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/**
* @file llluamanager.h
* @brief classes and functions for interfacing with LUA.
*
* $LicenseInfo:firstyear=2023&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2023, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef LL_LLLUAMANAGER_H
#define LL_LLLUAMANAGER_H
#include "fsyspath.h"
#include "llcoros.h"
#include "llsd.h"
#include <functional>
#include <string>
#include <utility> // std::pair
#include "luau/lua.h"
#include "luau/lualib.h"
class LuaState;
class LLLUAmanager
{
friend class ScriptObserver;
public:
// Pass a callback with this signature to obtain the error message, if
// any, from running a script or source string. Empty msg means success.
typedef std::function<void(std::string msg)> script_finished_fn;
// Pass a callback with this signature to obtain the result, if any, of
// running a script or source string.
// count < 0 means error, and result.asString() is the error message.
// count == 0 with result.isUndefined() means the script returned no results.
// count == 1 means the script returned one result.
// count > 1 with result.isArray() means the script returned multiple
// results, represented as the entries of the result array.
typedef std::function<void(int count, const LLSD& result)> script_result_fn;
// same semantics as script_result_fn parameters
typedef std::pair<int, LLSD> script_result;
static void runScriptFile(const std::string &filename, script_result_fn result_cb = {},
script_finished_fn finished_cb = {});
// Start running a Lua script file, returning an LLCoros::Future whose
// get() method will pause the calling coroutine until it can deliver the
// (count, result) pair described above. Between startScriptFile() and
// Future::get(), the caller and the Lua script coroutine will run
// concurrently.
static LLCoros::Future<script_result> startScriptFile(const std::string& filename);
// Run a Lua script file, and pause the calling coroutine until it completes.
// The return value is the (count, result) pair described above.
static script_result waitScriptFile(const std::string& filename);
static void runScriptLine(const std::string &chunk, script_result_fn result_cb = {},
script_finished_fn finished_cb = {});
// Start running a Lua chunk, returning an LLCoros::Future whose
// get() method will pause the calling coroutine until it can deliver the
// (count, result) pair described above. Between startScriptLine() and
// Future::get(), the caller and the Lua script coroutine will run
// concurrently.
static LLCoros::Future<script_result> startScriptLine(const std::string& chunk);
// Run a Lua chunk, and pause the calling coroutine until it completes.
// The return value is the (count, result) pair described above.
static script_result waitScriptLine(const std::string& chunk);
static const std::map<std::string, std::string> getScriptNames() { return sScriptNames; }
private:
static std::map<std::string, std::string> sScriptNames;
};
class LLRequireResolver
{
public:
static void resolveRequire(lua_State *L, std::string path);
private:
fsyspath mPathToResolve;
fsyspath mSourceDir;
LLRequireResolver(lua_State *L, const std::string& path);
void findModule();
lua_State *L;
bool findModuleImpl(const std::string& absolutePath);
void runModule(const std::string& desc, const std::string& code);
};
// RAII class to guarantee that a script entry is erased even when coro is terminated
class ScriptObserver
{
public:
ScriptObserver(const std::string &coro_name, const std::string &filename) : mCoroName(coro_name)
{
LLLUAmanager::sScriptNames[mCoroName] = filename;
}
~ScriptObserver() { LLLUAmanager::sScriptNames.erase(mCoroName); }
private:
std::string mCoroName;
};
#endif
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