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Add index-of string primitive: spec, Python, JS, rebootstrap

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(index-of s needle from?) returns first index of needle in s, or -1.
Optional start offset. Specced in primitives.sx, implemented in both
hand-written primitives.py and bootstrapper templates, rebootstrapped.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
giles
2026-03-06 09:48:44 +00:00
parent e6cada972e
commit e112bffe5c
7 changed files with 16 additions and 141 deletions
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shared/sx/ref/bootstrap_js.py
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@@ -1386,6 +1386,7 @@ PRIMITIVES_JS_MODULES: dict[str, str] = {
PRIMITIVES["split"] = function(s, sep) { return String(s).split(sep || " "); };
PRIMITIVES["join"] = function(sep, coll) { return coll.join(sep); };
PRIMITIVES["replace"] = function(s, old, nw) { return s.split(old).join(nw); };
PRIMITIVES["index-of"] = function(s, needle, from) { return String(s).indexOf(needle, from || 0); };
PRIMITIVES["starts-with?"] = function(s, p) { return String(s).indexOf(p) === 0; };
PRIMITIVES["ends-with?"] = function(s, p) { var str = String(s); return str.indexOf(p, str.length - p.length) !== -1; };
PRIMITIVES["slice"] = function(c, a, b) { return b !== undefined ? c.slice(a, b) : c.slice(a); };