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use strings;
//https://unicodeplus.com/
export fn runewidth(r: rune) uint = {
let ru = r: u32;
// emoticons: https://en.wikipedia.org/wiki/Emoticons_(Unicode_block)
if (ru >= '\U0001F600' && ru <= '\U0001F64F') {
return 2;
};
// hiragana: https://en.wikipedia.org/wiki/Hiragana_%28Unicode_block%29
if (ru >= '\U00003040' && ru <= '\U0000309F') {
return 2;
};
// katakana: https://en.wikipedia.org/wiki/Katakana_(Unicode_block)
if (ru >= '\U000030A0' && ru <= '\U000030FF') {
return 2;
};
// CJK: https://en.wikipedia.org/wiki/CJK_Unified_Ideographs_(Unicode_block)
if (ru >= '\U00004E00' && ru <= '\U00009FFF') {
return 2;
};
// CJK Symbols and Punctuation: https://en.wikipedia.org/wiki/CJK_Symbols_and_Punctuation
if (ru >= '\U00003000' && ru <= '\U0000303F') {
return 2;
};
// Hangul Syllables: https://en.wikipedia.org/wiki/Hangul_Syllables
if (ru >= '\U0000AC00' && ru <= '\U0000D7AF') {
return 2;
};
// Miscellaneous Symbols: https://en.wikipedia.org/wiki/Miscellaneous_Symbols_and_Pictographs
if (ru >= '\U00002600' && ru <= '\U000026FF') {
return 2;
};
// Miscellaneous Symbols and Pictographs: https://en.wikipedia.org/wiki/Miscellaneous_Symbols_and_Pictographs
if (ru >= '\U0001F300' && ru <= '\U0001F5FF') {
return 2;
};
// Dingbats: https://en.wikipedia.org/wiki/Dingbats_(Unicode_block)
if (ru >= '\U00002700' && ru <= '\U000027BF') {
return 2;
};
// Transport and Map symbols: https://en.wikipedia.org/wiki/Transport_and_Map_Symbols
if (ru >= '\U0001F680' && ru <= '\U0001F6FF') {
return 2;
};
// Supplemental Symbols and Pictographs: https://en.wikipedia.org/wiki/Supplemental_Symbols_and_Pictographs
if (ru >= '\U0001F900' && ru <= '\U0001F9FF') {
return 2;
};
// Miscellaneous Symbols and Arrows: https://en.wikipedia.org/wiki/Miscellaneous_Symbols_and_Arrows
if (ru >= '\U00002B00' && ru <= '\U00002BFF') {
return 2;
};
// Symbols and Pictographs Extended-A: https://en.wikipedia.org/wiki/Symbols_and_Pictographs_Extended-A
if (ru >= '\U0001FA70' && ru <= '\U0001FAFF') {
return 2;
};
return 1;
};
export fn strwidth(s: str) uint = {
// TODO: handle tabs
const runes = strings::torunes(s);
defer free(runes);
let sum = 0u;
for (let r .. runes) {
sum += runewidth(r);
};
return sum;
};
export fn subwidth(s: str, end: (size | strings::end)) str = {
const runes = strings::torunes(s);
defer free(runes);
let sum = 0u;
for (let i = 0z; i < len(runes); i += 1) {
const r = runes[i];
sum += runewidth(r);
if (sum > end: uint) {
return strings::sub(s, 0, i);
};
};
return s;
};
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