From 7e69446ac4b5becb9da0694e7bbc14799fec9dec Mon Sep 17 00:00:00 2001
From: sapphi-red <green@sapphi.red>
Date: Sat, 2 Sep 2023 20:58:09 +0900
Subject: [PATCH 1/2] Improve stringify_string performance

---
 src/utils.js | 46 ++++------------------------------------------
 1 file changed, 4 insertions(+), 42 deletions(-)

diff --git a/src/utils.js b/src/utils.js
index 5dea3ef..c0fc375 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -50,50 +50,12 @@ export function get_type(thing) {
 	return Object.prototype.toString.call(thing).slice(8, -1);
 }
 
-/** @param {string} char */
-function get_escaped_char(char) {
-	switch (char) {
-		case '"':
-			return '\\"';
-		case '<':
-			return '\\u003C';
-		case '\\':
-			return '\\\\';
-		case '\n':
-			return '\\n';
-		case '\r':
-			return '\\r';
-		case '\t':
-			return '\\t';
-		case '\b':
-			return '\\b';
-		case '\f':
-			return '\\f';
-		case '\u2028':
-			return '\\u2028';
-		case '\u2029':
-			return '\\u2029';
-		default:
-			return char < ' '
-				? `\\u${char.charCodeAt(0).toString(16).padStart(4, '0')}`
-				: '';
-	}
-}
-
+const escape_chars = /["<\\\n\r\t\b\f\u2028\u2029\x00-\x1f]/
 /** @param {string} str */
 export function stringify_string(str) {
-	let result = '';
-	let last_pos = 0;
-	const len = str.length;
-
-	for (let i = 0; i < len; i += 1) {
-		const char = str[i];
-		const replacement = get_escaped_char(char);
-		if (replacement) {
-			result += str.slice(last_pos, i) + replacement;
-			last_pos = i + 1;
-		}
+	if (!escape_chars.test(str)){
+		return `"${str}"`;
 	}
 
-	return `"${last_pos === 0 ? str : result + str.slice(last_pos)}"`;
+	return JSON.stringify(str).replace(/[<\u2028\u2029]/g, char => escaped[char]);
 }

From ad3caf0ec49c0438a825e1c9e2526c9d23846167 Mon Sep 17 00:00:00 2001
From: sapphi-red <49056869+sapphi-red@users.noreply.github.com>
Date: Tue, 2 Jul 2024 00:01:18 +0900
Subject: [PATCH 2/2] Avoid callback function in replace

---
 src/utils.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/utils.js b/src/utils.js
index 3aa2d5c..ed2a92d 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -51,13 +51,19 @@ export function get_type(thing) {
 }
 
 const escape_chars = /["<\\\n\r\t\b\f\u2028\u2029\x00-\x1f]/
+const u2028_all = /\u2028/g;
+const u2029_all = /\u2029/g;
+const lt_all = /</g;
 /** @param {string} str */
 export function stringify_string(str) {
 	if (!escape_chars.test(str)){
 		return `"${str}"`;
 	}
 
-	return JSON.stringify(str).replace(/[<\u2028\u2029]/g, char => escaped[char]);
+	return JSON.stringify(str)
+		.replace(u2028_all, '\\u2028')
+		.replace(u2029_all, '\\u2029')
+		.replace(lt_all, '\\u003C');
 }
 
 /** @param {Record<string | symbol, any>} object */