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#include "LuaVM.hpp"
#include "StringUtils.hpp"
#include <stdexcept>
#include <sstream>
#include <iostream>
#include <string>
using namespace std;
LuaVM::LuaVM( ) : m_lua( 0 )
{
initialize( );
}
LuaVM::~LuaVM( )
{
lua_close( m_lua );
}
lua_State *LuaVM::handle( )
{
return m_lua;
}
void LuaVM::initialize( )
{
m_lua = luaL_newstate( );
luaL_openlibs( m_lua );
}
void LuaVM::fullGarbageCollect( )
{
lua_gc( m_lua, LUA_GCCOLLECT, 0 );
}
void LuaVM::loadSource( const char *sourceFilename )
{
int res;
m_sourceFilename.assign( sourceFilename );
res = luaL_loadfile( m_lua, m_sourceFilename.c_str( ) );
if( res != 0 ) {
ostringstream ss;
ss << "Can't read Lua source file from file '" << m_sourceFilename << "': " << lua_tostring( m_lua, -1 );
lua_pop( m_lua, 1 );
throw std::runtime_error( ss.str( ) );
}
}
void LuaVM::executeMain( )
{
int res = lua_pcall( m_lua, 0, 0, 0 );
if( res != 0 ) {
ostringstream ss;
ss << "Can't execute main body of Lua source file '" << m_sourceFilename << "': " << lua_tostring( m_lua, -1 );
lua_pop( m_lua, 1 );
throw std::runtime_error( ss.str( ) );
}
}
void LuaVM::executeFunction( const string &f )
{
//int top = lua_gettop( m_lua );
lua_getglobal( m_lua, f.c_str( ) );
int res = lua_pcall( m_lua, 0, LUA_MULTRET, 0 );
if( res != 0 ) {
ostringstream ss;
ss << "Unable to call Lua function '" << f << "': " << lua_tostring( m_lua, -1 );
lua_pop( m_lua, 1 );
throw new std::runtime_error( ss.str( ) );
}
//int nresults = lua_gettop( m_lua ) - top;
// TODO: return results
}
void LuaVM::dumpState( )
{
lua_rawgeti( m_lua, LUA_REGISTRYINDEX, LUA_RIDX_GLOBALS );
lua_pushnil( m_lua );
while( lua_next( m_lua, -2 ) ) {
if( lua_type( m_lua, -2 ) == LUA_TSTRING ) {
cout << lua_tostring( m_lua, -2 ) << endl;
}
lua_pop( m_lua, 1 );
}
}
string LuaVM::getString( const string &key )
{
vector<string> parts = split( key, "." );
string res;
if( parts.size( ) == 1 ) {
lua_getglobal( m_lua, parts[0].c_str( ) );
if( lua_isnil( m_lua, -1 ) ) {
lua_pop( m_lua, 1 );
return "";
}
res = lua_tostring( m_lua, -1 );
lua_pop( m_lua, 1 );
return res;
}
lua_getglobal( m_lua, parts[0].c_str( ) );
for( size_t i = 1; i <= parts.size( ) - 1; i++ ) {
if( !lua_istable( m_lua, -1 ) ) {
lua_pop( m_lua, i );
ostringstream ss;
ss << "table expected in '" << key << "' when derefencing field '" << parts[i] << "'";
throw runtime_error( ss.str( ) );
}
lua_getfield( m_lua, -1, parts[i].c_str( ) );
}
if( lua_isnil( m_lua, -1 ) ) {
lua_pop( m_lua, parts.size( ) );
ostringstream ss;
ss << "key '" << key << "' refers to an empty element";
throw runtime_error( ss.str( ) );
}
res = lua_tostring( m_lua, -1 );
lua_pop( m_lua, parts.size( ) );
return res;
}
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