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#pragma once
#include "types.h"
#include <algorithm>
#include <stdexcept>
#include <string>
#include <unordered_map>
namespace unicode::detail {
using namespace std::string_literals;
typedef std::unordered_map<iso_t, char32_t> iso_map_type;
typedef std::unordered_map<char32_t, iso_t> iso_map_type_reverse;
// ISO-8859-1 is lower 8-bit of Unicode, so no exceptions necessary
static inline iso_map_type iso_8859_1_map;
// ISO-8859-15 is lower 8-bit of Unicode, except for:
static inline iso_map_type iso_8859_15_map {
{ '\xA4', U'\u20AC' }, // €
{ '\xA6', U'\u0160' }, // Š
{ '\xA8', U'\u0161' }, // š
{ '\xB4', U'\u017D' }, // Ž
{ '\xB8', U'\u017E' }, // ž
{ '\xBC', U'\u0152' }, // Œ
{ '\xBD', U'\u0153' }, // œ
{ '\xBE', U'\u0178' }, // Ÿ
};
inline iso_map_type_reverse reverse_iso_map(const iso_map_type& map) {
iso_map_type_reverse result;
std::for_each(map.cbegin(), map.cend(),
[&](const iso_map_type::value_type& pair)
{
result.emplace(pair.second, pair.first);
result.emplace(static_cast<char32_t>(static_cast<uint8_t>(pair.first)), 0); // map invalid characters to a known non-mapped value as marker
});
return result;
}
static inline iso_map_type_reverse iso_8859_15_map_reverse { reverse_iso_map(iso_8859_15_map) };
static inline iso_map_type_reverse iso_8859_1_map_reverse { reverse_iso_map(iso_8859_1_map) };
template<unicode::detail::iso_map_type& Map=iso_8859_1_map, typename Container=std::basic_string<iso_t>>
struct iso_iterator {
typedef iso_t value_type;
typedef char32_t internal_type;
typedef char32_t& reference;
typedef char32_t* pointer;
typedef size_t difference_type;
typedef std::input_iterator_tag iterator_category;
typedef typename Container::const_iterator iterator;
typedef Container string_type;
iso_iterator(const iterator& it): m_it(it) {}
// pre-increment
iso_iterator& operator++()
{
++m_it;
return *this;
}
bool operator!=(const iso_iterator& other) const
{
return m_it != other.m_it;
}
// return reference?
internal_type operator*() const
{
value_type value{*m_it};
if constexpr(std::addressof(Map) != std::addressof(iso_8859_1_map)) // mapping of 128 <= x <= 255 if needed
{
auto it{Map.find(value)};
if (it != Map.end())
return it->second;
}
return static_cast<internal_type>(static_cast<uint8_t>(value));
}
iso_iterator& operator+=(size_t distance)
{
std::advance(m_it, distance);
return *this;
}
difference_type operator-(const iso_iterator& other) const
{
return m_it - other.m_it;
}
private:
iterator m_it;
};
template<unicode::detail::iso_map_type_reverse& Map=iso_8859_1_map_reverse, typename Container=std::basic_string<iso_t>>
struct iso_back_insert_iterator {
typedef iso_back_insert_iterator& reference;
typedef iso_back_insert_iterator* pointer;
typedef size_t difference_type;
typedef iso_t value_type;
typedef char32_t internal_type;
typedef std::output_iterator_tag iterator_category;
typedef Container string_type;
iso_back_insert_iterator(string_type& s): s(s) {}
iso_back_insert_iterator& operator=(const iso_back_insert_iterator& other)
{
if (std::addressof(other.s) != std::addressof(s))
throw std::runtime_error("iso_back_insert_iterator assignment operator actually called! Iterator should not be assigned to.");
return *this;
}
// no-op
reference operator++()
{
return *this;
}
// support *x = value, together with operator=()
reference operator*()
{
return *this;
}
reference operator=(const internal_type& value)
{
if constexpr(std::addressof(Map) != std::addressof(iso_8859_1_map_reverse)) // mapping back to 128 <= x <= 255 if needed
{
auto it{Map.find(value)};
if (it != Map.end()) {
if (it->second == 0) // marker for non-mappable character found
throw std::invalid_argument("Bad Unicode value to map to ISO 8859-15: "s + std::to_string(static_cast<uint32_t>(value)));
s.push_back(it->second);
return *this;
}
}
if (value > 255)
throw std::invalid_argument("Bad ISO 8859 value above 255: "s + std::to_string(static_cast<uint32_t>(value)));
s.push_back(static_cast<typename iso_back_insert_iterator::value_type>(value));
return *this;
}
private:
typename iso_back_insert_iterator::string_type& s;
};
} // namespace unicode::detail
namespace unicode {
using namespace detail;
// Encoding for convert() and ISO-8859-*
template<typename InputIt, typename OutputIt>
struct ISO_8859
{
typedef iso_t value_type;
typedef typename InputIt::string_type string_type;
static InputIt begin(const typename InputIt::string_type& s)
{
return InputIt(s.cbegin());
}
static InputIt end(const typename InputIt::string_type& s)
{
return InputIt(s.cend());
}
static OutputIt back_inserter(typename OutputIt::string_type& s)
{
return OutputIt(s);
}
};
// Encoding for convert()
typedef ISO_8859<iso_iterator<>, iso_back_insert_iterator<>> ISO_8859_1;
typedef ISO_8859<iso_iterator<iso_8859_15_map>, iso_back_insert_iterator<iso_8859_15_map_reverse>> ISO_8859_15;
} // namespace unicode
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