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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* 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. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "common/lua/lua.h"
#include "common/lua/lauxlib.h"
#include "common/lua/lualib.h"
#include "common/debug.h"
#include "hdb/lua-script.h"
namespace HDB {
LuaScript::LuaScript() {
_state = NULL;
_systemInit = false;
}
LuaScript::~LuaScript() {
if (_state) {
lua_close(_state);
}
}
/*bool LuaScript::init() {
// Create new lua_State and initialize the Std Libs
_state = luaL_newstate();
if (!_state || !registerStdLibs()) {
error("Cannot initialize Lua");
return false;
}
_systemInit = true;
return true;
}*/
/*
Called from Lua, this will pop into the menu
*/
static int gotoMenu(lua_State *L) {
g_hdb->changeGameState();
return 0;
}
struct VarInit {
char *realName;
char *luaName;
} luaGlobalStrings[] = {
{ "Map00", "MAP00"},
{NULL, NULL}
};
// For AI States, to be implemented
struct NumberInit {
int value;
char *luaName;
} luaGlobalValues[] = {
{NULL, NULL}
};
struct FuncInit {
char *luaName;
int (*function) (lua_State *L);
} luaFuncs[] = {
{"GotoMenu", gotoMenu},
{NULL, NULL}
};
bool LuaScript::initScript(Common::SeekableReadStream *stream, const char *name, int32 length) {
if (_systemInit) {
return false;
}
// Initialize Lua Environment
_state = lua_open();
if (_state == NULL) {
error("Couldn't initialize Lua script.");
return false;
}
luaL_openlibs(_state);
_systemInit = true;
// Register Extensions
for (int i = 0; luaFuncs[i].luaName; i++) {
lua_register(_state, luaFuncs[i].luaName, luaFuncs[i].function);
}
// Register Lua Globals
for (int i = 0; luaGlobalStrings[i].realName; i++) {
lua_pushstring(_state, luaGlobalStrings[i].realName);
lua_setglobal(_state, luaGlobalStrings[i].luaName);
}
for (int j = 0; luaGlobalValues[j].luaName; j++) {
lua_pushnumber(_state, luaGlobalValues[j].value);
lua_setglobal(_state, luaGlobalValues[j].luaName);
}
/*
TODO: Set the last mapName as a global
after implementing the map-manager.
*/
// Set the lowest printable line
lua_pushnumber(_state, 480 - 14);
lua_setglobal(_state, "BOTTOM_Y");
/*
TODO: Load the sound names and entity
spawn names into Lua once they are implemented.
*/
/*
TODO: Find what from where the global.lua
is to be loaded, and execute it.
*/
// Load script and execute it
if (!executeMPC(stream, "level code", length)) {
error("LuaScript::initScript: 'level code' failed to execute");
return false;
}
lua_getglobal(_state, "level_init");
lua_pcall(_state, 0, 0, 0);
return true;
}
bool LuaScript::executeMPC(Common::SeekableReadStream *stream, const char *name, int32 length) {
if (!_systemInit) {
return false;
}
char *chunk = new char[length];
stream->read((void *)chunk, length);
// Remove C-Style comments from script
stripComments(chunk);
if (!executeChunk(chunk, length, name)) {
delete[] chunk;
return false;
}
delete[] chunk;
return true;
}
/*bool LuaScript::executeFile(const Common::String &filename) {
if (!_systemInit) {
return false;
}
Common::File *file = new Common::File;
if (!file->open(filename)) {
error("Cannot find \"%s\"", filename.c_str());
}
uint fileSize = file->size();
const char *fileData = new char[fileSize];
file->read((void *)fileData, fileSize);
if (!executeChunk(fileData, fileSize, filename)) {
delete[] fileData;
delete file;
return false;
}
delete[] fileData;
delete file;
return true;
}*/
bool LuaScript::executeChunk(const char *chunk, uint chunkSize, const Common::String &chunkName) const {
if (!_systemInit) {
return false;
}
// Compile Chunk
if (luaL_loadbuffer(_state, chunk, chunkSize, chunkName.c_str())) {
error("Couldn't compile \"%s\": %s", chunkName.c_str(), lua_tostring(_state, -1));
lua_pop(_state, -1);
return false;
}
// Execute Chunk
if (lua_pcall(_state, 0, 0, 0)) {
error("An error occured while executing \"%s\": %s.", chunkName.c_str(), lua_tostring(_state, -1));
lua_pop(_state, -1);
return false;
}
return true;
}
void LuaScript::stripComments(char *chunk) {
uint32 offset = 0;
while (chunk[offset]) {
if (chunk[offset] == '/' && chunk[offset + 1] == '/') {
while (chunk[offset] != 0x0d) {
chunk[offset++] = ' ';
}
}
offset++;
}
}
}
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