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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* luaquerymapper.cc
*
* Mon May 5 15:43:52 CEST 2008
* Copyright 2008 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of Pracro.
*
* Pracro 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.
*
* Pracro 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 Pracro; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "luaquerymapper.h"
#include <sstream>
static std::string loadresultstring(QueryResult &res, std::string group = "")
{
std::string s;
std::stringstream timestamp; timestamp << res.timestamp;
std::map< std::string, std::string >::iterator v = res.values.begin();
while(v != res.values.end()) {
s += group + (*v).first + " = {}\n";
s += group + (*v).first + ".value = \"" + (*v).second + "\"\n";
s += group + (*v).first + ".timestamp = " + timestamp.str() + "\n";
v++;
}
std::map< std::string, QueryResult >::iterator g = res.groups.begin();
while(g != res.groups.end()) {
s += group + (*g).first + " = {}\n";
s += loadresultstring((*g).second, group + (*g).first + ".");
g++;
}
return s;
}
LUAQueryMapper::LUAQueryMapper(QueryResult &res)
{
L = luaL_newstate();
if(L == NULL) {
// throw LUADataParserException("Could not create LUA state.");
}
luaL_openlibs(L);
std::string preload = loadresultstring(res);
int s = luaL_loadbuffer(L, preload.c_str(), preload.size(), "preload");
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.
//throw LUADataParserException(lua_tostring(L, lua_gettop(L)));
break;
default:
//throw LUADataParserException("Unknown return value of luaL_loadfile.");
break;
}
// Run program (init)
lua_pcall(L, 0, LUA_MULTRET, 0);
clean_top = lua_gettop(L);
}
LUAQueryMapper::~LUAQueryMapper()
{
lua_close(L);
}
Value LUAQueryMapper::map(const std::string &mapper)
{
Value v;
if(mapper == "") {
printf("Empty LUA mapper detected!\n");
v.timestamp = 0;
v.value = "";
}
int s = luaL_loadbuffer(L, mapper.c_str(), mapper.size(), "mapper");
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.
//throw LUADataParserException(lua_tostring(L, lua_gettop(L)));
break;
default:
//throw LUADataParserException("Unknown return value of luaL_loadfile.");
break;
}
// Run the loaded code
lua_pcall(L, 0, LUA_MULTRET, 0);
// Check if app messed up the stack.
if(lua_gettop(L) != clean_top) {
printf("LUA mapper messed up the stack (wrong number of return values)!\n");
lua_pop(L, lua_gettop(L) - clean_top);
Value v;
v.timestamp = 0;
v.value = "";
return v;
}
v.timestamp = lua_tointeger(L, lua_gettop(L));
lua_pop(L, 1);
v.value = lua_tostring(L, lua_gettop(L));
lua_pop(L, 1);
return v;
}
#ifdef TEST_LUAQUERYMAPPER
#include "queryhandler.h"
#include "queryparser.h"
int main()
{
TCPSocket s;
s.connect("localhost", 11108);
QueryHandler qh(&s, "2003791613");
Query q1;
q1.attributes["device_id"] = "lensmeter";
q1.attributes["device_type"] = "lensmeter";
std::string res = qh.exec();
printf("%s\n", res.c_str());
QueryParser e(res);
e.parse();
printf("%s\n", loadresultstring(e.result).c_str());
LUAQueryMapper mapper(e.result);
std::string luamap = "return right.sphere";
printf("%s : %s\n", luamap.c_str(), mapper.map(luamap).c_str());
luamap = "return math.sin(right.cyl) * 2";
printf("%s : %s\n", luamap.c_str(), mapper.map(luamap).c_str());
return 0;
}
#endif/*TEST_LUAQUERYMAPPER*/
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