224 lines
8.7 KiB
Erlang
224 lines
8.7 KiB
Erlang
-module(elixir_bitstring).
|
|
-export([translate/3, expand/3, has_size/1]).
|
|
-include("elixir.hrl").
|
|
|
|
%% Expansion
|
|
|
|
expand(Meta, Args, E) ->
|
|
case E#elixir_env.context of
|
|
match ->
|
|
{EArgs, EA} = expand_bitstr(fun elixir_exp:expand/2, Args, [], E),
|
|
{{'<<>>', Meta, EArgs}, EA};
|
|
_ ->
|
|
{EArgs, {EC, EV}} = expand_bitstr(fun elixir_exp:expand_arg/2, Args, [], {E, E}),
|
|
{{'<<>>', Meta, EArgs}, elixir_env:mergea(EV, EC)}
|
|
end.
|
|
|
|
expand_bitstr(_Fun, [], Acc, E) ->
|
|
{lists:reverse(Acc), E};
|
|
expand_bitstr(Fun, [{'::',Meta,[Left,Right]}|T], Acc, E) ->
|
|
{ELeft, EL} = Fun(Left, E),
|
|
|
|
%% Variables defined outside the binary can be accounted
|
|
%% on subparts, however we can't assign new variables.
|
|
case E of
|
|
{ER, _} -> ok; %% expand_arg, no assigns
|
|
_ -> ER = E#elixir_env{context=nil} %% expand_each, revert assigns
|
|
end,
|
|
|
|
ERight = expand_bit_info(Meta, Right, ER),
|
|
expand_bitstr(Fun, T, [{'::',Meta,[ELeft,ERight]}|Acc], EL);
|
|
|
|
expand_bitstr(Fun, [H|T], Acc, E) ->
|
|
{Expr, ES} = Fun(H, E),
|
|
expand_bitstr(Fun, T, [Expr|Acc], ES).
|
|
|
|
%% Expand bit info
|
|
|
|
expand_bit_info(Meta, Info, E) when is_list(Info) ->
|
|
expand_bit_info(Meta, Info, default, [], E);
|
|
|
|
expand_bit_info(Meta, Info, E) ->
|
|
expand_bit_info(Meta, [Info], E).
|
|
|
|
expand_bit_info(Meta, [{Expr, ExprMeta, Args}|T], Size, Types, E) when is_atom(Expr) ->
|
|
ListArgs = if is_atom(Args) -> []; is_list(Args) -> Args end,
|
|
case expand_bit_type_or_size(Expr, ListArgs) of
|
|
type ->
|
|
{EArgs, EE} = elixir_exp:expand_args(ListArgs, E),
|
|
expand_bit_info(Meta, T, Size, [{Expr, [], EArgs}|Types], EE);
|
|
size ->
|
|
case Size of
|
|
default -> ok;
|
|
_ -> elixir_errors:compile_error(Meta, E#elixir_env.file, "duplicated size definition in bitstring")
|
|
end,
|
|
{EArgs, EE} = elixir_exp:expand_args(ListArgs, E),
|
|
expand_bit_info(Meta, T, {Expr, [], EArgs}, Types, EE);
|
|
none ->
|
|
handle_unknown_bit_info(Meta, {Expr, ExprMeta, ListArgs}, T, Size, Types, E)
|
|
end;
|
|
|
|
expand_bit_info(Meta, [Int|T], Size, Types, E) when is_integer(Int) ->
|
|
expand_bit_info(Meta, [{size, [], [Int]}|T], Size, Types, E);
|
|
|
|
expand_bit_info(Meta, [Expr|_], _Size, _Types, E) ->
|
|
elixir_errors:compile_error(Meta, E#elixir_env.file,
|
|
"unknown bitstring specifier ~ts", ['Elixir.Kernel':inspect(Expr)]);
|
|
|
|
expand_bit_info(_Meta, [], Size, Types, _) ->
|
|
case Size of
|
|
default -> lists:reverse(Types);
|
|
_ -> [Size|lists:reverse(Types)]
|
|
end.
|
|
|
|
expand_bit_type_or_size(binary, []) -> type;
|
|
expand_bit_type_or_size(integer, []) -> type;
|
|
expand_bit_type_or_size(float, []) -> type;
|
|
expand_bit_type_or_size(bitstring, []) -> type;
|
|
expand_bit_type_or_size(bytes, []) -> type;
|
|
expand_bit_type_or_size(bits, []) -> type;
|
|
expand_bit_type_or_size(utf8, []) -> type;
|
|
expand_bit_type_or_size(utf16, []) -> type;
|
|
expand_bit_type_or_size(utf32, []) -> type;
|
|
expand_bit_type_or_size(signed, []) -> type;
|
|
expand_bit_type_or_size(unsigned, []) -> type;
|
|
expand_bit_type_or_size(big, []) -> type;
|
|
expand_bit_type_or_size(little, []) -> type;
|
|
expand_bit_type_or_size(native, []) -> type;
|
|
expand_bit_type_or_size(unit, [_]) -> type;
|
|
expand_bit_type_or_size(size, [_]) -> size;
|
|
expand_bit_type_or_size(_, _) -> none.
|
|
|
|
handle_unknown_bit_info(Meta, {_, ExprMeta, _} = Expr, T, Size, Types, E) ->
|
|
case 'Elixir.Macro':expand(Expr, elixir_env:env_to_ex({?line(ExprMeta), E})) of
|
|
Expr ->
|
|
elixir_errors:compile_error(ExprMeta, E#elixir_env.file,
|
|
"unknown bitstring specifier ~ts", ['Elixir.Macro':to_string(Expr)]);
|
|
Other ->
|
|
List = case is_list(Other) of true -> Other; false -> [Other] end,
|
|
expand_bit_info(Meta, List ++ T, Size, Types, E)
|
|
end.
|
|
|
|
%% Translation
|
|
|
|
has_size({bin, _, Elements}) ->
|
|
not lists:any(fun({bin_element, _Line, _Expr, Size, Types}) ->
|
|
(Types /= default) andalso (Size == default) andalso
|
|
lists:any(fun(X) -> lists:member(X, Types) end,
|
|
[bits, bytes, bitstring, binary])
|
|
end, Elements).
|
|
|
|
translate(Meta, Args, S) ->
|
|
case S#elixir_scope.context of
|
|
match ->
|
|
build_bitstr(fun elixir_translator:translate/2, Args, Meta, S);
|
|
_ ->
|
|
build_bitstr(fun(X, Acc) -> elixir_translator:translate_arg(X, Acc, S) end, Args, Meta, S)
|
|
end.
|
|
|
|
build_bitstr(Fun, Exprs, Meta, S) ->
|
|
{Final, FinalS} = build_bitstr_each(Fun, Exprs, Meta, S, []),
|
|
{{bin, ?line(Meta), lists:reverse(Final)}, FinalS}.
|
|
|
|
build_bitstr_each(_Fun, [], _Meta, S, Acc) ->
|
|
{Acc, S};
|
|
|
|
build_bitstr_each(Fun, [{'::',_,[H,V]}|T], Meta, S, Acc) ->
|
|
{Size, Types} = extract_bit_info(Meta, V, S#elixir_scope{context=nil}),
|
|
build_bitstr_each(Fun, T, Meta, S, Acc, H, Size, Types);
|
|
|
|
build_bitstr_each(Fun, [H|T], Meta, S, Acc) ->
|
|
build_bitstr_each(Fun, T, Meta, S, Acc, H, default, default).
|
|
|
|
build_bitstr_each(Fun, T, Meta, S, Acc, H, default, Types) when is_binary(H) ->
|
|
Element =
|
|
case types_allow_splice(Types, []) of
|
|
true ->
|
|
%% See explanation in elixir_utils:elixir_to_erl/1 to know
|
|
%% why we can simply convert the binary to a list.
|
|
{bin_element, ?line(Meta), {string, 0, binary_to_list(H)}, default, default};
|
|
false ->
|
|
case types_require_conversion(Types) of
|
|
true ->
|
|
{bin_element, ?line(Meta), {string, 0, elixir_utils:characters_to_list(H)}, default, Types};
|
|
false ->
|
|
elixir_errors:compile_error(Meta, S#elixir_scope.file, "invalid types for literal string in <<>>. "
|
|
"Accepted types are: little, big, utf8, utf16, utf32, bits, bytes, binary, bitstring")
|
|
end
|
|
end,
|
|
|
|
build_bitstr_each(Fun, T, Meta, S, [Element|Acc]);
|
|
|
|
build_bitstr_each(_Fun, _T, Meta, S, _Acc, H, _Size, _Types) when is_binary(H) ->
|
|
elixir_errors:compile_error(Meta, S#elixir_scope.file, "size is not supported for literal string in <<>>");
|
|
|
|
build_bitstr_each(_Fun, _T, Meta, S, _Acc, H, _Size, _Types) when is_list(H); is_atom(H) ->
|
|
elixir_errors:compile_error(Meta, S#elixir_scope.file, "invalid literal ~ts in <<>>",
|
|
['Elixir.Macro':to_string(H)]);
|
|
|
|
build_bitstr_each(Fun, T, Meta, S, Acc, H, Size, Types) ->
|
|
{Expr, NS} = Fun(H, S),
|
|
|
|
case Expr of
|
|
{bin, _, Elements} ->
|
|
case (Size == default) andalso types_allow_splice(Types, Elements) of
|
|
true -> build_bitstr_each(Fun, T, Meta, NS, lists:reverse(Elements) ++ Acc);
|
|
false -> build_bitstr_each(Fun, T, Meta, NS, [{bin_element, ?line(Meta), Expr, Size, Types}|Acc])
|
|
end;
|
|
_ ->
|
|
build_bitstr_each(Fun, T, Meta, NS, [{bin_element, ?line(Meta), Expr, Size, Types}|Acc])
|
|
end.
|
|
|
|
types_require_conversion([End|T]) when End == little; End == big -> types_require_conversion(T);
|
|
types_require_conversion([UTF|T]) when UTF == utf8; UTF == utf16; UTF == utf32 -> types_require_conversion(T);
|
|
types_require_conversion([]) -> true;
|
|
types_require_conversion(_) -> false.
|
|
|
|
types_allow_splice([bytes], Elements) -> is_byte_size(Elements, 0);
|
|
types_allow_splice([binary], Elements) -> is_byte_size(Elements, 0);
|
|
types_allow_splice([bits], _) -> true;
|
|
types_allow_splice([bitstring], _) -> true;
|
|
types_allow_splice(default, _) -> true;
|
|
types_allow_splice(_, _) -> false.
|
|
|
|
is_byte_size([Element|T], Acc) ->
|
|
case elem_size(Element) of
|
|
{unknown, Unit} when Unit rem 8 == 0 -> is_byte_size(T, Acc);
|
|
{unknown, _Unit} -> false;
|
|
{Size, Unit} -> is_byte_size(T, Size*Unit + Acc)
|
|
end;
|
|
is_byte_size([], Size) ->
|
|
Size rem 8 == 0.
|
|
|
|
elem_size({bin_element, _, _, default, _}) -> {0, 0};
|
|
elem_size({bin_element, _, _, {integer,_,Size}, Types}) -> {Size, unit_size(Types, 1)};
|
|
elem_size({bin_element, _, _, _Size, Types}) -> {unknown, unit_size(Types, 1)}.
|
|
|
|
unit_size([binary|T], _) -> unit_size(T, 8);
|
|
unit_size([{unit, Size}|_], _) -> Size;
|
|
unit_size([_|T], Guess) -> unit_size(T, Guess);
|
|
unit_size([], Guess) -> Guess.
|
|
|
|
%% Extra bitstring specifiers
|
|
|
|
extract_bit_info(Meta, [{size, _, [Arg]}|T], S) ->
|
|
case elixir_translator:translate(Arg, S) of
|
|
{{Kind, _, _} = Size, _} when Kind == integer; Kind == var ->
|
|
{Size, extract_bit_type(Meta, T, S)};
|
|
_ ->
|
|
elixir_errors:compile_error(Meta, S#elixir_scope.file,
|
|
"size in bitstring expects an integer or a variable as argument, got: ~ts", ['Elixir.Macro':to_string(Arg)])
|
|
end;
|
|
extract_bit_info(Meta, T, S) ->
|
|
{default, extract_bit_type(Meta, T, S)}.
|
|
|
|
extract_bit_type(Meta, [{unit, _, [Arg]}|T], S) when is_integer(Arg) ->
|
|
[{unit, Arg}|extract_bit_type(Meta, T, S)];
|
|
extract_bit_type(Meta, [{unit, _, [Arg]}|_], S) ->
|
|
elixir_errors:compile_error(Meta, S#elixir_scope.file,
|
|
"unit in bitstring expects an integer as argument, got: ~ts", ['Elixir.Macro':to_string(Arg)]);
|
|
extract_bit_type(Meta, [{Other, _, []}|T], S) ->
|
|
[Other|extract_bit_type(Meta, T, S)];
|
|
extract_bit_type(_Meta, [], _S) ->
|
|
[].
|