Mihaela Mihaljevic
9b55767b39
Add PureXML.Emitting.Writer, the libxml2 xmlTextWriter model: emit a document with writeStartElement/writeAttribute/writeString/writeEndElement and friends, never building a tree. Escaping is extracted into a shared Emitting.Escaping helper used by both the writer and the serializer, so compact writer output is byte-identical to serializing the equivalent tree. Pretty mode indents element children (forward-only, so prefer compact for mixed content). Closes #32. Reimplemented from the libxml2 model; no upstream code copied. 6 tests; 90 total.
39 lines
1.4 KiB
Swift
39 lines
1.4 KiB
Swift
extension PureXML.Emitting {
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/// The shared XML output escaping rules, used by both the tree serializer and
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/// the incremental writer so their output is identical. Element content
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/// escapes the markup characters; attribute values additionally escape the
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/// quote and the whitespace characters as numeric references (matching
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/// libxml2), so attributes survive attribute-value normalization.
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enum Escaping {
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static func text(_ value: String) -> String {
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var result = ""
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for character in value {
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switch character {
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case "&": result += "&"
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case "<": result += "<"
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case ">": result += ">"
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default: result.append(character)
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}
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}
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return result
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}
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static func attribute(_ value: String) -> String {
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var result = ""
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for character in value {
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switch character {
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case "&": result += "&"
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case "<": result += "<"
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case ">": result += ">"
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case "\"": result += """
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case "\t": result += "	"
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case "\n": result += " "
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case "\r": result += " "
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default: result.append(character)
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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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}
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