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119 lines
2.5 KiB
Swift
119 lines
2.5 KiB
Swift
//
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// OPMLParser.swift
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//
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//
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// Created by Brent Simmons on 8/18/24.
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//
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import Foundation
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import SAX
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public final class OPMLParser {
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private let parserData: ParserData
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private var data: Data {
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parserData.data
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}
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private var opmlDocument: OPMLDocument?
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private var itemStack = [OPMLItem]()
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private var currentItem: OPMLItem? {
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itemStack.last
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}
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struct XMLKey {
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static let title = "title".utf8CString
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static let outline = "outline".utf8CString
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}
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/// Returns nil if data can’t be parsed (if it’s not OPML).
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public static func document(with parserData: ParserData) -> OPMLDocument? {
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let opmlParser = OPMLParser(parserData)
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opmlParser.parse()
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return opmlParser.opmlDocument
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}
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init(_ parserData: ParserData) {
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self.parserData = parserData
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}
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}
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private extension OPMLParser {
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func parse() {
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guard canParseData() else {
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return
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}
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opmlDocument = OPMLDocument(url: parserData.url)
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push(opmlDocument!)
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let saxParser = SAXParser(delegate: self, data: data)
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saxParser.parse()
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}
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func canParseData() -> Bool {
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data.containsASCIIString("<opml")
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}
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func push(_ item: OPMLItem) {
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itemStack.append(item)
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}
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func popItem() {
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guard itemStack.count > 0 else {
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assertionFailure("itemStack.count must be > 0")
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return
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}
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_ = itemStack.dropLast()
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}
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}
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extension OPMLParser: SAXParserDelegate {
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public func saxParser(_ saxParser: SAXParser, xmlStartElement localName: XMLPointer, prefix: XMLPointer?, uri: XMLPointer?, namespaceCount: Int, namespaces: UnsafePointer<XMLPointer?>?, attributeCount: Int, attributesDefaultedCount: Int, attributes: UnsafePointer<XMLPointer?>?) {
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if SAXEqualTags(localName, XMLKey.title) {
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saxParser.beginStoringCharacters()
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return
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}
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if !SAXEqualTags(localName, XMLKey.outline) {
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return
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}
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let attributesDictionary = saxParser.attributesDictionary(attributes, attributeCount: attributeCount)
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let item = OPMLItem(attributes: attributesDictionary)
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currentItem?.add(item)
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push(item)
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}
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public func saxParser(_ saxParser: SAXParser, xmlEndElement localName: XMLPointer, prefix: XMLPointer?, uri: XMLPointer?) {
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if SAXEqualTags(localName, XMLKey.title) {
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if let item = currentItem as? OPMLDocument {
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item.title = saxParser.currentStringWithTrimmedWhitespace
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}
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return
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}
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if SAXEqualTags(localName, XMLKey.outline) {
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popItem()
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}
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}
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public func saxParser(_: SAXParser, xmlCharactersFound: XMLPointer, count: Int) {
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// Nothing to do, but method is required.
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}
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}
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