iodine: moved to github
[openwrt.org/packages.git] / lang / compat-5.1.lua
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--
-- Compat-5.1
-- Copyright Kepler Project 2004-2006 (http://www.keplerproject.org/compat)
-- According to Lua 5.1
-- $Id: compat-5.1.lua,v 1.22 2006/02/20 21:12:47 carregal Exp $
--
 
_COMPAT51 = "Compat-5.1 R5"
 
local LUA_DIRSEP = '/'
local LUA_OFSEP = '_'
local OLD_LUA_OFSEP = ''
local POF = 'luaopen_'
local LUA_PATH_MARK = '?'
local LUA_IGMARK = ':'
 
local assert, error, getfenv, ipairs, loadfile, loadlib, pairs, setfenv, setmetatable, type = assert, error, getfenv, ipairs, loadfile, loadlib, pairs, setfenv, setmetatable, type
local find, format, gfind, gsub, sub = string.find, string.format, string.gfind, string.gsub, string.sub
 
--
-- avoid overwriting the package table if it's already there
--
package = package or {}
local _PACKAGE = package
 
package.path = LUA_PATH or os.getenv("LUA_PATH") or
             ("./?.lua;" ..
              "/usr/local/share/lua/5.0/?.lua;" ..
              "/usr/local/share/lua/5.0/?/?.lua;" ..
              "/usr/local/share/lua/5.0/?/init.lua" )
 
package.cpath = LUA_CPATH or os.getenv("LUA_CPATH") or
             "./?.so;" ..
             "./l?.so;" ..
             "/usr/local/lib/lua/5.0/?.so;" ..
             "/usr/local/lib/lua/5.0/l?.so"
 
--
-- make sure require works with standard libraries
--
package.loaded = package.loaded or {}
package.loaded.debug = debug
package.loaded.string = string
package.loaded.math = math
package.loaded.io = io
package.loaded.os = os
package.loaded.table = table 
package.loaded.base = _G
package.loaded.coroutine = coroutine
local _LOADED = package.loaded
 
--
-- avoid overwriting the package.preload table if it's already there
--
package.preload = package.preload or {}
local _PRELOAD = package.preload
 
 
--
-- looks for a file `name' in given path
--
local function findfile (name, pname)
        name = gsub (name, "%.", LUA_DIRSEP)
        local path = _PACKAGE[pname]
        assert (type(path) == "string", format ("package.%s must be a string", pname))
        for c in gfind (path, "[^;]+") do
                c = gsub (c, "%"..LUA_PATH_MARK, name)
                local f = io.open (c)
                if f then
                        f:close ()
                        return c
                end
        end
        return nil -- not found
end
 
 
--
-- check whether library is already loaded
--
local function loader_preload (name)
        assert (type(name) == "string", format (
                "bad argument #1 to `require' (string expected, got %s)", type(name)))
        assert (type(_PRELOAD) == "table", "`package.preload' must be a table")
        return _PRELOAD[name]
end
 
 
--
-- Lua library loader
--
local function loader_Lua (name)
        assert (type(name) == "string", format (
                "bad argument #1 to `require' (string expected, got %s)", type(name)))
        local filename = findfile (name, "path")
        if not filename then
                return false
        end
        local f, err = loadfile (filename)
        if not f then
                error (format ("error loading module `%s' (%s)", name, err))
        end
        return f
end
 
 
local function mkfuncname (name)
        name = gsub (name, "^.*%"..LUA_IGMARK, "")
        name = gsub (name, "%.", LUA_OFSEP)
        return POF..name
end
 
local function old_mkfuncname (name)
        --name = gsub (name, "^.*%"..LUA_IGMARK, "")
        name = gsub (name, "%.", OLD_LUA_OFSEP)
        return POF..name
end
 
--
-- C library loader
--
local function loader_C (name)
        assert (type(name) == "string", format (
                "bad argument #1 to `require' (string expected, got %s)", type(name)))
        local filename = findfile (name, "cpath")
        if not filename then
                return false
        end
        local funcname = mkfuncname (name)
        local f, err = loadlib (filename, funcname)
        if not f then
                funcname = old_mkfuncname (name)
                f, err = loadlib (filename, funcname)
                if not f then
                        error (format ("error loading module `%s' (%s)", name, err))
                end
        end
        return f
end
 
 
local function loader_Croot (name)
        local p = gsub (name, "^([^.]*).-$", "%1")
        if p == "" then
                return
        end
        local filename = findfile (p, "cpath")
        if not filename then
                return
        end
        local funcname = mkfuncname (name)
        local f, err, where = loadlib (filename, funcname)
        if f then
                return f
        elseif where ~= "init" then
                error (format ("error loading module `%s' (%s)", name, err))
        end
end
 
-- create `loaders' table
package.loaders = package.loaders or { loader_preload, loader_Lua, loader_C, loader_Croot, }
local _LOADERS = package.loaders
 
 
--
-- iterate over available loaders
--
local function load (name, loaders)
        -- iterate over available loaders
        assert (type (loaders) == "table", "`package.loaders' must be a table")
        for i, loader in ipairs (loaders) do
                local f = loader (name)
                if f then
                        return f
                end
        end
        error (format ("module `%s' not found", name))
end
 
-- sentinel
local sentinel = function () end
 
--
-- new require
--
function _G.require (modname)
        assert (type(modname) == "string", format (
                "bad argument #1 to `require' (string expected, got %s)", type(name)))
        local p = _LOADED[modname]
        if p then -- is it there?
                if p == sentinel then
                        error (format ("loop or previous error loading module '%s'", modname))
                end
                return p -- package is already loaded
        end
        local init = load (modname, _LOADERS)
        _LOADED[modname] = sentinel
        local actual_arg = _G.arg
        _G.arg = { modname }
        local res = init (modname)
        if res then
                _LOADED[modname] = res
        end
        _G.arg = actual_arg
        if _LOADED[modname] == sentinel then
                _LOADED[modname] = true
        end
        return _LOADED[modname]
end
 
 
-- findtable
local function findtable (t, f)
        assert (type(f)=="string", "not a valid field name ("..tostring(f)..")")
        local ff = f.."."
        local ok, e, w = find (ff, '(.-)%.', 1)
        while ok do
                local nt = rawget (t, w)
                if not nt then
                        nt = {}
                        t[w] = nt
                elseif type(t) ~= "table" then
                        return sub (f, e+1)
                end
                t = nt
                ok, e, w = find (ff, '(.-)%.', e+1)
        end
        return t
end
 
--
-- new package.seeall function
--
function _PACKAGE.seeall (module)
        local t = type(module)
        assert (t == "table", "bad argument #1 to package.seeall (table expected, got "..t..")")
        local meta = getmetatable (module)
        if not meta then
                meta = {}
                setmetatable (module, meta)
        end
        meta.__index = _G
end
 
 
--
-- new module function
--
function _G.module (modname, ...)
        local ns = _LOADED[modname]
        if type(ns) ~= "table" then
                ns = findtable (_G, modname)
                if not ns then
                        error (string.format ("name conflict for module '%s'", modname))
                end
                _LOADED[modname] = ns
        end
        if not ns._NAME then
                ns._NAME = modname
                ns._M = ns
                ns._PACKAGE = gsub (modname, "[^.]*$", "")
        end
        setfenv (2, ns)
        for i, f in ipairs (arg) do
                f (ns)
        end
end
 
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