Why one and two levels of call_args_parens, but not more?

[Luke Imhoff]

In the max_expr and block_expr, parens_call can be followed by either one call_args_parens or two call_args_parens, but no more.  Tracing the history, it looks like that part of the grammar originated from https://github.com/elixir-lang/elixir/commit/c7a7022bf32317aa664ab40fad97e902f8f8cedc.  From the tests, is two call_args_parens allowed just to support function call parentheses after unquote parentheses?  If that's the case why didn't the recursive form work out?  Did you want to prevent macro/dsl authors getting too far from standard Elixir syntax which only needs the 2 levels?

[José Valim]

We haven't allowed it just because the non-recursive solution is the simplest solution. :)

Allowing foo()()() wouldn't amount to valid elixir code anyway (unless in a quoted expression) and the only form that is allowed in actual code with two calls is unquote(foo)(bar).

José Valim

www.plataformatec.com.br

Skype: jv.ptec

Founder and Lead Developer

On Fri, Apr 24, 2015 at 4:41 AM, Luke Imhoff <kroni...@gmail.com> wrote:

In the max_expr and block_expr, parens_call can be followed by either one call_args_parens or two call_args_parens, but no more.  Tracing the history, it looks like that part of the grammar originated from https://github.com/elixir-lang/elixir/commit/c7a7022bf32317aa664ab40fad97e902f8f8cedc.  From the tests, is two call_args_parens allowed just to support function call parentheses after unquote parentheses?  If that's the case why didn't the recursive form work out?  Did you want to prevent macro/dsl authors getting too far from standard Elixir syntax which only needs the 2 levels?

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