From 75f6b58dae1101606078bf18155bcc80dac0a688 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor@ccxvii.net>
Date: Mon, 20 Jun 2022 23:24:54 +0200
Subject: Don't use JSON for undo.

---
 rules.js | 55 ++++++++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 42 insertions(+), 13 deletions(-)

diff --git a/rules.js b/rules.js
index 6c0aec0..44ad947 100644
--- a/rules.js
+++ b/rules.js
@@ -209,25 +209,54 @@ function logi(msg) {
 	game.log.push(">" + msg)
 }
 
-function clear_undo() {
-	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 save_undo = game.undo
 	let save_log = game.log
-	game = JSON.parse(save_undo.pop())
-	game.undo = save_undo
+	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(action, argument=undefined) {
@@ -3045,6 +3074,9 @@ exports.setup = function (seed, scenario, options) {
 
 	game = {
 		seed: seed,
+		log: [],
+		undo: [],
+
 		open: options.open_hands ? 1 : 0,
 
 		active: 0,
@@ -3074,9 +3106,6 @@ exports.setup = function (seed, scenario, options) {
 			[0,0,0,0,0,0],
 		],
 		players: [],
-
-		log: [],
-		undo: [],
 	}
 
 	for (let i = 0; i < player_count; ++i) {
-- 
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