Mihaela Mihaljevic
610b7d0ca0
A literal result element and its attributes in a stylesheet namespace bound by stylesheet-prefix are rewritten on output to the namespace and prefix bound by result-prefix (#default supported), so a stylesheet can emit literal xsl: elements. Prefixes resolve through the in-scope xmlns declarations; aliases fold across include/import. Splits AVT parsing into XSLTAVT.swift and trims the transformer to stay within length budgets.
42 lines
1.5 KiB
Swift
42 lines
1.5 KiB
Swift
extension PureXML.XSLT.XSLTParser {
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/// Parses an attribute value template: literal text with `{expr}` embedded
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/// XPath expressions, where `{{` and `}}` are literal braces.
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static func valueTemplate(_ string: String) -> PureXML.XSLT.ValueTemplate {
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var parts: [PureXML.XSLT.ValuePart] = []
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var literal = ""
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let characters = Array(string)
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var index = 0
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while index < characters.count {
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let character = characters[index]
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if character == "{", index + 1 < characters.count, characters[index + 1] == "{" {
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literal.append("{")
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index += 2
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continue
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}
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if character == "}", index + 1 < characters.count, characters[index + 1] == "}" {
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literal.append("}")
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index += 2
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continue
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}
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if character == "{" {
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if !literal.isEmpty { parts.append(.literal(literal))
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literal = ""
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}
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index += 1
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var expression = ""
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while index < characters.count, characters[index] != "}" {
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expression.append(characters[index])
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index += 1
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}
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index += 1
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parts.append(.expression(expression))
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continue
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}
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literal.append(character)
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index += 1
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}
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if !literal.isEmpty { parts.append(.literal(literal)) }
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return parts
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}
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}
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