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Add piece promotion

This commit is contained in:
Juhani Krekelä 2021-01-07 23:23:36 +02:00
parent 1d65249948
commit 1e06e07a10
1 changed files with 52 additions and 17 deletions
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69
shatrizualizer.html
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@ -194,6 +194,7 @@
return;
}
// Piece
let piece = move.slice(0, 1);
let index = 0;
switch(piece) {
@ -220,6 +221,7 @@
return;
}
// Start square
let startLetter = move.slice(index, index + 1);
let startNumber = move.slice(index + 1, index + 2);
index += 2;
@ -231,12 +233,14 @@
return;
}
// Capturing
let captures = false;
if (move.slice(index, index + 1) === 'x') {
captures = true;
index++;
}
// End square
let endLetter = move.slice(index, index + 1);
let endNumber = move.slice(index + 1, index + 2);
index += 2;
@ -248,6 +252,33 @@
return;
}
// Promotion
let promotion = null;
if (move.slice(index, index + 1) === '=') {
index++;
switch (move.slice(index, index + 1)) {
case 'Q':
case 'B':
case 'N':
case 'R':
promotion = move.slice(index, index + 1);
break;
case 'K':
alert('Cannot promote a piece to king');
return;
break;
case 'P':
alert('Cannot promote a piece to pawn');
return;
break;
default:
alert('Unrecognized piece: ' + move.slice(index, index + 1));
return;
}
index++;
}
// Check(mate)
switch(move.slice(index)) {
case '':
// nothing
@ -263,16 +294,16 @@
return;
}
// End of parsing, start of move construction
let whitePieces = {'K': '♔', 'Q': '♕', 'R': '♖', 'B': '♗', 'N': '♘', 'P': '♙'};
let blackPieces = {'K': '♚', 'Q': '♛', 'R': '♜', 'B': '♝', 'N': '♞', 'P': '♟'};
let whiteMove = document.getElementById('tomove').childNodes[0].data == 'White';
let renderedPiece = null;
if (whiteMove) {
renderedPiece = whitePieces[piece];
} else {
renderedPiece = blackPieces[piece];
let renderedPiece = whiteMove ? whitePieces[piece] : blackPieces[piece];
let renderedPromotion = null;
if (promotion) {
renderedPromotion = whiteMove ? whitePieces[promotion] : blackPieces[promotion];
}
// Are we moving the piece from where it is located?
@ -282,7 +313,7 @@
return;
}
if (startSquare.childNodes[0].data !== renderedPiece) {
let pieceNames = {'K': 'King', 'Q': 'Vizier', 'R': 'Rook', 'B': 'Elephant', 'N': 'Horse', 'P': 'Pawn'};
let pieceNames = {'K': 'king', 'Q': 'vizier', 'R': 'rook', 'B': 'elephant', 'N': 'horse', 'P': 'pawn'};
alert((whiteMove ? 'White' : 'Black') + ' ' + pieceNames[piece] + ' not on square ' + startLetter + startNumber);
return;
}
@ -301,17 +332,21 @@
}
// Record our alterations to the table
let movedPiece = {start: startLetter + startNumber, end: endLetter + endNumber, piece: renderedPiece};
let capturedPiece = captures ? endSquare.childNodes[0].data : null;
moveHistory.push({move: movedPiece, capture: capturedPiece});
console.log(moveHistory);
let moveRecord = {
start: startLetter + startNumber,
end: endLetter + endNumber,
startPiece: renderedPiece,
endPiece: promotion ? renderedPromotion : renderedPiece,
capturedPiece: captures ? endSquare.childNodes[0].data : null
};
moveHistory.push(moveRecord);
// Apply move
if (captures) {
endSquare.removeChild(endSquare.childNodes[0]);
}
startSquare.removeChild(startSquare.childNodes[0]);
endSquare.appendChild(document.createTextNode(renderedPiece))
endSquare.appendChild(document.createTextNode(promotion ? renderedPromotion : renderedPiece))
// Flip whose turn it is
document.getElementById('tomove').childNodes[0].data = whiteMove ? 'Black' : 'White';
@ -332,13 +367,13 @@
}
// Undo move on the board
let {move, capture} = moveHistory.pop();
let startSquare = document.getElementById(move.start);
let endSquare = document.getElementById(move.end);
let {start, end, startPiece, endPiece, capturedPiece} = moveHistory.pop();
let startSquare = document.getElementById(start);
let endSquare = document.getElementById(end);
endSquare.removeChild(endSquare.childNodes[0]);
startSquare.appendChild(document.createTextNode(move.piece));
if (capture) {
endSquare.appendChild(document.createTextNode(capture));
startSquare.appendChild(document.createTextNode(startPiece));
if (capturedPiece) {
endSquare.appendChild(document.createTextNode(capturedPiece));
}
// Flip whose turn it is