Re: Explanation needed for setfenv replacement for Lua 5.2
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- Subject: Re: Explanation needed for setfenv replacement for Lua 5.2
- From: "E. Toernig" <froese@...>
- Date: Thu, 5 May 2011 22:53:48 +0200
| lib.Interpreter( function(_ENV)
| AddItem "hello!"
| AddItem(AN_UPVALUE)
| AddItem "Hope You Enjoy!"
|
| PrintResult() --> hello! This is a silly DSL! Hope You Enjoy!
| end)
> It is still too boilerplate IMO when explaining how to write a DSL
> snippet to a non-programmer
Just an idea: How about misusing the for statement?
| for _ENV in lib.Interpreter do
| AddItem "hello!"
| AddItem(AN_UPVALUE)
| AddItem "Hope You Enjoy!"
|
| PrintResult() --> hello! This is a silly DSL! Hope You Enjoy!
| end
Still the _ENV but it's readable ;-)
Full code below:
------------------------------------------------------
function Interpreter(_, second_iteration)
if second_iteration then return end
local private_data = {}
return {
AddItem = function(item) table.insert(private_data, item) end,
PrintResult = function() print(table.concat(private_data, " ")) end,
}
end
-- client code
local AN_UPVALUE = "This is a silly DSL!"
for _ENV in Interpreter do
AddItem "hello!"
AddItem(AN_UPVALUE)
AddItem "Hope You Enjoy!"
PrintResult() --> hello! This is a silly DSL! Hope You Enjoy!
end
------------------------------------------------------
Ciao, ET.