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new scheme to search paths

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This commit is contained in:
Roberto Ierusalimschy 2004-06-21 17:05:29 -03:00
parent 6b41e84da5
commit 0c49857c1a
3 changed files with 80 additions and 75 deletions
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52
lauxlib.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lauxlib.c,v 1.115 2004/06/02 19:06:14 roberto Exp roberto $
** $Id: lauxlib.c,v 1.116 2004/06/17 14:06:52 roberto Exp roberto $
** Auxiliary functions for building Lua libraries
** See Copyright Notice in lua.h
*/
@ -342,6 +342,56 @@ LUALIB_API int luaL_getn (lua_State *L, int t) {
static const char *pushnexttemplate (lua_State *L, const char *path) {
const char *l;
if (*path == '\0') return NULL; /* no more templates */
if (*path == LUA_PATH_SEP) path++; /* skip separator */
l = strchr(path, LUA_PATH_SEP); /* find next separator */
if (l == NULL) l = path+strlen(path);
lua_pushlstring(L, path, l - path); /* template */
return l;
}
static void pushcomposename (lua_State *L) {
const char *tem = lua_tostring(L, -1);
const char *wild;
int n = 1;
while ((wild = strchr(tem, LUA_PATH_MARK)) != NULL) {
/* is there stack space for prefix, name, and eventual last suffix? */
luaL_checkstack(L, 3, "too many marks in a path component");
lua_pushlstring(L, tem, wild - tem); /* push prefix */
lua_pushvalue(L, 1); /* push package name (in place of MARK) */
tem = wild + 1; /* continue after MARK */
n += 2;
}
lua_pushstring(L, tem); /* push last suffix (`n' already includes this) */
lua_concat(L, n);
}
LUALIB_API int luaL_searchpath (lua_State *L, const char *name,
const char *path, luaL_Loader f, void *data) {
int status;
const char *p = path;
int top = lua_gettop(L);
do {
lua_settop(L, top);
if ((p = pushnexttemplate(L, p)) == NULL) {
lua_pushfstring(L, "cound not find `%s' in path `%s'", name, path);
return LUA_ERRFILE;
}
pushcomposename(L);
lua_remove(L, -2); /* remove path template */
lua_assert(lua_gettop(L) == top + 1);
status = f(data, lua_tostring(L, -1)); /* try to load it */
lua_remove(L, top+1); /* remove file name */
} while (status == LUA_ERRFILE);
return status;
}
/*
** {======================================================
** Generic Buffer manipulation

7
lauxlib.h
View File

@ -1,5 +1,5 @@
/*
** $Id: lauxlib.h,v 1.65 2004/05/31 19:27:14 roberto Exp roberto $
** $Id: lauxlib.h,v 1.66 2004/06/02 17:37:03 roberto Exp roberto $
** Auxiliary functions for building Lua libraries
** See Copyright Notice in lua.h
*/
@ -25,6 +25,8 @@ typedef struct luaL_reg {
} luaL_reg;
typedef int (*luaL_Loader)(void *data, const char *name);
LUALIB_API void luaL_openlib (lua_State *L, const char *libname,
const luaL_reg *l, int nup);
LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *e);
@ -54,6 +56,9 @@ LUALIB_API int luaL_error (lua_State *L, const char *fmt, ...);
LUALIB_API int luaL_findstring (const char *st, const char *const lst[]);
LUALIB_API int luaL_searchpath (lua_State *L, const char *name,
const char *path, luaL_Loader f, void *data);
LUALIB_API int luaL_ref (lua_State *L, int t);
LUALIB_API void luaL_unref (lua_State *L, int t, int ref);

96
lbaselib.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lbaselib.c,v 1.147 2004/06/15 13:31:30 roberto Exp roberto $
** $Id: lbaselib.c,v 1.148 2004/06/21 16:45:09 roberto Exp roberto $
** Basic library
** See Copyright Notice in lua.h
*/
@ -261,7 +261,11 @@ static int luaB_loadstring (lua_State *L) {
static int luaB_loadfile (lua_State *L) {
const char *fname = luaL_optstring(L, 1, NULL);
return load_aux(L, luaL_loadfile(L, fname));
const char *path = luaL_optstring(L, 2, NULL);
int status = (path == NULL)
? luaL_loadfile(L, fname)
: luaL_searchpath(L, fname, path, (luaL_Loader)luaL_loadfile, L);
return load_aux(L, status);
}
@ -455,7 +459,6 @@ static const char *getpath (lua_State *L) {
const char *path;
lua_getglobal(L, LUA_PATH); /* try global variable */
path = lua_tostring(L, -1);
lua_pop(L, 1);
if (path) return path;
path = getenv(LUA_PATH); /* else try environment variable */
if (path) return path;
@ -463,81 +466,28 @@ static const char *getpath (lua_State *L) {
}
static const char *pushnextpath (lua_State *L, const char *path) {
const char *l;
if (*path == '\0') return NULL; /* no more paths */
if (*path == LUA_PATH_SEP) path++; /* skip separator */
l = strchr(path, LUA_PATH_SEP); /* find next separator */
if (l == NULL) l = path+strlen(path);
lua_pushlstring(L, path, l - path); /* directory name */
return l;
}
static void pushcomposename (lua_State *L) {
const char *path = lua_tostring(L, -1);
const char *wild;
int n = 1;
while ((wild = strchr(path, LUA_PATH_MARK)) != NULL) {
/* is there stack space for prefix, name, and eventual last suffix? */
luaL_checkstack(L, 3, "too many marks in a path component");
lua_pushlstring(L, path, wild - path); /* push prefix */
lua_pushvalue(L, 1); /* push package name (in place of MARK) */
path = wild + 1; /* continue after MARK */
n += 2;
}
lua_pushstring(L, path); /* push last suffix (`n' already includes this) */
lua_concat(L, n);
}
static int luaB_require (lua_State *L) {
const char *path;
int status = LUA_ERRFILE; /* not found (yet) */
luaL_checkstring(L, 1);
lua_settop(L, 1);
const char *name = luaL_checkstring(L, 1);
const char *path = getpath(L);
lua_getglobal(L, REQTAB);
if (!lua_istable(L, 2)) return luaL_error(L, "`" REQTAB "' is not a table");
path = getpath(L);
lua_pushvalue(L, 1); /* check package's name in book-keeping table */
lua_rawget(L, 2);
if (!lua_istable(L, -1))
return luaL_error(L, "global `" REQTAB "' is not a table");
lua_getfield(L, -1, name);
if (lua_toboolean(L, -1)) /* is it there? */
return 1; /* package is already loaded; return its result */
else { /* must load it */
while (status == LUA_ERRFILE) {
lua_settop(L, 3); /* reset stack position */
if ((path = pushnextpath(L, path)) == NULL) break;
pushcomposename(L);
status = luaL_loadfile(L, lua_tostring(L, -1)); /* try to load it */
}
}
switch (status) {
case 0: {
lua_getglobal(L, "_REQUIREDNAME"); /* save previous name */
lua_insert(L, -2); /* put it below function */
lua_pushvalue(L, 1);
lua_setglobal(L, "_REQUIREDNAME"); /* set new name */
lua_call(L, 0, 1); /* run loaded module */
lua_insert(L, -2); /* put result below previous name */
lua_setglobal(L, "_REQUIREDNAME"); /* reset to previous name */
if (lua_isnil(L, -1)) { /* no/nil return? */
lua_pushboolean(L, 1);
lua_replace(L, -2); /* replace to true */
}
lua_pushvalue(L, 1);
lua_pushvalue(L, -2);
lua_rawset(L, 2); /* mark it as loaded */
return 1; /* return value */
}
case LUA_ERRFILE: { /* file not found */
return luaL_error(L, "could not load package `%s' from path `%s'",
lua_tostring(L, 1), getpath(L));
}
default: {
return luaL_error(L, "error loading package `%s' (%s)",
lua_tostring(L, 1), lua_tostring(L, -1));
}
/* else must load it */
if (luaL_searchpath(L, name, path, (luaL_Loader)luaL_loadfile, L) != 0)
return luaL_error(L, "error loading package `%s' (%s)", name,
lua_tostring(L, -1));
lua_pushvalue(L, 1); /* pass name as argument to module */
lua_call(L, 1, 1); /* run loaded module */
if (lua_isnil(L, -1)) { /* nil return? */
lua_pop(L, 1); /* remove it */
lua_pushboolean(L, 1); /* replace to true */
}
lua_pushvalue(L, -1); /* duplicate result (to return it) */
lua_setfield(L, -4, name); /* mark `name' as loaded */
return 1; /* return value */
}
/* }====================================================== */