qtexthtmlparser.cpp

奇趣公司比较新的qt/emd版本

void QTextHtmlParser::applyAttributes(const QStringList &attributes)
{
    // local state variable for qt3 textedit mode
    bool seenQt3Richtext = false;
    QString linkHref;
    QString linkType;

    if (attributes.count() % 2 == 1)
        return;

    QTextHtmlParserNode *node = &nodes.last();

    for (int i = 0; i < attributes.count(); i += 2) {
        QString key = attributes.at(i);
        QString value = attributes.at(i + 1);

        switch (node->id) {
            case Html_font:
                // the infamous font tag
                if (key == QLatin1String("size") && value.size()) {
                    int n = value.toInt();
                    if (value.at(0) != QLatin1Char('+') && value.at(0) != QLatin1Char('-'))
                        n -= 3;
                    node->charFormat.setProperty(QTextFormat::FontSizeAdjustment, n);
                } else if (key == QLatin1String("face")) {
                    node->charFormat.setFontFamily(value);
                } else if (key == QLatin1String("color")) {
                    QColor c; c.setNamedColor(value);
                    node->charFormat.setForeground(c);
                }
                break;
            case Html_ol:
            case Html_ul:
                if (key == QLatin1String("type")) {
                    node->hasOwnListStyle = true;
                    if (value == QLatin1String("1")) {
                        node->listStyle = QTextListFormat::ListDecimal;
                    } else if (value == QLatin1String("a")) {
                        node->listStyle = QTextListFormat::ListLowerAlpha;
                    } else if (value == QLatin1String("A")) {
                        node->listStyle = QTextListFormat::ListUpperAlpha;
                    } else {
                        value = value.toLower();
                        if (value == QLatin1String("square"))
                            node->listStyle = QTextListFormat::ListSquare;
                        else if (value == QLatin1String("disc"))
                            node->listStyle = QTextListFormat::ListDisc;
                        else if (value == QLatin1String("circle"))
                            node->listStyle = QTextListFormat::ListCircle;
                    }
                }
                break;
            case Html_a:
                if (key == QLatin1String("href"))
                    node->charFormat.setAnchorHref(value);
                else if (key == QLatin1String("name"))
                    node->charFormat.setAnchorName(value);
                break;
            case Html_img:
                if (key == QLatin1String("src") || key == QLatin1String("source")) {
                    node->imageName = value;
                } else if (key == QLatin1String("width")) {
                    setFloatAttribute(&node->imageWidth, value);
                } else if (key == QLatin1String("height")) {
                    setFloatAttribute(&node->imageHeight, value);
                }
                break;
            case Html_tr:
            case Html_body:
                if (key == QLatin1String("bgcolor")) {
                    QColor c; c.setNamedColor(value);
                    node->charFormat.setBackground(c);
                }
                break;
            case Html_th:
            case Html_td:
                if (key == QLatin1String("width")) {
                    setWidthAttribute(&node->width, value);
                } else if (key == QLatin1String("bgcolor")) {
                    QColor c; c.setNamedColor(value);
                    node->charFormat.setBackground(c);
                } else if (key == QLatin1String("rowspan")) {
                    if (setIntAttribute(&node->tableCellRowSpan, value))
                        node->tableCellRowSpan = qMax(1, node->tableCellRowSpan);
                } else if (key == QLatin1String("colspan")) {
                    if (setIntAttribute(&node->tableCellColSpan, value))
                        node->tableCellColSpan = qMax(1, node->tableCellColSpan);
                }
                break;
            case Html_table:
                if (key == QLatin1String("border")) {
                    setFloatAttribute(&node->tableBorder, value);
                } else if (key == QLatin1String("bgcolor")) {
                    QColor c; c.setNamedColor(value);
                    node->charFormat.setBackground(c);
                } else if (key == QLatin1String("cellspacing")) {
                    setFloatAttribute(&node->tableCellSpacing, value);
                } else if (key == QLatin1String("cellpadding")) {
                    setFloatAttribute(&node->tableCellPadding, value);
                } else if (key == QLatin1String("width")) {
                    setWidthAttribute(&node->width, value);
                } else if (key == QLatin1String("height")) {
                    setWidthAttribute(&node->height, value);
                }
                break;
            case Html_meta:
                if (key == QLatin1String("name")
                    && value == QLatin1String("qrichtext")) {
                    seenQt3Richtext = true;
                }

                if (key == QLatin1String("content")
                    && value == QLatin1String("1")
                    && seenQt3Richtext) {

                    textEditMode = true;
                }
                break;
            case Html_hr:
                if (key == QLatin1String("width"))
                    setWidthAttribute(&node->width, value);
                break;
            case Html_link:
                if (key == QLatin1String("href"))
                    linkHref = value;
                else if (key == QLatin1String("type"))
                    linkType = value;
                break;
            default:
                break;
        }

        if (key == QLatin1String("style")) {
            node->parseStyleAttribute(value, resourceProvider);
        } else if (key == QLatin1String("align")) {
            value = value.toLower();
            bool alignmentSet = true;

            if (value == QLatin1String("left"))
                node->blockFormat.setAlignment(Qt::AlignLeft|Qt::AlignAbsolute);
            else if (value == QLatin1String("right"))
                node->blockFormat.setAlignment(Qt::AlignRight|Qt::AlignAbsolute);
            else if (value == QLatin1String("center"))
                node->blockFormat.setAlignment(Qt::AlignHCenter);
            else if (value == QLatin1String("justify"))
                node->blockFormat.setAlignment(Qt::AlignJustify);
            else
                alignmentSet = false;

            if (node->id == Html_img) {
                // HTML4 compat
                if (alignmentSet) {
                    if (node->blockFormat.alignment() & Qt::AlignLeft)
                        node->cssFloat = QTextFrameFormat::FloatLeft;
                    else if (node->blockFormat.alignment() & Qt::AlignRight)
                        node->cssFloat = QTextFrameFormat::FloatRight;
                } else if (value == QLatin1String("middle")) {
                    node->charFormat.setVerticalAlignment(QTextCharFormat::AlignMiddle);
                } else if (value == QLatin1String("top")) {
                    node->charFormat.setVerticalAlignment(QTextCharFormat::AlignTop);
                }
            }
        } else if (key == QLatin1String("valign")) {
            value = value.toLower();
            if (value == QLatin1String("top"))
                node->charFormat.setVerticalAlignment(QTextCharFormat::AlignTop);
            else if (value == QLatin1String("middle"))
                node->charFormat.setVerticalAlignment(QTextCharFormat::AlignMiddle);
            else if (value == QLatin1String("bottom"))
                node->charFormat.setVerticalAlignment(QTextCharFormat::AlignBottom);
        } else if (key == QLatin1String("dir")) {
            value = value.toLower();
            if (value == QLatin1String("ltr"))
                node->blockFormat.setLayoutDirection(Qt::LeftToRight);
            else if (value == QLatin1String("rtl"))
                node->blockFormat.setLayoutDirection(Qt::RightToLeft);
        } else if (key == QLatin1String("title")) {
            node->charFormat.setToolTip(value);
        } else if (key == QLatin1String("id")) {
            node->charFormat.setAnchor(true);
            node->charFormat.setAnchorName(value);
        }
    }

    if (resourceProvider && !linkHref.isEmpty() && linkType == QLatin1String("text/css"))
        importStyleSheet(linkHref);
}

class QTextHtmlStyleSelector : public QCss::StyleSelector
{
public:
    inline QTextHtmlStyleSelector(const QTextHtmlParser *parser)
        : parser(parser) {}

    virtual bool nodeNameEquals(NodePtr node, const QString& name) const;
    virtual QString attribute(NodePtr node, const QString &name) const;
    virtual bool hasAttribute(NodePtr node, const QString &name) const;
    virtual bool hasAttributes(NodePtr node) const;
    virtual bool isNullNode(NodePtr node) const;
    virtual NodePtr parentNode(NodePtr node) const;
    virtual NodePtr previousSiblingNode(NodePtr node) const;
    virtual NodePtr duplicateNode(NodePtr node) const;
    virtual void freeNode(NodePtr node) const;

private:
    const QTextHtmlParser *parser;
};

bool QTextHtmlStyleSelector::nodeNameEquals(NodePtr node, const QString& name) const
{
    return QString::compare(parser->at(node.id).tag, name, Qt::CaseInsensitive) == 0;
}

static inline int findAttribute(const QStringList &attributes, const QString &name)
{
    int idx = -1;
    do {
        idx = attributes.indexOf(name, idx + 1);
    } while (idx != -1 && (idx % 2 == 1));
    return idx;
}

QString QTextHtmlStyleSelector::attribute(NodePtr node, const QString &name) const
{
    const QStringList &attributes = parser->at(node.id).attributes;
    const int idx = findAttribute(attributes, name);
    if (idx == -1)
        return QString();
    return attributes.at(idx + 1);
}

bool QTextHtmlStyleSelector::hasAttribute(NodePtr node, const QString &name) const
{
   const QStringList &attributes = parser->at(node.id).attributes;
   return findAttribute(attributes, name) != -1;
}

bool QTextHtmlStyleSelector::hasAttributes(NodePtr node) const
{
   const QStringList &attributes = parser->at(node.id).attributes;
   return !attributes.isEmpty();
}

bool QTextHtmlStyleSelector::isNullNode(NodePtr node) const
{
    return node.id == 0;
}

QCss::StyleSelector::NodePtr QTextHtmlStyleSelector::parentNode(NodePtr node) const
{
    NodePtr parent;
    parent.id = 0;
    if (node.id) {
        parent.id = parser->at(node.id).parent;
    }
    return parent;
}

QCss::StyleSelector::NodePtr QTextHtmlStyleSelector::duplicateNode(NodePtr node) const
{
    return node;
}

QCss::StyleSelector::NodePtr QTextHtmlStyleSelector::previousSiblingNode(NodePtr node) const
{
    NodePtr sibling;
    sibling.id = 0;
    if (!node.id)
        return sibling;
    int parent = parser->at(node.id).parent;
    if (!parent)
        return sibling;
    const int childIdx = parser->at(parent).children.indexOf(node.id);
    if (childIdx <= 0)
        return sibling;
    sibling.id = parser->at(parent).children.at(childIdx - 1);
    return sibling;
}

void QTextHtmlStyleSelector::freeNode(NodePtr) const
{
}

void QTextHtmlParser::resolveStyleSheetImports(const QCss::StyleSheet &sheet)
{
    for (int i = 0; i < sheet.importRules.count(); ++i) {
        const QCss::ImportRule &rule = sheet.importRules.at(i);
        if (rule.media.isEmpty()
            || rule.media.contains(QLatin1String("screen"), Qt::CaseInsensitive))
            importStyleSheet(rule.href);
    }
}

void QTextHtmlParser::importStyleSheet(const QString &href)
{
    if (!resourceProvider)
        return;
    for (int i = 0; i < externalStyleSheets.count(); ++i)
        if (externalStyleSheets.at(i).url == href)
            return;

    QVariant res = resourceProvider->resource(QTextDocument::StyleSheetResource, href);
    QString css;
    if (res.type() == QVariant::String) {
        css = res.toString();
    } else if (res.type() == QVariant::ByteArray) {
        // #### detect @charset
        css = QString::fromUtf8(res.toByteArray());
    }
    if (!css.isEmpty()) {
        QCss::Parser parser(css);
        QCss::StyleSheet sheet;
        parser.parse(&sheet);
        externalStyleSheets.append(ExternalStyleSheet(href, sheet));
        resolveStyleSheetImports(sheet);
    }
}

QVector<QCss::Declaration> QTextHtmlParser::declarationsForNode(int node) const
{
    QVector<QCss::Declaration> decls;

    QTextHtmlStyleSelector selector(this);

    int idx = 0;
    selector.styleSheets.resize((resourceProvider ? 1 : 0)
                                + externalStyleSheets.count()
                                + inlineStyleSheets.count());
    if (resourceProvider)
        selector.styleSheets[idx++] = resourceProvider->docHandle()->parsedDefaultStyleSheet;

    for (int i = 0; i < externalStyleSheets.count(); ++i, ++idx)
        selector.styleSheets[idx] = externalStyleSheets.at(i).sheet;

    for (int i = 0; i < inlineStyleSheets.count(); ++i, ++idx)
        selector.styleSheets[idx] = inlineStyleSheets.at(i);

    selector.medium = QLatin1String("screen");

    QCss::StyleSelector::NodePtr n;
    n.id = node;

    const char *extraPseudo = 0;
    if (nodes.at(node).id == Html_a && nodes.at(node).hasHref)
        extraPseudo = "link";
    decls = selector.declarationsForNode(n, extraPseudo);

    return decls;
}

bool QTextHtmlParser::nodeIsChildOf(int i, QTextHTMLElements id) const
{
    while (i) {
        if (at(i).id == id)
            return true;
        i = at(i).parent;
    }
    return false;
}