/
piecetype.go
91 lines (79 loc) · 3.1 KB
/
piecetype.go
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//
// FrankyGo - UCI chess engine in GO for learning purposes
//
// MIT License
//
// Copyright (c) 2018-2020 Frank Kopp
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
package types
// PieceType is a set of constants for piece types in chess
type PieceType int8
// PieceType is a set of constants for piece types in chess
// test for non sliding pt & 0b0100 == 0 (must be none zero)
// test for sliding pt & 0b0100 == 1 (must be < 7)
// PtNone = 0b0000
// King = 0b0001 // non sliding
// Pawn = 0b0010 // non sliding
// Knight = 0b0011 // non sliding
// Bishop = 0b0100 // sliding
// Rook = 0b0101 // sliding
// Queen = 0b0110 // sliding
// PtLength = 0b0111
const (
PtNone PieceType = 0b0000
King PieceType = 0b0001
Pawn PieceType = 0b0010
Knight PieceType = 0b0011
Bishop PieceType = 0b0100
Rook PieceType = 0b0101
Queen PieceType = 0b0110
PtLength PieceType = 0b0111
)
// array of string labels for piece types
var pieceTypeToString = [PtLength]string{"NOPIECE", "King", "Pawn", "Knight", "Bishop", "Rook", "Queen"}
// String returns a string representation of a piece type
func (pt PieceType) String() string {
return pieceTypeToString[pt]
}
// array of string labels for piece types
var pieceTypeToChar = string("-KPNBRQ")
// Char returns a single char string representation of a piece type
func (pt PieceType) Char() string {
return string(pieceTypeToChar[pt])
}
// array of string labels for piece types
var gamePhaseValue = [PtLength]int{0, 0, 0, 1, 1, 2, 4}
// GamePhaseValue returns a value for calculating game phase
// by adding the number of certain piece type times this value
func (pt PieceType) GamePhaseValue() int {
return gamePhaseValue[pt]
}
// array of string labels for piece types
var pieceTypeValue = [PtLength]Value{0, 2000, 100, 320, 330, 500, 900}
// ValueOf returns a value for calculating game phase
// by adding the number of certain piece type times this value
func (pt PieceType) ValueOf() Value {
return pieceTypeValue[pt]
}
// IsValid check if pt is a valid piece type
func (pt PieceType) IsValid() bool {
return pt > 0 && pt < 7
}