erl_eval_records

Erlang library for using records in erl_eval. Without extra manipulation you can not use records in interpret by erl_eval code. To solve this problems in erlang shell some magic is done.

This magic consist of:

• fetching records definitions
• copy it a fake module
• add fake function with code than needs to be run
• replace records in this code to tuples
• extract result code from fake function

Interface of this simple helper module contains functions represented 2 phases:

• load/1 (or load_all/1) to load records information from module(s)
• expand/2 expand records in given expressions

-record(foo, {a}).

test() ->
  {ok, Tokens  , _} = erl_scan:string("#foo{a=A} = {foo, 0}, A."),
  {ok, Exprs      } = erl_parse:parse_exprs(Tokens),
  NewExprs          = erl_eval_records:expand(erl_eval_records:load(?MODULE), Exprs),
  {value, Value, _} = erl_eval:exprs(NewExprs, []),
  ?assertEqual(Value, 0).