Data commit

Task/Range-expansion/Go/range-expansion.go

@@ -0,0 +1,64 @@
+package main
+
+import (
+    "fmt"
+    "strconv"
+    "strings"
+)
+
+const input = "-6,-3--1,3-5,7-11,14,15,17-20"
+
+func main() {
+    fmt.Println("range:", input)
+    var r []int
+    var last int
+    for _, part := range strings.Split(input, ",") {
+        if i := strings.Index(part[1:], "-"); i == -1 {
+            n, err := strconv.Atoi(part)
+            if err != nil {
+                fmt.Println(err)
+                return
+            }
+            if len(r) > 0 {
+                if last == n {
+                    fmt.Println("duplicate value:", n)
+                    return
+                } else if last > n {
+                    fmt.Println("values not ordered:", last, ">", n)
+                    return
+                }
+            }
+            r = append(r, n)
+            last = n
+        } else {
+            n1, err := strconv.Atoi(part[:i+1])
+            if err != nil {
+                fmt.Println(err)
+                return
+            }
+            n2, err := strconv.Atoi(part[i+2:])
+            if err != nil {
+                fmt.Println(err)
+                return
+            }
+            if n2 < n1+2 {
+                fmt.Println("invalid range:", part)
+                return
+            }
+            if len(r) > 0 {
+                if last == n1 {
+                    fmt.Println("duplicate value:", n1)
+                    return
+                } else if last > n1 {
+                    fmt.Println("values not ordered:", last, ">", n1)
+                    return
+                }
+            }
+            for i = n1; i <= n2; i++ {
+                r = append(r, i)
+            }
+            last = n2
+        }
+    }
+    fmt.Println("expanded:", r)
+}