1 files changed, 114 insertions, 0 deletions
diff --git a/Source/WebCore/bindings/js/JSDOMConvertStrings.cpp b/Source/WebCore/bindings/js/JSDOMConvertStrings.cpp
new file mode 100644
index 000000000..6c95f6680
--- /dev/null
+++ b/Source/WebCore/bindings/js/JSDOMConvertStrings.cpp
@@ -0,0 +1,114 @@
+/*
+ *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2004-2011, 2013, 2016 Apple Inc. All rights reserved.
+ *  Copyright (C) 2007 Samuel Weinig <sam@webkit.org>
+ *  Copyright (C) 2013 Michael Pruett <michael@68k.org>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser 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
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "config.h"
+#include "JSDOMConvertStrings.h"
+
+#include "JSDOMExceptionHandling.h"
+#include <heap/HeapInlines.h>
+#include <runtime/JSCJSValueInlines.h>
+#include <wtf/text/StringBuilder.h>
+#include <wtf/unicode/CharacterNames.h>
+
+using namespace JSC;
+
+namespace WebCore {
+
+static inline String stringToByteString(ExecState& state, JSC::ThrowScope& scope, String&& string)
+{
+    if (!string.containsOnlyLatin1()) {
+        throwTypeError(&state, scope);
+        return { };
+    }
+
+    return string;
+}
+
+String identifierToByteString(ExecState& state, const Identifier& identifier)
+{
+    VM& vm = state.vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+
+    auto string = identifier.string();
+    return stringToByteString(state, scope, WTFMove(string));
+}
+
+String valueToByteString(ExecState& state, JSValue value)
+{
+    VM& vm = state.vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+
+    auto string = value.toWTFString(&state);
+    RETURN_IF_EXCEPTION(scope, { });
+
+    return stringToByteString(state, scope, WTFMove(string));
+}
+
+static inline bool hasUnpairedSurrogate(StringView string)
+{
+    // Fast path for 8-bit strings; they can't have any surrogates.
+    if (string.is8Bit())
+        return false;
+    for (auto codePoint : string.codePoints()) {
+        if (U_IS_SURROGATE(codePoint))
+            return true;
+    }
+    return false;
+}
+
+static inline String stringToUSVString(String&& string)
+{
+    // Fast path for the case where there are no unpaired surrogates.
+    if (!hasUnpairedSurrogate(string))
+        return string;
+
+    // Slow path: http://heycam.github.io/webidl/#dfn-obtain-unicode
+    // Replaces unpaired surrogates with the replacement character.
+    StringBuilder result;
+    result.reserveCapacity(string.length());
+    StringView view { string };
+    for (auto codePoint : view.codePoints()) {
+        if (U_IS_SURROGATE(codePoint))
+            result.append(replacementCharacter);
+        else
+            result.append(codePoint);
+    }
+    return result.toString();
+}
+
+String identifierToUSVString(ExecState&, const Identifier& identifier)
+{
+    auto string = identifier.string();
+    return stringToUSVString(WTFMove(string));
+}
+
+String valueToUSVString(ExecState& state, JSValue value)
+{
+    VM& vm = state.vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+
+    auto string = value.toWTFString(&state);
+    RETURN_IF_EXCEPTION(scope, { });
+
+    return stringToUSVString(WTFMove(string));
+}
+
+} // namespace WebCore