Rename headers to .hpp (#1154)

Fixes #1153

src/rpc/JS.hpp

@@ -0,0 +1,33 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of clio: https://github.com/XRPLF/clio
+    Copyright (c) 2023, the clio developers.
+
+    Permission to use, copy, modify, and distribute this software for any
+    purpose with or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL,  DIRECT,  INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#pragma once
+
+#include "util/JsonUtils.hpp"
+
+#include <ripple/protocol/jss.h>
+
+/** @brief Helper macro for borrowing from ripple::jss static (J)son (S)trings. */
+#define JS(x) ripple::jss::x.c_str()
+
+/** @brief Access the lower case copy of a static (J)son (S)tring. */
+#define JSL(x) util::toLower(JS(x))
+
+/** @brief Provides access to (SF)ield name (S)trings. */
+#define SFS(x) ripple::x.jsonName.c_str()