feat: Initial csv parsing for uploading rooms for a project. Need to style the upload form.

Sources/CSVParser/Interface.swift

@@ -0,0 +1,43 @@
+import Dependencies
+import DependenciesMacros
+import ManualDCore
+import Parsing
+
+extension DependencyValues {
+  public var csvParser: CSVParser {
+    get { self[CSVParser.self] }
+    set { self[CSVParser.self] = newValue }
+  }
+}
+
+@DependencyClient
+public struct CSVParser: Sendable {
+  public var parseRooms: @Sendable (Room.CSV) async throws -> [Room.Create]
+}
+
+extension CSVParser: DependencyKey {
+  public static let testValue = Self()
+
+  public static let liveValue = Self(
+    parseRooms: { csv in
+      guard let string = String(data: csv.file, encoding: .utf8) else {
+        throw CSVParsingError("Unreadable file data")
+      }
+      let rows = try RoomCSVParser().parse(string[...].utf8)
+      let rooms = rows.reduce(into: [Room.Create]()) {
+        if case .room(let room) = $1 {
+          $0.append(room)
+        }
+      }
+      return rooms
+    }
+  )
+}
+
+public struct CSVParsingError: Error {
+  let reason: String
+
+  public init(_ reason: String) {
+    self.reason = reason
+  }
+}

Sources/CSVParser/Internal/Room+parsing.swift

@@ -0,0 +1,51 @@
+import ManualDCore
+import Parsing
+
+struct RoomCSVParser: Parser {
+  var body: some Parser<Substring.UTF8View, [RoomRowType]> {
+    Many {
+      RoomRowParser()
+    } separator: {
+      "\n".utf8
+    }
+  }
+}
+
+struct RoomRowParser: Parser {
+
+  var body: some Parser<Substring.UTF8View, RoomRowType> {
+    OneOf {
+      RoomCreateParser().map { RoomRowType.room($0) }
+      Prefix { $0 != UInt8(ascii: "\n") }
+        .map(.string)
+        .map { RoomRowType.header($0) }
+    }
+  }
+}
+
+enum RoomRowType {
+  case header(String)
+  case room(Room.Create)
+}
+
+struct RoomCreateParser: ParserPrinter {
+
+  var body: some ParserPrinter<Substring.UTF8View, Room.Create> {
+    ParsePrint {
+      Prefix { $0 != UInt8(ascii: ",") }.map(.string)
+      ",".utf8
+      Double.parser()
+      ",".utf8
+      Optionally {
+        Double.parser()
+      }
+      ",".utf8
+      Optionally {
+        Double.parser()
+      }
+      ",".utf8
+      Int.parser()
+    }
+    .map(.memberwise(Room.Create.init))
+  }
+}