hare

commit e056f10e534e4dc27a15bea49514bfdae553f420
parent 261cf7daff3f56b03c0829f19fad4039032fbd42
Author: Vlad-Stefan Harbuz <vlad@vlad.website>
Date:   Sat,  7 Dec 2024 23:13:05 +0000

regex: document and test split insertion

Signed-off-by: Vlad-Stefan Harbuz <vlad@vlad.website>

Diffstat:
M
regex/+test.ha
 | 
2
++
M
regex/regex.ha
 | 
4
++++

2 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/regex/+test.ha b/regex/+test.ha
@@ -412,6 +412,8 @@ fn run_rawreplace_case(
 		(`^x(abc){,2}$`, "xabc", matchres::MATCH, 0, -1),
 		(`^x(abc){,2}$`, "xabcabc", matchres::MATCH, 0, -1),
 		(`^x(abc){,2}`, "xabcabcabc", matchres::MATCH, 0, 7),
+		(`^x(abc){,0}de`, "xde", matchres::MATCH, 0, -1),
+		(`^x(abc){,0}de`, "xe", matchres::NOMATCH, 0, -1),
 		(`^x(abc){,2}$`, "xabcabcabc", matchres::NOMATCH, 0, -1),
 		(`^x(abc){1,}$`, "xabc", matchres::MATCH, 0, -1),
 		(`^x(abc){1,}$`, "xabcabc", matchres::MATCH, 0, -1),
diff --git a/regex/regex.ha b/regex/regex.ha
@@ -345,6 +345,10 @@ export fn compile(expr: str) (regex | error) = {
 				yield rep_parts.0;
 			};
 			if (can_skip) {
+				// len(insts) - 1 is the current last instruction
+				// len(insts) is the next instruction
+				// advance to len(insts) + 1 to make space for the `inst_split`
+				// advance to len(insts) + 2 to make space for the `inst_repeat`
 				insert(insts[origin],
 					len(insts) + 2: inst_split);
 				origin += 1;