Fix parsing bug and implement categories

Sources/iCalendarParser/Constant/Constant.swift

@@ -65,6 +65,7 @@ extension Constant {
         static let cname = "CN"
 
         static let attachment: String = "ATTACH"
+        static let categories: String = "CATEGORIES"
         static let created: String = "CREATED"
         static let classification: String = "CLASS"
         static let description: String = "DESCRIPTION"

Sources/iCalendarParser/Models/ICEvent.swift

@@ -23,7 +23,7 @@ public struct ICEvent: ICComponentable {
     // https://www.rfc-editor.org/rfc/rfc5545#section-3.8.1.1))
     // var attachment: [ICAttachment]?
 
-    // var categories: [String]?
+    var categories: [String]?
 
     /// Defines the access classification for a calendar component.
     ///
@@ -195,6 +195,7 @@ public struct ICEvent: ICComponentable {
 
     public init(
         attendees: [ICAttendee]? = nil,
+        categories: [String]? = nil,
         classification: String? = nil,
         description: String? = nil,
         dtCreated: Date? = nil,
@@ -215,6 +216,7 @@ public struct ICEvent: ICComponentable {
         url: URL? = nil
     ) {
         self.attendees = attendees
+        self.categories = categories
         self.classification = classification
         self.description = description
         self.dtCreated = dtCreated

Sources/iCalendarParser/Parser/ICParser.swift

@@ -60,22 +60,29 @@ public struct ICParser {
         )
     }
 
-    func getProperties(
-        from ics: String
-    ) -> [ICProperty] {
-        return ics
-            .replacingOccurrences(of: "\r\n ", with: "")
-            .components(separatedBy: "\r\n")
+    func getProperties(from ics: String) -> [ICProperty] {
+        // Normalize line endings to \n
+        let normalizedICS = ics
+            .replacingOccurrences(of: "\r\n", with: "\n")
+            .replacingOccurrences(of: "\r", with: "\n")
+        // Replace line folding sequences
+        let unfoldedICS = normalizedICS.replacingOccurrences(of: "\n ", with: "")
+
+        // Split by \n
+        let properties: [ICProperty] = unfoldedICS
+            .components(separatedBy: "\n")
             .map { $0.split(separator: ":", maxSplits: 1, omittingEmptySubsequences: true) }
             .filter { $0.count > 1 }
             .map { (String($0[0]), String($0[1])) }
+
+        return properties
     }
 
     private func getProperty(
         name: String,
         from elements: [ICProperty]
     ) -> ICProperty? {
-        return elements
+        elements
             .filter { $0.name.hasPrefix(name) }
             .first
     }
@@ -144,6 +151,7 @@ public struct ICParser {
             var event = ICEvent()
 
             event.attendees = component.buildAttendees(of: Constant.Property.attendee)
+            event.categories = component.buildProperty(of: Constant.Property.categories)?.components(separatedBy: ",")
             event.classification = component.buildProperty(of: Constant.Property.classification)
             event.description = component.buildProperty(of: Constant.Property.description)
             event.dtCreated = component.buildProperty(of: Constant.Property.created)?.date

Tests/iCalendarParserTests/Extensions/XCTestCase+Extension.swift

@@ -0,0 +1,36 @@
+//
+//  XCTestCase+Extension.swift
+//
+//
+//  Created by Adrian Bolinger on 7/28/24.
+//
+
+import XCTest
+
+extension XCTestCase {
+    /// Reads the contents of a file located in the test directory's "Resources" folder.
+    ///
+    /// - Parameters:
+    ///   - filename: The name of the file (without extension).
+    ///   - ext: The extension of the file.
+    /// - Returns: The contents of the file as a String.
+    /// - Throws: An error if the file cannot be read.
+    func getContents(of filename: String, ext: String, file: StaticString = #filePath) throws -> String {
+        // Get the directory of the current file
+        let currentFilePath = String(describing: file)
+        let currentDirectoryPath = URL(fileURLWithPath: currentFilePath).deletingLastPathComponent()
+
+        // Construct the full file path
+        let fileURL = currentDirectoryPath.appendingPathComponent("Resources/\(filename).\(ext)")
+
+        // Ensure the file exists
+        guard FileManager.default.fileExists(atPath: fileURL.path) else {
+            throw NSError(domain: "FileNotFoundError", code: 1, userInfo: [NSLocalizedDescriptionKey: "File \(filename).\(ext) not found at path \(fileURL.path)."])
+        }
+
+        // Read the contents of the file
+        let fileContents = try String(contentsOf: fileURL, encoding: .utf8)
+
+        return fileContents
+    }
+}

Tests/iCalendarParserTests/ICParserTests.swift

@@ -0,0 +1,50 @@
+//
+//  ICParserTests.swift
+//  
+//
+//  Created by Adrian Bolinger on 7/28/24.
+//
+
+import XCTest
+
+@testable import iCalendarParser
+
+final class ICParserTests: XCTestCase {
+
+    var sut: ICParser!
+
+    override func setUpWithError() throws {
+        try super.setUpWithError()
+        sut = ICParser()
+    }
+
+    override func tearDownWithError() throws {
+        sut = nil
+        try super.tearDownWithError()
+    }
+
+    func testICParser() throws {
+        let iCalString = try getContents(of: "uf-full-calendar", ext: "txt")
+        let calendar = sut.calendar(from: iCalString)
+        XCTAssertEqual(calendar?.events.count, 295)
+    }
+
+    func testICParserCategories() throws {
+        let iCalString = try getContents(of: "ufl-all-events", ext: "txt")
+        guard let calendar = sut.calendar(from: iCalString) else {
+            XCTFail("could not create calendar")
+            return
+        }
+
+        let uniqueCategories = calendar.events
+            .compactMap { $0.categories }
+            .flatMap { $0 }
+            .reduce(into: [String]()) { result, category in
+                if !result.contains(category) {
+                    result.append(category)
+                }
+            }
+
+        XCTAssertEqual(uniqueCategories.count, 19)
+    }
+}