138 lines
3.5 KiB
C++
138 lines
3.5 KiB
C++
/*
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* Copyright (C) 2013-2016 Max Kellermann <max.kellermann@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef ITERABLE_SPLIT_STRING_HXX
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#define ITERABLE_SPLIT_STRING_HXX
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#include "StringView.hxx"
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#include <iterator>
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/**
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* Split a string at a certain separator character into sub strings
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* and allow iterating over the segments.
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*
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* Two consecutive separator characters result in an empty string.
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*
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* An empty input string returns one empty string.
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*/
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template<typename T>
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class BasicIterableSplitString {
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typedef BasicStringView<T> StringView;
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typedef typename StringView::value_type value_type;
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StringView s;
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value_type separator;
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public:
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constexpr BasicIterableSplitString(StringView _s,
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value_type _separator)
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:s(_s), separator(_separator) {}
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class Iterator final {
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friend class BasicIterableSplitString;
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StringView current, rest;
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value_type separator;
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Iterator(StringView _s, value_type _separator)
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:rest(_s), separator(_separator) {
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Next();
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}
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constexpr Iterator(std::nullptr_t n)
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:current(n), rest(n), separator(0) {}
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void Next() {
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if (rest == nullptr)
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current = nullptr;
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else {
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const auto *i = rest.Find(separator);
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if (i == nullptr) {
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current = rest;
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rest.data = nullptr;
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} else {
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current.data = rest.data;
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current.size = i - current.data;
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rest.size -= current.size + 1;
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rest.data = i + 1;
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}
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}
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}
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public:
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typedef std::forward_iterator_tag iterator_category;
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Iterator &operator++() {
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Next();
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return *this;
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}
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constexpr bool operator==(Iterator other) const {
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return current.data == other.current.data;
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}
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constexpr bool operator!=(Iterator other) const {
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return !(*this == other);
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}
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constexpr StringView operator*() const {
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return current;
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}
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constexpr const StringView *operator->() const {
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return ¤t;
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}
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};
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typedef Iterator iterator;
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typedef Iterator const_iterator;
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const_iterator begin() const {
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return {s, separator};
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}
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constexpr const_iterator end() const {
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return {nullptr};
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}
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};
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using IterableSplitString = BasicIterableSplitString<char>;
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#ifdef _UNICODE
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using WIterableSplitString = BasicIterableSplitString<wchar_t>;
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using TIterableSplitString = WIterableSplitString;
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#else
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using TIterableSplitString = IterableSplitString;
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#endif
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#endif
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