func ExampleWithEnvironment() {
env := makeEnv() // Create evaluation environment
result, panik, compileErrs := eval.EvalEnv(`fmt.Sprintf("%s %d", constant1, add(var1, 1) + 1)`, env)
_ = panik
_ = compileErrs
fmt.Printf("%+v\n", result[0].Interface())
}
// goEval runs eval.EvalEnv in a new goroutine. This is a quick hack to
// keep the debugger from pausing while running eval.EvalEnv.
func goEval(expr string, env eval.Env) (result []reflect.Value, panik error, compileErrors []error) {
c := make(chan struct{})
go func() {
defer close(c)
result, panik, compileErrors = eval.EvalEnv(expr, env)
}()
<-c
return
}
// goEval runs eval.EvalEnv in a new goroutine. This is a quick hack to
// keep the debugger from pausing while running eval.EvalEnv.
// It is also used to recover from panics in the eval library.
func goEval(expr string, env eval.Env) (result []reflect.Value, panik error, compileErrors []error) {
c := make(chan struct{})
go func() {
defer func() {
if r := recover(); r != nil {
panik = fmt.Errorf("%v", r)
}
close(c)
}()
result, panik, compileErrors = eval.EvalEnv(expr, env)
}()
<-c
return
}