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raze-gles/polymer/eduke32/source/lunatic/defs.ilua
helixhorned 17bac8cb55 Lunatic: "fix" building. 
git-svn-id: https://svn.eduke32.com/eduke32@3130 1a8010ca-5511-0410-912e-c29ae57300e0
2012-11-08 20:17:19 +00:00

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-- INTERNAL
-- definitions of BUILD and game types for the Lunatic Interpreter
_EDUKE32_LUNATIC = true
local ffi = require("ffi")
local ffiC = ffi.C
local string = string
local table = table
--== First, load the definitions common to the game's and editor's Lua interface.
-- The "gv" global will provide access to C global *scalars* and safe functions.
-- XXX: still exposes C library functions etc. contained in ffi.C, problem?
local gv_ = {
-- All non-scalars need to be explicitly listed here and access to them is
-- redirected to the dummy empty table...
}
local dummy_empty_table = {}
-- This is for declarations of arrays or pointers which should not be
-- accessible through the "gv" global. The "defs_common" module will
-- use this function.
--
-- NOTE: don't declare multiple pointers on one line (this is bad: "int32_t *a, *b")
-- and array *arguments* should be separated by a space, like
-- "int func(char arrayarg [16])"
function decl(str)
for varname in string.gmatch(str, "([%a_][%w_]*)[[(;]") do
-- print("DUMMY "..varname)
gv_[varname] = dummy_empty_table
end
ffi.cdef(str)
end
-- load them!
local defs_c = require("defs_common")
---=== EDuke32 game definitions ===---
-- array -> element flattening inside structs,
-- e.g. int32_t a[4] --> int32_t _a0, _a1, _a2, _a3;
local function repeat_n_elts(type, namebase, num)
local strbuf = { "const "..type.." " }
for i=1,num do
local str = namebase..tostring(i-1)
if (i < num) then
str = str..","
end
strbuf[#strbuf+1] = str
end
strbuf[#strbuf+1] = ";"
return table.concat(strbuf)
end
---- game structs ----
ffi.cdef[[
enum dukeinv_t {
GET_STEROIDS,
GET_SHIELD,
GET_SCUBA,
GET_HOLODUKE,
GET_JETPACK,
GET_DUMMY1,
GET_ACCESS,
GET_HEATS,
GET_DUMMY2,
GET_FIRSTAID,
GET_BOOTS,
GET_MAX
};
enum dukeweapon_t {
KNEE_WEAPON,
PISTOL_WEAPON,
SHOTGUN_WEAPON,
CHAINGUN_WEAPON,
RPG_WEAPON,
HANDBOMB_WEAPON,
SHRINKER_WEAPON,
DEVISTATOR_WEAPON,
TRIPBOMB_WEAPON,
FREEZE_WEAPON,
HANDREMOTE_WEAPON,
GROW_WEAPON,
MAX_WEAPONS
};
enum {
MAXPLAYERS = 16,
};
]]
ffi.cdef([[
#pragma pack(push,1)
struct action {
int16_t startframe, numframes;
int16_t viewtype, incval, delay;
};
struct move {
int16_t hvel, vvel;
};
typedef struct { int32_t id; struct move mv; } con_move_t;
typedef struct { int32_t id; struct action ac; } con_action_t;
typedef struct {
int32_t id;
con_action_t act;
con_move_t mov;
int32_t movflags;
} con_ai_t;
// TODO: still need to make some fields read-only
// NOTE: must not expose arrays in structs!!!
typedef struct
{
]]
..repeat_n_elts("int32_t", "_t", 10)..
[[
// const int32_t t_data[10]; // 56b sometimes used to hold offsets to con code
const struct move mv;
const struct action ac;
const int16_t _padding;
int16_t picnum,ang,extra,owner; //8b
int16_t movflag,tempang,timetosleep; //6b
int32_t flags, bposx,bposy,bposz; //16b
int32_t floorz,ceilingz,lastvx,lastvy; //16b
int32_t lasttransport; //4b
const int16_t lightId, lightcount, lightmaxrange, cgg; //8b
int16_t actorstayput, dispicnum, shootzvel; // 6b
]]
..repeat_n_elts("int8_t", "_d", 8)..
[[
// const int8_t _do_not_use[8];
} actor_t;
// The _u_t versions are unrestricted variants for internal use.
typedef struct
{
int32_t t_data[10];
struct move mv;
struct action ac;
const int16_t padding_;
int16_t picnum,ang,extra,owner;
int16_t movflag,tempang,timetosleep;
int32_t flags, bposx,bposy,bposz;
int32_t floorz,ceilingz,lastvx,lastvy;
int32_t lasttransport;
int16_t lightId, lightcount, lightmaxrange, cgg;
int16_t actorstayput, dispicnum, shootzvel;
const int8_t _do_not_use[8];
} actor_u_t;
typedef struct {
vec3_t pos, opos, vel, npos;
int32_t bobposx, bobposy;
int32_t truefz, truecz, player_par;
int32_t randomflamex, exitx, exity;
int32_t runspeed, max_player_health, max_shield_amount;
int32_t autostep, autostep_sbw;
uint32_t interface_toggle_flag;
uint8_t palette;
uint16_t max_actors_killed, actors_killed;
uint16_t gotweapon, zoom;
]]
..repeat_n_elts("int16_t", "_lx", 64)..repeat_n_elts("int16_t", "_ly", 64)..
[[
// int16_t loogiex[64], loogiey[64];
int16_t sbs, sound_pitch;
int16_t ang, oang, angvel, cursectnum, look_ang, last_extra, subweapon;
]]
..repeat_n_elts("int16_t", "_ma", ffiC.MAX_WEAPONS)
..repeat_n_elts("int16_t", "_aa", ffiC.MAX_WEAPONS)
..repeat_n_elts("int16_t", "_ia", ffiC.GET_MAX)..
[[
// int16_t max_ammo_amount[MAX_WEAPONS], ammo_amount[MAX_WEAPONS], inv_amount[GET_MAX];
int16_t wackedbyactor, pyoff, opyoff;
int16_t horiz, horizoff, ohoriz, ohorizoff;
int16_t newowner, jumping_counter, airleft;
int16_t fta, ftq, access_wallnum, access_spritenum;
int16_t got_access, weapon_ang, visibility;
int16_t somethingonplayer, on_crane, i, one_parallax_sectnum;
int16_t random_club_frame, one_eighty_count;
int16_t dummyplayersprite, extra_extra8;
int16_t actorsqu, timebeforeexit, customexitsound, last_pissed_time;
]]
..repeat_n_elts("int16_t", "_w", ffiC.MAX_WEAPONS)..
[[
// int16_t weaprecs[MAX_WEAPONS];
int16_t weapon_sway, crack_time, bobcounter;
int16_t orotscrnang, rotscrnang, dead_flag; // JBF 20031220: added orotscrnang
int16_t holoduke_on, pycount;
int16_t transporter_hold;
uint8_t max_secret_rooms, secret_rooms;
uint8_t frag, fraggedself, quick_kick, last_quick_kick;
uint8_t return_to_center, reloading, weapreccnt;
uint8_t aim_mode, auto_aim, weaponswitch, movement_lock, team;
uint8_t tipincs, hbomb_hold_delay, frag_ps, kickback_pic;
uint8_t gm, on_warping_sector, footprintcount, hurt_delay;
uint8_t hbomb_on, jumping_toggle, rapid_fire_hold, on_ground;
uint8_t inven_icon, buttonpalette, over_shoulder_on, show_empty_weapon;
uint8_t jetpack_on, spritebridge, lastrandomspot;
uint8_t scuba_on, footprintpal, heat_on, invdisptime;
uint8_t holster_weapon, falling_counter, footprintshade;
uint8_t refresh_inventory, last_full_weapon;
uint8_t toggle_key_flag, knuckle_incs, knee_incs, access_incs;
uint8_t walking_snd_toggle, palookup, hard_landing, fist_incs;
int8_t numloogs, loogcnt, scream_voice;
int8_t last_weapon, cheat_phase, weapon_pos, wantweaponfire, curr_weapon;
palette_t pals;
]]
..repeat_n_elts("char", "_n", 32)..
[[
// char name[32];
int8_t padding_;
} DukePlayer_t;
typedef struct {
uint32_t bits; // 4b
int16_t fvel, svel; // 4b
int8_t avel, horz; // 2b
int8_t extbits, filler; // 2b
} input_t;
typedef struct {
DukePlayer_t *ps;
input_t *sync;
int32_t netsynctime;
int16_t ping, filler;
int32_t pcolor, pteam;
uint8_t frags[MAXPLAYERS], wchoice[MAX_WEAPONS];
char vote, gotvote, pingcnt, playerquitflag, ready;
char user_name[32];
uint32_t revision;
} playerdata_t;
#pragma pack(pop)
enum
{
MAXMOUSEBUTTONS = 10,
MAXMOUSEAXES = 2,
MAXJOYBUTTONS = (32+4),
MAXJOYAXES = 8,
NUMGAMEFUNCTIONS = 56,
};
// NOTE: not packed!
typedef struct {
vec3_t camera;
int32_t const_visibility,uw_framerate;
int32_t camera_time,folfvel,folavel,folx,foly,fola;
int32_t reccnt,crosshairscale;
int32_t runkey_mode,statusbarscale,mouseaiming,weaponswitch,drawweapon; // JBF 20031125
int32_t democams,color,msgdisptime,statusbarmode;
int32_t m_noexits,noexits,autovote,automsg,idplayers;
int32_t team, viewbob, weaponsway, althud, weaponscale, textscale;
int32_t entered_name,screen_tilting,shadows,fta_on,executions,auto_run;
int32_t coords,tickrate,levelstats,m_coop,coop,screen_size,lockout,crosshair;
int32_t playerai,angleinterpolation,obituaries;
int32_t respawn_monsters,respawn_items,respawn_inventory,recstat,monsters_off,brightness;
int32_t m_respawn_items,m_respawn_monsters,m_respawn_inventory,m_recstat,m_monsters_off,detail;
int32_t m_ffire,ffire,m_player_skill,m_level_number,m_volume_number,multimode;
int32_t player_skill,level_number,volume_number,m_marker,marker,mouseflip;
int32_t configversion;
int16_t cameraang, camerasect, camerahoriz;
int16_t pause_on,from_bonus;
int16_t camerasprite,last_camsprite;
int16_t last_level,secretlevel, bgstretch;
struct {
int32_t UseJoystick;
int32_t UseMouse;
int32_t AutoAim;
int32_t ShowOpponentWeapons;
int32_t MouseDeadZone,MouseBias;
int32_t SmoothInput;
// JBF 20031211: Store the input settings because
// (currently) jmact can't regurgitate them
int32_t MouseFunctions[MAXMOUSEBUTTONS][2];
int32_t MouseDigitalFunctions[MAXMOUSEAXES][2];
int32_t MouseAnalogueAxes[MAXMOUSEAXES];
int32_t MouseAnalogueScale[MAXMOUSEAXES];
int32_t JoystickFunctions[MAXJOYBUTTONS][2];
int32_t JoystickDigitalFunctions[MAXJOYAXES][2];
int32_t JoystickAnalogueAxes[MAXJOYAXES];
int32_t JoystickAnalogueScale[MAXJOYAXES];
int32_t JoystickAnalogueDead[MAXJOYAXES];
int32_t JoystickAnalogueSaturate[MAXJOYAXES];
uint8_t KeyboardKeys[NUMGAMEFUNCTIONS][2];
//
// Sound variables
//
int32_t FXDevice;
int32_t MusicDevice;
int32_t FXVolume;
int32_t MusicVolume;
int32_t SoundToggle;
int32_t MusicToggle;
int32_t VoiceToggle;
int32_t AmbienceToggle;
int32_t NumVoices;
int32_t NumChannels;
int32_t NumBits;
int32_t MixRate;
int32_t ReverseStereo;
//
// Screen variables
//
int32_t ScreenMode;
int32_t ScreenWidth;
int32_t ScreenHeight;
int32_t ScreenBPP;
int32_t ForceSetup;
int32_t NoAutoLoad;
int32_t scripthandle;
int32_t setupread;
int32_t CheckForUpdates;
int32_t LastUpdateCheck;
int32_t useprecache;
} config;
char overhead_on,last_overhead,showweapons;
char god,warp_on,cashman,eog,showallmap;
char show_help,scrollmode,noclip;
char ridecule[10][40];
char savegame[10][22];
char pwlockout[128],rtsname[128];
char display_bonus_screen;
char show_level_text;
} user_defs;
]])
decl[[
const char *g_sizes_of_what[];
int32_t g_sizes_of[];
actor_t actor[MAXSPRITES];
user_defs ud;
playerdata_t g_player[MAXPLAYERS];
const int32_t playerswhenstarted;
]]
-- functions
decl[[
int32_t kopen4loadfrommod(const char *filename, char searchfirst);
int32_t kfilelength(int32_t handle);
void kclose(int32_t handle);
int32_t kread(int32_t handle, void *buffer, int32_t leng);
]]
-- JKISS PRNG state struct and functions, see randgen module
ffi.cdef[[
typedef struct {
uint32_t x, y, z, c;
} rng_jkiss_t;
]]
decl[[
uint32_t rand_jkiss_u32(rng_jkiss_t *s);
double rand_jkiss_dbl(rng_jkiss_t *s);
void md4once(const unsigned char *block, unsigned int len, unsigned char digest [16]);
]]
-- ^^^ The space between 'digest' and '[16]' is so that it's not added to the
-- dummy_empty_table (see regexp in decl()).
local assert = assert
local error = error
local ipairs = ipairs
local loadstring = loadstring
local pairs = pairs
local print = print
local rawget = rawget
local rawset = rawset
local setmetatable = setmetatable
local setfenv = setfenv
local type = type
-- http://lua-users.org/wiki/SandBoxes says "potentially unsafe"
-- as it allows to see implementations of functions.
--local string_dump = string.dump
string.dump = nil
-- sanity-check struct type sizes
local good = true
for i=0,6 do
local what = ffi.string(ffiC.g_sizes_of_what[i])
local fsz = ffi.sizeof(what)
local csz = ffiC.g_sizes_of[i]
-- print(i..": "..what..": C sizeof = "..tostring(csz)..", FFI sizeof = "..tostring(fsz))
if (fsz ~= csz) then
good = false;
end
end
if (not good) then
error("Some sizes don't match between C and LuaJIT/FFI.")
end
--== Custom operations for BUILD data structures ==--
-- declares struct action and struct move, and their ID-wrapped types
-- con_action_t and con_move_t
local con = require("control")
-- All-zero action and move
local nullac, nullmv = ffi.new("const struct action"), ffi.new("const struct move")
local function check_literal_am(am, typename)
if (type(am) ~= "number") then
error("bad argument: expected number or "..typename, 3)
end
if (not (am >= 0 and am <= 32767)) then
error("bad argument: expected number in [0 .. 32767]", 3)
end
end
local actor_ptr_ct = ffi.typeof("actor_u_t *") -- an unrestricted actor_t pointer
local con_action_ct = ffi.typeof("con_action_t")
local con_move_ct = ffi.typeof("con_move_t")
local con_ai_ct = ffi.typeof("con_ai_t")
local actor_mt = {
__index = {
-- action
set_action = function(a, act)
a = ffi.cast(actor_ptr_ct, a)
if (ffi.istype(con_action_ct, act)) then
a.t_data[4] = act.id
a.ac = act.ac
else
check_literal_am(act, "action")
a.t_data[4] = act
a.ac = nullac
end
a.t_data[2] = 0
a.t_data[3] = 0
end,
has_action = function(a, act)
a = ffi.cast(actor_ptr_ct, a)
if (ffi.istype(con_action_ct, act)) then
return (a.t_data[4]==act.id)
else
check_literal_am(act, "action")
return (a.t_data[4]==act)
end
end,
-- count
set_count = function(a)
ffi.cast(actor_ptr_ct, a).t_data[0] = 0
end,
get_count = function(a)
return ffi.cast(actor_ptr_ct, a).t_data[0]
end,
-- action count
reset_acount = function(a)
ffi.cast(actor_ptr_ct, a).t_data[2] = 0
end,
get_acount = function(a)
return ffi.cast(actor_ptr_ct, a).t_data[2]
end,
-- move
set_move = function(a, mov, movflags)
a = ffi.cast(actor_ptr_ct, a)
if (ffi.istype(con_move_ct, mov)) then
a.t_data[1] = mov.id
a.mv = mov.mv
else
check_literal_am(mov, "move")
a.t_data[1] = mov
a.mv = nullmv
end
a.t_data[0] = 0
local i = a-ffi.cast(actor_ptr_ct, ffiC.actor[0])
ffiC.sprite[i].hitag = movflags or 0
-- TODO: random angle moveflag
end,
has_move = function(a, mov)
a = ffi.cast(actor_ptr_ct, a)
if (ffi.istype(con_move_ct, mov)) then
return (a.t_data[1]==mov.id)
else
check_literal_am(mov, "move")
return (a.t_data[1]==mov)
end
end,
-- ai
set_ai = function(a, ai)
local oa = a
a = ffi.cast(actor_ptr_ct, a)
-- TODO: literal number AIs?
if (not ffi.istype(con_ai_ct, ai)) then
error("bad argument: expected ai", 2)
end
-- NOTE: compare with gameexec.c
a.t_data[5] = ai.id
oa:set_action(ai.act)
oa:set_move(ai.mov, ai.movflags)
a.t_data[0] = 0
end,
has_ai = function(a, ai)
a = ffi.cast(actor_ptr_ct, a)
if (ffi.istype(con_ai_ct, ai)) then
return (a.t_data[5]==ai.id)
else
check_literal_am(ai, "ai")
return (a.t_data[5]==ai)
end
end,
},
}
ffi.metatype("actor_t", actor_mt)
--- default defines
local con_lang = require("con_lang")
for i=1,#con_lang.labels do
local strbuf = {"enum {"}
for label, val in pairs(con_lang.labels[i]) do
strbuf[#strbuf+1] = string.format("%s = %d,", label, val)
end
strbuf[#strbuf+1] = "};"
ffi.cdef(table.concat(strbuf))
end
---=== Set up restricted global environment ===---
gv_tmp = gv_ -- required by randgen
local allowed_modules = {
coroutine=coroutine, bit=bit, table=table, math=math, string=string,
os = {
clock = function() return gv_.gethitickms()*0.001 end,
},
randgen = require("randgen"),
geom = require("geom"),
stat = require("stat"),
bitar = require("bitar"),
con = con,
}
for modname, themodule in pairs(allowed_modules) do
local mt = {
__index = themodule,
__newindex = function(tab,idx,val)
error("modifying base module table forbidden", 2)
end,
__metatable = true,
}
-- Comment out to make base modules not protected:
allowed_modules[modname] = setmetatable({}, mt)
end
local function check_valid_modname(modname, errlev)
if (type(modname) ~= "string") then
error("module name must be a string", errlev+1)
end
-- TODO: restrict valid names?
end
local function errorf(level, fmt, ...)
local errmsg = string.format(fmt, ...)
error(errmsg, level+1)
end
local package_loaded = {}
local modname_stack = {}
local ERRLEV = 5
local function readintostr(fn)
-- XXX: this is pretty much the same as the code in El_RunOnce()
local fd = ffiC.kopen4loadfrommod(fn, 0) -- TODO: g_loadFromGroupOnly
if (fd < 0) then
errorf(ERRLEV, "Couldn't open file \"%s\"", fn)
end
local sz = ffiC.kfilelength(fd)
if (sz == 0) then
ffiC.kclose(fd)
errorf(ERRLEV, "Didn't load module \"%s\": zero-length file", fn)
end
if (sz < 0) then
ffi.kclose(fd)
error("INTERNAL ERROR: kfilelength() returned negative length", 5)
end
local str = ffi.new("char [?]", sz) -- XXX: what does it do on out of mem?
local readlen = ffiC.kread(fd, str, sz)
ffiC.kclose(fd); fd=-1
if (readlen ~= sz) then
errorf(ERRLEV, "INTERNAL ERROR: couldn't read \"%s\" wholly", fn)
end
return ffi.string(str, sz)
end
-- The "require" function accessible to Lunatic code.
-- Base modules in allowed_modules are wrapped so that they cannot be
-- modified, user modules are searched in the EDuke32 search
-- path. Also, our require never messes with the global environment,
-- it only returns the module.
local function our_require(modname)
check_valid_modname(modname, 2)
-- see whether it's a base module name first
if (allowed_modules[modname] ~= nil) then
return allowed_modules[modname]
end
--- search user modules
if (package_loaded[modname] ~= nil) then
-- already loaded
return package_loaded[modname]
end
-- TODO: better pattern-matching (permit "", ".lua", ".elua" ?)
local str = readintostr(modname .. ".lua")
local modfunc, errmsg = loadstring(str)
if (modfunc == nil) then
errorf(ERRLEV-1, "Couldn't load \"%s\": %s", modname, errmsg)
end
package_loaded[modname] = true
table.insert(modname_stack, modname)
-- Run the module code!
modfunc(modname) -- TODO: call protected and report errors here later
table.remove(modname_stack)
local modtab = package_loaded[modname]
if (type(modtab) == "table") then
-- Protect module table if there is one...
local mt = {
__index = modtab,
__newindex = function(tab,idx,val)
error("modifying module table forbidden", 2)
end,
}
setmetatable(modtab, mt)
end
return modtab
end
-- _G tweaks -- pull in only 'safe' stuff
local G_ = {} -- our soon-to-be global environment
local module_mt = {
__index = function (_, n)
error("attempt to read undeclared variable '"..n.."'", 2)
end,
}
-- Our 'module' replacement doesn't get the module name from the function args
-- since a malicious user could remove other loaded modules this way.
-- TODO: make transactional?
local function our_module()
local modname = modname_stack[#modname_stack]
if (type(modname) ~= "string") then
error("'module' must be called at the top level of a require'd file", 2)
end
local M = setmetatable({}, module_mt)
package_loaded[modname] = M
-- change the environment of the function which called us:
setfenv(2, M)
end
-- overridden 'error' that always passes a string to the base 'error'
local function our_error(errmsg, level)
if (type(errmsg) ~= "string") then
error("error using 'error': error message must be a string", 2)
end
if (level) then
if (type(level) ~= "number") then
error("error using 'error': error level must be a number", 2)
end
error(errmsg, level==0 and 0 or level+1)
end
error(errmsg, 2)
end
G_.assert = assert
G_.error = our_error
G_.ipairs = ipairs
G_.pairs = pairs
G_.pcall = pcall
G_.print = print -- TODO: --> initprintf or OSD_Printf; why not needed on linux?
G_.module = our_module
G_.next = next
G_.require = our_require
G_.select = select
G_.tostring = tostring
G_.tonumber = tonumber
G_.type = type
G_.unpack = unpack
G_.xpcall = xpcall
G_._VERSION = _VERSION
-- Available through our 'require':
-- bit, coroutine, math, string, table
-- Not available:
-- collectgarbage, debug, dofile, gcinfo (DEPRECATED), getfenv, getmetatable,
-- jit, load, loadfile, loadstring, newproxy (NOT STD?), package, rawequal,
-- rawget, rawset, setfenv, setmetatable
G_._G = G_
--- non-default data and functions
G_._EDUKE32_LUNATIC = _EDUKE32_LUNATIC
G_.gameevent = gameevent -- included in lunatic.c
G_.gameactor = gameactor -- included in lunatic.c
---=== Lunatic interpreter setup ===---
local lunacon = require("lunacon")
-- change the environment of this chunk to the table G_
-- NOTE: all references to global variables from this point on
-- (also in functions created after this point) refer to G_ !
setfenv(1, G_)
-- Print keys and values of a table.
-- REMEMBER special position of 'tostring' (it's looked up and used as a global
-- from 'print')
local function printkv(label, table)
print("========== Keys and values of "..label.." ("..tostring(table)..")")
for k,v in pairs(table) do
print(k .. ': ' .. tostring(v))
end
print('----------')
end
--printkv('_G AFTER SETFENV', _G)
---=== Restricted access to C variables from Lunatic ===---
local setmtonce = defs_c.setmtonce
-- error(..., 2) is to blame the caller and get its line numbers
local tmpmt = {
__index = function() error('dummy variable: read access forbidden', 2) end,
__newindex = function() error('dummy variable: write access forbidden', 2) end,
}
setmtonce(dummy_empty_table, tmpmt)
gv = gv_
local tmpmt = {
__index = ffiC,
__newindex = function() error("cannot create new or write into existing fields of 'gv'", 2) end,
}
setmtonce(gv, tmpmt)
---- indirect C array access ----
local tmpmt = {
__index = function(tab, key)
if (key >= 0 and key < ffiC.playerswhenstarted) then
return ffiC.g_player[key].ps[0]
end
error('out-of-bounds player[] read access', 2)
end,
__newindex = function(tab, key, val) error('cannot write directly to player[] struct', 2) end,
}
player = setmtonce({}, tmpmt)
-- This will create 'sprite', 'wall', etc. HERE, i.e. in the environment of this chunk
defs_c.create_globals(_G)
actor = defs_c.creategtab(ffiC.actor, ffiC.MAXSPRITES, 'actor[]')
function TEMP_getvollev() -- REMOVE
return ffiC.ud.volume_number+1, ffiC.ud.level_number+1
end
---=== Game variables ===---
-- gamevarNames[name] is true if that gamevar was declared
local gamevarNames = {}
-- code for prohibiting initial assignments to create new variables,
-- based on 14.2 of PiL
function gamevar(name, initval) -- aka 'declare'
if (type(name) ~= "string") then
error("First argument to 'gamevar' must be a string", 2)
end
if (not string.match(name, "^[%a_][%w_]*$")) then
error("First argument to 'gamevar' must be a valid identifier", 2)
end
if (string.match(name, "^_")) then
error("Identifier names starting with an underscore are reserved", 2)
end
if (gamevarNames[name]) then
error(string.format("Duplicate declaration of identifier '%s'", name), 2)
end
if (rawget(G_, name) ~= nil) then
error(string.format("Identifier name '%s' is already used in the global environment", name), 2)
end
gamevarNames[name] = true
rawset(G_, name, initval or false)
end
---=== Serialization, from PiL with modifications ===---
local function basicSerialize(o)
if (type(o) == "number") then
if (o ~= o) then return "0/0" end -- nan
if (o == 1/0) then return "1/0" end -- inf
if (o == -1/0) then return "-1/0" end -- -inf
return tostring(o)
elseif (type(o) == "boolean") then
return tostring(o)
elseif (type(o) == "string") then
return string.format("%q", o)
end
end
-- will contain all gamevar tables as keys (and true as value)
local tmpgvtabs = {}
local function save(name, value, saved, strings)
saved = saved or {} -- initial value
strings[#strings+1] = name .. "="
local str = basicSerialize(value)
if (str ~= nil) then
strings[#strings+1] = str .. "\n"
elseif (type(value) == "table") then
if (saved[value]) then -- value already saved?
strings[#strings+1] = saved[value] .. "\n" -- use its previous name
else
saved[value] = name -- save name for next time
strings[#strings+1] = "{}\n" -- create a new table
for k,v in pairs(value) do -- save its fields
local keystr = basicSerialize(k)
if (keystr == nil) then
error("cannot save a " .. type(k) .. " as key of a table", 2);
end
local fieldname = string.format("%s[%s]", name, keystr)
if (type(v)=="table" and not tmpgvtabs[v]) then
error("cannot save \""..name..
"\": gamevar tables may only contain tables that are also gamevars", 2)
end
save(fieldname, v, saved, strings)
end
end
else
error("cannot save \""..name.."\", a " .. type(value), 2)
end
end
local function serializeGamevars()
local saved = {}
local strings = {}
for gvname,_ in pairs(gamevarNames) do
if (type(G_[gvname])=="table") then
tmpgvtabs[G_[gvname]] = true
end
end
-- TODO: catch errors in save()
for gvname,_ in pairs(gamevarNames) do
save(gvname, G_[gvname], saved, strings)
end
strings[#strings+1] = "\n"
tmpgvtabs = {}
return table.concat(strings)
end
local function loadGamevarsString(string)
--[=[
for gvname,_ in pairs(gamevarNames) do
G_[gvname] = nil;
end
gamevarNames = {}; -- clear gamevars
--]=]
assert(loadstring(string))()
end
-- REMOVE this for release
DBG_ = {}
DBG_.printkv = printkv
DBG_.loadstring = loadstring
DBG_.serializeGamevars = serializeGamevars
DBG_.loadGamevarsString = loadGamevarsString
---=== Finishing environment setup ===---
--printkv('_G AFTER DECLS', _G)
-- PiL 14.2 continued
-- We need this at the end because we were previously doing just that!
setmetatable(
G_, {
__newindex = function (_1, n, _2)
error("attempt to write to undeclared variable '"..n.."'", 2)
end,
__index = function (_, n)
error("attempt to read undeclared variable '"..n.."'", 2)
end,
})
-- Change the environment of the running Lua thread so that everything
-- what we've set up will be available when this chunk is left.
-- In particular, we need the functions defined after setting this chunk's
-- environment earlier.
setfenv(0, _G)
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