FEN: more work on FEN decoding, handling field 2 and 3

Board.cpp

@@ -89,22 +89,17 @@ void Board::setupInitialPosition() {
     return;
 }
 
-int setupFromFEN(std::string strFEN) {
+int Board::setupFromFEN(std::string strFEN) {
     std::vector<std::string> splitFEN = split(strFEN, ' ');
     if(splitFEN.size() != 6) // a valid FEN *must* contain 6 fields
         return -1;
+    // ====== START OF FIELD 1 ======
     std::vector<std::string> splitField1 = split(splitFEN[0], '/');
     int rank = 0, file = 0;
     int skip = 0;
     bool wKingPlaced = false, bKingPlaced = false;
     for(auto &ranks : splitField1) {
         for(auto &sym : ranks) {
-            if(skip) {
-                boardGrid[rank][file] = nullptr; // remove reference
-                skip--;
-                file++;
-                continue;
-            }
             switch(sym) {
                 case 'R':
                     // white rook
@@ -173,17 +168,62 @@ int setupFromFEN(std::string strFEN) {
                 case '5':
                 case '6':
                 case '7':
-                case '8':
+                case '8': {
-                case '9':
+                    std::string skipStr(1, sym);
-                    skip = atoi(sym);
+                    skip = atoi(skipStr.c_str());
+                    skip--; // fix off by 1 error
+                    do {
+                        boardGrid[rank][file] = nullptr; // remove reference
+                        file = (file < 8) ? file + 1 : 0;
+                    } while(--skip);
                     break;
+                }
                 default:
                     // invalid character?
                     return -1;
+                    break;
             }
             file++;
+            if(file > 7) {
+                file = 0;
+                break;
+            }
         }
         rank++;
+        if(rank > 7)
+            break;
+    }
+    // ======= END OF FIELD 1 ======
+    // ======= START OF FIELD 2 ======
+    std::string w = "w";
+    std::string b = "b";
+    if(splitFEN[1] == w)
+        playerTurn = PL_WHITE;
+    else if(splitFEN[1] == b)
+        playerTurn = PL_BLACK;
+    else {
+        // invalid FEN
+        return -1;
+    }
+    // ====== END OF FIELD 2 ======
+    // ====== START OF FIELD 3 ======
+    std::string k = "k", K = "K", q = "q", Q = "Q";
+    if(splitFEN[2] == "-") {
+        // nobody can castle, either side
+        // locate Kings and set appropriate variables
+        // canCastleKS, canCastleQS
+    }
+    if(splitFEN[2].find(k) != std::string::npos) {
+        // black king can castle kingside
+    }
+    if(splitFEN[2].find(K) != std::string::npos) {
+        // white king can castle kingside
+    }
+    if(splitFEN[2].find(q) != std::string::npos) {
+        // black king can castle queenside
+    }
+    if(splitFEN[2].find(Q) != std::string::npos) {
+        // white king can castle queenside
     }
     return 0;
 }
@@ -199,3 +239,7 @@ void Board::deserializeBoard(uint64_t incomingBoard) {
     // how do we then figure out what has moved?
     return;
 }
+
+std::unique_ptr<Piece> &Board::getPieceAt(Square square) {
+    return boardGrid[square.rank][square.file];
+}