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package redis
import (
"reflect"
"runtime"
)
// methodName returns the name of the calling method,
// assumed to be two stack frames above.
func methodName() string {
pc, _, _, _ := runtime.Caller(2)
f := runtime.FuncForPC(pc)
if f == nil {
return "unknown method"
}
return f.Name()
}
// mustBe panics if f's kind is not expected.
func mustBe(v reflect.Value, expected reflect.Kind) {
if v.Kind() != expected {
panic(&reflect.ValueError{Method: methodName(), Kind: v.Kind()})
}
}
// fieldByIndexCreate returns the nested field corresponding
// to index creating elements that are nil when stepping through.
// It panics if v is not a struct.
func fieldByIndexCreate(v reflect.Value, index []int) reflect.Value {
if len(index) == 1 {
return v.Field(index[0])
}
mustBe(v, reflect.Struct)
for i, x := range index {
if i > 0 {
if v.Kind() == reflect.Ptr && v.Type().Elem().Kind() == reflect.Struct {
if v.IsNil() {
v.Set(reflect.New(v.Type().Elem()))
}
v = v.Elem()
}
}
v = v.Field(x)
}
return v
}
|
