htmltableelement.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) 1997 Martin Jones ([e-mail])
 *           (C) 1997 Torben Weis ([e-mail])
 *           (C) 1998 Waldo Bastian ([e-mail])
 *           (C) 1999 Lars Knoll ([e-mail])
 *           (C) 1999 Antti Koivisto ([e-mail])
 * Copyright (C) 2003, 2004, 2005, 2006, 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 "HTMLTableElement.h"

#include "CSSPropertyNames.h"
#include "CSSStyleSheet.h"
#include "CSSValueKeywords.h"
#include "ExceptionCode.h"
#include "HTMLNames.h"
#include "HTMLTableCaptionElement.h"
#include "HTMLTableRowsCollection.h"
#include "HTMLTableRowElement.h"
#include "HTMLTableSectionElement.h"
#include "RenderTable.h"
#include "Text.h"

namespace WebCore {

using namespace HTMLNames;

HTMLTableElement::HTMLTableElement(const QualifiedName& tagName, Document* doc)
    : HTMLElement(tagName, doc)
    , m_borderAttr(false)
    , m_borderColorAttr(false)
    , m_frameAttr(false)
    , m_rulesAttr(UnsetRules)
    , m_padding(1)
{
    ASSERT(hasTagName(tableTag));
}

bool HTMLTableElement::checkDTD(const Node* newChild)
{
    if (newChild->isTextNode())
        return static_cast<const Text*>(newChild)->containsOnlyWhitespace();
    return newChild->hasTagName(captionTag) ||
           newChild->hasTagName(colTag) || newChild->hasTagName(colgroupTag) ||
           newChild->hasTagName(theadTag) || newChild->hasTagName(tfootTag) ||
           newChild->hasTagName(tbodyTag) || newChild->hasTagName(formTag) ||
           newChild->hasTagName(scriptTag);
}

HTMLTableCaptionElement* HTMLTableElement::caption() const
{
    for (Node* child = firstChild(); child; child = child->nextSibling()) {
        if (child->hasTagName(captionTag))
            return static_cast<HTMLTableCaptionElement*>(child);
    }
    return 0;
}

void HTMLTableElement::setCaption(PassRefPtr<HTMLTableCaptionElement> newCaption, ExceptionCode& ec)
{
    deleteCaption();
    insertBefore(newCaption, firstChild(), ec);
}

HTMLTableSectionElement* HTMLTableElement::tHead() const
{
    for (Node* child = firstChild(); child; child = child->nextSibling()) {
        if (child->hasTagName(theadTag))
            return static_cast<HTMLTableSectionElement*>(child);
    }
    return 0;
}

void HTMLTableElement::setTHead(PassRefPtr<HTMLTableSectionElement> newHead, ExceptionCode& ec)
{
    deleteTHead();

    Node* child;
    for (child = firstChild(); child; child = child->nextSibling())
        if (child->isElementNode() && !child->hasTagName(captionTag) && !child->hasTagName(colgroupTag))
            break;

    insertBefore(newHead, child, ec);
}

HTMLTableSectionElement* HTMLTableElement::tFoot() const
{
    for (Node* child = firstChild(); child; child = child->nextSibling()) {
        if (child->hasTagName(tfootTag))
            return static_cast<HTMLTableSectionElement*>(child);
    }
    return 0;
}

void HTMLTableElement::setTFoot(PassRefPtr<HTMLTableSectionElement> newFoot, ExceptionCode& ec)
{
    deleteTFoot();

    Node* child;
    for (child = firstChild(); child; child = child->nextSibling())
        if (child->isElementNode() && !child->hasTagName(captionTag) && !child->hasTagName(colgroupTag) && !child->hasTagName(theadTag))
            break;

    insertBefore(newFoot, child, ec);
}

PassRefPtr<HTMLElement> HTMLTableElement::createTHead()
{
    if (HTMLTableSectionElement* existingHead = tHead())
        return existingHead;
    RefPtr<HTMLTableSectionElement> head = new HTMLTableSectionElement(theadTag, document());
    ExceptionCode ec;
    setTHead(head, ec);
    return head.release();
}

void HTMLTableElement::deleteTHead()
{
    ExceptionCode ec;
    removeChild(tHead(), ec);
}

PassRefPtr<HTMLElement> HTMLTableElement::createTFoot()
{
    if (HTMLTableSectionElement* existingFoot = tFoot())
        return existingFoot;
    RefPtr<HTMLTableSectionElement> foot = new HTMLTableSectionElement(tfootTag, document());
    ExceptionCode ec;
    setTFoot(foot, ec);
    return foot.release();
}

void HTMLTableElement::deleteTFoot()
{
    ExceptionCode ec;
    removeChild(tFoot(), ec);
}

PassRefPtr<HTMLElement> HTMLTableElement::createCaption()
{
    if (HTMLTableCaptionElement* existingCaption = caption())
        return existingCaption;
    RefPtr<HTMLTableCaptionElement> caption = new HTMLTableCaptionElement(captionTag, document());
    ExceptionCode ec;
    setCaption(caption, ec);
    return caption.release();
}

void HTMLTableElement::deleteCaption()
{
    ExceptionCode ec;
    removeChild(caption(), ec);
}

HTMLTableSectionElement* HTMLTableElement::lastBody() const
{
    for (Node* child = lastChild(); child; child = child->previousSibling()) {
        if (child->hasTagName(tbodyTag))
            return static_cast<HTMLTableSectionElement*>(child);
    }
    return 0;
}

PassRefPtr<HTMLElement> HTMLTableElement::insertRow(int index, ExceptionCode& ec)
{
    if (index < -1) {
        ec = INDEX_SIZE_ERR;
        return 0;
    }

    HTMLTableRowElement* lastRow = 0;
    HTMLTableRowElement* row = 0;
    if (index == -1)
        lastRow = HTMLTableRowsCollection::lastRow(this);
    else {
        for (int i = 0; i <= index; ++i) {
            row = HTMLTableRowsCollection::rowAfter(this, lastRow);
            if (!row) {
                if (i != index) {
                    ec = INDEX_SIZE_ERR;
                    return 0;
                }
                break;
            }
            lastRow = row;
        }
    }

    Node* parent;
    if (lastRow)
        parent = row ? row->parent() : lastRow->parent();
    else {
        parent = lastBody();
        if (!parent) {
            RefPtr<HTMLTableSectionElement> newBody = new HTMLTableSectionElement(tbodyTag, document());
            RefPtr<HTMLTableRowElement> newRow = new HTMLTableRowElement(trTag, document());
            newBody->appendChild(newRow, ec);
            appendChild(newBody.release(), ec);
            return newRow.release();
        }
    }

    RefPtr<HTMLTableRowElement> newRow = new HTMLTableRowElement(trTag, document());
    parent->insertBefore(newRow, row, ec);
    return newRow.release();
}

void HTMLTableElement::deleteRow(int index, ExceptionCode& ec)
{
    HTMLTableRowElement* row = 0;
    if (index == -1)
        row = HTMLTableRowsCollection::lastRow(this);
    else {
        for (int i = 0; i <= index; ++i) {
            row = HTMLTableRowsCollection::rowAfter(this, row);
            if (!row)
                break;
        }
    }
    if (!row) {
        ec = INDEX_SIZE_ERR;
        return;
    }
    row->remove(ec);
}

ContainerNode* HTMLTableElement::addChild(PassRefPtr<Node> child)
{
    if (child->hasTagName(formTag)) {
        // First add the child.
        HTMLElement::addChild(child);

        // Now simply return ourselves as the container to insert into.
        // This has the effect of demoting the form to a leaf and moving it safely out of the way.
        return this;
    }

    return HTMLElement::addChild(child.get());
}

bool HTMLTableElement::mapToEntry(const QualifiedName& attrName, MappedAttributeEntry& result) const
{
    if (attrName == backgroundAttr) {
        result = (MappedAttributeEntry)(eLastEntry + document()->docID());
        return false;
    }
    
    if (attrName == widthAttr ||
        attrName == heightAttr ||
        attrName == bgcolorAttr ||
        attrName == cellspacingAttr ||
        attrName == vspaceAttr ||
        attrName == hspaceAttr ||
        attrName == valignAttr) {
        result = eUniversal;
        return false;
    }
    
    if (attrName == bordercolorAttr || attrName == frameAttr || attrName == rulesAttr) {
        result = eUniversal;
        return true;
    }
    
    if (attrName == borderAttr) {
        result = eTable;
        return true;
    }
    
    if (attrName == alignAttr) {
        result = eTable;
        return false;
    }

    return HTMLElement::mapToEntry(attrName, result);
}

static inline bool isTableCellAncestor(Node* n)
{
    return n->hasTagName(theadTag) || n->hasTagName(tbodyTag) ||
           n->hasTagName(tfootTag) || n->hasTagName(trTag) ||
           n->hasTagName(thTag);
}

static bool setTableCellsChanged(Node* n)
{
    ASSERT(n);
    bool cellChanged = false;

    if (n->hasTagName(tdTag))
        cellChanged = true;
    else if (isTableCellAncestor(n)) {
        for (Node* child = n->firstChild(); child; child = child->nextSibling())
            cellChanged |= setTableCellsChanged(child);
    }

    if (cellChanged)
       n->setChanged();

    return cellChanged;
}

void HTMLTableElement::parseMappedAttribute(MappedAttribute* attr)
{
    CellBorders bordersBefore = cellBorders();
    unsigned short oldPadding = m_padding;

    if (attr->name() == widthAttr)
        addCSSLength(attr, CSSPropertyWidth, attr->value());
    else if (attr->name() == heightAttr)
        addCSSLength(attr, CSSPropertyHeight, attr->value());
    else if (attr->name() == borderAttr)  {
        m_borderAttr = true;
        if (attr->decl()) {
            RefPtr<CSSValue> val = attr->decl()->getPropertyCSSValue(CSSPropertyBorderLeftWidth);
            if (val && val->isPrimitiveValue()) {
                CSSPrimitiveValue* primVal = static_cast<CSSPrimitiveValue*>(val.get());
                m_borderAttr = primVal->getDoubleValue(CSSPrimitiveValue::CSS_NUMBER);
            }
        } else if (!attr->isNull()) {
            int border = 0;
            if (attr->isEmpty())
                border = 1;
            else
                border = attr->value().toInt();
            m_borderAttr = border;
            addCSSLength(attr, CSSPropertyBorderWidth, String::number(border));
        }
    } else if (attr->name() == bgcolorAttr)
        addCSSColor(attr, CSSPropertyBackgroundColor, attr->value());
    else if (attr->name() == bordercolorAttr) {
        m_borderColorAttr = attr->decl();
        if (!attr->decl() && !attr->isEmpty()) {
            addCSSColor(attr, CSSPropertyBorderColor, attr->value());
            m_borderColorAttr = true;
        }
    } else if (attr->name() == backgroundAttr) {
        String url = parseURL(attr->value());
        if (!url.isEmpty())
            addCSSImageProperty(attr, CSSPropertyBackgroundImage, document()->completeURL(url).string());
    } else if (attr->name() == frameAttr) {
        // Cache the value of "frame" so that the table can examine it later.
        m_frameAttr = false;
        
        // Whether or not to hide the top/right/bottom/left borders.
        const int cTop = 0;
        const int cRight = 1;
        const int cBottom = 2;
        const int cLeft = 3;
        bool borders[4] = { false, false, false, false };
        
        // void, above, below, hsides, vsides, lhs, rhs, box, border
        if (equalIgnoringCase(attr->value(), "void"))
            m_frameAttr = true;
        else if (equalIgnoringCase(attr->value(), "above")) {
            m_frameAttr = true;
            borders[cTop] = true;
        } else if (equalIgnoringCase(attr->value(), "below")) {
            m_frameAttr = true;
            borders[cBottom] = true;
        } else if (equalIgnoringCase(attr->value(), "hsides")) {
            m_frameAttr = true;
            borders[cTop] = borders[cBottom] = true;
        } else if (equalIgnoringCase(attr->value(), "vsides")) {
            m_frameAttr = true;