Mihaela Mihaljevic
6b7853f2d5
Rebuild the XPath engine on the parent-aware tree. Add an XPath node abstraction (tree, attribute, namespace) with document order, and navigate all thirteen axes: child, descendant, parent, ancestor, following-sibling, preceding-sibling, following, preceding, attribute, namespace, self, descendant-or-self, ancestor-or-self. Support the ./../@/// abbreviations and processing-instruction() node tests. Reverse axes number nearest-first for positional predicates; results return de-duplicated in document order. The attribute axis excludes xmlns declarations; the namespace axis surfaces in-scope namespace nodes. Closes #40
18 lines
659 B
Swift
18 lines
659 B
Swift
extension PureXML.XPath {
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/// The node test of a location step: which nodes on the axis qualify.
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enum NodeTest: Equatable {
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/// A name match (`book`), tested against the axis's principal node kind.
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case name(String)
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/// The `*` wildcard (any node of the axis's principal kind).
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case wildcard
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/// `text()`: character-data and CDATA nodes.
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case text
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/// `node()`: any node.
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case node
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/// `comment()`: comment nodes.
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case comment
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/// `processing-instruction()`: PI nodes, optionally with a target literal.
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case processingInstruction(target: String?)
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}
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}
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