Commit | Line | Data |
---|---|---|
0c3fe8a6 BA |
1 | import { ChessRules } from "@/base_rules"; |
2 | ||
3 | export const VariantRules = class ZenRules extends ChessRules | |
1d184b4c | 4 | { |
33ee1916 | 5 | // NOTE: enPassant, if enabled, would need to redefine carefully getEpSquare |
fb6ceeff | 6 | static get HasEnpassant() { return false; } |
33ee1916 | 7 | |
92342261 | 8 | // TODO(?): some duplicated code in 2 next functions |
46302e64 | 9 | getSlideNJumpMoves([x,y], steps, oneStep) |
1d184b4c | 10 | { |
46302e64 | 11 | const color = this.getColor(x,y); |
1221ac47 | 12 | let moves = []; |
1d184b4c | 13 | outerLoop: |
1221ac47 | 14 | for (let loop=0; loop<steps.length; loop++) |
1d184b4c | 15 | { |
1221ac47 BA |
16 | const step = steps[loop]; |
17 | let i = x + step[0]; | |
18 | let j = y + step[1]; | |
0b7d99ec | 19 | while (V.OnBoard(i,j) && this.board[i][j] == V.EMPTY) |
1d184b4c | 20 | { |
46302e64 BA |
21 | moves.push(this.getBasicMove([x,y], [i,j])); |
22 | if (!!oneStep) | |
1d184b4c BA |
23 | continue outerLoop; |
24 | i += step[0]; | |
25 | j += step[1]; | |
26 | } | |
27 | // No capture check: handled elsewhere (next method) | |
28 | } | |
29 | return moves; | |
30 | } | |
31 | ||
32 | // follow steps from x,y until something is met. | |
33 | // if met piece is opponent and same movement (asA): eat it! | |
46302e64 | 34 | findCaptures_aux([x,y], asA) |
1d184b4c | 35 | { |
46302e64 | 36 | const color = this.getColor(x,y); |
1d184b4c | 37 | var moves = []; |
1221ac47 BA |
38 | const steps = asA != V.PAWN |
39 | ? (asA==V.QUEEN ? V.steps[V.ROOK].concat(V.steps[V.BISHOP]) : V.steps[asA]) | |
1d184b4c | 40 | : color=='w' ? [[-1,-1],[-1,1]] : [[1,-1],[1,1]]; |
1221ac47 | 41 | const oneStep = (asA==V.KNIGHT || asA==V.PAWN); //we don't capture king |
0b7d99ec | 42 | const lastRank = (color == 'w' ? 0 : V.size.x-1); |
1221ac47 | 43 | const promotionPieces = [V.ROOK,V.KNIGHT,V.BISHOP,V.QUEEN]; |
1d184b4c | 44 | outerLoop: |
1221ac47 | 45 | for (let loop=0; loop<steps.length; loop++) |
1d184b4c | 46 | { |
1221ac47 BA |
47 | const step = steps[loop]; |
48 | let i = x + step[0]; | |
49 | let j = y + step[1]; | |
0b7d99ec | 50 | while (V.OnBoard(i,j) && this.board[i][j] == V.EMPTY) |
1d184b4c BA |
51 | { |
52 | if (oneStep) | |
53 | continue outerLoop; | |
54 | i += step[0]; | |
55 | j += step[1]; | |
56 | } | |
26b8e4f7 | 57 | if (V.OnBoard(i,j) && this.getColor(i,j) == V.GetOppCol(color) |
0b7d99ec | 58 | && this.getPiece(i,j) == asA) |
1d184b4c BA |
59 | { |
60 | // eat! | |
61 | if (this.getPiece(x,y) == V.PAWN && i == lastRank) | |
62 | { | |
63 | // Special case of promotion: | |
64 | promotionPieces.forEach(p => { | |
46302e64 | 65 | moves.push(this.getBasicMove([x,y], [i,j], {c:color,p:p})); |
1d184b4c BA |
66 | }); |
67 | } | |
68 | else | |
69 | { | |
70 | // All other cases | |
46302e64 | 71 | moves.push(this.getBasicMove([x,y], [i,j])); |
1d184b4c BA |
72 | } |
73 | } | |
74 | } | |
75 | return moves; | |
76 | } | |
77 | ||
78 | // Find possible captures from a square: look in every direction! | |
46302e64 | 79 | findCaptures(sq) |
1d184b4c | 80 | { |
92342261 | 81 | let moves = []; |
1d184b4c | 82 | |
0b7d99ec BA |
83 | Array.prototype.push.apply(moves, this.findCaptures_aux(sq, V.PAWN)); |
84 | Array.prototype.push.apply(moves, this.findCaptures_aux(sq, V.ROOK)); | |
85 | Array.prototype.push.apply(moves, this.findCaptures_aux(sq, V.KNIGHT)); | |
86 | Array.prototype.push.apply(moves, this.findCaptures_aux(sq, V.BISHOP)); | |
87 | Array.prototype.push.apply(moves, this.findCaptures_aux(sq, V.QUEEN)); | |
1d184b4c BA |
88 | |
89 | return moves; | |
90 | } | |
91 | ||
46302e64 | 92 | getPotentialPawnMoves([x,y]) |
1d184b4c | 93 | { |
46302e64 | 94 | const color = this.getColor(x,y); |
0b7d99ec BA |
95 | let moves = []; |
96 | const [sizeX,sizeY] = [V.size.x,V.size.y]; | |
97 | const shift = (color == 'w' ? -1 : 1); | |
98 | const startRank = (color == 'w' ? sizeY-2 : 1); | |
99 | const firstRank = (color == 'w' ? sizeY-1 : 0); | |
100 | const lastRank = (color == "w" ? 0 : sizeY-1); | |
1d184b4c | 101 | |
69f3d801 | 102 | if (x+shift != lastRank) |
1d184b4c BA |
103 | { |
104 | // Normal moves | |
105 | if (this.board[x+shift][y] == V.EMPTY) | |
106 | { | |
46302e64 | 107 | moves.push(this.getBasicMove([x,y], [x+shift,y])); |
01ca2adc | 108 | if ([startRank,firstRank].includes(x) && this.board[x+2*shift][y] == V.EMPTY) |
1d184b4c BA |
109 | { |
110 | //two squares jump | |
46302e64 | 111 | moves.push(this.getBasicMove([x,y], [x+2*shift,y])); |
1d184b4c BA |
112 | } |
113 | } | |
114 | } | |
115 | ||
69f3d801 | 116 | else //promotion |
1d184b4c | 117 | { |
1d184b4c BA |
118 | let promotionPieces = [V.ROOK,V.KNIGHT,V.BISHOP,V.QUEEN]; |
119 | promotionPieces.forEach(p => { | |
120 | // Normal move | |
121 | if (this.board[x+shift][y] == V.EMPTY) | |
46302e64 | 122 | moves.push(this.getBasicMove([x,y], [x+shift,y], {c:color,p:p})); |
1d184b4c BA |
123 | }); |
124 | } | |
125 | ||
33ee1916 | 126 | // No en passant here |
1d184b4c BA |
127 | |
128 | // Add "zen" captures | |
46302e64 | 129 | Array.prototype.push.apply(moves, this.findCaptures([x,y])); |
1d184b4c BA |
130 | |
131 | return moves; | |
132 | } | |
133 | ||
46302e64 | 134 | getPotentialRookMoves(sq) |
1d184b4c | 135 | { |
0b7d99ec | 136 | let noCaptures = this.getSlideNJumpMoves(sq, V.steps[V.ROOK]); |
46302e64 | 137 | let captures = this.findCaptures(sq); |
1d184b4c BA |
138 | return noCaptures.concat(captures); |
139 | } | |
140 | ||
46302e64 | 141 | getPotentialKnightMoves(sq) |
1d184b4c | 142 | { |
0b7d99ec | 143 | let noCaptures = this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep"); |
46302e64 | 144 | let captures = this.findCaptures(sq); |
1d184b4c BA |
145 | return noCaptures.concat(captures); |
146 | } | |
147 | ||
46302e64 | 148 | getPotentialBishopMoves(sq) |
1d184b4c | 149 | { |
0b7d99ec | 150 | let noCaptures = this.getSlideNJumpMoves(sq, V.steps[V.BISHOP]); |
46302e64 | 151 | let captures = this.findCaptures(sq); |
1d184b4c BA |
152 | return noCaptures.concat(captures); |
153 | } | |
154 | ||
46302e64 | 155 | getPotentialQueenMoves(sq) |
1d184b4c | 156 | { |
92342261 BA |
157 | let noCaptures = this.getSlideNJumpMoves( |
158 | sq, V.steps[V.ROOK].concat(V.steps[V.BISHOP])); | |
46302e64 | 159 | let captures = this.findCaptures(sq); |
1d184b4c BA |
160 | return noCaptures.concat(captures); |
161 | } | |
162 | ||
46302e64 | 163 | getPotentialKingMoves(sq) |
1d184b4c BA |
164 | { |
165 | // Initialize with normal moves | |
a37076f1 BA |
166 | let noCaptures = this.getSlideNJumpMoves(sq, |
167 | V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep"); | |
46302e64 BA |
168 | let captures = this.findCaptures(sq); |
169 | return noCaptures.concat(captures).concat(this.getCastleMoves(sq)); | |
1d184b4c BA |
170 | } |
171 | ||
172 | getNotation(move) | |
173 | { | |
174 | // Recognize special moves first | |
175 | if (move.appear.length == 2) | |
176 | { | |
177 | // castle | |
178 | if (move.end.y < move.start.y) | |
179 | return "0-0-0"; | |
180 | else | |
181 | return "0-0"; | |
182 | } | |
183 | ||
184 | // Translate initial square (because pieces may fly unusually in this variant!) | |
2d7194bd | 185 | const initialSquare = V.CoordsToSquare(move.start); |
1d184b4c BA |
186 | |
187 | // Translate final square | |
2d7194bd | 188 | const finalSquare = V.CoordsToSquare(move.end); |
1d184b4c BA |
189 | |
190 | let notation = ""; | |
15c1295a | 191 | const piece = this.getPiece(move.start.x, move.start.y); |
0b7d99ec | 192 | if (piece == V.PAWN) |
1d184b4c BA |
193 | { |
194 | // pawn move (TODO: enPassant indication) | |
195 | if (move.vanish.length > 1) | |
196 | { | |
197 | // capture | |
198 | notation = initialSquare + "x" + finalSquare; | |
199 | } | |
200 | else //no capture | |
201 | notation = finalSquare; | |
202 | if (piece != move.appear[0].p) //promotion | |
203 | notation += "=" + move.appear[0].p.toUpperCase(); | |
204 | } | |
205 | ||
206 | else | |
207 | { | |
208 | // Piece movement | |
209 | notation = piece.toUpperCase(); | |
210 | if (move.vanish.length > 1) | |
211 | notation += initialSquare + "x"; | |
212 | notation += finalSquare; | |
213 | } | |
214 | return notation; | |
215 | } | |
216 | ||
2d7194bd BA |
217 | static get VALUES() |
218 | { | |
219 | // TODO: experimental | |
1d184b4c BA |
220 | return { |
221 | 'p': 1, | |
222 | 'r': 3, | |
223 | 'n': 2, | |
224 | 'b': 2, | |
225 | 'q': 5, | |
226 | 'k': 1000 | |
227 | } | |
228 | } | |
229 | } |