Re: DSL in lua

[Coda Highland <chighland@...>]

The = is just an efficiency thing, you can write it without it. It's
the commas that are important.

It'd probably end up looking something like

function owner(name) return {key='owner', value=name} end

and then the function returned by directory() would iterate over the
members of the table passed to it and construct a table based on that.

/s/ Adam

On Wed, Dec 5, 2012 at 10:48 PM, Vasiliy Tolstov <v.tolstov@selfip.ru> wrote:
> Thanks. But = sign i think is ambigious... How can i avoid using = sign?
>
> 2012/12/6 Dirk Laurie <dirk.laurie@gmail.com>:
>> You're a few commas away from legal Lua syntax.
>>
>> directory "/etc/" {
>>   owner "root",
>>   group "wheel",
>>   mode "0755",
>>   action "create",
>> }
>>
>> It can be done (functions owner etc would have to store
>> their argument somewhere) but a few equal signs makes the
>> Lua code efficient:
>>
>> directory "/etc/" {
>>   owner="root",
>>   group="wheel",
>>   mode="0755",
>>   action="create",
>> }
>>
>> The code would be (not tested):
>>
>> function directory(dirname)
>>    return function(t)
>>       os.execute ("mkdir %s; chown %s.%s %s; chmod %s %s"):
>>          format(dirname,t.owner,t.group,dirname,t.mode,dirname)
>>    end
>> end
>>
>> Or one could replace the `{`..`}` by `[[`..`]]` and insert
>> a small parser that extracts the fields from the string.
>>
>
>
>
> --
> Vasiliy Tolstov,
> Clodo.ru
> e-mail: v.tolstov@selfip.ru
> jabber: vase@selfip.ru
>