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 <config.h>
  12
  13 #include "LaTeXHighlighter.h"
  14 #include "qt_helpers.h"
  15
  16 #include <QString>
  17 #include <QTextDocument>
  18
  19 namespace lyx {
  20 namespace frontend {
  21
  22 LaTeXHighlighter::LaTeXHighlighter(QTextDocument * parent)
  23         : QSyntaxHighlighter(parent)
  24 {
  25         keywordFormat.setForeground(Qt::darkBlue);
  26         keywordFormat.setFontWeight(QFont::Bold);
  27         commentFormat.setForeground(Qt::darkGray);
  28         mathFormat.setForeground(Qt::red);
  29         warningFormat.setForeground(Qt::red);
  30         warningFormat.setFontWeight(QFont::Bold);
  31 }
  32
  33
  34 void LaTeXHighlighter::highlightBlock(QString const & text)
  35 {
  36         // $ $
  37         static const QRegExp exprMath("\\$[^\\$]*\\$");
  38         int index = text.indexOf(exprMath);
  39         while (index >= 0) {
  40                 int length = exprMath.matchedLength();
  41                 setFormat(index, length, mathFormat);
  42                 index = text.indexOf(exprMath, index + length);
  43         }
  44         // [ ]
  45         static const QRegExp exprStartDispMath("(\\\\\\[|"
  46                 "\\\\begin\\{equation\\**\\}|"
  47                 "\\\\begin\\{eqnarray\\**\\}|"
  48                 "\\\\begin\\{align(ed|at)*\\**\\}|"
  49                 "\\\\begin\\{flalign\\**\\}|"
  50                 "\\\\begin\\{gather\\**\\}|"
  51                 "\\\\begin\\{multline\\**\\}|"
  52                 "\\\\begin\\{array\\**\\}|"
  53                 "\\\\begin\\{cases\\**\\}"
  54                 ")");
  55         static const QRegExp exprEndDispMath("(\\\\\\]|"
  56                 "\\\\end\\{equation\\**\\}|"
  57                 "\\\\end\\{eqnarray\\**\\}|"
  58                 "\\\\end\\{align(ed|at)*\\**\\}|"
  59                 "\\\\end\\{flalign\\**\\}|"
  60                 "\\\\end\\{gather\\**\\}|"
  61                 "\\\\end\\{multline\\**\\}|"
  62                 "\\\\end\\{array\\**\\}|"
  63                 "\\\\end\\{cases\\**\\}"
  64                 ")");
  65         int startIndex = 0;
  66         // if previous block was in 'disp math'
  67         // start search from 0 (for end disp math)
  68         // otherwise, start search from 'begin disp math'
  69         if (previousBlockState() != 1)
  70                 startIndex = text.indexOf(exprStartDispMath);
  71         while (startIndex >= 0) {
  72                 int endIndex = text.indexOf(exprEndDispMath, startIndex);
  73                 int length;
  74                 if (endIndex == -1) {
  75                         setCurrentBlockState(1);
  76                         length = text.length() - startIndex;
  77                 } else {
  78                         length = endIndex - startIndex + exprEndDispMath.matchedLength();
  79                 }
  80                 setFormat(startIndex, length, mathFormat);
  81                 startIndex = text.indexOf(exprStartDispMath, startIndex + length);
  82         }
  83         // \whatever
  84         static const QRegExp exprKeyword("\\\\[A-Za-z]+");
  85         index = text.indexOf(exprKeyword);
  86         while (index >= 0) {
  87                 int length = exprKeyword.matchedLength();
  88                 setFormat(index, length, keywordFormat);
  89                 index = text.indexOf(exprKeyword, index + length);
  90         }
  91         // %comment
  92         // Treat a line as a comment starting at a percent sign
  93         // * that is the first character in a line
  94         // * that is preceded by
  95         // ** an even number of backslashes
  96         // ** any character other than a backslash
  97         QRegExp exprComment("(?:^|[^\\\\])(?:\\\\\\\\)*(%).*$");
  98         text.indexOf(exprComment);
  99         index = exprComment.pos(1);
 100         while (index >= 0) {
 101                 int const length = exprComment.matchedLength()
 102                                  - (index - exprComment.pos(0));
 103                 setFormat(index, length, commentFormat);
 104                 text.indexOf(exprComment, index + length);
 105                 index = exprComment.pos(1);
 106         }
 107         // <LyX Warning: ...>
 108         QString lyxwarn = qt_("LyX Warning: ");
 109         QRegExp exprWarning("<" + lyxwarn + "[^<]*>");
 110         index = text.indexOf(exprWarning);
 111         while (index >= 0) {
 112                 int length = exprWarning.matchedLength();
 113                 setFormat(index, length, warningFormat);
 114                 index = text.indexOf(exprWarning, index + length);
 115         }
 116 }
 117
 118 } // namespace frontend
 119 } // namespace lyx