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/* tolua: event functions
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** Support code for Lua bindings.
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** Written by Waldemar Celes
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** $Id: tolua_event.c 10334 2005-04-26 22:08:24Z vas $
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/* This code is free software; you can redistribute it and/or modify it.
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** The software provided hereunder is on an "as is" basis, and
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** the author has no obligation to provide maintenance, support, updates,
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** enhancements, or modifications.
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#include "tolua_event.h"
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* It stores, creating the corresponding table if needed,
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* the pair key/value in the corresponding peer table
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static void storeatpeer (lua_State* L, int u)
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/* stack: key value (to be stored) */
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lua_pushstring(L,"tolua_peer");
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lua_rawget(L,LUA_REGISTRYINDEX); /* stack: k v peer */
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lua_rawget(L,-2); /* stack: k v peer peer[u] */
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if (!lua_istable(L,-1))
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lua_pop(L,1); /* stack: k v peer */
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lua_newtable(L); /* stack: k v peer table */
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lua_pushvalue(L,-2); /* stack: k v peer table u table */
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lua_rawset(L,-4); /* stack: k v peer peer[u]=table */
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lua_insert(L,-4); /* put table before k */
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lua_pop(L,1); /* pop peer */
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lua_rawset(L,-3); /* store at table */
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lua_pop(L,1); /* pop peer[u] */
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/* Module index function
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static int module_index_event (lua_State* L)
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lua_pushstring(L,".get");
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if (lua_istable(L,-1))
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lua_pushvalue(L,2); /* key */
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if (lua_iscfunction(L,-1))
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else if (lua_istable(L,-1))
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/* call old index meta event */
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if (lua_getmetatable(L,1))
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lua_pushstring(L,"__index");
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if (lua_isfunction(L,-1))
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else if (lua_istable(L,-1))
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/* Module newindex function
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static int module_newindex_event (lua_State* L)
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lua_pushstring(L,".set");
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if (lua_istable(L,-1))
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lua_pushvalue(L,2); /* key */
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if (lua_iscfunction(L,-1))
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lua_pushvalue(L,1); /* only to be compatible with non-static vars */
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lua_pushvalue(L,3); /* value */
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/* call old newindex meta event */
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if (lua_getmetatable(L,1) && lua_getmetatable(L,-1))
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lua_pushstring(L,"__newindex");
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if (lua_isfunction(L,-1))
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/* Class index function
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* If the object is a userdata (ie, an object), it searches the field in
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* the alternative table stored in the corresponding "peer" table.
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static int class_index_event (lua_State* L)
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int t = lua_type(L,1);
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if (t == LUA_TUSERDATA)
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/* Access alternative table */
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lua_pushstring(L,"tolua_peer");
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lua_rawget(L,LUA_REGISTRYINDEX); /* stack: obj key peer */
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lua_rawget(L,-2); /* stack: obj key peer peer[u] */
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if (lua_istable(L,-1))
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lua_pushvalue(L,2); /* key */
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lua_rawget(L,-2); /* stack: obj key peer peer[u] value */
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if (!lua_isnil(L,-1))
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lua_settop(L,2); /* stack: obj key */
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lua_pushvalue(L,1); /* stack: obj key obj */
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while (lua_getmetatable(L,-1))
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{ /* stack: obj key obj mt */
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lua_remove(L,-2); /* stack: obj key mt */
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if (lua_isnumber(L,2)) /* check if key is a numeric value */
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lua_pushstring(L,".geti");
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lua_rawget(L,-2); /* stack: obj key mt func */
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if (lua_isfunction(L,-1))
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lua_pushvalue(L,2); /* stack: obj key mt key */
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lua_rawget(L,-2); /* stack: obj key mt value */
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if (!lua_isnil(L,-1))
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/* try C/C++ variable */
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lua_pushstring(L,".get");
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lua_rawget(L,-2); /* stack: obj key mt tget */
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if (lua_istable(L,-1))
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lua_rawget(L,-2); /* stack: obj key mt value */
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if (lua_iscfunction(L,-1))
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else if (lua_istable(L,-1))
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/* deal with array: create table to be returned and cache it in peer */
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void* u = *((void**)lua_touserdata(L,1));
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lua_newtable(L); /* stack: obj key mt value table */
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lua_pushstring(L,".self");
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lua_pushlightuserdata(L,u);
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lua_rawset(L,-3); /* store usertype in ".self" */
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lua_insert(L,-2); /* stack: obj key mt table value */
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lua_setmetatable(L,-2); /* set stored value as metatable */
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lua_pushvalue(L,-1); /* stack: obj key met table table */
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lua_pushvalue(L,2); /* stack: obj key mt table table key */
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lua_insert(L,-2); /* stack: obj key mt table key table */
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storeatpeer(L,1); /* stack: obj key mt table */
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else if (t== LUA_TTABLE)
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module_index_event(L);
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* It first searches for a C/C++ varaible to be set.
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* Then, it either stores it in the alternative peer table (in the case it is
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* an object) or in the own table (that represents the class or module).
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static int class_newindex_event (lua_State* L)
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int t = lua_type(L,1);
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if (t == LUA_TUSERDATA)
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/* Try accessing a C/C++ variable to be set */
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lua_getmetatable(L,1);
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while (lua_istable(L,-1)) /* stack: t k v mt */
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if (lua_isnumber(L,2)) /* check if key is a numeric value */
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lua_pushstring(L,".seti");
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lua_rawget(L,-2); /* stack: obj key mt func */
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if (lua_isfunction(L,-1))
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lua_pushstring(L,".set");
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lua_rawget(L,-2); /* stack: t k v mt tset */
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if (lua_istable(L,-1))
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lua_rawget(L,-2); /* stack: t k v mt tset func */
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if (lua_iscfunction(L,-1))
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lua_pop(L,1); /* stack: t k v mt tset */
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lua_pop(L,1); /* stack: t k v mt */
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if (!lua_getmetatable(L,-1)) /* stack: t k v mt mt */
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lua_remove(L,-2); /* stack: t k v mt */
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lua_settop(L,3); /* stack: t k v */
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/* then, store as a new field */
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else if (t== LUA_TTABLE)
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module_newindex_event(L);
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static int do_operator (lua_State* L, const char* op)
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if (lua_isuserdata(L,1))
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lua_pushvalue(L,1); /* stack: op1 op2 */
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while (lua_getmetatable(L,-1))
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{ /* stack: op1 op2 op1 mt */
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lua_remove(L,-2); /* stack: op1 op2 mt */
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lua_pushstring(L,op); /* stack: op1 op2 mt key */
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lua_rawget(L,-2); /* stack: obj key mt func */
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if (lua_isfunction(L,-1))
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tolua_error(L,"Attempt to perform operation on an invalid operand",NULL);
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static int class_add_event (lua_State* L)
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return do_operator(L,".add");
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static int class_sub_event (lua_State* L)
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return do_operator(L,".sub");
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static int class_mul_event (lua_State* L)
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return do_operator(L,".mul");
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static int class_div_event (lua_State* L)
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return do_operator(L,".div");
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static int class_lt_event (lua_State* L)
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return do_operator(L,".lt");
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static int class_le_event (lua_State* L)
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return do_operator(L,".le");
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static int class_eq_event (lua_State* L)
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return do_operator(L,".eq");
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static int class_gc_event (lua_State* L)
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void* u = *((void**)lua_touserdata(L,1));
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lua_pushstring(L,"tolua_gc");
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lua_rawget(L,LUA_REGISTRYINDEX);
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lua_pushlightuserdata(L,u);
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if (lua_isfunction(L,-1))
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lua_pushlightuserdata(L,u);
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/* Register module events
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* It expects the metatable on the top of the stack
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TOLUA_API void tolua_moduleevents (lua_State* L)
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lua_pushstring(L,"__index");
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lua_pushcfunction(L,module_index_event);
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lua_pushstring(L,"__newindex");
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lua_pushcfunction(L,module_newindex_event);
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/* Check if the object on the top has a module metatable
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TOLUA_API int tolua_ismodulemetatable (lua_State* L)
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if (lua_getmetatable(L,-1))
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lua_pushstring(L,"__index");
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r = (lua_tocfunction(L,-1) == module_index_event);
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/* Register class events
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* It expects the metatable on the top of the stack
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TOLUA_API void tolua_classevents (lua_State* L)
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lua_pushstring(L,"__index");
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lua_pushcfunction(L,class_index_event);
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lua_pushstring(L,"__newindex");
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lua_pushcfunction(L,class_newindex_event);
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lua_pushstring(L,"__add");
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lua_pushcfunction(L,class_add_event);
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lua_pushstring(L,"__sub");
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lua_pushcfunction(L,class_sub_event);
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lua_pushstring(L,"__mul");
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lua_pushcfunction(L,class_mul_event);
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lua_pushstring(L,"__div");
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lua_pushcfunction(L,class_div_event);
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lua_pushstring(L,"__lt");
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lua_pushcfunction(L,class_lt_event);
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lua_pushstring(L,"__le");
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lua_pushcfunction(L,class_le_event);
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lua_pushstring(L,"__eq");
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lua_pushcfunction(L,class_eq_event);
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lua_pushstring(L,"__gc");
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lua_pushcfunction(L,class_gc_event);
added
removed
dependencies/tolua/tolua_event.c
