Mihaela M
2e45ecaffe
Introduce the core of the validation-rules idiom: a Check<Subject> with a positive description, a when predicate, and a Bool or multi-error check that fires only on values of its Subject type wherever they occur. AnyCheck erases the subject and dispatches by runtime type, guarding an optional or a wrong type from matching. The validator gains a checks list, a validating(_:) overload, and a traversal that offers each node the values it may specialise on. BuiltinCheck.mappingKeysAreUnique is the type-directed counterpart of the legacy rule. The machinery has its own negative tests (wrong type, optional, false predicate yield nothing; same type twice yields two errors) and the builtin ships a failing and a near-miss test. The coverage gate catches the five new public types, which are classified as validation machinery. The default validator is unchanged, so this is additive; retiring the legacy Rule, moving the default onto the check, the combinator algebra, the error rendering, and de-duplicating the Tagged validator are the remaining steps.
28 lines
1.1 KiB
Swift
28 lines
1.1 KiB
Swift
public extension PureYAML.Validation {
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/// A type-erased `Check`, so checks specialised on different subject types live in one list. It
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/// filters by runtime type: a `Check<Subject>` fires only on a `Subject` value, never on an
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/// optional of it (the `type(of:)` guard) or a value of any other type.
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struct AnyCheck: Sendable {
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public let description: String
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private let applyErased: @Sendable (any Validatable, Path, PureYAML.Model.Value) -> [Issue]
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public init<Subject: Validatable>(_ check: Check<Subject>) {
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description = check.description
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applyErased = { subject, path, document in
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guard let typed = subject as? Subject, type(of: subject) == Subject.self else {
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return []
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}
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return check.apply(SubjectContext(document: document, subject: typed, path: path))
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}
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}
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public func apply(
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to subject: any Validatable,
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at path: Path,
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in document: PureYAML.Model.Value,
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) -> [Issue] {
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applyErased(subject, path, document)
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}
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}
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}
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