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Add support for eval command #42

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Merged
CorentinGS merged 1 commit into from
May 16, 2025
Merged

Add support for eval command #42

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24 changes: 24 additions & 0 deletions uci/cmd.go
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@ import (
"bufio"
"errors"
"fmt"
"math"
"strconv"
"strings"
"time"
Expand Down Expand Up @@ -118,6 +119,29 @@ var (
CmdQuit = cmdNoOptions{Name: "quit", F: func(_ *Engine) error {
return nil
}}

// CmdEval is a non-standard command that requests the engine's static evaluation of the current position.
CmdEval = cmdNoOptions{Name: "eval", F: func(e *Engine) error {
scanner := bufio.NewScanner(e.out)
for scanner.Scan() {
text := e.readLine(scanner)
if strings.Contains(text, "error") {
return errors.New("eval command not supported")
}
if strings.HasPrefix(text, "Final evaluation") {
parts := strings.Fields(text)
if len(parts) >= 3 {
evalStr := parts[2]
eval, err := strconv.ParseFloat(evalStr, 64)
if err == nil {
e.eval = int(math.Round(eval * 100))
}
break
}
}
}
return nil
}}
)

// CmdSetOption corresponds to the "setoption" command:
Expand Down
7 changes: 7 additions & 0 deletions uci/engine.go
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@ type Engine struct {
mu *sync.RWMutex
position *CmdPosition
results SearchResults
eval int
debug bool
}

Expand Down Expand Up @@ -124,6 +125,12 @@ func (e *Engine) SearchResults() SearchResults {
return e.results
}

func (e *Engine) Eval() int {
e.mu.RLock()
defer e.mu.RUnlock()
return e.eval
}

// Run runs the set of Cmds in the order given and returns an error if
// any of the commands fails. Except for CmdStop (usually paired with
// CmdGo's infinite option) all commands block via mutux until completed.
Expand Down
40 changes: 40 additions & 0 deletions uci/engine_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,46 @@ func isEngineAvailable(engine string) bool {
return err == nil
}

func Test_EngineEval(t *testing.T) {
for _, name := range engines {
fenStr := "4k3/8/8/8/8/8/8/4K2R w - - 0 1"

t.Run("EngineEval_"+name, func(t *testing.T) {
if !isEngineAvailable(name) {
t.Skipf("engine %s not available", name)
}

pos := &chess.Position{}
if err := pos.UnmarshalText([]byte(fenStr)); err != nil {
t.Fatal("failed to parse FEN", err)
}

eng, err := uci.New(name, uci.Debug)
if err != nil {
t.Fatal(err)
}
defer eng.Close()

cmdPos := uci.CmdPosition{Position: pos}
err = eng.Run(uci.CmdUCI, uci.CmdIsReady, uci.CmdUCINewGame, cmdPos, uci.CmdEval)

if name == "stockfish" {
if err != nil {
t.Fatal("failed to run command", err)
}

if eng.Eval() < 500 {
t.Errorf("expected an eval greater than or equal to 500, got %d", eng.Eval())
}
} else if name == "lc0" {
if err == nil {
t.Fatal("expected an error", err)
}
}
})
}
}

func Test_EngineInfo(t *testing.T) {
for _, name := range engines {
fenStr := "r1bq1rk1/ppp2ppp/2n2n2/3pp3/3P4/2P1PN2/PP1N1PPP/R1BQ1RK1 w - - 0 8"
Expand Down
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