parse range

Author: ucwong

cmd/cortex/chaincmd.go

@@ -21,8 +21,10 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"regexp"
 	"runtime"
 	"strconv"
+	"strings"
 	"sync/atomic"
 	"time"
 
@@ -532,3 +534,33 @@ func hashish(x string) bool {
 	_, err := strconv.Atoi(x)
 	return err != nil
 }
+
+func parseRange(s string) (start uint64, end uint64, ok bool) {
+	log.Info("Parsing block range", "input", s)
+	if m, _ := regexp.MatchString("^[0-9]+-[0-9]+$", s); m {
+		s1, s2, _ := strings.Cut(s, "-")
+		start, err := strconv.ParseUint(s1, 10, 64)
+		if err != nil {
+			return 0, 0, false
+		}
+		end, err = strconv.ParseUint(s2, 10, 64)
+		if err != nil {
+			return 0, 0, false
+		}
+		if start > end {
+			return 0, 0, false
+		}
+		log.Info("Parsing block range", "start", start, "end", end)
+		return start, end, true
+	}
+	if m, _ := regexp.MatchString("^[0-9]+$", s); m {
+		start, err := strconv.ParseUint(s, 10, 64)
+		if err != nil {
+			return 0, 0, false
+		}
+		end = start
+		log.Info("Parsing single block range", "block", start)
+		return start, end, true
+	}
+	return 0, 0, false
+}