mpw-shell/macroman.cpp
2016-08-09 14:40:00 -04:00

164 lines
2.9 KiB
C++

#include <string>
#include <algorithm>
#include <stdint.h>
#include <array>
struct mu_pair {
uint16_t unicode;
uint8_t macroman;
constexpr bool operator<(const mu_pair &rhs) const noexcept {
return unicode < rhs.unicode;
}
constexpr bool operator==(const mu_pair &rhs) const noexcept {
return unicode == rhs.unicode;
}
constexpr bool operator<(uint16_t c) const noexcept {
return unicode < c;
}
constexpr bool operator==(uint16_t c) const noexcept {
return unicode == c;
}
};
uint8_t unicode_to_macroman(uint16_t c){
static std::array< mu_pair, 0x80> table = {{
#undef _
#define _(macroman, unicode, comment) mu_pair{ unicode, macroman } ,
#include "macroman.x"
#undef _
}};
static bool init = false;
if (c < 0x80) return c;
if (!init) {
init = true;
std::sort(table.begin(), table.end());
init = true;
}
auto iter = std::lower_bound(table.begin(), table.end(), c);
if (iter != table.end() && iter->unicode == c) return iter->macroman;
return 0;
}
uint16_t macroman_to_unicode(uint8_t c) {
static std::array<uint16_t, 0x80> table = {{
#undef _
#define _(macroman,unicode,comment) unicode ,
#include "macroman.x"
#undef _
}};
if (c < 0x80) return c;
return table[c - 0x80];
}
std::string utf8_to_macroman(const std::string &s) {
if (std::find_if(s.begin(), s.end(), [](unsigned char c){ return c & 0x80; }) == s.end())
return s;
std::string rv;
rv.reserve(s.size());
unsigned cs = 0;
uint16_t tmp = 0;
for (unsigned char c : s) {
switch(cs) {
case 0:
if (c <= 0x7f) {
rv.push_back(c);
continue;
}
if ((c & 0b11100000) == 0b11000000) {
(tmp = c & 0b00011111);
cs = 1;
continue;
}
if ((c & 0b11110000) == 0b11100000) {
(tmp = c & 0b00001111);
cs = 2;
continue;
}
if ((c & 0b11111000) == 0b11110000) {
(tmp = c & 0b00000111);
cs = 3;
continue;
}
// not utf8...
break;
case 1:
case 2:
case 3:
if ((c & 0b11000000) != 0b10000000) {
//not utf8...
}
tmp = (tmp << 6) + (c & 0b00111111);
if (--cs == 0) {
c = unicode_to_macroman(tmp);
if (c) rv.push_back(c);
}
break;
}
}
return rv;
}
std::string macroman_to_utf8(const std::string &s) {
if (std::find_if(s.begin(), s.end(), [](unsigned char c){ return c & 0x80; }) == s.end())
return s;
std::string rv;
rv.reserve(s.size());
for (uint8_t c : s) {
if (c <= 0x7f) { rv.push_back(c); continue; }
uint16_t tmp = macroman_to_unicode(c);
if (tmp <= 0x7f) {
rv.push_back(tmp);
} else if (tmp <= 0x07ff) {
uint8_t a,b;
b = tmp & 0b00111111; tmp >>= 6;
a = tmp;
rv.push_back(0b11000000 | a);
rv.push_back(0b10000000 | b);
} else { // tmp <= 0xffff
uint8_t a,b,c;
c = tmp & 0b00111111; tmp >>= 6;
b = tmp & 0b00111111; tmp >>= 6;
a = tmp;
rv.push_back(0b11100000 | a);
rv.push_back(0b10000000 | b);
rv.push_back(0b10000000 | c);
}
}
return rv;
}