File indexing completed on 2024-05-05 03:48:22

 /*
     File             : EquationHighlighter.h
     Project          : LabPlot
     Description      : syntax highligher for mathematical equations
     --------------------------------------------------------------------
     SPDX-FileCopyrightText: 2014 Alexander Semke <alexander.semke@web.de>
     SPDX-FileCopyrightText: 2006 David Saxton <david@bluehaze.org>
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #include "EquationHighlighter.h"
 #include "backend/gsl/ExpressionParser.h"
 
 #include <KTextEdit>
 #include <QPalette>
 
 EquationHighlighter::EquationHighlighter(KTextEdit* parent)
     : QSyntaxHighlighter(parent)
     , m_parent(parent)
 //  m_errorPosition = -1
 {
 }
 
 void EquationHighlighter::setVariables(const QStringList& variables) {
     m_variables = variables;
     rehighlight();
 }
 
 void EquationHighlighter::highlightBlock(const QString& text) {
     // TODO: m_parent->checkTextValidity();
 
     if (text.isEmpty())
         return;
 
     QTextCharFormat number;
     QTextCharFormat function;
     QTextCharFormat variable;
     QTextCharFormat constant;
     QTextCharFormat matchedParenthesis;
 
     QPalette palette;
     if (qGray(palette.color(QPalette::Base).rgb()) > 160) { // light
         number.setForeground(QColor(0, 0, 127));
         function.setForeground(QColor(85, 0, 0));
         function.setFontWeight(QFont::Bold);
         variable.setForeground(QColor(0, 85, 0));
         constant.setForeground(QColor(85, 0, 0));
         matchedParenthesis.setBackground(QColor(255, 255, 183));
     } else { // dark
         number.setForeground(QColor(160, 160, 255));
         function.setForeground(QColor(255, 160, 160));
         function.setFontWeight(QFont::Bold);
         variable.setForeground(QColor(160, 255, 160));
         constant.setForeground(QColor(255, 160, 160));
         matchedParenthesis.setBackground(QColor(85, 85, 0));
     }
 
     QTextCharFormat other;
 
     static const QStringList& functions = ExpressionParser::getInstance()->functions();
     static const QStringList& constants = ExpressionParser::getInstance()->constants();
 
     for (int i = 0; i < text.length(); ++i) {
         QString remaining = text.right(text.length() - i);
         bool found = false;
 
         // variables
         for (const QString& var : m_variables) {
             if (remaining.startsWith(var)) {
                 QString nextChar = remaining.mid(var.length(), 1);
                 if (nextChar == QLatin1Char(' ') || nextChar == QLatin1Char(')') || nextChar == QLatin1Char('+') || nextChar == QLatin1Char('-')
                     || nextChar == QLatin1Char('*') || nextChar == QLatin1Char('/') || nextChar == QLatin1Char('^')) {
                     setFormat(i, var.length(), variable);
                     i += var.length() - 1;
                     found = true;
                     break;
                 }
             }
         }
         if (found)
             continue;
 
         // functions
         for (const QString& f : functions) {
             if (remaining.startsWith(f)) {
                 setFormat(i, f.length(), function);
                 i += f.length() - 1;
                 found = true;
                 break;
             }
         }
         if (found)
             continue;
 
         // constants
         for (const QString& f : constants) {
             if (remaining.startsWith(f)) {
                 setFormat(i, f.length(), function);
                 i += f.length() - 1;
                 found = true;
                 break;
             }
         }
         if (found)
             continue;
 
         // TODO
         /*
         ushort u = text[i].unicode();
         bool isFraction = (u >= 0xbc && u <= 0xbe) || (u >= 0x2153 && u <= 0x215e);
         bool isPower = (u >= 0xb2 && u <= 0xb3) || (u == 0x2070) || (u >= 0x2074 && u <= 0x2079);
         bool isDigit = text[i].isDigit();
         bool isDecimalPoint = text[i] == QLocale().decimalPoint();
 
         if (isFraction || isPower || isDigit || isDecimalPoint)
             setFormat(i, 1, number);
         else
             setFormat(i, 1, other);
         */
     }
 
     // highlight matched brackets
     int cursorPos = m_parent->textCursor().position();
     if (cursorPos < 0)
         cursorPos = 0;
 
     // Adjust cursorpos to allow for a bracket before the cursor position
     if (cursorPos >= text.size())
         cursorPos = text.size() - 1;
     else if (cursorPos > 0 && (text[cursorPos - 1] == QLatin1Char('(') || text[cursorPos - 1] == QLatin1Char(')')))
         cursorPos--;
 
     bool haveOpen = text[cursorPos] == QLatin1Char('(');
     bool haveClose = text[cursorPos] == QLatin1Char(')');
 
     if ((haveOpen || haveClose) && m_parent->hasFocus()) {
         // Search for the other bracket
 
         int inc = haveOpen ? 1 : -1; // which direction to search in
 
         int level = 0;
         for (int i = cursorPos; i >= 0 && i < text.size(); i += inc) {
             if (text[i] == QLatin1Char(')'))
                 level--;
             else if (text[i] == QLatin1Char('('))
                 level++;
 
             if (level == 0) {
                 // Matched!
                 setFormat(cursorPos, 1, matchedParenthesis);
                 setFormat(i, 1, matchedParenthesis);
                 break;
             }
         }
     }
 
     // TODO: highlight the position of the error
     //  if (m_errorPosition != -1) {
     //      QTextCharFormat error;
     //      error.setForeground(Qt::red);
     //
     //      setFormat(m_errorPosition, 1, error);
     //  }
 }
 
 void EquationHighlighter::rehighlight() {
     setDocument(nullptr);
     setDocument(m_parent->document());
 }
 
 /**
  * This is used to indicate the position where the error occurred.
  * If \p position is negative, then no error will be shown.
  */
 // void EquationHighlighter::setErrorPosition(int position) {
 //  m_errorPosition = position;
 // }