From: Benjamin Auder Date: Mon, 12 Sep 2022 14:04:12 +0000 (+0200) Subject: Complete FenUtil draft. Untested X-Git-Url: https://git.auder.net/?p=xogo.git;a=commitdiff_plain;h=0adfbdb55452c79532875beb8eed61b1ed4c6cd2 Complete FenUtil draft. Untested --- diff --git a/base_rules.js b/base_rules.js index b315fd5..cdce2a1 100644 --- a/base_rules.js +++ b/base_rules.js @@ -1,5 +1,6 @@ import {Random} from "/utils/alea.js"; import {ArrayFun} from "/utils/array.js"; +import {FenUtil} from "/utils/setupPieces.js"; import PiPo from "/utils/PiPo.js"; import Move from "/utils/Move.js"; @@ -215,66 +216,17 @@ export default class ChessRules { // Setup the initial random-or-not (asymmetric-or-not) position genRandInitBaseFen() { - let fen, flags = "0707"; - if (!this.options.randomness) - // Deterministic: - fen = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR"; - - else { - // Randomize - let pieces = {w: new Array(8), b: new Array(8)}; - flags = ""; - // Shuffle pieces on first (and last rank if randomness == 2) - for (let c of ["w", "b"]) { - if (c == 'b' && this.options.randomness == 1) { - pieces['b'] = pieces['w']; - flags += flags; - break; - } - let positions = ArrayFun.range(8); - // Get random squares for bishops - let randIndex = 2 * Random.randInt(4); - const bishop1Pos = positions[randIndex]; - // The second bishop must be on a square of different color - let randIndex_tmp = 2 * Random.randInt(4) + 1; - const bishop2Pos = positions[randIndex_tmp]; - // Remove chosen squares - positions.splice(Math.max(randIndex, randIndex_tmp), 1); - positions.splice(Math.min(randIndex, randIndex_tmp), 1); - // Get random squares for knights - randIndex = Random.randInt(6); - const knight1Pos = positions[randIndex]; - positions.splice(randIndex, 1); - randIndex = Random.randInt(5); - const knight2Pos = positions[randIndex]; - positions.splice(randIndex, 1); - // Get random square for queen - randIndex = Random.randInt(4); - const queenPos = positions[randIndex]; - positions.splice(randIndex, 1); - // Rooks and king positions are now fixed, - // because of the ordering rook-king-rook - const rook1Pos = positions[0]; - const kingPos = positions[1]; - const rook2Pos = positions[2]; - // Finally put the shuffled pieces in the board array - pieces[c][rook1Pos] = "r"; - pieces[c][knight1Pos] = "n"; - pieces[c][bishop1Pos] = "b"; - pieces[c][queenPos] = "q"; - pieces[c][kingPos] = "k"; - pieces[c][bishop2Pos] = "b"; - pieces[c][knight2Pos] = "n"; - pieces[c][rook2Pos] = "r"; - flags += rook1Pos.toString() + rook2Pos.toString(); + const s = FenUtil.setupPieces( + ['r', 'n', 'b', 'q', 'k', 'b', 'n', 'r'], + { + between: {p1: 'k', p2: 'r'}, + diffCol: ['b'] } - fen = ( - pieces["b"].join("") + - "/pppppppp/8/8/8/8/PPPPPPPP/" + - pieces["w"].join("").toUpperCase() - ); - } - return { fen: fen, o: {flags: flags} }; + ); + return { + fen: s.b + "/pppppppp/8/8/8/8/PPPPPPPP/" + s.w, + o: {flags: s.flags} + }; } // "Parse" FEN: just return untransformed string data diff --git a/utils/alea.js b/utils/alea.js index 077970d..d892824 100644 --- a/utils/alea.js +++ b/utils/alea.js @@ -26,6 +26,10 @@ export const Random = { return Math.floor(Random.rand() * (max - min)) + min; }, + randBool: function() { + return Random.randInt(0, 2) == 0; + }, + // Inspired by https://github.com/jashkenas/underscore sample: function(arr, n) { n = n || 1; diff --git a/utils/setupPieces.js b/utils/setupPieces.js index f0a8cfc..988903e 100644 --- a/utils/setupPieces.js +++ b/utils/setupPieces.js @@ -1,6 +1,6 @@ import {Random} from "/utils/alea.js"; -export class Fenutil = { +export class FenUtil = { // arg o (constraints): "between" with p1 and p2. // "flags", "diffCol": array of pieceType @@ -15,84 +15,51 @@ export class Fenutil = { flags += i; }); } + if (o.diffCol) { + o.diffCol.forEach(p => { + // Pieces of type p on different colors: + const firstP = res.indexOf(p), + lastP = res.lastIndexOf(p); + if ((firstP - lastP) % 2 != 0) { + const choice1 = Random.randBool() ? firstP : lastP; + let choice2; + do { + choice2 = Random.randInt(arr.length); + } + while ( + choice2 == choice1 || + o.diffCol.includes(choice2) || + (choice2 - choice1) % 2 != 0 + ); + res[choice1] = res[choice2]; + res[choice2] = p; + } + }); + } if (o.between) { // Locate p1. If appearing first, exchange with first p2. // If appearing last, exchange with last p2. - res.findIndex(p => p == o.between["p1"]) + const p1 = res.indexOf(o.between["p1"]); + const firstP2 = res.indexOf(o.between["p2"]), + lastP2 = res.lastIndexOf(o.between["p2"]); + if (p1 < firstP2 || p1 > lastP2) { + res[p1] = o.between["p2"]; + if (p1 < firstP2) + res[firstP2] = o.between["p1"]; + else //p1 > lastP2 + res[lastP2] = o.between["p1"]; + } } - return {fen: res, flags: flags}; } setupPieces(arr, o) { - if (o.randomness == 0) - - + const row1 = FenUtil.setupRow(arr, o); + const row2 = o.randomness == 2 ? FenUtil.setupRow(arr, o) : row1; return { - row1: - - - + w: row1.fen.toUpperCase, + b: row2.fen, + flags: row1.flags + row2.flags + }; } }; - -let fen, flags = "0707"; - if (!this.options.randomness) - // Deterministic: - fen = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR"; - - else { - // Randomize - let pieces = {w: new Array(8), b: new Array(8)}; - flags = ""; - // Shuffle pieces on first (and last rank if randomness == 2) - for (let c of ["w", "b"]) { - if (c == 'b' && this.options.randomness == 1) { - pieces['b'] = pieces['w']; - flags += flags; - break; - } - let positions = ArrayFun.range(8); - // Get random squares for bishops - let randIndex = 2 * Random.randInt(4); - const bishop1Pos = positions[randIndex]; - // The second bishop must be on a square of different color - let randIndex_tmp = 2 * Random.randInt(4) + 1; - const bishop2Pos = positions[randIndex_tmp]; - // Remove chosen squares - positions.splice(Math.max(randIndex, randIndex_tmp), 1); - positions.splice(Math.min(randIndex, randIndex_tmp), 1); - // Get random squares for knights - randIndex = Random.randInt(6); - const knight1Pos = positions[randIndex]; - positions.splice(randIndex, 1); - randIndex = Random.randInt(5); - const knight2Pos = positions[randIndex]; - positions.splice(randIndex, 1); - // Get random square for queen - randIndex = Random.randInt(4); - const queenPos = positions[randIndex]; - positions.splice(randIndex, 1); - // Rooks and king positions are now fixed, - // because of the ordering rook-king-rook - const rook1Pos = positions[0]; - const kingPos = positions[1]; - const rook2Pos = positions[2]; - // Finally put the shuffled pieces in the board array - pieces[c][rook1Pos] = "r"; - pieces[c][knight1Pos] = "n"; - pieces[c][bishop1Pos] = "b"; - pieces[c][queenPos] = "q"; - pieces[c][kingPos] = "k"; - pieces[c][bishop2Pos] = "b"; - pieces[c][knight2Pos] = "n"; - pieces[c][rook2Pos] = "r"; - flags += rook1Pos.toString() + rook2Pos.toString(); - } - fen = ( - pieces["b"].join("") + - "/pppppppp/8/8/8/8/PPPPPPPP/" + - pieces["w"].join("").toUpperCase() - ); - } - return { fen: fen, o: {flags: flags} };