#include "utils/string_view.hpp"

#include "utils/error.hpp"

#include "utils/microfmt.hpp"

#include <algorithm>

#include <cstring>

CPPTRACE_BEGIN_NAMESPACE

namespace detail {

constexpr std::size_t string_view::npos;

char string_view::operator[](size_t i) const {

ASSERT(i < size());

return ptr[i];

}

char string_view::at(size_t i) const {

if(i >= size()) {

throw std::runtime_error(microfmt::format("Out of bounds access {} >= {}", i, size()));

}

return ptr[i];

}

bool string_view::starts_with(string_view str) const {

return substr(0, str.size()) == str;

}

bool string_view::ends_with(string_view str) const {

if(size() < str.size()) {

return false;

}

return substr(size() - str.size(), str.size()) == str;

}

std::size_t string_view::find_last_of(string_view chars) const {

if(empty() || chars.empty()) {

return npos;

}

std::size_t pos = size();

while(pos-- > 0) {

if(std::find(chars.begin(), chars.end(), ptr[pos]) != chars.end()) {

return pos;

}

}

return npos;

}

bool operator==(string_view a, string_view b) {

return a.size() == b.size() && std::memcmp(a.data(), b.data(), a.size()) == 0;

}

constexpr std::size_t cstring_view::npos;

cstring_view cstring_view::substr(std::size_t pos) const {

ASSERT(pos <= count);

return {ptr + pos, count - pos};

}

void cstring_view::check_null() const {

ASSERT(ptr[count] == 0);

}

}

CPPTRACE_END_NAMESPACE