cssmutablestyledeclaration.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * (C) 1999-2003 Lars Knoll ([e-mail])
 * Copyright (C) 2004, 2005, 2006, 2007, 2008 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 "CSSMutableStyleDeclaration.h"

#include "CSSImageValue.h"
#include "CSSParser.h"
#include "CSSProperty.h"
#include "CSSPropertyLonghand.h"
#include "CSSPropertyNames.h"
#include "CSSRule.h"
#include "CSSStyleSheet.h"
#include "CSSValueList.h"
#include "Document.h"
#include "ExceptionCode.h"
#include "StyledElement.h"

using namespace std;

namespace WebCore {

CSSMutableStyleDeclaration::CSSMutableStyleDeclaration()
    : m_node(0)
    , m_variableDependentValueCount(0)
    , m_strictParsing(false)
#ifndef NDEBUG
    , m_iteratorCount(0)
#endif
{
}

CSSMutableStyleDeclaration::CSSMutableStyleDeclaration(CSSRule* parent)
    : CSSStyleDeclaration(parent)
    , m_node(0)
    , m_variableDependentValueCount(0)
    , m_strictParsing(!parent || parent->useStrictParsing())
#ifndef NDEBUG
    , m_iteratorCount(0)
#endif
{
}

CSSMutableStyleDeclaration::CSSMutableStyleDeclaration(CSSRule* parent, const Vector<CSSProperty>& properties, unsigned variableDependentValueCount)
    : CSSStyleDeclaration(parent)
    , m_properties(properties)
    , m_node(0)
    , m_variableDependentValueCount(variableDependentValueCount)
    , m_strictParsing(!parent || parent->useStrictParsing())
#ifndef NDEBUG
    , m_iteratorCount(0)
#endif
{
    m_properties.shrinkToFit();
    // FIXME: This allows duplicate properties.
}

CSSMutableStyleDeclaration::CSSMutableStyleDeclaration(CSSRule* parent, const CSSProperty* const * properties, int numProperties)
    : CSSStyleDeclaration(parent)
    , m_node(0)
    , m_variableDependentValueCount(0)
    , m_strictParsing(!parent || parent->useStrictParsing())
#ifndef NDEBUG
    , m_iteratorCount(0)
#endif
{
    m_properties.reserveInitialCapacity(numProperties);
    for (int i = 0; i < numProperties; ++i) {
        ASSERT(properties[i]);
        m_properties.append(*properties[i]);
        if (properties[i]->value()->isVariableDependentValue())
            m_variableDependentValueCount++;
    }
    // FIXME: This allows duplicate properties.
}

CSSMutableStyleDeclaration& CSSMutableStyleDeclaration::operator=(const CSSMutableStyleDeclaration& other)
{
    ASSERT(!m_iteratorCount);
    // don't attach it to the same node, just leave the current m_node value
    m_properties = other.m_properties;
    m_strictParsing = other.m_strictParsing;
    return *this;
}

String CSSMutableStyleDeclaration::getPropertyValue(int propertyID) const
{
    RefPtr<CSSValue> value = getPropertyCSSValue(propertyID);
    if (value)
        return value->cssText();

    // Shorthand and 4-values properties
    switch (propertyID) {
        case CSSPropertyBackgroundPosition: {
            // FIXME: Is this correct? The code in cssparser.cpp is confusing
            const int properties[2] = { CSSPropertyBackgroundPositionX,
                                        CSSPropertyBackgroundPositionY };
            return getLayeredShorthandValue(properties, 2);
        }
        case CSSPropertyBackground: {
            const int properties[7] = { CSSPropertyBackgroundImage, CSSPropertyBackgroundRepeat, 
                                        CSSPropertyBackgroundAttachment, CSSPropertyBackgroundPosition, CSSPropertyWebkitBackgroundClip,
                                        CSSPropertyWebkitBackgroundOrigin, CSSPropertyBackgroundColor };
            return getLayeredShorthandValue(properties, 7);
        }
        case CSSPropertyBorder: {
            const int properties[3][4] = {{ CSSPropertyBorderTopWidth,
                                            CSSPropertyBorderRightWidth,
                                            CSSPropertyBorderBottomWidth,
                                            CSSPropertyBorderLeftWidth },
                                          { CSSPropertyBorderTopStyle,
                                            CSSPropertyBorderRightStyle,
                                            CSSPropertyBorderBottomStyle,
                                            CSSPropertyBorderLeftStyle },
                                          { CSSPropertyBorderTopColor,
                                            CSSPropertyBorderRightColor,
                                            CSSPropertyBorderBottomColor,
                                            CSSPropertyBorderLeftColor }};
            String res;
            const int nrprops = sizeof(properties) / sizeof(properties[0]);
            for (int i = 0; i < nrprops; ++i) {
                String value = getCommonValue(properties[i], 4);
                if (!value.isNull()) {
                    if (!res.isNull())
                        res += " ";
                    res += value;
                }
            }
            return res;
        }
        case CSSPropertyBorderTop: {
            const int properties[3] = { CSSPropertyBorderTopWidth, CSSPropertyBorderTopStyle,
                                        CSSPropertyBorderTopColor};
            return getShorthandValue(properties, 3);
        }
        case CSSPropertyBorderRight: {
            const int properties[3] = { CSSPropertyBorderRightWidth, CSSPropertyBorderRightStyle,
                                        CSSPropertyBorderRightColor};
            return getShorthandValue(properties, 3);
        }
        case CSSPropertyBorderBottom: {
            const int properties[3] = { CSSPropertyBorderBottomWidth, CSSPropertyBorderBottomStyle,
                                        CSSPropertyBorderBottomColor};
            return getShorthandValue(properties, 3);
        }
        case CSSPropertyBorderLeft: {
            const int properties[3] = { CSSPropertyBorderLeftWidth, CSSPropertyBorderLeftStyle,
                                        CSSPropertyBorderLeftColor};
            return getShorthandValue(properties, 3);
        }
        case CSSPropertyOutline: {
            const int properties[3] = { CSSPropertyOutlineWidth, CSSPropertyOutlineStyle,
                                        CSSPropertyOutlineColor };
            return getShorthandValue(properties, 3);
        }
        case CSSPropertyBorderColor: {
            const int properties[4] = { CSSPropertyBorderTopColor, CSSPropertyBorderRightColor,
                                        CSSPropertyBorderBottomColor, CSSPropertyBorderLeftColor };
            return get4Values(properties);
        }
        case CSSPropertyBorderWidth: {
            const int properties[4] = { CSSPropertyBorderTopWidth, CSSPropertyBorderRightWidth,
                                        CSSPropertyBorderBottomWidth, CSSPropertyBorderLeftWidth };
            return get4Values(properties);
        }
        case CSSPropertyBorderStyle: {
            const int properties[4] = { CSSPropertyBorderTopStyle, CSSPropertyBorderRightStyle,
                                        CSSPropertyBorderBottomStyle, CSSPropertyBorderLeftStyle };
            return get4Values(properties);
        }
        case CSSPropertyMargin: {
            const int properties[4] = { CSSPropertyMarginTop, CSSPropertyMarginRight,
                                        CSSPropertyMarginBottom, CSSPropertyMarginLeft };
            return get4Values(properties);
        }
        case CSSPropertyOverflow: {
            const int properties[2] = { CSSPropertyOverflowX, CSSPropertyOverflowY };
            return getCommonValue(properties, 2);
        }
        case CSSPropertyPadding: {
            const int properties[4] = { CSSPropertyPaddingTop, CSSPropertyPaddingRight,
                                        CSSPropertyPaddingBottom, CSSPropertyPaddingLeft };
            return get4Values(properties);
        }
        case CSSPropertyListStyle: {
            const int properties[3] = { CSSPropertyListStyleType, CSSPropertyListStylePosition,
                                        CSSPropertyListStyleImage };
            return getShorthandValue(properties, 3);
        }
        case CSSPropertyWebkitMaskPosition: {
            // FIXME: Is this correct? The code in cssparser.cpp is confusing
            const int properties[2] = { CSSPropertyWebkitMaskPositionX,
                                        CSSPropertyWebkitMaskPositionY };
            return getLayeredShorthandValue(properties, 2);
        }
        case CSSPropertyWebkitMask: {
            const int properties[] = { CSSPropertyWebkitMaskImage, CSSPropertyWebkitMaskRepeat, 
                                       CSSPropertyWebkitMaskAttachment, CSSPropertyWebkitMaskPosition, CSSPropertyWebkitMaskClip,
                                       CSSPropertyWebkitMaskOrigin };
            return getLayeredShorthandValue(properties, 6);
        }
        case CSSPropertyWebkitTransformOrigin: {
            const int properties[3] = { CSSPropertyWebkitTransformOriginX,
                                        CSSPropertyWebkitTransformOriginY,
                                        CSSPropertyWebkitTransformOriginZ };
            return getShorthandValue(properties, 3);
        }
        case CSSPropertyWebkitTransition: {
            const int properties[4] = { CSSPropertyWebkitTransitionProperty, CSSPropertyWebkitTransitionDuration,
                                        CSSPropertyWebkitTransitionTimingFunction, CSSPropertyWebkitTransitionDelay };
            return getLayeredShorthandValue(properties, 4);
        }
        case CSSPropertyWebkitAnimation: {
            const int properties[6] = { CSSPropertyWebkitAnimationName, CSSPropertyWebkitAnimationDuration,
                                        CSSPropertyWebkitAnimationTimingFunction, CSSPropertyWebkitAnimationDelay,
                                        CSSPropertyWebkitAnimationIterationCount, CSSPropertyWebkitAnimationDirection };
            return getLayeredShorthandValue(properties, 6);
        }
#if ENABLE(SVG)
        case CSSPropertyMarker: {
            RefPtr<CSSValue> value = getPropertyCSSValue(CSSPropertyMarkerStart);
            if (value)
                return value->cssText();
        }
#endif
    }
    return String();
}

String CSSMutableStyleDeclaration::get4Values(const int* properties) const
{
    String res;
    for (int i = 0; i < 4; ++i) {
        if (!isPropertyImplicit(properties[i])) {
            RefPtr<CSSValue> value = getPropertyCSSValue(properties[i]);

            // apparently all 4 properties must be specified.
            if (!value)
                return String();

            if (!res.isNull())
                res += " ";
            res += value->cssText();
        }
    }
    return res;
}

String CSSMutableStyleDeclaration::getLayeredShorthandValue(const int* properties, unsigned number) const
{
    String res;

    // Begin by collecting the properties into an array.
    Vector< RefPtr<CSSValue> > values(number);
    size_t numLayers = 0;
    
    for (size_t i = 0; i < number; ++i) {
        values[i] = getPropertyCSSValue(properties[i]);
        if (values[i]) {
            if (values[i]->isValueList()) {
                CSSValueList* valueList = static_cast<CSSValueList*>(values[i].get());
                numLayers = max(valueList->length(), numLayers);
            } else
                numLayers = max<size_t>(1U, numLayers);
        }
    }
    
    // Now stitch the properties together.  Implicit initial values are flagged as such and
    // can safely be omitted.
    for (size_t i = 0; i < numLayers; i++) {
        String layerRes;
        for (size_t j = 0; j < number; j++) {
            RefPtr<CSSValue> value;
            if (values[j]) {
                if (values[j]->isValueList())
                    value = static_cast<CSSValueList*>(values[j].get())->itemWithoutBoundsCheck(i);
                else {
                    value = values[j];
                    
                    // Color only belongs in the last layer.
                    if (properties[j] == CSSPropertyBackgroundColor) {
                        if (i != numLayers - 1)
                            value = 0;
                    } else if (i != 0) // Other singletons only belong in the first layer.
                        value = 0;
                }
            }
            
            if (value && !value->isImplicitInitialValue()) {
                if (!layerRes.isNull())
                    layerRes += " ";
                layerRes += value->cssText();
            }
        }
        
        if (!layerRes.isNull()) {
            if (!res.isNull())
                res += ", ";
            res += layerRes;
        }
    }

    return res;
}

String CSSMutableStyleDeclaration::getShorthandValue(const int* properties, int number) const
{
    String res;
    for (int i = 0; i < number; ++i) {
        if (!isPropertyImplicit(properties[i])) {
            RefPtr<CSSValue> value = getPropertyCSSValue(properties[i]);
            // FIXME: provide default value if !value
            if (value) {
                if (!res.isNull())
                    res += " ";
                res += value->cssText();
            }
        }
    }
    return res;
}

// only returns a non-null value if all properties have the same, non-null value
String CSSMutableStyleDeclaration::getCommonValue(const int* properties, int number) const
{
    String res;
    for (int i = 0; i < number; ++i) {
        if (!isPropertyImplicit(properties[i])) {
            RefPtr<CSSValue> value = getPropertyCSSValue(properties[i]);
            if (!value)
                return String();
            String text = value->cssText();
            if (text.isNull())
                return String();
            if (res.isNull())
                res = text;
            else if (res != text)
                return String();
        }
    }
    return res;
}

PassRefPtr<CSSValue> CSSMutableStyleDeclaration::getPropertyCSSValue(int propertyID) const
{
    const CSSProperty* property = findPropertyWithId(propertyID);
    return property ? property->value() : 0;
}

bool CSSMutableStyleDeclaration::removeShorthandProperty(int propertyID, bool notifyChanged) 
{
    CSSPropertyLonghand longhand = longhandForProperty(propertyID);
    if (longhand.length()) {
        removePropertiesInSet(longhand.properties(), longhand.length(), notifyChanged);
        return true;
    }
    return false;
}

String CSSMutableStyleDeclaration::removeProperty(int propertyID, bool notifyChanged, bool returnText)
{