xmlsyntaxhighlighter.cpp

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#include "xmlsyntaxhighlighter.h"

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

  // tag format
  tagFormat.setForeground( QColor( 70, 70, 110 ) );
  //tagFormat.setFontWeight(QFont::Bold);
  rule.pattern = QRegExp( "(<[a-zA-Z0-9_:]+\\b|<\\?[a-zA-Z0-9_:]+\\b|\\?>|>|/>|</[a-zA-Z0-9_:]+>)" );
  rule.format = tagFormat;
  highlightingRules.append( rule );

  // attribute format
  attributeFormat.setForeground( QColor( 160, 10, 10 ) );
  rule.pattern = QRegExp( "[a-zA-Z0-9_:]+=" );
  rule.format = attributeFormat;
  highlightingRules.append( rule );

  // attribute content format
  attributeContentFormat.setForeground( QColor( 160, 10, 130 ) );
  rule.pattern = QRegExp( "(\"[^\"]*\"|'[^']*')" );
  rule.format = attributeContentFormat;
  highlightingRules.append( rule );

  commentFormat.setForeground( QColor( 30, 130, 0 ) );
  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 );
  }
}