webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 73 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/runtime/IteratorOperations.h b/Source/JavaScriptCore/runtime/IteratorOperations.h
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+++ b/Source/JavaScriptCore/runtime/IteratorOperations.h
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+/*
+ * Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
+ * Copyright (C) 2016 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. ``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.
+ */
+
+#pragma once
+
+#include "JSCJSValue.h"
+#include "JSObject.h"
+#include "ThrowScope.h"
+
+namespace JSC {
+
+JSValue iteratorNext(ExecState*, JSValue iterator, JSValue);
+JSValue iteratorNext(ExecState*, JSValue iterator);
+JS_EXPORT_PRIVATE JSValue iteratorValue(ExecState*, JSValue iterator);
+bool iteratorComplete(ExecState*, JSValue iterator);
+JS_EXPORT_PRIVATE JSValue iteratorStep(ExecState*, JSValue iterator);
+JS_EXPORT_PRIVATE void iteratorClose(ExecState*, JSValue iterator);
+JS_EXPORT_PRIVATE JSObject* createIteratorResultObject(ExecState*, JSValue, bool done);
+
+Structure* createIteratorResultObjectStructure(VM&, JSGlobalObject&);
+
+JS_EXPORT_PRIVATE bool hasIteratorMethod(ExecState&, JSValue);
+JS_EXPORT_PRIVATE JSValue iteratorForIterable(ExecState*, JSValue iterable);
+
+template <typename CallBackType>
+void forEachInIterable(ExecState* exec, JSValue iterable, const CallBackType& callback)
+{
+    auto& vm = exec->vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+
+    JSValue iterator = iteratorForIterable(exec, iterable);
+    RETURN_IF_EXCEPTION(scope, void());
+    while (true) {
+        JSValue next = iteratorStep(exec, iterator);
+        if (UNLIKELY(scope.exception()) || next.isFalse())
+            return;
+
+        JSValue nextValue = iteratorValue(exec, next);
+        RETURN_IF_EXCEPTION(scope, void());
+
+        callback(vm, exec, nextValue);
+        if (UNLIKELY(scope.exception())) {
+            scope.release();
+            iteratorClose(exec, iterator);
+            return;
+        }
+    }
+}
+
+} // namespace JSC