483 lines
19 KiB
Erlang
483 lines
19 KiB
Erlang
% Holds the logic responsible for function definitions (def(p) and defmacro(p)).
|
|
-module(elixir_def).
|
|
-export([setup/1, reset_last/1, local_for/4,
|
|
take_definition/2, store_definition/5, store_definition/9,
|
|
fetch_definitions/2, format_error/1]).
|
|
-include("elixir.hrl").
|
|
-define(last_def, {elixir, last_def}).
|
|
|
|
setup(DataTables) ->
|
|
reset_last(DataTables),
|
|
ok.
|
|
|
|
reset_last({DataSet, _DataBag}) ->
|
|
ets:insert(DataSet, {?last_def, none});
|
|
|
|
reset_last(Module) when is_atom(Module) ->
|
|
reset_last(elixir_module:data_tables(Module)).
|
|
|
|
local_for(Module, Name, Arity, Kinds) ->
|
|
Tuple = {Name, Arity},
|
|
|
|
try
|
|
{Set, Bag} = elixir_module:data_tables(Module),
|
|
{ets:lookup(Set, {def, Tuple}), ets:lookup(Bag, {clauses, Tuple})}
|
|
of
|
|
{[{_, Kind, Meta, _, _, _}], Clauses} ->
|
|
case (Kinds == all) orelse (lists:member(Kind, Kinds)) of
|
|
true -> elixir_erl:definition_to_anonymous(Module, Kind, Meta,
|
|
[Clause || {_, Clause} <- Clauses]);
|
|
false -> false
|
|
end;
|
|
{[], _} ->
|
|
false
|
|
catch
|
|
_:_ -> false
|
|
end.
|
|
|
|
%% Take a definition out of the table
|
|
|
|
take_definition(Module, {Name, Arity} = Tuple) ->
|
|
{Set, Bag} = elixir_module:data_tables(Module),
|
|
case ets:take(Set, {def, Tuple}) of
|
|
[{{def, Tuple}, _, _, _, _, {Defaults, _, _}} = Result] ->
|
|
ets:delete_object(Bag, {defs, Tuple}),
|
|
ets:delete_object(Bag, {{default, Name}, Arity, Defaults}),
|
|
{Result, [Clause || {_, Clause} <- ets:take(Bag, {clauses, Tuple})]};
|
|
[] ->
|
|
false
|
|
end.
|
|
|
|
%% Fetch all available definitions
|
|
|
|
fetch_definitions(File, Module) ->
|
|
{Set, Bag} = elixir_module:data_tables(Module),
|
|
|
|
Entries = try
|
|
lists:sort(ets:lookup_element(Bag, defs, 2))
|
|
catch
|
|
error:badarg -> []
|
|
end,
|
|
|
|
{All, Private} = fetch_definition(Entries, File, Module, Set, Bag, [], []),
|
|
Unreachable = elixir_locals:warn_unused_local(File, Module, All, Private),
|
|
elixir_locals:ensure_no_undefined_local(File, Module, All),
|
|
elixir_locals:ensure_no_import_conflict(File, Module, All),
|
|
{All, Unreachable}.
|
|
|
|
fetch_definition([Tuple | T], File, Module, Set, Bag, All, Private) ->
|
|
[{_, Kind, Meta, _, Check, {MaxDefaults, _, Defaults}}] = ets:lookup(Set, {def, Tuple}),
|
|
|
|
try ets:lookup_element(Bag, {clauses, Tuple}, 2) of
|
|
Clauses ->
|
|
NewAll =
|
|
[{Tuple, Kind, add_defaults_to_meta(MaxDefaults, Meta), Clauses} | All],
|
|
NewPrivate =
|
|
case (Kind == defp) orelse (Kind == defmacrop) of
|
|
true ->
|
|
Metas = head_and_definition_meta(Check, Meta, MaxDefaults - Defaults, All),
|
|
[{Tuple, Kind, Metas, MaxDefaults} | Private];
|
|
false ->
|
|
Private
|
|
end,
|
|
fetch_definition(T, File, Module, Set, Bag, NewAll, NewPrivate)
|
|
catch
|
|
error:badarg ->
|
|
check_bodiless_function(Check, Meta, File, Module, Kind, Tuple),
|
|
fetch_definition(T, File, Module, Set, Bag, All, Private)
|
|
end;
|
|
|
|
fetch_definition([], _File, _Module, _Set, _Bag, All, Private) ->
|
|
{All, Private}.
|
|
|
|
add_defaults_to_meta(0, Meta) -> Meta;
|
|
add_defaults_to_meta(Defaults, Meta) -> [{defaults, Defaults} | Meta].
|
|
|
|
head_and_definition_meta(true, Meta, 0, _All) ->
|
|
Meta;
|
|
head_and_definition_meta(true, _Meta, _HeadDefaults, [{_, _, HeadMeta, _} | _]) ->
|
|
HeadMeta;
|
|
head_and_definition_meta(false, _Meta, _HeadDefaults, _All) ->
|
|
false.
|
|
|
|
%% Section for storing definitions
|
|
|
|
store_definition(Kind, CheckClauses, Call, Body, Pos) ->
|
|
#{line := Line} = E = elixir_locals:get_cached_env(Pos),
|
|
{NameAndArgs, Guards} = elixir_utils:extract_guards(Call),
|
|
|
|
{Name, Args} = case NameAndArgs of
|
|
{N, _, A} when is_atom(N), is_atom(A) -> {N, []};
|
|
{N, _, A} when is_atom(N), is_list(A) -> {N, A};
|
|
_ -> elixir_errors:form_error([{line, Line}], E, ?MODULE, {invalid_def, Kind, NameAndArgs})
|
|
end,
|
|
|
|
%% Now that we have verified the call format,
|
|
%% extract meta information like file and context.
|
|
{_, Meta, _} = Call,
|
|
|
|
Context = case lists:keyfind(context, 1, Meta) of
|
|
{context, _} = ContextPair -> [ContextPair];
|
|
_ -> []
|
|
end,
|
|
|
|
Generated = case lists:keyfind(generated, 1, Meta) of
|
|
{generated, true} -> ?generated(Context);
|
|
_ -> Context
|
|
end,
|
|
|
|
DoCheckClauses = (Context == []) andalso (CheckClauses),
|
|
|
|
%% Check if there is a file information in the definition.
|
|
%% If so, we assume this come from another source and
|
|
%% we need to linify taking into account keep line numbers.
|
|
%%
|
|
%% Line and File will always point to the caller. __ENV__.line
|
|
%% will always point to the quoted one and __ENV__.file will
|
|
%% always point to the one at @file or the quoted one.
|
|
{Location, LinifyArgs, LinifyGuards, LinifyBody} =
|
|
case elixir_utils:meta_keep(Meta) of
|
|
{_, _} = MetaFile ->
|
|
{MetaFile,
|
|
elixir_quote:linify(Line, keep, Args),
|
|
elixir_quote:linify(Line, keep, Guards),
|
|
elixir_quote:linify(Line, keep, Body)};
|
|
nil ->
|
|
{nil, Args, Guards, Body}
|
|
end,
|
|
|
|
Arity = length(Args),
|
|
|
|
{File, DefMeta} =
|
|
case retrieve_location(Location, ?key(E, module)) of
|
|
{F, L} ->
|
|
{F, [{line, Line}, {file, {F, L}} | Generated]};
|
|
nil ->
|
|
{nil, [{line, Line} | Generated]}
|
|
end,
|
|
|
|
run_with_location_change(File, E, fun(EL) ->
|
|
assert_no_aliases_name(DefMeta, Name, Args, EL),
|
|
assert_valid_name(DefMeta, Kind, Name, Args, EL),
|
|
store_definition(DefMeta, Kind, DoCheckClauses, Name, Arity,
|
|
LinifyArgs, LinifyGuards, LinifyBody, ?key(E, file), EL)
|
|
end).
|
|
|
|
store_definition(Meta, Kind, CheckClauses, Name, Arity, DefaultsArgs, Guards, Body, File, ER) ->
|
|
Module = ?key(ER, module),
|
|
Tuple = {Name, Arity},
|
|
E = env_for_expansion(Kind, Tuple, ER),
|
|
|
|
{Args, Defaults} = unpack_defaults(Kind, Meta, Name, DefaultsArgs, E),
|
|
Clauses = [elixir_clauses:def(Clause, E) ||
|
|
Clause <- def_to_clauses(Kind, Meta, Args, Guards, Body, E)],
|
|
|
|
DefaultsLength = length(Defaults),
|
|
elixir_locals:record_defaults(Tuple, Kind, Module, DefaultsLength, Meta),
|
|
check_previous_defaults(Meta, Module, Name, Arity, Kind, DefaultsLength, E),
|
|
|
|
store_definition(CheckClauses, Kind, Meta, Name, Arity, File,
|
|
Module, DefaultsLength, Clauses),
|
|
[store_definition(false, Kind, Meta, Name, length(DefaultArgs), File,
|
|
Module, 0, [Default]) || {_, DefaultArgs, _, _} = Default <- Defaults],
|
|
|
|
run_on_definition_callbacks(Kind, Module, Name, DefaultsArgs, Guards, Body, E),
|
|
Tuple.
|
|
|
|
env_for_expansion(Kind, Tuple, E) when Kind =:= defmacro; Kind =:= defmacrop ->
|
|
E#{function := Tuple, contextual_vars := ['__CALLER__']};
|
|
env_for_expansion(_Kind, Tuple, E) ->
|
|
E#{function := Tuple, contextual_vars := []}.
|
|
|
|
retrieve_location(Location, Module) ->
|
|
{Set, _} = elixir_module:data_tables(Module),
|
|
case ets:take(Set, file) of
|
|
[] when is_tuple(Location) ->
|
|
{File, Line} = Location,
|
|
{elixir_utils:relative_to_cwd(File), Line};
|
|
[] ->
|
|
nil;
|
|
[{file, File, _}] when is_binary(File) ->
|
|
'Elixir.Module':delete_attribute(Module, file),
|
|
{elixir_utils:relative_to_cwd(File), 0};
|
|
[{file, {File, Line}, _}] when is_binary(File) andalso is_integer(Line) ->
|
|
'Elixir.Module':delete_attribute(Module, file),
|
|
{elixir_utils:relative_to_cwd(File), Line}
|
|
end.
|
|
|
|
run_with_location_change(nil, E, Callback) ->
|
|
Callback(E);
|
|
run_with_location_change(File, #{file := File} = E, Callback) ->
|
|
Callback(E);
|
|
run_with_location_change(File, E, Callback) ->
|
|
elixir_lexical:with_file(File, E, Callback).
|
|
|
|
def_to_clauses(_Kind, Meta, Args, [], nil, E) ->
|
|
check_args_for_function_head(Meta, Args, E),
|
|
[];
|
|
def_to_clauses(_Kind, Meta, Args, Guards, [{do, Body}], _E) ->
|
|
[{Meta, Args, Guards, Body}];
|
|
def_to_clauses(Kind, Meta, Args, Guards, Body, E) ->
|
|
case is_list(Body) andalso lists:keyfind(do, 1, Body) of
|
|
{do, _} ->
|
|
[{Meta, Args, Guards, {'try', [{origin, Kind} | Meta], [Body]}}];
|
|
false ->
|
|
elixir_errors:form_error(Meta, E, elixir_expand, {missing_option, Kind, [do]})
|
|
end.
|
|
|
|
run_on_definition_callbacks(Kind, Module, Name, Args, Guards, Body, E) ->
|
|
{_, Bag} = elixir_module:data_tables(Module),
|
|
Callbacks = ets:lookup_element(Bag, {accumulate, on_definition}, 2),
|
|
_ = [Mod:Fun(E, Kind, Name, Args, Guards, Body) || {Mod, Fun} <- lists:reverse(Callbacks)],
|
|
ok.
|
|
|
|
store_definition(Check, Kind, Meta, Name, Arity, File, Module, Defaults, Clauses) ->
|
|
{Set, Bag} = elixir_module:data_tables(Module),
|
|
Tuple = {Name, Arity},
|
|
HasBody = Clauses =/= [],
|
|
|
|
if
|
|
Defaults > 0 ->
|
|
ets:insert(Bag, {{default, Name}, Arity, Defaults});
|
|
true ->
|
|
ok
|
|
end,
|
|
|
|
{MaxDefaults, FirstMeta} =
|
|
case ets:lookup(Set, {def, Tuple}) of
|
|
[{_, StoredKind, StoredMeta, StoredFile, StoredCheck, {StoredDefaults, LastHasBody, LastDefaults}}] ->
|
|
check_valid_kind(Meta, File, Name, Arity, Kind, StoredKind, StoredFile, StoredMeta),
|
|
check_valid_defaults(Meta, File, Name, Arity, Kind, Defaults, StoredDefaults, LastDefaults, HasBody, LastHasBody),
|
|
(Check and StoredCheck) andalso
|
|
check_valid_clause(Meta, File, Name, Arity, Kind, Set, StoredMeta, StoredFile, Clauses),
|
|
|
|
{max(Defaults, StoredDefaults), StoredMeta};
|
|
[] ->
|
|
ets:insert(Bag, {defs, Tuple}),
|
|
{Defaults, Meta}
|
|
end,
|
|
|
|
Check andalso ets:insert(Set, {?last_def, Tuple}),
|
|
ets:insert(Bag, [{{clauses, Tuple}, Clause} || Clause <- Clauses]),
|
|
ets:insert(Set, {{def, Tuple}, Kind, FirstMeta, File, Check, {MaxDefaults, HasBody, Defaults}}).
|
|
|
|
%% Handling of defaults
|
|
|
|
unpack_defaults(Kind, Meta, Name, Args, E) ->
|
|
Expanded = expand_defaults(Args, E#{context := nil}),
|
|
unpack_defaults(Kind, Meta, Name, Expanded, [], []).
|
|
|
|
unpack_defaults(Kind, Meta, Name, [{'\\\\', DefaultMeta, [Expr, _]} | T] = List, Acc, Clauses) ->
|
|
Base = match_defaults(Acc, length(Acc), []),
|
|
{Args, Invoke} = extract_defaults(List, length(Base), [], []),
|
|
Clause = {Meta, Base ++ Args, [], {super, [{super, {Kind, Name}} | DefaultMeta], Base ++ Invoke}},
|
|
unpack_defaults(Kind, Meta, Name, T, [Expr | Acc], [Clause | Clauses]);
|
|
unpack_defaults(Kind, Meta, Name, [H | T], Acc, Clauses) ->
|
|
unpack_defaults(Kind, Meta, Name, T, [H | Acc], Clauses);
|
|
unpack_defaults(_Kind, _Meta, _Name, [], Acc, Clauses) ->
|
|
{lists:reverse(Acc), lists:reverse(Clauses)}.
|
|
|
|
expand_defaults([{'\\\\', Meta, [Expr, Default]} | Args], E) ->
|
|
{ExpandedDefault, _} = elixir_expand:expand(Default, E),
|
|
[{'\\\\', Meta, [Expr, ExpandedDefault]} | expand_defaults(Args, E)];
|
|
expand_defaults([Arg | Args], E) ->
|
|
[Arg | expand_defaults(Args, E)];
|
|
expand_defaults([], _E) ->
|
|
[].
|
|
|
|
extract_defaults([{'\\\\', _, [_Expr, Default]} | T], Counter, NewArgs, NewInvoke) ->
|
|
extract_defaults(T, Counter, NewArgs, [Default | NewInvoke]);
|
|
extract_defaults([_ | T], Counter, NewArgs, NewInvoke) ->
|
|
H = default_var(Counter),
|
|
extract_defaults(T, Counter + 1, [H | NewArgs], [H | NewInvoke]);
|
|
extract_defaults([], _Counter, NewArgs, NewInvoke) ->
|
|
{lists:reverse(NewArgs), lists:reverse(NewInvoke)}.
|
|
|
|
match_defaults([], 0, Acc) ->
|
|
Acc;
|
|
match_defaults([_ | T], Counter, Acc) ->
|
|
NewCounter = Counter - 1,
|
|
match_defaults(T, NewCounter, [default_var(NewCounter) | Acc]).
|
|
|
|
default_var(Counter) ->
|
|
{list_to_atom([$x | integer_to_list(Counter)]), [{generated, true}, {version, Counter}], ?var_context}.
|
|
|
|
%% Validations
|
|
|
|
check_valid_kind(_Meta, _File, _Name, _Arity, Kind, Kind, _StoredFile, _StoredMeta) -> ok;
|
|
check_valid_kind(Meta, File, Name, Arity, Kind, StoredKind, StoredFile, StoredMeta) ->
|
|
elixir_errors:form_error(Meta, File, ?MODULE,
|
|
{changed_kind, {Name, Arity, StoredKind, Kind, StoredFile, ?line(StoredMeta)}}).
|
|
|
|
check_valid_clause(Meta, File, Name, Arity, Kind, Set, StoredMeta, StoredFile, Clauses) ->
|
|
case ets:lookup_element(Set, ?last_def, 2) of
|
|
none ->
|
|
ok;
|
|
{Name, Arity} when Clauses == [] ->
|
|
elixir_errors:form_warn(Meta, File, ?MODULE,
|
|
{late_function_head, {Kind, Name, Arity}});
|
|
{Name, Arity} ->
|
|
ok;
|
|
{Name, _} ->
|
|
Relative = elixir_utils:relative_to_cwd(StoredFile),
|
|
elixir_errors:form_warn(Meta, File, ?MODULE,
|
|
{ungrouped_name, {Kind, Name, Arity, ?line(StoredMeta), Relative}});
|
|
_ ->
|
|
Relative = elixir_utils:relative_to_cwd(StoredFile),
|
|
elixir_errors:form_warn(Meta, File, ?MODULE,
|
|
{ungrouped_arity, {Kind, Name, Arity, ?line(StoredMeta), Relative}})
|
|
end.
|
|
|
|
% Clause with defaults after clause with defaults
|
|
check_valid_defaults(Meta, File, Name, Arity, Kind, Defaults, StoredDefaults, _, _, _)
|
|
when Defaults > 0, StoredDefaults > 0 ->
|
|
elixir_errors:form_error(Meta, File, ?MODULE, {duplicate_defaults, {Kind, Name, Arity}});
|
|
% Clause with defaults after clause without defaults
|
|
check_valid_defaults(Meta, File, Name, Arity, Kind, Defaults, 0, _, _, _) when Defaults > 0 ->
|
|
elixir_errors:form_warn(Meta, File, ?MODULE, {mixed_defaults, {Kind, Name, Arity}});
|
|
% Clause without defaults directly after clause with defaults (bodiless does not count)
|
|
check_valid_defaults(Meta, File, Name, Arity, Kind, 0, _, LastDefaults, true, true) when LastDefaults > 0 ->
|
|
elixir_errors:form_warn(Meta, File, ?MODULE, {mixed_defaults, {Kind, Name, Arity}});
|
|
% Clause without defaults
|
|
check_valid_defaults(_Meta, _File, _Name, _Arity, _Kind, 0, _StoredDefaults, _LastDefaults, _HasBody, _LastHasBody) ->
|
|
ok.
|
|
|
|
check_bodiless_function(Check, _Meta, _File, Module, _Kind, _Tuple)
|
|
when Check == false; Module == 'Elixir.Module' ->
|
|
ok;
|
|
check_bodiless_function(_Check, Meta, File, _Module, Kind, Tuple) ->
|
|
elixir_errors:form_error(Meta, File, ?MODULE, {function_head, Kind, Tuple}).
|
|
|
|
check_args_for_function_head(Meta, Args, E) ->
|
|
[begin
|
|
elixir_errors:form_error(Meta, E, ?MODULE, invalid_args_for_function_head)
|
|
end || Arg <- Args, invalid_arg(Arg)].
|
|
|
|
invalid_arg({Name, _, Kind}) when is_atom(Name), is_atom(Kind) -> false;
|
|
invalid_arg(_) -> true.
|
|
|
|
check_previous_defaults(Meta, Module, Name, Arity, Kind, Defaults, E) ->
|
|
{_Set, Bag} = elixir_module:data_tables(Module),
|
|
Matches = ets:lookup(Bag, {default, Name}),
|
|
[begin
|
|
elixir_errors:form_error(Meta, E, ?MODULE,
|
|
{defs_with_defaults, Kind, Name, Arity, A})
|
|
end || {_, A, D} <- Matches, A /= Arity, D /= 0, defaults_conflict(A, D, Arity, Defaults)].
|
|
|
|
defaults_conflict(A, D, Arity, Defaults) ->
|
|
((Arity >= (A - D)) andalso (Arity < A)) orelse
|
|
((A >= (Arity - Defaults)) andalso (A < Arity)).
|
|
|
|
assert_no_aliases_name(Meta, '__aliases__', [Atom], #{file := File}) when is_atom(Atom) ->
|
|
elixir_errors:form_error(Meta, File, ?MODULE, {no_alias, Atom});
|
|
assert_no_aliases_name(_Meta, _Aliases, _Args, _S) ->
|
|
ok.
|
|
|
|
assert_valid_name(Meta, Kind, '__info__', [_], #{file := File}) ->
|
|
elixir_errors:form_error(Meta, File, ?MODULE, {'__info__', Kind});
|
|
assert_valid_name(Meta, Kind, 'module_info', [], #{file := File}) ->
|
|
elixir_errors:form_error(Meta, File, ?MODULE, {module_info, Kind, 0});
|
|
assert_valid_name(Meta, Kind, 'module_info', [_], #{file := File}) ->
|
|
elixir_errors:form_error(Meta, File, ?MODULE, {module_info, Kind, 1});
|
|
assert_valid_name(Meta, Kind, is_record, [_, _], #{file := File}) when Kind == defp; Kind == def ->
|
|
elixir_errors:form_error(Meta, File, ?MODULE, {is_record, Kind});
|
|
assert_valid_name(_Meta, _Kind, _Name, _Args, _S) ->
|
|
ok.
|
|
|
|
%% Format errors
|
|
|
|
format_error({function_head, Kind, {Name, Arity}}) ->
|
|
io_lib:format("implementation not provided for predefined ~ts ~ts/~B", [Kind, Name, Arity]);
|
|
|
|
format_error({no_module, {Kind, Name, Arity}}) ->
|
|
io_lib:format("cannot define function outside module, invalid scope for ~ts ~ts/~B", [Kind, Name, Arity]);
|
|
|
|
format_error({defs_with_defaults, Kind, Name, Arity, A}) when Arity > A ->
|
|
io_lib:format("~ts ~ts/~B defaults conflicts with ~ts/~B",
|
|
[Kind, Name, Arity, Name, A]);
|
|
|
|
format_error({defs_with_defaults, Kind, Name, Arity, A}) when Arity < A ->
|
|
io_lib:format("~ts ~ts/~B conflicts with defaults from ~ts/~B",
|
|
[Kind, Name, Arity, Name, A]);
|
|
|
|
format_error({duplicate_defaults, {Kind, Name, Arity}}) ->
|
|
io_lib:format(
|
|
"~ts ~ts/~B defines defaults multiple times. "
|
|
"Elixir allows defaults to be declared once per definition. Instead of:\n"
|
|
"\n"
|
|
" def foo(:first_clause, b \\\\ :default) do ... end\n"
|
|
" def foo(:second_clause, b \\\\ :default) do ... end\n"
|
|
"\n"
|
|
"one should write:\n"
|
|
"\n"
|
|
" def foo(a, b \\\\ :default)\n"
|
|
" def foo(:first_clause, b) do ... end\n"
|
|
" def foo(:second_clause, b) do ... end\n",
|
|
[Kind, Name, Arity]);
|
|
|
|
format_error({mixed_defaults, {Kind, Name, Arity}}) ->
|
|
io_lib:format(
|
|
"~ts ~ts/~B has multiple clauses and also declares default values. "
|
|
"In such cases, the default values should be defined in a header. Instead of:\n"
|
|
"\n"
|
|
" def foo(:first_clause, b \\\\ :default) do ... end\n"
|
|
" def foo(:second_clause, b) do ... end\n"
|
|
"\n"
|
|
"one should write:\n"
|
|
"\n"
|
|
" def foo(a, b \\\\ :default)\n"
|
|
" def foo(:first_clause, b) do ... end\n"
|
|
" def foo(:second_clause, b) do ... end\n",
|
|
[Kind, Name, Arity]);
|
|
|
|
format_error({ungrouped_name, {Kind, Name, Arity, OrigLine, OrigFile}}) ->
|
|
io_lib:format("clauses with the same name should be grouped together, \"~ts ~ts/~B\" was previously defined (~ts:~B)",
|
|
[Kind, Name, Arity, OrigFile, OrigLine]);
|
|
|
|
format_error({ungrouped_arity, {Kind, Name, Arity, OrigLine, OrigFile}}) ->
|
|
io_lib:format("clauses with the same name and arity (number of arguments) should be grouped together, \"~ts ~ts/~B\" was previously defined (~ts:~B)",
|
|
[Kind, Name, Arity, OrigFile, OrigLine]);
|
|
|
|
format_error({late_function_head, {Kind, Name, Arity}}) ->
|
|
io_lib:format("function head for ~ts ~ts/~B must come at the top of its direct implementation. Instead of:\n"
|
|
"\n"
|
|
" def add(a, b), do: a + b\n"
|
|
" def add(a, b)\n"
|
|
"\n"
|
|
"one should write:\n"
|
|
"\n"
|
|
" def add(a, b)\n"
|
|
" def add(a, b), do: a + b\n",
|
|
[Kind, Name, Arity]);
|
|
|
|
format_error({changed_kind, {Name, Arity, Previous, Current, OrigFile, OrigLine}}) ->
|
|
OrigFileRelative = elixir_utils:relative_to_cwd(OrigFile),
|
|
io_lib:format("~ts ~ts/~B already defined as ~ts in ~ts:~B", [Current, Name, Arity, Previous, OrigFileRelative, OrigLine]);
|
|
|
|
format_error({no_alias, Atom}) ->
|
|
io_lib:format("function names should start with lowercase characters or underscore, invalid name ~ts", [Atom]);
|
|
|
|
format_error({invalid_def, Kind, NameAndArgs}) ->
|
|
io_lib:format("invalid syntax in ~ts ~ts", [Kind, 'Elixir.Macro':to_string(NameAndArgs)]);
|
|
|
|
format_error(invalid_args_for_function_head) ->
|
|
"only variables and \\\\ are allowed as arguments in function head.\n"
|
|
"\n"
|
|
"If you did not intend to define a function head, make sure your function "
|
|
"definition has the proper syntax by wrapping the arguments in parentheses "
|
|
"and using the do instruction accordingly:\n\n"
|
|
" def add(a, b), do: a + b\n\n"
|
|
" def add(a, b) do\n"
|
|
" a + b\n"
|
|
" end\n";
|
|
|
|
format_error({'__info__', Kind}) ->
|
|
io_lib:format("cannot define ~ts __info__/1 as it is automatically defined by Elixir", [Kind]);
|
|
|
|
format_error({module_info, Kind, Arity}) ->
|
|
io_lib:format("cannot define ~ts module_info/~B as it is automatically defined by Erlang", [Kind, Arity]);
|
|
|
|
format_error({is_record, Kind}) ->
|
|
io_lib:format("cannot define ~ts is_record/2 due to compatibility "
|
|
"issues with the Erlang compiler (it is a known limitation)", [Kind]).
|