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Make Ludic text correct-by-default over UTF-8, so player names, translated UI, and chat behave for every language instead of counting bytes and splitting characters in half. The byte-oriented Text.* stays for speed; Unicode.* is the layer that understands code points and (approximately) grapheme clusters. - len / byte_len code points vs bytes — the two lengths, kept distinct - is_valid_utf8 strict validation of untrusted input - char_at / chars code-point access by index; chars() -> []int - upper / lower case mapping (ASCII + Latin-1) - truncate first n code points, never a half-character - grapheme_len user-perceived characters (approx UAX#29) Pure integer/byte IR over NUL-terminated buffers; C-free, no data-table blob. Decoding and validation cover the full UTF-8 range (overlong/surrogate/>10FFFF rejected). grapheme_len collapses combining marks, variation selectors, ZWJ sequences (family emoji), and regional-indicator flag pairs. Documented v1 scope: wider-script/locale case rules (Latin-Extended, Greek, Cyrillic, Turkish i, German ß) and NFC normalization are follow-ups. - examples/library/unicode.ludic: asserts the invariants across ASCII, Latin-1 (é round-trips through upper/lower), a decomposed "café" (5 code points, 4 graphemes), a ZWJ family emoji (5 code points, 1 grapheme), and a flag (2 regional indicators, 1 grapheme). Wired into `x test` (now 55 passed). - docs: a new Unicode section + 9 per-symbol pages clarifying byte vs code point vs grapheme; inventory updated; every fence passes check-docs; site builds. - seed regenerated; `x bootstrap-cfree` fixpoint holds. Closes #13 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
646 B
646 B
| id | name | category | kind | tokens | sig | tip | order | ns | member |
|---|---|---|---|---|---|---|---|---|---|
| unicode-chars | Unicode.chars | unicode | namespace-method | Unicode.chars | Unicode.chars(s) -> []int | Every code point of a string, in order. | 5 | Unicode | chars |
Decodes the whole string into a []int of code points, in order — the iteration primitive for laying out glyphs, scanning text, or transforming character by character without byte-fiddling.
Parameters:
s— the UTF-8 string
program Chars {
entry {
let cs = Unicode.chars("hi")
var i = 0
while i < len(cs) { print(cs[i]); i = i + 1 } # 104, 105
}
}