Mihaela Mihaljevic
1646128b35
Templates carry their in-scope xmlns bindings into match patterns (match cache keyed on pattern plus bindings) and instantiated expressions, resolving prefixed name tests by namespace URI; with bindings supplied an unprefixed test selects only the null namespace, the XPath 1.0 rule. Instruction-scope capture includes the default declaration: xsl:element honors in-scope xmlns="uri" for unprefixed names, xmlns="" keeps them namespace-free, and an unusable created name drops the wrapper, keeping content. Xalan baseline 263 -> 218 (namespace 41 -> 13).
71 lines
3.3 KiB
Swift
71 lines
3.3 KiB
Swift
/// What one match pattern selected: tree-node and attribute identities.
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private struct PatternMatches {
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var trees: Set<ObjectIdentifier> = []
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var attributes: Set<PureXML.XSLT.AttributeIdentity> = []
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}
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extension PureXML.XSLT {
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/// An attribute node's identity: its owner's identity plus its name.
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struct AttributeIdentity: Hashable {
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let owner: ObjectIdentifier
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let name: String
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}
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/// Caches, per transform, the node set each match pattern selects over the
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/// source tree (tree nodes and attribute nodes), so a pattern is compiled
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/// and evaluated once per document rather than once per (node, template)
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/// pair during template selection.
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final class MatchCache {
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private var matched: [String: PatternMatches] = [:]
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/// The identities of the tree nodes `pattern` selects over `root`.
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func nodes(
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matching pattern: String,
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over root: PureXML.Model.TreeNode,
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functions: PureXML.XPath.FunctionTable = .init(),
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namespaces: [String: String] = [:],
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) -> Set<ObjectIdentifier> {
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compute(pattern, root, functions, namespaces).trees
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}
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/// The identities of the attribute nodes `pattern` selects over `root`.
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func attributes(
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matching pattern: String,
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over root: PureXML.Model.TreeNode,
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functions: PureXML.XPath.FunctionTable = .init(),
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namespaces: [String: String] = [:],
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) -> Set<AttributeIdentity> {
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compute(pattern, root, functions, namespaces).attributes
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}
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/// Computed and cached on first use; a branch that fails to compile
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/// selects nothing. The function table makes `key()` and `id()`
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/// patterns work; the bindings resolve prefixed name tests by URI.
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private func compute(_ pattern: String, _ root: PureXML.Model.TreeNode, _ functions: PureXML.XPath.FunctionTable, _ namespaces: [String: String]) -> PatternMatches {
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let key = pattern + "\u{1}" + namespaces.sorted(by: { $0.key < $1.key }).map { $0.key + "=" + $0.value }.joined(separator: ";")
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if let cached = matched[key] { return cached }
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var result = PatternMatches()
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for branch in pattern.split(separator: "|") {
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let trimmed = branch.trimmingXMLWhitespace()
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let path = trimmed.hasPrefix("/") || trimmed.hasPrefix("key(") || trimmed.hasPrefix("id(") ? trimmed : "//" + trimmed
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guard let query = try? PureXML.XPath.Query(path),
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let value = try? query.value(atNode: .tree(root), position: 1, size: 1, variables: [:], functions: functions, namespaces: namespaces),
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let selected = value.nodes
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else { continue }
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for node in selected {
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switch node {
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case let .tree(tree):
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result.trees.insert(ObjectIdentifier(tree))
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case let .attribute(owner, attribute):
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result.attributes.insert(AttributeIdentity(owner: ObjectIdentifier(owner), name: attribute.name.description))
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case .namespace:
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break
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}
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}
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}
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matched[key] = result
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return result
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}
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}
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}
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