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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| package errors | ||
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| import "reflect" | ||
|
|
||
| // As finds the first error in `err`'s chain that matches target, and if so, sets | ||
| // target to that error value and returns true. | ||
| // | ||
| // The chain consists of err itself followed by the sequence of errors obtained by | ||
| // repeatedly calling Unwrap. | ||
| // | ||
| // An error matches target if the error's concrete value is assignable to the value | ||
| // pointed to by target, or if the error has a method As(interface{}) bool such that | ||
| // As(target) returns true. In the latter case, the As method is responsible for | ||
| // setting target. | ||
| // | ||
| // As will panic if target is not a non-nil pointer to either a type that implements | ||
| // error, or to any interface type. As returns false if err is nil. | ||
| func As(err error, target interface{}) bool { | ||
| if target == nil { | ||
| panic("errors: target cannot be nil") | ||
| } | ||
| val := reflect.ValueOf(target) | ||
| typ := val.Type() | ||
| if typ.Kind() != reflect.Ptr || val.IsNil() { | ||
| panic("errors: target must be a non-nil pointer") | ||
| } | ||
| if e := typ.Elem(); e.Kind() != reflect.Interface && !e.Implements(errorType) { | ||
| panic("errors: *target must be interface or implement error") | ||
| } | ||
| targetType := typ.Elem() | ||
| for err != nil { | ||
| if reflect.TypeOf(err).AssignableTo(targetType) { | ||
| val.Elem().Set(reflect.ValueOf(err)) | ||
| return true | ||
| } | ||
| if x, ok := err.(interface{ As(interface{}) bool }); ok && x.As(target) { | ||
| return true | ||
| } | ||
| err = Unwrap(err) | ||
| } | ||
| return false | ||
| } | ||
|
|
||
| // AsSlice tests err.As for errs slice | ||
| func AsSlice(errs []error, target interface{}) bool { | ||
| if target == nil { | ||
| panic("errors: target cannot be nil") | ||
| } | ||
| val := reflect.ValueOf(target) | ||
| typ := val.Type() | ||
| if typ.Kind() != reflect.Ptr || val.IsNil() { | ||
| panic("errors: target must be a non-nil pointer") | ||
| } | ||
| if e := typ.Elem(); e.Kind() != reflect.Interface && !e.Implements(errorType) { | ||
| panic("errors: *target must be interface or implement error") | ||
| } | ||
| targetType := typ.Elem() | ||
| for _, err := range errs { | ||
| if reflect.TypeOf(err).AssignableTo(targetType) { | ||
| val.Elem().Set(reflect.ValueOf(err)) | ||
| return true | ||
| } | ||
| if x, ok := err.(interface{ As(interface{}) bool }); ok && x.As(target) { | ||
| return true | ||
| } | ||
| err = Unwrap(err) | ||
| } | ||
| return false | ||
| } | ||
|
|
||
| var errorType = reflect.TypeOf((*error)(nil)).Elem() |
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