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2 Commits
56d64c813e
...
881a9b803c
Author | SHA1 | Date |
---|---|---|
Juhani Krekelä | 881a9b803c | |
Juhani Krekelä | e9f6480d90 |
46
takhta.html
46
takhta.html
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@ -207,6 +207,13 @@
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return;
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}
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let ret = doMove(move);
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if ('error' in ret) {
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alert(ret.error);
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}
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}
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function doMove(move) {
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// Piece
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let piece = move.slice(0, 1);
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let index = 0;
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@ -230,8 +237,7 @@
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piece = 'P';
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break;
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default:
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alert('Not a valid piece: ' + piece);
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return;
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return {error: 'Not a valid piece: ' + piece};
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}
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// Start square
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@ -242,8 +248,7 @@
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startLetter === '' || !'abcdefgh'.includes(startLetter) ||
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startNumber === '' || !'12345678'.includes(startNumber)
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) {
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alert('Not a valid coordinate: ' + startLetter + startNumber);
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return;
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return {error: 'Not a valid coordinate: ' + startLetter + startNumber};
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}
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// Capturing
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@ -261,8 +266,7 @@
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endLetter === '' || !'abcdefgh'.includes(endLetter) ||
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endNumber === '' || !'12345678'.includes(endNumber)
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) {
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alert('Not a valid coordinate: ' + endLetter + endNumber);
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return;
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return {error: 'Not a valid coordinate: ' + endLetter + endNumber};
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}
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// Promotion
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@ -277,16 +281,13 @@
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promotion = move.slice(index, index + 1);
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break;
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case 'K':
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alert('Cannot promote a piece to king');
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return;
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return {error: 'Cannot promote a piece to king'};
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break;
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case 'P':
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alert('Cannot promote a piece to pawn');
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return;
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return {error: 'Cannot promote a piece to pawn'};
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break;
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default:
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alert('Unrecognized piece: ' + move.slice(index, index + 1));
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return;
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return {error: 'Unrecognized piece: ' + move.slice(index, index + 1)};
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}
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index++;
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}
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@ -300,11 +301,11 @@
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// TODO: Check
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break;
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case '++':
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case '#':
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// TODO: Checkmate'
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break;
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default:
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alert('Unexpected contents at the end of the move: ' + move.slice(index));
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return;
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return {error: 'Unexpected contents at the end of the move: ' + move.slice(index)};
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}
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// End of parsing, start of move construction
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@ -321,20 +322,17 @@
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// Are we moving the piece onto itself?
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if (startLetter === endLetter && startNumber === endNumber) {
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alert('Start and end squares of the move cannot be identical');
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return;
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return {error: 'Start and end squares of the move cannot be identical'};
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}
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// Are we moving the piece from where it is located?
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let startSquare = document.getElementById(startLetter + startNumber);
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if (startSquare.childNodes.length === 0) {
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alert('No piece on square ' + startLetter + startNumber);
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return;
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return {error: 'No piece on square ' + startLetter + startNumber};
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}
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if (startSquare.childNodes[0].data !== renderedPiece) {
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let pieceNames = {'K': 'king', 'Q': 'vizier', 'R': 'rook', 'B': 'elephant', 'N': 'horse', 'P': 'pawn'};
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alert((whiteMove ? 'White' : 'Black') + ' ' + pieceNames[piece] + ' not on square ' + startLetter + startNumber);
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return;
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return {error: (whiteMove ? 'White' : 'Black') + ' ' + pieceNames[piece] + ' not on square ' + startLetter + startNumber};
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}
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// TODO: Check piece is allowed to move like that
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@ -342,12 +340,10 @@
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// Can the piece move to this location?
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let endSquare = document.getElementById(endLetter + endNumber);
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if (endSquare.childNodes.length !== 0 && !captures) {
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alert('Square ' + endLetter + endNumber + ' is occupied, did you mean to capture?');
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return;
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return {error: 'Square ' + endLetter + endNumber + ' is occupied, did you mean to capture?'};
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}
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if (endSquare.childNodes.length === 0 && captures) {
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alert('Square ' + endLetter + endNumber + ' empty even though capture was specified');
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return;
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return {error: 'Square ' + endLetter + endNumber + ' empty even though capture was specified'};
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}
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// Record our alterations to the table
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@ -377,6 +373,8 @@
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// Empty input field
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document.getElementById('move').value = '';
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return {}
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}
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function undoMove() {
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