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package validation_test |
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import ( |
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"context" |
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"errors" |
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"fmt" |
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"regexp" |
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"github.com/muonsoft/validation" |
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"github.com/muonsoft/validation/it" |
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"github.com/muonsoft/validation/validator" |
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) |
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var ErrNotNumeric = errors.New("not numeric") |
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type NumericConstraint struct { |
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matcher *regexp.Regexp |
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} |
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// it is recommended to use semantic constructors for constraints. |
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func IsNumeric() NumericConstraint { |
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return NumericConstraint{matcher: regexp.MustCompile("^[0-9]+$")} |
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} |
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func (c NumericConstraint) ValidateString(ctx context.Context, validator *validation.Validator, value *string) error { |
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// usually, you should ignore empty values |
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// to check for an empty value you should use it.NotBlankConstraint |
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if value == nil || *value == "" { |
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return nil |
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} |
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if c.matcher.MatchString(*value) { |
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return nil |
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} |
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// use the validator to build violation with translations |
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return validator.CreateViolation(ctx, ErrNotNumeric, "This value should be numeric.") |
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} |
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func ExampleValidator_Validate_customConstraint() { |
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s := "alpha" |
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err := validator.Validate( |
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context.Background(), |
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validation.String(s, it.IsNotBlank(), IsNumeric()), |
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) |
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fmt.Println(err) |
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fmt.Println("errors.Is(err, ErrNotNumeric) =", errors.Is(err, ErrNotNumeric)) |
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// Output: |
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// violation: "This value should be numeric." |
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// errors.Is(err, ErrNotNumeric) = true |
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} |
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muonsoft /
validation
