refactor: rpc: hide and rename ParseNonRFCJSONValue()

As per bitcoin/bitcoin#26506 (review),
this function is no longer necessary and we can use UniValue::read() directly.

To avoid code duplication, we keep the function to throw on invalid input data
but rename it to Parse() and remove it from the header.

Author: stickies-v

src/rpc/client.cpp

@@ -222,6 +222,14 @@ static const CRPCConvertParam vRPCConvertParams[] =
 };
 // clang-format on
 
+/** Parse string to UniValue or throw runtime_error if string contains invalid JSON */
+static UniValue Parse(std::string_view raw)
+{
+    UniValue parsed;
+    if (!parsed.read(raw)) throw std::runtime_error(tfm::format("Error parsing JSON: %s", raw));
+    return parsed;
+}
+
 class CRPCConvertTable
 {
 private:
@@ -234,13 +242,13 @@ class CRPCConvertTable
     /** Return arg_value as UniValue, and first parse it if it is a non-string parameter */
     UniValue ArgToUniValue(std::string_view arg_value, const std::string& method, int param_idx)
     {
-        return members.count({method, param_idx}) > 0 ? ParseNonRFCJSONValue(arg_value) : arg_value;
+        return members.count({method, param_idx}) > 0 ? Parse(arg_value) : arg_value;
     }
 
     /** Return arg_value as UniValue, and first parse it if it is a non-string parameter */
     UniValue ArgToUniValue(std::string_view arg_value, const std::string& method, const std::string& param_name)
     {
-        return membersByName.count({method, param_name}) > 0 ? ParseNonRFCJSONValue(arg_value) : arg_value;
+        return membersByName.count({method, param_name}) > 0 ? Parse(arg_value) : arg_value;
     }
 };
 
@@ -254,16 +262,6 @@ CRPCConvertTable::CRPCConvertTable()
 
 static CRPCConvertTable rpcCvtTable;
 
-/** Non-RFC4627 JSON parser, accepts internal values (such as numbers, true, false, null)
- * as well as objects and arrays.
- */
-UniValue ParseNonRFCJSONValue(std::string_view raw)
-{
-    UniValue parsed;
-    if (!parsed.read(raw)) throw std::runtime_error(tfm::format("Error parsing JSON: %s", raw));
-    return parsed;
-}
-
 UniValue RPCConvertValues(const std::string &strMethod, const std::vector<std::string> &strParams)
 {
     UniValue params(UniValue::VARR);

src/rpc/client.h

@@ -17,9 +17,4 @@ UniValue RPCConvertValues(const std::string& strMethod, const std::vector<std::s
 /** Convert named arguments to command-specific RPC representation */
 UniValue RPCConvertNamedValues(const std::string& strMethod, const std::vector<std::string>& strParams);
 
-/** Non-RFC4627 JSON parser, accepts internal values (such as numbers, true, false, null)
- * as well as objects and arrays.
- */
-UniValue ParseNonRFCJSONValue(std::string_view raw);
-
 #endif // BITCOIN_RPC_CLIENT_H