src/board.cpp

   1 /* Copyright (C) 2007-2012 Vincent Ollivier
   2  *
   3  * Purple Haze is free software: you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation, either version 3 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * Purple Haze is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 #include <cassert>
  18 #include <iomanip>
  19 #include <iostream>
  20 #include <sstream>
  21
  22 #include "board.h"
  23
  24 Board::Board() : board(), dir_array()
  25 {
  26
  27     // Initialize attack and direction arrays
  28     for (const Square &from : SQUARES) {
  29         if (from == OUT) {
  30             break;
  31         }
  32         for (const Square &to : SQUARES) {
  33             if (to == OUT) {
  34                 break;
  35             }
  36             int diff = 0x77 + from - to;
  37             for (const PieceType& t : NOT_PAWN_TYPES) {
  38                 for (const Direction &d : PIECES_DIRS[t]) {
  39                     if (d == NO_DIR) {
  40                         break;
  41                     }
  42                     Square s = static_cast<Square>(from + d);
  43                     while (!is_out(s)) {
  44                         if (s == to) {
  45                             attack_array[diff][t] = true;
  46                             dir_array[diff] = d;
  47                             break;
  48                         }
  49                         switch (t) {
  50                         case KNIGHT:
  51                         case KING:
  52                             s = OUT;
  53                             break;
  54                         default:
  55                             s = static_cast<Square>(s + d);
  56                             break;
  57                         }
  58                     }
  59                 }
  60             }
  61         }
  62     }
  63 }
  64
  65 /*
  66  * Generate a string for pretty printing the content of a 0x88 string array.
  67  * This could be the board but also any PST array.
  68  */
  69 std::string Board::to_string(const std::string squares[], const int sq_width)
  70 {
  71     std::ostringstream stream;
  72     stream << std::endl;
  73     for (Square s = A8; s < OUT; s = Square(s + 1)) {
  74         if (is_out(s)) {
  75             continue;
  76         }
  77         if (file(s) == FILE_A) {
  78             stream << "     +";
  79             for (int i = 0; i < 8; ++i) {
  80                 // Every string representing a square
  81                 // should have the same size.
  82                 assert(sq_width > 0);
  83                 assert(squares[s].size() ==
  84                        static_cast<unsigned int>(sq_width));
  85                 for (int j = 0; j < sq_width; ++j) {
  86                     stream << "-";
  87                 }
  88                 stream << "+";
  89             }
  90             stream << std::endl;
  91             stream << "   " << rank(s) + 1 << " ";
  92         }
  93         stream << "|";
  94         stream << squares[s];
  95         if (file(s) == FILE_H) {
  96             stream << "|" << std::endl;
  97             if (s == H1) {
  98                 break; // The loop ends here
  99             }
 100             s = Square(s - 0x18);
 101         }
 102     }
 103
 104     // Bottom's border of the array
 105     stream << "     +";
 106     for (int i = 0; i < 8; ++i) {
 107         for (int j = 0; j < sq_width; ++j) {
 108             stream << "-";
 109         }
 110         stream << "+";
 111     }
 112     stream << std::endl << "     ";
 113
 114     // Output files names
 115     for (char c = 'a'; c <= 'h'; ++c) {
 116         int l = sq_width / 2;
 117         int r = sq_width % 2;
 118         stream << std::setw(l + 2) << c << std::setw(r) << " ";
 119     }
 120     stream << std::endl;
 121     return stream.str();
 122 }
 123
 124 /*
 125  * Pretty print the board
 126  */
 127 std::ostream& operator<<(std::ostream& out, const Board board)
 128 {
 129     std::string squares[BOARD_SIZE];
 130     for (int i = 0; i < BOARD_SIZE; ++i) {
 131         Square s = Square(i);
 132         squares[i] = " ";
 133         if (!board.is_empty(s)) {
 134             squares[i] += board[s].to_string();
 135         } else if (board.is_dark(s)) {
 136             squares[i] += ".";
 137         } else {
 138             squares[i] += " ";
 139         }
 140         squares[i] += " ";
 141     }
 142     out << board.to_string(squares, 3);
 143     return out;
 144 }