Bubble Sort in Erlang

Welcome to the Bubble Sort in Erlang page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

-module(bubble_sort).
-export([main/1]).

%% Run with: escript bubble_sort.erl <INPUT>

usage() ->
    io:format("Usage: please provide a list of at least two integers to sort in the format \"1, 2, 3, 4, 5\"~n"),
    halt().

convert_list_to_integers(Str) ->
    Values = string:tokens(Str, ","),
    NumCommas = count_commas(Str),
    NumValues = length(Values),
    if
        (NumCommas + 1) == NumValues ->
            convert_values(Values);
        true ->
            {error, []}
    end.

count_commas([]) ->
    0;
count_commas([$, | Rest]) ->
    1 + count_commas(Rest);
count_commas([_ | Rest]) ->
    count_commas(Rest).

convert_values([]) ->
    {ok, []};
convert_values([ValueStr | Rest]) ->
    case convert_to_integer(ValueStr) of
        {ok, Value} ->
            case convert_values(Rest) of
                {ok, RestValues} ->
                    {ok, [Value | RestValues]};
                _ ->
                    {error, []}
            end;
        _ ->
            {error, []}
    end.

convert_to_integer(Str) ->
    Result = catch string:to_integer(string:strip(Str)),
    case Result of
        {Int, Rest} when Rest == "" ->
            {ok, Int};
        _ ->
            {error, 0}
    end.

bubble_sort(List) -> bubble_sort(List, [], false).

bubble_sort([A, B | T], Acc, _) when A > B ->
    bubble_sort([A | T], [B | Acc], true);
bubble_sort([A, B | T], Acc, Tainted) ->
    bubble_sort([B | T], [A | Acc], Tainted);
bubble_sort([A | T], Acc, Tainted) ->
    bubble_sort(T, [A | Acc], Tainted);
bubble_sort([], Acc, true) ->
    bubble_sort(lists:reverse(Acc));
bubble_sort([], Acc, false) ->
    lists:reverse(Acc).


handle_output([Num]) ->
    io:format("~p~n", [Num]);
handle_output([Num|NumList]) ->
    io:format("~p, ", [Num]),
    handle_output(NumList).

main(Args) ->
    if
        length(Args) < 1 ->
            usage();
        true ->
            ok
    end,

    StrValue = lists:nth(1, Args),
    Values = case convert_list_to_integers(StrValue) of
        {ok, Result} ->
            Result;
        _ ->
            usage()
    end,

    if
        length(Values) < 2 ->
            usage();
        true ->
            ok
    end,

    SortedValues = bubble_sort(Values),
    handle_output(SortedValues).

Bubble Sort in Erlang was written by:

• Jacky Hui
• rzuckerm

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

No 'How to Run the Solution' section available. Please consider contributing.