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| -rw-r--r-- | util/require.lua | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/util/require.lua b/util/require.lua new file mode 100644 index 00000000..e09e6c1b --- /dev/null +++ b/util/require.lua @@ -0,0 +1,237 @@ +-- Prosody IM +-- Copyright (C) 2008-2009 Matthew Wild +-- Copyright (C) 2008-2009 Waqas Hussain +-- +-- This project is MIT/X11 licensed. Please see the +-- COPYING file in the source package for more information. +-- +-- Based on Kepler Compat-5.1 code +-- Copyright Kepler Project 2004-2006 (http://www.keplerproject.org/compat) +-- $Id: compat-5.1.lua,v 1.22 2006/02/20 21:12:47 carregal Exp $ +-- + +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 + +if package.nonglobal_module then return; end +package.nonglobal_module = true; + +local _PACKAGE = package +local _LOADED = package.loaded +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 + +local old_require = _G.require; +local dep_path = {}; +local current_env = nil; +function _G.require(modname) + --table.insert(dep_path, modname); + --if getfenv(2) == getfenv(0) --[[and rawget(_G, "__locked")]] then + -- print("**** Uh-oh, require called from locked global env at "..table.concat(dep_path, "->"), debug.traceback()); + --end + if not current_env and rawget(_G, "__locked") then + _G.prosody.unlock_globals(); + _G.__locked = false; + end + local old_current_env; + old_current_env, current_env = current_env, getfenv(2); + local ok, ret = pcall(old_require, modname); + current_env = old_current_env; + if not current_env and rawget(_G, "__locked") == false then + _G.prosody.lock_globals(); + end + --table.remove(dep_path); + if not ok then error(ret, 0); end + return ret; +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 + --if not current_env then + -- print("module outside require for "..modname.." at "..debug.traceback()); + --end + ns = findtable (current_env or getfenv(2), 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 |