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elimination of common code + better error message

This commit is contained in:
Roberto Ierusalimschy 2005-07-12 18:17:46 -03:00
parent a569099b70
commit a05190fa3b
1 changed files with 51 additions and 39 deletions
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90
loadlib.c
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@ -1,5 +1,5 @@
/*
** $Id: loadlib.c,v 1.31 2005/07/05 19:29:03 roberto Exp roberto $
** $Id: loadlib.c,v 1.32 2005/07/11 16:41:57 roberto Exp roberto $
** Dynamic library loader for Lua
** See Copyright Notice in lua.h
**
@ -329,48 +329,42 @@ static int ll_loadlib (lua_State *L) {
*/
static int loader_Lua (lua_State *L) {
static const char *findfile (lua_State *L, const char *pname) {
const char *name = luaL_checkstring(L, 1);
const char *fname = luaL_gsub(L, name, ".", LUA_DIRSEP);
const char *path = NULL;
#if defined(LUA_COMPAT_PATH)
/* try first `LUA_PATH' for compatibility */
lua_pushstring(L, "LUA_PATH");
lua_rawget(L, LUA_GLOBALSINDEX);
const char *path;
lua_getfield(L, LUA_ENVIRONINDEX, pname);
path = lua_tostring(L, -1);
#endif
if (!path) {
lua_pop(L, 1);
lua_getfield(L, LUA_ENVIRONINDEX, "path");
path = lua_tostring(L, -1);
}
if (path == NULL)
luaL_error(L, LUA_QL("package.path") " must be a string");
fname = luaL_searchpath(L, fname, path);
luaL_error(L, LUA_QL("package.%s") " must be a string", pname);
return luaL_searchpath(L, fname, path);
}
static void loaderror (lua_State *L, const char *msg) {
luaL_error(L, "error loading package " LUA_QS " (%s)",
lua_tostring(L, 1), msg);
}
static int loader_Lua (lua_State *L) {
const char *fname;
fname = findfile(L, "path");
if (fname == NULL) return 0; /* library not found in this path */
if (luaL_loadfile(L, fname) != 0)
luaL_error(L, "error loading package " LUA_QS " (%s)",
name, lua_tostring(L, -1));
loaderror(L, lua_tostring(L, -1));
return 1; /* library loaded successfully */
}
static int loader_C (lua_State *L) {
const char *name = luaL_checkstring(L, 1);
const char *fname = luaL_gsub(L, name, ".", LUA_DIRSEP);
const char *path;
const char *funcname;
lua_getfield(L, LUA_ENVIRONINDEX, "cpath");
path = lua_tostring(L, -1);
if (path == NULL)
luaL_error(L, LUA_QL("package.cpath") " must be a string");
fname = luaL_searchpath(L, fname, path);
const char *fname = findfile(L, "cpath");
if (fname == NULL) return 0; /* library not found in this path */
funcname = luaL_gsub(L, name, ".", LUA_OFSEP);
funcname = lua_pushfstring(L, "%s%s", POF, funcname);
funcname = luaL_gsub(L, lua_tostring(L, 1), ".", LUA_OFSEP);
funcname = lua_pushfstring(L, POF"%s", funcname);
if (ll_loadfunc(L, fname, funcname) != 1)
luaL_error(L, "error loading package " LUA_QS " (%s)",
name, lua_tostring(L, -2));
loaderror(L, lua_tostring(L, -2));
return 1; /* library loaded successfully */
}
@ -384,13 +378,13 @@ static int loader_preload (lua_State *L) {
}
static void require_aux (lua_State *L, const char *name) {
static int require_aux (lua_State *L, const char *name) {
int i;
int loadedtable = lua_gettop(L) + 1;
lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
lua_getfield(L, loadedtable, name);
if (lua_toboolean(L, -1)) /* is it there? */
return; /* package is already loaded; return its result */
return 1; /* package is already loaded */
/* else must load it; iterate over available loaders */
lua_getfield(L, LUA_ENVIRONINDEX, "loaders");
if (!lua_istable(L, -1))
@ -398,7 +392,7 @@ static void require_aux (lua_State *L, const char *name) {
for (i=1; ; i++) {
lua_rawgeti(L, -1, i); /* get a loader */
if (lua_isnil(L, -1))
luaL_error(L, "package " LUA_QS " not found", name);
return 0; /* package not found */
lua_pushstring(L, name);
lua_call(L, 1, 1); /* call it */
if (lua_isnil(L, -1)) lua_pop(L, 1); /* did not found module */
@ -416,7 +410,20 @@ static void require_aux (lua_State *L, const char *name) {
if (!lua_isnil(L, -1)) /* non-nil return? */
lua_setfield(L, loadedtable, name); /* _LOADED[name] = returned value */
lua_getfield(L, loadedtable, name); /* return _LOADED[name] */
return;
return 1;
}
static void ll_error (lua_State *L, const char *name) {
const char *msg;
lua_settop(L, 1);
lua_getfield(L, LUA_ENVIRONINDEX, "path");
lua_getfield(L, LUA_ENVIRONINDEX, "cpath");
msg = lua_pushfstring(L, "package " LUA_QS " not found in following paths:\n"
" Lua path: %s\n C path: %s\n", name,
lua_tostring(L, -2), lua_tostring(L, -1));
msg = luaL_gsub(L, msg, LUA_PATHSEP, "\n ");
luaL_error(L, msg);
}
@ -429,7 +436,8 @@ static int ll_require (lua_State *L) {
lua_pushlstring(L, name, pt - name);
require_aux(L, lua_tostring(L, -1));
}
require_aux(L, name); /* load module itself */
if (!require_aux(L, name)) /* load module itself */
ll_error(L, name);
return 1;
}
@ -490,15 +498,19 @@ static int ll_module (lua_State *L) {
/* }====================================================== */
/* auxiliary mark (for internal use) */
#define AUXMARK "\1"
static void setpath (lua_State *L, const char *fname, const char *envname,
const char *def) {
const char *path = getenv(envname);
if (path == NULL) lua_pushstring(L, def);
if (path == NULL) /* no environment variable? */
lua_pushstring(L, def); /* use default */
else {
/* replace ";;" by default path */
/* replace ";;" by ";AUXMARK;" and then AUXMARK by default path */
path = luaL_gsub(L, path, LUA_PATHSEP LUA_PATHSEP,
LUA_PATHSEP"\1"LUA_PATHSEP);
luaL_gsub(L, path, "\1", def);
LUA_PATHSEP AUXMARK LUA_PATHSEP);
luaL_gsub(L, path, AUXMARK, def);
lua_remove(L, -2);
}
setprogdir(L);
@ -507,8 +519,8 @@ static void setpath (lua_State *L, const char *fname, const char *envname,
static const luaL_reg ll_funcs[] = {
{"require", ll_require},
{"module", ll_module},
{"require", ll_require},
{NULL, NULL}
};