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/**
* @file
* @author 2012-2014 Stefan Radomski (stefan.radomski@cs.tu-darmstadt.de)
* @copyright Simplified BSD
*
* @cond
* This program is free software: you can redistribute it and/or modify
* it under the terms of the FreeBSD license as published by the FreeBSD
* project.
*
* This program 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.
*
* You should have received a copy of the FreeBSD license along with this
* program. If not, see <http://www.opensource.org/licenses/bsd-license>.
* @endcond
*/
#include "uscxml/Common.h"
#include "uscxml/util/URL.h"
#include "uscxml/util/String.h"
#include "LuaDataModel.h"
// disable forcing to bool performance warning
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable : 4800)
#endif
#include "LuaBridge.h"
#ifdef _MSC_VER
#pragma warning(pop)
#endif
#include "uscxml/messages/Event.h"
#ifndef NO_XERCESC
#include "uscxml/util/DOM.h"
#endif
#include "uscxml/interpreter/Logging.h"
#include <boost/algorithm/string.hpp>
//#include "LuaDOM.cpp.inc"
#ifdef BUILD_AS_PLUGINS
#include <Pluma/Connector.hpp>
#endif
namespace uscxml {
#ifdef BUILD_AS_PLUGINS
PLUMA_CONNECTOR
bool pluginConnect(pluma::Host& host) {
host.add( new LuaDataModelProvider() );
return true;
}
#endif
//static int luaInspect(lua_State * l) {
// return 0;
//}
bool _luaHasXMLParser = false;
static int luaEval(lua_State* luaState, const std::string& expr) {
int preStack = lua_gettop(luaState);
int error = luaL_loadstring(luaState, expr.c_str()) || lua_pcall(luaState, 0, LUA_MULTRET, 0);
if (error) {
std::string errMsg = lua_tostring(luaState, -1);
lua_pop(luaState, 1); /* pop error message from the stack */
ERROR_EXECUTION_THROW(errMsg);
}
int postStack = lua_gettop(luaState);
return postStack - preStack;
}
static Data getLuaAsData(lua_State* _luaState, const luabridge::LuaRef& lua) {
Data data;
if (lua.isFunction()) {
// TODO: this might lead to a stack-overflow
luabridge::LuaRef luaEvald = lua();
return getLuaAsData(_luaState, luaEvald);
} else if(lua.isLightUserdata() || lua.isUserdata()) {
// not sure what to do
} else if(lua.isThread()) {
// not sure what to do
} else if(lua.isNil()) {
data.atom = "nil";
data.type = Data::INTERPRETED;
} else if(lua.isNumber()) {
data.atom = toStr(lua.cast<double>());
data.type = Data::INTERPRETED;
} else if(lua.isString()) {
data.atom = lua.cast<std::string>();
data.type = Data::VERBATIM;
} else if(lua.isTable()) {
// bool isArray = false;
// bool isMap = false;
for (luabridge::Iterator iter (lua); !iter.isNil(); ++iter) {
luabridge::LuaRef luaKey = iter.key();
luabridge::LuaRef luaVal = *iter;
if (luaKey.isString()) {
// assert(!isArray);
// isMap = true;
// luaKey.tostring() is not working?! see issue84
data.compound[luaKey.cast<std::string>()] = getLuaAsData(_luaState, luaVal);
} else {
// assert(!isMap);
// isArray = true;
data.array.push_back(getLuaAsData(_luaState, luaVal));
}
}
}
return data;
}
static luabridge::LuaRef getDataAsLua(lua_State* _luaState, const Data& data) {
luabridge::LuaRef luaData (_luaState);
if (data.node) {
if (_luaHasXMLParser) {
const luabridge::LuaRef& luaLom = luabridge::getGlobal(_luaState, "lxp.lom");
const luabridge::LuaRef& luaLomParse = luaLom["parse"];
assert(luaLomParse.isFunction());
std::stringstream luaXMLSS;
luaXMLSS << data.node;
try {
luaData = luaLomParse(luaXMLSS.str());
} catch (luabridge::LuaException e) {
ERROR_EXECUTION_THROW(e.what());
}
return luaData;
}
}
if (data.compound.size() > 0) {
luaData = luabridge::newTable(_luaState);
std::map<std::string, Data>::const_iterator compoundIter = data.compound.begin();
while(compoundIter != data.compound.end()) {
luaData[compoundIter->first] = getDataAsLua(_luaState, compoundIter->second);
compoundIter++;
}
// luaData["inspect"] = luaInspect;
return luaData;
}
if (data.array.size() > 0) {
luaData = luabridge::newTable(_luaState);
std::list<Data>::const_iterator arrayIter = data.array.begin();
// uint32_t index = 0;
while(arrayIter != data.array.end()) {
// luaData[index++] = getDataAsLua(_luaState, *arrayIter);
luaData.append(getDataAsLua(_luaState, *arrayIter));
arrayIter++;
}
// luaData["inspect"] = luaInspect;
return luaData;
}
if (data.atom.size() > 0) {
switch (data.type) {
case Data::VERBATIM: {
luaData = data.atom;
break;
}
case Data::INTERPRETED: {
if (isNumeric(data.atom.c_str(), 10)) {
if (data.atom.find(".") != std::string::npos) {
luaData = strTo<double>(data.atom);
} else {
luaData = strTo<long>(data.atom);
}
} else {
int retVals = luaEval(_luaState, "return(" + data.atom + ");");
if (retVals == 1) {
luaData = luabridge::LuaRef::fromStack(_luaState, -1);
}
lua_pop(_luaState, retVals);
}
}
}
return luaData;
}
// hopefully this is nil
return luabridge::LuaRef(_luaState);
}
LuaDataModel::LuaDataModel() {
_luaState = NULL;
}
int LuaDataModel::luaInFunction(lua_State * l) {
luabridge::LuaRef ref = luabridge::getGlobal(l, "__datamodel");
LuaDataModel* dm = ref.cast<LuaDataModel*>();
int stackSize = lua_gettop(l);
for (int i = 0; i < stackSize; i++) {
if (!lua_isstring(l, -1 - i))
continue;
std::string stateName = lua_tostring(l, -1 - i);
if (dm->_callbacks->isInState(stateName))
continue;
lua_pushboolean(l, 0);
return 1;
}
lua_pushboolean(l, 1);
return 1;
}
std::shared_ptr<DataModelImpl> LuaDataModel::create(DataModelCallbacks* callbacks) {
std::shared_ptr<LuaDataModel> dm(new LuaDataModel());
dm->_callbacks = callbacks;
dm->_luaState = luaL_newstate();
luaL_openlibs(dm->_luaState);
try {
const luabridge::LuaRef& requireFunc = luabridge::getGlobal(dm->_luaState, "require");
if (requireFunc.isFunction()) {
const luabridge::LuaRef& resultLxp = requireFunc("lxp");
const luabridge::LuaRef& resultLxpLOM = requireFunc("lxp.lom");
// MSVC compiler bug with implicit cast operators, see comments in LuaRef class
if ((bool)resultLxp && (bool)resultLxpLOM) {
_luaHasXMLParser = true;
luabridge::setGlobal(dm->_luaState, resultLxp, "lxp");
luabridge::setGlobal(dm->_luaState, resultLxpLOM, "lxp.lom");
}
}
} catch (luabridge::LuaException e) {
LOG(_callbacks->getLogger(), USCXML_INFO) << e.what();
}
luabridge::getGlobalNamespace(dm->_luaState).beginClass<LuaDataModel>("DataModel").endClass();
luabridge::setGlobal(dm->_luaState, dm.get(), "__datamodel");
luabridge::getGlobalNamespace(dm->_luaState).addCFunction("In", luaInFunction);
luabridge::LuaRef ioProcTable = luabridge::newTable(dm->_luaState);
std::map<std::string, IOProcessor> ioProcs = dm->_callbacks->getIOProcessors();
std::map<std::string, IOProcessor>::const_iterator ioProcIter = ioProcs.begin();
while(ioProcIter != ioProcs.end()) {
Data ioProcData = ioProcIter->second.getDataModelVariables();
ioProcTable[ioProcIter->first] = getDataAsLua(dm->_luaState, ioProcData);
ioProcIter++;
}
luabridge::setGlobal(dm->_luaState, ioProcTable, "_ioprocessors");
luabridge::LuaRef invTable = luabridge::newTable(dm->_luaState);
std::map<std::string, Invoker> invokers = dm->_callbacks->getInvokers();
std::map<std::string, Invoker>::const_iterator invIter = invokers.begin();
while(invIter != invokers.end()) {
Data invData = invIter->second.getDataModelVariables();
invTable[invIter->first] = getDataAsLua(dm->_luaState, invData);
invIter++;
}
luabridge::setGlobal(dm->_luaState, invTable, "_invokers");
luabridge::setGlobal(dm->_luaState, dm->_callbacks->getName(), "_name");
luabridge::setGlobal(dm->_luaState, dm->_callbacks->getSessionId(), "_sessionid");
return dm;
}
LuaDataModel::~LuaDataModel() {
if (_luaState != NULL)
lua_close(_luaState);
}
void LuaDataModel::addExtension(DataModelExtension* ext) {
ERROR_EXECUTION_THROW("Extensions unimplemented in lua datamodel");
}
void LuaDataModel::setEvent(const Event& event) {
luabridge::LuaRef luaEvent(_luaState);
luaEvent = luabridge::newTable(_luaState);
luaEvent["name"] = event.name;
if (event.raw.size() > 0)
luaEvent["raw"] = event.raw;
if (event.origin.size() > 0)
luaEvent["origin"] = event.origin;
if (event.origintype.size() > 0)
luaEvent["origintype"] = event.origintype;
if (event.invokeid.size() > 0)
luaEvent["invokeid"] = event.invokeid;
if (!event.hideSendId)
luaEvent["sendid"] = event.sendid;
// luaEvent["inspect"] = luaInspect;
switch (event.eventType) {
case Event::INTERNAL:
luaEvent["type"] = "internal";
break;
case Event::EXTERNAL:
luaEvent["type"] = "external";
break;
case Event::PLATFORM:
luaEvent["type"] = "platform";
break;
default:
break;
}
if (event.data.node) {
if (_luaHasXMLParser) {
const luabridge::LuaRef& luaLom = luabridge::getGlobal(_luaState, "lxp.lom");
const luabridge::LuaRef& luaLomParse = luaLom["parse"];
assert(luaLomParse.isFunction());
std::stringstream luaXMLSS;
luaXMLSS << event.data.node;
try {
luaEvent["data"] = luaLomParse(luaXMLSS.str());
} catch (luabridge::LuaException e) {
ERROR_EXECUTION_THROW(e.what());
}
} else {
ERROR_EXECUTION_THROW("No DOM support in Lua datamodel");
}
} else {
// _event.data is KVP
Data d = event.data;
if (!event.params.empty()) {
Event::params_t::const_iterator paramIter = event.params.begin();
while(paramIter != event.params.end()) {
d.compound[paramIter->first] = paramIter->second;
paramIter++;
}
}
if (!event.namelist.empty()) {
Event::namelist_t::const_iterator nameListIter = event.namelist.begin();
while(nameListIter != event.namelist.end()) {
d.compound[nameListIter->first] = nameListIter->second;
nameListIter++;
}
}
if (!d.empty()) {
luabridge::LuaRef luaData = getDataAsLua(_luaState, d);
assert(luaEvent.isTable());
// assert(luaData.isTable()); // not necessarily test179
luaEvent["data"] = luaData;
}
}
luabridge::setGlobal(_luaState, luaEvent, "_event");
}
Data LuaDataModel::evalAsData(const std::string& content) {
Data data;
ErrorEvent originalError;
std::string trimmedExpr = boost::trim_copy(content);
try {
int retVals = luaEval(_luaState, "return(" + trimmedExpr + ")");
if (retVals == 1) {
data = getLuaAsData(_luaState, luabridge::LuaRef::fromStack(_luaState, -1));
}
lua_pop(_luaState, retVals);
return data;
} catch (ErrorEvent e) {
originalError = e;
}
int retVals = 0;
try {
// evaluate again without the return()
retVals = luaEval(_luaState, trimmedExpr);
} catch (ErrorEvent e) {
throw originalError; // we will assume syntax error and throw
}
#if 1
// Note: Empty result is not an error test302, but how to do test488?
if (retVals == 0 && !isValidSyntax(trimmedExpr)) {
throw originalError; // we will assume syntax error and throw
}
#endif
try {
if (retVals == 1) {
data = getLuaAsData(_luaState, luabridge::LuaRef::fromStack(_luaState, -1));
}
lua_pop(_luaState, retVals);
return data;
} catch (ErrorEvent e) {
throw e; // we will assume syntax error and throw
}
return data;
}
bool LuaDataModel::isValidSyntax(const std::string& expr) {
int preStack = lua_gettop(_luaState);
int err = luaL_loadstring (_luaState, expr.c_str());
// clean stack again
lua_pop(_luaState, lua_gettop(_luaState) - preStack);
if (err == LUA_ERRSYNTAX)
return false;
return true;
}
uint32_t LuaDataModel::getLength(const std::string& expr) {
// we need the result of the expression on the lua stack -> has to "return"!
std::string trimmedExpr = boost::trim_copy(expr);
if (!boost::starts_with(trimmedExpr, "return")) {
trimmedExpr = "return(#" + trimmedExpr + ")";
}
int retVals = luaEval(_luaState, trimmedExpr);
#if 1
if (retVals == 1 && lua_isnumber(_luaState, -1)) {
int result = lua_tointeger(_luaState, -1);
lua_pop(_luaState, 1);
return result;
}
lua_pop(_luaState, retVals);
ERROR_EXECUTION_THROW("'" + expr + "' does not evaluate to an array.");
return 0;
#else
if (retVals == 1) {
luabridge::LuaRef luaData = luabridge::LuaRef::fromStack(_luaState, -1);
if (luaData.isNumber()) {
lua_pop(_luaState, retVals);
return luaData.cast<int>();
}
}
lua_pop(_luaState, retVals);
ERROR_EXECUTION_THROW("'" + expr + "' does not evaluate to an array.");
return 0;
#endif
}
void LuaDataModel::setForeach(const std::string& item,
const std::string& array,
const std::string& index,
uint32_t iteration) {
iteration++; // test153: arrays start at 1
const luabridge::LuaRef& arrRef = luabridge::getGlobal(_luaState, array.c_str());
if (arrRef.isTable()) {
// triggers syntax error for invalid items, test 152
int retVals = luaEval(_luaState, item + " = " + array + "[" + toStr(iteration) + "]");
lua_pop(_luaState, retVals);
if (index.length() > 0) {
int retVals = luaEval(_luaState, index + " = " + toStr(iteration));
lua_pop(_luaState, retVals);
}
}
}
bool LuaDataModel::isDeclared(const std::string& expr) {
// see: http://lua-users.org/wiki/DetectingUndefinedVariables
return true;
}
void LuaDataModel::assign(const std::string& location, const Data& data, const std::map<std::string, std::string>& attr) {
if (location.length() == 0) {
ERROR_EXECUTION_THROW("Assign element has neither id nor location");
}
// flags on attribute are ignored?
if (location.compare("_sessionid") == 0) // test 322
ERROR_EXECUTION_THROW("Cannot assign to _sessionId");
if (location.compare("_name") == 0)
ERROR_EXECUTION_THROW("Cannot assign to _name");
if (location.compare("_ioprocessors") == 0) // test 326
ERROR_EXECUTION_THROW("Cannot assign to _ioprocessors");
if (location.compare("_invokers") == 0)
ERROR_EXECUTION_THROW("Cannot assign to _invokers");
if (location.compare("_event") == 0)
ERROR_EXECUTION_THROW("Cannot assign to _event");
if (data.node) {
ERROR_EXECUTION_THROW("Cannot assign xml nodes in lua datamodel");
// TODO: DOM is prepared by swig
// return SWIG_JSC_NewPointerObj(_ctx,
// (void*)node,
// SWIG_TypeDynamicCast(SWIGTYPE_p_XERCES_CPP_NAMESPACE__DOMNode,
// SWIG_as_voidptrptr(&node)),
// 0);
// JSObjectSetProperty(_ctx, JSContextGetGlobalObject(_ctx), JSStringCreateWithUTF8CString(location.c_str()), getNodeAsValue(data.node), 0, &exception);
} else {
// trigger error.execution for undefined locations, test286 test311
int retVals = luaEval(_luaState, location + " = " + location);
lua_pop(_luaState, retVals);
std::list<std::pair<std::string, bool> > idPath;
size_t start = 0;
for (size_t i = 0; i < location.size(); i++) {
if (location[i] == '.' || location[i] == '[') {
idPath.push_back(std::make_pair(location.substr(start, i - start), false));
start = i + 1;
} else if (location[i] == ']') {
idPath.push_back(std::make_pair(location.substr(start, i - start), true));
start = i + 1;
}
}
if (start < location.size())
idPath.push_back(std::make_pair(location.substr(start, location.size() - start), false));
if (idPath.size() == 0)
return;
luabridge::LuaRef lua = getDataAsLua(_luaState, data);
if (idPath.size() == 1) {
// trivial case where we reference a simple toplevel identifier
luabridge::setGlobal(_luaState, lua, location.c_str());
} else {
auto globalId = idPath.front();
idPath.pop_front();
auto field = idPath.back();
idPath.pop_back();
luabridge::LuaRef topValue = luabridge::getGlobal(_luaState, globalId.first.c_str());
luabridge::LuaRef value = topValue;
for (auto ident : idPath) {
if (!value.isTable())
value = luabridge::newTable(_luaState);
if (ident.second) {
luabridge::LuaRef tmp = value[strTo<long>(ident.first)];
} else {
luabridge::LuaRef tmp = value[ident];
value = tmp;
}
}
if (field.second) {
value[strTo<long>(field.first)] = lua;
} else {
value[field.first] = lua;
}
}
// std::cout << Data::toJSON(evalAsData(location)) << std::endl;
}
}
void LuaDataModel::init(const std::string& location, const Data& data, const std::map<std::string, std::string>& attr) {
luabridge::setGlobal(_luaState, luabridge::Nil(), location.c_str());
assign(location, data);
}
bool LuaDataModel::evalAsBool(const std::string& expr) {
// we need the result of the expression on the lua stack -> has to "return"!
std::string trimmedExpr = boost::trim_copy(expr);
int retVals = luaEval(_luaState, "return(" + trimmedExpr + ")");
if (retVals == 1) {
bool result = lua_toboolean(_luaState, -1);
lua_pop(_luaState, 1);
return result;
}
lua_pop(_luaState, retVals);
return false;
}
Data LuaDataModel::getAsData(const std::string& content) {
Data data;
std::string trimmedExpr = boost::trim_copy(content);
int retVals = luaEval(_luaState, "__tmp = " + content + "; return __tmp");
if (retVals == 1) {
data = getLuaAsData(_luaState, luabridge::LuaRef::fromStack(_luaState, -1));
}
lua_pop(_luaState, retVals);
// escape as a string, this is sometimes the case with <content>
if (data.atom == "nil" && data.type == Data::INTERPRETED) {
int retVals = luaEval(_luaState, "__tmp = '" + content + "'; return __tmp");
if (retVals == 1) {
data = getLuaAsData(_luaState, luabridge::LuaRef::fromStack(_luaState, -1));
}
lua_pop(_luaState, retVals);
}
return data;
}
}
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