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/* lua-utils.c
*
* Copyright (C) 2009 Francesco Abbate
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <lua.h>
#include <lauxlib.h>
#include <string.h>
#include <stdio.h>
#include "lua-utils.h"
#include "gs-types.h"
static char const * const CACHE_FIELD_NAME = "__cache";
const struct luaL_Reg *
mlua_find_method (const struct luaL_Reg *p, const char *key)
{
for (/* */; p->name; p++)
{
if (strcmp (p->name, key) == 0)
return p;
}
return NULL;
}
int
mlua_get_property (lua_State *L, const struct luaL_Reg *p, bool use_cache)
{
int rval;
bool cache_is_new = false;
if (! use_cache)
return p->func (L);
lua_getfenv (L, 1);
lua_getfield (L, -1, CACHE_FIELD_NAME);
if (lua_isnil (L, -1))
{
lua_pop (L, 1);
lua_newtable (L);
lua_pushvalue (L, -1);
lua_setfield (L, -3, CACHE_FIELD_NAME);
cache_is_new = true;
}
if (! cache_is_new)
{
lua_getfield (L, -1, p->name);
if (! lua_isnil (L, -1))
return 1;
lua_pop (L, 1);
}
rval = p->func (L);
if (rval == 1)
{
lua_pushvalue (L, -1);
lua_setfield (L, -3, p->name);
return 1;
}
return rval;
}
int
mlua_index_with_properties (lua_State *L,
const struct luaL_Reg *properties,
const struct luaL_Reg *methods,
bool use_cache)
{
char const * key;
const struct luaL_Reg *reg;
key = lua_tostring (L, 2);
if (key == NULL)
return 0;
reg = mlua_find_method (methods, key);
if (reg)
{
lua_pushcfunction (L, reg->func);
return 1;
}
reg = mlua_find_method (properties, key);
if (reg)
{
return mlua_get_property (L, reg, use_cache);
}
return 0;
}
int
mlua_newindex_with_properties (lua_State *L, const struct luaL_Reg *properties)
{
char const * key;
const struct luaL_Reg *reg;
key = lua_tostring (L, 2);
if (key == NULL)
return 0;
reg = mlua_find_method (properties, key);
if (reg)
{
lua_remove (L, 2);
return reg->func (L);
}
return luaL_error (L, "invalid property for %s object", full_type_name (L, 1));
}
lua_Number
mlua_named_optnumber (lua_State *L, int index, const char *key,
lua_Number default_value)
{
lua_Number r;
lua_getfield (L, index, key);
r = luaL_optnumber (L, -1, default_value);
lua_pop (L, 1);
return r;
}
const char *
mlua_named_optstring (lua_State *L, int index, const char *key,
const char * default_value)
{
const char * r;
lua_getfield (L, index, key);
r = luaL_optstring (L, -1, default_value);
lua_pop (L, 1);
return r;
}
lua_Number
mlua_named_number (lua_State *L, int index, const char *key)
{
lua_Number r;
lua_getfield (L, index, key);
if (! lua_isnumber (L, -1))
luaL_error (L, "number expected");
r = lua_tonumber (L, -1);
lua_pop (L, 1);
return r;
}
const char *
mlua_named_string (lua_State *L, int index, const char *key)
{
const char * r;
lua_getfield (L, index, key);
if (! lua_isstring (L, -1))
luaL_error (L, "string expected");
r = lua_tostring (L, -1);
lua_pop (L, 1);
return r;
}
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