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package validation_test |
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import ( |
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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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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) SetUp(scope *validation.Scope) error { |
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// you may return errors here on the constraint initialization process |
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return nil |
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} |
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func (c NumericConstraint) GetName() string { |
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return "NumericConstraint" |
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} |
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func (c NumericConstraint) ValidateString(value *string, scope validation.Scope) 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 scope to build violation with translations |
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return scope.BuildViolation("notNumeric", "This value should be numeric.").GetViolation() |
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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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validation.String(&s, it.IsNotBlank(), IsNumeric()), |
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) |
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violations := err.(validation.ViolationList) |
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for _, violation := range violations { |
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fmt.Println(violation.Error()) |
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} |
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// Output: |
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// violation: This value should be numeric. |
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} |
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muonsoft /
validation
