all tasks

Task/Text-processing-2/Go/text-processing-2.go

@@ -0,0 +1,81 @@
+package main
+
+import (
+    "bufio"
+    "fmt"
+    "io"
+    "os"
+    "strconv"
+    "strings"
+)
+
+var fn = "readings.txt"
+
+func main() {
+    f, err := os.Open(fn)
+    if err != nil {
+        fmt.Println(err)
+        return
+    }
+    defer f.Close()
+    var allGood, uniqueGood int
+    // map records not only dates seen, but also if an all-good record was
+    // seen for the key date.
+    m := make(map[string]bool)
+    for lr := bufio.NewReader(f); ; {
+        line, pref, err := lr.ReadLine()
+        if err == io.EOF {
+            break
+        }
+        if err != nil {
+            fmt.Println(err)
+            return
+        }
+        if pref {
+            fmt.Println("Unexpected long line.")
+            return
+        }
+        f := strings.Fields(string(line))
+        if len(f) != 49 {
+            fmt.Println("unexpected format,", len(f), "fields.")
+            return
+        }
+        good := true
+        for i := 1; i < 49; i += 2 {
+            flag, err := strconv.Atoi(f[i+1])
+            if err != nil {
+                fmt.Println(err)
+                return
+            }
+            if flag > 0 { // value is good
+                _, err := strconv.ParseFloat(f[i], 64)
+                if err != nil {
+                    fmt.Println(err)
+                    return
+                }
+            } else { // value is bad
+                good = false
+            }
+        }
+        if good {
+            allGood++
+        }
+        previouslyGood, seen := m[f[0]]
+        if seen {
+            fmt.Println("Duplicate datestamp:", f[0])
+            if !previouslyGood && good {
+                m[string([]byte(f[0]))] = true
+                uniqueGood++
+            }
+        } else {
+            m[string([]byte(f[0]))] = good
+            if good {
+                uniqueGood++
+            }
+        }
+    }
+    fmt.Println("\nData format valid.")
+    fmt.Println(allGood, "records with good readings for all instruments.")
+    fmt.Println(uniqueGood,
+        "unique dates with good readings for all instruments.")
+}