--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/JavaScriptCore/runtime/JSStringBuilder.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,133 @@
+/*
+ * Copyright (C) 2009 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 JSStringBuilder_h
+#define JSStringBuilder_h
+
+#include "ExceptionHelpers.h"
+#include "JSString.h"
+#include "Vector.h"
+
+namespace JSC {
+
+class JSStringBuilder {
+public:
+    JSStringBuilder()
+        : m_okay(true)
+    {
+    }
+
+    void append(const UChar u)
+    {
+        m_okay &= buffer.tryAppend(&u, 1);
+    }
+
+    void append(const char* str)
+    {
+        append(str, strlen(str));
+    }
+
+    void append(const char* str, size_t len)
+    {
+        m_okay &= buffer.tryReserveCapacity(buffer.size() + len);
+        for (size_t i = 0; i < len; i++) {
+            UChar u = static_cast<unsigned char>(str[i]);
+            m_okay &= buffer.tryAppend(&u, 1);
+        }
+    }
+
+    void append(const UChar* str, size_t len)
+    {
+        m_okay &= buffer.tryAppend(str, len);
+    }
+
+    void append(const UString& str)
+    {
+        m_okay &= buffer.tryAppend(str.data(), str.size());
+    }
+
+    JSValue build(ExecState* exec)
+    {
+        if (!m_okay)
+            return throwOutOfMemoryError(exec);
+        buffer.shrinkToFit();
+        if (!buffer.data())
+            return throwOutOfMemoryError(exec);
+        return jsString(exec, UString::adopt(buffer));
+    }
+
+protected:
+    Vector<UChar, 64> buffer;
+    bool m_okay;
+};
+
+template<typename StringType1, typename StringType2>
+inline JSValue jsMakeNontrivialString(ExecState* exec, StringType1 string1, StringType2 string2)
+{
+    PassRefPtr<UStringImpl> result = tryMakeString(string1, string2);
+    if (!result)
+        return throwOutOfMemoryError(exec);
+    return jsNontrivialString(exec, result);
+}
+
+template<typename StringType1, typename StringType2, typename StringType3>
+inline JSValue jsMakeNontrivialString(ExecState* exec, StringType1 string1, StringType2 string2, StringType3 string3)
+{
+    PassRefPtr<UStringImpl> result = tryMakeString(string1, string2, string3);
+    if (!result)
+        return throwOutOfMemoryError(exec);
+    return jsNontrivialString(exec, result);
+}
+
+template<typename StringType1, typename StringType2, typename StringType3, typename StringType4>
+inline JSValue jsMakeNontrivialString(ExecState* exec, StringType1 string1, StringType2 string2, StringType3 string3, StringType4 string4)
+{
+    PassRefPtr<UStringImpl> result = tryMakeString(string1, string2, string3, string4);
+    if (!result)
+        return throwOutOfMemoryError(exec);
+    return jsNontrivialString(exec, result);
+}
+
+template<typename StringType1, typename StringType2, typename StringType3, typename StringType4, typename StringType5>
+inline JSValue jsMakeNontrivialString(ExecState* exec, StringType1 string1, StringType2 string2, StringType3 string3, StringType4 string4, StringType5 string5)
+{
+    PassRefPtr<UStringImpl> result = tryMakeString(string1, string2, string3, string4, string5);
+    if (!result)
+        return throwOutOfMemoryError(exec);
+    return jsNontrivialString(exec, result);
+}
+
+template<typename StringType1, typename StringType2, typename StringType3, typename StringType4, typename StringType5, typename StringType6>
+inline JSValue jsMakeNontrivialString(ExecState* exec, StringType1 string1, StringType2 string2, StringType3 string3, StringType4 string4, StringType5 string5, StringType6 string6)
+{
+    PassRefPtr<UStringImpl> result = tryMakeString(string1, string2, string3, string4, string5, string6);
+    if (!result)
+        return throwOutOfMemoryError(exec);
+    return jsNontrivialString(exec, result);
+}
+
+}
+
+#endif