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Import fixed upstream getopt.erl

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Tuncer Ayaz 2012-01-24 21:03:26 +01:00
parent 36b6b7a393
commit c4e40714ee
1 changed files with 166 additions and 129 deletions
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295
src/getopt.erl
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@ -81,26 +81,25 @@ parse(OptSpecList, CmdLine) ->
{ok, {[option()], [string()]}}. {ok, {[option()], [string()]}}.
%% Process the option terminator. %% Process the option terminator.
parse(OptSpecList, OptAcc, ArgAcc, _ArgPos, ["--" | Tail]) -> parse(OptSpecList, OptAcc, ArgAcc, _ArgPos, ["--" | Tail]) ->
% Any argument present after the terminator is not considered an option. %% Any argument present after the terminator is not considered an option.
{ok, {lists:reverse(append_default_options(OptSpecList, OptAcc)), lists:reverse(ArgAcc, Tail)}}; {ok, {lists:reverse(append_default_options(OptSpecList, OptAcc)), lists:reverse(ArgAcc, Tail)}};
%% Process long options. %% Process long options.
parse(OptSpecList, OptAcc, ArgAcc, ArgPos, ["--" ++ OptArg = OptStr | Tail]) -> parse(OptSpecList, OptAcc, ArgAcc, ArgPos, ["--" ++ OptArg = OptStr | Tail]) ->
parse_option_long(OptSpecList, OptAcc, ArgAcc, ArgPos, Tail, OptStr, OptArg); parse_long_option(OptSpecList, OptAcc, ArgAcc, ArgPos, Tail, OptStr, OptArg);
%% Process short options. %% Process short options.
parse(OptSpecList, OptAcc, ArgAcc, ArgPos, ["-" ++ ([_Char | _] = OptArg) = OptStr | Tail]) -> parse(OptSpecList, OptAcc, ArgAcc, ArgPos, ["-" ++ ([_Char | _] = OptArg) = OptStr | Tail]) ->
parse_option_short(OptSpecList, OptAcc, ArgAcc, ArgPos, Tail, OptStr, OptArg); parse_short_option(OptSpecList, OptAcc, ArgAcc, ArgPos, Tail, OptStr, OptArg);
%% Process non-option arguments. %% Process non-option arguments.
parse(OptSpecList, OptAcc, ArgAcc, ArgPos, [Arg | Tail]) -> parse(OptSpecList, OptAcc, ArgAcc, ArgPos, [Arg | Tail]) ->
case find_non_option_arg(OptSpecList, ArgPos) of case find_non_option_arg(OptSpecList, ArgPos) of
{value, OptSpec} when ?IS_OPT_SPEC(OptSpec) -> {value, OptSpec} when ?IS_OPT_SPEC(OptSpec) ->
parse(OptSpecList, add_option_arg(OptSpec, Arg, OptAcc), parse(OptSpecList, add_option_with_arg(OptSpec, Arg, OptAcc), ArgAcc, ArgPos + 1, Tail);
ArgAcc, ArgPos + 1, Tail);
false -> false ->
parse(OptSpecList, OptAcc, [Arg | ArgAcc], ArgPos, Tail) parse(OptSpecList, OptAcc, [Arg | ArgAcc], ArgPos, Tail)
end; end;
parse(OptSpecList, OptAcc, ArgAcc, _ArgPos, []) -> parse(OptSpecList, OptAcc, ArgAcc, _ArgPos, []) ->
% Once we have completed gathering the options we add the ones that were %% Once we have completed gathering the options we add the ones that were
% not present but had default arguments in the specification. %% not present but had default arguments in the specification.
{ok, {lists:reverse(append_default_options(OptSpecList, OptAcc)), lists:reverse(ArgAcc)}}. {ok, {lists:reverse(append_default_options(OptSpecList, OptAcc)), lists:reverse(ArgAcc)}}.
@ -110,14 +109,14 @@ parse(OptSpecList, OptAcc, ArgAcc, _ArgPos, []) ->
%% --foo Single option 'foo', no argument %% --foo Single option 'foo', no argument
%% --foo=bar Single option 'foo', argument "bar" %% --foo=bar Single option 'foo', argument "bar"
%% --foo bar Single option 'foo', argument "bar" %% --foo bar Single option 'foo', argument "bar"
-spec parse_option_long([option_spec()], [option()], [string()], integer(), [string()], string(), string()) -> -spec parse_long_option([option_spec()], [option()], [string()], integer(), [string()], string(), string()) ->
{ok, {[option()], [string()]}}. {ok, {[option()], [string()]}}.
parse_option_long(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, OptArg) -> parse_long_option(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, OptArg) ->
case split_assigned_arg(OptArg) of case split_assigned_arg(OptArg) of
{Long, Arg} -> {Long, Arg} ->
% Get option that has its argument within the same string %% Get option that has its argument within the same string
% separated by an equal ('=') character (e.g. "--port=1000"). %% separated by an equal ('=') character (e.g. "--port=1000").
parse_option_assigned_arg(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, Long, Arg); parse_long_option_assigned_arg(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, Long, Arg);
Long -> Long ->
case lists:keyfind(Long, ?OPT_LONG, OptSpecList) of case lists:keyfind(Long, ?OPT_LONG, OptSpecList) of
@ -125,9 +124,10 @@ parse_option_long(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, OptArg) ->
parse(OptSpecList, [Name | OptAcc], ArgAcc, ArgPos, Args); parse(OptSpecList, [Name | OptAcc], ArgAcc, ArgPos, Args);
{_Name, _Short, Long, _ArgSpec, _Help} = OptSpec -> {_Name, _Short, Long, _ArgSpec, _Help} = OptSpec ->
% The option argument string is empty, but the option requires %% The option argument string is empty, but the option requires
% an argument, so we look into the next string in the list. %% an argument, so we look into the next string in the list.
parse_option_next_arg(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptSpec); %% e.g ["--port", "1000"]
parse_long_option_next_arg(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptSpec);
false -> false ->
throw({error, {invalid_option, OptStr}}) throw({error, {invalid_option, OptStr}})
end end
@ -137,17 +137,17 @@ parse_option_long(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, OptArg) ->
%% @doc Parse an option where the argument is 'assigned' in the same string using %% @doc Parse an option where the argument is 'assigned' in the same string using
%% the '=' character, add it to the option accumulator and continue parsing the %% the '=' character, add it to the option accumulator and continue parsing the
%% rest of the arguments recursively. This syntax is only valid for long options. %% rest of the arguments recursively. This syntax is only valid for long options.
-spec parse_option_assigned_arg([option_spec()], [option()], [string()], integer(), -spec parse_long_option_assigned_arg([option_spec()], [option()], [string()], integer(),
[string()], string(), string(), string()) -> [string()], string(), string(), string()) ->
{ok, {[option()], [string()]}}. {ok, {[option()], [string()]}}.
parse_option_assigned_arg(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, Long, Arg) -> parse_long_option_assigned_arg(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, Long, Arg) ->
case lists:keyfind(Long, ?OPT_LONG, OptSpecList) of case lists:keyfind(Long, ?OPT_LONG, OptSpecList) of
{_Name, _Short, Long, ArgSpec, _Help} = OptSpec -> {_Name, _Short, Long, ArgSpec, _Help} = OptSpec ->
case ArgSpec of case ArgSpec of
undefined -> undefined ->
throw({error, {invalid_option_arg, OptStr}}); throw({error, {invalid_option_arg, OptStr}});
_ -> _ ->
parse(OptSpecList, add_option_arg(OptSpec, Arg, OptAcc), ArgAcc, ArgPos, Args) parse(OptSpecList, add_option_with_assigned_arg(OptSpec, Arg, OptAcc), ArgAcc, ArgPos, Args)
end; end;
false -> false ->
throw({error, {invalid_option, OptStr}}) throw({error, {invalid_option, OptStr}})
@ -168,6 +168,25 @@ split_assigned_arg(OptStr, [], _Acc) ->
OptStr. OptStr.
%% @doc Retrieve the argument for an option from the next string in the list of
%% command-line parameters or set the value of the argument from the argument
%% specification (for boolean and integer arguments), if possible.
parse_long_option_next_arg(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, {Name, _Short, _Long, ArgSpec, _Help} = OptSpec) ->
ArgSpecType = arg_spec_type(ArgSpec),
case Args =:= [] orelse is_implicit_arg(ArgSpecType, hd(Args)) of
true ->
parse(OptSpecList, add_option_with_implicit_arg(OptSpec, OptAcc), ArgAcc, ArgPos, Args);
false ->
[Arg | Tail] = Args,
try
parse(OptSpecList, [{Name, to_type(ArgSpecType, Arg)} | OptAcc], ArgAcc, ArgPos, Tail)
catch
error:_ ->
throw({error, {invalid_option_arg, {Name, Arg}}})
end
end.
%% @doc Parse a short option, add it to the option accumulator and continue %% @doc Parse a short option, add it to the option accumulator and continue
%% parsing the rest of the arguments recursively. %% parsing the rest of the arguments recursively.
%% A short option can have the following syntax: %% A short option can have the following syntax:
@ -177,71 +196,62 @@ split_assigned_arg(OptStr, [], _Acc) ->
%% -abc Multiple options: 'a'; 'b'; 'c' %% -abc Multiple options: 'a'; 'b'; 'c'
%% -bcafoo Multiple options: 'b'; 'c'; 'a' with argument "foo" %% -bcafoo Multiple options: 'b'; 'c'; 'a' with argument "foo"
%% -aaa Multiple repetitions of option 'a' (only valid for options with integer arguments) %% -aaa Multiple repetitions of option 'a' (only valid for options with integer arguments)
-spec parse_option_short([option_spec()], [option()], [string()], integer(), [string()], string(), string()) -> -spec parse_short_option([option_spec()], [option()], [string()], integer(), [string()], string(), string()) ->
{ok, {[option()], [string()]}}. {ok, {[option()], [string()]}}.
parse_option_short(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, [Short | Arg]) -> parse_short_option(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, OptArg) ->
parse_short_option(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, first, OptArg).
parse_short_option(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, OptPos, [Short | Arg]) ->
case lists:keyfind(Short, ?OPT_SHORT, OptSpecList) of case lists:keyfind(Short, ?OPT_SHORT, OptSpecList) of
{Name, Short, _Long, undefined, _Help} -> {Name, Short, _Long, undefined, _Help} ->
parse_option_short(OptSpecList, [Name | OptAcc], ArgAcc, ArgPos, Args, OptStr, Arg); parse_short_option(OptSpecList, [Name | OptAcc], ArgAcc, ArgPos, Args, OptStr, first, Arg);
{_Name, Short, _Long, ArgSpec, _Help} = OptSpec -> {_Name, Short, _Long, ArgSpec, _Help} = OptSpec ->
%% The option has a specification, so it requires an argument.
case Arg of case Arg of
[] -> [] ->
%% The option argument string is empty, but the option requires %% The option argument string is empty, but the option requires
%% an argument, so we look into the next string in the list. %% an argument, so we look into the next string in the list.
parse_option_next_arg(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptSpec); parse_short_option_next_arg(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptSpec, OptPos);
_ -> _ ->
case is_valid_arg(ArgSpec, Arg) of case is_valid_arg(ArgSpec, Arg) of
true -> true ->
parse(OptSpecList, add_option_arg(OptSpec, Arg, OptAcc), ArgAcc, ArgPos, Args); parse(OptSpecList, add_option_with_arg(OptSpec, Arg, OptAcc), ArgAcc, ArgPos, Args);
_ -> _ ->
%% There are 2 valid cases in which we may not receive the expected argument: NewOptAcc = case OptPos of
%% 1) When the expected argument is a boolean: in this case the presence first -> add_option_with_implicit_arg(OptSpec, OptAcc);
%% of the option makes the argument true. _ -> add_option_with_implicit_incrementable_arg(OptSpec, OptAcc)
%% 2) When the expected argument is an integer: in this case the presence end,
%% of the option sets the value to 1 and any additional appearances of parse_short_option(OptSpecList, NewOptAcc, ArgAcc, ArgPos, Args, OptStr, next, Arg)
%% the option increment it by 1 (e.g. "-vvv" would return {verbose, 3}).
parse_option_short(OptSpecList, add_option_no_arg(OptSpec, OptAcc), ArgAcc, ArgPos, Args, OptStr, Arg)
end end
end; end;
false -> false ->
throw({error, {invalid_option, OptStr}}) throw({error, {invalid_option, OptStr}})
end; end;
parse_option_short(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, _OptStr, []) -> parse_short_option(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, _OptStr, _OptPos, []) ->
parse(OptSpecList, OptAcc, ArgAcc, ArgPos, Args). parse(OptSpecList, OptAcc, ArgAcc, ArgPos, Args).
%% @doc Retrieve the argument for an option from the next string in the list of %% @doc Retrieve the argument for an option from the next string in the list of
%% command-line parameters or set the value of the argument from the argument %% command-line parameters or set the value of the argument from the argument
%% specification (for boolean and integer arguments), if possible. %% specification (for boolean and integer arguments), if possible.
parse_option_next_arg(OptSpecList, OptAcc, ArgAcc, ArgPos, [Arg | Tail] = Args, {Name, _Short, _Long, ArgSpec, _Help} = OptSpec) -> parse_short_option_next_arg(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, {Name, _Short, _Long, ArgSpec, _Help} = OptSpec, OptPos) ->
ArgSpecType = arg_spec_type(ArgSpec), case Args =:= [] orelse is_implicit_arg(ArgSpec, hd(Args)) of
case (ArgSpecType =:= boolean) andalso not is_boolean_arg(Arg) of true when OptPos =:= first ->
parse(OptSpecList, add_option_with_implicit_arg(OptSpec, OptAcc), ArgAcc, ArgPos, Args);
true -> true ->
%% Special case for booleans: when the next string is not a boolean parse(OptSpecList, add_option_with_implicit_incrementable_arg(OptSpec, OptAcc), ArgAcc, ArgPos, Args);
%% argument we assume the value is 'true'.
parse(OptSpecList, add_arg(OptSpec, true, OptAcc), ArgAcc, ArgPos, Args);
false -> false ->
case (ArgSpecType =:= integer) andalso not is_integer_arg(Arg) of [Arg | Tail] = Args,
true -> try
%% Special case for integer arguments: if the option had not been set parse(OptSpecList, [{Name, to_type(ArgSpec, Arg)} | OptAcc], ArgAcc, ArgPos, Tail)
%% before we set the value to 1; if not we increment the previous value catch
%% the option had. This is needed to support options like "-vvv" to error:_ ->
%% return something like {verbose, 3}. throw({error, {invalid_option_arg, {Name, Arg}}})
parse(OptSpecList, add_implicit_integer_arg(OptSpec, OptAcc), ArgAcc, ArgPos, Args);
false ->
try
parse(OptSpecList, add_arg(OptSpec, to_type(ArgSpecType, Arg), OptAcc), ArgAcc, ArgPos, Tail)
catch
error:_ ->
throw({error, {invalid_option_arg, {Name, Arg}}})
end
end end
end; end.
parse_option_next_arg(OptSpecList, OptAcc, ArgAcc, ArgPos, [] = Args, OptSpec) ->
parse(OptSpecList, add_option_no_arg(OptSpec, OptAcc), ArgAcc, ArgPos, Args).
%% @doc Find the option for the discrete argument in position specified in the %% @doc Find the option for the discrete argument in position specified in the
@ -275,72 +285,79 @@ append_default_options([], OptAcc) ->
OptAcc. OptAcc.
%% @doc Add an option with no argument. %% @doc Add an option with argument converting it to the data type indicated by the
-spec add_option_no_arg(option_spec(), [option()]) -> [option()]. %% argument specification.
add_option_no_arg({Name, _Short, _Long, ArgSpec, _Help} = OptSpec, OptAcc) -> -spec add_option_with_arg(option_spec(), string(), [option()]) -> [option()].
add_option_with_arg({Name, _Short, _Long, ArgSpec, _Help} = OptSpec, Arg, OptAcc) ->
case is_valid_arg(ArgSpec, Arg) of
true ->
try
[{Name, to_type(ArgSpec, Arg)} | OptAcc]
catch
error:_ ->
throw({error, {invalid_option_arg, {Name, Arg}}})
end;
false ->
add_option_with_implicit_arg(OptSpec, OptAcc)
end.
%% @doc Add an option with argument that was part of an assignment expression
%% (e.g. "--verbose=3") converting it to the data type indicated by the
%% argument specification.
-spec add_option_with_assigned_arg(option_spec(), string(), [option()]) -> [option()].
add_option_with_assigned_arg({Name, _Short, _Long, ArgSpec, _Help}, Arg, OptAcc) ->
try
[{Name, to_type(ArgSpec, Arg)} | OptAcc]
catch
error:_ ->
throw({error, {invalid_option_arg, {Name, Arg}}})
end.
%% @doc Add an option that required an argument but did not have one. Some data
%% types (boolean, integer) allow implicit or assumed arguments.
-spec add_option_with_implicit_arg(option_spec(), [option()]) -> [option()].
add_option_with_implicit_arg({Name, _Short, _Long, ArgSpec, _Help}, OptAcc) ->
case arg_spec_type(ArgSpec) of case arg_spec_type(ArgSpec) of
boolean -> boolean ->
%% Special case for boolean arguments: if there is no argument we %% Special case for boolean arguments: if there is no argument we
%% set the value to 'true'. %% set the value to 'true'.
add_arg(OptSpec, true, OptAcc); [{Name, true} | OptAcc];
integer -> integer ->
%% Special case for integer arguments: if the option had not been set %% Special case for integer arguments: if the option had not been set
%% before we set the value to 1; if not we increment the previous value %% before we set the value to 1. This is needed to support options like
%% the option had. This is needed to support options like "-vvv" to %% "-v" to return something like {verbose, 1}.
%% return something like {verbose, 3}. [{Name, 1} | OptAcc];
add_implicit_integer_arg(OptSpec, OptAcc);
_ -> _ ->
throw({error, {missing_option_arg, Name}}) throw({error, {missing_option_arg, Name}})
end. end.
%% @doc Add an option with argument converting it to the data type indicated by the %% @doc Add an option with an implicit or assumed argument.
%% argument specification. -spec add_option_with_implicit_incrementable_arg(option_spec() | arg_spec(), [option()]) -> [option()].
-spec add_option_arg(option_spec(), string(), [option()]) -> [option()]. add_option_with_implicit_incrementable_arg({Name, _Short, _Long, ArgSpec, _Help}, OptAcc) ->
add_option_arg({Name, _Short, _Long, ArgSpec, _Help} = OptSpec, Arg, OptAcc) -> case arg_spec_type(ArgSpec) of
ArgSpecType = arg_spec_type(ArgSpec), boolean ->
case (ArgSpecType =:= boolean) andalso not is_boolean_arg(Arg) of %% Special case for boolean arguments: if there is no argument we
true -> %% set the value to 'true'.
%% Special case for booleans: when the next string is not a boolean [{Name, true} | OptAcc];
%% argument we assume the value is 'true'. integer ->
add_arg(OptSpec, true, OptAcc); %% Special case for integer arguments: if the option had not been set
false -> %% before we set the value to 1; if not we increment the previous value
case (ArgSpecType =:= integer) andalso not is_integer_arg(Arg) of %% the option had. This is needed to support options like "-vvv" to
true -> %% return something like {verbose, 3}.
%% Special case for integer arguments: if the option had not been set case OptAcc of
%% before we set the value to 1; if not we increment the previous value [{Name, Count} | Tail] ->
%% the option had. This is needed to support options like "-vvv" to [{Name, Count + 1} | Tail];
%% return something like {verbose, 3}. _ ->
add_implicit_integer_arg(OptSpec, OptAcc); [{Name, 1} | OptAcc]
false -> end;
try _ ->
add_arg(OptSpec, to_type(ArgSpecType, Arg), OptAcc) throw({error, {missing_option_arg, Name}})
catch
error:_ ->
throw({error, {invalid_option_arg, {Name, Arg}}})
end
end
end. end.
%% Add an option with an integer argument.
-spec add_implicit_integer_arg(option_spec(), [option()]) -> [option()].
add_implicit_integer_arg({Name, _Short, _Long, _ArgSpec, _Help}, OptAcc) ->
case lists:keyfind(Name, 1, OptAcc) of
{Name, Count} ->
lists:keyreplace(Name, 1, OptAcc, {Name, Count + 1});
false ->
[{Name, 1} | OptAcc]
end.
%% @doc Add an option with an argument and convert it to the data type corresponding
%% to the argument specification.
-spec add_arg(option_spec(), arg_value(), [option()]) -> [option()].
add_arg({Name, _Short, _Long, _ArgSpec, _Help}, Arg, OptAcc) ->
[{Name, Arg} | lists:keydelete(Name, 1, OptAcc)].
%% @doc Retrieve the data type form an argument specification. %% @doc Retrieve the data type form an argument specification.
-spec arg_spec_type(arg_spec()) -> arg_type() | undefined. -spec arg_spec_type(arg_spec()) -> arg_type() | undefined.
arg_spec_type({Type, _DefaultArg}) -> arg_spec_type({Type, _DefaultArg}) ->
@ -350,7 +367,9 @@ arg_spec_type(Type) when is_atom(Type) ->
%% @doc Convert an argument string to its corresponding data type. %% @doc Convert an argument string to its corresponding data type.
-spec to_type(arg_type(), string()) -> arg_value(). -spec to_type(arg_spec() | arg_type(), string()) -> arg_value().
to_type({Type, _DefaultArg}, Arg) ->
to_type(Type, Arg);
to_type(binary, Arg) -> to_type(binary, Arg) ->
list_to_binary(Arg); list_to_binary(Arg);
to_type(atom, Arg) -> to_type(atom, Arg) ->
@ -398,13 +417,24 @@ is_valid_arg({Type, _DefaultArg}, Arg) ->
is_valid_arg(boolean, Arg) -> is_valid_arg(boolean, Arg) ->
is_boolean_arg(Arg); is_boolean_arg(Arg);
is_valid_arg(integer, Arg) -> is_valid_arg(integer, Arg) ->
is_integer_arg(Arg); is_non_neg_integer_arg(Arg);
is_valid_arg(float, Arg) -> is_valid_arg(float, Arg) ->
is_float_arg(Arg); is_non_neg_float_arg(Arg);
is_valid_arg(_Type, _Arg) -> is_valid_arg(_Type, _Arg) ->
true. true.
-spec is_implicit_arg(arg_spec(), nonempty_string()) -> boolean().
is_implicit_arg({Type, _DefaultArg}, Arg) ->
is_implicit_arg(Type, Arg);
is_implicit_arg(boolean, Arg) ->
not is_boolean_arg(Arg);
is_implicit_arg(integer, Arg) ->
not is_integer_arg(Arg);
is_implicit_arg(_Type, _Arg) ->
false.
-spec is_boolean_arg(string()) -> boolean(). -spec is_boolean_arg(string()) -> boolean().
is_boolean_arg(Arg) -> is_boolean_arg(Arg) ->
LowerArg = string:to_lower(Arg), LowerArg = string:to_lower(Arg),
@ -412,20 +442,27 @@ is_boolean_arg(Arg) ->
-spec is_integer_arg(string()) -> boolean(). -spec is_integer_arg(string()) -> boolean().
is_integer_arg([Head | Tail]) when Head >= $0, Head =< $9 -> is_integer_arg([$- | Tail]) ->
is_integer_arg(Tail); is_non_neg_integer_arg(Tail);
is_integer_arg([_Head | _Tail]) -> is_integer_arg(Arg) ->
is_non_neg_integer_arg(Arg).
-spec is_non_neg_integer_arg(string()) -> boolean().
is_non_neg_integer_arg([Head | Tail]) when Head >= $0, Head =< $9 ->
is_non_neg_integer_arg(Tail);
is_non_neg_integer_arg([_Head | _Tail]) ->
false; false;
is_integer_arg([]) -> is_non_neg_integer_arg([]) ->
true. true.
-spec is_float_arg(string()) -> boolean(). -spec is_non_neg_float_arg(string()) -> boolean().
is_float_arg([Head | Tail]) when (Head >= $0 andalso Head =< $9) orelse Head =:= $. -> is_non_neg_float_arg([Head | Tail]) when (Head >= $0 andalso Head =< $9) orelse Head =:= $. ->
is_float_arg(Tail); is_non_neg_float_arg(Tail);
is_float_arg([_Head | _Tail]) -> is_non_neg_float_arg([_Head | _Tail]) ->
false; false;
is_float_arg([]) -> is_non_neg_float_arg([]) ->
true. true.
@ -490,10 +527,10 @@ usage_cmd_line([{Name, Short, Long, ArgSpec, _Help} | Tail], Acc) ->
case ArgSpec of case ArgSpec of
undefined -> undefined ->
if if
% For options with short form and no argument. %% For options with short form and no argument.
Short =/= undefined -> Short =/= undefined ->
[$\s, $[, $-, Short, $]]; [$\s, $[, $-, Short, $]];
% For options with only long form and no argument. %% For options with only long form and no argument.
Long =/= undefined -> Long =/= undefined ->
[$\s, $[, $-, $-, Long, $]]; [$\s, $[, $-, $-, Long, $]];
true -> true ->
@ -501,13 +538,13 @@ usage_cmd_line([{Name, Short, Long, ArgSpec, _Help} | Tail], Acc) ->
end; end;
_ -> _ ->
if if
% For options with short form and argument. %% For options with short form and argument.
Short =/= undefined -> Short =/= undefined ->
[$\s, $[, $-, Short, $\s, $<, atom_to_list(Name), $>, $]]; [$\s, $[, $-, Short, $\s, $<, atom_to_list(Name), $>, $]];
% For options with only long form and argument. %% For options with only long form and argument.
Long =/= undefined -> Long =/= undefined ->
[$\s, $[, $-, $-, Long, $\s, $<, atom_to_list(Name), $>, $]]; [$\s, $[, $-, $-, Long, $\s, $<, atom_to_list(Name), $>, $]];
% For options with neither short nor long form and argument. %% For options with neither short nor long form and argument.
true -> true ->
[$\s, $<, atom_to_list(Name), $>] [$\s, $<, atom_to_list(Name), $>]
end end
@ -528,19 +565,19 @@ usage_options_reverse([{Name, Short, Long, _ArgSpec, Help} | Tail], Acc) ->
case Long of case Long of
undefined -> undefined ->
case Short of case Short of
% Neither short nor long form (non-option argument). %% Neither short nor long form (non-option argument).
undefined -> undefined ->
[$<, atom_to_list(Name), $>]; [$<, atom_to_list(Name), $>];
% Only short form. %% Only short form.
_ -> _ ->
[$-, Short] [$-, Short]
end; end;
_ -> _ ->
case Short of case Short of
% Only long form. %% Only long form.
undefined -> undefined ->
[$-, $- | Long]; [$-, $- | Long];
% Both short and long form. %% Both short and long form.
_ -> _ ->
[$-, Short, $,, $\s, $-, $- | Long] [$-, Short, $,, $\s, $-, $- | Long]
end end