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package validation |
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import ( |
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"fmt" |
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"strconv" |
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"strings" |
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"unicode" |
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) |
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// PropertyPathElement is a part of the PropertyPath. |
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type PropertyPathElement interface { |
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// IsIndex can be used to determine whether an element is a string (property name) or |
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// an index array. |
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IsIndex() bool |
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fmt.Stringer |
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} |
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// PropertyName holds up property name value under PropertyPath. |
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type PropertyName string |
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// IsIndex on PropertyName always returns false. |
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1 |
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func (p PropertyName) IsIndex() bool { |
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return false |
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} |
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// String returns property name as is. |
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func (p PropertyName) String() string { |
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return string(p) |
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} |
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// ArrayIndex holds up array index value under PropertyPath. |
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type ArrayIndex int |
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// IsIndex on ArrayIndex always returns true. |
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1 |
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func (a ArrayIndex) IsIndex() bool { |
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return true |
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} |
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// String returns array index values converted into a string. |
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func (a ArrayIndex) String() string { |
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return strconv.Itoa(int(a)) |
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} |
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// PropertyPath is generated by the validator and indicates how it reached the invalid value |
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// from the root element. Property path is denoted by dots, while array access |
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// is denoted by square brackets. For example, "book.keywords[0]" means that the violation |
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// occurred on the first element of array "keywords" in the "book" object. |
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// |
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// Internally PropertyPath is a linked list. You can create a new path using WithProperty |
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// or WithIndex methods. PropertyPath should always be used as a pointer value. |
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// Nil value is a valid value that means that the property path is empty. |
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type PropertyPath struct { |
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parent *PropertyPath |
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value PropertyPathElement |
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} |
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// NewPropertyPath creates a PropertyPath from the list of elements. If the list is empty nil will be returned. |
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// Nil value is a valid value that means that the property path is empty. |
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func NewPropertyPath(elements ...PropertyPathElement) *PropertyPath { |
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var path *PropertyPath |
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1 |
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return path.With(elements...) |
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1 |
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} |
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// With returns new PropertyPath with appended elements to the end of the list. |
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func (path *PropertyPath) With(elements ...PropertyPathElement) *PropertyPath { |
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current := path |
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1 |
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for _, element := range elements { |
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current = &PropertyPath{parent: current, value: element} |
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} |
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return current |
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} |
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// WithProperty returns new PropertyPath with appended PropertyName to the end of the list. |
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func (path *PropertyPath) WithProperty(name string) *PropertyPath { |
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return &PropertyPath{ |
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parent: path, |
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value: PropertyName(name), |
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} |
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} |
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// WithIndex returns new PropertyPath with appended ArrayIndex to the end of the list. |
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func (path *PropertyPath) WithIndex(index int) *PropertyPath { |
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return &PropertyPath{ |
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parent: path, |
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value: ArrayIndex(index), |
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} |
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} |
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// String is used to format property path to a string. |
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func (path *PropertyPath) String() string { |
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elements := make([]PropertyPathElement, 0, 8) |
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element := path |
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count := 0 |
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1 |
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for element != nil { |
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if s, ok := element.value.(PropertyName); ok { |
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count += len(s) |
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1 |
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} else { |
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count += 2 |
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} |
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elements = append(elements, element.value) |
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element = element.parent |
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} |
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s := strings.Builder{} |
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s.Grow(count) |
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for i := len(elements) - 1; i >= 0; i-- { |
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name := elements[i].String() |
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if elements[i].IsIndex() { |
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s.WriteString("[" + name + "]") |
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} else if isIdentifier(name) { |
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if i < len(elements)-1 { |
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s.WriteString(".") |
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} |
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s.WriteString(name) |
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} else { |
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s.WriteString("['") |
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writePropertyName(&s, name) |
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s.WriteString("']") |
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} |
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} |
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return s.String() |
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} |
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// MarshalText will marshal property path value to a string. |
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func (path *PropertyPath) MarshalText() (text []byte, err error) { |
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return []byte(path.String()), nil |
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} |
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func isIdentifier(s string) bool { |
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if len(s) == 0 { |
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return false |
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} |
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for i, c := range s { |
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if i == 0 && !unicode.IsLetter(c) { |
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return false |
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} |
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if i > 0 && !unicode.IsLetter(c) && !unicode.IsDigit(c) { |
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return false |
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} |
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} |
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return true |
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} |
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func writePropertyName(s *strings.Builder, name string) { |
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for _, c := range name { |
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if c == '\'' || c == '\\' { |
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s.WriteRune('\\') |
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} |
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s.WriteRune(c) |
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} |
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} |
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muonsoft /
validation
