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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>
725 B
725 B
| id | name | category | kind | tokens | sig | tip | order | ns | member |
|---|---|---|---|---|---|---|---|---|---|
| unicode-truncate | Unicode.truncate | unicode | namespace-method | Unicode.truncate | Unicode.truncate(s, n) -> string | First n code points of a string. | 8 | Unicode | truncate |
Returns the first n code points as a new string, never splitting a multibyte character — the safe way to cap a display name or a chat line to a length. If the string has fewer than n code points it is returned whole; n <= 0 yields the empty string.
Parameters:
s— the UTF-8 stringn— the maximum number of code points to keep
program Truncate {
entry {
if Unicode.truncate("hello", 3) == "hel" { print(1) }
}
}