Mihaela Mihaljevic
e30672d72b
case-order=upper-first/lower-first makes the string comparison case-insensitive, with case used only to break ties among otherwise-equal strings; without it the default codepoint order is unchanged. Part of #82.
38 lines
1.9 KiB
Swift
38 lines
1.9 KiB
Swift
extension PureXML.XSLT.Transformer {
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/// Compares strings case-insensitively, with `caseOrder` breaking ties among
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/// strings that differ only in case (the XSLT `case-order` semantics).
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static func caseInsensitiveCompare(_ left: String, _ right: String, _ caseOrder: PureXML.XSLT.CaseOrder) -> Int {
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let leftLower = left.lowercased()
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let rightLower = right.lowercased()
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if leftLower != rightLower { return leftLower < rightLower ? -1 : 1 }
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if left == right { return 0 }
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// Equal apart from case: codepoint order puts uppercase first.
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let upperFirst = left < right
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let leftFirst = caseOrder == .upperFirst ? upperFirst : !upperFirst
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return leftFirst ? -1 : 1
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}
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/// Rewrites a literal name in an `xsl:namespace-alias`ed stylesheet namespace
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/// to its result namespace and prefix; other names pass through unchanged.
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func aliased(_ name: PureXML.Model.QualifiedName) -> PureXML.Model.QualifiedName {
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guard let alias = stylesheet.namespaceAliases[name.namespaceURI ?? ""] else { return name }
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return PureXML.Model.QualifiedName(prefix: alias.prefix, localName: name.localName, namespaceURI: alias.uri)
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}
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/// The attributes with duplicates by name removed, keeping the last (so a
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/// later attribute overrides one from an attribute set or an earlier source).
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static func deduplicated(_ attributes: [PureXML.Model.Attribute]) -> [PureXML.Model.Attribute] {
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var indexByName: [String: Int] = [:]
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var result: [PureXML.Model.Attribute] = []
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for attribute in attributes {
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if let index = indexByName[attribute.name.description] {
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result[index] = attribute
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} else {
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indexByName[attribute.name.description] = result.count
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result.append(attribute)
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}
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}
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return result
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}
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}
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