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134 lines
4.1 KiB
C++
134 lines
4.1 KiB
C++
/**
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* \file LaTeXHighlighter.cpp
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Bo Peng
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*
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* Full author contact details are available in file CREDITS.
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*/
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#include <config.h>
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#include "LaTeXHighlighter.h"
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#include "qt_helpers.h"
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#include <QString>
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#include <QTextDocument>
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namespace lyx {
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namespace frontend {
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LaTeXHighlighter::LaTeXHighlighter(QTextDocument * parent, bool at_letter)
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: QSyntaxHighlighter(parent), at_letter_(at_letter)
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{
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auto blend = [](QColor color1, QColor color2) {
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int r = 0.5 * (color1.red() + color2.red());
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int g = 0.5 * (color1.green() + color2.green());
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int b = 0.5 * (color1.blue() + color2.blue());
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return QColor(r, g, b);
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};
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QPalette palette = QPalette();
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QColor text_color = palette.color(QPalette::Active, QPalette::Text);
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keywordFormat.setForeground(blend(Qt::blue, text_color));
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keywordFormat.setFontWeight(QFont::Bold);
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commentFormat.setForeground(palette.color(QPalette::Disabled,
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QPalette::Text));
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mathFormat.setForeground(blend(Qt::red, text_color));
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warningFormat.setForeground(Qt::red);
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warningFormat.setFontWeight(QFont::Bold);
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}
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void LaTeXHighlighter::highlightBlock(QString const & text)
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{
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// $ $
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static const QRegExp exprMath("\\$[^\\$]*\\$");
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int index = exprMath.indexIn(text);
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while (index >= 0) {
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int length = exprMath.matchedLength();
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setFormat(index, length, mathFormat);
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index = exprMath.indexIn(text, index + length);
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}
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// [ ]
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static const QRegExp exprStartDispMath("(\\\\\\[|"
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"\\\\begin\\{equation\\**\\}|"
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"\\\\begin\\{eqnarray\\**\\}|"
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"\\\\begin\\{align(ed|at)*\\**\\}|"
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"\\\\begin\\{flalign\\**\\}|"
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"\\\\begin\\{gather\\**\\}|"
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"\\\\begin\\{multline\\**\\}|"
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"\\\\begin\\{array\\**\\}|"
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"\\\\begin\\{cases\\**\\}"
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")");
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static const QRegExp exprEndDispMath("(\\\\\\]|"
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"\\\\end\\{equation\\**\\}|"
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"\\\\end\\{eqnarray\\**\\}|"
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"\\\\end\\{align(ed|at)*\\**\\}|"
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"\\\\end\\{flalign\\**\\}|"
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"\\\\end\\{gather\\**\\}|"
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"\\\\end\\{multline\\**\\}|"
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"\\\\end\\{array\\**\\}|"
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"\\\\end\\{cases\\**\\}"
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")");
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int startIndex = 0;
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// if previous block was in 'disp math'
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// start search from 0 (for end disp math)
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// otherwise, start search from 'begin disp math'
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if (previousBlockState() != 1)
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startIndex = exprStartDispMath.indexIn(text);
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while (startIndex >= 0) {
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int endIndex = exprEndDispMath.indexIn(text, startIndex);
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int length;
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if (endIndex == -1) {
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setCurrentBlockState(1);
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length = text.length() - startIndex;
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} else {
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length = endIndex - startIndex + exprEndDispMath.matchedLength();
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}
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setFormat(startIndex, length, mathFormat);
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startIndex = exprStartDispMath.indexIn(text, startIndex + length);
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}
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// \whatever
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static const QRegExp exprKeywordAtOther("\\\\[A-Za-z]+");
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// \wh@tever
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static const QRegExp exprKeywordAtLetter("\\\\[A-Za-z@]+");
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QRegExp const & exprKeyword = at_letter_ ? exprKeywordAtLetter
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: exprKeywordAtOther;
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index = exprKeyword.indexIn(text);
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while (index >= 0) {
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int length = exprKeyword.matchedLength();
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setFormat(index, length, keywordFormat);
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index = exprKeyword.indexIn(text, index + length);
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}
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// %comment
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// Treat a line as a comment starting at a percent sign
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// * that is the first character in a line
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// * that is preceded by
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// ** an even number of backslashes
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// ** any character other than a backslash
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QRegExp exprComment("(?:^|[^\\\\])(?:\\\\\\\\)*(%).*$");
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exprComment.indexIn(text);
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index = exprComment.pos(1);
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while (index >= 0) {
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int const length = exprComment.matchedLength()
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- (index - exprComment.pos(0));
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setFormat(index, length, commentFormat);
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exprComment.indexIn(text, index + length);
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index = exprComment.pos(1);
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}
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// <LyX Warning: ...>
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QString lyxwarn = qt_("LyX Warning: ");
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QRegExp exprWarning("<" + lyxwarn + "[^<]*>");
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index = exprWarning.indexIn(text);
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while (index >= 0) {
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int length = exprWarning.matchedLength();
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setFormat(index, length, warningFormat);
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index = exprWarning.indexIn(text, index + length);
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}
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}
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} // namespace frontend
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} // namespace lyx
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