labs-edaf30/lab1/editor.cc

#include "editor.h"

#include <string>

using std::string;

using size_type = Editor::size_type;

size_type Editor::get_size() const
{
    return text.size();
}

size_type Editor::find_left_par(size_type pos) const {
    if (pos >= text.size() || (text[pos] != ')' && text[pos] != ']' && text[pos] != '}')) {
        return std::string::npos;
    }

    char right_par = text[pos];
    char left_par = (right_par == ')') ? '(' : (right_par == ']') ? '[' : '{';

    int balance = 0;

    for (int i = pos; i >= 0; --i) {
        if (text[i] == right_par) {
            balance++;
        } else if (text[i] == left_par) {
            balance--;
            if (balance == 0) {
                return i;
            }
        }
    }
}