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.
49 lines
2.1 KiB
Swift
49 lines
2.1 KiB
Swift
public extension PureYAML.Validation {
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/// A type-directed validation value (the `Validation<Subject>` of the validation idiom): a
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/// positive `description`, a `predicate` that gates application, and a multi-error `check`. It is
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/// applied only to values of type `Subject`, anywhere they occur in the traversed tree.
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struct Check<Subject: Validatable>: Sendable {
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public let description: String
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public let predicate: @Sendable (SubjectContext<Subject>) -> Bool
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public let check: @Sendable (SubjectContext<Subject>) -> [Issue]
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/// Multi-error form: return one issue per problem. Use when a subject can fail several ways.
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public init(
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description: String,
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check: @escaping @Sendable (SubjectContext<Subject>) -> [Issue],
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when predicate: @escaping @Sendable (SubjectContext<Subject>) -> Bool = { _ in true },
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) {
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self.description = description
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self.predicate = predicate
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self.check = check
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}
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/// Single-error Bool form: a positive description plus a check whose `false` auto-produces the
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/// one issue `"Failed to satisfy: <description>"`. The dominant form.
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public init(
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description: String,
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severity: Severity = .error,
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check: @escaping @Sendable (SubjectContext<Subject>) -> Bool,
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when predicate: @escaping @Sendable (SubjectContext<Subject>) -> Bool = { _ in true },
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) {
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self.init(
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description: description,
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check: { context in
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check(context)
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? []
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: [Issue(severity: severity, reason: "Failed to satisfy: \(description)", path: context.path)]
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},
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when: predicate,
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)
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}
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/// Gates on the predicate, then runs the check.
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public func apply(_ context: SubjectContext<Subject>) -> [Issue] {
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guard predicate(context) else {
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return []
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}
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return check(context)
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}
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}
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}
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