xmlsyntaxhighlighter.cpp Example File | Qt WebKit Examples 5.9

Qt 5.9 | Qt WebKit Examples | QObject XML Model Example | xmlsyntaxhighlighter.cpp Example File

Qt 5.9.2 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);
           }
      }