src/frontends/qt4/QViewSource.cpp

   1 /**
   2  * \file QViewSource.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 "QViewSource.h"
  16 #include "qt_helpers.h"
  17
  18 #include <boost/tuple/tuple.hpp>
  19
  20 #include <QTextCursor>
  21 #include <QTextDocument>
  22
  23 namespace lyx {
  24 namespace frontend {
  25
  26 /////////////////////////////////////////////////////////////////////
  27 //
  28 // QViewSourceDialog
  29 //
  30 /////////////////////////////////////////////////////////////////////
  31
  32 QViewSourceDialog::QViewSourceDialog(QViewSource * form)
  33         : form_(form)
  34 {
  35         setupUi(this);
  36
  37         connect(viewFullSourceCB, SIGNAL(clicked()),
  38                 this, SLOT(update()));
  39         connect(autoUpdateCB, SIGNAL(toggled(bool)),
  40                 updatePB, SLOT(setDisabled(bool)));
  41         connect(updatePB, SIGNAL(clicked()),
  42                 this, SLOT(update()));
  43
  44         // setting a document at this point trigger an assertion in Qt
  45         // so we disable the signals here:
  46         form_->document()->blockSignals(true);
  47         viewSourceTV->setDocument(form_->document());
  48         form_->document()->blockSignals(false);
  49         viewSourceTV->setReadOnly(true);
  50         ///dialog_->viewSourceTV->setAcceptRichText(false);
  51         // this is personal. I think source code should be in fixed-size font
  52         QFont font(toqstr(theApp()->typewriterFontName()));
  53         font.setKerning(false);
  54         font.setFixedPitch(true);
  55         font.setStyleHint(QFont::TypeWriter);
  56         viewSourceTV->setFont(font);
  57         // again, personal taste
  58         viewSourceTV->setWordWrapMode(QTextOption::NoWrap);
  59 }
  60
  61
  62 void QViewSourceDialog::update()
  63 {
  64         if (autoUpdateCB->isChecked())
  65                 form_->update(viewFullSourceCB->isChecked());
  66
  67         int beg, end;
  68         boost::tie(beg, end) = form_->getRows();
  69         QTextCursor c = QTextCursor(viewSourceTV->document());
  70         c.movePosition(QTextCursor::NextBlock, QTextCursor::MoveAnchor, beg);
  71         c.select(QTextCursor::BlockUnderCursor);
  72         c.movePosition(QTextCursor::NextBlock, QTextCursor::KeepAnchor, end - beg + 1);
  73         viewSourceTV->setTextCursor(c);
  74         QWidget::update();
  75 }
  76
  77
  78 /////////////////////////////////////////////////////////////////////
  79 //
  80 // LaTeXHighlighter
  81 //
  82 /////////////////////////////////////////////////////////////////////
  83
  84
  85 LaTeXHighlighter::LaTeXHighlighter(QTextDocument * parent)
  86         : QSyntaxHighlighter(parent)
  87 {
  88         keywordFormat.setForeground(Qt::darkBlue);
  89         keywordFormat.setFontWeight(QFont::Bold);
  90         commentFormat.setForeground(Qt::darkGray);
  91         mathFormat.setForeground(Qt::red);
  92 }
  93
  94
  95 void LaTeXHighlighter::highlightBlock(QString const & text)
  96 {
  97         // $ $
  98         QRegExp exprMath("\\$[^\\$]*\\$");
  99         int index = text.indexOf(exprMath);
 100         while (index >= 0) {
 101                 int length = exprMath.matchedLength();
 102                 setFormat(index, length, mathFormat);
 103                 index = text.indexOf(exprMath, index + length);
 104         }
 105         // [ ]
 106         QRegExp exprStartDispMath("(\\\\\\[|"
 107                 "\\\\begin\\{equation\\**\\}|"
 108                 "\\\\begin\\{eqnarray\\**\\}|"
 109                 "\\\\begin\\{align(ed|at)*\\**\\}|"
 110                 "\\\\begin\\{flalign\\**\\}|"
 111                 "\\\\begin\\{gather\\**\\}|"
 112                 "\\\\begin\\{multline\\**\\}|"
 113                 "\\\\begin\\{array\\**\\}|"
 114                 "\\\\begin\\{cases\\**\\}"
 115                 ")");
 116         QRegExp exprEndDispMath("(\\\\\\]|"
 117                 "\\\\end\\{equation\\**\\}|"
 118                 "\\\\end\\{eqnarray\\**\\}|"
 119                 "\\\\end\\{align(ed|at)*\\**\\}|"
 120                 "\\\\end\\{flalign\\**\\}|"
 121                 "\\\\end\\{gather\\**\\}|"
 122                 "\\\\end\\{multline\\**\\}|"
 123                 "\\\\end\\{array\\**\\}|"
 124                 "\\\\end\\{cases\\**\\}"
 125                 ")");
 126         int startIndex = 0;
 127         // if previous block was in 'disp math'
 128         // start search from 0 (for end disp math)
 129         // otherwise, start search from 'begin disp math'
 130         if (previousBlockState() != 1)
 131                 startIndex = text.indexOf(exprStartDispMath);
 132         while (startIndex >= 0) {
 133                 int endIndex = text.indexOf(exprEndDispMath, startIndex);
 134                 int length;
 135                 if (endIndex == -1) {
 136                         setCurrentBlockState(1);
 137                         length = text.length() - startIndex;
 138                 } else {
 139                         length = endIndex - startIndex + exprEndDispMath.matchedLength();
 140                 }
 141                 setFormat(startIndex, length, mathFormat);
 142                 startIndex = text.indexOf(exprStartDispMath, startIndex + length);
 143         }
 144         // \whatever
 145         QRegExp exprKeyword("\\\\[A-Za-z]+");
 146         index = text.indexOf(exprKeyword);
 147         while (index >= 0) {
 148                 int length = exprKeyword.matchedLength();
 149                 setFormat(index, length, keywordFormat);
 150                 index = text.indexOf(exprKeyword, index + length);
 151         }
 152         // comment
 153         QRegExp exprComment("(^|[^\\\\])%.*$");
 154         index = text.indexOf(exprComment);
 155         while (index >= 0) {
 156                 int const length = exprComment.matchedLength();
 157                 setFormat(index, length, commentFormat);
 158                 index = text.indexOf(exprComment, index + length);
 159         }
 160 }
 161
 162
 163 QViewSource::QViewSource(Dialog & parent)
 164         : ControlViewSource(parent)
 165 {
 166         document_ = new QTextDocument(this);
 167         highlighter_ = new LaTeXHighlighter(document_);
 168 }
 169
 170
 171 /////////////////////////////////////////////////////////////////////
 172 //
 173 // QViewSource
 174 //
 175 /////////////////////////////////////////////////////////////////////
 176
 177 void QViewSource::update(bool full_source)
 178 {
 179         document_->setPlainText(toqstr(updateContent(full_source)));
 180 }
 181
 182
 183 } // namespace frontend
 184 } // namespace lyx
 185
 186 #include "QViewSource_moc.cpp"