Mihaela Mihaljevic
8ae3c79f42
Add Schema.Document compiling an xs:schema into global element declarations and a named-type table, and validate(_:) checking instance documents end to end. The parser supports global and local element declarations, named and inline simple and complex types, sequence/choice/all groups with occurrence, attribute uses, simple content (restriction/extension), the full facet set, and recursive types via named references resolved during validation. Extends ComplexType with a typeReference case and ComplexValidator with a type table so recursive schemas are representable. Closes #10
40 lines
1.6 KiB
Swift
40 lines
1.6 KiB
Swift
public extension PureXML.Schema {
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/// An error compiling or applying a schema.
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enum SchemaError: Swift.Error, Equatable, Sendable, CustomStringConvertible {
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case notASchema
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public var description: String {
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switch self {
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case .notASchema: "the document is not an xs:schema"
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}
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}
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}
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/// A compiled XSD schema: its global element declarations and named-type
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/// table, parsed from a schema document, used to validate instance documents.
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struct Document: Sendable {
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private let elements: [String: ElementType]
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private let types: [String: ElementType]
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/// Compiles a schema document.
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public init(_ xsd: String) throws {
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(elements, types) = try XSDParser.parse(xsd)
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}
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/// Validates an instance document against the schema, returning one issue
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/// per violation. Reports an issue when the root element has no global
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/// declaration.
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public func validate(_ xml: String) throws -> [PureXML.Validation.Issue] {
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guard case let .document(children) = try PureXML.parse(xml),
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let root = children.compactMap(\.element).first
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else {
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return [.init(severity: .error, message: "the document has no root element")]
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}
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guard let declaration = elements[root.name.localName] else {
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return [.init(severity: .error, message: "no element declaration for '\(root.name.localName)'")]
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}
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return ComplexValidator(types: types).validate(root, as: declaration)
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}
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}
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}
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