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/*
TikZiT - a GUI diagram editor for TikZ
Copyright (C) 2018 Aleks Kissinger
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/*!
* A string validator which keeps curly braces matched. Used in various places
* to ensure the user doesn't make non-parseable .tikz or .tikzstyles files.
*
* Its validation function will return Acceptable if all curly braces are matched
* properly, Intermediate if all braces are matched except for possibly some opening
* curly braces, and Invalid if there are unmatched closing curly braces.
*/
#ifndef DELIMITEDSTRINGVALIDATOR_H
#define DELIMITEDSTRINGVALIDATOR_H
#include <QObject>
#include <QValidator>
class DelimitedStringValidator : public QValidator
{
Q_OBJECT
public:
DelimitedStringValidator(QObject *parent);
QValidator::State validate(QString &input, int &/*pos*/) const override;
/*!
* \brief fixup adds curly braces until all braces are matched (if possible)
* \param input
*/
void fixup(QString &input) const override;
private:
/*!
* \brief braceDepth computes the final (non-escaped) curly-brace depth of a given string
* \param input a string
* \return the final brace depth, or -1 if the depth *ever* drops below 0
*/
int braceDepth(QString input) const;
};
#endif // DELIMITEDSTRINGVALIDATOR_H
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