Convert Core Erlang forms into Erlang source code string

Question

I have Core Erlang forms constructs with the cerl module. I wish to "decompile" it into an Erlang source code string.

I though I could do something like this:

Forms = erl_syntax:form_list(CoreForms),
erl_prettypr:format(Forms).

However erl_syntax:form_list/1 returns an empty list.

what is the c_erl module? which function are you using? With which parameters? — Pascal
– Pascal, Commented Aug 9, 2018 at 14:17
The module is named cerl, not c_erl. It is part of the compiler application. — RichardC
– RichardC, Commented Aug 9, 2018 at 15:11
@pdexter CoreForms is a cerl:cerl(), a module as Core Erlang AST. — lpil
– lpil, Commented Aug 10, 2018 at 14:14

RichardC · Accepted Answer · 2018-08-09 15:16:35Z

2

Core Erlang ASTs cannot be handled with the utilities in syntax_tools - those are for normal Erlang ASTs only. For Core Erlang there are two modules (undocumented) for prettyprinting: core_pp in the compiler application, similar to erl_pp in stdlib, and cerl_prettypr in the hipe application (under lib/hipe/cerl/) which is similar to erl_prettypr in syntax_tools.

answered Aug 9, 2018 at 15:16

RichardC

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3 Comments

lpil Over a year ago

core_pp:format/1 converts core Erlang to a core Erlang source string, but I am interested in building a regular Erlang source string.

pdexter Over a year ago

@lpil ah, so from core you want to print Erlang? That isn't trivially possible. You cannot 'simply' reconstruct the Erlang source from core.

lpil Over a year ago

As I feared. Thanks for confirming :)

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