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Edit File: compat-5.1.lua

-- -- 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