/* tolua: funcitons to convert to C types ** Support code for Lua bindings. ** Written by Waldemar Celes ** TeCGraf/PUC-Rio ** Apr 2003 ** $Id: $ */ /* 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 "tolua++.h" #include <string.h> #include <stdlib.h> TOLUA_API lua_Number tolua_tonumber (lua_State* L, int narg, lua_Number def) { return lua_gettop(L)<abs(narg) ? def : lua_tonumber(L,narg); } TOLUA_API const char* tolua_tostring (lua_State* L, int narg, const char* def) { return lua_gettop(L)<abs(narg) ? def : lua_tostring(L,narg); } TOLUA_API void* tolua_touserdata (lua_State* L, int narg, void* def) { /* return lua_gettop(L)<abs(narg) ? def : lua_touserdata(L,narg); */ if (lua_gettop(L)<abs(narg)) { return def; }; if (lua_islightuserdata(L, narg)) { return lua_touserdata(L,narg); }; return tolua_tousertype(L, narg, def); } extern int push_table_instance(lua_State* L, int lo); TOLUA_API void* tolua_tousertype (lua_State* L, int narg, void* def) { if (lua_gettop(L)<abs(narg)) return def; else { void* u; if (!lua_isuserdata(L, narg)) { if (!push_table_instance(L, narg)) return NULL; }; u = lua_touserdata(L,narg); return (u==NULL) ? NULL : *((void**)u); /* nil represents NULL */ } } TOLUA_API int tolua_tovalue (lua_State* L, int narg, int def) { return lua_gettop(L)<abs(narg) ? def : narg; } TOLUA_API int tolua_toboolean (lua_State* L, int narg, int def) { return lua_gettop(L)<abs(narg) ? def : lua_toboolean(L,narg); } TOLUA_API lua_Number tolua_tofieldnumber (lua_State* L, int lo, int index, lua_Number def) { double v; lua_pushnumber(L,index); lua_gettable(L,lo); v = lua_isnil(L,-1) ? def : lua_tonumber(L,-1); lua_pop(L,1); return v; } TOLUA_API const char* tolua_tofieldstring (lua_State* L, int lo, int index, const char* def) { const char* v; lua_pushnumber(L,index); lua_gettable(L,lo); v = lua_isnil(L,-1) ? def : lua_tostring(L,-1); lua_pop(L,1); return v; } TOLUA_API void* tolua_tofielduserdata (lua_State* L, int lo, int index, void* def) { void* v; lua_pushnumber(L,index); lua_gettable(L,lo); v = lua_isnil(L,-1) ? def : lua_touserdata(L,-1); lua_pop(L,1); return v; } TOLUA_API void* tolua_tofieldusertype (lua_State* L, int lo, int index, void* def) { void* v; lua_pushnumber(L,index); lua_gettable(L,lo); v = lua_isnil(L,-1) ? def : (*(void **)(lua_touserdata(L, -1))); /* lua_unboxpointer(L,-1); */ lua_pop(L,1); return v; } TOLUA_API int tolua_tofieldvalue (lua_State* L, int lo, int index, int def) { int v; lua_pushnumber(L,index); lua_gettable(L,lo); v = lua_isnil(L,-1) ? def : lo; lua_pop(L,1); return v; } TOLUA_API int tolua_getfieldboolean (lua_State* L, int lo, int index, int def) { int v; lua_pushnumber(L,index); lua_gettable(L,lo); v = lua_isnil(L,-1) ? 0 : lua_toboolean(L,-1); lua_pop(L,1); return v; }