" in transformer) { |
| transformerDict["transform"] = transformer["transform"]; |
| if (typeof transformerDict["transform"] !== "function") |
| @throwTypeError("transformer.transform should be a function"); |
| } |
| if ("flush" in transformer) { |
| transformerDict["flush"] = transformer["flush"]; |
| if (typeof transformerDict["flush"] !== "function") |
| @throwTypeError("transformer.flush should be a function"); |
| } |
| |
| if ("readableType" in transformer) |
| @throwRangeError("TransformStream transformer has a readableType"); |
| if ("writableType" in transformer) |
| @throwRangeError("TransformStream transformer has a writableType"); |
| } |
| |
| const readableHighWaterMark = @extractHighWaterMark(readableStrategy, 0); |
| const readableSizeAlgorithm = @extractSizeAlgorithm(readableStrategy); |
| |
| const writableHighWaterMark = @extractHighWaterMark(writableStrategy, 1); |
| const writableSizeAlgorithm = @extractSizeAlgorithm(writableStrategy); |
| |
| const startPromiseCapability = @newPromiseCapability(@Promise); |
| @initializeTransformStream(this, startPromiseCapability.@promise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm); |
| @setUpTransformStreamDefaultControllerFromTransformer(this, transformer, transformerDict); |
| |
| if ("start" in transformerDict) { |
| const controller = @getByIdDirectPrivate(this, "controller"); |
| const startAlgorithm = () => @promiseInvokeOrNoopMethodNoCatch(transformer, transformerDict["start"], [controller]); |
| startAlgorithm().@then(() => { |
| // FIXME: We probably need to resolve start promise with the result of the start algorithm. |
| startPromiseCapability.@resolve.@call(); |
| }, (error) => { |
| startPromiseCapability.@reject.@call(@undefined, error); |
| }); |
| } else |
| startPromiseCapability.@resolve.@call(); |
| |
| return this; |
| } |
| |
| @getter |
| function readable() |
| { |
| "use strict"; |
| |
| if (!@isTransformStream(this)) |
| throw @makeThisTypeError("TransformStream", "readable"); |
| |
| return @getByIdDirectPrivate(this, "readable"); |
| } |
| |
| function writable() |
| { |
| "use strict"; |
| |
| if (!@isTransformStream(this)) |
| throw @makeThisTypeError("TransformStream", "writable"); |
| |
| return @getByIdDirectPrivate(this, "writable"); |
| } |