2 FFLuCI - Utility library
5 Several common useful Lua functions
11 Copyright 2008 Steven Barth <steven@midlink.org>
13 Licensed under the Apache License, Version 2.0 (the "License");
14 you may not use this file except in compliance with the License.
15 You may obtain a copy of the License at
17 http://www.apache.org/licenses/LICENSE-2.0
19 Unless required by applicable law or agreed to in writing, software
20 distributed under the License is distributed on an "AS IS" BASIS,
21 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
22 See the License for the specific language governing permissions and
23 limitations under the License.
27 module("ffluci.util", package.seeall)
30 -- Lua simplified Python-style OO class support emulation
34 local create = function(class, ...)
36 setmetatable(inst, {__index = class})
45 local classmeta = {__call = create}
48 classmeta.__index = base
51 setmetatable(class, classmeta)
56 -- Checks whether a table has an object "value" in it
57 function contains(table, value)
58 for k,v in pairs(table) do
67 -- Dumps a table to stdout (useful for testing and debugging)
68 function dumptable(t, i)
70 for k,v in pairs(t) do
71 print(string.rep("\t", i) .. k, v)
72 if type(v) == "table" then
79 -- Escapes all occurences of c in s
82 return s:gsub(c, "\\" .. c)
86 -- Runs "command" and returns its output
87 function exec(command)
88 local pp = io.popen(command)
89 local data = pp:read("*a")
96 -- Runs "command" and returns its output as a array of lines
97 function execl(command)
98 local pp = io.popen(command)
104 if (line == nil) then break end
105 table.insert(data, line)
113 -- Populate obj in the scope of f as key
114 function extfenv(f, key, obj)
115 local scope = getfenv(f)
120 -- Checks whether an object is an instanceof class
121 function instanceof(object, class)
122 local meta = getmetatable(object)
123 while meta and meta.__index do
124 if meta.__index == class then
127 meta = getmetatable(meta.__index)
133 -- Resets the scope of f doing a shallow copy of its scope into a new table
135 local scope = getfenv(f)
141 -- Updates the scope of f with "extscope"
142 function updfenv(f, extscope)
143 local scope = getfenv(f)
144 for k, v in pairs(extscope) do
150 -- Validates a variable
151 function validate(value, cast_number, cast_int, valid)
152 if cast_number or cast_int then
153 value = tonumber(value)
156 if cast_int and not(value % 1 == 0) then
161 if type(valid) == "function" then
163 elseif type(valid) == "table" then
164 if not contains(valid, value) then
173 -- Returns the filename of the calling script
175 return debug.getinfo(2, 'S').source:sub(2)