aicra/datatype/builtin/uint.go

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package builtin
import (
"encoding/json"
"math"
"reflect"
"git.xdrm.io/go/aicra/datatype"
)
// UintDataType is what its name tells
type UintDataType struct{}
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// Type returns the type of data
func (UintDataType) Type() reflect.Type {
return reflect.TypeOf(uint(0))
}
// Build returns the validator
func (UintDataType) Build(typeName string, registry ...datatype.T) datatype.Validator {
// nothing if type not handled
if typeName != "uint" {
return nil
}
return func(value interface{}) (interface{}, bool) {
switch cast := value.(type) {
case int:
return uint(cast), cast >= 0
case uint:
return cast, true
case float64:
uintVal := uint(cast)
overflows := cast < 0 || cast > math.MaxUint64
return uintVal, cast == float64(uintVal) && !overflows
// serialized string -> try to convert to float
case string:
num := json.Number(cast)
floatVal, err := num.Float64()
if err != nil {
return 0, false
}
overflows := floatVal < 0 || floatVal > math.MaxUint64
return uint(floatVal), !overflows
case []byte:
num := json.Number(cast)
floatVal, err := num.Float64()
if err != nil {
return 0, false
}
overflows := floatVal < 0 || floatVal > math.MaxUint64
return uint(floatVal), !overflows
// unknown type
default:
return 0, false
}
}
}