xmlsyntaxhighlighter.cpp Example File | Qt WebKit Examples 5.5

- Qt 5.5
- Qt WebKit Examples
- QObject XML Model Example
- xmlsyntaxhighlighter.cpp Example File
- Qt 5.5.1 Reference Documentation

# xmlsyntaxhighlighter.cpp Example File

webkitwidgets/xmlpatterns/qobjectxmlmodel/xmlsyntaxhighlighter.cpp

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    #include "xmlsyntaxhighlighter.h"

    XmlSyntaxHighlighter::XmlSyntaxHighlighter(QTextDocument *parent)
        : QSyntaxHighlighter(parent)
    {
        HighlightingRule rule;

        // tag format
        tagFormat.setForeground(Qt::darkBlue);
        tagFormat.setFontWeight(QFont::Bold);
        rule.pattern = QRegExp("(<[a-zA-Z:]+\\b|<\\?[a-zA-Z:]+\\b|\\?>|>|/>|</[a-zA-Z:]+>)");
        rule.format = tagFormat;
        highlightingRules.append(rule);

        // attribute format
        attributeFormat.setForeground(Qt::darkGreen);
        rule.pattern = QRegExp("[a-zA-Z:]+=");
        rule.format = attributeFormat;
        highlightingRules.append(rule);

        // attribute content format
        attributeContentFormat.setForeground(Qt::red);
        rule.pattern = QRegExp("(\"[^\"]*\"|'[^']*')");
        rule.format = attributeContentFormat;
        highlightingRules.append(rule);

        commentFormat.setForeground(Qt::lightGray);
        commentFormat.setFontItalic(true);

        commentStartExpression = QRegExp("<!--");
        commentEndExpression = QRegExp("-->");
    }

    void XmlSyntaxHighlighter::highlightBlock(const QString &text)
    {
         foreach (const HighlightingRule &rule, highlightingRules) {
             QRegExp expression(rule.pattern);
             int index = text.indexOf(expression);
             while (index >= 0) {
                 int length = expression.matchedLength();
                 setFormat(index, length, rule.format);
                 index = text.indexOf(expression, index + length);
             }
         }
         setCurrentBlockState(0);

         int startIndex = 0;
         if (previousBlockState() != 1)
             startIndex = text.indexOf(commentStartExpression);

         while (startIndex >= 0) {
             int endIndex = text.indexOf(commentEndExpression, startIndex);
             int commentLength;
             if (endIndex == -1) {
                 setCurrentBlockState(1);
                 commentLength = text.length() - startIndex;
             } else {
                 commentLength = endIndex - startIndex
                                 + commentEndExpression.matchedLength();
             }
             setFormat(startIndex, commentLength, commentFormat);
             startIndex = text.indexOf(commentStartExpression,
                                                     startIndex + commentLength);
         }
    }