File indexing completed on 2024-04-28 07:29:26

 /*
     KmPlot - a math. function plotter for the KDE-Desktop
 
     SPDX-FileCopyrightText: 2006 David Saxton <david@bluehaze.org>
 
     This file is part of the KDE Project.
     KmPlot is part of the KDE-EDU Project.
 
     SPDX-License-Identifier: GPL-2.0-or-later
 
 */
 
 #include "equationhighlighter.h"
 
 #include <QLocale>
 
 #include "equationedit.h"
 #include "equationeditwidget.h"
 #include "xparser.h"
 
 EquationHighlighter::EquationHighlighter(EquationEdit *parent)
     : QSyntaxHighlighter(parent->m_equationEditWidget)
     , m_parent(parent)
 {
     m_errorPosition = -1;
 }
 
 EquationHighlighter::~EquationHighlighter()
 {
 }
 
 void EquationHighlighter::highlightBlock(const QString &text)
 {
     m_parent->checkTextValidity();
 
     if (text.isEmpty())
         return;
 
     QTextCharFormat number;
     QTextCharFormat function;
     QTextCharFormat variable;
     QTextCharFormat matchedParenthesis;
 
     QPalette palette;
     if (qGray(palette.color(QPalette::Base).rgb()) > 160) {
         // Good color defaults borrowed from Abakus - thanks! :)
         number.setForeground(QColor(0, 0, 127));
         function.setForeground(QColor(85, 0, 0));
         variable.setForeground(QColor(0, 85, 0));
         matchedParenthesis.setBackground(QColor(255, 255, 183));
     } else {
         number.setForeground(QColor(160, 160, 255));
         function.setForeground(QColor(255, 160, 160));
         variable.setForeground(QColor(160, 255, 160));
         matchedParenthesis.setBackground(QColor(85, 85, 0));
     }
 
     QTextCharFormat other;
 
     const QStringList variables = m_parent->m_equation->variables();
     const QStringList functions = XParser::self()->predefinedFunctions(true) + XParser::self()->userFunctions();
 
     for (int i = 0; i < text.length(); ++i) {
         QString remaining = text.right(text.length() - i);
 
         bool found = false;
 
         for (const QString &var : variables) {
             if (remaining.startsWith(var)) {
                 setFormat(i, var.length(), variable);
                 i += var.length() - 1;
                 found = true;
                 break;
             }
         }
         if (found)
             continue;
 
         for (const QString &f : functions) {
             if (remaining.startsWith(f)) {
                 setFormat(i, f.length(), function);
                 i += f.length() - 1;
                 found = true;
                 break;
             }
         }
         if (found)
             continue;
 
         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);
     }
 
     // BEGIN highlight matched brackets
     int cursorPos = m_parent->m_equationEditWidget->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] == '(' || text[cursorPos - 1] == ')'))
         cursorPos--;
 
     bool haveOpen = text[cursorPos] == '(';
     bool haveClose = text[cursorPos] == ')';
 
     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] == ')')
                 level--;
             else if (text[i] == '(')
                 level++;
 
             if (level == 0) {
                 // Matched!
                 setFormat(cursorPos, 1, matchedParenthesis);
                 setFormat(i, 1, matchedParenthesis);
                 break;
             }
         }
     }
     // END highlight matched brackets
 
     if (m_errorPosition != -1) {
         QTextCharFormat error;
         error.setForeground(Qt::red);
 
         setFormat(m_errorPosition, 1, error);
     }
 }
 
 void EquationHighlighter::setErrorPosition(int position)
 {
     m_errorPosition = position;
 }