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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);

     }

}