muonsoft /
validation
| Total Lines | 45 |
| Duplicated Lines | 0 % |
| Changes | 0 | ||
| 1 | package validation_test |
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| 2 | |||
| 3 | import ( |
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| 4 | "context" |
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| 5 | "fmt" |
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| 6 | "regexp" |
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| 7 | |||
| 8 | "github.com/muonsoft/validation" |
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| 9 | "github.com/muonsoft/validation/it" |
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| 10 | "github.com/muonsoft/validation/validator" |
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| 11 | ) |
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| 12 | |||
| 13 | type NumericConstraint struct { |
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| 14 | matcher *regexp.Regexp |
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| 15 | } |
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| 16 | |||
| 17 | // it is recommended to use semantic constructors for constraints. |
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| 18 | func IsNumeric() NumericConstraint { |
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| 19 | return NumericConstraint{matcher: regexp.MustCompile("^[0-9]+$")} |
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| 20 | } |
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| 21 | |||
| 22 | func (c NumericConstraint) ValidateString(value *string, scope validation.Scope) error { |
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| 23 | // usually, you should ignore empty values |
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| 24 | // to check for an empty value you should use it.NotBlankConstraint |
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| 25 | if value == nil || *value == "" { |
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| 26 | return nil |
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| 27 | } |
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| 28 | |||
| 29 | if c.matcher.MatchString(*value) { |
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| 30 | return nil |
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| 31 | } |
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| 32 | |||
| 33 | // use the scope to build violation with translations |
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| 34 | return scope.CreateViolation("notNumeric", "This value should be numeric.") |
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| 35 | } |
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| 36 | |||
| 37 | func ExampleValidator_Validate_customConstraint() { |
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| 38 | s := "alpha" |
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| 39 | |||
| 40 | err := validator.Validate( |
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| 41 | context.Background(), |
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| 42 | validation.String(s, it.IsNotBlank(), IsNumeric()), |
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| 43 | ) |
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| 44 | |||
| 45 | fmt.Println(err) |
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| 46 | // Output: |
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| 49 |
