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factor out the code to diff game history into a utility function

This commit is contained in:
Jesse D. McDonald 2020-05-02 18:12:52 -05:00
parent 66b1bb05f6
commit 5be70b8891
1 changed files with 76 additions and 48 deletions
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124
js/pacosako.js
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@ -397,6 +397,69 @@ function addHistory(game) {
game._history += result;
}
function diffHistory(game1, game2) {
let prefixLength = 0;
while (prefixLength < game1._moves.length && prefixLength < game2._moves.length) {
const move1 = game1._moves[prefixLength];
const move2 = game2._moves[prefixLength];
if (move2.resign !== move1.resign ||
move2.from !== move1.from ||
move2.to !== move1.to) {
break;
}
prefixLength += 1;
}
const hist = new Game(game1._history === undefined ? game2 : game1);
game1 = undefined;
hist.clearRedo();
while (hist._moves.length > prefixLength) {
hist.undo();
hist.clearRedo();
}
const turn_before = hist._turn;
const history_before = hist.renderHistory();
hist.ignoreCheck = game2.ignoreCheck;
for (const move of game2._moves.slice(prefixLength)) {
if (hist._player !== move.side) {
if (hist._player === LIGHT) {
hist._turn += 1;
hist._history += `${hist._turn === 1 ? '' : ' '}${hist._turn}.${NBSP}…`;
} else {
hist._history += ` …`;
}
hist._player = move.side;
}
try {
hist._status = PLAYING;
hist.replayMove(move);
} catch(err) {
try {
hist.ignoreCheck = true;
hist.replayMove(move);
hist.ignoreCheck = game2.ignoreCheck;
} catch(err) {
return undefined;
}
}
}
let suffix = hist.history.slice(history_before.length).trimStart();
if (!suffix.match(/^\d+\./)) {
suffix = `${turn_before}.${NBSP}… ${suffix}`;
}
return suffix;
}
class Game {
constructor(original) {
if (original !== undefined) {
@ -689,28 +752,12 @@ class Game {
if (sim.isLegalMove(other, from, king, true)) {
/* this piece can directly capture the king */
let check = true;
try {
if (this._history !== undefined) {
const hist = new Game(this);
hist.ignoreCheck = true;
if (hist._player !== other) {
if (hist._player === LIGHT) {
hist._turn += 1;
hist._history += ` ${hist._turn}.${NBSP}…`;
} else {
hist._history += ` …`;
}
hist._player = other;
}
const turn_before = hist._turn;
const history_before = hist._history;
hist.move(from, king);
check = hist.history.slice(history_before.length).trimStart();
if (!check.match(/^\d+\./)) {
check = `${turn_before}.${NBSP}… ${check}`;
}
}
} catch(err) {}
if (this._history !== undefined) {
try {
sim.move(from, king);
check = diffHistory(this, sim) || true;
} catch(err) {}
}
return recordCheck(this, check);
}
@ -761,31 +808,12 @@ class Game {
if (game2.isLegalMove(other, PHANTOM, king, true)) {
/* we have our answer */
let check = true;
try {
if (this._history !== undefined) {
const hist = new Game(this);
hist.ignoreCheck = true;
if (hist._player !== other) {
if (hist._player === LIGHT) {
hist._turn += 1;
hist._history += ` ${hist._turn}.${NBSP}…`;
} else {
hist._history += ` …`;
}
hist._player = other;
}
const turn_before = hist._turn;
const history_before = hist._history;
for (const move of game2._moves.slice(hist._moves.length)) {
hist.replayMove(move);
}
hist.move(PHANTOM, king);
check = hist.history.slice(history_before.length).trimStart();
if (!check.match(/^\d+\./)) {
check = `${turn_before}.${NBSP}… ${check}`;
}
}
} catch(err) {}
if (this._history !== undefined) {
try {
game2.move(PHANTOM, king);
check = diffHistory(this, game2) || true;
} catch(err) {}
}
return recordCheck(this, check);
}
@ -1163,7 +1191,7 @@ export default {
ROWS, COLUMNS, PHANTOM,
/* Miscellaneous */
Util: { otherSide, offsetSquare },
Util: { otherSide, offsetSquare, diffHistory },
};
/* vim:set expandtab sw=3 ts=8: */