141 lines
3.7 KiB
C++
141 lines
3.7 KiB
C++
/*
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* Copyright (C) 2013-2017 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 STRING_VIEW_HXX
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#define STRING_VIEW_HXX
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#include "ConstBuffer.hxx"
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#include <string.h>
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struct StringView : ConstBuffer<char> {
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StringView() = default;
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constexpr StringView(pointer_type _data, size_type _size) noexcept
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:ConstBuffer<char>(_data, _size) {}
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constexpr StringView(pointer_type _begin, pointer_type _end) noexcept
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:ConstBuffer<char>(_begin, _end - _begin) {}
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StringView(pointer_type _data) noexcept
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:ConstBuffer<char>(_data,
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_data != nullptr ? strlen(_data) : 0) {}
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constexpr StringView(std::nullptr_t n) noexcept
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:ConstBuffer<char>(n) {}
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static constexpr StringView Empty() noexcept {
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return StringView("", size_t(0));
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}
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template<size_t n>
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static constexpr StringView Literal(const char (&_data)[n]) noexcept {
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static_assert(n > 0, "");
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return {_data, n - 1};
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}
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static constexpr StringView Literal() noexcept {
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return StringView("", size_t(0));
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}
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void SetEmpty() noexcept {
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data = "";
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size = 0;
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}
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gcc_pure
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pointer_type Find(char ch) const noexcept {
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return (pointer_type)memchr(data, ch, size);
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}
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StringView &operator=(std::nullptr_t) noexcept {
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data = nullptr;
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size = 0;
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return *this;
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}
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StringView &operator=(pointer_type _data) noexcept {
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data = _data;
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size = _data != nullptr ? strlen(_data) : 0;
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return *this;
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}
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gcc_pure
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bool StartsWith(StringView needle) const noexcept {
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return size >= needle.size &&
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memcmp(data, needle.data, needle.size) == 0;
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}
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gcc_pure
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bool EndsWith(StringView needle) const noexcept {
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return size >= needle.size &&
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memcmp(data + size - needle.size,
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needle.data, needle.size) == 0;
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}
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gcc_pure
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bool Equals(StringView other) const noexcept {
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return size == other.size &&
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memcmp(data, other.data, size) == 0;
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}
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template<size_t n>
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bool EqualsLiteral(const char (&other)[n]) const noexcept {
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return Equals(Literal(other));
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}
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gcc_pure
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bool EqualsIgnoreCase(StringView other) const noexcept {
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return size == other.size &&
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strncasecmp(data, other.data, size) == 0;
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}
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template<size_t n>
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bool EqualsLiteralIgnoreCase(const char (&other)[n]) const noexcept {
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return EqualsIgnoreCase(Literal(other));
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}
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/**
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* Skip all whitespace at the beginning.
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*/
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void StripLeft() noexcept;
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/**
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* Skip all whitespace at the end.
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*/
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void StripRight() noexcept;
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void Strip() noexcept {
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StripLeft();
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StripRight();
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}
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};
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#endif
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