Data commit

Task/Text-processing-1/Swift/text-processing-1.swift

@@ -0,0 +1,80 @@
+import Foundation
+
+let fmtDbl = { String(format: "%10.3f", $0) }
+
+Task.detached {
+  let formatter = DateFormatter()
+
+  formatter.dateFormat = "yyyy-MM-dd"
+
+  let (data, _) = try await URLSession.shared.bytes(from: URL(fileURLWithPath: CommandLine.arguments[1]))
+  var rowStats = [(Date, Double, Int)]()
+  var invalidPeriods = 0
+  var invalidStart: Date?
+  var sumFile = 0.0
+  var readings = 0
+  var longestInvalid = 0
+  var longestInvalidStart: Date?
+  var longestInvalidEnd: Date?
+
+  for try await line in data.lines {
+    let lineSplit = line.components(separatedBy: "\t")
+
+    guard !lineSplit.isEmpty, let date = formatter.date(from: lineSplit[0]) else {
+      fatalError("Invalid date \(lineSplit[0])")
+    }
+
+    let data = Array(lineSplit.dropFirst())
+    let parsed = stride(from: 0, to: data.endIndex, by: 2).map({idx -> (Double, Int) in
+      let slice = data[idx..<idx+2]
+
+      return (Double(slice[idx]) ?? 0, Int(slice[idx+1]) ?? 0)
+    })
+
+    var sum = 0.0
+    var numValid = 0
+
+    for (val, flag) in parsed {
+      if flag <= 0 {
+        if invalidStart == nil {
+          invalidStart = date
+        }
+
+        invalidPeriods += 1
+      } else {
+        if invalidPeriods > longestInvalid {
+          longestInvalid = invalidPeriods
+          longestInvalidStart = invalidStart
+          longestInvalidEnd = date
+        }
+
+        sumFile += val
+        sum += val
+        numValid += 1
+        readings += 1
+        invalidPeriods = 0
+        invalidStart = nil
+      }
+    }
+
+    if numValid != 0 {
+      rowStats.append((date, sum / Double(numValid), parsed.count - numValid))
+    }
+  }
+
+  for stat in rowStats.lazy.reversed().prefix(5) {
+    print("\(stat.0): Average: \(fmtDbl(stat.1)); Valid Readings: \(24 - stat.2); Invalid Readings: \(stat.2)")
+  }
+
+  print("""
+
+        Sum File: \(fmtDbl(sumFile))
+        Average: \(fmtDbl(sumFile / Double(readings)))
+        Readings: \(readings)
+        Longest Invalid: \(longestInvalid) (\(longestInvalidStart!) - \(longestInvalidEnd!))
+        """)
+
+  exit(0)
+}
+
+dispatchMain()