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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 XMLCoderElement: Equatable {
static let attributesKey = "___ATTRIBUTES"
static let escapedCharacterSet = [
("&", "&"),
("<", "<"),
(">", ">"),
("'", "'"),
("\"", """),
]
var key: String
var value: String?
var elements: [XMLCoderElement] = []
var attributes: [String: String] = [:]
init(
key: String,
value: String? = nil,
elements: [XMLCoderElement] = [],
attributes: [String: String] = [:]
) {
self.key = key
self.value = value
self.elements = elements
self.attributes = attributes
}
mutating func append(value string: String) {
guard value != nil else {
value = string
return
}
value?.append(string)
}
mutating func append(element: XMLCoderElement, forKey key: String) {
elements.append(element)
}
func transformToBoxTree() -> KeyedBox {
let attributes = KeyedStorage(self.attributes.map { key, value in
(key: key, value: StringBox(value) as SimpleBox)
})
let storage = KeyedStorage<String, Box>()
var elements = self.elements.reduce(storage) { $0.merge(element: $1) }
// Handle attributed unkeyed value <foo attr="bar">zap</foo>
// Value should be zap. Detect only when no other elements exist
if elements.isEmpty, let value = value {
elements["value"] = StringBox(value)
}
let keyedBox = KeyedBox(elements: elements, attributes: attributes)
return keyedBox
}
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)
}
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 {
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 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: [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)
}
}
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
)
}
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,
ignoreEscaping: Bool = false
) -> 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 let value = value {
if !key.isEmpty {
string += ">"
}
if !ignoreEscaping {
string += (cdata == true ? "<![CDATA[\(value)]]>" :
"\(value.escape(XMLCoderElement.escapedCharacterSet))")
} else {
string += "\(value)"
}
if !key.isEmpty {
string += "</\(key)>"
}
} else if !elements.isEmpty {
string += prettyPrinted ? ">\n" : ">"
formatXMLElements(formatting, &string, level, cdata, prettyPrinted)
string += indentation
if !key.isEmpty {
string += "</\(key)>"
}
} else {
string += " />"
}
return string
}
}
// MARK: - Convenience Initializers
extension XMLCoderElement {
init(key: String, box: UnkeyedBox) {
self.init(key: key, elements: box.map {
XMLCoderElement(key: key, box: $0)
})
}
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: [String: String] = Dictionary(
uniqueKeysWithValues: box.attributes.compactMap { key, box in
guard let value = box.xmlString() else {
return nil
}
return (key, value)
}
)
self.init(key: key, elements: elements, attributes: attributes)
}
init(key: String, box: SimpleBox) {
self.init(key: key)
value = box.xmlString()
}
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 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))")
}
}
}