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/*=========================================================================*\
* Auxiliar routines for class hierarchy manipulation
* LuaSocket toolkit
*
* RCS ID: $Id: auxiliar.c,v 1.4 2003/06/30 06:10:02 diego Exp $
\*=========================================================================*/
#include <string.h>
#include "luasocket.h"
#include "auxiliar.h"
/*=========================================================================*\
* Exported functions
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Initializes the module
\*-------------------------------------------------------------------------*/
void aux_open(lua_State *L)
{
/* create namespace table */
lua_pushstring(L, LUASOCKET_LIBNAME);
lua_newtable(L);
#ifdef LUASOCKET_DEBUG
lua_pushstring(L, "debug");
lua_pushnumber(L, 1);
lua_rawset(L, -3);
#endif
/* make version string available so scripts */
lua_pushstring(L, "version");
lua_pushstring(L, LUASOCKET_VERSION);
lua_rawset(L, -3);
/* store namespace as global */
lua_settable(L, LUA_GLOBALSINDEX);
/* make sure modules know what is our namespace */
lua_pushstring(L, "LUASOCKET_LIBNAME");
lua_pushstring(L, LUASOCKET_LIBNAME);
lua_settable(L, LUA_GLOBALSINDEX);
}
/*-------------------------------------------------------------------------*\
* Creates a new class with given methods
\*-------------------------------------------------------------------------*/
void aux_newclass(lua_State *L, const char *classname, luaL_reg *func)
{
luaL_newmetatable(L, classname); /* mt */
lua_pushstring(L, "__index"); /* mt,"__index" */
lua_newtable(L); /* mt,"__index",it */
luaL_openlib(L, NULL, func, 0);
#ifdef LUASOCKET_DEBUG
lua_pushstring(L, "class"); /* mt,"__index",it,"class" */
lua_pushstring(L, classname); /* mt,"__index",it,"class",classname */
lua_rawset(L, -3); /* mt,"__index",it */
#endif
/* get __gc method from class and use it for garbage collection */
lua_pushstring(L, "__gc"); /* mt,"__index",it,"__gc" */
lua_pushstring(L, "__gc"); /* mt,"__index",it,"__gc","__gc" */
lua_rawget(L, -3); /* mt,"__index",it,"__gc",fn */
lua_rawset(L, -5); /* mt,"__index",it */
lua_rawset(L, -3); /* mt */
lua_pop(L, 1);
}
/*-------------------------------------------------------------------------*\
* Insert class into group
\*-------------------------------------------------------------------------*/
void aux_add2group(lua_State *L, const char *classname, const char *groupname)
{
luaL_getmetatable(L, classname);
lua_pushstring(L, groupname);
lua_pushboolean(L, 1);
lua_rawset(L, -3);
lua_pop(L, 1);
}
/*-------------------------------------------------------------------------*\
* Make sure argument is a boolean
\*-------------------------------------------------------------------------*/
int aux_checkboolean(lua_State *L, int objidx)
{
if (!lua_isboolean(L, objidx))
luaL_typerror(L, objidx, lua_typename(L, LUA_TBOOLEAN));
return lua_toboolean(L, objidx);
}
/*-------------------------------------------------------------------------*\
* Calls appropriate option handler
\*-------------------------------------------------------------------------*/
int aux_meth_setoption(lua_State *L, luaL_reg *opt)
{
const char *name = luaL_checkstring(L, 2); /* obj, name, args */
while (opt->name && strcmp(name, opt->name))
opt++;
if (!opt->func) {
char msg[45];
sprintf(msg, "unknown option `%.35s'", name);
luaL_argerror(L, 2, msg);
}
lua_remove(L, 2); /* obj, args */
lua_pushcfunction(L, opt->func); /* obj, args, func */
lua_insert(L, 1); /* func, obj, args */
lua_call(L, lua_gettop(L)-1, LUA_MULTRET);
return lua_gettop(L);
}
/*-------------------------------------------------------------------------*\
* Return userdata pointer if object belongs to a given class, abort with
* error otherwise
\*-------------------------------------------------------------------------*/
void *aux_checkclass(lua_State *L, const char *classname, int objidx)
{
void *data = aux_getclassudata(L, classname, objidx);
if (!data) {
char msg[45];
sprintf(msg, "%.35s expected", classname);
luaL_argerror(L, objidx, msg);
}
return data;
}
/*-------------------------------------------------------------------------*\
* Return userdata pointer if object belongs to a given group, abort with
* error otherwise
\*-------------------------------------------------------------------------*/
void *aux_checkgroup(lua_State *L, const char *groupname, int objidx)
{
void *data = aux_getgroupudata(L, groupname, objidx);
if (!data) {
char msg[45];
sprintf(msg, "%.35s expected", groupname);
luaL_argerror(L, objidx, msg);
}
return data;
}
/*-------------------------------------------------------------------------*\
* Set object class
\*-------------------------------------------------------------------------*/
void aux_setclass(lua_State *L, const char *classname, int objidx)
{
luaL_getmetatable(L, classname);
if (objidx < 0) objidx--;
lua_setmetatable(L, objidx);
}
/*-------------------------------------------------------------------------*\
* Get a userdata pointer if object belongs to a given group. Return NULL
* otherwise
\*-------------------------------------------------------------------------*/
void *aux_getgroupudata(lua_State *L, const char *groupname, int objidx)
{
if (!lua_getmetatable(L, objidx))
return NULL;
lua_pushstring(L, groupname);
lua_rawget(L, -2);
if (lua_isnil(L, -1)) {
lua_pop(L, 2);
return NULL;
} else {
lua_pop(L, 2);
return lua_touserdata(L, objidx);
}
}
/*-------------------------------------------------------------------------*\
* Get a userdata pointer if object belongs to a given class. Return NULL
* otherwise
\*-------------------------------------------------------------------------*/
void *aux_getclassudata(lua_State *L, const char *classname, int objidx)
{
return luaL_checkudata(L, objidx, classname);
}
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