From b0983283d05ba4ad66c4e886a0a290b425b2991a Mon Sep 17 00:00:00 2001
From: EuAndreh <eu@euandre.org>
Date: Fri, 11 Jul 2025 21:24:52 -0300
Subject: src/paca.mjs (tokenizeRegexStep): Fix missing concat when escaping

---
 src/paca.mjs | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/src/paca.mjs b/src/paca.mjs
index 078a824..b30d4cd 100644
--- a/src/paca.mjs
+++ b/src/paca.mjs
@@ -31,13 +31,13 @@ const numFromDigits = digits =>
 
 const tokenizeRegexStep = chars => ({ out, state, context }, char, index) => {
 	const next = chars[index + 1];
-	const maybeConcat = shouldConcat(char, next)
-		? [{operator: "concat"}]
-		: [];
 
 	if (state === ConcatStep.ESCAPING) {
 		return {
-			out: out.concat(char, maybeConcat),
+			out: out.concat(
+				char,
+				next !== undefined ? {operator: "concat"} : [],
+			),
 			state: ConcatStep.ACCEPTING,
 			context,
 		};
@@ -143,7 +143,10 @@ const tokenizeRegexStep = chars => ({ out, state, context }, char, index) => {
 
 	const op = isOperator(char) ? { operator: char } : char;
 	return {
-		out: out.concat(op, maybeConcat),
+		out: out.concat(
+			op,
+			shouldConcat(char, next) ? [{operator: "concat"}] : [],
+		),
 		state,
 		context,
 	};
-- 
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