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is_int_validator.go
60 lines (52 loc) · 1.15 KB
/
is_int_validator.go
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package validators
import (
"errors"
"fmt"
)
// Checks if the value is a number or null.
//
// Configuration parameters:
// - errorMessage (string): custom error message (optional).
//
// Input value (int): value to be validated.
//
// Usage examples:
//
// value1 := 1
// v.IsInt()(value1) // Output: nil, false
//
// value3 := nil
// v.IsInt()(value3) // Output: [error message], true
//
// value2 := 1.0
// v.IsInt()(value2) // Output: [error message], true
//
// value4 := ""
// v.IsInt()(value4) // Output: [error message], true
// v.IsInt("error")(value4) // Output: "error", true
func IsInt(
errorMessage ...string,
) Validator {
message := ""
if len(errorMessage) != 0 {
message = errorMessage[0]
}
return func(value any) (error, bool) {
valueFloat, isFloat := value.(float64)
isInt := false
switch value.(type) {
case int, int8, int16, int32, int64:
isInt = true
}
if isFloat && float64(int(valueFloat)) == valueFloat || isInt {
return nil, false
}
if message == "" {
message = fmt.Sprintf(
"The value is not an integer: value is %T.",
value,
)
}
return errors.New(message), true
}
}