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value.go
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value.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
import (
"strconv"
"strings"
"github.com/frankkopp/FrankyGo/internal/util"
)
// Value represents the positional value of a chess position
type Value int16
// Constants for values
const (
ValueZero Value = 0
ValueDraw Value = 0
ValueOne Value = 1
ValueInf Value = 15_000
ValueNA = -ValueInf - 1
ValueMax Value = 10_000
ValueMin = -ValueMax
ValueCheckMate = ValueMax
ValueCheckMateThreshold = ValueCheckMate - MaxDepth - 1
)
// IsValid checks if value is within valid range (between Min and Max)
func (v Value) IsValid() bool {
return v >= ValueMin && v <= ValueMax
}
// IsCheckMateValue returns true if value is above the check mate threshold
// which typically is set to check mate value minus the maximum search depth
func (v Value) IsCheckMateValue() bool {
return util.Abs(int(v)) > int(ValueCheckMateThreshold) && util.Abs(int(v)) <= int(ValueCheckMate)
}
// Min returns the smaller of the given values
func Min(x, y Value) Value {
if x < y {
return x
}
return y
}
// Max returns the bigger of the given values
func Max(x, y Value) Value {
if x > y {
return x
}
return y
}
func (v Value) String() string {
var os strings.Builder
if v.IsCheckMateValue() {
os.WriteString("mate ")
if v < ValueZero {
os.WriteString("-")
}
i := int(ValueCheckMate) - util.Abs(int(v))
i2 := (i + 1) / 2
os.WriteString(strconv.Itoa(i2))
} else if v == ValueNA {
os.WriteString("N/A")
} else {
os.WriteString("cp ")
os.WriteString(strconv.Itoa(int(v)))
}
return os.String()
}