cleaner testing, leveldb can sort and limit

db.go

@@ -2,6 +2,7 @@ package storage
 
 import (
 	"fmt"
+	"strconv"
 	"strings"
 )
 
@@ -62,16 +63,36 @@ func resolveNamespace(ns []string) string {
 }
 
 func resolveLimits(input []string) []string {
-	output := []string{"", ""}
-	if len(input) > 0 {
-		output[0] = input[0]
-	} else {
-		output[0] = " "
+	return []string{
+		resolveLimitsStart(input),
+		resolveLimitsStop(input),
+		resolveLimitsLimit(input),
+		resolveLimitsAscending(input),
 	}
-	if len(input) > 1 {
-		output[1] = input[1]
-	} else {
-		output[1] = "}}}}}}}}}}}}}"
-	}
-	return output[:]
+}
+
+func resolveLimitsStart(input []string) string {
+	if len(input) > 0 {
+		return input[0]
+	}
+	return " "
+}
+
+func resolveLimitsStop(input []string) string {
+	if len(input) > 1 {
+		return input[1]
+	}
+	return "}}}}}}"
+}
+
+func resolveLimitsLimit(input []string) string {
+	if len(input) > 2 {
+		v, _ := strconv.Atoi(input[2])
+		return strconv.Itoa(v)
+	}
+	return "0"
+}
+
+func resolveLimitsAscending(input []string) string {
+	return strconv.FormatBool(len(input) < 4 || input[3] != "-")
 }