chessai

commit 1cfae43b75fe87d4453ba39f37b6795e270017e9
parent e4df84ff35d8e790dfc16a9543f33f76bcda6cbf
Author: Jul <jul@9o.is>
Date:   Sat,  1 Dec 2012 16:41:14 -0500

Implemented legalSkip test in ChessRules.

Diffstat:
M
src/chess/ChessRules.java
 | 
52
++++++++++++++++++++++++++++++++++++++++++++++++----

1 file changed, 48 insertions(+), 4 deletions(-)
diff --git a/src/chess/ChessRules.java b/src/chess/ChessRules.java
@@ -1,6 +1,7 @@
 package chess;
 
 import chess.piece.ChessPiece;
+import chess.piece.ChessType;
 
 /**
  * Check
@@ -52,7 +53,7 @@ public class ChessRules {
         this.src = src;
         this.dest = dest;
 
-        return srcHasPiece() && uninhabitedSpace();
+        return srcHasPiece() && uninhabitedSpace() && legalSkip();
     }
 
     /*
@@ -61,7 +62,7 @@ public class ChessRules {
     private boolean srcHasPiece() {
         final ChessPiece srcPiece = ChessPiece.find(state.get(src));
         if(srcPiece == ChessPiece.NA) {
-            System.err.println(failurePrefix+"Empty test");
+            System.err.println(failurePrefix+"srcHasPiece test");
             return false;
         } else
             return true;
@@ -76,11 +77,54 @@ public class ChessRules {
 
         // are the source and destination pieces same color?
         if(srcPiece.getColor() == destPiece.getColor()) {
-            System.err.println(failurePrefix+"Uninhabited Space");
+            System.err.println(failurePrefix+"uninhabitedSpace test");
             return false;
         } else
             return true;
     }
 
-    //private boolean
+    /*
+     * Checks if source piece skips over other pieces when moving.
+     */
+    private boolean legalSkip() {
+        final ChessPiece srcPiece = ChessPiece.find(state.get(src));
+
+        // Knight is an exception.
+        if(srcPiece.getType() == ChessType.KNIGHT)
+            return true;
+
+        final int hor = dest.getFile() - src.getFile();
+        final int ver = dest.getRank() - src.getRank();
+
+        int rank = dest.getRank();
+        int file = dest.getFile();
+        while (src.getFile() != file || src.getRank() != rank) {
+            try {
+                final byte pieceValue =
+                        state.get(new ChessCoordinate((char)file, rank));
+                ChessPiece check = ChessPiece.find(pieceValue);
+
+                if(check != ChessPiece.NA) {
+                    System.err.println(failurePrefix+"legalSkip test");
+                    return false;
+                }
+
+            } catch (Exception e) {
+                System.err.println(failurePrefix+
+                        "Legal Skip method generated illegal chess"+
+                        " coordinate. This should not happen. Weird");
+                e.printStackTrace();
+            }
+
+            if(hor != 0) {
+                if(hor > 0) file--;
+                else file++;
+            }
+            if(ver != 0) {
+                if(ver > 0) rank--;
+                else rank++;
+            }
+        }
+        return true;
+    }
 }