Re: DSL in lua

[steve donovan <steve.j.donovan@...>]

On Thu, Dec 6, 2012 at 8:53 AM, Vasiliy Tolstov <v.tolstov@selfip.ru> wrote:
> 1-2) can you provide me simple exmple, please.

function directory(path)
    local t = {path=path}
    return function (spec)
        for key,value in pairs(spec) do
            t[key] = value
        end
        create_directory(t)  ---> actually makes the directory
    end
end

So it's a function that returnsa function - or more accurately creates
a closure that has a reference to the local t (an 'upvalue')

If we had "directory '/tmp/foo' { owner='root' }" then
create_directory will be called with the table
{path='/tmp/foo',owner='root'}

steve d.