/*

 * Copyright (C) 2004, 2008 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 COMPUTER, 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 COMPUTER, 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. 

 */

#include "config.h"

#include "HTMLInterchange.h"

#include "CharacterNames.h"

#include "Text.h"

#include "TextIterator.h"

#include <wtf/StdLibExtras.h>

namespace WebCore {

namespace {

String convertedSpaceString()

{

    DEFINE_STATIC_LOCAL(String, convertedSpaceString, ());

    if (convertedSpaceString.isNull()) {

        convertedSpaceString = "<span class=\"";

        convertedSpaceString += AppleConvertedSpace;

        convertedSpaceString += "\">";

        convertedSpaceString.append(noBreakSpace);

        convertedSpaceString += "</span>";

    }

    return convertedSpaceString;

}

} // end anonymous namespace

String convertHTMLTextToInterchangeFormat(const String& in, const Text* node)

{

    // Assume all the text comes from node.

    if (node->renderer() && node->renderer()->style()->preserveNewline())

        return in;

    Vector<UChar> s;

    unsigned i = 0;

    unsigned consumed = 0;

    while (i < in.length()) {

        consumed = 1;

        if (isCollapsibleWhitespace(in[i])) {

            // count number of adjoining spaces

            unsigned j = i + 1;

            while (j < in.length() && isCollapsibleWhitespace(in[j]))

                j++;

            unsigned count = j - i;

            consumed = count;

            while (count) {

                unsigned add = count % 3;

                switch (add) {

                    case 0:

                        append(s, convertedSpaceString());

                        s.append(' ');

                        append(s, convertedSpaceString());

                        add = 3;

                        break;

                    case 1:

                        if (i == 0 || i + 1 == in.length()) // at start or end of string

                            append(s, convertedSpaceString());

                        else

                            s.append(' ');

                        break;

                    case 2:

                        if (i == 0) {

                             // at start of string

                            append(s, convertedSpaceString());

                            s.append(' ');

                        } else if (i + 2 == in.length()) {

                             // at end of string

                            append(s, convertedSpaceString());

                            append(s, convertedSpaceString());

                        } else {

                            append(s, convertedSpaceString());

                            s.append(' ');

                        }

                        break;

                }

                count -= add;

            }

        } else

            s.append(in[i]);

        i += consumed;

    }

    return String::adopt(s);

}

} // namespace WebCore