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new: unicode.visualStrlen

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minjaesong
2025-10-04 22:39:17 +09:00
parent 71102f1d70
commit 5c3a3a112c
2 changed files with 24 additions and 27 deletions
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21
assets/disk0/tvdos/TVDOS.SYS
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@@ -1390,6 +1390,27 @@ unicode.println = (str) => {
unicode.print(str+'\n\n')
}
unicode.strlen = (str) => {
// Convert string to an array of codepoints using spread operator
// This correctly handles surrogate pairs and counts each codepoint as one
return unicode.utf8toCodepoints(str).length
}
unicode.visualStrlen = (str) => {
function isTripleWidth(c) {
return (0xAC00 <= c && c <= 0xD7FF) && [1,4,8,10,13].includes(((c - 0xAC00) / 588)|0)
}
function isDoubleWidth(c) {
return (0x3000 <= c && c <= 0x303f) || (0x3100 <= c && c <= 0x312f) || (0x3200 <= c && c <= 0x33ff) ||
(0xAC00 <= c && c <= 0xD7FF) || (0xFE30 <= c && c <= 0xFE4F) || (0xFF00 <= c && c <= 0xff60)
}
// Convert string to an array of codepoints using spread operator
// This correctly handles surrogate pairs and counts each codepoint as one
return unicode.utf8toCodepoints(str).reduce((acc, c) => acc + (isTripleWidth(c) ? 3 : isDoubleWidth(c) ? 2 : 1), 0)
}
Object.freeze(unicode);
///////////////////////////////////////////////////////////////////////////////