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749 lines
19 KiB
749 lines
19 KiB
#include <global.h>
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#include <script/scriptcontext.h>
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#include <script/scriptfunctions.h>
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#include <core/resources.h>
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#include <lua.hpp>
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#include <boost/algorithm/string.hpp>
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ScriptContext g_lua;
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void ScriptContext::init()
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{
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L = luaL_newstate();
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if(!L)
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fatal("FATAL ERROR: could not create lua context");
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// load lua standard libraries
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luaL_openlibs(L);
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// setup custom package loader
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setupPackageLoader();
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registerScriptFunctions();
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}
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void ScriptContext::terminate()
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{
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collectGarbage();
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lua_close(L);
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L = NULL;
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}
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void ScriptContext::loadAllModules()
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{
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std::list<std::string> modules = g_resources.listDirectoryFiles("modules");
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foreach(const std::string& module, modules) {
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std::list<std::string> moduleFiles = g_resources.listDirectoryFiles("modules/" + module);
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foreach(const std::string& moduleFile, moduleFiles) {
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if(boost::ends_with(moduleFile, ".lua"))
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loadFile(std::string("modules/") + module + "/" + moduleFile);
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}
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}
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}
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bool ScriptContext::loadFile(const std::string& fileName)
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{
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std::stringstream fin;
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if(g_resources.loadFile(fileName, fin))
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return loadBuffer(fin.str(), fileName);
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else
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error("ERROR: script file '", fileName, "' doesn't exist");
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return false;
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}
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bool ScriptContext::loadBuffer(const std::string& text, const std::string& what)
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{
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if(loadBufferAsFunction(text, what) && callFunction())
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return true;
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return false;
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}
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bool ScriptContext::loadBufferAsFunction(const std::string& text, const std::string& what)
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{
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int ret = luaL_loadbuffer(L, text.c_str(), text.length(), ("@" + what).c_str());
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if(ret != 0){
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reportError(popString());
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return false;
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}
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if(!isFunction()) {
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pop();
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return false;
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}
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return true;
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}
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void ScriptContext::reportError(const std::string& errorDesc, const char *funcName)
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{
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std::stringstream ss;
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ss << "LUA Script ERROR: ";
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if(funcName)
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ss << " in " << funcName << "(): ";
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ss << errorDesc;
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error(ss.str());
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}
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void ScriptContext::reportErrorWithTraceback(const std::string& errorDesc, const char* funcName)
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{
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pushString(errorDesc);
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luaErrorHandler(L);
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reportError(popString(), funcName);
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}
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void ScriptContext::collectGarbage()
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{
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for(int i=0;i<2;i++)
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lua_gc(L, LUA_GCCOLLECT, 0);
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}
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int ScriptContext::getStackSize()
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{
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return lua_gettop(L);
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}
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void ScriptContext::insert(int index)
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{
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if(index != -1)
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lua_insert(L, index);
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}
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void ScriptContext::swap(int index)
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{
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insert(index);
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pushValue(index+1);
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remove(index);
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}
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void ScriptContext::remove(int index)
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{
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lua_remove(L, index);
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}
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bool ScriptContext::next(int index)
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{
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return lua_next(L, index);
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}
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void ScriptContext::releaseRef(int ref)
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{
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luaL_unref(L, LUA_REGISTRYINDEX, ref);
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}
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void ScriptContext::newTable()
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{
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lua_newtable(L);
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}
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void ScriptContext::setTable(int index)
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{
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lua_settable(L, index);
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}
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void *ScriptContext::newUserdata(int size)
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{
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return lua_newuserdata(L, size);
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}
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void ScriptContext::newMetatable(const std::string& name)
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{
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luaL_newmetatable(L, name.c_str());
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}
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void ScriptContext::setMetatable(const std::string& name, int index)
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{
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luaL_getmetatable(L, name.c_str());
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if(isNil())
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reportError(make_string("could not retrive metatable", name));
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else
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lua_setmetatable(L, index < 0 ? index-1 : index);
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}
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void ScriptContext::rawGet(const std::string& key)
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{
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pushString(key);
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lua_rawget(L, -2);
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}
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void ScriptContext::rawSet(const std::string& key)
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{
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pushString(key);
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insert(-2);
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lua_rawset(L, -3);
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}
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void ScriptContext::getField(const std::string& key)
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{
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lua_getfield(L, -1, key.c_str());
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}
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void ScriptContext::setField(const std::string& key)
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{
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lua_setfield(L, -2, key.c_str());
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}
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void ScriptContext::getScriptObjectField(const ScriptObjectPtr& scriptobject, const std::string& field)
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{
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if(scriptobject) {
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pushRef(scriptobject->getScriptTable());
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getField(field);
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remove(-2);
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} else
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pushNil();
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}
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void ScriptContext::setScriptObjectField(const ScriptObjectPtr& scriptobject, const std::string& field)
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{
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if(scriptobject) {
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pushRef(scriptobject->getScriptTable());
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insert(-2);
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setField(field);
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}
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pop();
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}
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void ScriptContext::rawGetGlobalTableField(const std::string& globalTable, const std::string& key)
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{
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getGlobal(globalTable);
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rawGet(key);
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remove(-2);
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}
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void ScriptContext::rawSetGlobalTableField(const std::string& globalTable, const std::string& key)
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{
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getGlobal(globalTable);
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insert(-2);
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rawSet(key);
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pop();
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}
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void ScriptContext::getGlobal(const std::string& key)
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{
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lua_getfield(L, LUA_GLOBALSINDEX, key.c_str());
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}
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void ScriptContext::setGlobal(const std::string& key)
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{
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lua_setfield(L, LUA_GLOBALSINDEX, key.c_str());
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}
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bool ScriptContext::isNil(int index)
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{
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return lua_isnil(L, index);
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}
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bool ScriptContext::isBoolean(int index)
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{
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return lua_isboolean(L, index);
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}
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bool ScriptContext::isNumber(int index)
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{
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return lua_isnumber(L, index);
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}
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bool ScriptContext::isString(int index)
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{
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return lua_isstring(L, index);
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}
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bool ScriptContext::isTable(int index)
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{
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return lua_istable(L, index);
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}
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bool ScriptContext::isUserdata(int index)
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{
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return lua_isuserdata(L, index);
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}
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bool ScriptContext::isFunction(int index)
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{
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return lua_isfunction(L, index);
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}
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bool ScriptContext::isCFunction(int index)
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{
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return lua_iscfunction(L, index);
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}
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bool ScriptContext::isLuaFunction(int index)
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{
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return isFunction(index) && !isCFunction(index);
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}
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void ScriptContext::pop(int n)
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{
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lua_pop(L, n);
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}
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bool ScriptContext::popBoolean()
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{
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bool b = (lua_toboolean(L, -1) != 0);
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pop();
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return b;
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}
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int ScriptContext::popInteger()
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{
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double d = lua_tonumber(L, -1);
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pop();
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return (int)d;
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}
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std::string ScriptContext::popString()
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{
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std::string str;
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if(lua_isstring(L, -1))
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str = lua_tostring(L, -1);
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pop();
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return str;
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}
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ScriptObjectPtr ScriptContext::popClassInstance()
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{
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ScriptObjectPtr object;
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if(isUserdata()) { // instances are store as userdata
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object = *((ScriptObjectPtr *)lua_touserdata(L, -1));
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if(!object)
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reportErrorWithTraceback("attempt to retrive class instance from a object that is already expired");
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} else if(!isNil()) // we accept nil values
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reportErrorWithTraceback("couldn't retrive class instance, the value is not a scriptobject type");
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pop();
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return object;
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}
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int ScriptContext::popRef()
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{
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return luaL_ref(L, LUA_REGISTRYINDEX);
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}
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void ScriptContext::pushNil()
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{
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lua_pushnil(L);
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}
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void ScriptContext::pushBoolean(bool b)
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{
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lua_pushboolean(L, b);
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}
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void ScriptContext::pushInteger(int32_t i)
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{
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lua_pushnumber(L, i);
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}
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void ScriptContext::pushString(const std::string& str)
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{
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lua_pushstring(L, str.c_str());
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}
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void ScriptContext::pushClassInstance(const ScriptObjectPtr& object)
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{
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if(object) {
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new(newUserdata(sizeof(ScriptObjectPtr))) ScriptObjectPtr(object);
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setMetatable(std::string(object->getScriptObjectType()) + "_mt");
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} else
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pushNil();
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}
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void ScriptContext::pushValue(int index)
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{
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lua_pushvalue(L, index);
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}
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void ScriptContext::pushRef(int ref)
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{
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lua_rawgeti(L, LUA_REGISTRYINDEX, ref);
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}
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std::string ScriptContext::getFunctionSourcePath(bool functionIsOnStack, int level)
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{
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std::string path;
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lua_Debug ar;
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memset(&ar, 0, sizeof(ar));
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if(functionIsOnStack)
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lua_getinfo(L, ">Sn", &ar);
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else {
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if(lua_getstack(L, level-1, &ar) == 1)
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lua_getinfo(L, "Sn", &ar);
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}
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// c function, we must get information of a level above
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if(strcmp("C", ar.what) == 0) {
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memset(&ar, 0, sizeof(ar));
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if(lua_getstack(L, level, &ar) == 1) {
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lua_getinfo(L, "f", &ar);
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return getFunctionSourcePath(true, level+1);
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}
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} else {
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if(ar.source) {
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std::string source = ar.source;
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std::size_t pos = source.find_last_of('/');
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if(source[0] == '@' && pos != std::string::npos)
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path = source.substr(1, pos - 1);
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} else {
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error("no source");
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}
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}
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return path;
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}
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bool ScriptContext::callFunction(int numArgs, int numRets)
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{
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pushValue(-numArgs - 1);
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g_resources.pushCurrentPath(getFunctionSourcePath(true));
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int size = getStackSize();
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int errorIndex = -numArgs - 2;
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lua_pushcfunction(L, &ScriptContext::luaErrorHandler);
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insert(errorIndex);
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int ret = lua_pcall(L, numArgs, numRets, errorIndex);
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if(ret != 0) {
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reportError(popString());
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pop(); // pop error func
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return false;
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}
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remove(-numRets - 1); // pop error func
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if(getStackSize() != size - numArgs - 1 + numRets) {
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reportError("stack size changed!");
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return false;
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}
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g_resources.popCurrentPath();
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return true;
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}
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void ScriptContext::callModuleField(const std::string& module, const std::string& field)
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{
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g_lua.rawGetGlobalTableField(module, field);
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g_lua.callFunction();
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}
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void ScriptContext::setupPackageLoader()
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{
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lua_getfield(L, LUA_GLOBALSINDEX, "package"); // package
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lua_getfield(L, -1, "loaders"); // package.loaders, package
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lua_remove(L, -2); // package.loaders
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lua_pushnil(L); // nil, package.loaders
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int numLoaders = 0;
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while(lua_next(L, -2) != 0) {
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// value, key, package.loaders
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lua_pop(L, 1); // key, package.loaders
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numLoaders++;
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}
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lua_pushinteger(L, numLoaders + 1); // at, package.loaders
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lua_pushcfunction(L, &ScriptContext::luaPackageLoader); // luaPackageLoader, at, package.loaders
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lua_rawset(L, -3); // package.loaders
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lua_pop(L, 1); // (empty)
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}
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void ScriptContext::registerClass(const std::string& klass, const std::string& baseClass)
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{
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// mt = {}
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lua_newtable(L);
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lua_pushvalue(L, -1);
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lua_setfield(L, LUA_REGISTRYINDEX, (klass + "_mt").c_str());
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// set __index metamethod
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lua_pushcfunction(L, &ScriptContext::luaIndexMetaMethod);
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lua_setfield(L, -2, "__index");
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// set __newindex metamethod
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lua_pushcfunction(L, &ScriptContext::luaNewIndexMetaMethod);
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lua_setfield(L, -2, "__newindex");
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// set __eq metamethod
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lua_pushcfunction(L, &ScriptContext::luaEqualMetaMethod);
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lua_setfield(L, -2, "__eq");
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// set __gc metamethod, which collects userdata
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lua_pushcfunction(L, &ScriptContext::luaGarbageCollectMetaMethod);
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lua_setfield(L, -2, "__gc");
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// klass = { }
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lua_newtable(L);
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lua_pushvalue(L, -1);
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lua_setfield(L, LUA_GLOBALSINDEX, klass.c_str());
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// mt.methods = klass
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lua_setfield(L, -2, "methods");
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// klass_fieldmethods = { }
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lua_newtable(L);
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lua_pushvalue(L, -1);
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lua_setfield(L, LUA_GLOBALSINDEX, (klass + "_fieldmethods").c_str());
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// mt.fieldmethods = klass_fieldmethods
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lua_setfield(L, -2, "fieldmethods");
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if(baseClass.length()) {
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// get klass
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lua_getfield(L, LUA_GLOBALSINDEX, klass.c_str());
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// redirect = { __index = baseClass }
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lua_newtable(L);
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lua_getfield(L, LUA_GLOBALSINDEX, baseClass.c_str());
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lua_setfield(L, -2, "__index");
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// setmetatable(klass, redirect)
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lua_setmetatable(L, -2);
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lua_pop(L, 1);
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// get klass_fieldmethods
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lua_getfield(L, LUA_GLOBALSINDEX, (klass + "_fieldmethods").c_str());
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// redirect = { __index = baseClass_fieldmethods }
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lua_newtable(L);
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lua_getfield(L, LUA_GLOBALSINDEX, (baseClass + "_fieldmethods").c_str());
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lua_setfield(L, -2, "__index");
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// setmetatable(klass_fieldmethods, redirect)
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lua_setmetatable(L, -2);
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}
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lua_pop(L, 1);
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m_currentClass = klass;
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}
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void ScriptContext::registerMemberField(const std::string& field, ScriptContext::LuaCFunction getFunction, ScriptContext::LuaCFunction setFunction)
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{
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if(getFunction) {
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int functionId = m_functions.size();
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m_functions.push_back(getFunction);
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// push the class table
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lua_getfield(L, LUA_GLOBALSINDEX, (m_currentClass + "_fieldmethods").c_str());
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// push the function id
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lua_pushnumber(L, functionId);
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// store id in the closure
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lua_pushcclosure(L, &ScriptContext::luaFunctionCallback, 1);
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// store the function at the class field functionName
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lua_setfield(L, -2, ("get_" + field).c_str());
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// pop the table
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lua_pop(L, 1);
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}
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if(setFunction) {
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int functionId = m_functions.size();
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m_functions.push_back(setFunction);
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// push the class table
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lua_getfield(L, LUA_GLOBALSINDEX, (m_currentClass + "_fieldmethods").c_str());
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// push the function id
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lua_pushnumber(L, functionId);
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// store id in the closure
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lua_pushcclosure(L, &ScriptContext::luaFunctionCallback, 1);
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// store the function at the class field functionName
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lua_setfield(L, -2, ("set_" + field).c_str());
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// pop the table
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lua_pop(L, 1);
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}
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}
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void ScriptContext::registerMemberFunction(const std::string& functionName, LuaCFunction function)
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{
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int functionId = m_functions.size();
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m_functions.push_back(function);
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// push the class table
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lua_getfield(L, LUA_GLOBALSINDEX, m_currentClass.c_str());
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// push the function id
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lua_pushnumber(L, functionId);
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// store id in the closure
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lua_pushcclosure(L, &ScriptContext::luaFunctionCallback, 1);
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// store the function at the class field functionName
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lua_setfield(L, -2, functionName.c_str());
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// pop the table
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lua_pop(L, 1);
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}
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void ScriptContext::registerGlobalFunction(const std::string& functionName, LuaCFunction function)
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{
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int functionId = m_functions.size();
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m_functions.push_back(function);
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// push the function id
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lua_pushnumber(L, functionId);
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// store id in the closure
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lua_pushcclosure(L, &ScriptContext::luaFunctionCallback, 1);
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// store the function in the global lua table
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lua_setfield(L, LUA_GLOBALSINDEX, functionName.c_str());
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}
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void ScriptContext::registerModule(const std::string& module)
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{
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registerClass(module);
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lua_getfield(L, LUA_GLOBALSINDEX, module.c_str());
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lua_getfield(L, LUA_REGISTRYINDEX, (module + "_mt").c_str());
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lua_setmetatable(L, -2);
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lua_pop(L, -1);
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}
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int ScriptContext::luaPackageLoader(lua_State* L)
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{
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std::string fileName = lua_tostring(L, -1);
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fileName += ".lua";
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if(g_resources.fileExists(fileName)) {
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std::stringstream fin;
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if(g_resources.loadFile(fileName, fin))
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luaL_loadbuffer(L, fin.str().c_str(), fin.str().length(), fileName.c_str());
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} else {
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lua_pushfstring(L, "\n\tcould not load lua script " LUA_QS, fileName.c_str());
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}
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return 1;
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}
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int ScriptContext::luaIndexMetaMethod(lua_State* L)
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{
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// stack: key, obj
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std::string key = lua_tostring(L, -1); // key, obj
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lua_pop(L, 1); // obj
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lua_getmetatable(L, -1); // mt, obj
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lua_getfield(L, -1, "fieldmethods"); // fieldmethods, mt, obj
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lua_getfield(L, -1, ("get_" + key).c_str()); // get_method, fieldmethods, mt, obj
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lua_remove(L, -2); // get_method, mt, obj
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if(!lua_isnil(L, -1)) {
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lua_remove(L, -2); // get_method, obj
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lua_insert(L, -2); // obj, get_method
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if(!g_lua.callFunction(1, 1))
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lua_pushnil(L);
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return 1;
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} else {
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lua_pop(L, 1); // mt, obj
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lua_getfield(L, -1, "methods"); // methods, mt, obj
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lua_getfield(L, -1, key.c_str()); // method, methods, mt, obj
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lua_remove(L, -2); // method, mt, obj
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if(!lua_isnil(L, -1)) {
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lua_insert(L, -3); // mt, obj, method
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lua_pop(L, 2); // method
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return 1;
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}
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lua_pop(L, 1); // mt, obj
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}
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lua_pop(L, 1); // obj
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// stack: obj
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if(g_lua.isTable()) {
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g_lua.rawGet(key);
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g_lua.remove(-2);
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} else if(g_lua.isUserdata()) {
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g_lua.getScriptObjectField(g_lua.popClassInstance(), key);
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} else {
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g_lua.pop();
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g_lua.pushNil();
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g_lua.reportErrorWithTraceback("unknown type in newindex metamethod");
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}
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return 1;
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}
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int ScriptContext::luaNewIndexMetaMethod(lua_State* L)
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{
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// stack: value, key, obj
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lua_insert(L, -2); // key, value, obj
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std::string key = lua_tostring(L, -1);
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lua_pop(L, 1); // value, obj
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lua_getmetatable(L, -2); // mt, value, obj
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lua_getfield(L, -1, "fieldmethods"); // fieldmethods, mt, value, obj
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lua_getfield(L, -1, ("set_" + key).c_str()); // set_method, fieldmethods, mt, value, obj
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lua_remove(L, -2); // set_method, mt, value, obj
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if(!lua_isnil(L, -1)) {
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lua_remove(L, -2); // set_method, value, obj
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lua_insert(L, -3); // value, obj, set_method
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g_lua.callFunction(2);
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return 1;
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}
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lua_pop(L, 2); // mt, value, obj
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// stack: value, obj
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g_lua.insert(-2);
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if(g_lua.isTable()) {
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g_lua.insert(-2);
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g_lua.rawSet(key);
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g_lua.pop();
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} else if(g_lua.isUserdata()) {
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g_lua.setScriptObjectField(g_lua.popClassInstance(), key);
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} else {
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g_lua.pop(2);
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g_lua.reportErrorWithTraceback("unknown type in index metamethod");
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}
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return 1;
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}
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int ScriptContext::luaEqualMetaMethod(lua_State* L)
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{
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if(!lua_isuserdata(L, -1) || !lua_isuserdata(L, -2)) {
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lua_pop(L, 2);
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lua_pushboolean(L, 0);
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} else {
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ScriptObjectPtr *objectRef1 = (ScriptObjectPtr *)lua_touserdata(L, -1);
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ScriptObjectPtr *objectRef2 = (ScriptObjectPtr *)lua_touserdata(L, -2);
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lua_pop(L, 2);
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if(objectRef1 == objectRef2)
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lua_pushboolean(L, 1);
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else
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lua_pushboolean(L, 0);
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}
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return 1;
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}
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int ScriptContext::luaGarbageCollectMetaMethod(lua_State* L)
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{
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if(lua_isuserdata(L, -1)) {
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ScriptObjectPtr *objectRef = (ScriptObjectPtr *)lua_touserdata(L, -1);
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objectRef->reset();
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}
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lua_pop(L, 1);
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return 1;
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}
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int ScriptContext::luaFunctionCallback(lua_State* L)
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{
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// look for function id
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int id = lua_tonumber(L, lua_upvalueindex(1));
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g_resources.pushCurrentPath(g_lua.getFunctionSourcePath(false));
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// call the function
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int ret = (*(g_lua.m_functions[id]))();
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g_resources.popCurrentPath();
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return ret;
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}
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int ScriptContext::luaErrorHandler(lua_State *L)
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{
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// push debug
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lua_getfield(L, LUA_GLOBALSINDEX, "debug");
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if(!lua_istable(L, -1)) {
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lua_pop(L, 1);
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return 1;
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}
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// push debug.traceback
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lua_getfield(L, -1, "traceback");
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if(!lua_isfunction(L, -1)) {
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lua_pop(L, 2);
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return 1;
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}
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// remove debug
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lua_remove(L, -2);
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// push additional error message
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lua_pushvalue(L, -2);
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// push level
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lua_pushinteger(L, 2);
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// call debug.traceback
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lua_call(L, 2, 1);
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// remove additional error message
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lua_remove(L, -2);
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// return, the complete error message is on the stack
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return 1;
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}
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