0001    //
0002    //  JsonPropertyLoader.swift
0003    //  Swinject
0004    //
0005    //  Created by mike.owens on 12/6/15.
0006    //  Copyright © 2015 Swinject Contributors. All rights reserved.
0007    //
0008    
0009    import Foundation
0010    
0011    
0012    /// The JsonPropertyLoader will load properties from JSON resources
0013    final public class JsonPropertyLoader
JsonPropertyLoader.swift:67
extension JsonPropertyLoader: PropertyLoaderType {
 {
0014        
0015        /// the bundle where the resource exists (defualts to mainBundle)
0016        private let bundle
JsonPropertyLoader.swift:29
        self.bundle = bundle!
JsonPropertyLoader.swift:69
        let contents = try loadStringFromBundle(bundle, withName: name, ofType: "json")
JsonPropertyLoader.swift:75
            throw PropertyLoaderError.InvalidJSONFormat(bundle: bundle, name: name)
: NSBundle
0017        
0018        /// the name of the JSON resource. For example, if your resource is "properties.json" then this value will be set to "properties"
0019        private let name
JsonPropertyLoader.swift:30
        self.name = name
JsonPropertyLoader.swift:69
        let contents = try loadStringFromBundle(bundle, withName: name, ofType: "json")
JsonPropertyLoader.swift:75
            throw PropertyLoaderError.InvalidJSONFormat(bundle: bundle, name: name)
: String
0020        
0021        ///
0022        /// Will create a JSON property loader
0023        ///
0024        /// - parameter bundle: the bundle where the resource exists (defaults to mainBundle)
0025        /// - parameter name:   the name of the JSON resource. For example, if your resource is "properties.json" 
0026        ///                     then this value will be set to "properties"
0027        ///
0028        public init(bundle: NSBundle? = .mainBundle(), name: String) {
0029            self.bundle = bundle!
0030            self.name = name
0031        }
0032        
0033        /// Will strip the provide string of comments. This allows JSON property files to contain comments as it
0034        /// is valuable to provide more context to a property then just its key-value and comments are not valid JSON
0035        /// so this will process the JSON string before we attempt to parse the JSON into objects
0036        ///
0037        /// Implementation influence by Typhoon:
0038        /// https://github.com/appsquickly/Typhoon/blob/master/Source/Configuration/ConfigPostProcessor/TyphoonConfiguration/TyphoonJsonStyleConfiguration.m#L30
0039        ///
0040        /// - Parameter str: the string to strip of comments
0041        ///
0042        /// - Returns: the json string stripper of comments
0043        private func stringWithoutComments
JsonPropertyLoader.swift:70
        let jsonWithoutComments = stringWithoutComments(contents)
(str: String) -> String {
0044            let pattern = "(([\"'])(?:\\\\\\2|.)*?\\2)|(\\/\\/[^\\n\\r]*(?:[\\n\\r]+|$)|(\\/\\*(?:(?!\\*\\/).|[\\n\\r])*\\*\\/))"
0045            let expression = try? NSRegularExpression(pattern: pattern, options: .AnchorsMatchLines)
0046            
0047            let matches = expression!.matchesInString(str, options: NSMatchingOptions(rawValue: 0),
0048                range: NSRange(location: 0, length: str.characters.count))
0049            
0050            guard !matches.isEmpty else {
0051                return str
0052            }
0053            
0054            let ret = NSMutableString(string: str)
0055            
0056            for match in matches.reverse() {
0057                let character = String(str[str.startIndex.advancedBy(match.range.location)])
0058                if character != "\'" && character != "\"" {
0059                    ret.replaceCharactersInRange(match.range, withString: "")
0060                }
0061            }
0062            return ret as String
0063        }
0064    }
0065    
0066    // MARK: - PropertyLoadable
0067    extension JsonPropertyLoader: PropertyLoaderType {
0068        public func load() throws -> [String : AnyObject] {
0069            let contents = try loadStringFromBundle(bundle, withName: name, ofType: "json")
0070            let jsonWithoutComments = stringWithoutComments(contents)
0071            let data = jsonWithoutComments.dataUsingEncoding(NSUTF8StringEncoding)
0072            
0073            let json = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions(rawValue: 0))
0074            guard let props = json as? [String:AnyObject] else {
0075                throw PropertyLoaderError.InvalidJSONFormat(bundle: bundle, name: name)
0076            }
0077            return props
0078            
0079        }
0080    }
0081