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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* liblua_wrapper.cc
*
* Mon Aug 14 17:36:03 CEST 2006
* Copyright 2006 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of MIaV.
*
* MIaV is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MIaV 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with MIaV; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "liblua_wrapper.h"
#include <stdexcept>
LibLUAWrapper::LibLUAWrapper()
{
L = lua_open();
// luaL_openlibs(L);
}
LibLUAWrapper::~LibLUAWrapper()
{
lua_close(L);
}
int LibLUAWrapper::loadFile(const char *fname)
{
int s;
s = luaL_loadfile(L, fname);
switch(s) {
case 0: //no errors;
break;
case LUA_ERRSYNTAX: //syntax error during pre-compilation;
case LUA_ERRMEM: //memory allocation error.
case LUA_ERRFILE: //cannot open/read the file.
strerr = std::string(lua_tostring(L, lua_gettop(L)));
return 1;
default:
strerr = std::string("Unknown return value of luaL_loadfile.");
return 1;
}
s = lua_pcall(L, 0, LUA_MULTRET, 0);
switch(s) {
case 0: // Success
break;
case LUA_ERRRUN:// a runtime error.
case LUA_ERRMEM:// memory allocation error. For such errors, Lua does not call the error handler function.
case LUA_ERRERR:// error while running the error handler function.
strerr = std::string(lua_tostring(L, lua_gettop(L)));
return 1;
default:
strerr = std::string("Unknown return value of lua_pcall.");
return 1;
}
return 0;
}
int LibLUAWrapper::loadBuffer(char *buffer)
{
int s;
s = luaL_loadstring(L, buffer);
switch(s) {
case 0: //no errors;
break;
case LUA_ERRSYNTAX: //syntax error during pre-compilation;
case LUA_ERRMEM: //memory allocation error.
strerr = std::string(lua_tostring(L, lua_gettop(L)));
return 1;
default:
strerr = std::string("Unknown return value of luaL_loadstring.");
return 1;
}
s = lua_pcall(L, 0, LUA_MULTRET, 0);
switch(s) {
case 0: // Success
break;
case LUA_ERRRUN:// a runtime error.
case LUA_ERRMEM:// memory allocation error. For such errors, Lua does not call the error handler function.
case LUA_ERRERR:// error while running the error handler function.
strerr = std::string(lua_tostring(L, lua_gettop(L)));
return 1;
default:
strerr = std::string("Unknown return value of lua_pcall.");
return 1;
}
return 0;
}
int LibLUAWrapper::getInteger(const char *name)
{
lua_getfield(L, LUA_GLOBALSINDEX, name);
int top = lua_gettop(L);
int val = lua_tointeger(L, top);
lua_remove(L, top);
return val;
}
double LibLUAWrapper::getReal(const char *name)
{
lua_getfield(L, LUA_GLOBALSINDEX, name);
int top = lua_gettop(L);
double val = lua_tonumber(L, top);
lua_remove(L, top);
return val;
}
bool LibLUAWrapper::getBoolean(const char *name)
{
lua_getfield(L, LUA_GLOBALSINDEX, name);
int top = lua_gettop(L);
bool val = lua_toboolean(L, top);
lua_remove(L, top);
return val;
}
std::string LibLUAWrapper::getString(const char *name)
{
lua_getfield(L, LUA_GLOBALSINDEX, name);
int top = lua_gettop(L);
std::string val = std::string(lua_tostring(L, top));
lua_remove(L, top);
return val;
}
std::string LibLUAWrapper::error()
{
return strerr;
}
#ifdef LUA_TEST
// Compile with:
// g++ liblua_wrapper.cc -DLUA_TEST -I /home/deva/lib/lua-5.1.1/include/ -L /home/deva/lib/lua-5.1.1/lib -llua
const char preload[] =
"a = 42.0\n"
"b = 42\n"
"c = 42\n"
"d = \"42\"\n";
int main()
{
LibLUAWrapper lua;
if(lua.loadBuffer((char*)preload)) {
fprintf(stderr, "LUA buffer error: %s\n", lua.error().c_str());
return 1;
}
if(lua.loadFile("test.lua")) {
fprintf(stderr, "LUA load error: %s\n", lua.error().c_str());
return 1;
}
printf("a: %f\n", lua.getReal("a"));
printf("b: %d\n", lua.getInteger("b"));
printf("c: %d\n", lua.getBoolean("c"));
printf("d: %s\n", lua.getString("d").c_str());
return 0;
}
#endif
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