Archived
383 lines
49 KiB
Swift
383 lines
49 KiB
Swift
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//
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// Entities.swift
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// SwifSoup
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//
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// Created by Nabil Chatbi on 29/09/16.
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// Copyright © 2016 Nabil Chatbi.. All rights reserved.
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//
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import Foundation
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/**
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* HTML entities, and escape routines.
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* Source: <a href="http://www.w3.org/TR/html5/named-character-references.html#named-character-references">W3C HTML
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* named character references</a>.
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*/
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public class Entities {
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private static let empty = -1
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private static let emptyName = ""
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private static let codepointRadix: Int = 36
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public struct EscapeMode: Equatable {
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/** Restricted entities suitable for XHTML output: lt, gt, amp, and quot only. */
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public static let xhtml: EscapeMode = EscapeMode(string: Entities.xhtml, size: 4, id: 0)
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/** Default HTML output entities. */
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public static let base: EscapeMode = EscapeMode(string: Entities.base, size: 106, id: 1)
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/** Complete HTML entities. */
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public static let extended: EscapeMode = EscapeMode(string: Entities.full, size: 2125, id: 2)
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fileprivate let value: Int
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// table of named references to their codepoints. sorted so we can binary search. built by BuildEntities.
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fileprivate var nameKeys: [String]
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fileprivate var codeVals: [Int] // limitation is the few references with multiple characters; those go into multipoints.
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// table of codepoints to named entities.
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fileprivate var codeKeys: [Int] // we don' support multicodepoints to single named value currently
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fileprivate var nameVals: [String]
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public static func == (left: EscapeMode, right: EscapeMode) -> Bool {
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return left.value == right.value
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}
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static func != (left: EscapeMode, right: EscapeMode) -> Bool {
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return left.value != right.value
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}
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private static let codeDelims: [UnicodeScalar] = [",", ";"]
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init(string: String, size: Int, id: Int) {
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nameKeys = [String](repeating: "", count: size)
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codeVals = [Int](repeating: 0, count: size)
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codeKeys = [Int](repeating: 0, count: size)
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nameVals = [String](repeating: "", count: size)
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value = id
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//Load()
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var i = 0
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let reader: CharacterReader = CharacterReader(string)
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while (!reader.isEmpty()) {
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// NotNestedLessLess=10913,824;1887
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let name: String = reader.consumeTo("=")
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reader.advance()
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let cp1: Int = Int(reader.consumeToAny(EscapeMode.codeDelims), radix: codepointRadix) ?? 0
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let codeDelim: UnicodeScalar = reader.current()
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reader.advance()
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let cp2: Int
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if (codeDelim == ",") {
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cp2 = Int(reader.consumeTo(";"), radix: codepointRadix) ?? 0
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reader.advance()
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} else {
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cp2 = empty
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}
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let index: Int = Int(reader.consumeTo("\n"), radix: codepointRadix) ?? 0
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reader.advance()
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nameKeys[i] = name
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codeVals[i] = cp1
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codeKeys[index] = cp1
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nameVals[index] = name
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if (cp2 != empty) {
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var s = String()
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s.append(Character(UnicodeScalar(cp1)!))
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s.append(Character(UnicodeScalar(cp2)!))
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multipoints[name] = s
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}
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i = i + 1
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}
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}
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// init(string: String, size: Int, id: Int) {
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// nameKeys = [String](repeating: "", count: size)
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// codeVals = [Int](repeating: 0, count: size)
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// codeKeys = [Int](repeating: 0, count: size)
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// nameVals = [String](repeating: "", count: size)
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// value = id
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//
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// let components = string.components(separatedBy: "\n")
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//
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// var i = 0
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// for entry in components {
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// let match = Entities.entityPattern.matcher(in: entry)
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// if (match.find()) {
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// let name = match.group(1)!
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// let cp1 = Int(match.group(2)!, radix: codepointRadix)
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// //let cp2 = Int(Int.parseInt(s: match.group(3), radix: codepointRadix))
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// let cp2 = match.group(3) != nil ? Int(match.group(3)!, radix: codepointRadix) : empty
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// let index = Int(match.group(4)!, radix: codepointRadix)
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//
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// nameKeys[i] = name
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// codeVals[i] = cp1!
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// codeKeys[index!] = cp1!
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// nameVals[index!] = name
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//
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// if (cp2 != empty) {
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// var s = String()
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// s.append(Character(UnicodeScalar(cp1!)!))
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// s.append(Character(UnicodeScalar(cp2!)!))
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// multipoints[name] = s
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// }
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// i += 1
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// }
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// }
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// }
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public func codepointForName(_ name: String) -> Int {
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// for s in nameKeys {
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// if s == name {
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// return codeVals[nameKeys.index(of: s)!]
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// }
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// }
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guard let index = nameKeys.index(of: name) else {
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return empty
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}
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return codeVals[index]
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}
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public func nameForCodepoint(_ codepoint: Int ) -> String {
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//let ss = codeKeys.index(of: codepoint)
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var index = -1
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for s in codeKeys {
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if s == codepoint {
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index = codeKeys.index(of: codepoint)!
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}
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}
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if (index >= 0) {
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// the results are ordered so lower case versions of same codepoint come after uppercase, and we prefer to emit lower
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// (and binary search for same item with multi results is undefined
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return (index < nameVals.count-1 && codeKeys[index+1] == codepoint) ?
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nameVals[index+1] : nameVals[index]
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}
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return emptyName
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}
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private func size() -> Int {
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return nameKeys.count
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}
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}
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private static var multipoints: Dictionary<String, String> = Dictionary<String, String>() // name -> multiple character references
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private init() {
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}
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/**
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* Check if the input is a known named entity
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* @param name the possible entity name (e.g. "lt" or "amp")
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* @return true if a known named entity
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*/
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public static func isNamedEntity(_ name: String ) -> Bool {
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return (EscapeMode.extended.codepointForName(name) != empty)
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}
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/**
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* Check if the input is a known named entity in the base entity set.
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* @param name the possible entity name (e.g. "lt" or "amp")
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* @return true if a known named entity in the base set
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* @see #isNamedEntity(String)
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*/
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public static func isBaseNamedEntity(_ name: String) -> Bool {
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return EscapeMode.base.codepointForName(name) != empty
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}
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/**
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* Get the Character value of the named entity
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* @param name named entity (e.g. "lt" or "amp")
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* @return the Character value of the named entity (e.g. '{@literal <}' or '{@literal &}')
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* @deprecated does not support characters outside the BMP or multiple character names
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*/
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public static func getCharacterByName(name: String) -> Character {
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return Character.convertFromIntegerLiteral(value: EscapeMode.extended.codepointForName(name))
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}
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/**
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* Get the character(s) represented by the named entitiy
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* @param name entity (e.g. "lt" or "amp")
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* @return the string value of the character(s) represented by this entity, or "" if not defined
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*/
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public static func getByName(name: String) -> String {
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let val = multipoints[name]
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if (val != nil) {return val!}
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let codepoint = EscapeMode.extended.codepointForName(name)
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if (codepoint != empty) {
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return String(Character(UnicodeScalar(codepoint)!))
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}
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return emptyName
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}
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public static func codepointsForName(_ name: String, codepoints: inout [UnicodeScalar]) -> Int {
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if let val: String = multipoints[name] {
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codepoints[0] = val.unicodeScalar(0)
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codepoints[1] = val.unicodeScalar(1)
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return 2
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}
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let codepoint = EscapeMode.extended.codepointForName(name)
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if (codepoint != empty) {
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codepoints[0] = UnicodeScalar(codepoint)!
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return 1
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}
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return 0
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}
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public static func escape(_ string: String, _ encode: String.Encoding = .utf8 ) -> String {
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return Entities.escape(string, OutputSettings().charset(encode).escapeMode(Entities.EscapeMode.extended))
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}
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public static func escape(_ string: String, _ out: OutputSettings) -> String {
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let accum = StringBuilder()//string.characters.count * 2
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escape(accum, string, out, false, false, false)
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// try {
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//
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// } catch (IOException e) {
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// throw new SerializationException(e) // doesn't happen
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// }
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return accum.toString()
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}
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// this method is ugly, and does a lot. but other breakups cause rescanning and stringbuilder generations
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static func escape(_ accum: StringBuilder, _ string: String, _ out: OutputSettings, _ inAttribute: Bool, _ normaliseWhite: Bool, _ stripLeadingWhite: Bool ) {
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var lastWasWhite = false
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var reachedNonWhite = false
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let escapeMode: EscapeMode = out.escapeMode()
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let encoder: String.Encoding = out.encoder()
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//let length = UInt32(string.characters.count)
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var codePoint: UnicodeScalar
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for ch in string.unicodeScalars {
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codePoint = ch
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if (normaliseWhite) {
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if (codePoint.isWhitespace) {
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if ((stripLeadingWhite && !reachedNonWhite) || lastWasWhite) {
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continue
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}
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accum.append(UnicodeScalar.Space)
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lastWasWhite = true
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continue
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} else {
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lastWasWhite = false
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reachedNonWhite = true
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}
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}
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// surrogate pairs, split implementation for efficiency on single char common case (saves creating strings, char[]):
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if (codePoint.value < Character.MIN_SUPPLEMENTARY_CODE_POINT) {
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let c = codePoint
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// html specific and required escapes:
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switch (codePoint) {
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case UnicodeScalar.Ampersand:
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accum.append("&")
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break
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case UnicodeScalar(UInt32(0xA0))!:
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if (escapeMode != EscapeMode.xhtml) {
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accum.append(" ")
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} else {
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accum.append(" ")
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}
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break
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case UnicodeScalar.LessThan:
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// escape when in character data or when in a xml attribue val; not needed in html attr val
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if (!inAttribute || escapeMode == EscapeMode.xhtml) {
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accum.append("<")
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} else {
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accum.append(c)
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}
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break
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case UnicodeScalar.GreaterThan:
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if (!inAttribute) {
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accum.append(">")
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} else {
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accum.append(c)}
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break
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case "\"":
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if (inAttribute) {
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accum.append(""")
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} else {
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accum.append(c)
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}
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break
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default:
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if (canEncode(c, encoder)) {
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accum.append(c)
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} else {
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appendEncoded(accum: accum, escapeMode: escapeMode, codePoint: codePoint)
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}
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}
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} else {
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if (encoder.canEncode(String(codePoint))) // uses fallback encoder for simplicity
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{
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accum.append(String(codePoint))
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} else {
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appendEncoded(accum: accum, escapeMode: escapeMode, codePoint: codePoint)
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}
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}
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}
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}
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private static func appendEncoded(accum: StringBuilder, escapeMode: EscapeMode, codePoint: UnicodeScalar) {
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let name = escapeMode.nameForCodepoint(Int(codePoint.value))
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if (name != emptyName) // ok for identity check
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{accum.append(UnicodeScalar.Ampersand).append(name).append(";")
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} else {
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accum.append("&#x").append(String.toHexString(n: Int(codePoint.value)) ).append(";")
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}
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}
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public static func unescape(_ string: String)throws-> String {
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return try unescape(string: string, strict: false)
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}
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/**
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* Unescape the input string.
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* @param string to un-HTML-escape
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* @param strict if "strict" (that is, requires trailing ';' char, otherwise that's optional)
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* @return unescaped string
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*/
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public static func unescape(string: String, strict: Bool)throws -> String {
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return try Parser.unescapeEntities(string, strict)
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}
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/*
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* Provides a fast-path for Encoder.canEncode, which drastically improves performance on Android post JellyBean.
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* After KitKat, the implementation of canEncode degrades to the point of being useless. For non ASCII or UTF,
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* performance may be bad. We can add more encoders for common character sets that are impacted by performance
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* issues on Android if required.
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*
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* Benchmarks: *
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* OLD toHtml() impl v New (fastpath) in millis
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* Wiki: 1895, 16
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* CNN: 6378, 55
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* Alterslash: 3013, 28
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* Jsoup: 167, 2
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*/
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private static func canEncode(_ c: UnicodeScalar, _ fallback: String.Encoding) -> Bool {
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// todo add more charset tests if impacted by Android's bad perf in canEncode
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switch (fallback) {
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case String.Encoding.ascii:
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return c.value < 0x80
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case String.Encoding.utf8:
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return true // real is:!(Character.isLowSurrogate(c) || Character.isHighSurrogate(c)) - but already check above
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default:
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return fallback.canEncode(String(Character(c)))
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}
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}
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static let xhtml: String = "amp=12;1\ngt=1q;3\nlt=1o;2\nquot=y;0"
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static let base: String = "AElig=5i;1c\nAMP=12;2\nAacute=5d;17\nAcirc=5e;18\nAgrave=5c;16\nAring=5h;1b\nAtilde=5f;19\nAuml=5g;1a\nCOPY=4p;h\nCcedil=5j;1d\nETH=5s;1m\nEacute=5l;1f\nEcirc=5m;1g\nEgrave=5k;1e\nEuml=5n;1h\nGT=1q;6\nIacute=5p;1j\nIcirc=5q;1k\nIgrave=5o;1i\nIuml=5r;1l\nLT=1o;4\nNtilde=5t;1n\nOacute=5v;1p\nOcirc=5w;1q\nOgrave=5u;1o\nOslash=60;1u\nOtilde=5x;1r\nOuml=5y;1s\nQUOT=y;0\nREG=4u;n\nTHORN=66;20\nUacute=62;1w\nUcirc=63;1x\nUgrave=61;1v\nUuml=64;1y\nYacute=65;1z\naacute=69;23\nacirc=6a;24\nacute=50;u\naelig=6e;28\nagrave=68;22\namp=12;3\naring=6d;27\natilde=6b;25\nauml=6c;26\nbrvbar=4m;e\nccedil=6f;29\ncedil=54;y\ncent=4i;a\ncopy=4p;i\ncurren=4k;c\ndeg=4w;q\ndivide=6v;2p\neacute=6h;2b\necirc=6i;2c\negrave=6g;2a\neth=6o;2i\neuml=6j;2d\nfrac12=59;13\nfrac14=58;12\nfrac34=5a;14\ngt=1q;7\niacute=6l;2f\nicirc=6m;2g\niexcl=4h;9\nigrave=6k;2e\niquest=5b;15\niuml=6n;2h\nlaquo=4r;k\nlt=1o;5\nmacr=4v;p\nmicro=51;v\nmiddot=53;x\nnbsp=4g;8\nnot=4s;l\nntilde=6p;2j\noacute=6r;2l\nocirc=6s;2m\nograve=6q;2k\nordf=4q;j\nordm=56;10\noslash=6w;2q\notilde=6t;2n\nouml=6u;2o\npara=52;w\nplusmn=4x;r\npound=4j;b\nquot=y;1\nraquo=57;11\nreg=4u;o\nsect=4n;f\nshy=4t;m\nsup1=55;z\nsup2=4y;s\nsup3=4z;t\nszlig=67;21\nthorn=72;2w\ntimes=5z;1t\nuacute=6y;2s\nucirc=6z;2t\nugrave=6x;2r\numl=4o;g\nuuml=70;2u\nyacute=71;2v\nyen=4l;d\nyuml=73;2x"
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static let full: String = "AElig=5i;2v\nAMP=12;8\nAacute=5d;2p\nAbreve=76;4k\nAcirc=5e;2q\nAcy=sw;av\nAfr=2kn8;1kh\nAgrave=5c;2o\nAlpha=pd;8d\nAmacr=74;4i\nAnd=8cz;1e1\nAogon=78;4m\nAopf=2koo;1ls\nApplyFunction=6e9;ew\nAring=5h;2t\nAscr=2kkc;1jc\nAssign=6s4;s6\nAtilde=5f;2r\nAuml=5g;2s\nBackslash=6qe;o1\nBarv=8h3;1it\nBarwed=6x2;120\nBcy=sx;aw\nBecause=6r9;pw\nBernoullis=6jw;gn\nBeta=pe;8e\nBfr=2kn9;1ki\nBopf=2kop;1lt\nBreve=k8;82\nBscr=6jw;gp\nBumpeq=6ry;ro\nCHcy=tj;bi\nCOPY=4p;1q\nCacute=7a;4o\nCap=6vm;zz\nCapitalDifferentialD=6kl;h8\nCayleys=6jx;gq\nCcaron=7g;4u\nCcedil=5j;2w\nCcirc=7c;4q\nCconint=6r4;pn\nCdot=7e;4s\nCedilla=54;2e\nCenterDot=53;2b\nCfr=6jx;gr\nChi=pz;8y\nCircleDot=6u1;x8\nCircleMinus=6ty;x3\nCirclePlus=6tx;x1\nCircleTimes=6tz;x5\nClockwiseContourIntegral=6r6;pp\nCloseCurlyDoubleQuote=6cd;e0\nCloseCurlyQuote=6c9;dt\nColon=6rb;q1\nColone=8dw;1en\nCongruent=6sh;sn\nConint=6r3;pm\nContourIntegral=6r2;pi\nCopf=6iq;f7\nCoproduct=6q8;nq\nCounterClockwiseContourIntegral=6r7;pr\nCross=8bz;1d8\nCscr=2kke;1jd\nCup=6vn;100\nCupCap=6rx;rk\nDD=6kl;h9\nDDotrahd=841;184\nDJcy=si;ai\nDScy=sl;al\nDZcy=sv;au\nDagger=6ch;e7\nDarr=6n5;j5\nDashv=8h0;1ir\nDcaron=7i;4w\nDcy=t0;az\nDel=6pz;n9\nDelta=pg;8g\nDfr=2knb;1kj\nDiacriticalAcute=50;27\nDiacriticalDot=k9;84\nDiacriticalDoubleAcute=kd;8a\nDiacriticalGrave=2o;13\nDiacriticalTilde=kc;88\nDiamond=6v8;za\nDifferentialD=6km;ha\nDopf=2kor;1lu\nDot=4o;1n\nDotDot=6ho;f5\nDotEqual=6s0;rw\nDoubleContourIntegral=6r3;pl\nDoubleDot=4o;1m\nDoubleDownArrow=6oj;m0\nDoubleLeftArrow=6og;lq\nDoubleLeftRightArrow=6ok;m3\nDoubleLeftTee=8h0;1iq\nDoubleLongLeftArrow=7w8;17g\nDoubleLongLeftRightArrow=7wa;17m\nDoubleLongRightArrow=7w9;17j\nDoubleRightArrow=6oi;lw\nDoubleRightTee=6ug;xz\nDoubleUpArrow=6oh;lt\nDoubleUpDownArrow=6ol;m7\nDoubleVerticalBar=6qt;ov\nDownArrow=6mr;i8\nDownArrowBar=843;186\nDownArrowUpArrow=6ph;mn\nDownBreve=lt;8c\nDownLeftRightVector=85s;198\nDownLeftTeeVector=866;19m\nDownLeftVector=6nx;ke\nDownLeftVectorBar=85y;19e\nDownRightTeeVector=867;19n\nDownRightVector=6o1;kq\nDownRightVectorBar=85z;19f\nDownTee=6uc;xs\nDownTeeArrow=6nb;jh\nDownarrow=6oj;m1\nDscr=2kkf;1je\nDstrok=7k;4y\nENG=96;6g\nETH=5s;35\nEacute=5l;2y\nEcaron=7u;56\nEcirc=5m;2z\nEcy=tp;bo\nEdot=7q;52\nEfr=2knc;1kk\nEgrave=5k;2x\nElement=6q0;na\nEmacr=7m;50\nEmptySmallSquare=7i3;15x\nEmptyVerySmallSquare=7fv;150\nEogon=7s;54\nEopf=2kos;1lv\nEpsilon=ph;8h\nEqual=8dx;1eo\nEqualTilde=6rm;qp\nEquilibrium=6oc;li\nEscr=6k0;gu\nEsim=8dv;1em\nEta=pj;8j\nEuml=5n;30\nExists=6pv;mz\nExponentialE=6kn;hc\nFcy=tg;bf\nFfr=2knd;1kl\nFilledSmallSquare=7i4;15y\nFilledVerySmallSquare=7fu;14w\nFopf=2kot;1lw\nForAll=6ps;ms\nFouriertrf=6k1;gv\nFscr=6k1;gw\nGJcy=sj;aj\nGT=1q;r\nGamma=pf;8f\nGammad=rg;a5\nGbreve=7y;5a\nGcedil=82;5e\nGcirc=7w;58\nGcy=sz;ay\nGdot=80;5c\nGfr=2kne;1km\nGg=6vt;10c\nGopf=2kou;1lx\nGreaterEqual=6sl;sv\nGreaterEqualLess=6vv;10i\nGreaterFullEqual=6sn;t6\nGreaterGreater=8f6;1gh\nGreaterLess=6t3;ul\nGreaterSlantEqual=8e6;1f5\nGreaterTilde=6sz;ub\nGscr=2kki;1jf\nGt=6sr;tr\nHARDcy=tm;bl\nHacek=jr;80\nHat=2m;10\nHcirc=84;5f\nHfr=6j0;fe\nHilbertSpace=6iz;fa\nHopf=6j1;fg\nHorizontalLine=7b4;13i\nHscr=6iz;fc\nHstrok=86;5h\nHumpDownHump=6ry;rn\nHumpEqual=6rz;rs\nIEcy=t1;b0\nIJlig=8i;5s\nIOcy=sh;ah\nIacute=5p;32\nIcirc=5q;33\nIcy=t4;b3\nIdot=8g;5p\nIfr=6j5;fq\nIgrave=5o;31\nIm=6j5;fr\nImacr=8a;5l\nImaginaryI=6ko;hf\nImplies=6oi;ly\nInt=6r0;pf\nIntegral=6qz;pd\nIntersection=6v6;z4\nInvisibleComma=6eb;f0\nInvisibleTimes=6ea;ey\nIogon=8e;5n\nIopf=2kow;1ly\nIota=pl;8l\nIscr=6j4;fn\nItilde=88;5j\nIukcy=sm;am\nIuml=5r;34\nJcirc=8k;5u\nJcy=t5;b4\nJfr=2knh;1kn\nJopf=2kox;1lz\nJscr=2kkl;1jg\nJsercy=so;ao\nJukcy=sk;ak\nKHcy=th;bg\nKJcy=ss;as\nKappa=pm;8m\nKcedil=8m;5w\nKcy=t6;b5\nKfr=2kni;1ko\nKopf=2koy;1m0\nKscr=2kkm;1jh\nLJcy=sp;ap\nLT=1o;m\nLacute=8p;5z\nLambda=pn;8n\nLang=7vu;173\nLaplacetrf=6j6;fs\nLarr=6n2;j1\nLcaron=8t;63\nLcedil=8r;61\nLcy=t7;b6\nLeftAngleBracket=7vs;16x\nLeftArrow=6mo;hu\nLeftArrowBar=6p0;mj\nLeftArrowRightArrow=6o6;l3\nLeftCeiling=6x4;121\nLeftDoubleBracket=7vq;16t\nLeftDownTeeVector=869;19p\nLe
|
||
|
|
|
||
|
|
}
|