95097b00dd0607dcf31594b26b983455d3a6448b
1 --
2 -- Compat-5.1
3 -- Copyright Kepler Project 2004-2006 (http://www.keplerproject.org/compat)
4 -- According to Lua 5.1
5 -- $Id: compat-5.1.lua,v 1.22 2006/02/20 21:12:47 carregal Exp $
6 --
7 -- Compat-5.1 is free software: it can be used for both academic and commercial
8 -- purposes at absolutely no cost. There are no royalties or GNU-like
9 -- "copyleft" restrictions. Compat-5.1 qualifies as Open Source software. Its
10 -- licenses are compatible with GPL. Compat-5.1 is not in the public domain and
11 -- the Kepler Project keep its copyright. The legal details are below.
12 --
13 -- The spirit of the license is that you are free to use Compat-5.1 for any
14 -- purpose at no cost without having to ask us. The only requirement is that if
15 -- you do use Compat-5.1, then you should give us credit by including the
16 -- appropriate copyright notice somewhere in your product or its documentation.
17 --
18 -- The Compat-5.1 library is designed and implemented by Roberto Ierusalimschy,
19 -- Diego Nehab, André Carregal and Tomás Guisasola. The implementation is not
20 -- derived from licensed software.
21 --
23 _COMPAT51 = "Compat-5.1 R5"
25 local LUA_DIRSEP = '/'
26 local LUA_OFSEP = '_'
27 local OLD_LUA_OFSEP = ''
28 local POF = 'luaopen_'
29 local LUA_PATH_MARK = '?'
30 local LUA_IGMARK = ':'
32 local assert, error, getfenv, ipairs, loadfile, loadlib, pairs, setfenv, setmetatable, type = assert, error, getfenv, ipairs, loadfile, loadlib, pairs, setfenv, setmetatable, type
33 local find, format, gfind, gsub, sub = string.find, string.format, string.gfind, string.gsub, string.sub
35 --
36 -- avoid overwriting the package table if it's already there
37 --
38 package = package or {}
39 local _PACKAGE = package
41 package.path = LUA_PATH or os.getenv("LUA_PATH") or
42 ("./?.lua;" ..
43 "/usr/local/share/lua/5.0/?.lua;" ..
44 "/usr/local/share/lua/5.0/?/?.lua;" ..
45 "/usr/local/share/lua/5.0/?/init.lua" )
47 package.cpath = LUA_CPATH or os.getenv("LUA_CPATH") or
48 "./?.so;" ..
49 "./l?.so;" ..
50 "/usr/local/lib/lua/5.0/?.so;" ..
51 "/usr/local/lib/lua/5.0/l?.so"
53 --
54 -- make sure require works with standard libraries
55 --
56 package.loaded = package.loaded or {}
57 package.loaded.debug = debug
58 package.loaded.string = string
59 package.loaded.math = math
60 package.loaded.io = io
61 package.loaded.os = os
62 package.loaded.table = table
63 package.loaded.base = _G
64 package.loaded.coroutine = coroutine
65 local _LOADED = package.loaded
67 --
68 -- avoid overwriting the package.preload table if it's already there
69 --
70 package.preload = package.preload or {}
71 local _PRELOAD = package.preload
74 --
75 -- looks for a file `name' in given path
76 --
77 local function findfile (name, pname)
78 name = gsub (name, "%.", LUA_DIRSEP)
79 local path = _PACKAGE[pname]
80 assert (type(path) == "string", format ("package.%s must be a string", pname))
81 for c in gfind (path, "[^;]+") do
82 c = gsub (c, "%"..LUA_PATH_MARK, name)
83 local f = io.open (c)
84 if f then
85 f:close ()
86 return c
87 end
88 end
89 return nil -- not found
90 end
93 --
94 -- check whether library is already loaded
95 --
96 local function loader_preload (name)
97 assert (type(name) == "string", format (
98 "bad argument #1 to `require' (string expected, got %s)", type(name)))
99 assert (type(_PRELOAD) == "table", "`package.preload' must be a table")
100 return _PRELOAD[name]
101 end
104 --
105 -- Lua library loader
106 --
107 local function loader_Lua (name)
108 assert (type(name) == "string", format (
109 "bad argument #1 to `require' (string expected, got %s)", type(name)))
110 local filename = findfile (name, "path")
111 if not filename then
112 return false
113 end
114 local f, err = loadfile (filename)
115 if not f then
116 error (format ("error loading module `%s' (%s)", name, err))
117 end
118 return f
119 end
122 local function mkfuncname (name)
123 name = gsub (name, "^.*%"..LUA_IGMARK, "")
124 name = gsub (name, "%.", LUA_OFSEP)
125 return POF..name
126 end
128 local function old_mkfuncname (name)
129 --name = gsub (name, "^.*%"..LUA_IGMARK, "")
130 name = gsub (name, "%.", OLD_LUA_OFSEP)
131 return POF..name
132 end
134 --
135 -- C library loader
136 --
137 local function loader_C (name)
138 assert (type(name) == "string", format (
139 "bad argument #1 to `require' (string expected, got %s)", type(name)))
140 local filename = findfile (name, "cpath")
141 if not filename then
142 return false
143 end
144 local funcname = mkfuncname (name)
145 local f, err = loadlib (filename, funcname)
146 if not f then
147 funcname = old_mkfuncname (name)
148 f, err = loadlib (filename, funcname)
149 if not f then
150 error (format ("error loading module `%s' (%s)", name, err))
151 end
152 end
153 return f
154 end
157 local function loader_Croot (name)
158 local p = gsub (name, "^([^.]*).-$", "%1")
159 if p == "" then
160 return
161 end
162 local filename = findfile (p, "cpath")
163 if not filename then
164 return
165 end
166 local funcname = mkfuncname (name)
167 local f, err, where = loadlib (filename, funcname)
168 if f then
169 return f
170 elseif where ~= "init" then
171 error (format ("error loading module `%s' (%s)", name, err))
172 end
173 end
175 -- create `loaders' table
176 package.loaders = package.loaders or { loader_preload, loader_Lua, loader_C, loader_Croot, }
177 local _LOADERS = package.loaders
180 --
181 -- iterate over available loaders
182 --
183 local function load (name, loaders)
184 -- iterate over available loaders
185 assert (type (loaders) == "table", "`package.loaders' must be a table")
186 for i, loader in ipairs (loaders) do
187 local f = loader (name)
188 if f then
189 return f
190 end
191 end
192 error (format ("module `%s' not found", name))
193 end
195 -- sentinel
196 local sentinel = function () end
198 --
199 -- new require
200 --
201 function _G.require (modname)
202 assert (type(modname) == "string", format (
203 "bad argument #1 to `require' (string expected, got %s)", type(name)))
204 local p = _LOADED[modname]
205 if p then -- is it there?
206 if p == sentinel then
207 error (format ("loop or previous error loading module '%s'", modname))
208 end
209 return p -- package is already loaded
210 end
211 local init = load (modname, _LOADERS)
212 _LOADED[modname] = sentinel
213 local actual_arg = _G.arg
214 _G.arg = { modname }
215 local res = init (modname)
216 if res then
217 _LOADED[modname] = res
218 end
219 _G.arg = actual_arg
220 if _LOADED[modname] == sentinel then
221 _LOADED[modname] = true
222 end
223 return _LOADED[modname]
224 end
227 -- findtable
228 local function findtable (t, f)
229 assert (type(f)=="string", "not a valid field name ("..tostring(f)..")")
230 local ff = f.."."
231 local ok, e, w = find (ff, '(.-)%.', 1)
232 while ok do
233 local nt = rawget (t, w)
234 if not nt then
235 nt = {}
236 t[w] = nt
237 elseif type(t) ~= "table" then
238 return sub (f, e+1)
239 end
240 t = nt
241 ok, e, w = find (ff, '(.-)%.', e+1)
242 end
243 return t
244 end
246 --
247 -- new package.seeall function
248 --
249 function _PACKAGE.seeall (module)
250 local t = type(module)
251 assert (t == "table", "bad argument #1 to package.seeall (table expected, got "..t..")")
252 local meta = getmetatable (module)
253 if not meta then
254 meta = {}
255 setmetatable (module, meta)
256 end
257 meta.__index = _G
258 end
261 --
262 -- new module function
263 --
264 function _G.module (modname, ...)
265 local ns = _LOADED[modname]
266 if type(ns) ~= "table" then
267 ns = findtable (_G, modname)
268 if not ns then
269 error (string.format ("name conflict for module '%s'", modname))
270 end
271 _LOADED[modname] = ns
272 end
273 if not ns._NAME then
274 ns._NAME = modname
275 ns._M = ns
276 ns._PACKAGE = gsub (modname, "[^.]*$", "")
277 end
278 setfenv (2, ns)
279 for i, f in ipairs (arg) do
280 f (ns)
281 end
282 end