setmetatable(inst, {__index = class})
if inst.__init__ then
- inst:__init__(...)
+ local stat, err = pcall(inst.__init__, inst, ...)
+ if not stat then
+ error(err)
+ end
end
return inst
return data
end
+
-- Runs "command" and returns its output as a array of lines
function execl(command)
local pp = io.popen(command)
return data
end
+
-- Populate obj in the scope of f as key
function extfenv(f, key, obj)
local scope = getfenv(f)
scope[key] = obj
- setfenv(f, scope)
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)
+ local scope = getfenv(f)
+ setfenv(f, {})
+ updfenv(f, scope)
+end
+
+
+-- Returns the Haserl unique sessionid
+function sessionid()
+ return ENV.SESSIONID
+end
+
-- Updates the scope of f with "extscope"
function updfenv(f, extscope)
local scope = getfenv(f)
for k, v in pairs(extscope) do
scope[k] = v
end
- setfenv(f, scope)
end
+
+-- Validates a variable
+function validate(value, cast_number, cast_int, valid)
+ if cast_number or cast_int then
+ value = tonumber(value)
+ end
+
+ if cast_int 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)