src/frontends/qt4/GuiViewSource.cpp

   1 /**
   2  * \file GuiViewSource.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author John Levon
   7  * \author Bo Peng
   8  * \author Abdelrazak Younes
   9  *
  10  * Full author contact details are available in file CREDITS.
  11  */
  12
  13 #include <config.h>
  14
  15 #include "GuiViewSource.h"
  16 #include "qt_helpers.h"
  17
  18 #include <boost/tuple/tuple.hpp>
  19
  20 #include <QTextCursor>
  21 #include <QTextDocument>
  22
  23
  24 namespace lyx {
  25 namespace frontend {
  26
  27 GuiViewSourceDialog::GuiViewSourceDialog(ControlViewSource & controller)
  28         :       controller_(controller), document_(new QTextDocument(this)),
  29                 highlighter_(new LaTeXHighlighter(document_))
  30 {
  31         setupUi(this);
  32
  33         connect(viewFullSourceCB, SIGNAL(clicked()),
  34                 this, SLOT(update()));
  35         connect(autoUpdateCB, SIGNAL(toggled(bool)),
  36                 updatePB, SLOT(setDisabled(bool)));
  37         connect(updatePB, SIGNAL(clicked()),
  38                 this, SLOT(update()));
  39
  40         // setting a document at this point trigger an assertion in Qt
  41         // so we disable the signals here:
  42         document()->blockSignals(true);
  43         viewSourceTV->setDocument(document());
  44         document()->blockSignals(false);
  45         viewSourceTV->setReadOnly(true);
  46         ///dialog_->viewSourceTV->setAcceptRichText(false);
  47         // this is personal. I think source code should be in fixed-size font
  48         QFont font(toqstr(theApp()->typewriterFontName()));
  49         font.setKerning(false);
  50         font.setFixedPitch(true);
  51         font.setStyleHint(QFont::TypeWriter);
  52         viewSourceTV->setFont(font);
  53         // again, personal taste
  54         viewSourceTV->setWordWrapMode(QTextOption::NoWrap);
  55 }
  56
  57
  58 void GuiViewSourceDialog::updateView()
  59 {
  60         if (autoUpdateCB->isChecked())
  61                 update(viewFullSourceCB->isChecked());
  62
  63         int beg, end;
  64         boost::tie(beg, end) = controller_.getRows();
  65         QTextCursor c = QTextCursor(viewSourceTV->document());
  66         c.movePosition(QTextCursor::NextBlock, QTextCursor::MoveAnchor, beg);
  67         c.select(QTextCursor::BlockUnderCursor);
  68         c.movePosition(QTextCursor::NextBlock, QTextCursor::KeepAnchor, end - beg + 1);
  69         viewSourceTV->setTextCursor(c);
  70         QWidget::update();
  71 }
  72
  73
  74 void GuiViewSourceDialog::update(bool full_source)
  75 {
  76         document_->setPlainText(toqstr(controller_.updateContent(full_source)));
  77 }
  78
  79
  80
  81 /////////////////////////////////////////////////////////////////////
  82 //
  83 // LaTeXHighlighter
  84 //
  85 /////////////////////////////////////////////////////////////////////
  86
  87
  88 LaTeXHighlighter::LaTeXHighlighter(QTextDocument * parent)
  89         : QSyntaxHighlighter(parent)
  90 {
  91         keywordFormat.setForeground(Qt::darkBlue);
  92         keywordFormat.setFontWeight(QFont::Bold);
  93         commentFormat.setForeground(Qt::darkGray);
  94         mathFormat.setForeground(Qt::red);
  95 }
  96
  97
  98 void LaTeXHighlighter::highlightBlock(QString const & text)
  99 {
 100         // $ $
 101         QRegExp exprMath("\\$[^\\$]*\\$");
 102         int index = text.indexOf(exprMath);
 103         while (index >= 0) {
 104                 int length = exprMath.matchedLength();
 105                 setFormat(index, length, mathFormat);
 106                 index = text.indexOf(exprMath, index + length);
 107         }
 108         // [ ]
 109         QRegExp exprStartDispMath("(\\\\\\[|"
 110                 "\\\\begin\\{equation\\**\\}|"
 111                 "\\\\begin\\{eqnarray\\**\\}|"
 112                 "\\\\begin\\{align(ed|at)*\\**\\}|"
 113                 "\\\\begin\\{flalign\\**\\}|"
 114                 "\\\\begin\\{gather\\**\\}|"
 115                 "\\\\begin\\{multline\\**\\}|"
 116                 "\\\\begin\\{array\\**\\}|"
 117                 "\\\\begin\\{cases\\**\\}"
 118                 ")");
 119         QRegExp exprEndDispMath("(\\\\\\]|"
 120                 "\\\\end\\{equation\\**\\}|"
 121                 "\\\\end\\{eqnarray\\**\\}|"
 122                 "\\\\end\\{align(ed|at)*\\**\\}|"
 123                 "\\\\end\\{flalign\\**\\}|"
 124                 "\\\\end\\{gather\\**\\}|"
 125                 "\\\\end\\{multline\\**\\}|"
 126                 "\\\\end\\{array\\**\\}|"
 127                 "\\\\end\\{cases\\**\\}"
 128                 ")");
 129         int startIndex = 0;
 130         // if previous block was in 'disp math'
 131         // start search from 0 (for end disp math)
 132         // otherwise, start search from 'begin disp math'
 133         if (previousBlockState() != 1)
 134                 startIndex = text.indexOf(exprStartDispMath);
 135         while (startIndex >= 0) {
 136                 int endIndex = text.indexOf(exprEndDispMath, startIndex);
 137                 int length;
 138                 if (endIndex == -1) {
 139                         setCurrentBlockState(1);
 140                         length = text.length() - startIndex;
 141                 } else {
 142                         length = endIndex - startIndex + exprEndDispMath.matchedLength();
 143                 }
 144                 setFormat(startIndex, length, mathFormat);
 145                 startIndex = text.indexOf(exprStartDispMath, startIndex + length);
 146         }
 147         // \whatever
 148         QRegExp exprKeyword("\\\\[A-Za-z]+");
 149         index = text.indexOf(exprKeyword);
 150         while (index >= 0) {
 151                 int length = exprKeyword.matchedLength();
 152                 setFormat(index, length, keywordFormat);
 153                 index = text.indexOf(exprKeyword, index + length);
 154         }
 155         // comment
 156         QRegExp exprComment("(^|[^\\\\])%.*$");
 157         index = text.indexOf(exprComment);
 158         while (index >= 0) {
 159                 int const length = exprComment.matchedLength();
 160                 setFormat(index, length, commentFormat);
 161                 index = text.indexOf(exprComment, index + length);
 162         }
 163 }
 164
 165
 166 } // namespace frontend
 167 } // namespace lyx
 168
 169 #include "GuiViewSource_moc.cpp"