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
24 lines
978 B
Swift
24 lines
978 B
Swift
public extension PureXML.XPath {
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/// An error compiling or evaluating an XPath query in the supported subset.
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enum QueryError: Swift.Error, Equatable, Sendable, CustomStringConvertible {
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case empty
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case unexpectedToken(String)
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case expectedNodeTest
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case unterminatedPredicate
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case unsupportedPredicate(String)
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/// An axis name was not one of the thirteen XPath axes.
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case unsupportedAxis(String)
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public var description: String {
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switch self {
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case .empty: "the XPath expression is empty"
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case let .unexpectedToken(token): "unexpected token '\(token)'"
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case .expectedNodeTest: "expected a node test"
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case .unterminatedPredicate: "unterminated predicate"
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case let .unsupportedPredicate(detail): "unsupported predicate: \(detail)"
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case let .unsupportedAxis(axis): "unsupported axis: \(axis)"
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}
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}
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}
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}
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