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string_view.hpp
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179 lines (152 loc) · 5.48 KB
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#ifndef STRING_VIEW_HPP
#define STRING_VIEW_HPP
#include <cstddef>
#include <cstring>
#include <iterator>
#include <string>
#include <cpptrace/utils.hpp>
CPPTRACE_BEGIN_NAMESPACE
namespace detail {
// Simple string view implementations
// I haven't implemented all members because I don't need most of them currently, more may be added as needed
// members exported for tests
class string_view {
const char* ptr;
std::size_t count;
public:
using traits_type = std::char_traits<char>;
using value_type = char;
using size_type = std::size_t;
using difference_type = std::ptrdiff_t;
using pointer = char*;
using const_pointer = const char*;
using reference = char&;
using const_reference = const char&;
using iterator = char*;
using const_iterator = const char*;
using reverse_iterator = std::reverse_iterator<iterator>;
using const_reverse_iterator = std::reverse_iterator<reverse_iterator>;
CPPTRACE_EXPORT static constexpr std::size_t npos = std::string::npos;
string_view() : ptr(nullptr), count(0) {}
string_view(const char* str) : ptr(str), count(std::strlen(str)) {}
string_view(const std::string& str) : ptr(str.c_str()), count(str.size()) {}
string_view(const char* ptr, std::size_t count) : ptr(ptr), count(count) {}
string_view(const char* begin, const char* end) : ptr(begin), count(end - begin) {}
explicit operator std::string() {
return std::string(ptr, ptr + count);
}
const char* data() const noexcept {
return ptr;
}
std::size_t size() const noexcept {
return count;
}
bool empty() const noexcept {
return count == 0;
}
CPPTRACE_EXPORT char operator[](size_t i) const;
CPPTRACE_EXPORT char at(size_t i) const;
char front() {
return operator[](0);
}
char back() {
return operator[](size() - 1);
}
string_view substr(size_t pos = 0, size_t n = npos) const {
return {ptr + pos, (std::min)(size() - pos, n)};
}
void advance(size_t n) {
*this = substr(n);
}
CPPTRACE_EXPORT bool starts_with(string_view chars) const;
CPPTRACE_EXPORT bool ends_with(string_view chars) const;
CPPTRACE_EXPORT std::size_t find_last_of(string_view chars) const;
const_iterator begin() const noexcept {
return ptr;
}
const_iterator end() const noexcept {
return ptr + count;
}
};
CPPTRACE_EXPORT bool operator==(string_view, string_view);
inline bool operator!=(string_view a, string_view b) {
return !(a == b);
}
inline void operator+=(std::string& str, string_view sv) {
str.append(sv.data(), sv.size());
}
class cstring_view {
const char* ptr;
std::size_t count;
public:
using traits_type = std::char_traits<char>;
using value_type = char;
using size_type = std::size_t;
using difference_type = std::ptrdiff_t;
using pointer = char*;
using const_pointer = const char*;
using reference = char&;
using const_reference = const char&;
using iterator = char*;
using const_iterator = const char*;
using reverse_iterator = std::reverse_iterator<iterator>;
using const_reverse_iterator = std::reverse_iterator<reverse_iterator>;
CPPTRACE_EXPORT static constexpr std::size_t npos = string_view::npos;
cstring_view() : ptr(nullptr), count(0) {}
cstring_view(const char* str) : ptr(str), count(std::strlen(str)) {}
cstring_view(const std::string& str) : ptr(str.c_str()), count(str.size()) {}
cstring_view(const char* ptr, std::size_t count) : ptr(ptr), count(count) {
check_null();
}
explicit operator std::string() {
return std::string(ptr, ptr + count);
}
operator string_view() const noexcept {
return string_view(ptr, count);
}
const char* data() const noexcept {
return ptr;
}
const char* c_str() const noexcept {
return ptr;
}
std::size_t size() const noexcept {
return count;
}
bool empty() const noexcept {
return count == 0;
}
char operator[](size_t i) const {
return operator string_view().operator[](i);
}
char at(size_t i) const {
return operator string_view().at(i);
}
char front() {
return operator string_view().front();
}
char back() {
return operator string_view().back();
}
bool starts_with(string_view chars) const {
return operator string_view().starts_with(chars);
}
bool ends_with(string_view chars) const {
return operator string_view().ends_with(chars);
}
std::size_t find_last_of(string_view chars) const {
return operator string_view().find_last_of(chars);
}
CPPTRACE_EXPORT cstring_view substr(std::size_t pos) const;
const_iterator begin() const noexcept {
return ptr;
}
const_iterator end() const noexcept {
return ptr + count;
}
private:
CPPTRACE_EXPORT void check_null() const;
};
}
CPPTRACE_END_NAMESPACE
#endif