[GitHub] [incubator-kvrocks] torwig commented on a diff in pull request #1120: Support more `HRANGE` options

[GitBox <gi...@apache.org>]

torwig commented on code in PR #1120:
URL: https://github.com/apache/incubator-kvrocks/pull/1120#discussion_r1022814766


##########
src/commands/redis_cmd.cc:
##########
@@ -1508,25 +1508,60 @@ class CommandHGetAll : public Commander {
 class CommandHRange : public Commander {
  public:
   Status Parse(const std::vector<std::string> &args) override {
-    if (args.size() != 6 && args.size() != 4) {
-      return Status(Status::RedisParseErr, errWrongNumOfArguments);
-    }
-    if (args.size() == 6 && Util::ToLower(args[4]) != "limit") {
-      return Status(Status::RedisInvalidCmd, errInvalidSyntax);
+    CommandParser parser(args, 4);
+    while (parser.Good()) {
+      if (parser.EatEqICaseFlag("BYLEX", by_flag_)) {
+      } else if (parser.EatEqICase("REV")) {
+        reversed_ = true;
+      } else if (parser.EatEqICase("LIMIT")) {
+        offset_ = GET_OR_RET(parser.TakeInt());
+        count_ = GET_OR_RET(parser.TakeInt());
+      } else {
+        return parser.InvalidSyntax();
+      }
     }
-    if (args.size() == 6) {
-      auto parse_result = ParseInt<int64_t>(args_[5], 10);
-      if (!parse_result) return Status(Status::RedisParseErr, errValueNotInteger);
-      limit_ = *parse_result;
+    if (by_flag_ == "BYLEX") {
+      spec_.reversed = reversed_;
+      spec_.count = count_;
+      spec_.offset = offset_;
+      Status s;
+      if (spec_.reversed) {
+        s = Redis::Hash::ParseRangeLexSpec(args[3], args[2], &spec_);
+      } else {
+        s = Redis::Hash::ParseRangeLexSpec(args[2], args[3], &spec_);
+      }
+      if (!s.IsOK()) {
+        return Status(Status::RedisParseErr, s.Msg());
+      }
+    } else {
+      by_flag_ = "BYINDEX";

Review Comment:
   @tanruixiang What do you mean by "the smallest element in a hash"?



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