webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 135 insertions, 0 deletions

diff --git a/Source/WebCore/Modules/streams/WritableStreamInternals.js b/Source/WebCore/Modules/streams/WritableStreamInternals.js
new file mode 100644
index 000000000..cffea5a3d
--- /dev/null
+++ b/Source/WebCore/Modules/streams/WritableStreamInternals.js
@@ -0,0 +1,135 @@
+/*
+ * 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)
+// @internal
+
+function isWritableStream(stream)
+{
+    "use strict";
+
+    return @isObject(stream) && !!stream.@underlyingSink;
+}
+
+function syncWritableStreamStateWithQueue(stream)
+{
+    "use strict";
+
+    if (stream.@state === @streamClosing)
+        return;
+
+    @assert(stream.@state === @streamWritable || stream.@state === @streamWaiting);
+
+    const shouldApplyBackpressure = stream.@queue.size > stream.@strategy.highWaterMark;
+    if (shouldApplyBackpressure && stream.@state === @streamWritable) {
+        stream.@state = @streamWaiting;
+        stream.@readyPromiseCapability = @newPromiseCapability(@Promise);
+    }
+    if (!shouldApplyBackpressure && stream.@state === @streamWaiting) {
+        stream.@state = @streamWritable;
+        stream.@readyPromiseCapability.@resolve.@call();
+    }
+}
+
+function errorWritableStream(stream, e)
+{
+    "use strict";
+
+    if (stream.@state === @streamClosed || stream.@state === @streamErrored)
+        return;
+    while (stream.@queue.content.length > 0) {
+        const writeRecord = @dequeueValue(stream.@queue);
+        if (writeRecord !== "close")
+            writeRecord.promiseCapability.@reject.@call(@undefined, e);
+    }
+    stream.@storedError = e;
+    if (stream.@state === @streamWaiting)
+        stream.@readyPromiseCapability.@resolve.@call();
+    stream.@closedPromiseCapability.@reject.@call(@undefined, e);
+    stream.@state = @streamErrored;
+}
+
+function callOrScheduleWritableStreamAdvanceQueue(stream)
+{
+    "use strict";
+
+    if (!stream.@started)
+        stream.@startedPromise.@then(function() { @writableStreamAdvanceQueue(stream); });
+    else
+        @writableStreamAdvanceQueue(stream);
+}
+
+function writableStreamAdvanceQueue(stream)
+{
+    "use strict";
+
+    if (stream.@queue.content.length === 0 || stream.@writing)
+        return;
+
+    const writeRecord = @peekQueueValue(stream.@queue);
+    if (writeRecord === "close") {
+        @assert(stream.@state === @streamClosing);
+        @dequeueValue(stream.@queue);
+        @assert(stream.@queue.content.length === 0);
+        @closeWritableStream(stream);
+        return;
+    }
+
+    stream.@writing = true;
+    @promiseInvokeOrNoop(stream.@underlyingSink, "write", [writeRecord.chunk]).@then(
+        function() {
+            if (stream.@state === @streamErrored)
+                return;
+            stream.@writing = false;
+            writeRecord.promiseCapability.@resolve.@call();
+            @dequeueValue(stream.@queue);
+            @syncWritableStreamStateWithQueue(stream);
+            @writableStreamAdvanceQueue(stream);
+        },
+        function(r) {
+            @errorWritableStream(stream, r);
+        }
+    );
+}
+
+function closeWritableStream(stream)
+{
+    "use strict";
+
+    @assert(stream.@state === @streamClosing);
+    @promiseInvokeOrNoop(stream.@underlyingSink, "close").@then(
+        function() {
+            if (stream.@state === @streamErrored)
+                return;
+            @assert(stream.@state === @streamClosing);
+            stream.@closedPromiseCapability.@resolve.@call();
+            stream.@state = @streamClosed;
+        },
+        function(r) {
+            @errorWritableStream(stream, r);
+        }
+    );
+}