Alamofire/Tests/RequestTests.swift

//
//  RequestTests.swift
//
//  Copyright (c) 2014-2016 Alamofire Software Foundation (http://alamofire.org/)
//
//  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 Alamofire
import Foundation
import XCTest

class RequestInitializationTestCase: BaseTestCase {
    func testRequestClassMethodWithMethodAndURL() {
        // Given
        let urlString = "https://httpbin.org/"

        // When
        let request = Alamofire.request(urlString, withMethod: .get)

        // Then
        XCTAssertNotNil(request.request, "request URL request should not be nil")
        XCTAssertEqual(request.request?.httpMethod ?? "", "GET", "request HTTP method should match expected value")
        XCTAssertEqual(request.request?.urlString ?? "", urlString, "request URL string should be equal")
        XCTAssertNil(request.response, "request response should be nil")
    }

    func testRequestClassMethodWithMethodAndURLAndParameters() {
        // Given
        let urlString = "https://httpbin.org/get"

        // When
        let request = Alamofire.request(urlString, withMethod: .get, parameters: ["foo": "bar"])

        // Then
        XCTAssertNotNil(request.request, "request URL request should not be nil")
        XCTAssertEqual(request.request?.httpMethod ?? "", "GET", "request HTTP method should match expected value")
        XCTAssertNotEqual(request.request?.urlString ?? "", urlString, "request URL string should be equal")
        XCTAssertEqual(request.request?.url?.query ?? "", "foo=bar", "query is incorrect")
        XCTAssertNil(request.response, "request response should be nil")
    }

    func testRequestClassMethodWithMethodURLParametersAndHeaders() {
        // Given
        let urlString = "https://httpbin.org/get"
        let headers = ["Authorization": "123456"]

        // When
        let request = Alamofire.request(urlString, withMethod: .get, parameters: ["foo": "bar"], headers: headers)

        // Then
        XCTAssertNotNil(request.request, "request should not be nil")
        XCTAssertEqual(request.request?.httpMethod ?? "", "GET", "request HTTP method should match expected value")
        XCTAssertNotEqual(request.request?.urlString ?? "", urlString, "request URL string should be equal")
        XCTAssertEqual(request.request?.url?.query ?? "", "foo=bar", "query is incorrect")

        let authorizationHeader = request.request?.value(forHTTPHeaderField: "Authorization") ?? ""
        XCTAssertEqual(authorizationHeader, "123456", "Authorization header is incorrect")

        XCTAssertNil(request.response, "response should be nil")
    }
}

// MARK: -

class RequestResponseTestCase: BaseTestCase {
    func testRequestResponse() {
        // Given
        let urlString = "https://httpbin.org/get"

        let expectation = self.expectation(description: "GET request should succeed: \(urlString)")

        var request: URLRequest?
        var response: HTTPURLResponse?
        var data: Data?
        var error: NSError?

        // When
        Alamofire.request(urlString, withMethod: .get, parameters: ["foo": "bar"])
            .response { responseRequest, responseResponse, responseData, responseError in
                request = responseRequest
                response = responseResponse
                data = responseData
                error = responseError

                expectation.fulfill()
            }

        waitForExpectations(timeout: timeout, handler: nil)

        // Then
        XCTAssertNotNil(request, "request should not be nil")
        XCTAssertNotNil(response, "response should not be nil")
        XCTAssertNotNil(data, "data should not be nil")
        XCTAssertNil(error, "error should be nil")
    }

    func testRequestResponseWithProgress() {
        // Given
        let randomBytes = 4 * 1024 * 1024
        let urlString = "https://httpbin.org/bytes/\(randomBytes)"

        let expectation = self.expectation(description: "Bytes download progress should be reported: \(urlString)")

        var byteValues: [(bytes: Int64, totalBytes: Int64, totalBytesExpected: Int64)] = []
        var progressValues: [(completedUnitCount: Int64, totalUnitCount: Int64)] = []
        var responseRequest: URLRequest?
        var responseResponse: HTTPURLResponse?
        var responseData: Data?
        var responseError: Error?

        // When
        let request = Alamofire.request(urlString, withMethod: .get)
        request.progress { bytesRead, totalBytesRead, totalBytesExpectedToRead in
            let bytes = (bytes: bytesRead, totalBytes: totalBytesRead, totalBytesExpected: totalBytesExpectedToRead)
            byteValues.append(bytes)

            let progress = (
                completedUnitCount: request.progress.completedUnitCount,
                totalUnitCount: request.progress.totalUnitCount
            )
            progressValues.append(progress)
        }
        request.response { request, response, data, error in
            responseRequest = request
            responseResponse = response
            responseData = data
            responseError = error

            expectation.fulfill()
        }

        waitForExpectations(timeout: timeout, handler: nil)

        // Then
        XCTAssertNotNil(responseRequest, "response request should not be nil")
        XCTAssertNotNil(responseResponse, "response response should not be nil")
        XCTAssertNotNil(responseData, "response data should not be nil")
        XCTAssertNil(responseError, "response error should be nil")

        XCTAssertEqual(byteValues.count, progressValues.count, "byteValues count should equal progressValues count")

        if byteValues.count == progressValues.count {
            for index in 0..<byteValues.count {
                let byteValue = byteValues[index]
                let progressValue = progressValues[index]

                XCTAssertGreaterThan(byteValue.bytes, 0, "reported bytes should always be greater than 0")
                XCTAssertEqual(
                    byteValue.totalBytes,
                    progressValue.completedUnitCount,
                    "total bytes should be equal to completed unit count"
                )
                XCTAssertEqual(
                    byteValue.totalBytesExpected,
                    progressValue.totalUnitCount,
                    "total bytes expected should be equal to total unit count"
                )
            }
        }

        if let lastByteValue = byteValues.last, let lastProgressValue = progressValues.last {
            let byteValueFractionalCompletion = Double(lastByteValue.totalBytes) / Double(lastByteValue.totalBytesExpected)
            let progressValueFractionalCompletion = Double(lastProgressValue.0) / Double(lastProgressValue.1)

            XCTAssertEqual(byteValueFractionalCompletion, 1.0, "byte value fractional completion should equal 1.0")
            XCTAssertEqual(progressValueFractionalCompletion, 1.0, "progress value fractional completion should equal 1.0")
        } else {
            XCTFail("last item in bytesValues and progressValues should not be nil")
        }
    }

    func testRequestResponseWithStream() {
        // Given
        let randomBytes = 4 * 1024 * 1024
        let urlString = "https://httpbin.org/bytes/\(randomBytes)"

        let expectation = self.expectation(description: "Bytes download progress should be reported: \(urlString)")

        var byteValues: [(bytes: Int64, totalBytes: Int64, totalBytesExpected: Int64)] = []
        var progressValues: [(completedUnitCount: Int64, totalUnitCount: Int64)] = []
        var accumulatedData = [Data]()

        var responseRequest: URLRequest?
        var responseResponse: HTTPURLResponse?
        var responseData: Data?
        var responseError: Error?

        // When
        let request = Alamofire.request(urlString, withMethod: .get)
        request.progress { bytesRead, totalBytesRead, totalBytesExpectedToRead in
            let bytes = (bytes: bytesRead, totalBytes: totalBytesRead, totalBytesExpected: totalBytesExpectedToRead)
            byteValues.append(bytes)

            let progress = (
                completedUnitCount: request.progress.completedUnitCount,
                totalUnitCount: request.progress.totalUnitCount
            )
            progressValues.append(progress)
        }
        request.stream { accumulatedData.append($0) }
        request.response { request, response, data, error in
            responseRequest = request
            responseResponse = response
            responseData = data
            responseError = error

            expectation.fulfill()
        }

        waitForExpectations(timeout: timeout, handler: nil)

        // Then
        XCTAssertNotNil(responseRequest, "response request should not be nil")
        XCTAssertNotNil(responseResponse, "response response should not be nil")
        XCTAssertNil(responseData, "response data should be nil")
        XCTAssertNil(responseError, "response error should be nil")
        XCTAssertGreaterThanOrEqual(accumulatedData.count, 1, "accumulated data should have one or more parts")

        XCTAssertEqual(byteValues.count, progressValues.count, "byteValues count should equal progressValues count")

        if byteValues.count == progressValues.count {
            for index in 0..<byteValues.count {
                let byteValue = byteValues[index]
                let progressValue = progressValues[index]

                XCTAssertGreaterThan(byteValue.bytes, 0, "reported bytes should always be greater than 0")
                XCTAssertEqual(
                    byteValue.totalBytes,
                    progressValue.completedUnitCount,
                    "total bytes should be equal to completed unit count"
                )
                XCTAssertEqual(
                    byteValue.totalBytesExpected,
                    progressValue.totalUnitCount,
                    "total bytes expected should be equal to total unit count"
                )
            }
        }

        if let lastByteValue = byteValues.last, let lastProgressValue = progressValues.last {
            let byteValueFractionalCompletion = Double(lastByteValue.totalBytes) / Double(lastByteValue.totalBytesExpected)
            let progressValueFractionalCompletion = Double(lastProgressValue.0) / Double(lastProgressValue.1)

            XCTAssertEqual(byteValueFractionalCompletion, 1.0, "byte value fractional completion should equal 1.0")
            XCTAssertEqual(
                progressValueFractionalCompletion,
                1.0,
                "progress value fractional completion should equal 1.0"
            )
            XCTAssertEqual(
                accumulatedData.reduce(Int64(0)) { $0 + $1.count },
                lastByteValue.totalBytes,
                "accumulated data length should match byte count"
            )
        } else {
            XCTFail("last item in bytesValues and progressValues should not be nil")
        }
    }

    func testPOSTRequestWithUnicodeParameters() {
        // Given
        let urlString = "https://httpbin.org/post"
        let parameters = [
            "french": "français",
            "japanese": "日本語",
            "arabic": "العربية",
            "emoji": "😃"
        ]

        let expectation = self.expectation(description: "request should succeed")

        var response: Response<AnyObject, NSError>?

        // When
        Alamofire.request(urlString, withMethod: .post, parameters: parameters)
            .responseJSON { closureResponse in
                response = closureResponse
                expectation.fulfill()
            }

        waitForExpectations(timeout: timeout, handler: nil)

        // Then
        if let response = response {
            XCTAssertNotNil(response.request, "request should not be nil")
            XCTAssertNotNil(response.response, "response should not be nil")
            XCTAssertNotNil(response.data, "data should not be nil")

            if let json = response.result.value as? [String: AnyObject], let form = json["form"] as? [String: String] {
                XCTAssertEqual(form["french"], parameters["french"], "french parameter value should match form value")
                XCTAssertEqual(form["japanese"], parameters["japanese"], "japanese parameter value should match form value")
                XCTAssertEqual(form["arabic"], parameters["arabic"], "arabic parameter value should match form value")
                XCTAssertEqual(form["emoji"], parameters["emoji"], "emoji parameter value should match form value")
            } else {
                XCTFail("form parameter in JSON should not be nil")
            }
        } else {
            XCTFail("response should not be nil")
        }
    }

    func testPOSTRequestWithBase64EncodedImages() {
        // Given
        let urlString = "https://httpbin.org/post"

        let pngBase64EncodedString: String = {
            let URL = url(forResource: "unicorn", withExtension: "png")
            let data = try! Data(contentsOf: URL)

            return data.base64EncodedString(options: .lineLength64Characters)
        }()

        let jpegBase64EncodedString: String = {
            let URL = url(forResource: "rainbow", withExtension: "jpg")
            let data = try! Data(contentsOf: URL)

            return data.base64EncodedString(options: .lineLength64Characters)
        }()

        let parameters = [
            "email": "user@alamofire.org",
            "png_image": pngBase64EncodedString,
            "jpeg_image": jpegBase64EncodedString
        ]

        let expectation = self.expectation(description: "request should succeed")

        var response: Response<AnyObject, NSError>?

        // When
        Alamofire.request(urlString, withMethod: .post, parameters: parameters)
            .responseJSON { closureResponse in
                response = closureResponse
                expectation.fulfill()
            }

        waitForExpectations(timeout: timeout, handler: nil)

        // Then
        if let response = response {
            XCTAssertNotNil(response.request, "request should not be nil")
            XCTAssertNotNil(response.response, "response should not be nil")
            XCTAssertNotNil(response.data, "data should not be nil")
            XCTAssertTrue(response.result.isSuccess, "result should be success")

            if let json = response.result.value as? [String: AnyObject], let form = json["form"] as? [String: String] {
                XCTAssertEqual(form["email"], parameters["email"], "email parameter value should match form value")
                XCTAssertEqual(form["png_image"], parameters["png_image"], "png_image parameter value should match form value")
                XCTAssertEqual(form["jpeg_image"], parameters["jpeg_image"], "jpeg_image parameter value should match form value")
            } else {
                XCTFail("form parameter in JSON should not be nil")
            }
        } else {
            XCTFail("response should not be nil")
        }
    }
}

// MARK: -

extension Request {
    private func preValidate(operation: (Void) -> Void) -> Self {
        delegate.queue.addOperation {
            operation()
        }

        return self
    }

    private func postValidate(operation: (Void) -> Void) -> Self {
        delegate.queue.addOperation {
            operation()
        }

        return self
    }
}

// MARK: -

class RequestExtensionTestCase: BaseTestCase {
    func testThatRequestExtensionHasAccessToTaskDelegateQueue() {
        // Given
        let urlString = "https://httpbin.org/get"
        let expectation = self.expectation(description: "GET request should succeed: \(urlString)")

        var responses: [String] = []

        // When
        Alamofire.request(urlString, withMethod: .get)
            .preValidate {
                responses.append("preValidate")
            }
            .validate()
            .postValidate {
                responses.append("postValidate")
            }
            .response { _, _, _, _ in
                responses.append("response")
                expectation.fulfill()
        }

        waitForExpectations(timeout: timeout, handler: nil)

        // Then
        if responses.count == 3 {
            XCTAssertEqual(responses[0], "preValidate", "response at index 0 should be preValidate")
            XCTAssertEqual(responses[1], "postValidate", "response at index 1 should be postValidate")
            XCTAssertEqual(responses[2], "response", "response at index 2 should be response")
        } else {
            XCTFail("responses count should be equal to 3")
        }
    }
}

// MARK: -

class RequestDescriptionTestCase: BaseTestCase {
    func testRequestDescription() {
        // Given
        let urlString = "https://httpbin.org/get"
        let request = Alamofire.request(urlString, withMethod: .get)
        let initialRequestDescription = request.description

        let expectation = self.expectation(description: "Request description should update: \(urlString)")

        var finalRequestDescription: String?
        var response: HTTPURLResponse?

        // When
        request.response { _, responseResponse, _, _ in
            finalRequestDescription = request.description
            response = responseResponse

            expectation.fulfill()
        }

        waitForExpectations(timeout: timeout, handler: nil)

        // Then
        XCTAssertEqual(initialRequestDescription, "GET https://httpbin.org/get", "incorrect request description")
        XCTAssertEqual(
            finalRequestDescription ?? "",
            "GET https://httpbin.org/get (\(response?.statusCode ?? -1))",
            "incorrect request description"
        )
    }
}

// MARK: -

class RequestDebugDescriptionTestCase: BaseTestCase {
    // MARK: Properties

    let manager: SessionManager = {
        let manager = SessionManager(configuration: .default)
        manager.startRequestsImmediately = false
        return manager
    }()

    let managerWithAcceptLanguageHeader: SessionManager = {
        var headers = SessionManager.default.session.configuration.httpAdditionalHeaders ?? [:]
        headers["Accept-Language"] = "en-US"

        let configuration = URLSessionConfiguration.default
        configuration.httpAdditionalHeaders = headers

        let manager = SessionManager(configuration: configuration)
        manager.startRequestsImmediately = false
        return manager
    }()

    let managerWithContentTypeHeader: SessionManager = {
        var headers = SessionManager.default.session.configuration.httpAdditionalHeaders ?? [:]
        headers["Content-Type"] = "application/json"

        let configuration = URLSessionConfiguration.default
        configuration.httpAdditionalHeaders = headers

        let manager = SessionManager(configuration: configuration)
        manager.startRequestsImmediately = false
        return manager
    }()

    let managerDisallowingCookies: SessionManager = {
        let configuration = URLSessionConfiguration.default
        configuration.httpShouldSetCookies = false

        let manager = SessionManager(configuration: configuration)
        manager.startRequestsImmediately = false

        return manager
    }()

    // MARK: Tests

    func testGETRequestDebugDescription() {
        // Given
        let urlString = "https://httpbin.org/get"

        // When
        let request = manager.request(urlString, withMethod: .get)
        let components = cURLCommandComponents(for: request)

        // Then
        XCTAssertEqual(components[0..<3], ["$", "curl", "-i"], "components should be equal")
        XCTAssertFalse(components.contains("-X"), "command should not contain explicit -X flag")
        XCTAssertEqual(components.last ?? "", "\"\(urlString)\"", "URL component should be equal")
    }

    func testGETRequestWithDuplicateHeadersDebugDescription() {
        // Given
        let urlString = "https://httpbin.org/get"

        // When
        let headers = [ "Accept-Language": "en-GB" ]
        let request = managerWithAcceptLanguageHeader.request(urlString, withMethod: .get, headers: headers)
        let components = cURLCommandComponents(for: request)

        // Then
        XCTAssertEqual(components[0..<3], ["$", "curl", "-i"], "components should be equal")
        XCTAssertFalse(components.contains("-X"), "command should not contain explicit -X flag")
        XCTAssertEqual(components.last ?? "", "\"\(urlString)\"", "URL component should be equal")

        let tokens = request.debugDescription.components(separatedBy: "Accept-Language:")
        XCTAssertTrue(tokens.count == 2, "command should contain a single Accept-Language header")

        XCTAssertTrue(
            request.debugDescription.range(of: "-H \"Accept-Language: en-GB\"") != nil,
            "command should Accept-Language set to 'en-GB'"
        )
    }

    func testPOSTRequestDebugDescription() {
        // Given
        let urlString = "https://httpbin.org/post"

        // When
        let request = manager.request(urlString, withMethod: .post)
        let components = cURLCommandComponents(for: request)

        // Then
        XCTAssertEqual(components[0..<3], ["$", "curl", "-i"], "components should be equal")
        XCTAssertEqual(components[3..<5], ["-X", "POST"], "command should contain explicit -X flag")
        XCTAssertEqual(components.last ?? "", "\"\(urlString)\"", "URL component should be equal")
    }

    func testPOSTRequestWithJSONParametersDebugDescription() {
        // Given
        let urlString = "https://httpbin.org/post"

        let parameters = [
            "foo": "bar",
            "fo\"o": "b\"ar",
            "f'oo": "ba'r"
        ]

        // When
        let request = manager.request(urlString, withMethod: .post, parameters: parameters, encoding: .json)
        let components = cURLCommandComponents(for: request)

        // Then
        XCTAssertEqual(components[0..<3], ["$", "curl", "-i"], "components should be equal")
        XCTAssertEqual(components[3..<5], ["-X", "POST"], "command should contain explicit -X flag")

        XCTAssertNotNil(request.debugDescription.range(of: "-H \"Content-Type: application/json\""), "command should contain Content-Type header")
        XCTAssertNotNil(request.debugDescription.range(of: "-d \"{"), "command should contain body parameter")
        XCTAssertNotNil(request.debugDescription.range(of: "\\\"f'oo\\\":\\\"ba'r\\\""), "command should contain JSON parameters")
        XCTAssertNotNil(request.debugDescription.range(of: "\\\"fo\\\\\\\"o\\\":\\\"b\\\\\\\"ar\\\""), "command should contain JSON parameters")
        XCTAssertNotNil(request.debugDescription.range(of: "\\\"foo\\\":\\\"bar\\"), "command should contain JSON parameters")

        XCTAssertEqual(components.last ?? "", "\"\(urlString)\"", "URL component should be equal")
    }

    func testPOSTRequestWithCookieDebugDescription() {
        // Given
        let urlString = "https://httpbin.org/post"

        let properties = [
            HTTPCookiePropertyKey.domain: "httpbin.org",
            HTTPCookiePropertyKey.path: "/post",
            HTTPCookiePropertyKey.name: "foo",
            HTTPCookiePropertyKey.value: "bar",
        ]

        let cookie = HTTPCookie(properties: properties)!
        manager.session.configuration.httpCookieStorage?.setCookie(cookie)

        // When
        let request = manager.request(urlString, withMethod: .post)
        let components = cURLCommandComponents(for: request)

        // Then
        XCTAssertEqual(components[0..<3], ["$", "curl", "-i"], "components should be equal")
        XCTAssertEqual(components[3..<5], ["-X", "POST"], "command should contain explicit -X flag")
        XCTAssertEqual(components.last ?? "", "\"\(urlString)\"", "URL component should be equal")
        XCTAssertEqual(components[5..<6], ["-b"], "command should contain -b flag")
    }

    func testPOSTRequestWithCookiesDisabledDebugDescription() {
        // Given
        let urlString = "https://httpbin.org/post"

        let properties = [
            HTTPCookiePropertyKey.domain: "httpbin.org",
            HTTPCookiePropertyKey.path: "/post",
            HTTPCookiePropertyKey.name: "foo",
            HTTPCookiePropertyKey.value: "bar",
        ]

        let cookie = HTTPCookie(properties: properties)!
        managerDisallowingCookies.session.configuration.httpCookieStorage?.setCookie(cookie)

        // When
        let request = managerDisallowingCookies.request(urlString, withMethod: .post)
        let components = cURLCommandComponents(for: request)

        // Then
        let cookieComponents = components.filter { $0 == "-b" }
        XCTAssertTrue(cookieComponents.isEmpty, "command should not contain -b flag")
    }

    func testMultipartFormDataRequestWithDuplicateHeadersDebugDescription() {
        // Given
        let urlString = "https://httpbin.org/post"
        let japaneseData = "日本語".data(using: String.Encoding.utf8, allowLossyConversion: false)!
        let expectation = self.expectation(description: "multipart form data encoding should succeed")

        var request: Request?
        var components: [String] = []

        // When
        managerWithContentTypeHeader.upload(
            multipartFormData: { multipartFormData in
                multipartFormData.append(japaneseData, withName: "japanese")
            },
            to: urlString,
            withMethod: .post,
            encodingCompletion: { result in
                switch result {
                case .success(let upload, _, _):
                    request = upload
                    components = self.cURLCommandComponents(for: upload)

                    expectation.fulfill()
                case .failure:
                    expectation.fulfill()
                }
            }
        )

        waitForExpectations(timeout: timeout, handler: nil)

        debugPrint(request!)

        // Then
        XCTAssertEqual(components[0..<3], ["$", "curl", "-i"], "components should be equal")
        XCTAssertTrue(components.contains("-X"), "command should contain explicit -X flag")
        XCTAssertEqual(components.last ?? "", "\"\(urlString)\"", "URL component should be equal")

        let tokens = request.debugDescription.components(separatedBy: "Content-Type:")
        XCTAssertTrue(tokens.count == 2, "command should contain a single Content-Type header")

        XCTAssertTrue(
            request.debugDescription.range(of: "-H \"Content-Type: multipart/form-data;") != nil,
            "command should contain Content-Type header starting with 'multipart/form-data;'"
        )
    }

    func testThatRequestWithInvalidURLDebugDescription() {
        // Given
        let urlString = "invalid_url"

        // When
        let request = manager.request(urlString, withMethod: .get)
        let debugDescription = request.debugDescription

        // Then
        XCTAssertNotNil(debugDescription, "debugDescription should not crash")
    }

    // MARK: Test Helper Methods

    private func cURLCommandComponents(for request: Request) -> [String] {
        let whitespaceCharacterSet = CharacterSet.whitespacesAndNewlines
        return request.debugDescription.components(separatedBy: whitespaceCharacterSet)
                                       .filter { $0 != "" && $0 != "\\" }
    }
}