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43 lines
1.5 KiB
43 lines
1.5 KiB
// Copyright (c) 2016, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#ifdef LUA
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// lua headers
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extern "C" {
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#include <lauxlib.h>
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#include <lua.h>
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#include <lualib.h>
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}
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namespace ROCKSDB_NAMESPACE {
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namespace lua {
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// A class that used to define custom C Library that is callable
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// from Lua script
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class RocksLuaCustomLibrary {
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public:
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virtual ~RocksLuaCustomLibrary() {}
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// The name of the C library. This name will also be used as the table
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// (namespace) in Lua that contains the C library.
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virtual const char* Name() const = 0;
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// Returns a "static const struct luaL_Reg[]", which includes a list of
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// C functions. Note that the last entry of this static array must be
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// {nullptr, nullptr} as required by Lua.
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//
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// More details about how to implement Lua C libraries can be found
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// in the official Lua document http://www.lua.org/pil/26.2.html
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virtual const struct luaL_Reg* Lib() const = 0;
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// A function that will be called right after the library has been created
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// and pushed on the top of the lua_State. This custom setup function
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// allows developers to put additional table or constant values inside
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// the same table / namespace.
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virtual void CustomSetup(lua_State* /*L*/) const {}
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};
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} // namespace lua
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} // namespace ROCKSDB_NAMESPACE
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#endif // LUA
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