src/frontends/qt4/LaTeXHighlighter.cpp

   1 /**
   2  * \file LaTeXHighlighter.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Bo Peng
   7  *
   8  * Full author contact details are available in file CREDITS.
   9  */
  10
  11 #include "LaTeXHighlighter.h"
  12
  13 #include <QString>
  14 #include <QTextDocument>
  15
  16 namespace lyx {
  17 namespace frontend {
  18
  19 LaTeXHighlighter::LaTeXHighlighter(QTextDocument * parent)
  20         : QSyntaxHighlighter(parent)
  21 {
  22         keywordFormat.setForeground(Qt::darkBlue);
  23         keywordFormat.setFontWeight(QFont::Bold);
  24         commentFormat.setForeground(Qt::darkGray);
  25         mathFormat.setForeground(Qt::red);
  26 }
  27
  28
  29 void LaTeXHighlighter::highlightBlock(QString const & text)
  30 {
  31         // $ $
  32         static const QRegExp exprMath("\\$[^\\$]*\\$");
  33         int index = text.indexOf(exprMath);
  34         while (index >= 0) {
  35                 int length = exprMath.matchedLength();
  36                 setFormat(index, length, mathFormat);
  37                 index = text.indexOf(exprMath, index + length);
  38         }
  39         // [ ]
  40         static const QRegExp exprStartDispMath("(\\\\\\[|"
  41                 "\\\\begin\\{equation\\**\\}|"
  42                 "\\\\begin\\{eqnarray\\**\\}|"
  43                 "\\\\begin\\{align(ed|at)*\\**\\}|"
  44                 "\\\\begin\\{flalign\\**\\}|"
  45                 "\\\\begin\\{gather\\**\\}|"
  46                 "\\\\begin\\{multline\\**\\}|"
  47                 "\\\\begin\\{array\\**\\}|"
  48                 "\\\\begin\\{cases\\**\\}"
  49                 ")");
  50         static const QRegExp exprEndDispMath("(\\\\\\]|"
  51                 "\\\\end\\{equation\\**\\}|"
  52                 "\\\\end\\{eqnarray\\**\\}|"
  53                 "\\\\end\\{align(ed|at)*\\**\\}|"
  54                 "\\\\end\\{flalign\\**\\}|"
  55                 "\\\\end\\{gather\\**\\}|"
  56                 "\\\\end\\{multline\\**\\}|"
  57                 "\\\\end\\{array\\**\\}|"
  58                 "\\\\end\\{cases\\**\\}"
  59                 ")");
  60         int startIndex = 0;
  61         // if previous block was in 'disp math'
  62         // start search from 0 (for end disp math)
  63         // otherwise, start search from 'begin disp math'
  64         if (previousBlockState() != 1)
  65                 startIndex = text.indexOf(exprStartDispMath);
  66         while (startIndex >= 0) {
  67                 int endIndex = text.indexOf(exprEndDispMath, startIndex);
  68                 int length;
  69                 if (endIndex == -1) {
  70                         setCurrentBlockState(1);
  71                         length = text.length() - startIndex;
  72                 } else {
  73                         length = endIndex - startIndex + exprEndDispMath.matchedLength();
  74                 }
  75                 setFormat(startIndex, length, mathFormat);
  76                 startIndex = text.indexOf(exprStartDispMath, startIndex + length);
  77         }
  78         // \whatever
  79         static const QRegExp exprKeyword("\\\\[A-Za-z]+");
  80         index = text.indexOf(exprKeyword);
  81         while (index >= 0) {
  82                 int length = exprKeyword.matchedLength();
  83                 setFormat(index, length, keywordFormat);
  84                 index = text.indexOf(exprKeyword, index + length);
  85         }
  86         // comment
  87         static const QRegExp exprComment("(^|[^\\\\])%.*$");
  88         index = text.indexOf(exprComment);
  89         while (index >= 0) {
  90                 int const length = exprComment.matchedLength();
  91                 setFormat(index, length, commentFormat);
  92                 index = text.indexOf(exprComment, index + length);
  93         }
  94 }
  95
  96 } // namespace frontend
  97 } // namespace lyx