From d3d8295f1be86253d294942cdfcd3ebadd24bff6 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor@ccxvii.net>
Date: Tue, 21 Jun 2022 12:00:38 +0200
Subject: Don't use JSON for undo.

---
 rules.js | 58 ++++++++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 42 insertions(+), 16 deletions(-)

diff --git a/rules.js b/rules.js
index c65aae8..a331a05 100644
--- a/rules.js
+++ b/rules.js
@@ -332,28 +332,54 @@ function remove_from_array(array, item) {
 		array.splice(i, 1);
 }
 
-function clear_undo() {
-	if (game.undo)
-		game.undo.length = 0;
-	else
-		game.undo = [];
+function deep_copy(original) {
+	if (Array.isArray(original)) {
+		let n = original.length
+		let copy = new Array(n)
+		for (let i = 0; i < n; ++i) {
+			let v = original[i]
+			if (typeof v === "object" && v !== null)
+				copy[i] = deep_copy(v)
+			else
+				copy[i] = v
+		}
+		return copy
+	} else {
+		let copy = {}
+		for (let i in original) {
+			let v = original[i]
+			if (typeof v === "object" && v !== null)
+				copy[i] = deep_copy(v)
+			else
+				copy[i] = v
+		}
+		return copy
+	}
 }
 
 function push_undo() {
-	game.undo.push(JSON.stringify(game, (k,v) => {
-		if (k === 'undo') return 0;
-		if (k === 'log') return v.length;
-		return v;
-	}));
+	let copy = {}
+	for (let k in game) {
+		let v = game[k]
+		if (k === "undo") continue
+		else if (k === "log") v = v.length
+		else if (typeof v === "object" && v !== null) v = deep_copy(v)
+		copy[k] = v
+	}
+	game.undo.push(copy)
 }
 
 function pop_undo() {
-	let undo = game.undo;
-	let save_log = game.log;
-	game = JSON.parse(undo.pop());
-	game.undo = undo;
-	save_log.length = game.log;
-	game.log = save_log;
+	let save_log = game.log
+	let save_undo = game.undo
+	game = save_undo.pop()
+	save_log.length = game.log
+	game.log = save_log
+	game.undo = save_undo
+}
+
+function clear_undo() {
+	game.undo = []
 }
 
 function gen_action_undo(view) {
-- 
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