/*

 * Copyright (c) 2010 Google 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:

 *

 *     * Redistributions of source code must retain the above copyright

 * notice, this list of conditions and the following disclaimer.

 *     * 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.

 *     * Neither the name of Google Inc. nor the names of its

 * contributors may be used to endorse or promote products derived from

 * this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "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 THE COPYRIGHT

 * OWNER 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 "CSSOMUtils.h"

#include "PlatformString.h"

namespace WebCore {

static void appendCharacter(UChar32 c, Vector<UChar>& appendTo)

{

    if (U16_LENGTH(c) == 1)

        appendTo.append(static_cast<UChar>(c));

    else {

        appendTo.append(U16_LEAD(c));

        appendTo.append(U16_TRAIL(c));

    }

}

void serializeCharacter(UChar32 c, Vector<UChar>& appendTo)

{

    appendTo.append('\\');

    appendCharacter(c, appendTo);

}

void serializeCharacterAsCodePoint(UChar32 c, Vector<UChar>& appendTo)

{

    append(appendTo, String::format("\\%x ", c));

}

void serializeIdentifier(const String& identifier, String& appendTo)

{

    Vector<UChar> addend;

    serializeIdentifier(identifier, addend);

    appendTo.append(String::adopt(addend));

}

void serializeIdentifier(const String& identifier, Vector<UChar>& appendTo)

{

    bool isFirst = true;

    bool isSecond = false;

    bool isFirstCharHyphen = false;

    unsigned index = 0;

    while (index < identifier.length()) {

        UChar32 c = identifier.characterStartingAt(index);

        index += U16_LENGTH(c);

        if (c <= 0x1f || (0x30 <= c && c <= 0x39 && (isFirst || (isSecond && isFirstCharHyphen))))

            serializeCharacterAsCodePoint(c, appendTo);

        else if (c == 0x2d && isSecond && isFirstCharHyphen)

            serializeCharacter(c, appendTo);

        else if (0x80 <= c || c == 0x2d || c == 0x5f || (0x30 <= c && c <= 0x39) || (0x41 <= c && c <= 0x5a) || (0x61 <= c && c <= 0x7a))

            appendCharacter(c, appendTo);

        else

            serializeCharacter(c, appendTo);

        if (isFirst) {

            isFirst = false;

            isSecond = true;

            isFirstCharHyphen = (c == 0x2d);

        } else if (isSecond) {

            isSecond = false;

        }

    }

}

void serializeString(const String& string, String& appendTo)

{

    Vector<UChar> addend;

    serializeString(string, addend);

    appendTo.append(String::adopt(addend));

}

void serializeString(const String& string, Vector<UChar>& appendTo)

{

    appendTo.append('\"');

    unsigned index = 0;

    while (index < string.length()) {

        UChar32 c = string.characterStartingAt(index);

        index += U16_LENGTH(c);

        if (c <= 0x1f)

            serializeCharacterAsCodePoint(c, appendTo);

        else if (c == 0x22 || c == 0x5c)

            serializeCharacter(c, appendTo);

        else

            appendCharacter(c, appendTo);

    }

    appendTo.append('\"');

}

} // namespace WebCore