JavaScriptCore-1097.3.tar.gz

[apple/javascriptcore.git] / runtime / JSStringJoiner.h

diff --git a/runtime/JSStringJoiner.h b/runtime/JSStringJoiner.h
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+/*
+ * Copyright (C) 2012 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.
+ */
+
+#ifndef JSStringJoiner_h
+#define JSStringJoiner_h
+
+#include "JSValue.h"
+#include "UString.h"
+#include <wtf/Vector.h>
+
+namespace JSC {
+
+class ExecState;
+
+
+class JSStringJoiner {
+public:
+    JSStringJoiner(const UString& separator, size_t stringCount);
+
+    void append(const UString&);
+    JSValue build(ExecState*);
+
+private:
+    UString m_separator;
+    Vector<UString> m_strings;
+
+    unsigned m_cumulatedStringsLength;
+    bool m_isValid;
+    bool m_is8Bits;
+};
+
+inline JSStringJoiner::JSStringJoiner(const UString& separator, size_t stringCount)
+    : m_separator(separator)
+    , m_cumulatedStringsLength(0)
+    , m_isValid(true)
+    , m_is8Bits(m_separator.is8Bit())
+{
+    ASSERT(!m_separator.isNull());
+    m_isValid = m_strings.tryReserveCapacity(stringCount);
+}
+
+inline void JSStringJoiner::append(const UString& str)
+{
+    if (!m_isValid)
+        return;
+
+    m_strings.uncheckedAppend(str);
+    if (!str.isNull()) {
+        m_cumulatedStringsLength += str.length();
+        m_is8Bits = m_is8Bits && str.is8Bit();
+    }
+}
+
+}
+
+#endif