From: Steinar H. Gunderson <sgunderson@bigfoot.com>
Date: Tue, 27 Dec 2022 17:15:54 +0000 (+0100)
Subject: Faster and smaller update_imbalance().
X-Git-Url: https://git.sesse.net/?p=remoteglot;a=commitdiff_plain;h=a672cdf742583ecb42116f3b5e12c18dd3b37cf5

Faster and smaller update_imbalance().
---

diff --git a/www/js/remoteglot.js b/www/js/remoteglot.js
index 27ded16..be32c44 100644
--- a/www/js/remoteglot.js
+++ b/www/js/remoteglot.js
@@ -1827,23 +1827,19 @@ let update_historic_analysis = function() {
  * @param {string} fen
  */
 let update_imbalance = function(fen) {
-	let hiddenboard = new Chess(fen);
 	let imbalance = {'k': 0, 'q': 0, 'r': 0, 'b': 0, 'n': 0, 'p': 0};
-	for (let row = 0; row < 8; ++row) {
-		for (let col = 0; col < 8; ++col) {
-			let col_text = String.fromCharCode('a1'.charCodeAt(0) + col);
-			let row_text = String.fromCharCode('a1'.charCodeAt(1) + row);
-			let square = col_text + row_text;
-			let contents = hiddenboard.get(square);
-			if (contents !== null) {
-				if (contents.color === 'w') {
-					++imbalance[contents.type];
-				} else {
-					--imbalance[contents.type];
-				}
-			}
+	for (const c of fen) {
+		if (c === ' ') {
+			// End of board
+			break;
+		}
+		if (c != c.toUpperCase()) {
+			--imbalance[c];
+		} else if (c != c.toLowerCase()) {
+			++imbalance[c.toLowerCase()];
 		}
 	}
+
 	let white_imbalance = document.getElementById('whiteimbalance');
 	let black_imbalance = document.getElementById('blackimbalance');
 	white_imbalance.textContent = '';