applystylecommand.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

/*
 * Copyright (C) 2005, 2006, 2008, 2009 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 "ApplyStyleCommand.h"

#include "CSSComputedStyleDeclaration.h"
#include "CSSParser.h"
#include "CSSProperty.h"
#include "CSSPropertyNames.h"
#include "CSSValueKeywords.h"
#include "Document.h"
#include "Editor.h"
#include "Frame.h"
#include "HTMLElement.h"
#include "HTMLInterchange.h"
#include "HTMLNames.h"
#include "NodeList.h"
#include "Range.h"
#include "RenderObject.h"
#include "Text.h"
#include "TextIterator.h"
#include "htmlediting.h"
#include "visible_units.h"
#include <wtf/StdLibExtras.h>

namespace WebCore {

using namespace HTMLNames;

class StyleChange {
public:
    explicit StyleChange(CSSStyleDeclaration*, const Position&);

    String cssStyle() const { return m_cssStyle; }
    bool applyBold() const { return m_applyBold; }
    bool applyItalic() const { return m_applyItalic; }
    bool applySubscript() const { return m_applySubscript; }
    bool applySuperscript() const { return m_applySuperscript; }
    bool applyFontColor() const { return m_applyFontColor.length() > 0; }
    bool applyFontFace() const { return m_applyFontFace.length() > 0; }
    bool applyFontSize() const { return m_applyFontSize.length() > 0; }

    String fontColor() { return m_applyFontColor; }
    String fontFace() { return m_applyFontFace; }
    String fontSize() { return m_applyFontSize; }

private:
    void init(PassRefPtr<CSSStyleDeclaration>, const Position&);
    bool checkForLegacyHTMLStyleChange(const CSSProperty*);
    static bool currentlyHasStyle(const Position&, const CSSProperty*);
    
    String m_cssStyle;
    bool m_applyBold;
    bool m_applyItalic;
    bool m_applySubscript;
    bool m_applySuperscript;
    String m_applyFontColor;
    String m_applyFontFace;
    String m_applyFontSize;
};


StyleChange::StyleChange(CSSStyleDeclaration* style, const Position& position)
    : m_applyBold(false)
    , m_applyItalic(false)
    , m_applySubscript(false)
    , m_applySuperscript(false)
{
    init(style, position);
}

void StyleChange::init(PassRefPtr<CSSStyleDeclaration> style, const Position& position)
{
    Document* document = position.node() ? position.node()->document() : 0;
    if (!document || !document->frame())
        return;
        
    bool useHTMLFormattingTags = !document->frame()->editor()->shouldStyleWithCSS();
            
    RefPtr<CSSMutableStyleDeclaration> mutableStyle = style->makeMutable();
    
    String styleText("");

    bool addedDirection = false;
    CSSMutableStyleDeclaration::const_iterator end = mutableStyle->end();
    for (CSSMutableStyleDeclaration::const_iterator it = mutableStyle->begin(); it != end; ++it) {
        const CSSProperty *property = &*it;

        // If position is empty or the position passed in already has the 
        // style, just move on.
        if (position.isNotNull() && currentlyHasStyle(position, property))
            continue;
        
        // Changing the whitespace style in a tab span would collapse the tab into a space.
        if (property->id() == CSSPropertyWhiteSpace && (isTabSpanTextNode(position.node()) || isTabSpanNode((position.node()))))
            continue;
        
        // If needed, figure out if this change is a legacy HTML style change.
        if (useHTMLFormattingTags && checkForLegacyHTMLStyleChange(property))
            continue;

        if (property->id() == CSSPropertyDirection) {
            if (addedDirection)
                continue;
            addedDirection = true;
        }

        // Add this property

        if (property->id() == CSSPropertyWebkitTextDecorationsInEffect) {
            // we have to special-case text decorations
            // FIXME: Why?
            CSSProperty alteredProperty(CSSPropertyTextDecoration, property->value(), property->isImportant());
            styleText += alteredProperty.cssText();
        } else
            styleText += property->cssText();

        if (!addedDirection && property->id() == CSSPropertyUnicodeBidi) {
            styleText += "direction: " + style->getPropertyValue(CSSPropertyDirection) + "; ";
            addedDirection = true;
        }
    }

    // Save the result for later
    m_cssStyle = styleText.stripWhiteSpace();
}

// This function is the mapping from CSS styles to styling tags (like font-weight: bold to <b>)
bool StyleChange::checkForLegacyHTMLStyleChange(const CSSProperty* property)
{
    if (!property || !property->value())
        return false;
    
    String valueText(property->value()->cssText());
    switch (property->id()) {
        case CSSPropertyFontWeight:
            if (equalIgnoringCase(valueText, "bold")) {
                m_applyBold = true;
                return true;
            }
            break;
        case CSSPropertyVerticalAlign:
            if (equalIgnoringCase(valueText, "sub")) {
                m_applySubscript = true;
                return true;
            }
            if (equalIgnoringCase(valueText, "super")) {
                m_applySuperscript = true;
                return true;
            }
            break;
        case CSSPropertyFontStyle:
            if (equalIgnoringCase(valueText, "italic") || equalIgnoringCase(valueText, "oblique")) {
                m_applyItalic = true;
                return true;
            }
            break;
        case CSSPropertyColor: {
            RGBA32 rgba = 0;
            CSSParser::parseColor(rgba, valueText);
            Color color(rgba);
            m_applyFontColor = color.name();
            return true;
        }
        case CSSPropertyFontFamily:
            m_applyFontFace = valueText;
            return true;
        case CSSPropertyFontSize:
            if (property->value()->cssValueType() == CSSValue::CSS_PRIMITIVE_VALUE) {
                CSSPrimitiveValue *value = static_cast<CSSPrimitiveValue *>(property->value());

                if (value->primitiveType() < CSSPrimitiveValue::CSS_PX || value->primitiveType() > CSSPrimitiveValue::CSS_PC)
                    // Size keyword or relative unit.
                    return false;

                float number = value->getFloatValue(CSSPrimitiveValue::CSS_PX);
                if (number <= 9)
                    m_applyFontSize = "1";
                else if (number <= 10)
                    m_applyFontSize = "2";
                else if (number <= 13)
                    m_applyFontSize = "3";
                else if (number <= 16)
                    m_applyFontSize = "4";
                else if (number <= 18)
                    m_applyFontSize = "5";
                else if (number <= 24)
                    m_applyFontSize = "6";
                else
                    m_applyFontSize = "7";
                // Huge quirk in Microsft Entourage is that they understand CSS font-size, but also write 
                // out legacy 1-7 values in font tags (I guess for mailers that are not CSS-savvy at all, 
                // like Eudora). Yes, they write out *both*. We need to write out both as well. Return false.
                return false; 
            }
            else {
                // Can't make sense of the number. Put no font size.
                return true;
            }
    }
    return false;
}

bool StyleChange::currentlyHasStyle(const Position &pos, const CSSProperty *property)
{
    ASSERT(pos.isNotNull());
    RefPtr<CSSComputedStyleDeclaration> style = pos.computedStyle();
    RefPtr<CSSValue> value = style->getPropertyCSSValue(property->id(), DoNotUpdateLayout);
    if (!value)
        return false;
    return equalIgnoringCase(value->cssText(), property->value()->cssText());
}

static String& styleSpanClassString()
{
    DEFINE_STATIC_LOCAL(String, styleSpanClassString, ((AppleStyleSpanClass)));
    return styleSpanClassString;
}

bool isStyleSpan(const Node *node)
{
    if (!node || !node->isHTMLElement())
        return false;

    const HTMLElement* elem = static_cast<const HTMLElement*>(node);
    return elem->hasLocalName(spanAttr) && elem->getAttribute(classAttr) == styleSpanClassString();
}

static bool isUnstyledStyleSpan(const Node* node)
{
    if (!node || !node->isHTMLElement() || !node->hasTagName(spanTag))
        return false;

    const HTMLElement* elem = static_cast<const HTMLElement*>(node);
    CSSMutableStyleDeclaration* inlineStyleDecl = elem->inlineStyleDecl();
    return (!inlineStyleDecl || inlineStyleDecl->length() == 0) && elem->getAttribute(classAttr) == styleSpanClassString();
}

static bool isSpanWithoutAttributesOrUnstyleStyleSpan(const Node* node)
{
    if (!node || !node->isHTMLElement() || !node->hasTagName(spanTag))
        return false;

    const HTMLElement* elem = static_cast<const HTMLElement*>(node);
    NamedAttrMap* attributes = elem->attributes(true); // readonly
    if (attributes->length() == 0)
        return true;

    return isUnstyledStyleSpan(node);
}

static bool isEmptyFontTag(const Node *node)
{
    if (!node || !node->hasTagName(fontTag))
        return false;

    const Element *elem = static_cast<const Element *>(node);
    NamedAttrMap *map = elem->attributes(true); // true for read-only
    return (!map || map->length() == 1) && elem->getAttribute(classAttr) == styleSpanClassString();
}

static PassRefPtr<Element> createFontElement(Document* document)
{
    RefPtr<Element> fontNode = createHTMLElement(document, fontTag);
    fontNode->setAttribute(classAttr, styleSpanClassString());
    return fontNode.release();
}

PassRefPtr<HTMLElement> createStyleSpanElement(Document* document)
{
    RefPtr<HTMLElement> styleElement = createHTMLElement(document, spanTag);
    styleElement->setAttribute(classAttr, styleSpanClassString());
    return styleElement.release();
}

ApplyStyleCommand::ApplyStyleCommand(Document* document, CSSStyleDeclaration* style, EditAction editingAction, EPropertyLevel propertyLevel)
    : CompositeEditCommand(document)
    , m_style(style->makeMutable())
    , m_editingAction(editingAction)
    , m_propertyLevel(propertyLevel)
    , m_start(endingSelection().start().downstream())
    , m_end(endingSelection().end().upstream())
    , m_useEndingSelection(true)
    , m_styledInlineElement(0)
    , m_removeOnly(false)
{
}

ApplyStyleCommand::ApplyStyleCommand(Document* document, CSSStyleDeclaration* style, const Position& start, const Position& end, EditAction editingAction, EPropertyLevel propertyLevel)
    : CompositeEditCommand(document)
    , m_style(style->makeMutable())
    , m_editingAction(editingAction)
    , m_propertyLevel(propertyLevel)
    , m_start(start)
    , m_end(end)
    , m_useEndingSelection(false)
    , m_styledInlineElement(0)
    , m_removeOnly(false)
{
}

ApplyStyleCommand::ApplyStyleCommand(PassRefPtr<Element> element, bool removeOnly, EditAction editingAction)
    : CompositeEditCommand(element->document())