/*

 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)

 *           (C) 1999 Antti Koivisto (koivisto@kde.org)

 *           (C) 2000 Simon Hausmann <hausmann@kde.org>

 * Copyright (C) 2003, 2006, 2008, 2010 Apple Inc. All rights reserved.

 *

 * 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 "HTMLFontElement.h"

#include "Attribute.h"

#include "CSSPropertyNames.h"

#include "CSSValueKeywords.h"

#include "HTMLNames.h"

using namespace WTF;

namespace WebCore {

using namespace HTMLNames;

HTMLFontElement::HTMLFontElement(const QualifiedName& tagName, Document* document)

    : HTMLElement(tagName, document)

{

    ASSERT(hasTagName(fontTag));

}

PassRefPtr<HTMLFontElement> HTMLFontElement::create(const QualifiedName& tagName, Document* document)

{

    return adoptRef(new HTMLFontElement(tagName, document));

}

// Allows leading spaces.

// Allows trailing nonnumeric characters.

// Returns 10 for any size greater than 9.

static bool parseFontSizeNumber(const String& s, int& size)

{

    unsigned pos = 0;

    // Skip leading spaces.

    while (isSpaceOrNewline(s[pos]))

        ++pos;

    // Skip a plus or minus.

    bool sawPlus = false;

    bool sawMinus = false;

    if (s[pos] == '+') {

        ++pos;

        sawPlus = true;

    } else if (s[pos] == '-') {

        ++pos;

        sawMinus = true;

    }

    // Parse a single digit.

    if (!isASCIIDigit(s[pos]))

        return false;

    int num = s[pos++] - '0';

    // Check for an additional digit.

    if (isASCIIDigit(s[pos]))

        num = 10;

    if (sawPlus) {

        size = num + 3;

        return true;

    }

    // Don't return 0 (which means 3) or a negative number (which means the same as 1).

    if (sawMinus) {

        size = num == 1 ? 2 : 1;

        return true;

    }

    size = num;

    return true;

}

bool HTMLFontElement::mapToEntry(const QualifiedName& attrName, MappedAttributeEntry& result) const

{

    if (attrName == sizeAttr ||

        attrName == colorAttr ||

        attrName == faceAttr) {

        result = eUniversal;

        return false;

    }

    return HTMLElement::mapToEntry(attrName, result);

}

bool HTMLFontElement::cssValueFromFontSizeNumber(const String& s, int& size)

{

    int num;

    if (!parseFontSizeNumber(s, num))

        return false;

    switch (num) {

        case 2: 

            size = CSSValueSmall; 

            break;

        case 0: // treat 0 the same as 3, because people expect it to be between -1 and +1

        case 3: 

            size = CSSValueMedium; 

            break;

        case 4: 

            size = CSSValueLarge; 

            break;

        case 5: 

            size = CSSValueXLarge; 

            break;

        case 6: 

            size = CSSValueXxLarge; 

            break;

        default:

            if (num > 6)

                size = CSSValueWebkitXxxLarge;

            else

                size = CSSValueXSmall;

    }

    return true;

}

void HTMLFontElement::parseMappedAttribute(Attribute* attr)

{

    if (attr->name() == sizeAttr) {

        int size;

        if (cssValueFromFontSizeNumber(attr->value(), size))

            addCSSProperty(attr, CSSPropertyFontSize, size);

    } else if (attr->name() == colorAttr) {

        addCSSColor(attr, CSSPropertyColor, attr->value());

    } else if (attr->name() == faceAttr) {

        addCSSProperty(attr, CSSPropertyFontFamily, attr->value());

    } else

        HTMLElement::parseMappedAttribute(attr);

}

}