src/scripting/script_interpreter.cpp

   1 #include <config.h>
   2
   3 #include "script_interpreter.hpp"
   4
   5 #include <stdarg.h>
   6 #include <stdexcept>
   7 #include <sstream>
   8 #include <fstream>
   9 #include <sqstdio.h>
  10 #include <sqstdaux.h>
  11 #include <sqstdblob.h>
  12 #include <sqstdsystem.h>
  13 #include <sqstdmath.h>
  14 #include <sqstdstring.h>
  15
  16 #include "wrapper.hpp"
  17 #include "wrapper_util.hpp"
  18 #include "sector.hpp"
  19 #include "file_system.hpp"
  20 #include "game_session.hpp"
  21 #include "resources.hpp"
  22 #include "physfs/physfs_stream.hpp"
  23 #include "object/text_object.hpp"
  24 #include "object/scripted_object.hpp"
  25 #include "object/display_effect.hpp"
  26 #include "scripting/sound.hpp"
  27 #include "scripting/scripted_object.hpp"
  28 #include "scripting/display_effect.hpp"
  29
  30 static void printfunc(HSQUIRRELVM, const char* str, ...)
  31 {
  32   va_list arglist;
  33   va_start(arglist, str);
  34   vprintf(str, arglist);
  35   va_end(arglist);
  36 }
  37
  38 ScriptInterpreter* ScriptInterpreter::_current = 0;
  39
  40 ScriptInterpreter::ScriptInterpreter(const std::string& new_working_directory)
  41   : working_directory(new_working_directory), sound(0), level(0)
  42 {
  43   v = sq_open(1024);
  44   if(v == 0)
  45     throw std::runtime_error("Couldn't initialize squirrel vm");
  46
  47   // register default error handlers
  48   sqstd_seterrorhandlers(v);
  49   // register squirrel libs
  50   sq_pushroottable(v);
  51   if(sqstd_register_bloblib(v) < 0)
  52     throw SquirrelError(v, "Couldn't register blob lib");
  53   if(sqstd_register_iolib(v) < 0)
  54     throw SquirrelError(v, "Couldn't register io lib");
  55   if(sqstd_register_systemlib(v) < 0)
  56     throw SquirrelError(v, "Couldn't register system lib");
  57   if(sqstd_register_mathlib(v) < 0)
  58     throw SquirrelError(v, "Couldn't register math lib");
  59   if(sqstd_register_stringlib(v) < 0)
  60     throw SquirrelError(v, "Couldn't register string lib");
  61
  62   // register print function
  63   sq_setprintfunc(v, printfunc);
  64
  65   // register supertux API
  66   SquirrelWrapper::register_supertux_wrapper(v);
  67
  68   // expose some "global" objects
  69   sound = new Scripting::Sound();
  70   expose_object(sound, "Sound");
  71
  72   level = new Scripting::Level();
  73   expose_object(level, "Level");
  74 }
  75
  76 void
  77 ScriptInterpreter::register_sector(Sector* sector)
  78 {
  79   // expose ScriptedObjects to the script
  80   for(Sector::GameObjects::iterator i = sector->gameobjects.begin();
  81       i != sector->gameobjects.end(); ++i) {
  82     GameObject* object = *i;
  83     Scripting::ScriptedObject* scripted_object
  84       = dynamic_cast<Scripting::ScriptedObject*> (object);
  85     if(!scripted_object)
  86       continue;
  87
  88     expose_object(scripted_object, scripted_object->get_name());
  89   }
  90
  91   TextObject* text_object = new TextObject();
  92   sector->add_object(text_object);
  93   Scripting::Text* text = static_cast<Scripting::Text*> (text_object);
  94   expose_object(text, "Text");
  95
  96   DisplayEffect* display_effect = new DisplayEffect();
  97   sector->add_object(display_effect);
  98   Scripting::DisplayEffect* display_effect_api
  99     = static_cast<Scripting::DisplayEffect*> (display_effect);
 100   expose_object(display_effect_api, "DisplayEffect");
 101 }
 102
 103 ScriptInterpreter::~ScriptInterpreter()
 104 {
 105   sq_close(v);
 106   delete sound;
 107   delete level;
 108 }
 109
 110 static SQInteger squirrel_read_char(SQUserPointer file)
 111 {
 112   std::istream* in = reinterpret_cast<std::istream*> (file);
 113   char c = in->get();
 114   if(in->eof())
 115     return 0;
 116   return c;
 117 }
 118
 119 void
 120 ScriptInterpreter::run_script(std::istream& in, const std::string& sourcename,
 121         bool remove_when_terminated)
 122 {
 123   printf("Stackbefore:\n");
 124   print_squirrel_stack(v);
 125   if(sq_compile(v, squirrel_read_char, &in, sourcename.c_str(), true) < 0)
 126     throw SquirrelError(v, "Couldn't parse script");
 127
 128   _current = this;
 129   sq_push(v, -2);
 130   if(sq_call(v, 1, false) < 0)
 131     throw SquirrelError(v, "Couldn't start script");
 132   _current = 0;
 133   if(sq_getvmstate(v) != SQ_VMSTATE_SUSPENDED) {
 134     if(remove_when_terminated) {
 135       remove_me();
 136     }
 137     printf("ended.\n");
 138     // remove closure from stack
 139     sq_pop(v, 1);
 140   }
 141   printf("After:\n");
 142   print_squirrel_stack(v);
 143 }
 144
 145 void
 146 ScriptInterpreter::set_wakeup_time(float seconds)
 147 {
 148   wakeup_timer.start(seconds);
 149 }
 150
 151 void
 152 ScriptInterpreter::update(float )
 153 {
 154   if(!wakeup_timer.check())
 155     return;
 156
 157   _current = this;
 158   if(sq_wakeupvm(v, false, false) < 0)
 159     throw SquirrelError(v, "Couldn't resume script");
 160   _current = 0;
 161   if(sq_getvmstate(v) != SQ_VMSTATE_SUSPENDED) {
 162     printf("script ended...\n");
 163     remove_me();
 164   }
 165 }
 166
 167 void
 168 ScriptInterpreter::draw(DrawingContext& )
 169 {
 170 }
 171
 172 void
 173 ScriptInterpreter::add_script_object(Sector* sector, const std::string& name,
 174     const std::string& script)
 175 {
 176   try {
 177     std::string workdir = GameSession::current()->get_working_directory();
 178     std::auto_ptr<ScriptInterpreter> interpreter(
 179                 new ScriptInterpreter(workdir));
 180     interpreter->register_sector(sector);
 181
 182     // load default.nut file if it exists
 183     try {
 184       std::string filename = workdir + "/default.nut";
 185       IFileStream in(filename);
 186       interpreter->run_script(in, filename, false);
 187     } catch(std::exception& e) {
 188       // nothing
 189     }
 190
 191     std::istringstream in(script);
 192     interpreter->run_script(in, name);
 193     sector->add_object(interpreter.release());
 194   } catch(std::exception& e) {
 195     std::cerr << "Couldn't start '" << name << "' script: " << e.what() << "\n";
 196   }
 197 }
 198