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create_class.cpp
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create_class.cpp
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// Copyright (c) 2003 Daniel Wallin and Arvid Norberg
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
// SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
// ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
// OR OTHER DEALINGS IN THE SOFTWARE.
#include "pch.h"
#include <luabind/lua_include.hpp>
#include <luabind/luabind.hpp>
namespace luabind { namespace detail
{
namespace
{
// expects two tables on the lua stack:
// 1: destination
// 2: source
void copy_member_table(lua_State* L)
{
lua_pushnil(L);
while (lua_next(L, -2))
{
lua_pushstring(L, "__init");
if (lua_equal(L, -1, -3))
{
lua_pop(L, 2);
continue;
}
else lua_pop(L, 1); // __init string
lua_pushstring(L, "__finalize");
if (lua_equal(L, -1, -3))
{
lua_pop(L, 2);
continue;
}
else lua_pop(L, 1); // __finalize string
lua_pushvalue(L, -2); // copy key
lua_insert(L, -2);
lua_settable(L, -5);
}
}
}
int create_class::stage2(lua_State* L)
{
class_rep* crep = static_cast<class_rep*>(lua_touserdata(L, lua_upvalueindex(1)));
assert((crep != 0) && "internal error, please report");
assert((is_class_rep(L, lua_upvalueindex(1))) && "internal error, please report");
#ifndef LUABIND_NO_ERROR_CHECKING
if (!is_class_rep(L, 1))
{
lua_pushstring(L, "expected class to derive from or a newline");
lua_error(L);
}
#endif
class_rep* base = static_cast<class_rep*>(lua_touserdata(L, 1));
class_rep::base_info binfo;
binfo.pointer_offset = 0;
binfo.base = base;
crep->add_base_class(binfo);
// set holder size and alignment so that we can class_rep::allocate
// can return the correctly sized buffers
crep->derived_from(base);
// copy base class members
crep->get_table(L);
base->get_table(L);
copy_member_table(L);
crep->get_default_table(L);
base->get_default_table(L);
copy_member_table(L);
crep->set_type(base->type());
return 0;
}
int create_class::stage1(lua_State* L)
{
#ifndef LUABIND_NO_ERROR_CHECKING
if (lua_gettop(L) != 1 || lua_type(L, 1) != LUA_TSTRING || lua_isnumber(L, 1))
{
lua_pushstring(L, "invalid construct, expected class name");
lua_error(L);
}
if (std::strlen(lua_tostring(L, 1)) != lua_strlen(L, 1))
{
lua_pushstring(L, "luabind does not support class names with extra nulls");
lua_error(L);
}
#endif
const char* name = lua_tostring(L, 1);
// int stack_level = lua_gettop(L);
//////////////////////////////////////////////////////////////////////////
// Here we are trying to add the class to the namespace in the local variable "this" if exist
//////////////////////////////////////////////////////////////////////////
int index = LUA_GLOBALSINDEX;
lua_Debug ar;
if ( lua_getstack (L, 1, &ar) )
{
int i = 1;
const char *name;
while ((name = lua_getlocal(L, &ar, i++)) != NULL) {
if (!strcmp("this",name)) {
if (lua_istable(L,-1))
index = lua_gettop(L);
else
lua_pop(L, 1);
break;
}
lua_pop(L, 1); /* remove variable value */
}
}
//////////////////////////////////////////////////////////////////////////
// End of change
//////////////////////////////////////////////////////////////////////////
void* c = lua_newuserdata(L, sizeof(class_rep));
new(c) class_rep(L, name);
// make the class globally available
lua_pushstring(L, name);
lua_pushvalue(L, -2);
lua_settable(L, index);
if (index != LUA_GLOBALSINDEX)
lua_remove(L,index);
// also add it to the closure as return value
lua_pushcclosure(L, &stage2, 1);
// int stack_level2 = lua_gettop(L);
return 1;
}
}}