1 files changed, 189 insertions, 0 deletions
diff --git a/Source/WebCore/Modules/streams/WritableStream.js b/Source/WebCore/Modules/streams/WritableStream.js
new file mode 100644
index 000000000..ac6ca2649
--- /dev/null
+++ b/Source/WebCore/Modules/streams/WritableStream.js
@@ -0,0 +1,189 @@
+/*
+ * 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(WRITABLE_STREAM_API)
+
+function initializeWritableStream(underlyingSink, strategy)
+{
+    "use strict";
+
+    if (underlyingSink === @undefined)
+        underlyingSink = { };
+    if (strategy === @undefined)
+        strategy = { highWaterMark: 0, size: function() { return 1; } };
+
+    if (!@isObject(underlyingSink))
+        @throwTypeError("WritableStream constructor takes an object as first argument");
+
+    if (!@isObject(strategy))
+        @throwTypeError("WritableStream constructor takes an object as second argument, if any");
+
+    this.@underlyingSink = underlyingSink;
+    this.@closedPromiseCapability = @newPromiseCapability(@Promise);
+    this.@readyPromiseCapability = { @promise: @Promise.@resolve() };
+    this.@queue = @newQueue();
+    this.@state = @streamWritable;
+    this.@started = false;
+    this.@writing = false;
+
+    this.@strategy = @validateAndNormalizeQueuingStrategy(strategy.size, strategy.highWaterMark);
+
+    @syncWritableStreamStateWithQueue(this);
+
+    const errorFunction = (e) => {
+        @errorWritableStream(this, e);
+    };
+    this.@startedPromise = @promiseInvokeOrNoopNoCatch(underlyingSink, "start", [errorFunction]);
+    this.@startedPromise.@then(() => {
+        this.@started = true;
+        this.@startedPromise = @undefined;
+    }, errorFunction);
+
+    return this;
+}
+
+function abort(reason)
+{
+    "use strict";
+
+    if (!@isWritableStream(this))
+        return @Promise.@reject(new @TypeError("The WritableStream.abort method can only be used on instances of WritableStream"));
+
+    if (this.@state === @streamClosed)
+        return @Promise.@resolve();
+
+    if (this.@state === @streamErrored)
+        return @Promise.@reject(this.@storedError);
+
+    @errorWritableStream(this, reason);
+
+    return @promiseInvokeOrFallbackOrNoop(this.@underlyingSink, "abort", [reason], "close", []).@then(function() { });
+}
+
+function close()
+{
+    "use strict";
+
+    if (!@isWritableStream(this))
+        return @Promise.@reject(new @TypeError("The WritableStream.close method can only be used on instances of WritableStream"));
+
+    if (this.@state === @streamClosed || this.@state === @streamClosing)
+        return @Promise.@reject(new @TypeError("Cannot close a WritableString that is closed or closing"));
+
+    if (this.@state === @streamErrored)
+        return @Promise.@reject(this.@storedError);
+
+    if (this.@state === @streamWaiting)
+        this.@readyPromiseCapability.@resolve.@call();
+
+    this.@state = @streamClosing;
+    @enqueueValueWithSize(this.@queue, "close", 0);
+    @callOrScheduleWritableStreamAdvanceQueue(this);
+
+    return this.@closedPromiseCapability.@promise;
+}
+
+function write(chunk)
+{
+    "use strict";
+
+    if (!@isWritableStream(this))
+        return @Promise.@reject(new @TypeError("The WritableStream.write method can only be used on instances of WritableStream"));
+
+    if (this.@state === @streamClosed || this.@state === @streamClosing)
+        return @Promise.@reject(new @TypeError("Cannot write on a WritableString that is closed or closing"));
+
+    if (this.@state === @streamErrored)
+        return @Promise.@reject(this.@storedError);
+
+    @assert(this.@state === @streamWritable || this.@state === @streamWaiting);
+
+    let chunkSize = 1;
+    if (this.@strategy.size !== @undefined) {
+        try {
+            chunkSize = this.@strategy.size.@call(@undefined, chunk);
+        } catch(e) {
+            @errorWritableStream(this, e);
+            return @Promise.@reject(e);
+        }
+    }
+
+    const promiseCapability = @newPromiseCapability(@Promise);
+    try {
+        @enqueueValueWithSize(this.@queue, { promiseCapability: promiseCapability, chunk: chunk }, chunkSize);
+    } catch (e) {
+        @errorWritableStream(this, e);
+        return @Promise.@reject(e);
+    }
+
+    @syncWritableStreamStateWithQueue(this);
+    @callOrScheduleWritableStreamAdvanceQueue(this);
+
+    return promiseCapability.@promise;
+}
+
+function closed()
+{
+    "use strict";
+
+    if (!@isWritableStream(this))
+        return @Promise.@reject(new @TypeError("The WritableStream.closed getter can only be used on instances of WritableStream"));
+
+    return this.@closedPromiseCapability.@promise;
+}
+
+function ready()
+{
+    "use strict";
+
+    if (!@isWritableStream(this))
+        return @Promise.@reject(new @TypeError("The WritableStream.ready getter can only be used on instances of WritableStream"));
+
+    return this.@readyPromiseCapability.@promise;
+}
+
+function state()
+{
+    "use strict";
+
+    if (!@isWritableStream(this))
+        @throwTypeError("The WritableStream.state getter can only be used on instances of WritableStream");
+
+    switch(this.@state) {
+    case @streamClosed:
+        return "closed";
+    case @streamClosing:
+        return "closing";
+    case @streamErrored:
+        return "errored";
+    case @streamWaiting:
+        return "waiting";
+    case @streamWritable:
+        return "writable";
+    }
+
+    @assert(false);
+}