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XMLElement.swift
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XMLElement.swift
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//
// XMLElement.swift
// XMLCoder
//
// Created by Vincent Esche on 12/18/18.
//
import Foundation
struct _XMLElement {
static let attributesKey = "___ATTRIBUTES"
static let escapedCharacterSet = [("&", "&"), ("<", "<"), (">", ">"), ("'", "'"), ("\"", """)]
var key: String
var value: String?
var attributes: [String: String] = [:]
var elements: [String: [_XMLElement]] = [:]
init(key: String, value: String? = nil, attributes: [String: String] = [:], elements: [String: [_XMLElement]] = [:]) {
self.key = key
self.value = value
self.attributes = attributes
self.elements = elements
}
init(key: String, box: UnkeyedBox) {
self.init(key: key)
elements[key] = box.map { box in
_XMLElement(key: key, box: box)
}
}
init(key: String, box: KeyedBox) {
self.init(key: key)
attributes = Dictionary(uniqueKeysWithValues: box.attributes.compactMap { key, box in
guard let value = box.xmlString() else {
return nil
}
return (key, value)
})
elements = Dictionary(uniqueKeysWithValues: box.elements.map { key, box in
switch box {
case let unkeyedBox as UnkeyedBox:
// This basically injects the unkeyed children directly into self:
let elements = unkeyedBox.map { _XMLElement(key: key, box: $0) }
return (key, elements)
case let keyedBox as KeyedBox:
let elements = [_XMLElement(key: key, box: keyedBox)]
return (key, elements)
case let simpleBox as SimpleBox:
let elements = [_XMLElement(key: key, box: simpleBox)]
return (key, elements)
case let box:
preconditionFailure("Unclassified box: \(type(of: box))")
}
})
}
init(key: String, box: SimpleBox) {
self.init(key: key)
value = box.xmlString()
}
init(key: String, box: Box) {
switch box {
case let unkeyedBox as UnkeyedBox:
self.init(key: key, box: unkeyedBox)
case let keyedBox as KeyedBox:
self.init(key: key, box: keyedBox)
case let simpleBox as SimpleBox:
self.init(key: key, box: simpleBox)
case let box:
preconditionFailure("Unclassified box: \(type(of: box))")
}
}
mutating func append(value string: String) {
var value = self.value ?? ""
value += string.trimmingCharacters(in: .whitespacesAndNewlines)
self.value = value
}
mutating func append(element: _XMLElement, forKey key: String) {
elements[key, default: []].append(element)
}
func flatten() -> KeyedBox {
let attributes = self.attributes.mapValues { StringBox($0) }
var elements: [String: Box] = [:]
for (key, value) in self.elements {
for child in value {
if let content = child.value {
switch elements[key] {
case let unkeyedBox as UnkeyedBox:
unkeyedBox.append(StringBox(content))
elements[key] = unkeyedBox
case let keyedBox as StringBox:
elements[key] = UnkeyedBox([keyedBox, StringBox(content)])
default:
elements[key] = StringBox(content)
}
} else if !child.elements.isEmpty || !child.attributes.isEmpty {
let content = child.flatten()
if let existingValue = elements[key] {
if let unkeyedBox = existingValue as? UnkeyedBox {
var boxes = unkeyedBox.unbox()
boxes.append(content)
elements[key] = UnkeyedBox(boxes)
} else {
elements[key] = UnkeyedBox([existingValue, content])
}
} else {
elements[key] = content
}
} else {
switch elements[key] {
case let unkeyedBox as UnkeyedBox:
unkeyedBox.append(NullBox())
elements[key] = unkeyedBox
case let keyedBox as StringBox:
elements[key] = UnkeyedBox([keyedBox, NullBox()])
default:
elements[key] = NullBox()
}
}
}
}
return KeyedBox(elements: elements, attributes: attributes)
}
func toXMLString(with header: XMLHeader? = nil, withCDATA cdata: Bool, formatting: XMLEncoder.OutputFormatting, ignoreEscaping _: Bool = false) -> String {
if let header = header, let headerXML = header.toXML() {
return headerXML + _toXMLString(withCDATA: cdata, formatting: formatting)
}
return _toXMLString(withCDATA: cdata, formatting: formatting)
}
fileprivate func formatUnsortedXMLElements(_ string: inout String, _ level: Int, _ cdata: Bool, _ formatting: XMLEncoder.OutputFormatting, _ prettyPrinted: Bool) {
formatXMLElements(from: elements.map { (key: $0, value: $1) }, into: &string, at: level, cdata: cdata, formatting: formatting, prettyPrinted: prettyPrinted)
}
fileprivate func elementString(for element: (key: String, value: [_XMLElement]), at level: Int, cdata: Bool, formatting: XMLEncoder.OutputFormatting, prettyPrinted: Bool) -> String {
var string = ""
for child in element.value {
string += child._toXMLString(indented: level + 1, withCDATA: cdata, formatting: formatting)
string += prettyPrinted ? "\n" : ""
}
return string
}
fileprivate func formatSortedXMLElements(_ string: inout String, _ level: Int, _ cdata: Bool, _ formatting: XMLEncoder.OutputFormatting, _ prettyPrinted: Bool) {
formatXMLElements(from: elements.sorted { $0.key < $1.key }, into: &string, at: level, cdata: cdata, formatting: formatting, prettyPrinted: prettyPrinted)
}
fileprivate func attributeString(key: String, value: String) -> String {
return " \(key)=\"\(value.escape(_XMLElement.escapedCharacterSet))\""
}
fileprivate func formatXMLAttributes(from keyValuePairs: [(key: String, value: String)], into string: inout String) {
for (key, value) in keyValuePairs {
string += attributeString(key: key, value: value)
}
}
fileprivate func formatXMLElements(from elements: [(key: String, value: [_XMLElement])], into string: inout String, at level: Int, cdata: Bool, formatting: XMLEncoder.OutputFormatting, prettyPrinted: Bool) {
for element in elements {
string += elementString(for: element, at: level, cdata: cdata, formatting: formatting, prettyPrinted: prettyPrinted)
}
}
fileprivate func formatSortedXMLAttributes(_ string: inout String) {
formatXMLAttributes(from: attributes.sorted(by: { $0.key < $1.key }), into: &string)
}
fileprivate func formatUnsortedXMLAttributes(_ string: inout String) {
formatXMLAttributes(from: attributes.map { (key: $0, value: $1) }, into: &string)
}
fileprivate func formatXMLAttributes(_ formatting: XMLEncoder.OutputFormatting, _ string: inout String) {
if formatting.contains(.sortedKeys) {
formatSortedXMLAttributes(&string)
return
}
formatUnsortedXMLAttributes(&string)
}
fileprivate func formatXMLElements(_ formatting: XMLEncoder.OutputFormatting, _ string: inout String, _ level: Int, _ cdata: Bool, _ prettyPrinted: Bool) {
if formatting.contains(.sortedKeys) {
formatSortedXMLElements(&string, level, cdata, formatting, prettyPrinted)
return
}
formatUnsortedXMLElements(&string, level, cdata, formatting, prettyPrinted)
}
fileprivate func _toXMLString(indented level: Int = 0, withCDATA cdata: Bool, formatting: XMLEncoder.OutputFormatting, ignoreEscaping: Bool = false) -> String {
let prettyPrinted = formatting.contains(.prettyPrinted)
let indentation = String(repeating: " ", count: (prettyPrinted ? level : 0) * 4)
var string = indentation
string += "<\(key)"
formatXMLAttributes(formatting, &string)
if let value = value {
string += ">"
if !ignoreEscaping {
string += (cdata == true ? "<![CDATA[\(value)]]>" : "\(value.escape(_XMLElement.escapedCharacterSet))")
} else {
string += "\(value)"
}
string += "</\(key)>"
} else if !elements.isEmpty {
string += prettyPrinted ? ">\n" : ">"
formatXMLElements(formatting, &string, level, cdata, prettyPrinted)
string += indentation
string += "</\(key)>"
} else {
string += " />"
}
return string
}
}
extension _XMLElement: Equatable {}