hare

commit a04c25428ea6c7c072ce6232e1077999b7262886
parent 55c85ddc6687ec6a5d630ca5f062178c9a762914
Author: Byron Torres <b@torresjrjr.com>
Date:   Sat, 14 Jan 2023 23:14:46 +0000

strings: add runelen()

Signed-off-by: Byron Torres <b@torresjrjr.com>

Diffstat:
M
strings/runes.ha
 | 
15
+++++++++++++++

1 file changed, 15 insertions(+), 0 deletions(-)
diff --git a/strings/runes.ha b/strings/runes.ha
@@ -24,6 +24,21 @@ export fn fromrunes(runes: []rune) str = {
 	return fromutf8_unsafe(bytes);
 };
 
+// Returns a string's rune-length; the number of runes encoded in a string.
+export fn runelen(s: str) size = {
+	let it = iter(s);
+	let n = 0z;
+	for (true) {
+		match (next(&it)) {
+		case rune =>
+			n += 1;
+		case done =>
+			break;
+		};
+	};
+	return n;
+};
+
 @test fn fromrunes() void = {
 	const tests: [_](str, []rune) = [
 		("Harriet", ['H', 'a', 'r', 'r', 'i', 'e', 't']),