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679 lines
20 KiB
C++
679 lines
20 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
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//
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// This code is licensed under the MIT License (MIT).
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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///////////////////////////////////////////////////////////////////////////////
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#pragma once
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#ifndef GSL_STRING_SPAN_H
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#define GSL_STRING_SPAN_H
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#include "gsl_assert.h"
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#include "gsl_util.h"
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#include "span.h"
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#include <cstring>
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#ifdef _MSC_VER
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// No MSVC does constexpr fully yet
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#pragma push_macro("constexpr")
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#define constexpr /* nothing */
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// VS 2013 workarounds
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#if _MSC_VER <= 1800
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#define GSL_MSVC_HAS_TYPE_DEDUCTION_BUG
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#define GSL_MSVC2013_ICE_WHEN_USING_DUMMY_TEMPLATE_PARAMETER
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#define GSL_MSVC2013_EQUAL_ALGORITHM_IS_NOT_CPP14
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// noexcept is not understood
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#ifndef GSL_THROW_ON_CONTRACT_VIOLATION
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#pragma push_macro("noexcept")
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#define noexcept /* nothing */
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#endif
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#endif // _MSC_VER <= 1800
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#endif // _MSC_VER
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// In order to test the library, we need it to throw exceptions that we can catch
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#ifdef GSL_THROW_ON_CONTRACT_VIOLATION
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#ifdef _MSC_VER
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#pragma push_macro("noexcept")
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#endif
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#define noexcept /* nothing */
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#endif // GSL_THROW_ON_CONTRACT_VIOLATION
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namespace gsl
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{
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//
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// czstring and wzstring
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//
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// These are "tag" typedef's for C-style strings (i.e. null-terminated character arrays)
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// that allow static analysis to help find bugs.
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//
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// There are no additional features/semantics that we can find a way to add inside the
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// type system for these types that will not either incur significant runtime costs or
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// (sometimes needlessly) break existing programs when introduced.
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//
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template<std::ptrdiff_t Extent = dynamic_range>
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using czstring = const char*;
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template<std::ptrdiff_t Extent = dynamic_range>
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using cwzstring = const wchar_t*;
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template<std::ptrdiff_t Extent = dynamic_range>
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using zstring = char*;
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template<std::ptrdiff_t Extent = dynamic_range>
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using wzstring = wchar_t*;
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//
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// ensure_sentinel()
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//
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// Provides a way to obtain an span from a contiguous sequence
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// that ends with a (non-inclusive) sentinel value.
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//
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// Will fail-fast if sentinel cannot be found before max elements are examined.
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//
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template<typename T, const T Sentinel>
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span<T, dynamic_range> ensure_sentinel(T* seq, std::ptrdiff_t max = PTRDIFF_MAX)
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{
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auto cur = seq;
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while ((cur - seq) < max && *cur != Sentinel) ++cur;
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Ensures(*cur == Sentinel);
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return{ seq, cur - seq };
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}
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//
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// ensure_z - creates a span for a czstring or cwzstring.
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// Will fail fast if a null-terminator cannot be found before
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// the limit of size_type.
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//
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template<typename T>
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inline span<T, dynamic_range> ensure_z(T* const & sz, std::ptrdiff_t max = PTRDIFF_MAX)
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{
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return ensure_sentinel<T, 0>(sz, max);
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}
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// TODO (neilmac) there is probably a better template-magic way to get the const and non-const overloads to share an implementation
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inline span<char, dynamic_range> ensure_z(char* const& sz, std::ptrdiff_t max)
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{
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auto len = strnlen(sz, max);
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Ensures(sz[len] == 0);
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return{ sz, static_cast<std::ptrdiff_t>(len) };
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}
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inline span<const char, dynamic_range> ensure_z(const char* const& sz, std::ptrdiff_t max)
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{
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auto len = strnlen(sz, max);
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Ensures(sz[len] == 0);
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return{ sz, static_cast<std::ptrdiff_t>(len) };
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}
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inline span<wchar_t, dynamic_range> ensure_z(wchar_t* const& sz, std::ptrdiff_t max)
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{
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auto len = wcsnlen(sz, max);
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Ensures(sz[len] == 0);
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return{ sz, static_cast<std::ptrdiff_t>(len) };
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}
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inline span<const wchar_t, dynamic_range> ensure_z(const wchar_t* const& sz, std::ptrdiff_t max)
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{
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auto len = wcsnlen(sz, max);
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Ensures(sz[len] == 0);
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return{ sz, static_cast<std::ptrdiff_t>(len) };
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}
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template<typename T, size_t N>
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span<T, dynamic_range> ensure_z(T(&sz)[N]) { return ensure_z(&sz[0], static_cast<std::ptrdiff_t>(N)); }
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template<class Cont>
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span<typename std::remove_pointer<typename Cont::pointer>::type, dynamic_range> ensure_z(Cont& cont)
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{
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return ensure_z(cont.data(), static_cast<std::ptrdiff_t>(cont.length()));
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}
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template<typename CharT, std::ptrdiff_t>
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class basic_string_span;
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namespace details
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{
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template <typename T>
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struct is_basic_string_span_oracle : std::false_type
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{};
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template <typename CharT, std::ptrdiff_t Extent>
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struct is_basic_string_span_oracle<basic_string_span<CharT, Extent>> : std::true_type
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{};
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template <typename T>
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struct is_basic_string_span : is_basic_string_span_oracle<std::remove_cv_t<T>>
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{};
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template <typename T>
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struct length_func
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{};
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template <>
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struct length_func<char>
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{
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std::ptrdiff_t operator()(char* const ptr, std::ptrdiff_t length) noexcept
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{
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return narrow_cast<std::ptrdiff_t>(strnlen(ptr, length));
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}
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};
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template <>
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struct length_func<wchar_t>
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{
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std::ptrdiff_t operator()(wchar_t* const ptr, std::ptrdiff_t length) noexcept
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{
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return narrow_cast<std::ptrdiff_t>(wcsnlen(ptr, length));
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}
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};
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template <>
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struct length_func<const char>
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{
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std::ptrdiff_t operator()(const char* const ptr, std::ptrdiff_t length) noexcept
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{
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return narrow_cast<std::ptrdiff_t>(strnlen(ptr, length));
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}
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};
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template <>
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struct length_func<const wchar_t>
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{
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std::ptrdiff_t operator()(const wchar_t* const ptr, std::ptrdiff_t length) noexcept
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{
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return narrow_cast<std::ptrdiff_t>(wcsnlen(ptr, length));
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}
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};
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}
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//
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// string_span and relatives
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//
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// Note that Extent is always single-dimension only
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//
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template <typename CharT, std::ptrdiff_t Extent = dynamic_range>
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class basic_string_span
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{
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using value_type = CharT;
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using const_value_type = std::add_const_t<value_type>;
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using pointer = std::add_pointer_t<value_type>;
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using reference = std::add_lvalue_reference_t<value_type>;
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using const_reference = std::add_lvalue_reference_t<const_value_type>;
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using bounds_type = static_bounds<Extent>;
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using impl_type = span<value_type, Extent>;
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public:
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using size_type = ptrdiff_t;
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using iterator = typename impl_type::iterator;
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using const_iterator = typename impl_type::const_iterator;
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using reverse_iterator = typename impl_type::reverse_iterator;
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using const_reverse_iterator = typename impl_type::const_reverse_iterator;
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// default (empty)
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constexpr basic_string_span() = default;
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// copy
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constexpr basic_string_span(const basic_string_span& other) = default;
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// move
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#ifdef GSL_MSVC_NO_SUPPORT_FOR_MOVE_CTOR_DEFAULT
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constexpr basic_string_span(basic_string_span&& other)
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: span_(std::move(other.span_))
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{
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}
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#else
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constexpr basic_string_span(basic_string_span&& other) = default;
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#endif
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// assign
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constexpr basic_string_span& operator=(const basic_string_span& other) = default;
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// move assign
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#ifdef GSL_MSVC_NO_SUPPORT_FOR_MOVE_CTOR_DEFAULT
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constexpr basic_string_span& operator=(basic_string_span&& other)
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{
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span_ = std::move(other.span_);
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return *this;
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}
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#else
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constexpr basic_string_span& operator=(basic_string_span&& other) = default;
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#endif
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// from nullptr and length
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constexpr basic_string_span(std::nullptr_t ptr, size_type length) noexcept
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: span_(ptr, length)
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{}
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// For pointers and static arrays - if 0-terminated, remove 0 from the view
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// from raw data and length
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constexpr basic_string_span(pointer ptr, size_type length) noexcept
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: span_(remove_z(ptr, length))
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{}
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// from static arrays and string literals
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template<size_t N>
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constexpr basic_string_span(value_type(&arr)[N]) noexcept
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: span_(remove_z(arr))
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{}
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// Those allow 0s within the length, so we do not remove them
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// from string
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constexpr basic_string_span(std::string& s) noexcept
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: span_(&(s.at(0)), narrow_cast<std::ptrdiff_t>(s.length()))
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{}
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#ifdef GSL_MSVC2013_ICE_WHEN_USING_DUMMY_TEMPLATE_PARAMETER
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template<
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typename Cont,
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typename DataType = typename Cont::value_type
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>
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constexpr basic_string_span(
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Cont& cont,
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std::enable_if_t<
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!details::is_span<Cont>::value
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&& !details::is_basic_string_span<Cont>::value
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&& !(!std::is_const<value_type>::value && std::is_const<Cont>::value)
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&& std::is_convertible<DataType*, value_type*>::value
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&& std::is_same<std::decay_t<decltype(std::declval<Cont>().size(), *std::declval<Cont>().data())>, DataType>::value
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>* = nullptr
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)
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: span_(cont.data(), cont.size())
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{}
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// disallow creation from temporary containers and strings
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template<
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typename Cont,
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typename DataType = typename Cont::value_type
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>
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explicit basic_string_span(
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Cont&& cont
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,
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std::enable_if_t<
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!details::is_span<Cont>::value
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&& !details::is_basic_string_span<Cont>::value
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&& std::is_convertible<DataType*, value_type*>::value
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&& std::is_same<std::decay_t<decltype(std::declval<Cont>().size(), *std::declval<Cont>().data())>, DataType>::value
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>* = nullptr
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) = delete;
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// from span
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template<
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typename OtherValueType,
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std::ptrdiff_t... OtherDimensions,
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typename OtherBounds = static_bounds<OtherDimensions...>
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>
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constexpr basic_string_span(
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span<OtherValueType, OtherDimensions...> other,
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typename std::enable_if<
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std::is_convertible<OtherValueType, value_type>::value &&
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std::is_convertible<OtherBounds, bounds_type>::value
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>::type* = nullptr
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) noexcept
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: span_(other)
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{}
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// from string_span
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template<
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typename OtherValueType,
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std::ptrdiff_t OtherExtent,
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typename OtherBounds = static_bounds<OtherExtent>
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>
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constexpr basic_string_span(
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basic_string_span<OtherValueType, OtherExtent> other,
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std::enable_if_t<
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std::is_convertible<OtherValueType*, value_type*>::value
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&& std::is_convertible<OtherBounds, bounds_type>::value
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>* = nullptr
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) noexcept
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: span_(other.data(), other.length())
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{}
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#else // GSL_MSVC2013_ICE_WHEN_USING_DUMMY_TEMPLATE_PARAMETER
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// from containers. Containers must have .size() and .data() function signatures
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template <typename Cont, typename DataType = typename Cont::value_type,
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typename Dummy = std::enable_if_t<!details::is_span<Cont>::value
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&& !details::is_basic_string_span<Cont>::value
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&& !(!std::is_const<value_type>::value && std::is_const<Cont>::value) // no converting const containers to non-const span
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&& std::is_convertible<DataType*, value_type*>::value
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&& std::is_same<std::decay_t<decltype(std::declval<Cont>().size(), *std::declval<Cont>().data())>, DataType>::value>
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>
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constexpr basic_string_span(Cont& cont)
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: span_(cont.data(), cont.size())
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{}
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// disallow creation from temporary containers and strings
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template <typename Cont, typename DataType = typename Cont::value_type,
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typename Dummy = std::enable_if_t<!details::is_span<Cont>::value
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&& !details::is_basic_string_span<Cont>::value
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&& std::is_convertible<DataType*, value_type*>::value
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&& std::is_same<std::decay_t<decltype(std::declval<Cont>().size(), *std::declval<Cont>().data())>, DataType>::value>
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>
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basic_string_span(Cont&& cont) = delete;
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// from span
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template <typename OtherValueType, std::ptrdiff_t OtherExtent,
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typename OtherBounds = static_bounds<OtherExtent>,
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typename Dummy = std::enable_if_t<std::is_convertible<OtherValueType*, value_type*>::value && std::is_convertible<OtherBounds, bounds_type>::value>
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>
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constexpr basic_string_span(span<OtherValueType, OtherExtent> other) noexcept
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: span_(other)
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{}
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// from string_span
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template <typename OtherValueType, std::ptrdiff_t OtherExtent,
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typename OtherBounds = static_bounds<OtherExtent>,
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typename Dummy = std::enable_if_t<std::is_convertible<OtherValueType*, value_type*>::value && std::is_convertible<OtherBounds, bounds_type>::value>
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>
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constexpr basic_string_span(basic_string_span<OtherValueType, OtherExtent> other) noexcept
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: span_(other.data(), other.length())
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{}
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#endif // GSL_MSVC2013_ICE_WHEN_USING_DUMMY_TEMPLATE_PARAMETER
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constexpr bool empty() const noexcept
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{
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return length() == 0;
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}
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// first Count elements
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template<size_type Count>
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constexpr basic_string_span<value_type, Count> first() const noexcept
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{
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return{ span_.template first<Count>() };
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}
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constexpr basic_string_span<value_type, dynamic_range> first(size_type count) const noexcept
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{
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return{ span_.first(count) };
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}
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// last Count elements
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template<size_type Count>
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constexpr basic_string_span<value_type, Count> last() const noexcept
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{
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return{ span_.template last<Count>() };
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}
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constexpr basic_string_span<value_type, dynamic_range> last(size_type count) const noexcept
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{
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return{ span_.last(count) };
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}
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// create a subview of Count elements starting from Offset
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template<size_type Offset, size_type Count>
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constexpr basic_string_span<value_type, Count> subspan() const noexcept
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{
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return{ span_.template subspan<Offset, Count>() };
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}
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constexpr basic_string_span<value_type, dynamic_range> subspan(size_type offset, size_type count = dynamic_range) const noexcept
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{
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return{ span_.subspan(offset, count) };
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}
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constexpr reference operator[](size_type idx) const noexcept
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{
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return span_[idx];
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}
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constexpr pointer data() const noexcept
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{
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return span_.data();
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}
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// length of the span in elements
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constexpr size_type length() const noexcept
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{
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return span_.size();
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}
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// length of the span in elements
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constexpr size_type size() const noexcept
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{
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return span_.size();
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}
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// length of the span in bytes
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constexpr size_type size_bytes() const noexcept
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{
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return span_.size_bytes();
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}
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// length of the span in bytes
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constexpr size_type length_bytes() const noexcept
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{
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return span_.length_bytes();
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}
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constexpr iterator begin() const noexcept
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{
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return span_.begin();
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}
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constexpr iterator end() const noexcept
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{
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return span_.end();
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}
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constexpr const_iterator cbegin() const noexcept
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{
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return span_.cbegin();
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}
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constexpr const_iterator cend() const noexcept
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{
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span_.cend();
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}
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constexpr reverse_iterator rbegin() const noexcept
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{
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return span_.rbegin();
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}
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constexpr reverse_iterator rend() const noexcept
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{
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return span_.rend();
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}
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constexpr const_reverse_iterator crbegin() const noexcept
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{
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return span_.crbegin();
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}
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constexpr const_reverse_iterator crend() const noexcept
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{
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return span_.crend();
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}
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private:
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static impl_type remove_z(pointer const& sz, std::ptrdiff_t max) noexcept
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{
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return{ sz, details::length_func<value_type>()(sz, max)};
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}
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template<size_t N>
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static impl_type remove_z(value_type(&sz)[N]) noexcept
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{
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return remove_z(&sz[0], narrow_cast<std::ptrdiff_t>(N));
|
|
}
|
|
|
|
impl_type span_;
|
|
};
|
|
|
|
template<std::ptrdiff_t Extent = dynamic_range>
|
|
using string_span = basic_string_span<char, Extent>;
|
|
|
|
template<std::ptrdiff_t Extent = dynamic_range>
|
|
using cstring_span = basic_string_span<const char, Extent>;
|
|
|
|
template<std::ptrdiff_t Extent = dynamic_range>
|
|
using wstring_span = basic_string_span<wchar_t, Extent>;
|
|
|
|
template<std::ptrdiff_t Extent = dynamic_range>
|
|
using cwstring_span = basic_string_span<const wchar_t, Extent>;
|
|
|
|
//
|
|
// to_string() allow (explicit) conversions from string_span to string
|
|
//
|
|
#ifndef GSL_MSVC_HAS_TYPE_DEDUCTION_BUG
|
|
|
|
template<typename CharT, ptrdiff_t Extent>
|
|
std::basic_string<typename std::remove_const<CharT>::type> to_string(basic_string_span<CharT, Extent> view)
|
|
{
|
|
return{ view.data(), static_cast<size_t>(view.length()) };
|
|
}
|
|
|
|
#else
|
|
|
|
inline std::string to_string(cstring_span<> view)
|
|
{
|
|
return{ view.data(), view.length() };
|
|
}
|
|
|
|
inline std::string to_string(string_span<> view)
|
|
{
|
|
return{ view.data(), view.length() };
|
|
}
|
|
|
|
inline std::wstring to_string(cwstring_span<> view)
|
|
{
|
|
return{ view.data(), view.length() };
|
|
}
|
|
|
|
inline std::wstring to_string(wstring_span<> view)
|
|
{
|
|
return{ view.data(), view.length() };
|
|
}
|
|
|
|
#endif
|
|
|
|
template<typename CharT, size_t Extent = dynamic_range>
|
|
class basic_zstring_builder
|
|
{
|
|
public:
|
|
using impl_type = span<CharT, Extent>;
|
|
using string_span_type = basic_string_span<CharT, Extent>;
|
|
using value_type = CharT;
|
|
using pointer = CharT*;
|
|
using size_type = typename string_span_type::size_type;
|
|
using iterator = typename string_span_type::iterator;
|
|
|
|
basic_zstring_builder(CharT* data, size_type length) : sv_(data, length) {}
|
|
|
|
template<size_t Size>
|
|
basic_zstring_builder(CharT(&arr)[Size]) : sv_(arr) {}
|
|
|
|
pointer data() const { return sv_.data(); }
|
|
string_span_type view() const { return sv_; }
|
|
|
|
size_type length() const { return sv_.length(); }
|
|
|
|
pointer assume0() const { return data(); }
|
|
string_span_type ensure_z() const { return gsl::ensure_z(sv_); }
|
|
|
|
iterator begin() const { return sv_.begin(); }
|
|
iterator end() const { return sv_.end(); }
|
|
|
|
private:
|
|
impl_type sv_;
|
|
};
|
|
|
|
template <size_t Max = dynamic_range>
|
|
using zstring_builder = basic_zstring_builder<char, Max>;
|
|
|
|
template <size_t Max = dynamic_range>
|
|
using wzstring_builder = basic_zstring_builder<wchar_t, Max>;
|
|
}
|
|
|
|
template <typename CharT, std::ptrdiff_t Extent = gsl::dynamic_range>
|
|
bool operator==(const gsl::basic_string_span<CharT, Extent>& one, const gsl::basic_string_span<CharT, Extent>& other) noexcept
|
|
{
|
|
#ifdef GSL_MSVC2013_EQUAL_ALGORITHM_IS_NOT_CPP14
|
|
if (std::distance(one.begin(), one.end()) != std::distance(other.begin(), other.end()))
|
|
return false;
|
|
return std::equal(one.begin(), one.end(), other.begin());
|
|
#else
|
|
return std::equal(one.begin(), one.end(), other.begin(), other.end());
|
|
#endif
|
|
}
|
|
|
|
template <typename CharT, std::ptrdiff_t Extent = gsl::dynamic_range>
|
|
bool operator<(const gsl::basic_string_span<CharT, Extent>& one, const gsl::basic_string_span<CharT, Extent>& other) noexcept
|
|
{
|
|
return std::lexicographical_compare(one.begin(), one.end(), other.begin(), other.end());
|
|
}
|
|
|
|
template <typename CharT, std::ptrdiff_t Extent = gsl::dynamic_range>
|
|
bool operator<=(const gsl::basic_string_span<CharT, Extent>& one, const gsl::basic_string_span<CharT, Extent>& other) noexcept
|
|
{
|
|
return !(other < one);
|
|
}
|
|
|
|
template <typename CharT, std::ptrdiff_t Extent = gsl::dynamic_range>
|
|
bool operator>(const gsl::basic_string_span<CharT, Extent>& one, const gsl::basic_string_span<CharT, Extent>& other) noexcept
|
|
{
|
|
return other < one;
|
|
}
|
|
|
|
template <typename CharT, std::ptrdiff_t Extent = gsl::dynamic_range>
|
|
bool operator>=(const gsl::basic_string_span<CharT, Extent>& one, const gsl::basic_string_span<CharT, Extent>& other) noexcept
|
|
{
|
|
return !(one < other);
|
|
}
|
|
|
|
// VS 2013 workarounds
|
|
#ifdef _MSC_VER
|
|
|
|
#undef constexpr
|
|
#pragma pop_macro("constexpr")
|
|
|
|
#if _MSC_VER <= 1800
|
|
|
|
#ifndef GSL_THROW_ON_CONTRACT_VIOLATION
|
|
#undef noexcept
|
|
#pragma pop_macro("noexcept")
|
|
#endif // GSL_THROW_ON_CONTRACT_VIOLATION
|
|
|
|
#undef GSL_MSVC2013_EQUAL_ALGORITHM_IS_NOT_CPP14
|
|
#undef GSL_MSVC2013_ICE_WHEN_USING_DUMMY_TEMPLATE_PARAMETER
|
|
#undef GSL_MSVC_HAS_TYPE_DEDUCTION_BUG
|
|
|
|
#endif // _MSC_VER <= 1800
|
|
#endif // _MSC_VER
|
|
|
|
#if defined(GSL_THROW_ON_CONTRACT_VIOLATION)
|
|
|
|
#undef noexcept
|
|
|
|
#ifdef _MSC_VER
|
|
#pragma pop_macro("noexcept")
|
|
#endif
|
|
|
|
#endif // GSL_THROW_ON_CONTRACT_VIOLATION
|
|
|
|
#endif // GSL_STRING_SPAN_H
|