Updated to support changes to the Swift Language in Xcode 6 beta 5. Also updated SWXMLHash to latest commit.

Author: MikePulsiferDOL

GovDataRequest.swift

@@ -116,15 +116,14 @@ class GovDataRequest {
             var err: NSError?
             if self.responseFormat == "JSON" {
                 var jsonResult = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &err) as NSDictionary
-                if(err?) {
+                if(err != nil) {
                     // If there is an error parson JSON, print it to the console
                     NSLog ("Error parsing the JSON")
                 }
                 self.delegate?.didCompleteWithDictionary(jsonResult)
             } else if self.responseFormat == "XML" {
-                let parser = SWXMLHash()
                 var dataString = NSString(data: data, encoding: NSUTF8StringEncoding)
-                let xml = parser.parse(dataString)
+                let xml = SWXMLHash.parse(dataString)
                 self.delegate?.didCompleteWithXML(xml)
             }
             })

SWXMLHash.swift

@@ -0,0 +1,277 @@
+//
+//  SWXMLHash.swift
+//
+//  Copyright (c) 2014 David Mohundro
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+import Foundation
+
+/// Simple XML parser.
+public class SWXMLHash {
+    /**
+        Method to parse XML passed in as a string.
+    
+        :param: xml The XML to be parsed
+    
+        :returns: An XMLIndexer instance that is used to look up elements in the XML
+    */
+    class public func parse(xml: String) -> XMLIndexer {
+        return parse((xml as NSString).dataUsingEncoding(NSUTF8StringEncoding))
+    }
+
+    /**
+        Method to parse XML passed in as an NSData instance.
+    
+        :param: xml The XML to be parsed
+    
+        :returns: An XMLIndexer instance that is used to look up elements in the XML
+    */
+    class public func parse(data: NSData) -> XMLIndexer {
+        var parser = XMLParser()
+        return parser.parse(data)
+    }
+}
+
+/// The implementation of NSXMLParserDelegate and where the parsing actually happens.
+class XMLParser : NSObject, NSXMLParserDelegate {
+    var parsingElement: String = ""
+
+    override init() {
+        currentNode = root
+        super.init()
+    }
+
+    var lastResults: String = ""
+
+    var root = XMLElement(name: "root")
+    var currentNode: XMLElement
+    var parentStack = [XMLElement]()
+
+    func parse(data: NSData) -> XMLIndexer {
+        // clear any prior runs of parse... expected that this won't be necessary, but you never know
+        parentStack.removeAll(keepCapacity: false)
+        root = XMLElement(name: "root")
+
+        parentStack.append(root)
+
+        let parser = NSXMLParser(data: data)
+        parser.delegate = self
+        parser.parse()
+
+        return XMLIndexer(root)
+    }
+
+    func parser(parser: NSXMLParser!, didStartElement elementName: String!, namespaceURI: String!, qualifiedName: String!, attributes attributeDict: NSDictionary!) {
+
+        self.parsingElement = elementName
+
+        currentNode = parentStack[parentStack.count - 1].addElement(elementName, withAttributes: attributeDict)
+        parentStack.append(currentNode)
+
+        lastResults = ""
+    }
+
+    func parser(parser: NSXMLParser!, foundCharacters string: String!) {
+        lastResults += string
+    }
+
+    func parser(parser: NSXMLParser!, didEndElement elementName: String!, namespaceURI: String!, qualifiedName qName: String!) {
+        if !lastResults.isEmpty {
+            currentNode.text = lastResults
+        }
+
+        parentStack.removeLast()
+    }
+}
+
+/// Returned from SWXMLHash, allows easy element lookup into XML data.
+public enum XMLIndexer {
+    case Element(XMLElement)
+    case List([XMLElement])
+    case Error(NSError)
+
+    /// The underlying XMLElement at the currently indexed level of XML.
+    public var element: XMLElement? {
+    get {
+        switch self {
+        case .Element(let elem):
+            return elem
+        default:
+            return nil
+        }
+    }
+    }
+
+    /// The underlying array of XMLElements at the currently indexed level of XML.
+    public var all: [XMLIndexer] {
+    get {
+        switch self {
+        case .List(let list):
+            var xmlList = [XMLIndexer]()
+            for elem in list {
+                xmlList.append(XMLIndexer(elem))
+            }
+            return xmlList
+        case .Element(let elem):
+            return [XMLIndexer(elem)]
+        default:
+            return []
+        }
+    }
+    }
+
+    /**
+        Initializes the XMLIndexer
+    
+        :param: _ should be an instance of XMLElement, but supports other values for error handling
+    
+        :returns: instance of XMLIndexer
+    */
+    public init(_ rawObject: AnyObject) {
+        switch rawObject {
+        case let value as XMLElement:
+            self = .Element(value)
+        default:
+            self = .Error(NSError(domain: "SWXMLDomain", code: 1000, userInfo: nil))
+        }
+    }
+
+    /**
+        Find an XML element at the current level by element name
+    
+        :param: key The element name to index by
+    
+        :returns: instance of XMLIndexer to match the element (or elements) found by key
+    */
+    public subscript(key: String) -> XMLIndexer {
+        get {
+            let userInfo = [NSLocalizedDescriptionKey: "XML Element Error: Incorrect key [\"\(key)\"]"]
+            switch self {
+            case .Element(let elem):
+                if let match = elem.elements[key] {
+                    if match.count == 1 {
+                        return .Element(match[0])
+                    }
+                    else {
+                        return .List(match)
+                    }
+                }
+                return .Error(NSError(domain: "SWXMLDomain", code: 1000, userInfo: userInfo))
+            default:
+                return .Error(NSError(domain: "SWXMLDomain", code: 1000, userInfo: userInfo))
+            }
+        }
+    }
+
+    /**
+        Find an XML element by index within a list of XML Elements at the current level
+    
+        :param: index The 0-based index to index by
+    
+        :returns: instance of XMLIndexer to match the element (or elements) found by key
+    */
+    public subscript(index: Int) -> XMLIndexer {
+        get {
+            let userInfo = [NSLocalizedDescriptionKey: "XML Element Error: Incorrect index [\"\(index)\"]"]
+            switch self {
+            case .List(let list):
+                if index <= list.count {
+                    return .Element(list[index])
+                }
+                return .Error(NSError(domain: "SWXMLDomain", code: 1000, userInfo: userInfo))
+            case .Element(let elem):
+                if index == 0 {
+                    return .Element(elem)
+                }
+                else {
+                    return .Error(NSError(domain: "SWXMLDomain", code: 1000, userInfo: userInfo))
+                }
+            default:
+                return .Error(NSError(domain: "SWXMLDomain", code: 1000, userInfo: userInfo))
+            }
+        }
+    }
+}
+
+/// XMLIndexer extensions
+extension XMLIndexer: BooleanType {
+    /// True if a valid XMLIndexer, false if an error type
+    public var boolValue: Bool {
+        get {
+            switch self {
+            case .Error:
+                return false
+            default:
+                return true
+            }
+        }
+    }
+}
+
+/// Models an XML element, including name, text and attributes
+public class XMLElement {
+    /// The name of the element
+    public let name: String
+    /// The inner text of the element, if it exists
+    public var text: String?
+    /// The attributes of the element
+    public var attributes = [String:String]()
+
+    var elements = [String:[XMLElement]]()
+
+    /**
+        Initialize an XMLElement instance
+    
+        :param: name The name of the element to be initialized
+    
+        :returns: a new instance of XMLElement
+    */
+    init(name: String) {
+        self.name = name
+    }
+
+    /**
+        Adds a new XMLElement underneath this instance of XMLElement
+    
+        :param: name The name of the new element to be added
+        :param: withAttributes The attributes dictionary for the element being added
+    
+        :returns: The XMLElement that has now been added
+    */
+    func addElement(name: String, withAttributes attributes: NSDictionary) -> XMLElement {
+        let element = XMLElement(name: name)
+
+        if var group = elements[name] {
+            group.append(element)
+            elements[name] = group
+        }
+        else {
+            elements[name] = [element]
+        }
+
+        for (keyAny,valueAny) in attributes {
+            let key = keyAny as String
+            let value = valueAny as String
+            element.attributes[key] = value
+        }
+
+        return element
+    }
+}