//  ParserState.cpp
//
//  Copyright (C) 2025  Jaye Evins <evins@snaught.com>
//
//  This file is part of gLabels-qt.
//
//  gLabels-qt 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.
//
//  gLabels-qt 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 gLabels-qt.  If not, see <http://www.gnu.org/licenses/>.
//


#include "ParserState.hpp"

#include <algorithm>


namespace glabels::model
{

        ParserState::ParserState( const QString& string,
                                  qsizetype      pos )
                : mString(&string),
                  mPos( pos )
        {
        }


        QChar
        ParserState::operator[]( qsizetype i ) const
        {
                auto ii = mPos + i;
                if ( ii < mString->size() )
                {
                        return (*mString)[ii];
                }
                else
                {
                        return '\0';
                }
        }


        bool
        ParserState::isNextSubString( const QString& s ) const
        {
                for ( qsizetype i = 0; i < s.size(); i++ )
                {
                        if ( operator[](i) != s[i] ) return false;
                }
                return true;
        }


        qsizetype
        ParserState::pos() const
        {
                return mPos;
        }


        qsizetype
        ParserState::charsLeft() const
        {
                return std::max( mString->size() - mPos, qsizetype(0) );
        }


        void
        ParserState::advanceChars( qsizetype i )
        {
                mPos = std::min( mPos + i, mString->size() );
        }

}
