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1d184b4c BA |
1 | class ZenRules extends ChessRules |
2 | { | |
33ee1916 BA |
3 | // NOTE: enPassant, if enabled, would need to redefine carefully getEpSquare |
4 | getEpSquare(move) | |
5 | { | |
6 | return undefined; | |
7 | } | |
8 | ||
92342261 | 9 | // TODO(?): some duplicated code in 2 next functions |
46302e64 | 10 | getSlideNJumpMoves([x,y], steps, oneStep) |
1d184b4c | 11 | { |
46302e64 | 12 | const color = this.getColor(x,y); |
1221ac47 BA |
13 | let moves = []; |
14 | const [sizeX,sizeY] = VariantRules.size; | |
1d184b4c | 15 | outerLoop: |
1221ac47 | 16 | for (let loop=0; loop<steps.length; loop++) |
1d184b4c | 17 | { |
1221ac47 BA |
18 | const step = steps[loop]; |
19 | let i = x + step[0]; | |
20 | let j = y + step[1]; | |
1d184b4c BA |
21 | while (i>=0 && i<sizeX && j>=0 && j<sizeY |
22 | && this.board[i][j] == VariantRules.EMPTY) | |
23 | { | |
46302e64 BA |
24 | moves.push(this.getBasicMove([x,y], [i,j])); |
25 | if (!!oneStep) | |
1d184b4c BA |
26 | continue outerLoop; |
27 | i += step[0]; | |
28 | j += step[1]; | |
29 | } | |
30 | // No capture check: handled elsewhere (next method) | |
31 | } | |
32 | return moves; | |
33 | } | |
34 | ||
35 | // follow steps from x,y until something is met. | |
36 | // if met piece is opponent and same movement (asA): eat it! | |
46302e64 | 37 | findCaptures_aux([x,y], asA) |
1d184b4c | 38 | { |
46302e64 | 39 | const color = this.getColor(x,y); |
1d184b4c | 40 | var moves = []; |
1221ac47 BA |
41 | const V = VariantRules; |
42 | const steps = asA != V.PAWN | |
43 | ? (asA==V.QUEEN ? V.steps[V.ROOK].concat(V.steps[V.BISHOP]) : V.steps[asA]) | |
1d184b4c | 44 | : color=='w' ? [[-1,-1],[-1,1]] : [[1,-1],[1,1]]; |
1221ac47 BA |
45 | const oneStep = (asA==V.KNIGHT || asA==V.PAWN); //we don't capture king |
46 | const [sizeX,sizeY] = V.size; | |
47 | const lastRank = (color == 'w' ? 0 : sizeY-1); | |
48 | const promotionPieces = [V.ROOK,V.KNIGHT,V.BISHOP,V.QUEEN]; | |
1d184b4c | 49 | outerLoop: |
1221ac47 | 50 | for (let loop=0; loop<steps.length; loop++) |
1d184b4c | 51 | { |
1221ac47 BA |
52 | const step = steps[loop]; |
53 | let i = x + step[0]; | |
54 | let j = y + step[1]; | |
55 | while (i>=0 && i<sizeX && j>=0 && j<sizeY && this.board[i][j] == V.EMPTY) | |
1d184b4c BA |
56 | { |
57 | if (oneStep) | |
58 | continue outerLoop; | |
59 | i += step[0]; | |
60 | j += step[1]; | |
61 | } | |
62 | if (i>=0 && i<sizeX && j>=0 && j<sizeY && | |
63 | this.getColor(i,j) == this.getOppCol(color) && this.getPiece(i,j) == asA) | |
64 | { | |
65 | // eat! | |
66 | if (this.getPiece(x,y) == V.PAWN && i == lastRank) | |
67 | { | |
68 | // Special case of promotion: | |
69 | promotionPieces.forEach(p => { | |
46302e64 | 70 | moves.push(this.getBasicMove([x,y], [i,j], {c:color,p:p})); |
1d184b4c BA |
71 | }); |
72 | } | |
73 | else | |
74 | { | |
75 | // All other cases | |
46302e64 | 76 | moves.push(this.getBasicMove([x,y], [i,j])); |
1d184b4c BA |
77 | } |
78 | } | |
79 | } | |
80 | return moves; | |
81 | } | |
82 | ||
83 | // Find possible captures from a square: look in every direction! | |
46302e64 | 84 | findCaptures(sq) |
1d184b4c | 85 | { |
92342261 | 86 | let moves = []; |
1d184b4c | 87 | |
46302e64 | 88 | Array.prototype.push.apply(moves, this.findCaptures_aux(sq, VariantRules.PAWN)); |
46302e64 | 89 | Array.prototype.push.apply(moves, this.findCaptures_aux(sq, VariantRules.ROOK)); |
46302e64 | 90 | Array.prototype.push.apply(moves, this.findCaptures_aux(sq, VariantRules.KNIGHT)); |
46302e64 | 91 | Array.prototype.push.apply(moves, this.findCaptures_aux(sq, VariantRules.BISHOP)); |
46302e64 | 92 | Array.prototype.push.apply(moves, this.findCaptures_aux(sq, VariantRules.QUEEN)); |
1d184b4c BA |
93 | |
94 | return moves; | |
95 | } | |
96 | ||
46302e64 | 97 | getPotentialPawnMoves([x,y]) |
1d184b4c | 98 | { |
46302e64 | 99 | const color = this.getColor(x,y); |
1d184b4c BA |
100 | var moves = []; |
101 | var V = VariantRules; | |
102 | let [sizeX,sizeY] = VariantRules.size; | |
103 | let shift = (color == 'w' ? -1 : 1); | |
104 | let startRank = (color == 'w' ? sizeY-2 : 1); | |
01ca2adc | 105 | let firstRank = (color == 'w' ? sizeY-1 : 0); |
1d184b4c BA |
106 | let lastRank = (color == "w" ? 0 : sizeY-1); |
107 | ||
108 | if (x+shift >= 0 && x+shift < sizeX && x+shift != lastRank) | |
109 | { | |
110 | // Normal moves | |
111 | if (this.board[x+shift][y] == V.EMPTY) | |
112 | { | |
46302e64 | 113 | moves.push(this.getBasicMove([x,y], [x+shift,y])); |
01ca2adc | 114 | if ([startRank,firstRank].includes(x) && this.board[x+2*shift][y] == V.EMPTY) |
1d184b4c BA |
115 | { |
116 | //two squares jump | |
46302e64 | 117 | moves.push(this.getBasicMove([x,y], [x+2*shift,y])); |
1d184b4c BA |
118 | } |
119 | } | |
120 | } | |
121 | ||
122 | if (x+shift == lastRank) | |
123 | { | |
124 | // Promotion | |
125 | let promotionPieces = [V.ROOK,V.KNIGHT,V.BISHOP,V.QUEEN]; | |
126 | promotionPieces.forEach(p => { | |
127 | // Normal move | |
128 | if (this.board[x+shift][y] == V.EMPTY) | |
46302e64 | 129 | moves.push(this.getBasicMove([x,y], [x+shift,y], {c:color,p:p})); |
1d184b4c BA |
130 | }); |
131 | } | |
132 | ||
33ee1916 | 133 | // No en passant here |
1d184b4c BA |
134 | |
135 | // Add "zen" captures | |
46302e64 | 136 | Array.prototype.push.apply(moves, this.findCaptures([x,y])); |
1d184b4c BA |
137 | |
138 | return moves; | |
139 | } | |
140 | ||
46302e64 | 141 | getPotentialRookMoves(sq) |
1d184b4c | 142 | { |
92342261 BA |
143 | let noCaptures = this.getSlideNJumpMoves( |
144 | sq, VariantRules.steps[VariantRules.ROOK]); | |
46302e64 | 145 | let captures = this.findCaptures(sq); |
1d184b4c BA |
146 | return noCaptures.concat(captures); |
147 | } | |
148 | ||
46302e64 | 149 | getPotentialKnightMoves(sq) |
1d184b4c | 150 | { |
92342261 BA |
151 | let noCaptures = this.getSlideNJumpMoves( |
152 | sq, VariantRules.steps[VariantRules.KNIGHT], "oneStep"); | |
46302e64 | 153 | let captures = this.findCaptures(sq); |
1d184b4c BA |
154 | return noCaptures.concat(captures); |
155 | } | |
156 | ||
46302e64 | 157 | getPotentialBishopMoves(sq) |
1d184b4c | 158 | { |
92342261 BA |
159 | let noCaptures = this.getSlideNJumpMoves( |
160 | sq, VariantRules.steps[VariantRules.BISHOP]); | |
46302e64 | 161 | let captures = this.findCaptures(sq); |
1d184b4c BA |
162 | return noCaptures.concat(captures); |
163 | } | |
164 | ||
46302e64 | 165 | getPotentialQueenMoves(sq) |
1d184b4c | 166 | { |
a37076f1 | 167 | const V = VariantRules; |
92342261 BA |
168 | let noCaptures = this.getSlideNJumpMoves( |
169 | sq, V.steps[V.ROOK].concat(V.steps[V.BISHOP])); | |
46302e64 | 170 | let captures = this.findCaptures(sq); |
1d184b4c BA |
171 | return noCaptures.concat(captures); |
172 | } | |
173 | ||
46302e64 | 174 | getPotentialKingMoves(sq) |
1d184b4c | 175 | { |
a37076f1 | 176 | const V = VariantRules; |
1d184b4c | 177 | // Initialize with normal moves |
a37076f1 BA |
178 | let noCaptures = this.getSlideNJumpMoves(sq, |
179 | V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep"); | |
46302e64 BA |
180 | let captures = this.findCaptures(sq); |
181 | return noCaptures.concat(captures).concat(this.getCastleMoves(sq)); | |
1d184b4c BA |
182 | } |
183 | ||
184 | getNotation(move) | |
185 | { | |
186 | // Recognize special moves first | |
187 | if (move.appear.length == 2) | |
188 | { | |
189 | // castle | |
190 | if (move.end.y < move.start.y) | |
191 | return "0-0-0"; | |
192 | else | |
193 | return "0-0"; | |
194 | } | |
195 | ||
196 | // Translate initial square (because pieces may fly unusually in this variant!) | |
197 | let initialSquare = | |
198 | String.fromCharCode(97 + move.start.y) + (VariantRules.size[0]-move.start.x); | |
199 | ||
200 | // Translate final square | |
201 | let finalSquare = | |
202 | String.fromCharCode(97 + move.end.y) + (VariantRules.size[0]-move.end.x); | |
203 | ||
204 | let notation = ""; | |
52b1e238 | 205 | let piece = this.getPiece(move.start.x, move.start.y); |
1d184b4c BA |
206 | if (piece == VariantRules.PAWN) |
207 | { | |
208 | // pawn move (TODO: enPassant indication) | |
209 | if (move.vanish.length > 1) | |
210 | { | |
211 | // capture | |
212 | notation = initialSquare + "x" + finalSquare; | |
213 | } | |
214 | else //no capture | |
215 | notation = finalSquare; | |
216 | if (piece != move.appear[0].p) //promotion | |
217 | notation += "=" + move.appear[0].p.toUpperCase(); | |
218 | } | |
219 | ||
220 | else | |
221 | { | |
222 | // Piece movement | |
223 | notation = piece.toUpperCase(); | |
224 | if (move.vanish.length > 1) | |
225 | notation += initialSquare + "x"; | |
226 | notation += finalSquare; | |
227 | } | |
228 | return notation; | |
229 | } | |
230 | ||
231 | static get VALUES() { //TODO: experimental | |
232 | return { | |
233 | 'p': 1, | |
234 | 'r': 3, | |
235 | 'n': 2, | |
236 | 'b': 2, | |
237 | 'q': 5, | |
238 | 'k': 1000 | |
239 | } | |
240 | } | |
241 | } |