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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
-- Combines two or more numerically indexed tables into one
function combine(...)
local result = {}
for i, a in ipairs(arg) do
for j, v in ipairs(a) do
table.insert(result, v)
end
end
return result
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
-- 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
-- Creates valid XML PCDATA from a string
function pcdata(value)
value = value:gsub("&", "&")
value = value:gsub('"', """)
value = value:gsub("'", "'")
value = value:gsub("<", "<")
return value:gsub(">", ">")
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
-- Splits a string into an array
function split(str, pat, max, regex)
pat = pat or "\n"
max = max or #str
local t = {}
local c = 1
if #str == 0 then
return {""}
end
if #pat == 0 then
return nil
end
if max == 0 then
return str
end
repeat
local s, e = str:find(pat, c, not regex)
table.insert(t, str:sub(c, s and s - 1))
max = max - 1
c = e and e + 1 or #str + 1
until not s or max < 0
return t
end
-- Removes whitespace from beginning and end of a string
function trim(str)
local s = str:gsub("^%s*(.-)%s*$", "%1")
return s
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, 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
return value
end
|
