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add text-processing primitives to el runtime

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24 new functions covering counting (str_count, str_count_chars,
str_count_bytes, str_count_lines, str_count_words, str_count_letters,
str_count_digits), finding (str_index_of_all, str_last_index_of,
str_find_chars), transforming (str_repeat, str_reverse,
str_strip_prefix/suffix/chars, str_lstrip, str_rstrip), character
classification (is_letter, is_digit, is_alphanumeric, is_whitespace,
is_punctuation, is_uppercase, is_lowercase), and splitting/joining
(str_split_lines, str_split_chars, str_split_n, str_join).

Phase 1 is byte-level + ASCII character classes. Unicode-grapheme
awareness, normalization, and regex are Phase 2 (filed separately).

Lexer-internal helpers is_digit, is_alpha, is_whitespace renamed to
lex_is_digit, lex_is_alpha, lex_is_whitespace to free the public names
for the runtime exports. The El compiler's lexer.el and the bundled
elc-combined.el both updated.

Codegen registrations: builtin_arity entries for all 24 functions,
is_int_call entries for the Int-returning ones (str_count*,
str_last_index_of, str_find_chars) so the + operator dispatches as
arithmetic when applicable.

Tests: tests/text/ corpus with 8 acceptance cases covering the surface
(count-substring, count-overlap-skip, count-lines-words-letters,
index-of-all, transform-suite, char-classes, split-lines, join). All
pass against a fold-fn-main-aware elc bootstrap (see ELC env var
override in run.sh).

Self-host fixed point: elc-combined.el's emit-main pass does not
currently fold the fn main body into C's main, a pre-existing
condition that surfaces as a 39-line gen2/gen3 diff with empty main
in gen3. The committed dist/platform/elc binary has the fold logic
so all tests pass against it. Filing the elc-combined fold-fn-main
fix separately. This commit does not introduce new self-host drift.
This commit is contained in:
Will Anderson
2026-05-02 13:37:30 -05:00
parent ed564b6dda
commit 3a83b6eb80
15 changed files with 727 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files
el-compiler/runtime/el_runtime.h
+43
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@@ -445,6 +445,49 @@ el_val_t str_format(el_val_t fmt, el_val_t data);
el_val_t str_lower(el_val_t s);
el_val_t str_upper(el_val_t s);
/* ── Text-processing primitives (Phase 1: byte/codepoint, ASCII char classes)
* Phase 2 (filed): Unicode-grapheme awareness, NFC/NFD normalization, regex.
* is_* predicates: empty input returns false; multi-char requires ALL bytes
* to match. ASCII ranges only in Phase 1. */
/* Counting */
el_val_t str_count(el_val_t s, el_val_t sub); /* non-overlapping */
el_val_t str_count_chars(el_val_t s); /* codepoint count */
el_val_t str_count_bytes(el_val_t s); /* alias of str_len */
el_val_t str_count_lines(el_val_t s);
el_val_t str_count_words(el_val_t s);
el_val_t str_count_letters(el_val_t s); /* ASCII [A-Za-z] */
el_val_t str_count_digits(el_val_t s); /* ASCII [0-9] */
/* Find / position */
el_val_t str_index_of_all(el_val_t s, el_val_t sub); /* [Int] of byte offsets */
el_val_t str_last_index_of(el_val_t s, el_val_t sub);
el_val_t str_find_chars(el_val_t s, el_val_t any_of); /* first idx of any ch */
/* Transform */
el_val_t str_repeat(el_val_t s, el_val_t n);
el_val_t str_reverse(el_val_t s); /* by codepoint */
el_val_t str_strip_prefix(el_val_t s, el_val_t prefix);
el_val_t str_strip_suffix(el_val_t s, el_val_t suffix);
el_val_t str_strip_chars(el_val_t s, el_val_t chars);
el_val_t str_lstrip(el_val_t s);
el_val_t str_rstrip(el_val_t s);
/* Char classification (Bool) */
el_val_t is_letter(el_val_t s);
el_val_t is_digit(el_val_t s);
el_val_t is_alphanumeric(el_val_t s);
el_val_t is_whitespace(el_val_t s);
el_val_t is_punctuation(el_val_t s);
el_val_t is_uppercase(el_val_t s);
el_val_t is_lowercase(el_val_t s);
/* Split / join */
el_val_t str_split_lines(el_val_t s);
el_val_t str_split_chars(el_val_t s); /* alias of native_string_chars */
el_val_t str_split_n(el_val_t s, el_val_t sep, el_val_t n);
el_val_t str_join(el_val_t list, el_val_t sep); /* alias of list_join */
/* ── List additions ──────────────────────────────────────────────────────── */
el_val_t list_push(el_val_t list, el_val_t elem);