Mihaela Mihaljevic
367b5b9425
xsl:message instantiates its body as diagnostic text and produces no result-tree output; terminate=yes records the text and aborts the transform with an XSLTError.terminated, halting further instantiation. Splits the transform entry points into XSLTTransform.swift and moves the message case to keep within the complexity and file-length budgets.
49 lines
2.4 KiB
Swift
49 lines
2.4 KiB
Swift
public extension PureXML.XSLT {
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/// Transforms `source` with `stylesheet`, returning the serialized result.
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/// `documentLoader` resolves the URI argument of the `document()` function to
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/// source text; it returns `nil` (the default) when external documents are
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/// not available, which keeps `document()` from reaching the filesystem or
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/// network by default.
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static func transform(
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stylesheet: String,
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source: String,
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options: PureXML.Emitting.Options = .compact,
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documentLoader: @escaping (String) -> String? = { _ in nil },
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) throws -> String {
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let sheet = try XSLTParser.parse(stylesheet, loader: documentLoader)
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let root = try PureXML.parseTree(source)
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Whitespace.strip(root, stylesheet: sheet)
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let transformer = Transformer(stylesheet: sheet, root: root, documentLoader: documentLoader)
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let result = transformer.run()
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if let message = transformer.terminationMessage { throw XSLTError.terminated(message) }
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if sheet.output.method == "text" { return textValue(of: result) }
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return PureXML.serialize(result, options: options.applying(sheet.output))
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}
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/// Transforms `source` with `stylesheet`, returning the result tree.
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static func transformToNode(
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stylesheet: String,
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source: String,
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documentLoader: @escaping (String) -> String? = { _ in nil },
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) throws -> PureXML.Model.Node {
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let sheet = try XSLTParser.parse(stylesheet, loader: documentLoader)
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let root = try PureXML.parseTree(source)
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Whitespace.strip(root, stylesheet: sheet)
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let transformer = Transformer(stylesheet: sheet, root: root, documentLoader: documentLoader)
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let result = transformer.run()
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if let message = transformer.terminationMessage { throw XSLTError.terminated(message) }
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return result
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}
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/// The concatenated text content of a result tree, for the `text` output
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/// method: character data only, with markup, comments, and PIs dropped.
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private static func textValue(of node: PureXML.Model.Node) -> String {
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switch node {
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case let .text(value), let .cdata(value): value
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case let .document(children): children.map(textValue).joined()
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case let .element(element): element.children.map(textValue).joined()
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case .comment, .processingInstruction: ""
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}
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}
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}
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