59 lines
1.2 KiB
Go
59 lines
1.2 KiB
Go
package builtin
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import (
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"encoding/json"
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"math"
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"reflect"
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"git.xdrm.io/go/aicra/datatype"
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)
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// IntDataType is what its name tells
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type IntDataType struct{}
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// Type returns the type of data
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func (IntDataType) Type() reflect.Type {
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return reflect.TypeOf(int(0))
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}
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// Build returns the validator
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func (IntDataType) Build(typeName string, registry ...datatype.T) datatype.Validator {
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// nothing if type not handled
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if typeName != "int" {
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return nil
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}
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return func(value interface{}) (interface{}, bool) {
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switch cast := value.(type) {
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case int:
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return cast, true
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case uint:
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overflows := cast > math.MaxInt64
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return int(cast), !overflows
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case float64:
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intVal := int(cast)
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overflows := cast < float64(math.MinInt64) || cast > float64(math.MaxInt64)
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return intVal, cast == float64(intVal) && !overflows
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// serialized string -> try to convert to float
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case string:
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num := json.Number(cast)
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intVal, err := num.Int64()
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return int(intVal), err == nil
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// serialized string -> try to convert to float
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case []byte:
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num := json.Number(cast)
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intVal, err := num.Int64()
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return int(intVal), err == nil
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// unknown type
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default:
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return 0, false
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}
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}
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}
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