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LuaParser.cpp
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LuaParser.cpp
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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "LuaParser.h"
#include <algorithm>
#include <limits.h>
#include "lib/streflop/streflop_cond.h"
#include "System/float3.h"
#include "System/float4.h"
#include "LuaInclude.h"
#include "LuaConstEngine.h"
#include "LuaIO.h"
#include "LuaUtils.h"
#include "Game/GameVersion.h"
#include "Sim/Misc/GlobalSynced.h" // gsRNG
#include "System/Log/ILog.h"
#include "System/FileSystem/FileHandler.h"
#include "System/Misc/SpringTime.h"
#include "System/ContainerUtil.h"
#include "System/ScopedFPUSettings.h"
#include "System/StringUtil.h"
LuaParser* GetLuaParser(lua_State* L) {
assert(GetLuaContextData(L)->parser != nullptr);
return GetLuaContextData(L)->parser;
}
/******************************************************************************/
/******************************************************************************/
//
// LuaParser
//
LuaParser::LuaParser(const string& _fileName, const string& _fileModes, const string& _accessModes, const boolean& synced)
: fileName(_fileName)
, fileModes(_fileModes)
, accessModes(_accessModes)
, D(false, false)
, initDepth(0)
, rootRef(LUA_NOREF)
, currentRef(LUA_NOREF)
, valid(false)
, lowerKeys(true)
, lowerCppKeys(true)
{
// be on the safe side
D.synced = true;
D.parser = this;
if ((L = LUA_OPEN(&D)) != nullptr) {
SetupEnv(synced.b);
}
}
LuaParser::LuaParser(const string& _textChunk, const string& _accessModes, const boolean& synced)
: fileName("")
, fileModes("")
, textChunk(_textChunk)
, accessModes(_accessModes)
, D(false, false)
, initDepth(0)
, rootRef(LUA_NOREF)
, currentRef(LUA_NOREF)
, valid(false)
, lowerKeys(true)
, lowerCppKeys(true)
{
// be on the safe side
D.synced = true;
D.parser = this;
if ((L = LUA_OPEN(&D)) != nullptr) {
SetupEnv(synced.b);
}
}
LuaParser::~LuaParser()
{
// prevent crashes in glDelete* calls since LuaParser
// might be constructed by multiple different threads
D.Clear();
if (L != nullptr)
LUA_CLOSE(&L);
// invalidate leftover tables if parser is destroyed first
for (LuaTable* table: tables) {
table->parser = nullptr;
table->L = nullptr;
table->isValid = false;
table->refnum = LUA_NOREF;
}
}
void LuaParser::SetupEnv(bool synced)
{
LUA_OPEN_LIB(L, luaopen_base);
LUA_OPEN_LIB(L, luaopen_math);
LUA_OPEN_LIB(L, luaopen_table);
LUA_OPEN_LIB(L, luaopen_string);
//LUA_OPEN_LIB(L, luaopen_io);
//LUA_OPEN_LIB(L, luaopen_os);
//LUA_OPEN_LIB(L, luaopen_package);
//LUA_OPEN_LIB(L, luaopen_debug);
// delete some dangerous/unsynced functions
lua_pushnil(L); lua_setglobal(L, "dofile");
lua_pushnil(L); lua_setglobal(L, "loadfile");
lua_pushnil(L); lua_setglobal(L, "loadlib");
lua_pushnil(L); lua_setglobal(L, "require");
lua_pushnil(L); lua_setglobal(L, "gcinfo");
lua_pushnil(L); lua_setglobal(L, "collectgarbage");
lua_pushnil(L); lua_setglobal(L, "newproxy"); // not sync-safe cause of __gc
{
lua_getglobal(L, "math");
if (synced) {
LuaPushNamedCFunc(L, "random", Random);
LuaPushNamedCFunc(L, "randomseed", RandomSeed);
} else {
LuaPushNamedCFunc(L, "random", DummyRandom);
LuaPushNamedCFunc(L, "randomseed", DummyRandomSeed);
}
lua_pop(L, 1); // pop "math"
}
AddFunc("DontMessWithMyCase", DontMessWithMyCase);
GetTable("Spring");
AddFunc("Echo", LuaUtils::Echo);
AddFunc("Log", LuaUtils::Log);
AddFunc("TimeCheck", TimeCheck);
EndTable();
GetTable("Engine");
LuaConstEngine::PushEntries(L);
EndTable();
GetTable("VFS");
AddFunc("DirList", DirList);
AddFunc("SubDirs", SubDirs);
AddFunc("Include", Include);
AddFunc("LoadFile", LoadFile);
AddFunc("FileExists", FileExists);
EndTable();
GetTable("LOG");
LuaUtils::PushLogEntries(L);
EndTable();
}
/******************************************************************************/
bool LuaParser::Execute()
{
if (!IsValid()) {
errorLog = "could not initialize LUA library";
return false;
}
rootRef = LUA_NOREF;
assert(initDepth == 0);
initDepth = -1;
string code;
string codeLabel;
if (!textChunk.empty()) {
code = textChunk;
codeLabel = "text chunk";
}
else if (!fileName.empty()) {
codeLabel = fileName;
CFileHandler fh(fileName, fileModes);
if (!fh.LoadStringData(code)) {
errorLog = "could not open file: " + fileName;
LUA_CLOSE(&L);
return false;
}
}
else {
errorLog = "invalid format or empty file";
LUA_CLOSE(&L);
return false;
}
int error = luaL_loadbuffer(L, code.c_str(), code.size(), codeLabel.c_str());
if (error != 0) {
errorLog = lua_tostring(L, -1);
LOG_L(L_ERROR, "%i, %s, %s", error, codeLabel.c_str(), errorLog.c_str());
LUA_CLOSE(&L);
return false;
}
{
// LuaParser::Execute can be called concurrently by the
// game-load and (e.g.) assimp model preloading threads
// do not signal floating point exceptions in user Lua code
ScopedDisableFpuExceptions fe;
error = lua_pcall(L, 0, 1, 0);
if (error != 0) {
errorLog = lua_tostring(L, -1);
LOG_L(L_ERROR, "%i, %s, %s", error, fileName.c_str(), errorLog.c_str());
LUA_CLOSE(&L);
return false;
}
if (!lua_istable(L, 1)) {
errorLog = "missing return table from " + fileName;
LOG_L(L_ERROR, "missing return table from %s", fileName.c_str());
LUA_CLOSE(&L);
return false;
}
if (lowerKeys)
LuaUtils::LowerKeys(L, 1);
LuaUtils::CheckTableForNaNs(L, 1, fileName);
}
rootRef = luaL_ref(L, LUA_REGISTRYINDEX);
lua_settop(L, 0);
valid = true;
return true;
}
void LuaParser::AddTable(LuaTable* tbl) { spring::VectorInsertUnique(tables, tbl); }
void LuaParser::RemoveTable(LuaTable* tbl) { spring::VectorErase(tables, tbl); }
LuaTable LuaParser::GetRoot()
{
return LuaTable(this);
}
/******************************************************************************/
void LuaParser::PushParam()
{
if (!IsValid() || (initDepth < 0))
return;
if (initDepth > 0) {
lua_rawset(L, -3);
} else {
lua_rawset(L, LUA_GLOBALSINDEX);
}
}
void LuaParser::GetTable(const string& name, bool overwrite)
{
if (!IsValid() || (initDepth < 0))
return;
lua_pushsstring(L, name);
if (overwrite) {
lua_newtable(L);
}
else {
lua_pushsstring(L, name);
lua_gettable(L, (initDepth == 0) ? LUA_GLOBALSINDEX : -3);
if (!lua_istable(L, -1)) {
lua_pop(L, 1);
lua_newtable(L);
}
}
initDepth++;
}
void LuaParser::GetTable(int index, bool overwrite)
{
if (!IsValid() || (initDepth < 0))
return;
lua_pushnumber(L, index);
if (overwrite) {
lua_newtable(L);
} else {
lua_pushnumber(L, index);
lua_gettable(L, (initDepth == 0) ? LUA_GLOBALSINDEX : -3);
if (!lua_istable(L, -1)) {
lua_pop(L, 1);
lua_newtable(L);
}
}
initDepth++;
}
void LuaParser::EndTable()
{
if (!IsValid() || (initDepth < 0))
return;
assert(initDepth > 0);
initDepth--;
PushParam();
}
/******************************************************************************/
void LuaParser::AddFunc(const string& key, int (*func)(lua_State*))
{
if (!IsValid() || (initDepth < 0))
return;
if (func == nullptr)
return;
// can not use this; initDepth check in PushParam
// LuaPushNamedCFunc(L, key, func);
lua_pushsstring(L, key);
lua_pushcfunction(L, func);
// t[k] = v
PushParam();
}
void LuaParser::AddInt(const string& key, int value)
{
if (!IsValid() || (initDepth < 0))
return;
lua_pushsstring(L, key);
lua_pushnumber(L, value);
PushParam();
}
void LuaParser::AddBool(const string& key, bool value)
{
if (!IsValid() || (initDepth < 0))
return;
lua_pushsstring(L, key);
lua_pushboolean(L, value);
PushParam();
}
void LuaParser::AddFloat(const string& key, float value)
{
if (!IsValid() || (initDepth < 0))
return;
lua_pushsstring(L, key);
lua_pushnumber(L, value);
PushParam();
}
void LuaParser::AddString(const string& key, const string& value)
{
if (!IsValid() || (initDepth < 0))
return;
lua_pushsstring(L, key);
lua_pushsstring(L, value);
PushParam();
}
/******************************************************************************/
void LuaParser::AddFunc(int key, int (*func)(lua_State*))
{
if (!IsValid() || (initDepth < 0))
return;
if (func == nullptr)
return;
lua_pushnumber(L, key);
lua_pushcfunction(L, func);
PushParam();
}
void LuaParser::AddInt(int key, int value)
{
if (!IsValid() || (initDepth < 0))
return;
lua_pushnumber(L, key);
lua_pushnumber(L, value);
PushParam();
}
void LuaParser::AddBool(int key, bool value)
{
if (!IsValid() || (initDepth < 0))
return;
lua_pushnumber(L, key);
lua_pushboolean(L, value);
PushParam();
}
void LuaParser::AddFloat(int key, float value)
{
if (!IsValid() || (initDepth < 0))
return;
lua_pushnumber(L, key);
lua_pushnumber(L, value);
PushParam();
}
void LuaParser::AddString(int key, const string& value)
{
if (!IsValid() || (initDepth < 0))
return;
lua_pushnumber(L, key);
lua_pushsstring(L, value);
PushParam();
}
/******************************************************************************/
/******************************************************************************/
//
// call-outs
//
int LuaParser::TimeCheck(lua_State* L)
{
if (!lua_isstring(L, 1) || !lua_isfunction(L, 2))
luaL_error(L, "Invalid arguments to TimeCheck('string', func, ...)");
const string name = lua_tostring(L, 1);
lua_remove(L, 1);
const spring_time startTime = spring_gettime();
if (lua_pcall(L, lua_gettop(L) - 1, LUA_MULTRET, 0) != 0) {
const string errmsg = lua_tostring(L, -1);
lua_pop(L, 1);
luaL_error(L, errmsg.c_str());
}
const spring_time endTime = spring_gettime();
LOG("%s %ldms", name.c_str(), (long int) spring_tomsecs(endTime - startTime));
return lua_gettop(L);
}
/******************************************************************************/
// seeding makes little sense inside LuaParser execution
int LuaParser::RandomSeed(lua_State* L) { return (DummyRandomSeed(L)); }
int LuaParser::Random(lua_State* L)
{
// both US and DS depend on LuaParser via MapParser, etc
#if (!defined(UNITSYNC) && !defined(DEDICATED))
lua_pushnumber(L, gsRNG.NextFloat());
return 1;
#else
return (DummyRandom(L));
#endif
}
int LuaParser::DummyRandomSeed(lua_State* L) { return 0; }
int LuaParser::DummyRandom(lua_State* L) { return 0; }
/******************************************************************************/
int LuaParser::DirList(lua_State* L)
{
const LuaParser* currentParser = GetLuaParser(L);
const std::string& dir = luaL_checkstring(L, 1);
if (!LuaIO::IsSimplePath(dir))
return 0;
const std::string& pat = luaL_optstring(L, 2, "*");
const std::string& modes = CFileHandler::AllowModes(luaL_optstring(L, 3, currentParser->accessModes.c_str()), currentParser->accessModes);
LuaUtils::PushStringVector(L, CFileHandler::DirList(dir, pat, modes));
return 1;
}
int LuaParser::SubDirs(lua_State* L)
{
const LuaParser* currentParser = GetLuaParser(L);
const std::string& dir = luaL_checkstring(L, 1);
if (!LuaIO::IsSimplePath(dir))
return 0;
const std::string& pat = luaL_optstring(L, 2, "*");
const std::string& modes = CFileHandler::AllowModes(luaL_optstring(L, 3, currentParser->accessModes.c_str()), currentParser->accessModes);
LuaUtils::PushStringVector(L, CFileHandler::SubDirs(dir, pat, modes));
return 1;
}
/******************************************************************************/
int LuaParser::Include(lua_State* L)
{
const LuaParser* currentParser = GetLuaParser(L);
// filename [, fenv]
const std::string& filename = luaL_checkstring(L, 1);
if (!LuaIO::IsSimplePath(filename))
luaL_error(L, "bad pathname");
const std::string& modes = CFileHandler::AllowModes(luaL_optstring(L, 3, currentParser->accessModes.c_str()), currentParser->accessModes);
CFileHandler fh(filename, modes);
if (!fh.FileExists()) {
char buf[1024];
SNPRINTF(buf, sizeof(buf), "Include() file missing '%s'\n", filename.c_str());
lua_pushstring(L, buf);
lua_error(L);
}
string code;
if (!fh.LoadStringData(code)) {
char buf[1024];
SNPRINTF(buf, sizeof(buf), "Include() could not load '%s'\n", filename.c_str());
lua_pushstring(L, buf);
lua_error(L);
}
int error = luaL_loadbuffer(L, code.c_str(), code.size(), filename.c_str());
if (error != 0) {
char buf[1024];
SNPRINTF(buf, sizeof(buf), "error = %i, %s, %s\n", error, filename.c_str(), lua_tostring(L, -1));
lua_pushstring(L, buf);
lua_error(L);
}
// set the chunk's fenv to the current fenv, or a user table
if (lua_istable(L, 2)) {
lua_pushvalue(L, 2); // user fenv
} else {
LuaUtils::PushCurrentFuncEnv(L, __FUNCTION__);
}
// set the include fenv to the current function's fenv
if (lua_setfenv(L, -2) == 0) {
luaL_error(L, "Include(): error with setfenv");
}
const int paramTop = lua_gettop(L) - 1;
error = lua_pcall(L, 0, LUA_MULTRET, 0);
if (error != 0) {
char buf[1024];
SNPRINTF(buf, sizeof(buf), "error = %i, %s, %s\n", error, filename.c_str(), lua_tostring(L, -1));
lua_pushstring(L, buf);
lua_error(L);
}
#if 0
spring::VectorInsertUnique(currentParser->accessedFiles, StringToLower(filename), true);
#endif
return (lua_gettop(L) - paramTop);
}
/******************************************************************************/
int LuaParser::LoadFile(lua_State* L)
{
const LuaParser* currentParser = GetLuaParser(L);
const std::string& filename = luaL_checkstring(L, 1);
if (!LuaIO::IsSimplePath(filename))
return 0;
const std::string& modes = CFileHandler::AllowModes(luaL_optstring(L, 2, currentParser->accessModes.c_str()), currentParser->accessModes);
CFileHandler fh(filename, modes);
if (!fh.FileExists()) {
lua_pushnil(L);
lua_pushstring(L, "missing file");
return 2;
}
string data;
if (!fh.LoadStringData(data)) {
lua_pushnil(L);
lua_pushstring(L, "could not load data");
return 2;
}
lua_pushstring(L, data.c_str());
#if 0
spring::VectorInsertUnique(currentParser->accessedFiles, StringToLower(filename), true);
#endif
return 1;
}
int LuaParser::FileExists(lua_State* L)
{
const LuaParser* currentParser = GetLuaParser(L);
const std::string& filename = luaL_checkstring(L, 1);
if (!LuaIO::IsSimplePath(filename))
return 0;
lua_pushboolean(L, CFileHandler::FileExists(filename, currentParser->accessModes));
return 1;
}
int LuaParser::DontMessWithMyCase(lua_State* L)
{
LuaParser* currentParser = GetLuaParser(L);
currentParser->SetLowerKeys(lua_toboolean(L, 1));
return 0;
}
/******************************************************************************/
/******************************************************************************/
//
// LuaTable
//
LuaTable::LuaTable()
: path(""),
isValid(false),
parser(NULL),
L(NULL),
refnum(LUA_NOREF)
{
}
LuaTable::LuaTable(LuaParser* _parser)
{
assert(_parser != NULL);
isValid = _parser->IsValid();
path = "ROOT";
parser = _parser;
L = parser->L;
refnum = parser->rootRef;
parser->AddTable(this);
if (PushTable()) {
lua_pushvalue(L, -1); // copy
refnum = luaL_ref(L, LUA_REGISTRYINDEX);
} else {
refnum = LUA_NOREF;
}
isValid = (refnum != LUA_NOREF);
}
LuaTable::LuaTable(const LuaTable& tbl)
{
parser = tbl.parser;
L = tbl.L;
path = tbl.path;
if (parser != nullptr)
parser->AddTable(this);
if (tbl.PushTable()) {
lua_pushvalue(L, -1); // copy
refnum = luaL_ref(L, LUA_REGISTRYINDEX);
} else {
refnum = LUA_NOREF;
}
isValid = (refnum != LUA_NOREF);
}
LuaTable& LuaTable::operator=(const LuaTable& tbl)
{
if (parser != nullptr && (refnum != LUA_NOREF) && (parser->currentRef == refnum)) {
lua_settop(L, 0);
parser->currentRef = LUA_NOREF;
}
if (parser != tbl.parser) {
if (parser != nullptr)
parser->RemoveTable(this);
if (L != nullptr && (refnum != LUA_NOREF))
luaL_unref(L, LUA_REGISTRYINDEX, refnum);
if (tbl.parser != nullptr)
tbl.parser->AddTable(this);
parser = tbl.parser;
}
L = tbl.L;
path = tbl.path;
if (tbl.PushTable()) {
lua_pushvalue(L, -1); // copy
refnum = luaL_ref(L, LUA_REGISTRYINDEX);
} else {
refnum = LUA_NOREF;
}
isValid = (refnum != LUA_NOREF);
return *this;
}
LuaTable LuaTable::SubTable(int key) const
{
LuaTable subTable;
char buf[32];
SNPRINTF(buf, 32, "[%i]", key);
subTable.path = path + buf;
if (!PushTable())
return subTable;
lua_pushnumber(L, key);
lua_gettable(L, -2);
if (!lua_istable(L, -1)) {
lua_pop(L, 1);
return subTable;
}
subTable.parser = parser;
subTable.L = L;
subTable.refnum = luaL_ref(L, LUA_REGISTRYINDEX);
subTable.isValid = (subTable.refnum != LUA_NOREF);
parser->AddTable(&subTable);
return subTable;
}
LuaTable LuaTable::SubTable(const string& mixedKey) const
{
const string key = !(parser ? parser->lowerCppKeys : true) ? mixedKey : StringToLower(mixedKey);
LuaTable subTable;
subTable.path = path + "." + key;
if (!PushTable())
return subTable;
lua_pushstring(L, key.c_str());
lua_gettable(L, -2);
if (!lua_istable(L, -1)) {
lua_pop(L, 1);
return subTable;
}
subTable.parser = parser;
subTable.L = L;
subTable.refnum = luaL_ref(L, LUA_REGISTRYINDEX);
subTable.isValid = (subTable.refnum != LUA_NOREF);
parser->AddTable(&subTable);
return subTable;
}
LuaTable LuaTable::SubTableExpr(const string& expr) const
{
if (expr.empty()) {
return LuaTable(*this);
}
if (!isValid) {
return LuaTable();
}
string::size_type endPos;
LuaTable nextTable;
if (expr[0] == '[') { // numeric key
endPos = expr.find(']');
if (endPos == string::npos) {
return LuaTable(); // missing brace
}
const char* startPtr = expr.c_str() + 1; // skip the '['
char* endPtr;
const int index = strtol(startPtr, &endPtr, 10);
if (endPtr == startPtr) {
return LuaTable(); // invalid index
}
endPos++; // eat the ']'
nextTable = SubTable(index);
}
else { // string key
endPos = expr.find_first_of(".[");
if (endPos == string::npos) {
return SubTable(expr);
}
nextTable = SubTable(expr.substr(0, endPos));
}
if (expr[endPos] == '.') {
endPos++; // eat the dot
}
return nextTable.SubTableExpr(expr.substr(endPos));
}
LuaTable::~LuaTable()
{
if (parser != nullptr)
parser->RemoveTable(this);
if (L != nullptr && (refnum != LUA_NOREF)) {
luaL_unref(L, LUA_REGISTRYINDEX, refnum);
if (parser != nullptr && (parser->currentRef == refnum)) {
lua_settop(L, 0);
parser->currentRef = LUA_NOREF;
}
}
}
/******************************************************************************/
bool LuaTable::PushTable() const
{
if (!isValid)
return false;
if ((refnum != LUA_NOREF) && (parser->currentRef == refnum)) {
if (!lua_istable(L, -1)) {
LOG_L(L_ERROR, "Internal Error: LuaTable::PushTable() = %s", path.c_str());
parser->currentRef = LUA_NOREF;
lua_settop(L, 0);
return false;
}
return true;
}
lua_settop(L, 0);
lua_rawgeti(L, LUA_REGISTRYINDEX, refnum);
if (!lua_istable(L, -1)) {
isValid = false;
parser->currentRef = LUA_NOREF;
lua_settop(L, 0);
return false;
}
parser->currentRef = refnum;
return true;
}
bool LuaTable::PushValue(int key) const
{
if (!PushTable()) {
return false;
}
lua_pushnumber(L, key);
lua_gettable(L, -2);
if (lua_isnoneornil(L, -1)) {
lua_pop(L, 1);
return false;
}
return true;
}
bool LuaTable::PushValue(const string& mixedKey) const
{
const string key = !(parser ? parser->lowerCppKeys : true) ? mixedKey : StringToLower(mixedKey);
if (!PushTable()) {
return false;
}
const int top = lua_gettop(L);
if (key.find(".") != std::string::npos) {
// nested key (e.g. "subtable.subsub.mahkey")
size_t lastpos = 0;
size_t dotpos = key.find(".");
lua_pushvalue(L, -1);
do {
const std::string subTableName = key.substr(lastpos, dotpos);
lastpos = dotpos + 1;
dotpos = key.find(".", lastpos);
lua_pushsstring(L, subTableName);
lua_gettable(L, -2);
if (!lua_istable(L, -1)) {
lua_pop(L, 2);
const int newtop = lua_gettop(L);
assert(newtop == top);
return false;
}
lua_remove(L, -2);
} while (dotpos != std::string::npos);
const std::string keyname = key.substr(lastpos);
// try as string
lua_pushsstring(L, keyname);
lua_gettable(L, -2);
if (!lua_isnoneornil(L, -1)) {
lua_remove(L, -2);
const int newtop = lua_gettop(L);
assert(newtop == top + 1);
return true;
}
// try as integer
bool failed;
int i = StringToInt(keyname, &failed);
if (failed) {
lua_pop(L, 2);
const int newtop = lua_gettop(L);
assert(newtop == top);
return false;
}
lua_pop(L, 1); // pop nil
lua_pushnumber(L, i);
lua_gettable(L, -2);
if (!lua_isnoneornil(L, -1)) {
lua_remove(L, -2);
const int newtop = lua_gettop(L);
assert(newtop == top + 1);
return true;
}
lua_pop(L, 2);
const int newtop = lua_gettop(L);
assert(newtop == top);
return false;
}
lua_pushsstring(L, key);
lua_gettable(L, -2);
if (!lua_isnoneornil(L, -1)) {
const int newtop = lua_gettop(L);
assert(newtop == top + 1);
return true;
}
lua_pop(L, 1);
const int newtop = lua_gettop(L);
assert(newtop == top);
return false;
}
/******************************************************************************/
/******************************************************************************/
//
// Key existance testing
//
bool LuaTable::KeyExists(int key) const
{
if (!PushValue(key)) {
return false;
}
lua_pop(L, 1);
return true;
}
bool LuaTable::KeyExists(const string& key) const
{
if (!PushValue(key)) {