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package validation |
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import ( |
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"encoding/json" |
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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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1 |
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// IsIndex on PropertyName always returns false. |
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func (p PropertyName) IsIndex() bool { |
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return false |
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} |
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1 |
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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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func (a ArrayIndex) IsIndex() bool { |
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return true |
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} |
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1 |
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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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return path.With(elements...) |
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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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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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1 |
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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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s := "" |
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element := path |
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1 |
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for element != nil { |
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if element.value.IsIndex() { |
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s = "[" + element.value.String() + "]" + s |
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1 |
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} else { |
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name, isBracketed := encodePropertyName(element.value.String()) |
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s = name + s |
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if !isBracketed && element.parent != nil { |
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s = "." + s |
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1 |
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} |
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} |
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element = element.parent |
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} |
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return s |
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} |
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// MarshalJSON will marshal property path value to a JSON string. |
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func (path *PropertyPath) MarshalJSON() ([]byte, error) { |
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return json.Marshal(path.String()) |
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} |
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func encodePropertyName(name string) (string, bool) { |
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chars := []rune(name) |
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if len(chars) == 0 { |
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return `['']`, false |
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} |
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var encoded strings.Builder |
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encoded.Grow(len(chars)) |
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needBracketing := false |
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if !unicode.IsLetter(chars[0]) { |
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needBracketing = true |
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} |
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for i := 0; i < len(chars); i++ { |
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c := chars[i] |
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if i > 0 && !unicode.IsLetter(c) && !unicode.IsDigit(c) { |
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needBracketing = true |
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} |
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if c == '\'' || c == '\\' { |
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encoded.WriteRune('\\') |
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} |
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encoded.WriteRune(c) |
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} |
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s := encoded.String() |
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if needBracketing { |
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return `['` + s + `']`, true |
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} |
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return s, false |
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} |
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muonsoft /
validation
