Mihaela Mihaljevic
d2f18a2685
An element declaring substitutionGroup="head" whose own type is unrelated to the head's type was accepted; XSD 1.0 e-props-correct.4 requires the member's type be validly derived from the head's. The check runs after named types resolve and reuses the restriction/extension + built-in-lattice derivation oracle (an ur-type head admits any member). It is conservative so it never rejects a valid member: it runs only for a self-contained schema (no import/include/redefine, where the derivation table is complete and single-namespace names are unambiguous), reads the member's type from its own type attribute and the head's from the top-level element declarations only (so a local element of the same name supplies neither), and stands down when either type is a list or union (cos-st-derived-ok clauses 2.3/2.4 union-member derivation is not modelled). The post-namedTypes consistency calls move into a postNamedTypeErrors aggregator alongside consistencyErrors. XSTS: invalid schemas accepted 480 to 479, no other bucket raised.
73 lines
4.1 KiB
Swift
73 lines
4.1 KiB
Swift
extension PureXML.Schema.XSDParser {
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/// Schema-validity findings for the `id` attributes in a schema document. The
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/// `id` attribute on any XSD component is of type `xs:ID`, so each value must
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/// be a valid NCName and all values must be unique within the document
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/// (XSD Structures: `xs:ID` and the ID/IDREF constraints). The values were
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/// never checked, so a malformed (`id=""`, `id="123"`) or duplicated `id` left
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/// the schema wrongly accepted.
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///
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/// Walks the one document rooted at `schema`; an included or imported document
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/// keeps its own `id` scope, so cross-document collisions are not flagged here.
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static func idAttributeErrors(_ schema: XSDTree) -> [String] {
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var errors: [String] = []
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var seen: Set<String> = []
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collectIDErrors(schema, into: &errors, seen: &seen)
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return errors
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}
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private static func collectIDErrors(_ node: XSDTree, into errors: inout [String], seen: inout Set<String>) {
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// `appinfo` and `documentation` hold arbitrary foreign content whose own
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// `id` attributes are not xs:ID; do not descend into them.
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let local = PureXML.Schema.XSDNode.localName(node)
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if local == "appinfo" || local == "documentation" { return }
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if let id = unprefixedID(node) {
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if !PureXML.Schema.Lexical.isNCName(id) {
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errors.append("id attribute value '\(id)' is not a valid NCName")
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} else if !seen.insert(id).inserted {
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errors.append("duplicate id attribute value '\(id)' in the schema document")
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}
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}
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for child in PureXML.Schema.XSDNode.elementChildren(node) {
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collectIDErrors(child, into: &errors, seen: &seen)
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}
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}
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/// The value of the unprefixed, no-namespace `id` attribute (the xs:ID one),
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/// or nil. A prefixed attribute such as `xml:id` or a foreign `pre:id` is a
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/// different attribute and is not the schema-component identifier.
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private static func unprefixedID(_ node: XSDTree) -> String? {
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node.attributes.first { $0.name.prefix == nil && $0.name.localName == "id" }?.value
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}
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/// All compile-time schema-consistency findings, collected together so they are
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/// reported in one pass: `id` validity, schema-for-schemas structure, global
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/// component-name uniqueness, content-model determinism (UPA), and circular
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/// type derivation. The explicit return type keeps the type-checker from
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/// inferring a long concatenation.
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static func consistencyErrors(_ schema: XSDTree, _ context: PureXML.Schema.XSDContext, _ containers: [XSDTree]) -> [String] {
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let structural = idAttributeErrors(schema) + structureErrors(schema) + componentNameErrors(schema)
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let determinism = PureXML.Schema.ContentModelDeterminism.violations(in: schema, context: context)
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let cycles = derivationCycleErrors(containers, context.namespaceBindings, context.targetNamespace)
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+ circularReferenceErrors(containers, context.namespaceBindings, context.targetNamespace)
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let placement = allGroupReferencePlacementErrors(containers, context.namespaceBindings, context.targetNamespace)
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return structural + determinism + cycles + placement
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}
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/// Consistency findings that depend on the resolved named types, collected after
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/// `namedTypes` has populated them: unresolved references, attribute-use
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/// uniqueness and single-ID, ID-typed value constraints, and substitution-group
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/// member type derivation (`e-props-correct.4`).
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static func postNamedTypeErrors(
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_ schema: XSDTree,
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_ context: PureXML.Schema.XSDContext,
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_ containers: [XSDTree],
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_ derivation: DerivationTables,
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typeMaps: (global: [String: PureXML.Schema.ElementType], named: [String: PureXML.Schema.ElementType]),
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) -> [String] {
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referenceErrors(schema, in: context, elements: typeMaps.global)
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+ attributeUseErrors(containers, context)
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+ idValueConstraintErrors(schema, context)
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+ substitutionTypeErrors(schema, derivation, typeMaps.named)
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}
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}
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