José, thanks, I’ll put a simple case together. I have tried the unquote
fragment approach first. Like:
Enum.each Cldr.known_locales, fn (locale) ->
function_body = cardinal_rules[locale] |>
rules_to_condition_statement(__MODULE__)
defp do_cardinal(unquote(locale), n, i, v, w, f, t), do:
unquote(function_body)
end
But in that case the `unquote(body)` became an AST literal for the function
body rather than the AST being merged into the function definition.
> On 29 Jul 2016, at 8:12 PM, José Valim <[email protected]>
> wrote:
>
> Elixir supports something called unquote fragments, which means you can get
> rid of quote and the eval and it should just work. If not, please provide a
> sample file and I can take a look when j get back home.
>
> On Friday, July 29, 2016, Kip Cole <[email protected]
> <mailto:[email protected]>> wrote:
> 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 <[email protected]
>> <javascript:_e(%7B%7D,'cvml','[email protected]');>> 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 <[email protected]
>> <javascript:_e(%7B%7D,'cvml','[email protected]');>> 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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>> Skype: jv.ptec
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> Skype: jv.ptec
> Founder and Director of R&D
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