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/*
* Copyright (c) 2009-2017, Albertas Vyšniauskas
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
* * Neither the name of the software author nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "Script.h"
#include <sstream>
extern "C"{
#include <lualib.h>
#include <lauxlib.h>
}
#include <iostream>
using namespace std;
namespace lua
{
Script::Script()
{
m_state = luaL_newstate();
m_state_owned = true;
luaL_openlibs(m_state);
}
Script::Script(lua_State *state)
{
m_state = state;
m_state_owned = false;
}
Script::~Script()
{
if (m_state_owned)
lua_close(m_state);
m_state = nullptr;
}
Script::operator lua_State*()
{
return m_state;
}
void Script::setPaths(const std::vector<std::string> &include_paths)
{
string paths = ";./?.lua;";
for (vector<string>::const_iterator i = include_paths.begin(); i != include_paths.end(); i++){
paths += *i;
paths += "/?.lua;";
}
lua_getglobal(m_state, "package");
lua_pushstring(m_state, "path");
lua_pushstring(m_state, paths.c_str());
lua_settable(m_state, -3);
lua_pop(m_state, 1);
}
bool Script::load(const char *script_name)
{
int status;
lua_getglobal(m_state, "require");
lua_pushstring(m_state, script_name);
status = lua_pcall(m_state, 1, 1, 0);
if (status) {
stringstream ss;
ss << lua_tostring(m_state, -1);
m_last_error = ss.str();
return false;
}
return true;
}
bool Script::loadCode(const char *script_code)
{
int status;
status = luaL_loadstring(m_state, script_code);
if (status){
m_last_error = lua_tostring(m_state, -1);
return false;
}
return true;
}
bool Script::run(int arguments_on_stack, int results)
{
lua_State *L = m_state;
int status;
if (lua_type(L, -1) != LUA_TNIL){
if ((status = lua_pcall(L, arguments_on_stack, results, 0))){
stringstream ss;
ss << "call failed: " << lua_tostring(L, -1);
m_last_error = ss.str();
return false;
}else{
return true;
}
}else{
m_last_error = "requested function was not found";
return false;
}
}
static int registerLuaPackage(lua_State *L)
{
lua_getglobal(L, "__script");
auto &script = *reinterpret_cast<Script*>(lua_touserdata(L, -1));
lua_getglobal(L, "__extension");
auto &extension = *reinterpret_cast<function<int(Script &)>*>(lua_touserdata(L, -1));
lua_pop(L, 2);
return extension(script);
}
bool Script::registerExtension(const char *name, std::function<int(Script &)> extension)
{
lua_State *L = m_state;
string full_name;
if (name == nullptr)
full_name = "gpick";
else
full_name = string("gpick/") + name;
lua_pushlightuserdata(L, this);
lua_setglobal(L, "__script");
lua_pushlightuserdata(L, &extension);
lua_setglobal(L, "__extension");
luaL_requiref(m_state, full_name.c_str(), registerLuaPackage, 0);
lua_pushnil(L);
lua_setglobal(L, "__script");
lua_pushnil(L);
lua_setglobal(L, "__extension");
lua_pop(L, 1);
return true;
}
std::string Script::getString(int index)
{
return lua_tostring(m_state, index);
}
void Script::createType(const char *name, const luaL_Reg *members)
{
lua_State *L = m_state;
luaL_newmetatable(L, name);
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
luaL_setfuncs(L, members, 0);
lua_pop(L, 1);
}
const std::string &Script::getLastError()
{
return m_last_error;
}
}
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