Mihaela Mihaljevic
2f86b326cc
Use let for never-mutated bindings in DateTimeParser, HTMLEntities, and the XSLT parser, and drop the redundant Unicode.Scalar Comparable conformance that the standard library already provides. No behavior change.
55 lines
2.1 KiB
Swift
55 lines
2.1 KiB
Swift
extension PureXML.HTML.Tokenizer {
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private static let named: [String: Character] = [
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"amp": "&", "lt": "<", "gt": ">", "quot": "\"", "apos": "'",
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"nbsp": "\u{A0}", "copy": "\u{A9}", "reg": "\u{AE}", "trade": "\u{2122}",
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"mdash": "\u{2014}", "ndash": "\u{2013}", "hellip": "\u{2026}",
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"laquo": "\u{AB}", "raquo": "\u{BB}", "deg": "\u{B0}", "euro": "\u{20AC}",
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]
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/// Decodes the common HTML character references in `value`, leaving any
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/// unrecognized `&...;` sequence as written (the lenient HTML behavior).
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static func decodeEntities(_ value: String) -> String {
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guard value.contains("&") else { return value }
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var result = ""
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let characters = Array(value)
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var index = 0
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while index < characters.count {
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guard characters[index] == "&", let semicolon = nextSemicolon(characters, after: index) else {
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result.append(characters[index])
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index += 1
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continue
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}
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let body = String(characters[(index + 1) ..< semicolon])
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if let decoded = decode(body) {
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result.append(decoded)
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index = semicolon + 1
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} else {
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result.append("&")
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index += 1
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}
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}
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return result
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}
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private static func nextSemicolon(_ characters: [Character], after start: Int) -> Int? {
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var index = start + 1
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while index < characters.count, index - start <= 10 {
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if characters[index] == ";" { return index }
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index += 1
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}
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return nil
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}
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private static func decode(_ body: String) -> Character? {
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if let named = named[body] { return named }
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guard body.hasPrefix("#") else { return nil }
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let digits = body.dropFirst()
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let scalar: UInt32? = if digits.hasPrefix("x") || digits.hasPrefix("X") {
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UInt32(digits.dropFirst(), radix: 16)
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} else {
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UInt32(digits, radix: 10)
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}
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return scalar.flatMap(Unicode.Scalar.init).map(Character.init)
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}
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}
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