-module(contract_violation).
-export([entry/1, beam_disasm_lines/2]).
%%-----------------------------------------------------------------------
-type lines() :: #{non_neg_integer() => {string(), non_neg_integer()}}.
entry(Bin) ->
I = 42,
case beam_disasm_lines(Bin, ':-)') of
#{I := Loc} -> {good, Loc};
_ -> bad
end.
-spec beam_disasm_lines(binary() | none, module()) -> lines().
beam_disasm_lines(none, _) -> #{};
beam_disasm_lines(<<NumLines:32, LineBin:NumLines/binary, FileBin/binary>>,
_Module) ->
Lines = binary_to_term(LineBin),
Files = binary_to_term(FileBin),
lines_collect_items(Lines, Files, #{}).
lines_collect_items([], _, Acc) -> Acc;
lines_collect_items([{FileNo, LineNo}|Rest], Files, Acc) ->
#{FileNo := File} = Files,
lines_collect_items(
Rest, Files, Acc#{map_size(Acc)+1 => {location, File, LineNo}}).
