Chess960 support

README.md

@@ -5,7 +5,7 @@ PHP library for reading and editing FEN and PGN chess formats.
 
 ## Features
 ### FEN class
- - load FEN representing chess position
+ - load FEN representing chess position (standard or Shredder-FEN)
  - read and modify all FEN fields
  - export FEN
  - read and set piece placement
@@ -15,13 +15,15 @@ PHP library for reading and editing FEN and PGN chess formats.
  - perform move in given position
  - test if move is legal in given position
  - list all legal moves in given position
+ - supports Fisher's random (Chess960)
 
 ### PGN class
  - load PGN representing chess game
  - read and set all tag pairs (PGN headers)
  - export PGN
  - read and add moves
  - get FEN position after any move
+ - supports Fisher's random (Chess960)
 
 ## Installation
 Install with composer:
@@ -44,7 +46,7 @@ echo($fen->get_board());
 // rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR
 echo($fen->get_active_color());
 // w
-echo($fen->get_castling_string());
+echo($fen->get_castling());
 // KQkq
 echo($fen->get_en_passant());
 // -
@@ -76,7 +78,7 @@ echo($fen->get_board());
 // rnbqkbnr/pp1ppppp/8/2p5/4P3/8/PPPP1PPP/RNBQKBNR
 echo($fen->get_active_color());
 // b
-echo($fen->get_castling_string());
+echo($fen->get_castling());
 // KQq
 echo($fen->get_en_passant());
 // c6
@@ -124,7 +126,7 @@ echo($fen->export());
 // rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
 $fen->set_board('rnbqkbnr/pp1ppppp/8/2p5/4P3/8/PPPP1PPP/RNBQKBNR');
 $fen->set_active_color('b');
-$fen->set_castling_string('KQq');
+$fen->set_castling('KQq');
 $fen->set_en_passant('c6');
 $fen->set_halfmove(1);
 $fen->set_fullmove(2);
@@ -185,6 +187,7 @@ Test check, mate, stalemate:
 $fen = new Onspli\Chess\FEN;
 $fen->set_active_color('w');
 $fen->set_board('1q5k/8/8/8/8/8/8/K7');
+$fen->set_castling('-');
 echo($fen->is_check() ? 'true' : 'false');
 // false
 echo($fen->is_stalemate() ? 'true' : 'false');

README.template.md

@@ -5,7 +5,7 @@ PHP library for reading and editing FEN and PGN chess formats.
 
 ## Features
 ### FEN class
- - load FEN representing chess position
+ - load FEN representing chess position (standard or Shredder-FEN)
  - read and modify all FEN fields
  - export FEN
  - read and set piece placement
@@ -15,13 +15,15 @@ PHP library for reading and editing FEN and PGN chess formats.
  - perform move in given position
  - test if move is legal in given position
  - list all legal moves in given position
+ - supports Fisher's random (Chess960)
 
 ### PGN class
  - load PGN representing chess game
  - read and set all tag pairs (PGN headers)
  - export PGN
  - read and add moves
  - get FEN position after any move
+ - supports Fisher's random (Chess960)
 
 ## Installation
 Install with composer:
@@ -40,7 +42,7 @@ echo($fen->export());
 echo($fen->export_short());
 echo($fen->get_board());
 echo($fen->get_active_color());
-echo($fen->get_castling_string());
+echo($fen->get_castling());
 echo($fen->get_en_passant());
 echo($fen->get_halfmove());
 echo($fen->get_fullmove());
@@ -54,7 +56,7 @@ echo($fen->export());
 echo($fen->export_short());
 echo($fen->get_board());
 echo($fen->get_active_color());
-echo($fen->get_castling_string());
+echo($fen->get_castling());
 echo($fen->get_en_passant());
 echo($fen->get_halfmove());
 echo($fen->get_fullmove());
@@ -76,7 +78,7 @@ $fen = new Onspli\Chess\FEN;
 echo($fen->export());
 $fen->set_board('rnbqkbnr/pp1ppppp/8/2p5/4P3/8/PPPP1PPP/RNBQKBNR');
 $fen->set_active_color('b');
-$fen->set_castling_string('KQq');
+$fen->set_castling('KQq');
 $fen->set_en_passant('c6');
 $fen->set_halfmove(1);
 $fen->set_fullmove(2);
@@ -105,6 +107,7 @@ Test check, mate, stalemate:
 $fen = new Onspli\Chess\FEN;
 $fen->set_active_color('w');
 $fen->set_board('1q5k/8/8/8/8/8/8/K7');
+$fen->set_castling('-');
 echo($fen->is_check() ? 'true' : 'false');
 echo($fen->is_stalemate() ? 'true' : 'false');
 echo($fen->preview());

docs/README.md

@@ -15,14 +15,15 @@
 | [Board::get_defended_squares](#Boardget_defended_squares) | Get array of all squares defended (or attacked) by $defender being on $defender_square. |
 | [Board::get_reachable_squares](#Boardget_reachable_squares) | Get array of all squares reachable from $origin_square by $moving_piece. |
 | [Board::find_squares_with_piece](#Boardfind_squares_with_piece) | Returns array of squares containing piece. |
+| [Board::find_square_with_piece](#Boardfind_square_with_piece) | Returns square containing piece. If there are more pieces, throws. |
 | [Board::get_color_of_piece](#Boardget_color_of_piece) | Returns the color of the piece. |
 | [Board::get_piece_of_color](#Boardget_piece_of_color) | Converts piece to requested color. |
 | [Board::get_opposite_color](#Boardget_opposite_color) | Get color opposite to color passed as an argument. |
 | [Board::is_square_attacked_by_piece](#Boardis_square_attacked_by_piece) | Tells whether the square is attacked by particular piece |
 | [Board::is_square_attacked](#Boardis_square_attacked) | Tells whether the square is attacked by the color specified. |
 | [Board::is_check](#Boardis_check) | Tells whether the king of color specified is in check. |
 | [**FEN**](#FEN) | FEN is a standard notation for describing a particular board position of a chess game |
-| [FEN::__construct](#FEN__construct) | Load FEN or setup starting position. |
+| [FEN::__construct](#FEN__construct) | Load FEN (or Shredder-FEN) or setup starting position. |
 | [FEN::__clone](#FEN__clone) |  |
 | [FEN::export](#FENexport) | Export whole FEN string. |
 | [FEN::export_short](#FENexport_short) | Export FEN string without halfmoves count and fullmove number. |
@@ -34,10 +35,8 @@
 | [FEN::set_square](#FENset_square) | Set piece on a particular square. |
 | [FEN::get_active_color](#FENget_active_color) | Active color. |
 | [FEN::set_active_color](#FENset_active_color) | Set active color. |
-| [FEN::get_castling_string](#FENget_castling_string) | Castling availability. |
-| [FEN::set_castling_string](#FENset_castling_string) | Set castling availability. |
-| [FEN::get_castling_availability](#FENget_castling_availability) | Get castling availability of particular type. |
-| [FEN::set_castling_availability](#FENset_castling_availability) | Set castling availability of particular type. |
+| [FEN::get_castling](#FENget_castling) | Castling availability. |
+| [FEN::set_castling](#FENset_castling) | Set castling availability. |
 | [FEN::get_en_passant](#FENget_en_passant) | Get En Passant target square. |
 | [FEN::set_en_passant](#FENset_en_passant) | Set En Passant target square. |
 | [FEN::get_halfmove](#FENget_halfmove) | Get Halfmove clock |
@@ -367,6 +366,32 @@ Board::find_squares_with_piece( string piece, bool as_object = false ): array
 
 
 
+---
+### Board::find_square_with_piece
+
+Returns square containing piece. If there are more pieces, throws.
+
+```php
+Board::find_square_with_piece( string piece, bool as_object = false ): mixed
+```
+
+
+
+
+**Parameters:**
+
+| Parameter | Type | Description |
+|-----------|------|-------------|
+| `piece` | **string** |  |
+| `as_object` | **bool** |  |
+
+
+**Return Value:**
+
+
+
+
+
 ---
 ### Board::get_color_of_piece
 
@@ -539,7 +564,7 @@ move according to chess rules.
 
 ### FEN::__construct
 
-Load FEN or setup starting position.
+Load FEN (or Shredder-FEN) or setup starting position.
 
 ```php
 FEN::__construct( string fen = 'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1' ): void
@@ -818,19 +843,22 @@ FEN::set_active_color( string color ): void
 
 
 ---
-### FEN::get_castling_string
+### FEN::get_castling
 
 Castling availability.
 
 ```php
-FEN::get_castling_string(  ): string
+FEN::get_castling(  ): string
 ```
 
 If neither side can castle, this is "-".
 Otherwise, this has one or more letters: "K" (White can castle kingside),
 "Q" (White can castle queenside), "k" (Black can castle kingside), and/or
 "q" (Black can castle queenside). A move that temporarily prevents castling
 does not negate this notation.
+Shredder-FEN is also supported - instead of K and Q the letters
+of files containing rooks are used. For standard chess its AHah.
+X-FEN is not supported.
 
 
 
@@ -841,19 +869,22 @@ castling availability string
 
 
 ---
-### FEN::set_castling_string
+### FEN::set_castling
 
 Set castling availability.
 
 ```php
-FEN::set_castling_string( string castling ): void
+FEN::set_castling( string castling ): void
 ```
 
 If neither side can castle, this is "-".
 Otherwise, this has one or more letters: "K" (White can castle kingside),
 "Q" (White can castle queenside), "k" (Black can castle kingside), and/or
 "q" (Black can castle queenside). A move that temporarily prevents castling
 does not negate this notation.
+Shredder-FEN is also supported - instead of K and Q the letters
+of files containing rooks are used. For standard chess its AHah.
+X-FEN is not supported.
 
 
 **Parameters:**
@@ -869,63 +900,6 @@ does not negate this notation.
 
 
 
----
-### FEN::get_castling_availability
-
-Get castling availability of particular type.
-
-```php
-FEN::get_castling_availability( string type ): bool
-```
-
-Possible castling types: "K" (White can castle kingside),
-"Q" (White can castle queenside), "k" (Black can castle kingside), and/or
-"q" (Black can castle queenside). A move that temporarily prevents castling
-does not negate this notation.
-
-
-**Parameters:**
-
-| Parameter | Type | Description |
-|-----------|------|-------------|
-| `type` | **string** |  |
-
-
-**Return Value:**
-
-
-
-
-
----
-### FEN::set_castling_availability
-
-Set castling availability of particular type.
-
-```php
-FEN::set_castling_availability( string type, bool avalability ): void
-```
-
-Possible castling types: "K" (White can castle kingside),
-"Q" (White can castle queenside), "k" (Black can castle kingside), and/or
-"q" (Black can castle queenside). A move that temporarily prevents castling
-does not negate this notation.
-
-
-**Parameters:**
-
-| Parameter | Type | Description |
-|-----------|------|-------------|
-| `type` | **string** |  |
-| `avalability` | **bool** |  |
-
-
-**Return Value:**
-
-
-
-
-
 ---
 ### FEN::get_en_passant
 

src/Board.php

@@ -390,6 +390,18 @@ public function find_squares_with_piece(string $piece, bool $as_object = false)
     return $arr;
   }
 
+  /**
+  * Returns square containing piece. If there are more pieces, throws.
+  */
+  public function find_square_with_piece(string $piece, bool $as_object = false)
+  {
+    $squares = $this->find_squares_with_piece($piece, $as_object);
+    if (sizeof($squares) != 1) {
+      throw new RulesException("There are " . sizeof($squares) . " pieces '" . $piece . "' on the board.");
+    }
+    return $squares[0];
+  }
+
   /**
   * Returns the color of the piece.
   * @return string w|b
@@ -493,13 +505,8 @@ public function is_square_attacked($square, string $attacking_color) : bool
   public function is_check(string $color) : bool
   {
     self::validate_color($color);
-
-    $king_squares = $this->find_squares_with_piece(self::get_piece_of_color('K', $color), true);
-    if (sizeof($king_squares) != 1) {
-      throw new RulesException("There are " . sizeof($king_squares) . " kings of active color on the board.");
-    }
-
-    return $this->is_square_attacked($king_squares[0], self::get_opposite_color($color));
+    $king_square = $this->find_square_with_piece(self::get_piece_of_color('K', $color), true);
+    return $this->is_square_attacked($king_square, self::get_opposite_color($color));
   }
 
   private static function validate_color(string $color) : void