Mihaela Mihaljevic
cff26b255d
Same-name xsl:attribute-set declarations merge as ordered definitions per 7.1.4, each expanding its used sets before its own attributes with later definitions winning; xsl:copy carries the source element's in-scope namespace nodes per 7.5; the namespace fixup lets a carried attribute prefix shadow an inherited binding unless the element's own name relies on it; the html method minimizes boolean attributes whose value repeats their name; and external DTDs and entities in the stylesheet or source resolve through the transform's document loader. Four unit tests pin the behaviors. Xalan baseline 174 -> 159 (attribset 13 -> 4, copy 12 -> 7).
34 lines
1.4 KiB
Swift
34 lines
1.4 KiB
Swift
extension PureXML.XSLT {
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/// Wraps a transform's document loader as an entity resolver, so external
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/// DTDs and entities referenced by the stylesheet or source resolve
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/// through the same channel as document(). The loader is used from a
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/// single thread for the duration of one parse.
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static func loaderResolver(_ loader: @escaping (String) -> String?) -> PureXML.Parsing.EntityResolver {
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let box = LoaderBox(load: loader)
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return PureXML.Parsing.EntityResolver(
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resolveEntity: { _, id in box.load(id.resolvedSystemID) },
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resolveExternalSubset: { id in box.load(id.resolvedSystemID) },
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)
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}
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/// A single-threaded loader carried into the resolver's Sendable
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/// closures; XSLT transforms are confined to one thread.
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private struct LoaderBox: @unchecked Sendable {
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let load: (String) -> String?
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}
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/// The key indexes a transform has built, one per document root.
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final class KeyIndexCache {
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var indexes: [ObjectIdentifier: KeyIndex] = [:]
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}
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/// The documents a transform has loaded, keyed by URI: per the XSLT
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/// `document()` definition the same reference returns the identical
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/// document, so node identity (and `generate-id()`) is stable across
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/// calls within one transform.
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final class DocumentCache {
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var trees: [String: PureXML.Model.TreeNode] = [:]
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var sources: [String: PureXML.Model.Node] = [:]
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}
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}
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