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277 lines (256 loc) · 8.72 KB
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#include "unicode.h"
#include "unicode-data.h"
#include <cassert>
#include <cstddef>
#include <cstdint>
#include <map>
#include <stdexcept>
#include <string>
#include <unordered_map>
#include <utility>
#include <vector>
static std::string unicode_cpts_to_utf8(const std::vector<uint32_t> & cps) {
std::string result;
for (size_t i = 0; i < cps.size(); ++i) {
result.append(unicode_cpt_to_utf8(cps[i]));
}
return result;
}
static uint32_t unicode_cpt_from_utf8(const std::string & utf8, size_t & offset) {
assert(offset < utf8.size());
if (!(utf8[offset + 0] & 0x80)) {
auto result = utf8[offset + 0];
offset += 1;
return result;
}
if (!(utf8[offset + 0] & 0x40)) {
throw std::invalid_argument("invalid character");
}
if (!(utf8[offset + 0] & 0x20)) {
if (offset + 1 >= utf8.size() || ! ((utf8[offset + 1] & 0xc0) == 0x80)) {
throw std::invalid_argument("invalid character");
}
auto result = ((utf8[offset + 0] & 0x1f) << 6) | (utf8[offset + 1] & 0x3f);
offset += 2;
return result;
}
if (!(utf8[offset + 0] & 0x10)) {
if (offset + 2 >= utf8.size() || ! ((utf8[offset + 1] & 0xc0) == 0x80) || ! ((utf8[offset + 2] & 0xc0) == 0x80)) {
throw std::invalid_argument("invalid character");
}
auto result = ((utf8[offset + 0] & 0x0f) << 12) | ((utf8[offset + 1] & 0x3f) << 6) | (utf8[offset + 2] & 0x3f);
offset += 3;
return result;
}
if (!(utf8[offset + 0] & 0x08)) {
if (offset + 3 >= utf8.size() || ! ((utf8[offset + 1] & 0xc0) == 0x80) || ! ((utf8[offset + 2] & 0xc0) == 0x80) || !((utf8[offset + 3] & 0xc0) == 0x80)) {
throw std::invalid_argument("invalid character");
}
auto result = ((utf8[offset + 0] & 0x07) << 18) | ((utf8[offset + 1] & 0x3f) << 12) | ((utf8[offset + 2] & 0x3f) << 6) | (utf8[offset + 3] & 0x3f);
offset += 4;
return result;
}
throw std::invalid_argument("invalid string");
}
static std::vector<uint16_t> unicode_cpt_to_utf16(uint32_t cp) {
std::vector<uint16_t> result;
if (/* 0x0000 <= cp && */ cp <= 0xffff) {
result.emplace_back(cp);
}
else if (0x10000 <= cp && cp <= 0x10ffff) {
result.emplace_back(0xd800 | ((cp - 0x10000) >> 10));
result.emplace_back(0xdc00 | ((cp - 0x10000) & 0x03ff));
}
else {
throw std::invalid_argument("invalid cpt");
}
return result;
}
//static std::vector<uint16_t> unicode_cpts_to_utf16(const std::vector<uint32_t> & cps) {
// std::vector<uint16_t> result;
// for (size_t i = 0; i < cps.size(); ++i) {
// auto temp = unicode_cpt_to_utf16(cps[i]);
// result.insert(result.end(), temp.begin(), temp.end());
// }
// return result;
//}
static uint32_t cpt_from_utf16(const std::vector<uint16_t> & utf16, size_t & offset) {
assert(offset < utf16.size());
if (((utf16[0] >> 10) << 10) != 0xd800) {
auto result = utf16[offset + 0];
offset += 1;
return result;
}
if (offset + 1 >= utf16.size() || !((utf16[1] & 0xdc00) == 0xdc00)) {
throw std::invalid_argument("invalid character");
}
auto result = 0x10000 + (((utf16[0] & 0x03ff) << 10) | (utf16[1] & 0x03ff));
offset += 2;
return result;
}
//static std::vector<uint32_t> unicode_cpts_from_utf16(const std::vector<uint16_t> & utf16) {
// std::vector<uint32_t> result;
// size_t offset = 0;
// while (offset < utf16.size()) {
// result.push_back(cpt_from_utf16(utf16, offset));
// }
// return result;
//}
static std::unordered_map<uint32_t, int> unicode_cpt_type_map() {
std::unordered_map<uint32_t, int> cpt_types;
for (auto p : unicode_ranges_digit) {
for (auto i = p.first; i <= p.second; ++ i) {
cpt_types[i] = CODEPOINT_TYPE_DIGIT;
}
}
for (auto p : unicode_ranges_letter) {
for (auto i = p.first; i <= p.second; ++ i) {
cpt_types[i] = CODEPOINT_TYPE_LETTER;
}
}
for (auto p : unicode_ranges_whitespace) {
for (auto i = p.first; i <= p.second; ++ i) {
cpt_types[i] = CODEPOINT_TYPE_WHITESPACE;
}
}
for (auto p : unicode_ranges_accent_mark) {
for (auto i = p.first; i <= p.second; ++ i) {
cpt_types[i] = CODEPOINT_TYPE_ACCENT_MARK;
}
}
for (auto p : unicode_ranges_punctuation) {
for (auto i = p.first; i <= p.second; ++ i) {
cpt_types[i] = CODEPOINT_TYPE_PUNCTUATION;
}
}
for (auto p : unicode_ranges_symbol) {
for (auto i = p.first; i <= p.second; ++i) {
cpt_types[i] = CODEPOINT_TYPE_SYMBOL;
}
}
for (auto p : unicode_ranges_control) {
for (auto i = p.first; i <= p.second; ++ i) {
cpt_types[i] = CODEPOINT_TYPE_CONTROL;
}
}
return cpt_types;
}
static std::unordered_map<uint8_t, std::string> unicode_byte_to_utf8_map() {
std::unordered_map<uint8_t, std::string> map;
for (int ch = u'!'; ch <= u'~'; ++ch) {
assert(0 <= ch && ch < 256);
map[ch] = unicode_cpt_to_utf8(ch);
}
for (int ch = u'¡'; ch <= u'¬'; ++ch) {
assert(0 <= ch && ch < 256);
map[ch] = unicode_cpt_to_utf8(ch);
}
for (int ch = u'®'; ch <= u'ÿ'; ++ch) {
assert(0 <= ch && ch < 256);
map[ch] = unicode_cpt_to_utf8(ch);
}
auto n = 0;
for (int ch = 0; ch < 256; ++ch) {
if (map.find(ch) == map.end()) {
map[ch] = unicode_cpt_to_utf8(256 + n);
++n;
}
}
return map;
}
static std::unordered_map<std::string, uint8_t> unicode_utf8_to_byte_map() {
std::unordered_map<std::string, uint8_t> map;
for (int ch = u'!'; ch <= u'~'; ++ch) {
assert(0 <= ch && ch < 256);
map[unicode_cpt_to_utf8(ch)] = ch;
}
for (int ch = u'¡'; ch <= u'¬'; ++ch) {
assert(0 <= ch && ch < 256);
map[unicode_cpt_to_utf8(ch)] = ch;
}
for (int ch = u'®'; ch <= u'ÿ'; ++ch) {
assert(0 <= ch && ch < 256);
map[unicode_cpt_to_utf8(ch)] = ch;
}
auto n = 0;
for (int ch = 0; ch < 256; ++ch) {
if (map.find(unicode_cpt_to_utf8(ch)) == map.end()) {
map[unicode_cpt_to_utf8(256 + n)] = ch;
++n;
}
}
return map;
}
//
// interface
//
std::string unicode_cpt_to_utf8(uint32_t cp) {
std::string result;
if (/* 0x00 <= cp && */ cp <= 0x7f) {
result.push_back(cp);
}
else if (0x80 <= cp && cp <= 0x7ff) {
result.push_back(0xc0 | ((cp >> 6) & 0x1f));
result.push_back(0x80 | (cp & 0x3f));
}
else if (0x800 <= cp && cp <= 0xffff) {
result.push_back(0xe0 | ((cp >> 12) & 0x0f));
result.push_back(0x80 | ((cp >> 6) & 0x3f));
result.push_back(0x80 | (cp & 0x3f));
}
else if (0x10000 <= cp && cp <= 0x10ffff) {
result.push_back(0xf0 | ((cp >> 18) & 0x07));
result.push_back(0x80 | ((cp >> 12) & 0x3f));
result.push_back(0x80 | ((cp >> 6) & 0x3f));
result.push_back(0x80 | (cp & 0x3f));
}
else {
throw std::invalid_argument("invalid codepoint");
}
return result;
}
std::vector<uint32_t> unicode_cpts_normalize_nfd(const std::vector<uint32_t> & cpts) {
std::vector<uint32_t> result;
result.reserve(cpts.size());
for (size_t i = 0; i < cpts.size(); ++i) {
auto it = unicode_map_nfd.find(cpts[i]);
if (it == unicode_map_nfd.end()) {
result.push_back(cpts[i]);
} else {
result.push_back(it->second);
}
}
return result;
}
std::vector<uint32_t> unicode_cpts_from_utf8(const std::string & utf8) {
std::vector<uint32_t> result;
size_t offset = 0;
while (offset < utf8.size()) {
result.push_back(unicode_cpt_from_utf8(utf8, offset));
}
return result;
}
int unicode_cpt_type(uint32_t cp) {
static std::unordered_map<uint32_t, int> cpt_types = unicode_cpt_type_map();
const auto it = cpt_types.find(cp);
return it == cpt_types.end() ? CODEPOINT_TYPE_UNIDENTIFIED : it->second;
}
int unicode_cpt_type(const std::string & utf8) {
if (utf8.length() == 0) {
return CODEPOINT_TYPE_UNIDENTIFIED;
}
size_t offset = 0;
return unicode_cpt_type(unicode_cpt_from_utf8(utf8, offset));
}
std::string unicode_byte_to_utf8(uint8_t byte) {
static std::unordered_map<uint8_t, std::string> map = unicode_byte_to_utf8_map();
return map.at(byte);
}
uint8_t unicode_utf8_to_byte(const std::string & utf8) {
static std::unordered_map<std::string, uint8_t> map = unicode_utf8_to_byte_map();
return map.at(utf8);
}
char32_t unicode_tolower(char32_t cp) {
auto it = unicode_map_lowercase.find(cp);
return it == unicode_map_lowercase.end() ? cp : it->second;
}
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