1 #ifndef _library__lua_base__hpp__included__
2 #define _library__lua_base__hpp__included__
9 #include <unordered_map>
15 #include "lua-version.hpp"
31 const static unsigned trampoline_upvals
= 2;
32 //Auxillary type for store-tag.
33 template<typename T
> struct _store_tag
37 _store_tag(T
& a
, T v
) : addr(a
), val(v
) {}
39 //Auxillary type for vararg-tag.
42 std::list
<std::string
> args
;
43 vararg_tag(std::list
<std::string
>& _args
) : args(_args
) {}
44 int pushargs(state
& L
);
47 //Auxillary type for numeric-tag.
48 template<typename T
> struct _numeric_tag
51 _numeric_tag(T v
) : val(v
) {}
54 //Auxillary type for fnptr-tag.
55 template<typename T
> struct _fnptr_tag
57 int(*fn
)(state
& L
, T v
);
59 _fnptr_tag(int (*f
)(state
& L
, T v
), T v
) : fn(f
), val(v
) {}
62 //Auxillary type for fn-tag.
63 template<typename T
> struct _fn_tag
66 _fn_tag(T f
) : fn(f
) {}
70 * Callback parameter: Don't pass any real parameter, but instead store specified value in specified
73 * Parameter a: The location to store value to.
74 * Parameter v: The value to store.
75 * Returns: The parameter structure.
77 template<typename T
> static struct _store_tag
<T
> store_tag(T
& a
, T v
) { return _store_tag
<T
>(a
, v
); }
79 * Callback parameter: Pass numeric value.
81 * Parameter v: The value to pass.
82 * Returns: The parameter structure.
84 template<typename T
> static struct _numeric_tag
<T
> numeric_tag(T v
) { return _numeric_tag
<T
>(v
); }
87 * Callback parameter: Execute function to push more parameters.
89 * Parameter f: The function to execute. The return value is number of additional parameters pushed.
90 * Parameter v: The value to pass to function.
91 * Returns: The parameter structure.
93 template<typename T
> static struct _fnptr_tag
<T
> fnptr_tag(int (*f
)(state
& L
, T v
), T v
)
95 return _fnptr_tag
<T
>(f
, v
);
99 * Callback parameter: Execute function to push more parameters.
101 * Parameter v: The functor to execute. Passed reference to the Lua state. The return value is number of
102 * additional parameters pushed.
103 * Returns: The parameter structure.
105 template<typename T
> static struct _fn_tag
<T
> fn_tag(T v
) { return _fn_tag
<T
>(v
); }
108 * Callback parameter: Pass boolean argument.
110 * Parameter v: The boolean value to pass.
112 struct boolean_tag
{ bool val
; boolean_tag(bool v
) : val(v
) {}};
115 * Callback parameter: Pass string argument.
117 * Parameter v: The string value to pass.
119 struct string_tag
{ std::string val
; string_tag(const std::string
& v
) : val(v
) {}};
122 * Callback parameter: Pass nil argument.
124 struct nil_tag
{ nil_tag() {}};
126 template<typename U
, typename
... T
> void _callback(int argc
, _store_tag
<U
> tag
, T
... args
)
129 _callback(argc
, args
...);
133 template<typename
... T
> void _callback(int argc
, vararg_tag tag
, T
... args
)
135 int e
= tag
.pushargs(*this);
136 _callback(argc
+ e
, args
...);
139 template<typename
... T
> void _callback(int argc
, nil_tag tag
, T
... args
)
142 _callback(argc
+ 1, args
...);
145 template<typename
... T
> void _callback(int argc
, boolean_tag tag
, T
... args
)
147 pushboolean(tag
.val
);
148 _callback(argc
+ 1, args
...);
151 template<typename
... T
> void _callback(int argc
, string_tag tag
, T
... args
)
153 pushlstring(tag
.val
);
154 _callback(argc
+ 1, args
...);
157 template<typename U
, typename
... T
> void _callback(int argc
, _numeric_tag
<U
> tag
, T
... args
)
160 _callback(argc
+ 1, args
...);
163 template<typename U
, typename
... T
> void _callback(int argc
, _fnptr_tag
<U
> tag
, T
... args
)
165 int extra
= tag
.fn(*this, tag
.val
);
166 _callback(argc
+ extra
, args
...);
169 template<typename U
, typename
... T
> void _callback(int argc
, _fn_tag
<U
> tag
, T
... args
)
171 int extra
= tag
.fn(*this);
172 _callback(argc
+ extra
, args
...);
175 void _callback(int argc
)
177 int r
= pcall(argc
, 0, 0);
178 if(r
== LUA_ERRRUN
) {
179 (stringfmt() << "Error running Lua callback: " << tostring(-1)).throwex();
182 if(r
== LUA_ERRMEM
) {
183 (stringfmt() << "Error running Lua callback: Out of memory").throwex();
186 if(r
== LUA_ERRERR
) {
187 (stringfmt() << "Error running Lua callback: Double Fault???").throwex();
193 * Create a new state.
195 state() throw(std::bad_alloc
);
197 * Create a new state with specified master state.
199 state(state
& _master
, lua_State
* L
);
205 * Get the internal state object.
207 * Return value: Internal state.
209 lua_State
* handle() { return lua_handle
; }
211 * Get the master state.
213 state
& get_master() { return master
? master
->get_master() : *this; }
215 * Set the internal state object.
217 void handle(lua_State
* l
) { lua_handle
= l
; }
221 void set_oom_handler(void (*oom
)()) { oom_handler
= oom
? oom
: builtin_oom
; }
223 * Set soft OOM handler.
225 void set_soft_oom_handler(void (*oom
)(int status
)) { soft_oom_handler
= oom
? oom
: builtin_soft_oom
; }
229 void reset() throw(std::runtime_error
, std::bad_alloc
);
233 void deinit() throw();
235 * Create a trampoline.
237 * Parameter fn The function to execute.
238 * Parameter n_upvals The number of extra upvalues besides the 2 used by trampoline itself. Popped from stack.
240 void push_trampoline(int(*fn
)(state
& L
), unsigned n_upvals
);
242 * Get specified trampoline upvalue index.
244 int trampoline_upval(int val
) { return lua_upvalueindex(trampoline_upvals
+ val
); }
246 * Set value of interruptable flag.
248 * Parameter flag: The flag.
250 void set_interruptable_flag(bool flag
)
252 if(master
) master
->set_interruptable_flag(flag
); else interruptable
= flag
;
255 * Get interruptable flag.
257 bool get_interruptable_flag()
259 if(master
) return master
->get_interruptable_flag(); else return interruptable
;
264 void set_memory_limit(size_t limit
)
266 if(master
) master
->set_memory_limit(limit
); else memory_limit
= limit
;
271 size_t get_memory_limit()
273 if(master
) return master
->get_memory_limit(); else return memory_limit
;
278 size_t get_memory_use()
280 if(master
) return master
->get_memory_use(); else return memory_use
;
283 * Charge against memory limit.
285 bool charge_memory(size_t amount
, bool release
);
287 * Execute function in interruptable mode.
289 * Parameter fn: The function to execute
290 * Parameter in: Number of slots to copy in.
291 * Parameter out: Number of slots to copy out.
293 void run_interruptable(std::function
<void()> fn
, unsigned in
, unsigned out
);
295 * Get a string argument.
297 * Parameter argindex: The stack index.
298 * Parameter fname: The name of function to use in error messages.
299 * Returns: The string.
300 * Throws std::runtime_error: The specified argument is not a string.
302 std::string
get_string(int argindex
, const std::string
& fname
) throw(std::runtime_error
, std::bad_alloc
)
305 (stringfmt() << "argument #" << argindex
<< " to " << fname
<< " must be string").throwex();
307 const char* f
= lua_tolstring(lua_handle
, argindex
, &len
);
309 (stringfmt() << "argument #" << argindex
<< " to " << fname
<< " must be string").throwex();
310 return std::string(f
, f
+ len
);
313 * Get a boolean argument.
315 * Parameter argindex: The stack index.
316 * Parameter fname: The name of function to use in error messages.
317 * Returns: The string.
318 * Throws std::runtime_error: The specified argument is not a boolean.
320 bool get_bool(int argindex
, const std::string
& fname
) throw(std::runtime_error
, std::bad_alloc
)
322 if(isnone(argindex
) || !isboolean(argindex
))
323 (stringfmt() << "argument #" << argindex
<< " to " << fname
<< " must be boolean").throwex();
324 return (lua_toboolean(lua_handle
, argindex
) != 0);
327 * Get a mandatory numeric argument.
329 * Parameter argindex: The stack index.
330 * Parameter fname: The name of function to use in error messages.
331 * Returns: The parsed number.
332 * Throws std::runtime_error: Bad type.
335 T
get_numeric_argument(int argindex
, const std::string
& fname
)
337 if(std::numeric_limits
<T
>::is_integer
) {
338 if(isnone(argindex
) || !isinteger(argindex
))
339 (stringfmt() << "Argument #" << argindex
<< " to " << fname
340 << " must be integer").throwex();
341 return static_cast<T
>(lua_tointeger(lua_handle
, argindex
));
343 if(isnone(argindex
) || !isnumber(argindex
))
344 (stringfmt() << "Argument #" << argindex
<< " to " << fname
345 << " must be numeric").throwex();
346 return static_cast<T
>(lua_tonumber(lua_handle
, argindex
));
350 * Get a optional numeric argument.
352 * Parameter argindex: The stack index.
353 * Parameter value: The place to store the value.
354 * Parameter fname: The name of function to use in error messages.
355 * Throws std::runtime_error: Bad type.
358 void get_numeric_argument(unsigned argindex
, T
& value
, const std::string
& fname
)
360 if(isnoneornil(argindex
))
362 if(std::numeric_limits
<T
>::is_integer
) {
363 if(isnone(argindex
) || !isinteger(argindex
))
364 (stringfmt() << "Argument #" << argindex
<< " to " << fname
<< " must be integer if "
365 "present").throwex();
366 value
= static_cast<T
>(lua_tointeger(lua_handle
, argindex
));
368 if(isnone(argindex
) || !isnumber(argindex
))
369 (stringfmt() << "Argument #" << argindex
<< " to " << fname
<< " must be numeric if "
370 "present").throwex();
371 value
= static_cast<T
>(lua_tonumber(lua_handle
, argindex
));
377 * Parameter name: The name of the callback.
378 * Parameter args: Arguments to pass to the callback.
380 template<typename
... T
>
381 bool callback(const std::string
& name
, T
... args
)
383 getglobal(name
.c_str());
385 if(t
!= LUA_TFUNCTION
) {
389 _callback(0, args
...);
395 * Parameter cblist: List of environment keys to do callbacks.
396 * Parameter args: Arguments to pass to the callback.
398 template<typename
... T
>
399 bool callback(const std::list
<char>& cblist
, T
... args
)
402 for(auto& i
: cblist
) {
403 pushlightuserdata(const_cast<char*>(&i
));
404 rawget(LUA_REGISTRYINDEX
);
406 if(t
!= LUA_TFUNCTION
) {
409 _callback(0, args
...);
416 * Add a group of functions.
418 void add_function_group(function_group
& group
);
420 * Add a group of classes.
422 void add_class_group(class_group
& group
);
426 void function_callback(const std::string
& name
, function
* func
);
430 void class_callback(const std::string
& name
, class_base
* func
);
432 * Do something just once per VM.
434 * Parameter key: The do-once key value.
435 * Returns: True if called the first time for given key on given VM, false otherwise.
437 bool do_once(void* key
);
444 callback_list(state
& L
, const std::string
& name
, const std::string
& fn_cbname
= "");
446 void _register(state
& L
); //Reads callback from top of lua stack.
447 void _unregister(state
& L
); //Reads callback from top of lua stack.
448 template<typename
... T
> bool callback(T
... args
) {
449 bool any
= L
.callback(callbacks
, args
...);
450 if(fn_cbname
!= "" && L
.callback(fn_cbname
, args
...))
454 const std::string
& get_name() { return name
; }
455 void clear() { callbacks
.clear(); }
457 callback_list(const callback_list
&);
458 callback_list
& operator=(const callback_list
&);
459 std::list
<char> callbacks
;
462 std::string fn_cbname
;
465 * Enumerate all callbacks.
467 std::list
<callback_list
*> get_callbacks();
469 * Register/Unregister a callback list.
471 void do_register(const std::string
& name
, callback_list
& callback
);
472 void do_unregister(const std::string
& name
, callback_list
& callback
);
474 //All kinds of Lua API functions.
475 void pop(int n
) { lua_pop(lua_handle
, n
); }
476 void* newuserdata(size_t size
) { return lua_newuserdata(lua_handle
, size
); }
477 int setmetatable(int index
) { return lua_setmetatable(lua_handle
, index
); }
478 int type(int index
) { return lua_type(lua_handle
, index
); }
479 void replace(int index
) { lua_replace(lua_handle
, index
); }
480 int getmetatable(int index
) { return lua_getmetatable(lua_handle
, index
); }
481 int rawequal(int index1
, int index2
) { return lua_rawequal(lua_handle
, index1
, index2
); }
482 void* touserdata(int index
) { return lua_touserdata(lua_handle
, index
); }
483 const void* topointer(int index
) { return lua_topointer(lua_handle
, index
); }
484 int gettop() { return lua_gettop(lua_handle
); }
485 void pushvalue(int index
) { lua_pushvalue(lua_handle
, index
); }
486 void pushlightuserdata(void* p
) { lua_pushlightuserdata(lua_handle
, p
); }
487 void rawset(int index
) { lua_rawset(lua_handle
, index
); }
488 void pushnil() { lua_pushnil(lua_handle
); }
489 void pushstring(const char* s
) { lua_pushstring(lua_handle
, s
); }
490 void rawget(int index
) { lua_rawget(lua_handle
, index
); }
491 int isnil(int index
) { return lua_isnil(lua_handle
, index
); }
492 void newtable() { lua_newtable(lua_handle
); }
493 void pushcclosure(lua_CFunction fn
, int n
) { lua_pushcclosure(lua_handle
, fn
, n
); }
494 void pushcfunction(lua_CFunction fn
) { lua_pushcfunction(lua_handle
, fn
); }
495 void setfield(int index
, const char* k
) { lua_setfield(lua_handle
, index
, k
); }
496 void getfield(int index
, const char* k
) { lua_getfield(lua_handle
, index
, k
); }
497 void getglobal(const char* name
) { lua_getglobal(lua_handle
, name
); }
498 void setglobal(const char* name
) { lua_setglobal(lua_handle
, name
); }
499 void insert(int index
) { lua_insert(lua_handle
, index
); }
500 void settable(int index
) { lua_settable(lua_handle
, index
); }
501 int isnone(int index
) { return lua_isnone(lua_handle
, index
); }
502 int isnumber(int index
) { return lua_isnumber(lua_handle
, index
); }
503 int isinteger(int index
) { return LUA_INTEGER_POSTFIX(lua_is
) (lua_handle
, index
); }
504 int isboolean(int index
) { return lua_isboolean(lua_handle
, index
); }
505 int toboolean(int index
) { return lua_toboolean(lua_handle
, index
); }
506 const char* tolstring(int index
, size_t *len
) { return lua_tolstring(lua_handle
, index
, len
); }
507 lua_Number
tonumber(int index
) { return lua_tonumber(lua_handle
, index
); }
508 uint64_t tointeger(int index
) { return LUA_INTEGER_POSTFIX(lua_to
) (lua_handle
, index
); }
509 void gettable(int index
) { lua_gettable(lua_handle
, index
); }
510 int load(lua_Reader reader
, void* data
, const char* chunkname
, const char* mode
) {
512 return lua_load(lua_handle
, reader
, data
, chunkname
LUA_LOADMODE_ARG(mode
) );
514 const char* tostring(int index
) { return lua_tostring(lua_handle
, index
); }
515 const char* tolstring(int index
, size_t& len
) { return lua_tolstring(lua_handle
, index
, &len
); }
516 void pushlstring(const char* s
, size_t len
) { lua_pushlstring(lua_handle
, s
, len
); }
517 void pushlstring(const std::string
& s
) { lua_pushlstring(lua_handle
, s
.c_str(), s
.length()); }
518 void pushlstring(const char32_t
* s
, size_t len
) { pushlstring(utf8::to8(std::u32string(s
, len
))); }
519 int pcall(int nargs
, int nresults
, int errfunc
)
521 state
* master_state
= this;
522 while(master_state
->master
) master_state
= master_state
->master
;
523 //Upon entry to protected mode, interruptable mode is always set, and it is restored on exit
524 //from protected mode.
525 bool old_interruptable
= master_state
->interruptable
;
526 master_state
->interruptable
= true;
527 auto ret
= lua_pcall(lua_handle
, nargs
, nresults
, errfunc
);
528 master_state
->interruptable
= old_interruptable
;
531 int next(int index
) { return lua_next(lua_handle
, index
); }
532 int isnoneornil(int index
) { return lua_isnoneornil(lua_handle
, index
); }
533 void rawgeti(int index
, int n
) { lua_rawgeti(lua_handle
, index
, n
); }
534 template<typename T
> void pushnumber(T val
)
536 if(std::numeric_limits
<T
>::is_integer
)
541 void pushboolean(bool b
) { lua_pushboolean(lua_handle
, b
); }
542 void pushglobals() { LUA_LOADGLOBALS
}
544 void _pushnumber(lua_Number n
) { return lua_pushnumber(lua_handle
, n
); }
545 void _pushinteger(uint64_t n
) { return LUA_INTEGER_POSTFIX(lua_push
) (lua_handle
, n
); }
546 static void builtin_oom();
547 static void builtin_soft_oom(int status
);
548 static void* builtin_alloc(void* user
, void* old
, size_t olds
, size_t news
);
549 void (*oom_handler
)();
550 void (*soft_oom_handler
)(int status
);
555 lua_State
* lua_handle
;
557 state
& operator=(state
&);