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lua.cpp
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lua.cpp
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#include "lua.h"
#define LUA_IMPL
#include <minilua/minilua.h>
void*getUserDataFromGlobalVar(lua_State *state, const char*name) {
lua_getglobal(state, name);
void *p=lua_touserdata(state, -1);
lua_pop(state, 1);
return p;
}
int getVar(lua_State *state) {
int argsCount = lua_gettop (state);
if(argsCount==0) {
qDebug()<<"lua \"var\" function expects string argument";
lua_pushstring(state, "");
return 1;
}
QString varName=QString(lua_tostring(state, 1));
WFExecutionContext*executionContext = (WFExecutionContext*)getUserDataFromGlobalVar(state, "executionContext");
QString input="";
if(executionContext->variables.contains(varName)) {
input=executionContext->variables[varName].toString();
}
QByteArray utf8 = input.toUtf8();
lua_pushstring(state, utf8.constData());
return 1;
}
int setVar(lua_State *state) {
int argsCount = lua_gettop (state);
if(argsCount!=2) {
qDebug()<<"lua \"setVar\" function expects following arguments (name, value)";
return 0;
}
WFExecutionContext*executionContext = (WFExecutionContext*)getUserDataFromGlobalVar(state, "executionContext");
QString varName=QString(lua_tostring(state, 1));
if(lua_isinteger(state, 2)){
int value=(int)lua_tointeger(state, 2);
QString varValue=QString::number(value);
executionContext->variables[varName]=varValue;
} else if(lua_isnumber(state, 2)){
double value=(double)lua_tonumber(state, 2);
QString varValue=QString::number(value, 'f', 7);
executionContext->variables[varName]=varValue;
} else if(lua_isstring(state, 2)) {
QString varValue=QString(lua_tostring(state, 2));
executionContext->variables[varName]=varValue;
} else if(lua_isnil(state, 2)) {
executionContext->variables[varName]="";
} else {
qDebug()<<"Cannot set ["<<varName<<"]. Only numbers and strings are supported";
}
return 0;
}
int output(lua_State *state) {
int argsCount = lua_gettop (state);
if(argsCount!=2) {
qDebug()<<"lua \"output\" function expects 2 arguments(port:int, data:string)";
return 0;
}
if(!lua_isinteger(state, 1)) {
qDebug()<<"lua \"output\" function expects first arguments port:int";
return 0;
}
QString data = lua_tostring(state,2);
int port = lua_tointegerx(state,1,NULL);
WFExecutionContext*executionContext = (WFExecutionContext*)getUserDataFromGlobalVar(state, "executionContext");
WFNodeHandler*nodeHandler = (WFNodeHandler*)getUserDataFromGlobalVar(state, "wfNodeHandler");
AppGlobals*appGlobals = (AppGlobals*)getUserDataFromGlobalVar(state, "appGlobal");
WorkflowPlugin*plugin=(WorkflowPlugin*)appGlobals->plugins[CONF_WORKFLOW];
executionContext->variables["input"]=data;
nodeHandler->sendToOutput(plugin, port, *executionContext);
return 0;
}
int print(lua_State *state){
int argsCount = lua_gettop (state);
QDebug debug = qDebug();
debug.noquote().nospace();
for(int i=1;i<=argsCount;i++){
if(lua_isstring(state, i)) {
QString value=QString(lua_tostring(state, i));
debug<<value;
} else if(lua_isnil(state, i)) {
debug<<"nil";
}
}
return 0;
}
int input(lua_State *state) {
WFExecutionContext*executionContext = (WFExecutionContext*)getUserDataFromGlobalVar(state, "executionContext");
QString input="";
if(executionContext->variables.contains("input")) {
input=executionContext->variables["input"].toString();
}
QByteArray utf8 = input.toUtf8();
lua_pushstring(state, utf8.constData());
return 1;
}
LuaExecutor::LuaExecutor(AppGlobals*appGlobals) {
this->appGlobals=appGlobals;
}
void LuaExecutor::execute(QString luaScript, WFExecutionContext*executionContext, WFNodeHandler*wfNodeHandler) {
lua_State *state = luaL_newstate();
luaL_openlibs(state);
luaState = state;
lua_pushlightuserdata(state,wfNodeHandler);
lua_setglobal(state, "wfNodeHandler");
lua_pushlightuserdata(state,appGlobals);
lua_setglobal(state, "appGlobal");
lua_register(state, "var", getVar);
lua_register(state, "setVar", setVar);
lua_register(state, "input", input);
lua_register(state, "output", output);
lua_register(state, "print", print);
lua_pushlightuserdata(state, executionContext);
lua_setglobal(state, "executionContext");
QByteArray utf8 = luaScript.toUtf8();
const char *data = utf8.constData();
int result=luaL_dostring(state, data);
if(result!=LUA_OK) {
const char*result=lua_tostring(state, 1);
QString errorMessage=QString(result);
qDebug()<<"Lua Script error: "<<errorMessage;
lua_pop(state, 1);
lua_close(state);
return;
}
lua_close(state);
}