HexStringValidator.cpp

/*
 * Copyright (C) 2006 - 2025 Evan Teran <evan.teran@gmail.com>
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "HexStringValidator.h"

#include <QString>

#include <cctype> // for std::isxdigit

/**
 * @brief Constructor for the HexStringValidator class.
 *
 * @param parent The parent object.
 */
HexStringValidator::HexStringValidator(QObject *parent)
	: QValidator(parent) {
}

/**
 * @brief
 */
void HexStringValidator::fixup(QString &input) const {
	QString temp;
	int index = 0;

	for (QChar ch : input) {
		const int c = ch.toLatin1();
		if (c < 0x80 && std::isxdigit(c)) {

			if (index != 0 && (index & 1) == 0) {
				temp += ' ';
			}

			temp += ch.toUpper();
			++index;
		}
	}

	input = temp;
}

/**
 * @brief
 */
QValidator::State HexStringValidator::validate(QString &input, int &pos) const {
	if (!input.isEmpty()) {
		// TODO: can we detect if the char which was JUST deleted
		// (if any was deleted) was a space? and special case this?
		// as to not have the minor bug in this case?

		const qsizetype char_pos = pos - input.left(pos).count(' ');
		int chars                = 0;
		fixup(input);

		pos = 0;

		while (pos < input.size() && chars != char_pos) {
			if (input[pos] != ' ') {
				++chars;
			}
			++pos;
		}

		if (pos < input.size()) {

			// favor the right side of a space
			if (input[pos] == ' ') {
				++pos;
			}
		}
	}
	return QValidator::Acceptable;
}