0001    // URLEncodedFormInterchangeDataParser.swift
0002    //
0003    // The MIT License (MIT)
0004    //
0005    // Copyright (c) 2015 Zewo
0006    //
0007    // Permission is hereby granted, free of charge, to any person obtaining a copy
0008    // of this software and associated documentation files (the "Software"), to deal
0009    // in the Software without restriction, including without limitation the rights
0010    // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
0011    // copies of the Software, and to permit persons to whom the Software is
0012    // furnished to do so, subject to the following conditions:
0013    //
0014    // The above copyright notice and this permission notice shall be included in all
0015    // copies or substantial portions of the Software.
0016    //
0017    // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0018    // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0019    // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
0020    // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
0021    // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
0022    // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
0023    // SOFTWARE.
0024    
0025    @_exported import InterchangeData
0026    @_exported import String
0027    
0028    enum URLEncodedFormInterchangeDataParseError: ErrorType {
0029        case UnsupportedEncoding
0030        case MalformedURLEncodedForm
0031    }
0032    
0033    public struct URLEncodedFormInterchangeDataParser: InterchangeDataParser {
0034        public init() {}
0035    
0036        public func parse(data: Data) throws -> InterchangeData {
0037            guard let string = try? String(data: data) else {
0038                throw URLEncodedFormParseError.UnsupportedEncoding
0039            }
0040    
0041            var interchangeData: InterchangeData = [:]
0042    
0043            for parameter in string.split("&") {
0044                let tokens = parameter.split("=")
0045    
0046                if tokens.count ==  {
0047                    let key = try String(percentEncoded: tokens[])
0048                    let value = try String(percentEncoded: tokens[])
0049    
0050                    interchangeData[key] = InterchangeData.from(value)
0051                } else {
0052                    throw URLEncodedFormParseError.MalformedURLEncodedForm
0053                }
0054            }
0055    
0056            return interchangeData
0057        }
0058    }
0059