José, thank you as always for your engagement.
I am basically hand-crafting the AST, mostly via leex/yecc with a few
after-parsing transformations. So I’m left with an AST in literal form (i.e.
as a list of tuples - is that the right expression?). What I’ve worked on in
the mean time that does what I want is:
# Generate the functions to process plural rules
@spec do_cardinal(binary, number, number, number, number, number, number)
:: :one | :two | :few | :many | :other
Enum.each Cldr.known_locales, fn (locale) ->
function_body = cardinal_rules[locale] |>
rules_to_condition_statement(__MODULE__)
function = quote do
defp do_cardinal(unquote(locale), n, i, v, w, f, t), do:
unquote(function_body)
end
Code.eval_quoted(function, [], __ENV__)
end
In this case there’s no macro involved but I feel a little “unclean” about
doing the Code.eval_quoted/3 part.
> On 29 Jul 2016, at 5:50 PM, José Valim <jose.va...@plataformatec.com.br>
> wrote:
>
> Well, quoted expressions are meant to represent the code unless it is
> escaped, then you get the AST literal. So maybe the question is where the AST
> is being escaped?
>
> On Friday, July 29, 2016, Kip Cole <kipco...@gmail.com
> <mailto:kipco...@gmail.com>> wrote:
> I have a macro to define a function where one of the parameters is the AST of
> the function body. But I can't work out how to insert the AST. Example:
>
> defmacro define_do_cardinal(rules, locale) do
> quote do
> defp do_cardinal(unquote(locale), n, i, v, w, f, t), do:
> unquote(rules)
> end
> end
>
> unquote(rules) won't do it since unquoting doesn't add the code to the
> function it just inserts the AST as a literal. I could, I suppose, hand
> craft the function header AST and insert the function body AST but that seems
> more work than I would expect.
>
> Is there a way to insert an AST as the code for a function body?
>
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