JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / runtime / IteratorOperations.cpp

diff --git a/runtime/IteratorOperations.cpp b/runtime/IteratorOperations.cpp
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+++ b/runtime/IteratorOperations.cpp
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+/*
+ * Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
+ *
+ * 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.
+ */
+
+#include "config.h"
+#include "IteratorOperations.h"
+
+#include "Error.h"
+#include "JSCInlines.h"
+#include "ObjectConstructor.h"
+
+using namespace WTF;
+
+namespace JSC {
+
+JSValue iteratorNext(ExecState* exec, JSValue iterator, JSValue value)
+{
+    JSValue nextFunction = iterator.get(exec, exec->vm().propertyNames->next);
+    if (exec->hadException())
+        return jsUndefined();
+
+    CallData nextFunctionCallData;
+    CallType nextFunctionCallType = getCallData(nextFunction, nextFunctionCallData);
+    if (nextFunctionCallType == CallTypeNone)
+        return throwTypeError(exec);
+
+    MarkedArgumentBuffer nextFunctionArguments;
+    if (!value.isEmpty())
+        nextFunctionArguments.append(value);
+    JSValue result = call(exec, nextFunction, nextFunctionCallType, nextFunctionCallData, iterator, nextFunctionArguments);
+    if (exec->hadException())
+        return jsUndefined();
+
+    if (!result.isObject())
+        return throwTypeError(exec, ASCIILiteral("Iterator result interface is not an object."));
+
+    return result;
+}
+
+JSValue iteratorNext(ExecState* exec, JSValue iterator)
+{
+    return iteratorNext(exec, iterator, JSValue());
+}
+
+JSValue iteratorValue(ExecState* exec, JSValue iterResult)
+{
+    return iterResult.get(exec, exec->vm().propertyNames->value);
+}
+
+bool iteratorComplete(ExecState* exec, JSValue iterResult)
+{
+    JSValue done = iterResult.get(exec, exec->vm().propertyNames->done);
+    return done.toBoolean(exec);
+}
+
+JSValue iteratorStep(ExecState* exec, JSValue iterator)
+{
+    JSValue result = iteratorNext(exec, iterator);
+    if (exec->hadException())
+        return jsUndefined();
+    bool done = iteratorComplete(exec, result);
+    if (exec->hadException())
+        return jsUndefined();
+    if (done)
+        return jsBoolean(false);
+    return result;
+}
+
+void iteratorClose(ExecState* exec, JSValue iterator)
+{
+    Exception* exception = nullptr;
+    if (exec->hadException()) {
+        exception = exec->exception();
+        exec->clearException();
+    }
+    JSValue returnFunction = iterator.get(exec, exec->vm().propertyNames->returnKeyword);
+    if (exec->hadException())
+        return;
+
+    if (returnFunction.isUndefined()) {
+        if (exception)
+            exec->vm().throwException(exec, exception);
+        return;
+    }
+
+    CallData returnFunctionCallData;
+    CallType returnFunctionCallType = getCallData(returnFunction, returnFunctionCallData);
+    if (returnFunctionCallType == CallTypeNone) {
+        if (exception)
+            exec->vm().throwException(exec, exception);
+        else
+            throwTypeError(exec);
+        return;
+    }
+
+    MarkedArgumentBuffer returnFunctionArguments;
+    JSValue innerResult = call(exec, returnFunction, returnFunctionCallType, returnFunctionCallData, iterator, returnFunctionArguments);
+
+    if (exception) {
+        exec->vm().throwException(exec, exception);
+        return;
+    }
+
+    if (exec->hadException())
+        return;
+
+    if (!innerResult.isObject()) {
+        throwTypeError(exec, ASCIILiteral("Iterator result interface is not an object."));
+        return;
+    }
+}
+
+JSObject* createIteratorResultObject(ExecState* exec, JSValue value, bool done)
+{
+    JSObject* resultObject = constructEmptyObject(exec);
+    resultObject->putDirect(exec->vm(), exec->propertyNames().done, jsBoolean(done));
+    resultObject->putDirect(exec->vm(), exec->propertyNames().value, value);
+    return resultObject;
+}
+
+} // namespace JSC