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package it |
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import ( |
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"strings" |
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"github.com/muonsoft/validation" |
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"github.com/muonsoft/validation/code" |
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"github.com/muonsoft/validation/message" |
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) |
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// ChoiceConstraint is used to ensure that the given value corresponds to one of the expected choices. |
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type ChoiceConstraint struct { |
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choices map[string]bool |
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choicesValue string |
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messageTemplate string |
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isIgnored bool |
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} |
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// IsOneOfStrings creates a ChoiceConstraint for checking that values are in the expected list of strings. |
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// |
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// Example |
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// err := validator.ValidateString(&s, it.IsOneOfStrings("one", "two", "three)) |
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func IsOneOfStrings(values ...string) ChoiceConstraint { |
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choices := make(map[string]bool, len(values)) |
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for _, value := range values { |
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choices[value] = true |
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} |
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return ChoiceConstraint{ |
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choices: choices, |
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choicesValue: strings.Join(values, ", "), |
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messageTemplate: message.NoSuchChoice, |
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} |
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} |
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// SetUp will return an error if the list of choices is empty. |
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func (c ChoiceConstraint) SetUp(scope *validation.Scope) error { |
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if len(c.choices) == 0 { |
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return errEmptyChoices |
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} |
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return nil |
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} |
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// Name is the constraint name. |
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func (c ChoiceConstraint) Name() string { |
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return "ChoiceConstraint" |
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} |
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// Message sets the violation message template. You can use template parameters |
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// for injecting its values into the final message: |
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// |
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// {{ choices }} - a comma-separated list of available choices; |
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// {{ value }} - the current (invalid) value. |
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func (c ChoiceConstraint) Message(message string) ChoiceConstraint { |
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c.messageTemplate = message |
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return c |
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} |
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// When enables conditional validation of this constraint. If the expression evaluates to false, |
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// then the constraint will be ignored. |
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func (c ChoiceConstraint) When(condition bool) ChoiceConstraint { |
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c.isIgnored = !condition |
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return c |
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} |
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func (c ChoiceConstraint) ValidateString(value *string, scope validation.Scope) error { |
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if c.isIgnored || value == nil || *value == "" { |
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return nil |
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} |
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if c.choices[*value] { |
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return nil |
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} |
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return scope. |
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BuildViolation(code.NoSuchChoice, c.messageTemplate). |
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SetParameters(map[string]string{ |
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"{{ value }}": *value, |
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"{{ choices }}": c.choicesValue, |
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}). |
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GetViolation() |
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} |
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muonsoft /
validation
