forked from minetest-mods/irc
98 lines
3.1 KiB
C
98 lines
3.1 KiB
C
/*
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** Compat-5.1
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** Copyright Kepler Project 2004-2005 (http://www.keplerproject.org/compat)
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** $Id: compat-5.1.c,v 1.12 2005/07/08 18:25:52 carregal Exp $
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*/
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#include <stdio.h>
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#include <string.h>
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#include "lua.h"
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#include "lauxlib.h"
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#include "compat51.h"
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static void getfield(lua_State *L, int idx, const char *name) {
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const char *end = strchr(name, '.');
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lua_pushvalue(L, idx);
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while (end) {
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lua_pushlstring(L, name, end - name);
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lua_gettable(L, -2);
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lua_remove(L, -2);
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if (lua_isnil(L, -1)) return;
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name = end+1;
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end = strchr(name, '.');
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}
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lua_pushstring(L, name);
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lua_gettable(L, -2);
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lua_remove(L, -2);
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}
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static void setfield(lua_State *L, int idx, const char *name) {
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const char *end = strchr(name, '.');
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lua_pushvalue(L, idx);
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while (end) {
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lua_pushlstring(L, name, end - name);
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lua_gettable(L, -2);
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/* create table if not found */
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if (lua_isnil(L, -1)) {
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lua_pop(L, 1);
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lua_newtable(L);
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lua_pushlstring(L, name, end - name);
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lua_pushvalue(L, -2);
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lua_settable(L, -4);
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}
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lua_remove(L, -2);
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name = end+1;
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end = strchr(name, '.');
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}
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lua_pushstring(L, name);
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lua_pushvalue(L, -3);
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lua_settable(L, -3);
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lua_pop(L, 2);
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}
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LUALIB_API void luaL_module(lua_State *L, const char *libname,
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const luaL_reg *l, int nup) {
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if (libname) {
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getfield(L, LUA_GLOBALSINDEX, libname); /* check whether lib already exists */
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if (lua_isnil(L, -1)) {
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int env, ns;
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lua_pop(L, 1); /* get rid of nil */
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lua_pushliteral(L, "require");
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lua_gettable(L, LUA_GLOBALSINDEX); /* look for require */
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lua_getfenv(L, -1); /* getfenv(require) */
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lua_remove(L, -2); /* remove function require */
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env = lua_gettop(L);
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lua_newtable(L); /* create namespace for lib */
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ns = lua_gettop(L);
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getfield(L, env, "package.loaded"); /* get package.loaded table */
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if (lua_isnil(L, -1)) { /* create package.loaded table */
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lua_pop(L, 1); /* remove previous result */
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lua_newtable(L);
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lua_pushvalue(L, -1);
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setfield(L, env, "package.loaded");
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}
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else if (!lua_istable(L, -1))
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luaL_error(L, "name conflict for library `%s'", libname);
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lua_pushstring(L, libname);
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lua_pushvalue(L, ns);
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lua_settable(L, -3); /* package.loaded[libname] = ns */
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lua_pop(L, 1); /* get rid of package.loaded table */
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lua_pushvalue(L, ns); /* copy namespace */
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setfield(L, LUA_GLOBALSINDEX, libname);
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lua_remove (L, env); /* remove env */
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}
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lua_insert(L, -(nup+1)); /* move library table to below upvalues */
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}
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for (; l->name; l++) {
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int i;
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lua_pushstring(L, l->name);
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for (i=0; i<nup; i++) /* copy upvalues to the top */
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lua_pushvalue(L, -(nup+1));
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lua_pushcclosure(L, l->func, nup);
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lua_settable(L, -(nup+3));
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}
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lua_pop(L, nup); /* remove upvalues */
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}
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