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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* luaformatmapper.cc
*
* Wed Oct 29 16:02:03 CET 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 "luaformatmapper.h"
#include <sstream>
#include "exception.h"
static std::string loadresultstring(Fields &fields)
{
std::string s;
Fields::iterator v = fields.begin();
while(v != fields.end()) {
s += (*v).first + " = \"" + (*v).second + "\"\n";
v++;
}
return s;
}
LUAFormatMapper::LUAFormatMapper(Fields &fields)
{
L = luaL_newstate();
if(L == NULL) {
error("Could not create LUA state.");
return;
}
luaL_openlibs(L);
std::string preload = loadresultstring(fields);
if(luaL_loadbuffer(L, preload.c_str(), preload.size(), "preload")) {
error(lua_tostring(L, lua_gettop(L)));
return;
}
// Run program (init)
if(lua_pcall(L, 0, LUA_MULTRET, 0)) {
error(lua_tostring(L, lua_gettop(L)));
return;
}
clean_top = lua_gettop(L);
}
LUAFormatMapper::~LUAFormatMapper()
{
lua_close(L);
}
std::string LUAFormatMapper::map(const std::string &mapper)
{
output = "";
if(L == NULL) {
error("LUA state not initialized!");
return output;
}
if(mapper == "") {
error("Empty LUA mapper detected in " + mapper);
return output;
}
// Load the mapper
if(luaL_loadbuffer(L, mapper.c_str(), mapper.size(), "mapper")) {
error(lua_tostring(L, lua_gettop(L)) + std::string(" in ") + mapper);
return output;
}
// Run the loaded code
if(lua_pcall(L, 0, LUA_MULTRET, 0)) {
error(lua_tostring(L, lua_gettop(L)) + std::string(" in ") + mapper);
return output;
}
// Check if app messed up the stack.
if(lua_gettop(L) != clean_top + 1) {
error("Wrong number of return values in " + mapper);
lua_pop(L, lua_gettop(L) - clean_top);
return output;
}
output = lua_tostring(L, lua_gettop(L));
lua_pop(L, 1);
return output;
}
void LUAFormatMapper::error(std::string message)
{
throw Exception("ERROR in LUAFormatMapper: " + message);
}
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