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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Function-frequency/Erlang/function-frequency.erl Normal file
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-module( function_frequency ).
-export( [erlang_source/1, task/0] ).
erlang_source( File ) ->
{ok, IO} = file:open( File, [read] ),
Forms = parse_all( IO, io:parse_erl_form(IO, ''), [] ),
Functions = lists:flatten( [erl_syntax_lib:fold(fun accumulate_functions/2, [], X) || X <- Forms] ),
dict:to_list( lists:foldl(fun count/2, dict:new(), Functions) ).
task() ->
Function_frequencies = erlang_source( "function_frequency.erl" ),
{Top_tens, _Rest} = lists:split( 10, lists:reverse(lists:keysort(2, Function_frequencies)) ),
[io:fwrite("Function ~p called ~p times.~n", [X, Y]) || {X, Y} <- Top_tens].
accumulate_functions( Tree, Acc ) -> accumulate_functions( erlang:element(1, Tree), Tree, Acc ).
accumulate_functions( call, Tree, Acc ) -> [accumulate_functions_name(Tree) | Acc];
accumulate_functions( _Other, _Tree, Acc ) -> Acc.
accumulate_functions_name( Tree ) -> accumulate_functions_name_scoop( erlang:element(3, Tree) ).
accumulate_functions_name_scoop( {atom, _Line, Name} ) -> Name;
accumulate_functions_name_scoop( {remote, _Line, {atom, _Line, Module}, {atom, _Line, Name}} ) -> {Module, Name}.
count( Key, Dict ) -> dict:update_counter( Key, 1, Dict ).
parse_all( _IO, {eof, _End}, Acc ) -> Acc;
parse_all( IO, {ok, Tokens, Location}, Acc ) -> parse_all( IO, io:parse_erl_form(IO, '', Location), [Tokens | Acc] ).