afb81b8278
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67 lines
1.5 KiB
C++
67 lines
1.5 KiB
C++
// This file is part of Desktop App Toolkit,
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// a set of libraries for developing nice desktop applications.
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//
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// For license and copyright information please follow this link:
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// https://github.com/desktop-app/legal/blob/master/LEGAL
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//
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#pragma once
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#include <QtCore/QString>
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namespace base {
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namespace details {
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struct ContainerImplHelper {
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enum CutResult { Null, Empty, Full, Subset };
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static constexpr CutResult mid(
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qsizetype originalLength,
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qsizetype *_position,
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qsizetype *_length) {
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qsizetype &position = *_position;
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qsizetype &length = *_length;
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if (position > originalLength) {
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position = 0;
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length = 0;
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return Null;
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}
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if (position < 0) {
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if (length < 0 || length + position >= originalLength) {
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position = 0;
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length = originalLength;
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return Full;
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}
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if (length + position <= 0) {
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position = length = 0;
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return Null;
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}
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length += position;
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position = 0;
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} else if (size_t(length) > size_t(originalLength - position)) {
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length = originalLength - position;
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}
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if (position == 0 && length == originalLength)
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return Full;
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return length > 0 ? Subset : Empty;
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}
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};
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} // namespace details
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[[nodiscard]] inline QStringView StringViewMid(
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QStringView view,
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qsizetype pos,
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qsizetype n = -1) {
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const auto result = details::ContainerImplHelper::mid(
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view.size(),
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&pos,
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&n);
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return (result == details::ContainerImplHelper::Null)
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? QStringView()
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: view.mid(pos, n);
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}
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} // namespace base
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