A small menubar app that allows you to switch between R versions quickly (if you have multiple versions of R framework installed). https://rud.is/rswitch
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//
// Parser.swift
// SwifSoup
//
// Created by Nabil Chatbi on 29/09/16.
// Copyright © 2016 Nabil Chatbi.. All rights reserved.
//
import Foundation
/**
* Parses HTML into a {@link org.jsoup.nodes.Document}. Generally best to use one of the more convenient parse methods
* in {@link org.jsoup.Jsoup}.
*/
public class Parser {
private static let DEFAULT_MAX_ERRORS: Int = 0 // by default, error tracking is disabled.
private var _treeBuilder: TreeBuilder
private var _maxErrors: Int = DEFAULT_MAX_ERRORS
private var _errors: ParseErrorList = ParseErrorList(16, 16)
private var _settings: ParseSettings
/**
* Create a new Parser, using the specified TreeBuilder
* @param treeBuilder TreeBuilder to use to parse input into Documents.
*/
init(_ treeBuilder: TreeBuilder) {
self._treeBuilder = treeBuilder
_settings = treeBuilder.defaultSettings()
}
public func parseInput(_ html: String, _ baseUri: String)throws->Document {
_errors = isTrackErrors() ? ParseErrorList.tracking(_maxErrors) : ParseErrorList.noTracking()
return try _treeBuilder.parse(html, baseUri, _errors, _settings)
}
// gets & sets
/**
* Get the TreeBuilder currently in use.
* @return current TreeBuilder.
*/
public func getTreeBuilder() -> TreeBuilder {
return _treeBuilder
}
/**
* Update the TreeBuilder used when parsing content.
* @param treeBuilder current TreeBuilder
* @return this, for chaining
*/
@discardableResult
public func setTreeBuilder(_ treeBuilder: TreeBuilder) -> Parser {
self._treeBuilder = treeBuilder
return self
}
/**
* Check if parse error tracking is enabled.
* @return current track error state.
*/
public func isTrackErrors() -> Bool {
return _maxErrors > 0
}
/**
* Enable or disable parse error tracking for the next parse.
* @param maxErrors the maximum number of errors to track. Set to 0 to disable.
* @return this, for chaining
*/
@discardableResult
public func setTrackErrors(_ maxErrors: Int) -> Parser {
self._maxErrors = maxErrors
return self
}
/**
* Retrieve the parse errors, if any, from the last parse.
* @return list of parse errors, up to the size of the maximum errors tracked.
*/
public func getErrors() -> ParseErrorList {
return _errors
}
@discardableResult
public func settings(_ settings: ParseSettings) -> Parser {
self._settings = settings
return self
}
public func settings() -> ParseSettings {
return _settings
}
// static parse functions below
/**
* Parse HTML into a Document.
*
* @param html HTML to parse
* @param baseUri base URI of document (i.e. original fetch location), for resolving relative URLs.
*
* @return parsed Document
*/
public static func parse(_ html: String, _ baseUri: String)throws->Document {
let treeBuilder: TreeBuilder = HtmlTreeBuilder()
return try treeBuilder.parse(html, baseUri, ParseErrorList.noTracking(), treeBuilder.defaultSettings())
}
/**
* Parse a fragment of HTML into a list of nodes. The context element, if supplied, supplies parsing context.
*
* @param fragmentHtml the fragment of HTML to parse
* @param context (optional) the element that this HTML fragment is being parsed for (i.e. for inner HTML). This
* provides stack context (for implicit element creation).
* @param baseUri base URI of document (i.e. original fetch location), for resolving relative URLs.
*
* @return list of nodes parsed from the input HTML. Note that the context element, if supplied, is not modified.
*/
public static func parseFragment(_ fragmentHtml: String, _ context: Element?, _ baseUri: String)throws->Array<Node> {
let treeBuilder = HtmlTreeBuilder()
return try treeBuilder.parseFragment(fragmentHtml, context, baseUri, ParseErrorList.noTracking(), treeBuilder.defaultSettings())
}
/**
* Parse a fragment of XML into a list of nodes.
*
* @param fragmentXml the fragment of XML to parse
* @param baseUri base URI of document (i.e. original fetch location), for resolving relative URLs.
* @return list of nodes parsed from the input XML.
*/
public static func parseXmlFragment(_ fragmentXml: String, _ baseUri: String)throws->Array<Node> {
let treeBuilder: XmlTreeBuilder = XmlTreeBuilder()
return try treeBuilder.parseFragment(fragmentXml, baseUri, ParseErrorList.noTracking(), treeBuilder.defaultSettings())
}
/**
* Parse a fragment of HTML into the {@code body} of a Document.
*
* @param bodyHtml fragment of HTML
* @param baseUri base URI of document (i.e. original fetch location), for resolving relative URLs.
*
* @return Document, with empty head, and HTML parsed into body
*/
public static func parseBodyFragment(_ bodyHtml: String, _ baseUri: String)throws->Document {
let doc: Document = Document.createShell(baseUri)
if let body: Element = doc.body() {
let nodeList: Array<Node> = try parseFragment(bodyHtml, body, baseUri)
//var nodes: [Node] = nodeList.toArray(Node[nodeList.size()]) // the node list gets modified when re-parented
if nodeList.count > 0 {
for i in 1..<nodeList.count {
try nodeList[i].remove()
}
}
for node: Node in nodeList {
try body.appendChild(node)
}
}
return doc
}
/**
* Utility method to unescape HTML entities from a string
* @param string HTML escaped string
* @param inAttribute if the string is to be escaped in strict mode (as attributes are)
* @return an unescaped string
*/
public static func unescapeEntities(_ string: String, _ inAttribute: Bool)throws->String {
let tokeniser: Tokeniser = Tokeniser(CharacterReader(string), ParseErrorList.noTracking())
return try tokeniser.unescapeEntities(inAttribute)
}
/**
* @param bodyHtml HTML to parse
* @param baseUri baseUri base URI of document (i.e. original fetch location), for resolving relative URLs.
*
* @return parsed Document
* @deprecated Use {@link #parseBodyFragment} or {@link #parseFragment} instead.
*/
public static func parseBodyFragmentRelaxed(_ bodyHtml: String, _ baseUri: String)throws->Document {
return try parse(bodyHtml, baseUri)
}
// builders
/**
* Create a new HTML parser. This parser treats input as HTML5, and enforces the creation of a normalised document,
* based on a knowledge of the semantics of the incoming tags.
* @return a new HTML parser.
*/
public static func htmlParser() -> Parser {
return Parser(HtmlTreeBuilder())
}
/**
* Create a new XML parser. This parser assumes no knowledge of the incoming tags and does not treat it as HTML,
* rather creates a simple tree directly from the input.
* @return a new simple XML parser.
*/
public static func xmlParser() -> Parser {
return Parser(XmlTreeBuilder())
}
}