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package it |
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import ( |
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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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"regexp" |
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"strconv" |
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"unicode/utf8" |
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) |
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// LengthConstraint checks that a given string length is between some minimum and maximum value. |
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type LengthConstraint struct { |
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isIgnored bool |
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checkMin bool |
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checkMax bool |
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min int |
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max int |
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minMessageTemplate string |
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maxMessageTemplate string |
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exactMessageTemplate string |
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} |
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func newLengthConstraint(min int, max int, checkMin bool, checkMax bool) LengthConstraint { |
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return LengthConstraint{ |
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min: min, |
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max: max, |
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checkMin: checkMin, |
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checkMax: checkMax, |
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minMessageTemplate: message.LengthTooFew, |
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maxMessageTemplate: message.LengthTooMany, |
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exactMessageTemplate: message.LengthExact, |
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} |
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} |
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func HasMinLength(min int) LengthConstraint { |
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return newLengthConstraint(min, 0, true, false) |
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} |
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func HasMaxLength(max int) LengthConstraint { |
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return newLengthConstraint(0, max, false, true) |
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} |
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func HasLengthBetween(min int, max int) LengthConstraint { |
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return newLengthConstraint(min, max, true, true) |
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} |
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func HasExactLength(count int) LengthConstraint { |
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return newLengthConstraint(count, count, true, true) |
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} |
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func (c LengthConstraint) SetUp(scope *validation.Scope) error { |
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return nil |
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} |
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func (c LengthConstraint) Name() string { |
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return "LengthConstraint" |
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} |
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func (c LengthConstraint) When(condition bool) LengthConstraint { |
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c.isIgnored = !condition |
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return c |
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} |
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func (c LengthConstraint) MinMessage(message string) LengthConstraint { |
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c.minMessageTemplate = message |
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return c |
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} |
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func (c LengthConstraint) MaxMessage(message string) LengthConstraint { |
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c.maxMessageTemplate = message |
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return c |
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} |
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func (c LengthConstraint) ExactMessage(message string) LengthConstraint { |
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c.exactMessageTemplate = message |
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return c |
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} |
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func (c LengthConstraint) 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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count := utf8.RuneCountInString(*value) |
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if c.checkMax && count > c.max { |
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return c.newViolation(count, c.max, code.LengthTooMany, c.maxMessageTemplate, scope) |
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} |
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if c.checkMin && count < c.min { |
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return c.newViolation(count, c.min, code.LengthTooFew, c.minMessageTemplate, scope) |
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} |
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return nil |
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} |
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func (c LengthConstraint) newViolation( |
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count, limit int, |
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violationCode, message string, |
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scope validation.Scope, |
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) validation.Violation { |
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if c.checkMin && c.checkMax && c.min == c.max { |
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message = c.exactMessageTemplate |
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violationCode = code.LengthExact |
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} |
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return scope.BuildViolation(violationCode, message). |
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SetPluralCount(limit). |
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SetParameters(map[string]string{ |
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"{{ count }}": strconv.Itoa(count), |
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"{{ limit }}": strconv.Itoa(limit), |
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}). |
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GetViolation() |
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} |
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// RegexConstraint is used to ensure that the given value corresponds to regex pattern. |
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type RegexConstraint struct { |
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isIgnored bool |
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messageTemplate string |
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pattern string |
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} |
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// IsRegexMatch creates a RegexConstraint for checking whether a value match. |
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// |
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// Example |
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// err := validator.ValidateString(&s, it.IsRegexMatch("^[a-z]+$")) |
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func IsRegexMatch(pattern string) RegexConstraint { |
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return RegexConstraint{ |
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pattern: pattern, |
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messageTemplate: message.Regex, |
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} |
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} |
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// SetUp will return an error if the pattern is empty. |
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func (c RegexConstraint) SetUp(scope *validation.Scope) error { |
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if c.pattern == "" { |
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return errEmptyPattern |
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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 RegexConstraint) Name() string { |
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return "RegexConstraint" |
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} |
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// Message sets the violation message template. You can use template parameters. |
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func (c RegexConstraint) Message(message string) RegexConstraint { |
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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 RegexConstraint) When(condition bool) RegexConstraint { |
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c.isIgnored = !condition |
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return c |
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} |
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func (c RegexConstraint) 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 match, _ := regexp.MatchString(c.pattern, *value); match { |
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return nil |
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} |
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return scope. |
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BuildViolation(code.Regex, c.messageTemplate). |
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GetViolation() |
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} |
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muonsoft /
validation
