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omit source location in history when unambiguous

This commit is contained in:
Jesse D. McDonald 2020-03-15 12:51:20 -05:00
parent cbb8c28542
commit 2248ff2794
1 changed files with 71 additions and 20 deletions
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91
js/chess.js
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@ -350,12 +350,26 @@ function movePiece(priorBoard, side, from, to){
return board;
}
function renderHistory(board) {
function findPieces(board, side, type){
let pieces = [];
for (const row of "12345678") {
for (const column of "abcdefgh") {
const here = column + row;
if (boardGet(board, here, side) === type) {
pieces.push(here);
}
}
}
return pieces;
}
function renderHistory(currentBoard) {
let list = [];
while (board && board.move) {
list.push(board.move);
board = board.prior;
for (let board = currentBoard; board && board.move; board = board.prior) {
list.push(board);
}
const NBSP = '\u00a0'; /* non-breaking space */
@ -366,11 +380,11 @@ function renderHistory(board) {
let n = 0;
while (list.length > 0) {
const move = list.pop();
const board = list.pop();
const move = board.move;
if (move.from === 'phantom') {
const piece = move.type === 'p' ? '' : move.type.toUpperCase();
const took = move.took ? 'x' : '';
result += SHY + '*' + piece + took + move.to;
result += SHY + '*';
} else {
if (n > 0 || isDark(move.side)) {
result += ' ';
@ -380,24 +394,61 @@ function renderHistory(board) {
++n;
result += String(n) + '.' + NBSP;
}
}
if (move.pass) {
result += '...';
} else if (move.alongside) {
if (move.pass) {
result += '...';
} else if (move.castle) {
result += 'O-O';
} else if (move.queen_castle) {
result += 'O-O-O';
} else {
let piece = '';
if (move.alongside) {
if (isLight(move.side)) {
result += move.type.toUpperCase() + move.alongside.toUpperCase() + move.from + move.to;
piece = move.type.toUpperCase() + move.alongside.toUpperCase();
} else {
result += move.alongside.toUpperCase() + move.type.toUpperCase() + move.from + move.to;
piece = move.alongside.toUpperCase() + move.type.toUpperCase();
}
} else if (move.castle) {
result += 'O-O';
} else if (move.queen_castle) {
result += 'O-O-O';
} else {
const piece = move.type === 'p' ? '' : move.type.toUpperCase();
const took = move.took ? 'x' : '';
result += piece + move.from + took + move.to;
piece = move.type === 'p' ? '' : move.type.toUpperCase();
}
if (move.from !== 'phantom') {
const sameKind = findPieces(board.prior, move.side, move.type);
const legalFrom = [];
let sameFile = 0; /* column / letter */
let sameRank = 0; /* row / number */
for (const where of sameKind) {
if (legalMoves(board.prior, move.side, move.type, where, true).includes(move.to)) {
legalFrom.push(where);
if (where[0] === move.from[0]) {
sameFile += 1;
}
if (where[1] === move.from[1]) {
sameRank += 1;
}
}
}
if (legalFrom.length !== 1) {
/* append file, rank, or both to disambiguate */
if (sameFile === 1) {
piece += move.from[0];
} else if (sameRank === 1) {
piece += move.from[1];
} else {
piece += move.from;
}
}
}
const took = move.took ? 'x' : '';
result += piece + took + move.to;
}
if (move.en_passant) {