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/* tolua: event functions
** Support code for Lua bindings.
** Written by Waldemar Celes
** TeCGraf/PUC-Rio
** Apr 2003
** $Id: tolua_event.c,v 1.7 2011/01/13 13:43:46 fabraham Exp $
*/
/* This code is free software; you can redistribute it and/or modify it.
** The software provided hereunder is on an "as is" basis, and
** the author has no obligation to provide maintenance, support, updates,
** enhancements, or modifications.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "tolua.h"
/* Store at peer
* It stores, creating the corresponding table if needed,
* the pair key/value in the corresponding peer table
*/
static void storeatpeer (lua_State* L, int index)
{
/* stack: key value (to be stored) */
lua_pushstring(L,"tolua_peer");
lua_rawget(L,LUA_REGISTRYINDEX); /* stack: k v peer */
lua_pushvalue(L, index);
lua_rawget(L,-2); /* stack: k v peer peer[u] */
if (!lua_istable(L,-1))
{
lua_pop(L,1); /* stack: k v peer */
lua_newtable(L); /* stack: k v peer table */
lua_pushvalue(L,index);
lua_pushvalue(L,-2); /* stack: k v peer table u table */
lua_rawset(L,-4); /* stack: k v peer peer[u]=table */
}
lua_insert(L,-4); /* put table before k */
lua_pop(L,1); /* pop peer */
lua_rawset(L,-3); /* store at table */
lua_pop(L,1); /* pop peer[u] */
}
/* Module index function
*/
static int module_index_event (lua_State* L)
{
lua_pushstring(L,".get");
lua_rawget(L,-3);
if (lua_istable(L,-1))
{
lua_pushvalue(L,2); /* key */
lua_rawget(L,-2);
if (lua_iscfunction(L,-1))
{
lua_call(L,0,1);
return 1;
}
else if (lua_istable(L,-1))
return 1;
}
/* call old index meta event */
if (lua_getmetatable(L,1))
{
lua_pushstring(L,"__index");
lua_rawget(L,-2);
lua_pushvalue(L,1);
lua_pushvalue(L,2);
if (lua_isfunction(L,-1))
{
lua_call(L,2,1);
return 1;
}
else if (lua_istable(L,-1))
{
lua_gettable(L,-3);
return 1;
}
}
lua_pushnil(L);
return 1;
}
/* Module newindex function
*/
static int module_newindex_event (lua_State* L)
{
lua_pushstring(L,".set");
lua_rawget(L,-4);
if (lua_istable(L,-1))
{
lua_pushvalue(L,2); /* key */
lua_rawget(L,-2);
if (lua_iscfunction(L,-1))
{
lua_pushvalue(L,1); /* only to be compatible with non-static vars */
lua_pushvalue(L,3); /* value */
lua_call(L,2,0);
return 0;
}
}
/* call old newindex meta event */
if (lua_getmetatable(L,1) && lua_getmetatable(L,-1))
{
lua_pushstring(L,"__newindex");
lua_rawget(L,-2);
if (lua_isfunction(L,-1))
{
lua_pushvalue(L,1);
lua_pushvalue(L,2);
lua_pushvalue(L,3);
lua_call(L,3,0);
}
}
lua_settop(L,3);
lua_rawset(L,-3);
return 0;
}
/* Class index function
* If the object is a userdata (ie, an object), it searches the field in
* the alternative table stored in the corresponding "peer" table.
*/
static int class_index_event (lua_State* L)
{
int t = lua_type(L,1);
if (t == LUA_TUSERDATA)
{
/* Access alternative table */
lua_pushstring(L,"tolua_peer");
lua_rawget(L,LUA_REGISTRYINDEX); /* stack: obj key peer */
lua_pushvalue(L,1);
lua_rawget(L,-2); /* stack: obj key peer peer[u] */
if (lua_istable(L,-1))
{
lua_pushvalue(L,2); /* key */
lua_rawget(L,-2); /* stack: obj key peer peer[u] value */
if (!lua_isnil(L,-1))
return 1;
}
lua_settop(L,2); /* stack: obj key */
/* Try metatables */
lua_pushvalue(L,1); /* stack: obj key obj */
while (lua_getmetatable(L,-1))
{ /* stack: obj key obj mt */
lua_remove(L,-2); /* stack: obj key mt */
if (lua_isnumber(L,2)) /* check if key is a numeric value */
{
/* try operator[] */
lua_pushstring(L,".geti");
lua_rawget(L,-2); /* stack: obj key mt func */
if (lua_isfunction(L,-1))
{
lua_pushvalue(L,1);
lua_pushvalue(L,2);
lua_call(L,2,1);
return 1;
}
}
else
{
lua_pushvalue(L,2); /* stack: obj key mt key */
lua_rawget(L,-2); /* stack: obj key mt value */
if (!lua_isnil(L,-1))
return 1;
else
lua_pop(L,1);
/* try C/C++ variable */
lua_pushstring(L,".get");
lua_rawget(L,-2); /* stack: obj key mt tget */
if (lua_istable(L,-1))
{
lua_pushvalue(L,2);
lua_rawget(L,-2); /* stack: obj key mt value */
if (lua_iscfunction(L,-1))
{
lua_pushvalue(L,1);
lua_pushvalue(L,2);
lua_call(L,2,1);
return 1;
}
else if (lua_istable(L,-1))
{
/* deal with array: create table to be returned and cache it in peer */
void* u = *((void**)lua_touserdata(L,1));
lua_newtable(L); /* stack: obj key mt value table */
lua_pushstring(L,".self");
lua_pushlightuserdata(L,u);
lua_rawset(L,-3); /* store usertype in ".self" */
lua_insert(L,-2); /* stack: obj key mt table value */
lua_setmetatable(L,-2); /* set stored value as metatable */
lua_pushvalue(L,-1); /* stack: obj key met table table */
lua_pushvalue(L,2); /* stack: obj key mt table table key */
lua_insert(L,-2); /* stack: obj key mt table key table */
storeatpeer(L,1); /* stack: obj key mt table */
return 1;
}
}
}
lua_settop(L,3);
}
lua_pushnil(L);
return 1;
}
else if (t== LUA_TTABLE)
{
module_index_event(L);
return 1;
}
lua_pushnil(L);
return 1;
}
/* Newindex function
* It first searches for a C/C++ varaible to be set.
* Then, it either stores it in the alternative peer table (in the case it is
* an object) or in the own table (that represents the class or module).
*/
static int class_newindex_event (lua_State* L)
{
int t = lua_type(L,1);
if (t == LUA_TUSERDATA)
{
/* Try accessing a C/C++ variable to be set */
lua_getmetatable(L,1);
while (lua_istable(L,-1)) /* stack: t k v mt */
{
if (lua_isnumber(L,2)) /* check if key is a numeric value */
{
/* try operator[] */
lua_pushstring(L,".seti");
lua_rawget(L,-2); /* stack: obj key mt func */
if (lua_isfunction(L,-1))
{
lua_pushvalue(L,1);
lua_pushvalue(L,2);
lua_pushvalue(L,3);
lua_call(L,3,0);
return 0;
}
}
else
{
lua_pushstring(L,".set");
lua_rawget(L,-2); /* stack: t k v mt tset */
if (lua_istable(L,-1))
{
lua_pushvalue(L,2);
lua_rawget(L,-2); /* stack: t k v mt tset func */
if (lua_iscfunction(L,-1))
{
lua_pushvalue(L,1);
lua_pushvalue(L,3);
lua_call(L,2,0);
return 0;
}
lua_pop(L,1); /* stack: t k v mt tset */
}
lua_pop(L,1); /* stack: t k v mt */
if (!lua_getmetatable(L,-1)) /* stack: t k v mt mt */
lua_pushnil(L);
lua_remove(L,-2); /* stack: t k v mt */
}
}
lua_settop(L,3); /* stack: t k v */
/* then, store as a new field */
storeatpeer(L,1);
}
else if (t== LUA_TTABLE)
{
module_newindex_event(L);
}
return 0;
}
static int do_operator (lua_State* L, const char* op)
{
if (lua_isuserdata(L,1))
{
/* Try metatables */
lua_pushvalue(L,1); /* stack: op1 op2 */
while (lua_getmetatable(L,-1))
{ /* stack: op1 op2 op1 mt */
lua_remove(L,-2); /* stack: op1 op2 mt */
lua_pushstring(L,op); /* stack: op1 op2 mt key */
lua_rawget(L,-2); /* stack: obj key mt func */
if (lua_isfunction(L,-1))
{
lua_pushvalue(L,1);
lua_pushvalue(L,2);
lua_call(L,2,1);
return 1;
}
lua_settop(L,3);
}
}
if (strcmp(op,".eq")==0)
{
lua_pushboolean(L,lua_rawequal(L,1,2));
return 1;
}
else
{
tolua_error(L,"Attempt to perform operation on an invalid operand",NULL);
return 0;
}
}
static int class_add_event (lua_State* L)
{
return do_operator(L,".add");
}
static int class_sub_event (lua_State* L)
{
return do_operator(L,".sub");
}
static int class_mul_event (lua_State* L)
{
return do_operator(L,".mul");
}
static int class_div_event (lua_State* L)
{
return do_operator(L,".div");
}
static int class_lt_event (lua_State* L)
{
return do_operator(L,".lt");
}
static int class_le_event (lua_State* L)
{
return do_operator(L,".le");
}
static int class_eq_event (lua_State* L)
{
return do_operator(L,".eq");
}
static int class_gc_event (lua_State* L)
{
if (lua_type(L,1) == LUA_TUSERDATA)
{
int top = lua_gettop(L);
void* u = *((void**)lua_touserdata(L,1));
lua_pushstring(L,"tolua_gc");
lua_rawget(L,LUA_REGISTRYINDEX); /* gc */
lua_pushlightuserdata(L,u); /* gc u */
lua_rawget(L,-2); /* gc func */
if (!lua_isnil(L, -1))
{
/* remove entry from table */
lua_pushlightuserdata(L,u);
lua_pushnil(L);
lua_rawset(L,-4);
if (lua_isfunction(L,-1)) {
/* call collect function */
lua_pushvalue(L,1); /* tolua_gc tolua_gc.u(func) u */
lua_call(L,1,0); /* tolua_gc */
}
else if (lua_isuserdata(L,-1) && *((void**)lua_touserdata(L,-1))==NULL) {
/* free object */
free(u);
tolua_release(L,u); /* unmap from tolua tables */
}
}
lua_settop(L,top);
}
return 0;
}
/* Register module events
* It expects the metatable on the top of the stack
*/
TOLUA_API void tolua_moduleevents (lua_State* L)
{
lua_pushstring(L,"__index");
lua_pushcfunction(L,module_index_event);
lua_rawset(L,-3);
lua_pushstring(L,"__newindex");
lua_pushcfunction(L,module_newindex_event);
lua_rawset(L,-3);
}
/* Check if the object on the top has a module metatable
*/
TOLUA_API int tolua_ismodulemetatable (lua_State* L)
{
int r = 0;
if (lua_getmetatable(L,-1))
{
lua_pushstring(L,"__index");
lua_rawget(L,-2);
r = (lua_tocfunction(L,-1) == module_index_event);
lua_pop(L,2);
}
return r;
}
/* Register class events
* It expects the metatable on the top of the stack
*/
TOLUA_API void tolua_classevents (lua_State* L)
{
lua_pushstring(L,"__index");
lua_pushcfunction(L,class_index_event);
lua_rawset(L,-3);
lua_pushstring(L,"__newindex");
lua_pushcfunction(L,class_newindex_event);
lua_rawset(L,-3);
lua_pushstring(L,"__add");
lua_pushcfunction(L,class_add_event);
lua_rawset(L,-3);
lua_pushstring(L,"__sub");
lua_pushcfunction(L,class_sub_event);
lua_rawset(L,-3);
lua_pushstring(L,"__mul");
lua_pushcfunction(L,class_mul_event);
lua_rawset(L,-3);
lua_pushstring(L,"__div");
lua_pushcfunction(L,class_div_event);
lua_rawset(L,-3);
lua_pushstring(L,"__lt");
lua_pushcfunction(L,class_lt_event);
lua_rawset(L,-3);
lua_pushstring(L,"__le");
lua_pushcfunction(L,class_le_event);
lua_rawset(L,-3);
lua_pushstring(L,"__eq");
lua_pushcfunction(L,class_eq_event);
lua_rawset(L,-3);
lua_pushstring(L,"__gc");
lua_pushcfunction(L,class_gc_event);
lua_rawset(L,-3);
}
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