Permalink
Switch branches/tags
Nothing to show
Find file
Fetching contributors…
Cannot retrieve contributors at this time
98 lines (91 sloc) 3.01 KB
/*
** Compat-5.1
** Copyright Kepler Project 2004-2006 (http://www.keplerproject.org/compat)
** $Id: compat-5.1.c,v 1.13 2006/02/20 21:12:47 carregal Exp $
*/
#include <stdio.h>
#include <string.h>
#include "lua.h"
#include "lauxlib.h"
#include "compat-5.1.h"
static void getfield(lua_State *L, int idx, const char *name) {
const char *end = strchr(name, '.');
lua_pushvalue(L, idx);
while (end) {
lua_pushlstring(L, name, end - name);
lua_gettable(L, -2);
lua_remove(L, -2);
if (lua_isnil(L, -1)) return;
name = end+1;
end = strchr(name, '.');
}
lua_pushstring(L, name);
lua_gettable(L, -2);
lua_remove(L, -2);
}
static void setfield(lua_State *L, int idx, const char *name) {
const char *end = strchr(name, '.');
lua_pushvalue(L, idx);
while (end) {
lua_pushlstring(L, name, end - name);
lua_gettable(L, -2);
/* create table if not found */
if (lua_isnil(L, -1)) {
lua_pop(L, 1);
lua_newtable(L);
lua_pushlstring(L, name, end - name);
lua_pushvalue(L, -2);
lua_settable(L, -4);
}
lua_remove(L, -2);
name = end+1;
end = strchr(name, '.');
}
lua_pushstring(L, name);
lua_pushvalue(L, -3);
lua_settable(L, -3);
lua_pop(L, 2);
}
LUALIB_API void luaL_module(lua_State *L, const char *libname,
const luaL_reg *l, int nup) {
if (libname) {
getfield(L, LUA_GLOBALSINDEX, libname); /* check whether lib already exists */
if (lua_isnil(L, -1)) {
int env, ns;
lua_pop(L, 1); /* get rid of nil */
lua_pushliteral(L, "require");
lua_gettable(L, LUA_GLOBALSINDEX); /* look for require */
lua_getfenv(L, -1); /* getfenv(require) */
lua_remove(L, -2); /* remove function require */
env = lua_gettop(L);
lua_newtable(L); /* create namespace for lib */
ns = lua_gettop(L);
getfield(L, env, "package.loaded"); /* get package.loaded table */
if (lua_isnil(L, -1)) { /* create package.loaded table */
lua_pop(L, 1); /* remove previous result */
lua_newtable(L);
lua_pushvalue(L, -1);
setfield(L, env, "package.loaded");
}
else if (!lua_istable(L, -1))
luaL_error(L, "name conflict for library `%s'", libname);
lua_pushstring(L, libname);
lua_pushvalue(L, ns);
lua_settable(L, -3); /* package.loaded[libname] = ns */
lua_pop(L, 1); /* get rid of package.loaded table */
lua_pushvalue(L, ns); /* copy namespace */
setfield(L, LUA_GLOBALSINDEX, libname);
lua_remove (L, env); /* remove env */
}
lua_insert(L, -(nup+1)); /* move library table to below upvalues */
}
for (; l->name; l++) {
int i;
lua_pushstring(L, l->name);
for (i=0; i<nup; i++) /* copy upvalues to the top */
lua_pushvalue(L, -(nup+1));
lua_pushcclosure(L, l->func, nup);
lua_settable(L, -(nup+3));
}
lua_pop(L, nup); /* remove upvalues */
}