Mihaela Mihaljevic
3415ff3d9a
A RELAX NG schema document is validated before pattern interpretation in three layers: the section-3 grammar check (vocabulary, attributes, arity, text, QNames, datatypeLibrary URIs, hrefs, 4.16 excepts, xmlns prohibitions), compiler checks (4.17 combine rules, unresolved refs, parentRef scope, startless grammars, include/externalRef cycles and overrides, grammar-checked loaded documents, unknown datatypes, built-in-library params), and the 4.19/7.1-7.4 restrictions over the compiled algebra after 4.20/4.21 normalization (prohibited paths, content types, duplicate attributes via representative-name overlap, infinite-class attributes outside oneOrMore, interleave constraints), with recursion detection deliberately before normalization. Incorrect schemas: 213 compiling down to 7, all the pre-Fifth-Edition name-class class (count asserted). Two leniency tests updated to spec behavior. Closes #131
23 lines
1.2 KiB
Swift
23 lines
1.2 KiB
Swift
/// The RELAX NG restrictions of spec sections 4.19 and 7, checked over the
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/// compiled pattern algebra (refs resolved through the define table, elements
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/// as context boundaries): prohibited paths (7.1), computable content types
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/// (7.2), duplicate attributes (7.3), interleave constraints (7.4), the xmlns
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/// name-class prohibition (4.16), and ref recursion not guarded by an element
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/// (4.19).
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enum RelaxNGRestrictions {
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typealias Pattern = PureXML.Schema.Pattern
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typealias NameClass = PureXML.Schema.NameClass
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static func violation(start: Pattern, defines: [String: Pattern]) -> String? {
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// Recursion detection runs on the raw patterns: it happens before the
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// notAllowed normalization (4.19 precedes 4.20).
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if let problem = RelaxNGRestrictionChecker(defines: defines).recursionProblem(start: start) {
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return problem
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}
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let checker = RelaxNGRestrictionChecker(defines: defines.mapValues(RelaxNGRestrictionChecker.normalized))
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let normalizedStart = RelaxNGRestrictionChecker.normalized(start)
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if let problem = checker.startProblem(normalizedStart) { return problem }
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return checker.elementProblems(normalizedStart)
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}
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}
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