Mihaela Mihaljevic
e862f364aa
Add the PureXML.Schema namespace validating XSD Part 2 built-in datatypes and constraining facets. Built-ins span string/boolean/decimal, the bounded integer family with intrinsic bounds, float/double, duration, the eight date/time types, hexBinary, base64Binary, anyURI, QName, and the Name/NCName/NMTOKEN/language family. Facets: length/minLength/maxLength, pattern (via the regex engine), enumeration (value-space comparison), whiteSpace, min/maxInclusive/Exclusive, totalDigits, fractionDigits. Decimals compare exactly with no floating-point loss; date/time fields are range-validated with leap years, 24:00:00, and timezone bounds. Closes #8
107 lines
3.8 KiB
Swift
107 lines
3.8 KiB
Swift
extension PureXML.Schema {
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/// A value compared for the ordering facets (`minInclusive` and friends).
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enum OrderedValue: Equatable, Comparable {
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case decimal(DecimalValue)
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case double(Double)
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case dateTime(DateTimeValue)
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static func < (lhs: OrderedValue, rhs: OrderedValue) -> Bool {
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switch (lhs, rhs) {
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case let (.decimal(left), .decimal(right)): left < right
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case let (.double(left), .double(right)): left < right
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case let (.dateTime(left), .dateTime(right)): left < right
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default: false
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}
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}
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}
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/// An XSD primitive value space: the lexical recognizer, and for the ordered
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/// spaces a value usable by the ordering facets.
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enum Primitive: Sendable {
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case string
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case boolean
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case decimal
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case integer
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case double
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case float
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case duration
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case dateKind(DateKind)
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case hexBinary
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case base64Binary
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case anyURI
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case qName
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case name
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case ncName
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case nmtoken
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case language
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func isValid(_ value: String) -> Bool {
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stringValidity(value) ?? numericValidity(value)
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}
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/// Validity for the string-like and boolean spaces; nil when this primitive
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/// is handled by ``numericValidity(_:)``.
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private func stringValidity(_ value: String) -> Bool? {
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switch self {
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case .string, .anyURI: true
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case .boolean: Lexical.isBoolean(value)
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case .qName: Lexical.isQName(value)
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case .name: Lexical.isName(value)
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case .ncName: Lexical.isNCName(value)
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case .nmtoken: Lexical.isNMToken(value)
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case .language: Lexical.isLanguage(value)
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default: nil
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}
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}
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private func numericValidity(_ value: String) -> Bool {
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switch self {
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case .decimal: DecimalValue(value, allowFraction: true) != nil
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case .integer: DecimalValue(value, allowFraction: false) != nil
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case .double, .float: Lexical.isFloating(value)
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case .duration: Lexical.isDuration(value)
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case let .dateKind(kind): DateTimeParser.parse(value, kind: kind) != nil
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case .hexBinary: Lexical.isHexBinary(value)
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case .base64Binary: Lexical.isBase64Binary(value)
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default: false
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}
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}
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/// The ordering value for a lexically valid string, or nil for the
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/// unordered spaces.
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func ordered(_ value: String) -> OrderedValue? {
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switch self {
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case .decimal: DecimalValue(value, allowFraction: true).map(OrderedValue.decimal)
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case .integer: DecimalValue(value, allowFraction: false).map(OrderedValue.decimal)
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case .double, .float: Self.floatingValue(value).map(OrderedValue.double)
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case let .dateKind(kind): DateTimeParser.parse(value, kind: kind).map(OrderedValue.dateTime)
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default: nil
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}
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}
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private static func floatingValue(_ value: String) -> Double? {
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switch value {
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case "INF": .infinity
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case "-INF": -.infinity
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case "NaN": .nan
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default: Double(value)
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}
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}
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/// The unit `length`, `minLength`, and `maxLength` count: octets for binary
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/// types, characters otherwise.
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func measuredLength(_ value: String) -> Int {
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switch self {
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case .hexBinary: value.count / 2
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case .base64Binary: Self.base64Octets(value)
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default: value.count
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}
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}
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private static func base64Octets(_ value: String) -> Int {
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let padding = value.reversed().prefix { $0 == "=" }.count
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return value.count / 4 * 3 - padding
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}
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}
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}
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