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--[[
FFLuCI - Utility library
Description:
Several common useful Lua functions
FileId:
$Id$
License:
Copyright 2008 Steven Barth <steven@midlink.org>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
]]--
module("ffluci.util", package.seeall)
-- Lua simplified Python-style OO class support emulation
function class(base)
local class = {}
local create = function(class, ...)
local inst = {}
setmetatable(inst, {__index = class})
if inst.__init__ then
local stat, err = pcall(inst.__init__, inst, ...)
if not stat then
error(err)
end
end
return inst
end
local classmeta = {__call = create}
if base then
classmeta.__index = base
end
setmetatable(class, classmeta)
return class
end
-- Clones an object (deep on-demand)
function clone(object, deep)
local copy = {}
for k, v in pairs(object) do
if deep and type(v) == "table" then
v = clone(v, deep)
end
copy[k] = v
end
setmetatable(copy, getmetatable(object))
return copy
end
-- Checks whether a table has an object "value" in it
function contains(table, value)
for k,v in pairs(table) do
if value == v then
return true
end
end
return false
end
-- Dumps a table to stdout (useful for testing and debugging)
function dumptable(t, i)
i = i or 0
for k,v in pairs(t) do
print(string.rep("\t", i) .. k, v)
if type(v) == "table" then
dumptable(v, i+1)
end
end
end
-- Escapes all occurences of c in s
function escape(s, c)
c = c or "\\"
return s:gsub(c, "\\" .. c)
end
-- Runs "command" and returns its output
function exec(command)
local pp = io.popen(command)
local data = pp:read("*a")
pp:close()
return data
end
-- Runs "command" and returns its output as a array of lines
function execl(command)
local pp = io.popen(command)
local line = ""
local data = {}
while true do
line = pp:read()
if (line == nil) then break end
table.insert(data, line)
end
pp:close()
return data
end
-- Populate obj in the scope of f as key
function extfenv(f, key, obj)
local scope = getfenv(f)
scope[key] = obj
end
-- Checks whether an object is an instanceof class
function instanceof(object, class)
local meta = getmetatable(object)
while meta and meta.__index do
if meta.__index == class then
return true
end
meta = getmetatable(meta.__index)
end
return false
end
-- Resets the scope of f doing a shallow copy of its scope into a new table
function resfenv(f)
setfenv(f, clone(getfenv(f)))
end
-- Returns the Haserl unique sessionid
function sessionid()
return ENV.SESSIONID
end
-- Splits a string into an array (Taken from lua-users.org)
function split(str, pat)
pat = pat or "\n"
local t = {}
local fpat = "(.-)" .. pat
local last_end = 1
local s, e, cap = str:find(fpat, 1)
while s do
if s ~= 1 or cap ~= "" then
table.insert(t,cap)
end
last_end = e+1
s, e, cap = str:find(fpat, last_end)
end
if last_end <= #str then
cap = str:sub(last_end)
table.insert(t, cap)
end
return t
end
-- Updates given table with new values
function update(t, updates)
for k, v in pairs(updates) do
t[k] = v
end
end
-- Updates the scope of f with "extscope"
function updfenv(f, extscope)
update(getfenv(f), extscope)
end
-- Validates a variable
function validate(value, valid, cast_number, cast_int)
if cast_number or cast_int then
value = tonumber(value)
end
if cast_int and value and not(value % 1 == 0) then
value = nil
end
if type(valid) == "function" then
value = valid(value)
elseif type(valid) == "table" then
if not contains(valid, value) then
value = nil
end
end
return value
end
-- Returns the filename of the calling script
function __file__()
return debug.getinfo(2, 'S').source:sub(2)
end
|
