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XMLCoderElement.swift
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XMLCoderElement.swift
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//
// XMLCoderElement.swift
// XMLCoder
//
// Created by Vincent Esche on 12/18/18.
//
import Foundation
struct Attribute: Equatable {
let key: String
let value: String
}
struct XMLCoderElement: Equatable {
private static let attributesKey = "___ATTRIBUTES"
private static let escapedCharacterSet = [
("&", "&"),
("<", "<"),
(">", ">"),
("'", "'"),
("\"", """),
]
let key: String
private(set) var stringValue: String?
private(set) var elements: [XMLCoderElement] = []
private(set) var attributes: [Attribute] = []
private(set) var containsTextNodes: Bool = false
var isStringNode: Bool {
return key == ""
}
var isCDATANode: Bool {
return key == "#CDATA"
}
var isTextNode: Bool {
return isStringNode || isCDATANode
}
init(
key: String,
elements: [XMLCoderElement] = [],
attributes: [Attribute] = []
) {
self.key = key
stringValue = nil
self.elements = elements
self.attributes = attributes
}
init(
key: String,
stringValue string: String,
attributes: [Attribute] = []
) {
self.key = key
elements = [XMLCoderElement(stringValue: string)]
self.attributes = attributes
containsTextNodes = true
}
init(
key: String,
cdataValue string: String,
attributes: [Attribute] = []
) {
self.key = key
elements = [XMLCoderElement(cdataValue: string)]
self.attributes = attributes
containsTextNodes = true
}
init(stringValue string: String) {
key = ""
stringValue = string
}
init(cdataValue string: String) {
key = "#CDATA"
stringValue = string
}
mutating func append(element: XMLCoderElement, forKey key: String) {
elements.append(element)
containsTextNodes = containsTextNodes || element.isTextNode
}
mutating func append(string: String) {
if elements.last?.isTextNode == true {
let oldValue = elements[elements.count - 1].stringValue ?? ""
elements[elements.count - 1].stringValue = oldValue + string
} else {
elements.append(XMLCoderElement(stringValue: string))
}
containsTextNodes = true
}
mutating func append(cdata string: String) {
if elements.last?.isCDATANode == true {
let oldValue = elements[elements.count - 1].stringValue ?? ""
elements[elements.count - 1].stringValue = oldValue + string
} else {
elements.append(XMLCoderElement(cdataValue: string))
}
containsTextNodes = true
}
func transformToBoxTree() -> Box {
if isTextNode {
return StringBox(stringValue!)
}
let attributes = KeyedStorage(self.attributes.map { attribute in
(key: attribute.key, value: StringBox(attribute.value) as SimpleBox)
})
let storage = KeyedStorage<String, Box>()
let elements = self.elements.reduce(storage) { $0.merge(element: $1) }
return KeyedBox(elements: elements, attributes: attributes)
}
func toXMLString(with header: XMLHeader? = nil,
withCDATA cdata: Bool,
formatting: XMLEncoder.OutputFormatting) -> String {
if let header = header, let headerXML = header.toXML() {
return headerXML + _toXMLString(withCDATA: cdata, formatting: formatting)
}
return _toXMLString(withCDATA: cdata, formatting: formatting)
}
private func formatUnsortedXMLElements(
_ string: inout String,
_ level: Int,
_ cdata: Bool,
_ formatting: XMLEncoder.OutputFormatting,
_ prettyPrinted: Bool
) {
formatXMLElements(
from: elements,
into: &string,
at: level,
cdata: cdata,
formatting: formatting,
prettyPrinted: prettyPrinted
)
}
fileprivate func elementString(
for element: XMLCoderElement,
at level: Int,
cdata: Bool,
formatting: XMLEncoder.OutputFormatting,
prettyPrinted: Bool
) -> String {
if let stringValue = element.stringValue {
if element.isCDATANode || cdata {
return "<![CDATA[\(stringValue)]]>"
} else {
return stringValue.escape(XMLCoderElement.escapedCharacterSet)
}
}
var string = ""
string += element._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(XMLCoderElement.escapedCharacterSet))\""
}
fileprivate func formatXMLAttributes(
from attributes: [Attribute],
into string: inout String
) {
for attribute in attributes {
string += attributeString(key: attribute.key, value: attribute.value)
}
}
fileprivate func formatXMLElements(
from elements: [XMLCoderElement],
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 && !containsTextNodes)
}
}
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, into: &string)
}
private func formatXMLAttributes(
_ formatting: XMLEncoder.OutputFormatting,
_ string: inout String
) {
if formatting.contains(.sortedKeys) {
formatSortedXMLAttributes(&string)
return
}
formatUnsortedXMLAttributes(&string)
}
private 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
)
}
private func _toXMLString(
indented level: Int = 0,
withCDATA cdata: Bool,
formatting: XMLEncoder.OutputFormatting
) -> String {
let prettyPrinted = formatting.contains(.prettyPrinted)
let indentation = String(
repeating: " ", count: (prettyPrinted ? level : 0) * 4
)
var string = indentation
if !key.isEmpty {
string += "<\(key)"
}
formatXMLAttributes(formatting, &string)
if !elements.isEmpty {
let prettyPrintElements = prettyPrinted && !containsTextNodes
if !key.isEmpty {
string += prettyPrintElements ? ">\n" : ">"
}
formatXMLElements(formatting, &string, level, cdata, prettyPrintElements)
if prettyPrintElements { string += indentation }
if !key.isEmpty {
string += "</\(key)>"
}
} else {
string += " />"
}
return string
}
}
// MARK: - Convenience Initializers
extension XMLCoderElement {
init(key: String, box: UnkeyedBox) {
if let containsChoice = box as? [ChoiceBox] {
self.init(key: key, elements: containsChoice.map {
XMLCoderElement(key: $0.key, box: $0.element)
})
} else {
self.init(key: key, elements: box.map { XMLCoderElement(key: key, box: $0) })
}
}
init(key: String, box: ChoiceBox) {
self.init(key: key, elements: [XMLCoderElement(key: box.key, box: box.element)])
}
init(key: String, box: KeyedBox) {
var elements: [XMLCoderElement] = []
for (key, box) in box.elements {
let fail = {
preconditionFailure("Unclassified box: \(type(of: box))")
}
switch box {
case let sharedUnkeyedBox as SharedBox<UnkeyedBox>:
let box = sharedUnkeyedBox.unboxed
elements.append(contentsOf: box.map {
XMLCoderElement(key: key, box: $0)
})
case let unkeyedBox as UnkeyedBox:
// This basically injects the unkeyed children directly into self:
elements.append(contentsOf: unkeyedBox.map {
XMLCoderElement(key: key, box: $0)
})
case let sharedKeyedBox as SharedBox<KeyedBox>:
let box = sharedKeyedBox.unboxed
elements.append(XMLCoderElement(key: key, box: box))
case let keyedBox as KeyedBox:
elements.append(XMLCoderElement(key: key, box: keyedBox))
case let simpleBox as SimpleBox:
elements.append(XMLCoderElement(key: key, box: simpleBox))
default:
fail()
}
}
let attributes: [Attribute] = box.attributes.compactMap { key, box in
guard let value = box.xmlString else {
return nil
}
return Attribute(key: key, value: value)
}
self.init(key: key, elements: elements, attributes: attributes)
}
init(key: String, box: SimpleBox) {
if let value = box.xmlString {
self.init(key: key, stringValue: value)
} else {
self.init(key: key)
}
}
init(key: String, box: Box) {
switch box {
case let sharedUnkeyedBox as SharedBox<UnkeyedBox>:
self.init(key: key, box: sharedUnkeyedBox.unboxed)
case let sharedKeyedBox as SharedBox<KeyedBox>:
self.init(key: key, box: sharedKeyedBox.unboxed)
case let sharedChoiceBox as SharedBox<ChoiceBox>:
self.init(key: key, box: sharedChoiceBox.unboxed)
case let unkeyedBox as UnkeyedBox:
self.init(key: key, box: unkeyedBox)
case let keyedBox as KeyedBox:
self.init(key: key, box: keyedBox)
case let choiceBox as ChoiceBox:
self.init(key: key, box: choiceBox)
case let simpleBox as SimpleBox:
self.init(key: key, box: simpleBox)
case let box:
preconditionFailure("Unclassified box: \(type(of: box))")
}
}
}