1 files changed, 77 insertions, 0 deletions
diff --git a/Source/WebCore/platform/text/String.cpp b/Source/WebCore/platform/text/String.cpp
new file mode 100644
index 0000000..f2f8d2e
--- /dev/null
+++ b/Source/WebCore/platform/text/String.cpp
@@ -0,0 +1,77 @@
+/*
+ * (C) 1999 Lars Knoll (knoll@kde.org)
+ * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
+ * Copyright (C) 2007-2009 Torch Mobile, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "config.h"
+#include "PlatformString.h"
+
+#include "SharedBuffer.h"
+#include "TextBreakIterator.h"
+#include <wtf/unicode/UTF8.h>
+#include <wtf/unicode/Unicode.h>
+
+using namespace WTF;
+using namespace WTF::Unicode;
+
+namespace WebCore {
+
+PassRefPtr<SharedBuffer> utf8Buffer(const String& string)
+{
+    // Allocate a buffer big enough to hold all the characters.
+    const int length = string.length();
+    Vector<char> buffer(length * 3);
+
+    // Convert to runs of 8-bit characters.
+    char* p = buffer.data();
+    const UChar* d = string.characters();
+    ConversionResult result = convertUTF16ToUTF8(&d, d + length, &p, p + buffer.size(), true);
+    if (result != conversionOK)
+        return 0;
+
+    buffer.shrink(p - buffer.data());
+    return SharedBuffer::adoptVector(buffer);
+}
+
+unsigned numGraphemeClusters(const String& s)
+{
+    TextBreakIterator* it = characterBreakIterator(s.characters(), s.length());
+    if (!it)
+        return s.length();
+
+    unsigned num = 0;
+    while (textBreakNext(it) != TextBreakDone)
+        ++num;
+    return num;
+}
+
+unsigned numCharactersInGraphemeClusters(const String& s, unsigned numGraphemeClusters)
+{
+    TextBreakIterator* it = characterBreakIterator(s.characters(), s.length());
+    if (!it)
+        return min(s.length(), numGraphemeClusters);
+
+    for (unsigned i = 0; i < numGraphemeClusters; ++i) {
+        if (textBreakNext(it) == TextBreakDone)
+            return s.length();
+    }
+    return textBreakCurrent(it);
+}
+
+} // namespace WebCore