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package internal |
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import ( |
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"math" |
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"reflect" |
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"strconv" |
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"github.com/gotilty/gotil/internal/errs" |
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) |
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//ToInt16 returns int16(0) with an error if the parameter is unsupported type. |
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//Just works with all primitive types. |
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func ToInt16(a interface{}) (int16, error) { |
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val := reflect.ValueOf(a) |
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switch val.Kind() { |
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: |
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return fromInt64ToInt16(val.Int()) |
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case reflect.Float32, reflect.Float64: |
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return fromFloat64ToInt16(val.Float()) |
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case reflect.String: |
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return fromStringToInt16(val.String()) |
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64: |
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return fromUint64ToInt16(val.Uint()) |
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case reflect.Bool: |
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return fromBoolToInt16(val.Bool()) |
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default: |
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return 0, errs.Int16Error(val.Kind().String()) |
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} |
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} |
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func fromInt64ToInt16(s int64) (int16, error) { |
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var maxInt int64 = math.MaxInt16 + 1 |
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// maxInt == 2147483648 |
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if s > maxInt { |
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return 0, errs.CustomError("The entered number cannot be greater than max int16.") |
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} |
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return int16(s), nil |
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} |
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func fromFloat64ToInt16(s float64) (int16, error) { |
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var maxInt int64 = math.MaxInt16 + 1 |
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if s > float64(maxInt) { |
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return 0, errs.CustomError("The entered number cannot be greater than max int16.") |
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} |
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return int16(s), nil |
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} |
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func fromStringToInt16(s string) (int16, error) { |
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if s == "" { |
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return 0, nil |
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} |
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d, err := strconv.ParseInt(s, 10, 16) |
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if err == nil { |
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return fromInt64ToInt16(d) |
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} |
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return 0, err |
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} |
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func fromUint64ToInt16(s uint64) (int16, error) { |
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var maxInt int64 = math.MaxInt16 + 1 |
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if s > uint64(maxInt) { |
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return 0, errs.CustomError("The entered number cannot be greater than max int16.") |
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} |
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return int16(s), nil |
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} |
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func fromBoolToInt16(s bool) (int16, error) { |
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if s { |
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return 1, nil |
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} else { |
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return 0, nil |
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} |
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} |
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gotilty /
gotil
