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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#ifndef cm_string_view_hxx
#define cm_string_view_hxx
#include "cmConfigure.h" // IWYU pragma: keep
#if __cplusplus >= 201703L || defined(_MSVC_LANG) && _MSVC_LANG >= 201703L
# define CMake_HAVE_CXX_STRING_VIEW
#endif
#ifdef CMake_HAVE_CXX_STRING_VIEW
# include <string_view>
namespace cm {
using std::string_view;
}
#else
# include <cstddef>
# include <functional>
# include <iosfwd>
# include <iterator>
# include <string>
namespace cm {
class string_view
{
public:
using traits_type = std::string::traits_type;
using value_type = char;
using pointer = char*;
using const_pointer = const char*;
using reference = char&;
using const_reference = char const&;
using const_iterator = const char*;
using iterator = const_iterator;
using const_reverse_iterator = std::reverse_iterator<const_iterator>;
using reverse_iterator = const_reverse_iterator;
using size_type = std::string::size_type;
using difference_type = std::string::difference_type;
static size_type const npos = static_cast<size_type>(-1);
string_view() noexcept = default;
string_view(string_view const&) noexcept = default;
string_view(const char* s, size_t count) noexcept
: data_(s)
, size_(count)
{
}
string_view(const char* s) noexcept
: data_(s)
, size_(traits_type::length(s))
{
}
// C++17 does not define this constructor. Instead it defines
// a conversion operator on std::string to create a string_view.
// Since this implementation is used in C++11, std::string does
// not have that conversion.
string_view(std::string const& s) noexcept
: data_(s.data())
, size_(s.size())
{
}
// C++17 does not define this conversion. Instead it defines
// a constructor on std::string that can take a string_view.
// Since this implementation is used in C++11, std::string does
// not have that constructor.
explicit operator std::string() const { return std::string(data_, size_); }
string_view& operator=(string_view const&) = default;
const_iterator begin() const noexcept { return data_; }
const_iterator end() const noexcept { return data_ + size_; }
const_iterator cbegin() const noexcept { return begin(); }
const_iterator cend() const noexcept { return end(); }
const_reverse_iterator rbegin() const noexcept
{
return const_reverse_iterator(end());
}
const_reverse_iterator rend() const noexcept
{
return const_reverse_iterator(begin());
}
const_reverse_iterator crbegin() const noexcept { return rbegin(); }
const_reverse_iterator crend() const noexcept { return rend(); }
const_reference operator[](size_type pos) const noexcept
{
return data_[pos];
}
const_reference at(size_type pos) const;
const_reference front() const noexcept { return data_[0]; }
const_reference back() const noexcept { return data_[size_ - 1]; }
const_pointer data() const noexcept { return data_; }
size_type size() const noexcept { return size_; }
size_type length() const noexcept { return size_; }
size_type max_size() const noexcept { return npos - 1; }
bool empty() const noexcept { return size_ == 0; }
void remove_prefix(size_type n) noexcept
{
data_ += n;
size_ -= n;
}
void remove_suffix(size_type n) noexcept { size_ -= n; }
void swap(string_view& v) noexcept
{
string_view tmp = v;
v = *this;
*this = tmp;
}
size_type copy(char* dest, size_type count, size_type pos = 0) const;
string_view substr(size_type pos = 0, size_type count = npos) const;
int compare(string_view v) const noexcept;
int compare(size_type pos1, size_type count1, string_view v) const;
int compare(size_type pos1, size_type count1, string_view v, size_type pos2,
size_type count2) const;
int compare(const char* s) const;
int compare(size_type pos1, size_type count1, const char* s) const;
int compare(size_type pos1, size_type count1, const char* s,
size_type count2) const;
size_type find(string_view v, size_type pos = 0) const noexcept;
size_type find(char c, size_type pos = 0) const noexcept;
size_type find(const char* s, size_type pos, size_type count) const;
size_type find(const char* s, size_type pos = 0) const;
size_type rfind(string_view v, size_type pos = npos) const noexcept;
size_type rfind(char c, size_type pos = npos) const noexcept;
size_type rfind(const char* s, size_type pos, size_type count) const;
size_type rfind(const char* s, size_type pos = npos) const;
size_type find_first_of(string_view v, size_type pos = 0) const noexcept;
size_type find_first_of(char c, size_type pos = 0) const noexcept;
size_type find_first_of(const char* s, size_type pos, size_type count) const;
size_type find_first_of(const char* s, size_type pos = 0) const;
size_type find_last_of(string_view v, size_type pos = npos) const noexcept;
size_type find_last_of(char c, size_type pos = npos) const noexcept;
size_type find_last_of(const char* s, size_type pos, size_type count) const;
size_type find_last_of(const char* s, size_type pos = npos) const;
size_type find_first_not_of(string_view v, size_type pos = 0) const noexcept;
size_type find_first_not_of(char c, size_type pos = 0) const noexcept;
size_type find_first_not_of(const char* s, size_type pos,
size_type count) const;
size_type find_first_not_of(const char* s, size_type pos = 0) const;
size_type find_last_not_of(string_view v, size_type pos = npos) const
noexcept;
size_type find_last_not_of(char c, size_type pos = npos) const noexcept;
size_type find_last_not_of(const char* s, size_type pos,
size_type count) const;
size_type find_last_not_of(const char* s, size_type pos = npos) const;
private:
const char* data_ = nullptr;
size_type size_ = 0;
};
std::ostream& operator<<(std::ostream& o, string_view v);
std::string& operator+=(std::string& s, string_view v);
inline bool operator==(string_view l, string_view r) noexcept
{
return l.compare(r) == 0;
}
inline bool operator!=(string_view l, string_view r) noexcept
{
return l.compare(r) != 0;
}
inline bool operator<(string_view l, string_view r) noexcept
{
return l.compare(r) < 0;
}
inline bool operator<=(string_view l, string_view r) noexcept
{
return l.compare(r) <= 0;
}
inline bool operator>(string_view l, string_view r) noexcept
{
return l.compare(r) > 0;
}
inline bool operator>=(string_view l, string_view r) noexcept
{
return l.compare(r) >= 0;
}
}
namespace std {
template <>
struct hash<cm::string_view>
{
typedef cm::string_view argument_type;
typedef size_t result_type;
result_type operator()(argument_type const& s) const noexcept;
};
}
#endif
#endif
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