[try] new package for handle error

result/try/try.go

@@ -0,0 +1,64 @@
+package try
+
+import (
+	"runtime"
+	"strconv"
+)
+
+// Error represents an error that occurred during a Try operation.
+type Error struct {
+	cause error
+	frame runtime.Frame
+}
+
+func (e *Error) Error() string {
+	return e.frame.File + ":" + strconv.Itoa(e.frame.Line) + ": " + e.cause.Error()
+}
+
+// Frame returns the frame of the caller of the function that called Try.
+func (e *Error) Frame() runtime.Frame { return e.frame }
+
+func (e *Error) Unwrap() error { return e.cause }
+
+func raise(e error) {
+	pcs := [1]uintptr{}
+	runtime.Callers(3, pcs[:])
+	frame, _ := runtime.CallersFrames(pcs[:]).Next()
+	panic(&Error{cause: e, frame: frame})
+}
+
+func Try(err error) {
+	if err != nil {
+		raise(err)
+	}
+}
+
+func Try1[A any](a A, err error) A {
+	if err != nil {
+		raise(err)
+	}
+	return a
+}
+
+func Catch(errRef *error) {
+	if err := recover(); err != nil {
+		switch err := err.(type) {
+		case *Error:
+			*errRef = err.cause
+		case error:
+			*errRef = err
+		default:
+			panic(err)
+		}
+	}
+}
+
+func CatchFunc(fn func(e *Error)) {
+	if err := recover(); err != nil {
+		if e, ok := err.(*Error); ok {
+			fn(e)
+		} else {
+			panic(err)
+		}
+	}
+}

result/try/try_test.go

@@ -0,0 +1,30 @@
+package try_test
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/frankban/quicktest"
+	"github.com/go-board/std/result/try"
+)
+
+func TestTry(t *testing.T) {
+	a := quicktest.New(t)
+	a.Run("Error", func(c *quicktest.C) {
+		defer try.CatchFunc(func(e *try.Error) {
+			c.Assert(e.Unwrap().Error(), quicktest.Equals, "error")
+		})
+		try.Try(errors.New("error"))
+	})
+	a.Run("NonError", func(*quicktest.C) {
+		try.Try(nil)
+	})
+}
+
+func TestTryReturn(t *testing.T) {
+	a := quicktest.New(t)
+	a.Run("Return", func(c *quicktest.C) {
+		x := try.Try1(100, nil)
+		c.Assert(x, quicktest.Equals, 100)
+	})
+}