%% ===================================================================== %% Licensed under the Apache License, Version 2.0 (the "License"); you may %% not use this file except in compliance with the License. You may obtain %% a copy of the License at %% %% Unless required by applicable law or agreed to in writing, software %% distributed under the License is distributed on an "AS IS" BASIS, %% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %% See the License for the specific language governing permissions and %% limitations under the License. %% %% Alternatively, you may use this file under the terms of the GNU Lesser %% General Public License (the "LGPL") as published by the Free Software %% Foundation; either version 2.1, or (at your option) any later version. %% If you wish to allow use of your version of this file only under the %% terms of the LGPL, you should delete the provisions above and replace %% them with the notice and other provisions required by the LGPL; see %% . If you do not delete the provisions %% above, a recipient may use your version of this file under the terms of %% either the Apache License or the LGPL. %% %% @copyright 1999-2014 Richard Carlsson %% @author Richard Carlsson %% @end %% ===================================================================== %% @doc Tidies and pretty-prints Erlang source code, removing unused %% functions, updating obsolete constructs and function calls, etc. %% %% Caveats: It is possible that in some intricate uses of macros, %% the automatic addition or removal of parentheses around uses or %% arguments could cause the resulting program to be rejected by the %% compiler; however, we have found no such case in existing %% code. Programs defining strange macros can usually not be read by %% this program, and in those cases, no changes will be made. %% %% If you really, really want to, you may call it "Inga". %% %% Disclaimer: The author accepts no responsibility for errors %% introduced in code that has been processed by the program. It has %% been reasonably well tested, but the possibility of errors remains. %% Keep backups of your original code safely stored, until you feel %% confident that the new, modified code can be trusted. %% %% @type syntaxTree() = erl_syntax:syntaxTree(). An abstract syntax %% tree. See the {@link erl_syntax} module for details. %% %% @type filename() = file:filename(). -module(erl_tidy). -export([dir/0, dir/1, dir/2, file/1, file/2, module/1, module/2]). -include_lib("kernel/include/file.hrl"). -define(DEFAULT_BACKUP_SUFFIX, ".bak"). -define(DEFAULT_DIR, ""). -define(DEFAULT_REGEXP, ".*\\.erl$"). %% ===================================================================== -type options() :: [atom() | {atom(), any()}]. %% ===================================================================== dir__defaults() -> [{follow_links, false}, recursive, {regexp, ?DEFAULT_REGEXP}, verbose]. %% ===================================================================== %% @spec dir() -> ok %% @equiv dir("") -spec dir() -> 'ok'. dir() -> dir(""). %% ===================================================================== %% @spec dir(Dir) -> ok %% @equiv dir(Dir, []) -spec dir(file:filename()) -> 'ok'. dir(Dir) -> dir(Dir, []). %% ===================================================================== %% @spec dir(Directory::filename(), Options::[term()]) -> ok %% %% @doc Tidies Erlang source files in a directory and its %% subdirectories. %% %% Available options: %%
%%
{follow_links, boolean()}
%% %%
If the value is `true', symbolic directory %% links will be followed. The default value is %% `false'.
%% %%
{recursive, boolean()}
%% %%
If the value is `true', subdirectories will be %% visited recursively. The default value is %% `true'.
%% %%
{regexp, string()}
%% %%
The value denotes a regular expression (see module %% `re'). Tidying will only be applied to those %% regular files whose names match this pattern. The default %% value is `".*\\.erl$"', which matches normal %% Erlang source file names.
%% %%
{test, boolean()}
%% %%
If the value is `true', no files will be %% modified. The default value is `false'.
%% %%
{verbose, boolean()}
%% %%
If the value is `true', progress messages will %% be output while the program is running, unless the %% `quiet' option is `true'. The default %% value when calling {@link dir/2} is `true'.
%% %%
%% %% See the function {@link file/2} for further options. %% %% @see //stdlib/re %% @see file/2 -record(dir, {follow_links = false :: boolean(), recursive = true :: boolean(), options :: options()}). -spec dir(file:filename(), options()) -> 'ok'. dir(Dir, Opts) -> Opts1 = Opts ++ dir__defaults(), Env = #dir{follow_links = proplists:get_bool(follow_links, Opts1), recursive = proplists:get_bool(recursive, Opts1), options = Opts1}, Regexp = proplists:get_value(regexp, Opts1), case filename(Dir) of "" -> Dir1 = "."; Dir1 -> ok end, dir_1(Dir1, Regexp, Env). dir_1(Dir, Regexp, Env) -> case file:list_dir(Dir) of {ok, Files} -> lists:foreach(fun (X) -> dir_2(X, Regexp, Dir, Env) end, Files); {error, _} -> report_error("error reading directory `~ts'", [filename(Dir)]), exit(error) end. dir_2(Name, Regexp, Dir, Env) -> File = if Dir =:= "" -> Name; true -> filename:join(Dir, Name) end, case file_type(File) of {value, regular} -> dir_4(File, Regexp, Env); {value, directory} when Env#dir.recursive =:= true -> case is_symlink(Name) of false -> dir_3(Name, Dir, Regexp, Env); true when Env#dir.follow_links =:= true -> dir_3(Name, Dir, Regexp, Env); _ -> ok end; _ -> ok end. dir_3(Name, Dir, Regexp, Env) -> Dir1 = filename:join(Dir, Name), verbose("tidying directory `~ts'.", [Dir1], Env#dir.options), dir_1(Dir1, Regexp, Env). dir_4(File, Regexp, Env) -> case re:run(File, Regexp) of {match, _} -> Opts = [{outfile, File}, {dir, ""} | Env#dir.options], case catch file(File, Opts) of {'EXIT', Value} -> warn("error tidying `~ts'.~n~p", [File,Value], Opts); _ -> ok end; nomatch -> ok end. file__defaults() -> [{backup_suffix, ?DEFAULT_BACKUP_SUFFIX}, backups, {dir, ?DEFAULT_DIR}, {printer, default_printer()}, {quiet, false}, {verbose, false}]. default_printer() -> fun erl_prettypr:format/2. %% ===================================================================== %% @spec file(Name) -> ok %% @equiv file(Name, []) -spec file(file:filename()) -> 'ok'. file(Name) -> file(Name, []). %% ===================================================================== %% @spec file(Name::filename(), Options::[term()]) -> ok %% %% @doc Tidies an Erlang source code file. %% %% Available options are: %%
%%
{backup_suffix, string()}
%% %%
Specifies the file name suffix to be used when a backup %% file is created; the default value is `".bak"' %% (cf. the `backups' option).
%% %%
{backups, boolean()}
%% %%
If the value is `true', existing files will be %% renamed before new files are opened for writing. The new %% names are formed by appending the string given by the %% `backup_suffix' option to the original name. The %% default value is `true'.
%% %%
{dir, filename()}
%% %%
Specifies the name of the directory in which the output %% file is to be written. By default, the current directory is %% used. If the value is an empty string, the current directory %% is used.
%% %%
{outfile, filename()}
%% %%
Specifies the name of the file (without suffix) to which %% the resulting source code is to be written. If this option is %% not specified, the `Name' argument is used.
%% %%
{printer, Function}
%%
    %%
  • `Function = (syntaxTree(), [term()]) -> string()'
    • %%
%% %% Specifies a function for prettyprinting Erlang syntax trees. %% This is used for outputting the resulting module definition. %% The function is assumed to return formatted text for the given %% syntax tree, and should raise an exception if an error occurs. %% The default formatting function calls %% `erl_prettypr:format/2'.
%% %%
{test, boolean()}
%% %%
If the value is `true', no files will be modified; this %% is typically most useful if the `verbose' flag is enabled, to %% generate reports about the program files without affecting %% them. The default value is `false'.
%% %%
{stdout, boolean()}
%% %%
If the value is `true', instead of the file being written %% to disk it will be printed to stdout. The default value is %% `false'.
%% %%
%% %% See the function `module/2' for further options. %% %% @see erl_prettypr:format/2 %% @see module/2 -spec file(file:filename(), options()) -> 'ok'. file(Name, Opts) -> Parent = self(), Child = spawn_link(fun () -> file_1(Parent, Name, Opts) end), receive {Child, ok} -> ok; {Child, {error, Reason}} -> exit(Reason); {'EXIT', Child, Reason} -> exit(Reason) end. file_1(Parent, Name, Opts) -> try file_2(Name, Opts) of _ -> Parent ! {self(), ok} catch throw:syntax_error -> % ignore syntax errors Parent ! {self(), ok}; error:Reason -> Parent ! {self(), {error, Reason}} end. file_2(Name, Opts) -> Opts1 = Opts ++ file__defaults(), Forms = read_module(Name, Opts1), Comments = erl_comment_scan:file(Name), Forms1 = erl_recomment:recomment_forms(Forms, Comments), Tree = module(Forms1, [{file, Name} | Opts1]), case proplists:get_bool(test, Opts1) of true -> ok; false -> case proplists:get_bool(stdout, Opts1) of true -> print_module(Tree, Opts1), ok; false -> write_module(Tree, Name, Opts1), ok end end. read_module(Name, Opts) -> verbose("reading module `~ts'.", [filename(Name)], Opts), case epp_dodger:parse_file(Name, [no_fail]) of {ok, Forms} -> check_forms(Forms, Name), Forms; {error, R} -> error_read_file(Name), exit({error, R}) end. check_forms(Fs, Name) -> Fun = fun (F) -> case erl_syntax:type(F) of error_marker -> S = case erl_syntax:error_marker_info(F) of {_, M, D} -> M:format_error(D); _ -> "unknown error" end, report_error({Name, erl_syntax:get_pos(F), "\n ~ts"}, [S]), exit(error); _ -> ok end end, lists:foreach(Fun, Fs). %% Create the target directory and make a backup file if necessary, %% then open the file, output the text and close the file %% safely. Returns the file name. write_module(Tree, Name, Opts) -> Name1 = proplists:get_value(outfile, Opts, filename(Name)), Dir = filename(proplists:get_value(dir, Opts, "")), File = if Dir =:= "" -> Name1; true -> case file_type(Dir) of {value, directory} -> ok; {value, _} -> report_error("`~ts' is not a directory.", [filename(Dir)]), exit(error); none -> case file:make_dir(Dir) of ok -> verbose("created directory `~ts'.", [filename(Dir)], Opts), ok; E -> report_error("failed to create " "directory `~ts'.", [filename(Dir)]), exit({make_dir, E}) end end, filename(filename:join(Dir, Name1)) end, Encoding = [{encoding,Enc} || Enc <- [epp:read_encoding(Name)], Enc =/= none], case proplists:get_bool(backups, Opts) of true -> backup_file(File, Opts); false -> ok end, Printer = proplists:get_value(printer, Opts), FD = open_output_file(File, Encoding), verbose("writing to file `~ts'.", [File], Opts), V = (catch {ok, output(FD, Printer, Tree, Opts++Encoding)}), ok = file:close(FD), case V of {ok, _} -> File; {'EXIT', R} -> error_write_file(File), exit(R); R -> error_write_file(File), throw(R) end. print_module(Tree, Opts) -> Printer = proplists:get_value(printer, Opts), io:put_chars(Printer(Tree, Opts)). output(FD, Printer, Tree, Opts) -> io:put_chars(FD, Printer(Tree, Opts)), io:nl(FD). %% file_type(file:filename()) -> {value, Type} | none file_type(Name) -> file_type(Name, false). is_symlink(Name) -> file_type(Name, true) =:= {value, symlink}. file_type(Name, Links) -> V = case Links of true -> catch file:read_link_info(Name); false -> catch file:read_file_info(Name) end, case V of {ok, Env} -> {value, Env#file_info.type}; {error, enoent} -> none; {error, R} -> error_read_file(Name), exit({error, R}); {'EXIT', R} -> error_read_file(Name), exit(R); R -> error_read_file(Name), throw(R) end. open_output_file(FName, Options) -> case catch file:open(FName, [write]++Options) of {ok, FD} -> FD; {error, R} -> error_open_output(FName), exit({error, R}); {'EXIT', R} -> error_open_output(FName), exit(R); R -> error_open_output(FName), exit(R) end. %% If the file exists, rename it by appending the given suffix to the %% file name. backup_file(Name, Opts) -> case file_type(Name) of {value, regular} -> backup_file_1(Name, Opts); {value, _} -> error_backup_file(Name), exit(error); none -> ok end. %% The file should exist and be a regular file here. backup_file_1(Name, Opts) -> Suffix = proplists:get_value(backup_suffix, Opts, ""), Dest = filename:join(filename:dirname(Name), filename:basename(Name) ++ Suffix), case catch file:rename(Name, Dest) of ok -> verbose("made backup of file `~ts'.", [Name], Opts); {error, R} -> error_backup_file(Name), exit({error, R}); {'EXIT', R} -> error_backup_file(Name), exit(R); R -> error_backup_file(Name), throw(R) end. %% ===================================================================== %% @spec module(Forms) -> syntaxTree() %% @equiv module(Forms, []) -spec module(erl_syntax:forms()) -> erl_syntax:syntaxTree(). module(Forms) -> module(Forms, []). %% ===================================================================== %% @spec module(Forms, Options::[term()]) -> syntaxTree() %% %% Forms = syntaxTree() | [syntaxTree()] %% %% @doc Tidies a syntax tree representation of a module %% definition. The given `Forms' may be either a single %% syntax tree of type `form_list', or a list of syntax %% trees representing "program forms". In either case, %% `Forms' must represent a single complete module %% definition. The returned syntax tree has type %% `form_list' and represents a tidied-up version of the %% same source code. %% %% Available options are: %%
%%
{auto_export_vars, boolean()}
%% %%
If the value is `true', all matches %% "`{V1, ..., Vn} = E'" where `E' is a %% case-, if- or receive-expression whose branches all return %% n-tuples (or explicitly throw exceptions) will be rewritten %% to bind and export the variables `V1', ..., %% `Vn' directly. The default value is `false'. %% %% For example: %% 
%%                {X, Y} = case ... of
%%                             ... -> {17, foo()};
%%                             ... -> {42, bar()}
%%                         end
%%
%% will be rewritten to: %% 
%%                case ... of
%%                    ... -> X = 17, Y = foo(), {X, Y};
%%                    ... -> X = 42, Y = bar(), {X, Y}
%%                end
%%
%% %%
{auto_list_comp, boolean()}
%% %%
If the value is `true', calls to `lists:map/2' and %% `lists:filter/2' will be rewritten using list comprehensions. %% The default value is `true'.
%% %%
{file, string()}
%% %%
Specifies the name of the file from which the source code %% was taken. This is only used for generation of error %% reports. The default value is the empty string.
%% %%
{idem, boolean()}
%% %%
If the value is `true', all options that affect how the %% code is modified are set to "no changes". For example, to %% only update guard tests, and nothing else, use the options %% `[new_guard_tests, idem]'. (Recall that options closer to the %% beginning of the list have higher precedence.)
%% %%
{keep_unused, boolean()}
%% %%
If the value is `true', unused functions will %% not be removed from the code. The default value is %% `false'.
%% %%
{new_guard_tests, boolean()}
%% %%
If the value is `true', guard tests will be updated to %% use the new names, e.g. "`is_integer(X)'" instead of %% "`integer(X)'". The default value is `true'. See also %% `old_guard_tests'.
%% %%
{no_imports, boolean()}
%% %%
If the value is `true', all import statements will be %% removed and calls to imported functions will be expanded to %% explicit remote calls. The default value is `false'.
%% %%
{old_guard_tests, boolean()}
%% %%
If the value is `true', guard tests will be changed to %% use the old names instead of the new ones, e.g. %% "`integer(X)'" instead of "`is_integer(X)'". The default %% value is `false'. This option overrides the `new_guard_tests' %% option.
%% %%
{quiet, boolean()}
%% %%
If the value is `true', all information %% messages and warning messages will be suppressed. The default %% value is `false'.
%% %%
{rename, [{{atom(), atom(), integer()}, %% {atom(), atom()}}]}
%% %%
The value is a list of pairs, associating tuples %% `{Module, Name, Arity}' with tuples `{NewModule, NewName}', %% specifying renamings of calls to remote functions. By %% default, the value is the empty list. %% %% The renaming affects only remote calls (also when %% disguised by import declarations); local calls within a %% module are not affected, and no function definitions are %% renamed. Since the arity cannot change, the new name is %% represented by `{NewModule, NewName}' only. Only %% calls matching the specified arity will match; multiple %% entries are necessary for renaming calls to functions that %% have the same module and function name, but different %% arities. %% %% This option can also be used to override the default %% renaming of calls which use obsolete function names.
%% %%
{verbose, boolean()}
%% %%
If the value is `true', progress messages will be output %% while the program is running, unless the `quiet' option is %% `true'. The default value is `false'.
%% %%
-spec module(erl_syntax:forms(), [term()]) -> erl_syntax:syntaxTree(). module(Forms, Opts) when is_list(Forms) -> module(erl_syntax:form_list(Forms), Opts); module(Forms, Opts) -> Opts1 = proplists:expand(module__expansions(), Opts) ++ module__defaults(), File = proplists:get_value(file, Opts1, ""), Forms1 = erl_syntax:flatten_form_list(Forms), module_1(Forms1, File, Opts1). module__defaults() -> [{auto_export_vars, false}, {auto_list_comp, true}, {keep_unused, false}, {new_guard_tests, true}, {no_imports, false}, {old_guard_tests, false}, {quiet, false}, {verbose, false}]. module__expansions() -> [{idem, [{auto_export_vars, false}, {auto_list_comp, false}, {keep_unused, true}, {new_guard_tests, false}, {no_imports, false}, {old_guard_tests, false}]}]. module_1(Forms, File, Opts) -> Info = analyze_forms(Forms, File), Module = get_module_name(Info, File), Attrs = get_module_attributes(Info), Exports = get_module_exports(Info), Imports = get_module_imports(Info), Opts1 = check_imports(Imports, Opts, File), Fs = erl_syntax:form_list_elements(Forms), {Names, Defs} = collect_functions(Fs), Exports1 = check_export_all(Attrs, Names, Exports), Roots = ordsets:union(ordsets:from_list(Exports1), hidden_uses(Fs, Imports)), {Names1, Used, Imported, Defs1} = visit_used(Names, Defs, Roots, Imports, Module, Opts1), Fs1 = update_forms(Fs, Defs1, Imported, Opts1), Fs2 = filter_forms(Fs1, Names1, Used, Opts1), rewrite(Forms, erl_syntax:form_list(Fs2)). analyze_forms(Forms, File) -> case catch {ok, erl_syntax_lib:analyze_forms(Forms)} of {ok, L1} -> L1; syntax_error -> report_error({File, 0, "syntax error."}), throw(syntax_error); {'EXIT', R} -> exit(R); R -> throw(R) end. -spec get_module_name([erl_syntax_lib:info_pair()], string()) -> atom(). get_module_name(List, File) -> case lists:keyfind(module, 1, List) of {module, M} -> M; _ -> report_error({File, 0, "cannot determine module name."}), exit(error) end. get_module_attributes(List) -> case lists:keyfind(attributes, 1, List) of {attributes, As} -> As; _ -> [] end. -spec get_module_exports([erl_syntax_lib:info_pair()]) -> [{atom(), arity()}]. get_module_exports(List) -> case lists:keyfind(exports, 1, List) of {exports, Es} -> Es; _ -> [] end. -spec get_module_imports([erl_syntax_lib:info_pair()]) -> [{atom(), atom()}]. get_module_imports(List) -> case lists:keyfind(imports, 1, List) of {imports, Is} -> flatten_imports(Is); _ -> [] end. compile_attrs(As) -> lists:append([if is_list(T) -> T; true -> [T] end || {compile, T} <- As]). -spec flatten_imports([{atom(), [atom()]}]) -> [{atom(), atom()}]. flatten_imports(Is) -> [{F, M} || {M, Fs} <- Is, F <- Fs]. check_imports(Is, Opts, File) -> case check_imports_1(lists:sort(Is)) of true -> Opts; false -> case proplists:get_bool(no_imports, Opts) of true -> warn({File, 0, "conflicting import declarations - " "will not expand imports."}, [], Opts), %% prevent expansion of imports [{no_imports, false} | Opts]; false -> Opts end end. -spec check_imports_1([{atom(), atom()}]) -> boolean(). check_imports_1([{F, M1}, {F, M2} | _Is]) when M1 =/= M2 -> false; check_imports_1([_ | Is]) -> check_imports_1(Is); check_imports_1([]) -> true. check_export_all(Attrs, Names, Exports) -> case lists:member(export_all, compile_attrs(Attrs)) of true -> Exports ++ sets:to_list(Names); false -> Exports end. filter_forms(Fs, Names, Used, Opts) -> Keep = case proplists:get_bool(keep_unused, Opts) of true -> Names; false -> Used end, [F || F <- Fs, keep_form(F, Keep, Opts)]. keep_form(Form, Used, Opts) -> case erl_syntax:type(Form) of function -> N = erl_syntax_lib:analyze_function(Form), case sets:is_element(N, Used) of false -> {F, A} = N, File = proplists:get_value(file, Opts, ""), report({File, erl_syntax:get_pos(Form), "removing unused function `~tw/~w'."}, [F, A], Opts), false; true -> true end; attribute -> case erl_syntax_lib:analyze_attribute(Form) of {file, _} -> false; _ -> true end; error_marker -> false; warning_marker -> false; eof_marker -> false; _ -> true end. collect_functions(Forms) -> lists:foldl( fun (F, {Names, Defs}) -> case erl_syntax:type(F) of function -> N = erl_syntax_lib:analyze_function(F), {sets:add_element(N, Names), dict:store(N, {F, []}, Defs)}; _ -> {Names, Defs} end end, {sets:new(), dict:new()}, Forms). update_forms([F | Fs], Defs, Imports, Opts) -> case erl_syntax:type(F) of function -> N = erl_syntax_lib:analyze_function(F), {F1, Fs1} = dict:fetch(N, Defs), [F1 | lists:reverse(Fs1)] ++ update_forms(Fs, Defs, Imports, Opts); attribute -> [update_attribute(F, Imports, Opts) | update_forms(Fs, Defs, Imports, Opts)]; _ -> [F | update_forms(Fs, Defs, Imports, Opts)] end; update_forms([], _, _, _) -> []. update_attribute(F, Imports, Opts) -> case erl_syntax_lib:analyze_attribute(F) of {import, {M, Ns}} -> Ns1 = ordsets:from_list([N || N <- Ns, sets:is_element(N, Imports)]), case ordsets:subtract(ordsets:from_list(Ns), Ns1) of [] -> ok; Names -> File = proplists:get_value(file, Opts, ""), report({File, erl_syntax:get_pos(F), "removing unused imports:~ts"}, [[io_lib:fwrite("\n\t`~w:~tw/~w'", [M, N, A]) || {N, A} <- Names]], Opts) end, Is = [make_fname(N) || N <- Ns1], if Is =:= [] -> %% This will be filtered out later. erl_syntax:warning_marker(deleted); true -> F1 = erl_syntax:attribute(erl_syntax:atom(import), [erl_syntax:atom(M), erl_syntax:list(Is)]), rewrite(F, F1) end; {export, Ns} -> Es = [make_fname(N) || N <- ordsets:from_list(Ns)], F1 = erl_syntax:attribute(erl_syntax:atom(export), [erl_syntax:list(Es)]), rewrite(F, F1); _ -> F end. make_fname({F, A}) -> erl_syntax:arity_qualifier(erl_syntax:atom(F), erl_syntax:integer(A)). hidden_uses(Fs, Imports) -> Used = lists:foldl(fun (F, S) -> case erl_syntax:type(F) of attribute -> hidden_uses_1(F, S); _ -> S end end, [], Fs), ordsets:subtract(Used, ordsets:from_list([F || {F, _M} <- Imports])). hidden_uses_1(Tree, Used) -> erl_syntax_lib:fold(fun hidden_uses_2/2, Used, Tree). hidden_uses_2(Tree, Used) -> case erl_syntax:type(Tree) of application -> F = erl_syntax:application_operator(Tree), case erl_syntax:type(F) of atom -> As = erl_syntax:application_arguments(Tree), N = {erl_syntax:atom_value(F), length(As)}, case is_auto_imported(N) of true -> Used; false -> ordsets:add_element(N, Used) end; _ -> Used end; implicit_fun -> F = erl_syntax:implicit_fun_name(Tree), case catch {ok, erl_syntax_lib:analyze_function_name(F)} of {ok, {Name, Arity} = N} when is_atom(Name), is_integer(Arity) -> ordsets:add_element(N, Used); _ -> Used end; _ -> Used end. -type fa() :: {atom(), arity()}. -type context() :: 'guard_expr' | 'guard_test' | 'normal'. -record(env, {file :: file:filename(), module :: atom(), current :: fa() | 'undefined', imports = dict:new() :: dict:dict(atom(), atom()), context = normal :: context(), verbosity = 1 :: 0 | 1 | 2, quiet = false :: boolean(), no_imports = false :: boolean(), spawn_funs = false :: boolean(), auto_list_comp = true :: boolean(), auto_export_vars = false :: boolean(), new_guard_tests = true :: boolean(), old_guard_tests = false :: boolean()}). -record(st, {varc :: non_neg_integer() | 'undefined', used = sets:new() :: sets:set({atom(), arity()}), imported :: sets:set({atom(), arity()}), vars :: sets:set(atom()) | 'undefined', functions :: sets:set({atom(), arity()}), new_forms = [] :: [erl_syntax:syntaxTree()], rename :: dict:dict(mfa(), {atom(), atom()})}). visit_used(Names, Defs, Roots, Imports, Module, Opts) -> File = proplists:get_value(file, Opts, ""), NoImports = proplists:get_bool(no_imports, Opts), Rename = proplists:append_values(rename, Opts), loop(Roots, sets:new(), Defs, #env{file = File, module = Module, imports = dict:from_list(Imports), verbosity = verbosity(Opts), no_imports = NoImports, spawn_funs = proplists:get_bool(spawn_funs, Opts), auto_list_comp = proplists:get_bool(auto_list_comp, Opts), auto_export_vars = proplists:get_bool(auto_export_vars, Opts), new_guard_tests = proplists:get_bool(new_guard_tests, Opts), old_guard_tests = proplists:get_bool(old_guard_tests, Opts)}, #st{used = sets:from_list(Roots), imported = sets:new(), functions = Names, rename = dict:from_list([X || {F1, F2} = X <- Rename, is_remote_name(F1), is_atom_pair(F2)])}). loop([F | Work], Seen0, Defs0, Env, St0) -> case sets:is_element(F, Seen0) of true -> loop(Work, Seen0, Defs0, Env, St0); false -> Seen1 = sets:add_element(F, Seen0), case dict:find(F, Defs0) of {ok, {Form, Fs}} -> Vars = erl_syntax_lib:variables(Form), Form1 = erl_syntax_lib:annotate_bindings(Form, []), {Form2, St1} = visit(Form1, Env#env{current = F}, St0#st{varc = 1, used = sets:new(), vars = Vars, new_forms = []}), Fs1 = St1#st.new_forms ++ Fs, Defs1 = dict:store(F, {Form2, Fs1}, Defs0), Used = St1#st.used, Work1 = sets:to_list(Used) ++ Work, St2 = St1#st{used = sets:union(Used, St0#st.used)}, loop(Work1, Seen1, Defs1, Env, St2); error -> %% Quietly ignore any names that have no definition. loop(Work, Seen1, Defs0, Env, St0) end end; loop([], _, Defs, _, St) -> {St#st.functions, St#st.used, St#st.imported, Defs}. visit(Tree, Env, St0) -> case erl_syntax:type(Tree) of application -> visit_application(Tree, Env, St0); infix_expr -> visit_infix_expr(Tree, Env, St0); prefix_expr -> visit_prefix_expr(Tree, Env, St0); implicit_fun -> visit_implicit_fun(Tree, Env, St0); clause -> visit_clause(Tree, Env, St0); list_comp -> visit_list_comp(Tree, Env, St0); match_expr -> visit_match_expr(Tree, Env, St0); _ -> visit_other(Tree, Env, St0) end. visit_other(Tree, Env, St) -> F = fun (T, S) -> visit(T, Env, S) end, erl_syntax_lib:mapfold_subtrees(F, St, Tree). visit_list(Ts, Env, St0) -> lists:mapfoldl(fun (T, S) -> visit(T, Env, S) end, St0, Ts). visit_implicit_fun(Tree, _Env, St0) -> F = erl_syntax:implicit_fun_name(Tree), case catch {ok, erl_syntax_lib:analyze_function_name(F)} of {ok, {Name, Arity} = N} when is_atom(Name), is_integer(Arity) -> Used = sets:add_element(N, St0#st.used), {Tree, St0#st{used = Used}}; _ -> %% symbolic funs do not count as uses of a function {Tree, St0} end. visit_clause(Tree, Env, St0) -> %% We do not visit the patterns (for now, anyway). Ps = erl_syntax:clause_patterns(Tree), {G, St1} = case erl_syntax:clause_guard(Tree) of none -> {none, St0}; G0 -> visit(G0, Env#env{context = guard_test}, St0) end, {B, St2} = visit_list(erl_syntax:clause_body(Tree), Env, St1), {rewrite(Tree, erl_syntax:clause(Ps, G, B)), St2}. visit_infix_expr(Tree, #env{context = guard_test}, St0) -> %% Detect transition from guard test to guard expression. visit_other(Tree, #env{context = guard_expr, file = ""}, St0); visit_infix_expr(Tree, Env, St0) -> visit_other(Tree, Env, St0). visit_prefix_expr(Tree, #env{context = guard_test}, St0) -> %% Detect transition from guard test to guard expression. visit_other(Tree, #env{context = guard_expr, file = ""}, St0); visit_prefix_expr(Tree, Env, St0) -> visit_other(Tree, Env, St0). visit_application(Tree, Env, St0) -> Env1 = case Env of #env{context = guard_test} -> Env#env{context = guard_expr}; _ -> Env end, {F, St1} = visit(erl_syntax:application_operator(Tree), Env1, St0), {As, St2} = visit_list(erl_syntax:application_arguments(Tree), Env1, St1), case erl_syntax:type(F) of atom -> visit_atom_application(F, As, Tree, Env, St2); implicit_fun -> visit_named_fun_application(F, As, Tree, Env, St2); fun_expr -> visit_lambda_application(F, As, Tree, Env, St2); _ -> visit_nonlocal_application(F, As, Tree, Env, St2) end. visit_application_final(F, As, Tree, St0) -> {rewrite(Tree, erl_syntax:application(F, As)), St0}. revisit_application(F, As, Tree, Env, St0) -> visit(rewrite(Tree, erl_syntax:application(F, As)), Env, St0). visit_atom_application(F, As, Tree, #env{context = guard_test} = Env, St0) -> N = erl_syntax:atom_value(F), A = length(As), N1 = case Env#env.old_guard_tests of true -> reverse_guard_test(N, A); false -> case Env#env.new_guard_tests of true -> rewrite_guard_test(N, A); false -> N end end, if N1 =/= N -> report({Env#env.file, erl_syntax:get_pos(F), "changing guard test `~w' to `~w'."}, [N, N1], Env#env.verbosity); true -> ok end, %% No need to revisit here. F1 = rewrite(F, erl_syntax:atom(N1)), visit_application_final(F1, As, Tree, St0); visit_atom_application(F, As, Tree, #env{context = guard_expr}, St0) -> %% Atom applications in guard expressions are never local calls. visit_application_final(F, As, Tree, St0); visit_atom_application(F, As, Tree, Env, St0) -> N = {erl_syntax:atom_value(F), length(As)}, case is_auto_imported(N) of true -> visit_bif_call(N, F, As, Tree, Env, St0); false -> case is_imported(N, Env) of true -> visit_import_application(N, F, As, Tree, Env, St0); false -> Used = sets:add_element(N, St0#st.used), visit_application_final(F, As, Tree, St0#st{used = Used}) end end. visit_import_application({N, A} = Name, F, As, Tree, Env, St0) -> M = dict:fetch(Name, Env#env.imports), Expand = case Env#env.no_imports of true -> true; false -> auto_expand_import({M, N, A}, St0) end, case Expand of true -> report({Env#env.file, erl_syntax:get_pos(F), "expanding call to imported function `~w:~tw/~w'."}, [M, N, A], Env#env.verbosity), F1 = erl_syntax:module_qualifier(erl_syntax:atom(M), erl_syntax:atom(N)), revisit_application(rewrite(F, F1), As, Tree, Env, St0); false -> Is = sets:add_element(Name, St0#st.imported), visit_application_final(F, As, Tree, St0#st{imported = Is}) end. visit_bif_call({apply, 2}, F, [E, Args] = As, Tree, Env, St0) -> case erl_syntax:is_proper_list(Args) of true -> report({Env#env.file, erl_syntax:get_pos(F), "changing use of `apply/2' " "to direct function call."}, [], Env#env.verbosity), As1 = erl_syntax:list_elements(Args), revisit_application(E, As1, Tree, Env, St0); false -> visit_application_final(F, As, Tree, St0) end; visit_bif_call({apply, 3}, F, [M, N, Args] = As, Tree, Env, St0) -> case erl_syntax:is_proper_list(Args) of true -> report({Env#env.file, erl_syntax:get_pos(F), "changing use of `apply/3' " "to direct remote call."}, [], Env#env.verbosity), F1 = rewrite(F, erl_syntax:module_qualifier(M, N)), As1 = erl_syntax:list_elements(Args), visit_nonlocal_application(F1, As1, Tree, Env, St0); false -> visit_application_final(F, As, Tree, St0) end; visit_bif_call({spawn, 3} = N, F, [_, _, _] = As, Tree, Env, St0) -> visit_spawn_call(N, F, [], As, Tree, Env, St0); visit_bif_call({spawn_link, 3} = N, F, [_, _, _] = As, Tree, Env, St0) -> visit_spawn_call(N, F, [], As, Tree, Env, St0); visit_bif_call({spawn, 4} = N, F, [A | [_, _, _] = As], Tree, Env, St0) -> visit_spawn_call(N, F, [A], As, Tree, Env, St0); visit_bif_call({spawn_link, 4} = N, F, [A | [_, _, _] = As], Tree, Env, St0) -> visit_spawn_call(N, F, [A], As, Tree, Env, St0); visit_bif_call(_, F, As, Tree, _Env, St0) -> visit_application_final(F, As, Tree, St0). visit_spawn_call({N, A}, F, Ps, [A1, A2, A3] = As, Tree, #env{spawn_funs = true} = Env, St0) -> case erl_syntax:is_proper_list(A3) of true -> report({Env#env.file, erl_syntax:get_pos(F), "changing use of `~tw/~w' to `~tw/~w' with a fun."}, [N, A, N, 1 + length(Ps)], Env#env.verbosity), F1 = case erl_syntax:is_atom(A1, Env#env.module) of true -> A2; % calling self false -> clone(A1, erl_syntax:module_qualifier(A1, A2)) end, %% Need to do some scoping tricks here to make sure the %% arguments are evaluated by the parent, not by the spawned %% process. As1 = erl_syntax:list_elements(A3), {Vs, St1} = new_variables(length(As1), St0), E1 = clone(F1, erl_syntax:application(F1, Vs)), C1 = clone(E1, erl_syntax:clause([], [E1])), E2 = clone(C1, erl_syntax:fun_expr([C1])), C2 = clone(E2, erl_syntax:clause(Vs, [], [E2])), E3 = clone(C2, erl_syntax:fun_expr([C2])), E4 = clone(E3, erl_syntax:application(E3, As1)), E5 = erl_syntax_lib:annotate_bindings(E4, get_env(A1)), {E6, St2} = visit(E5, Env, St1), F2 = rewrite(F, erl_syntax:atom(N)), visit_nonlocal_application(F2, Ps ++ [E6], Tree, Env, St2); false -> visit_application_final(F, Ps ++ As, Tree, St0) end; visit_spawn_call(_, F, Ps, As, Tree, _Env, St0) -> visit_application_final(F, Ps ++ As, Tree, St0). visit_named_fun_application(F, As, Tree, Env, St0) -> Name = erl_syntax:implicit_fun_name(F), case catch {ok, erl_syntax_lib:analyze_function_name(Name)} of {ok, {A, N}} when is_atom(A), is_integer(N), N =:= length(As) -> case is_nonlocal({A, N}, Env) of true -> %% Making this a direct call would be an error. visit_application_final(F, As, Tree, St0); false -> report({Env#env.file, erl_syntax:get_pos(F), "changing application of implicit fun " "to direct local call."}, [], Env#env.verbosity), Used = sets:add_element({A, N}, St0#st.used), F1 = rewrite(F, erl_syntax:atom(A)), revisit_application(F1, As, Tree, Env, St0#st{used = Used}) end; _ -> visit_application_final(F, As, Tree, St0) end. visit_lambda_application(F, As, Tree, Env, St0) -> A = erl_syntax:fun_expr_arity(F), case A =:= length(As) of true -> report({Env#env.file, erl_syntax:get_pos(F), "changing application of fun-expression " "to local function call."}, [], Env#env.verbosity), {Base, _} = Env#env.current, Free = [erl_syntax:variable(V) || V <- get_free_vars(F)], N = length(Free), A1 = A + N, {Name, St1} = new_fname({Base, A1}, St0), Cs = augment_clauses(erl_syntax:fun_expr_clauses(F), Free), F1 = erl_syntax:atom(Name), New = rewrite(F, erl_syntax:function(F1, Cs)), Used = sets:add_element({Name, A1}, St1#st.used), Forms = [New | St1#st.new_forms], St2 = St1#st{new_forms = Forms, used = Used}, visit_application_final(F1, As ++ Free, Tree, St2); false -> warn({Env#env.file, erl_syntax:get_pos(F), "arity mismatch in fun-expression application."}, [], Env#env.verbosity), visit_application_final(F, As, Tree, St0) end. augment_clauses(Cs, Vs) -> [begin Ps = erl_syntax:clause_patterns(C), G = erl_syntax:clause_guard(C), Es = erl_syntax:clause_body(C), rewrite(C, erl_syntax:clause(Ps ++ Vs, G, Es)) end || C <- Cs]. visit_nonlocal_application(F, As, Tree, Env, St0) -> case erl_syntax:type(F) of tuple -> case erl_syntax:tuple_elements(F) of [X1, X2] -> report({Env#env.file, erl_syntax:get_pos(F), "changing application of 2-tuple " "to direct remote call."}, [], Env#env.verbosity), F1 = erl_syntax:module_qualifier(X1, X2), revisit_application(rewrite(F, F1), As, Tree, Env, St0); _ -> visit_application_final(F, As, Tree, St0) end; module_qualifier -> case catch {ok, erl_syntax_lib:analyze_function_name(F)} of {ok, {M, N}} when is_atom(M), is_atom(N) -> visit_remote_application({M, N, length(As)}, F, As, Tree, Env, St0); _ -> visit_application_final(F, As, Tree, St0) end; _ -> visit_application_final(F, As, Tree, St0) end. %% --- lists:append/2 and lists:subtract/2 --- visit_remote_application({lists, append, 2}, F, [A1, A2], Tree, Env, St0) -> report({Env#env.file, erl_syntax:get_pos(F), "replacing call to `lists:append/2' " "with the `++' operator."}, [], Env#env.verbosity), Tree1 = erl_syntax:infix_expr(A1, erl_syntax:operator('++'), A2), visit(rewrite(Tree, Tree1), Env, St0); visit_remote_application({lists, subtract, 2}, F, [A1, A2], Tree, Env, St0) -> report({Env#env.file, erl_syntax:get_pos(F), "replacing call to `lists:subtract/2' " "with the `--' operator."}, [], Env#env.verbosity), Tree1 = erl_syntax:infix_expr(A1, erl_syntax:operator('--'), A2), visit(rewrite(Tree, Tree1), Env, St0); %% --- lists:map/2 and lists:filter/2 --- visit_remote_application({lists, filter, 2}, F, [A1, A2] = As, Tree, Env, St0) -> case Env#env.auto_list_comp and (erl_syntax:type(A1) =/= variable) and (get_var_exports(A1) =:= []) and (get_var_exports(A2) =:= []) of true -> report({Env#env.file, erl_syntax:get_pos(F), "replacing call to `lists:filter/2' " "with a list comprehension."}, [], Env#env.verbosity), {V, St1} = new_variable(St0), G = clone(A2, erl_syntax:generator(V, A2)), T = clone(A1, erl_syntax:application(A1, [V])), L = erl_syntax:list_comp(V, [G, T]), L1 = erl_syntax_lib:annotate_bindings(L, get_env(Tree)), visit(rewrite(Tree, L1), Env, St1); false -> visit_application_final(F, As, Tree, St0) end; visit_remote_application({lists, map, 2}, F, [A1, A2] = As, Tree, Env, St0) -> case Env#env.auto_list_comp and (erl_syntax:type(A1) =/= variable) and (get_var_exports(A1) =:= []) and (get_var_exports(A2) =:= []) of true -> report({Env#env.file, erl_syntax:get_pos(F), "replacing call to `lists:map/2' " "with a list comprehension."}, [], Env#env.verbosity), {V, St1} = new_variable(St0), T = clone(A1, erl_syntax:application(A1, [V])), G = clone(A2, erl_syntax:generator(V, A2)), L = erl_syntax:list_comp(T, [G]), L1 = erl_syntax_lib:annotate_bindings(L, get_env(Tree)), visit(rewrite(Tree, L1), Env, St1); false -> visit_application_final(F, As, Tree, St0) end; %% --- all other functions --- visit_remote_application({M, N, A} = Name, F, As, Tree, Env, St) -> case is_auto_imported(Name) of true -> %% We don't remove the qualifier - it might be there for the %% sake of clarity. visit_bif_call({N, A}, F, As, Tree, Env, St); false -> case rename_remote_call(Name, St) of {M1, N1} -> report({Env#env.file, erl_syntax:get_pos(F), "updating obsolete call to `~w:~tw/~w' " "to use `~w:~tw/~w' instead."}, [M, N, A, M1, N1, A], Env#env.verbosity), M2 = erl_syntax:atom(M1), N2 = erl_syntax:atom(N1), F1 = erl_syntax:module_qualifier(M2, N2), revisit_application(rewrite(F, F1), As, Tree, Env, St); false -> visit_application_final(F, As, Tree, St) end end. -spec auto_expand_import(mfa(), #st{}) -> boolean(). auto_expand_import({lists, append, 2}, _St) -> true; auto_expand_import({lists, subtract, 2}, _St) -> true; auto_expand_import({lists, filter, 2}, _St) -> true; auto_expand_import({lists, map, 2}, _St) -> true; auto_expand_import(Name, St) -> case is_auto_imported(Name) of true -> true; false -> rename_remote_call(Name, St) =/= false end. visit_list_comp(Tree, Env, St0) -> Es = erl_syntax:list_comp_body(Tree), {Es1, St1} = visit_list_comp_body(Es, Env, St0), {T, St2} = visit(erl_syntax:list_comp_template(Tree), Env, St1), {rewrite(Tree, erl_syntax:list_comp(T, Es1)), St2}. visit_list_comp_body_join(Env) -> fun (E, St0) -> case is_generator(E) of true -> visit_generator(E, Env, St0); false -> visit_filter(E, Env, St0) end end. visit_list_comp_body(Es, Env, St0) -> lists:mapfoldl(visit_list_comp_body_join(Env), St0, Es). %% 'visit_filter' also handles uninteresting generators. visit_filter(E, Env, St0) -> visit(E, Env, St0). %% "interesting" generators have the form V <- [V || ...]; this can be %% unfolded as long as no bindings become erroneously shadowed. visit_generator(G, Env, St0) -> P = erl_syntax:generator_pattern(G), case erl_syntax:type(P) of variable -> B = erl_syntax:generator_body(G), case erl_syntax:type(B) of list_comp -> T = erl_syntax:list_comp_template(B), case erl_syntax:type(T) of variable -> visit_generator_1(G, Env, St0); _ -> visit_filter(G, Env, St0) end; _ -> visit_filter(G, Env, St0) end; _ -> visit_filter(G, Env, St0) end. visit_generator_1(G, Env, St0) -> recommend({Env#env.file, erl_syntax:get_pos(G), "unfold that this nested list comprehension can be unfolded " "by hand to get better efficiency."}, [], Env#env.verbosity), visit_filter(G, Env, St0). visit_match_expr(Tree, Env, St0) -> %% We do not visit the pattern (for now, anyway). P = erl_syntax:match_expr_pattern(Tree), {B, St1} = visit(erl_syntax:match_expr_body(Tree), Env, St0), case erl_syntax:type(P) of tuple -> Ps = erl_syntax:tuple_elements(P), case lists:all(fun is_variable/1, Ps) of true -> Vs = lists:sort([erl_syntax:variable_name(X) || X <- Ps]), case ordsets:is_set(Vs) of true -> Xs = get_var_exports(B), case ordsets:intersection(Vs, Xs) of [] -> visit_match_body(Ps, P, B, Tree, Env, St1); _ -> visit_match_expr_final(P, B, Tree, Env, St1) end; false -> visit_match_expr_final(P, B, Tree, Env, St1) end; false -> visit_match_expr_final(P, B, Tree, Env, St1) end; _ -> visit_match_expr_final(P, B, Tree, Env, St1) end. visit_match_expr_final(P, B, Tree, _Env, St0) -> {rewrite(Tree, erl_syntax:match_expr(P, B)), St0}. visit_match_body(_Ps, P, B, Tree, #env{auto_export_vars = false} = Env, St0) -> visit_match_expr_final(P, B, Tree, Env, St0); visit_match_body(Ps, P, B, Tree, Env, St0) -> case erl_syntax:type(B) of case_expr -> Cs = erl_syntax:case_expr_clauses(B), case multival_clauses(Cs, length(Ps), Ps) of {true, Cs1} -> report_export_vars(Env#env.file, erl_syntax:get_pos(B), "case", Env#env.verbosity), A = erl_syntax:case_expr_argument(B), Tree1 = erl_syntax:case_expr(A, Cs1), {rewrite(Tree, Tree1), St0}; false -> visit_match_expr_final(P, B, Tree, Env, St0) end; if_expr -> Cs = erl_syntax:if_expr_clauses(B), case multival_clauses(Cs, length(Ps), Ps) of {true, Cs1} -> report_export_vars(Env#env.file, erl_syntax:get_pos(B), "if", Env#env.verbosity), Tree1 = erl_syntax:if_expr(Cs1), {rewrite(Tree, Tree1), St0}; false -> visit_match_expr_final(P, B, Tree, Env, St0) end; cond_expr -> Cs = erl_syntax:cond_expr_clauses(B), case multival_clauses(Cs, length(Ps), Ps) of {true, Cs1} -> report_export_vars(Env#env.file, erl_syntax:get_pos(B), "cond", Env#env.verbosity), Tree1 = erl_syntax:cond_expr(Cs1), {rewrite(Tree, Tree1), St0}; false -> visit_match_expr_final(P, B, Tree, Env, St0) end; receive_expr -> %% Handle the timeout case as an extra clause. As = erl_syntax:receive_expr_action(B), C = erl_syntax:clause([], As), Cs = erl_syntax:receive_expr_clauses(B), case multival_clauses([C | Cs], length(Ps), Ps) of {true, [C1 | Cs1]} -> report_export_vars(Env#env.file, erl_syntax:get_pos(B), "receive", Env#env.verbosity), T = erl_syntax:receive_expr_timeout(B), As1 = erl_syntax:clause_body(C1), Tree1 = erl_syntax:receive_expr(Cs1, T, As1), {rewrite(Tree, Tree1), St0}; false -> visit_match_expr_final(P, B, Tree, Env, St0) end; _ -> visit_match_expr_final(P, B, Tree, Env, St0) end. multival_clauses(Cs, N, Vs) -> multival_clauses(Cs, N, Vs, []). multival_clauses([C | Cs], N, Vs, Cs1) -> case erl_syntax:clause_body(C) of [] -> false; Es -> E = lists:last(Es), case erl_syntax:type(E) of tuple -> Ts = erl_syntax:tuple_elements(E), if length(Ts) =:= N -> Bs = make_matches(E, Vs, Ts), Es1 = replace_last(Es, Bs), Ps = erl_syntax:clause_patterns(C), G = erl_syntax:clause_guard(C), C1 = erl_syntax:clause(Ps, G, Es1), multival_clauses(Cs, N, Vs, [rewrite(C, C1) | Cs1]); true -> false end; _ -> case erl_syntax_lib:is_fail_expr(E) of true -> %% We must add dummy bindings here so we %% don't introduce compilation errors due to %% "unsafe" variable exports. Bs = make_matches(Vs, erl_syntax:atom(false)), Es1 = replace_last(Es, Bs ++ [E]), Ps = erl_syntax:clause_patterns(C), G = erl_syntax:clause_guard(C), C1 = erl_syntax:clause(Ps, G, Es1), multival_clauses(Cs, N, Vs, [rewrite(C, C1) | Cs1]); false -> false end end end; multival_clauses([], _N, _Vs, Cs) -> {true, lists:reverse(Cs)}. make_matches(E, Vs, Ts) -> case make_matches(Vs, Ts) of [] -> []; [B | Bs] -> [rewrite(E, B) | Bs] % preserve comments on E (but not B) end. make_matches([V | Vs], [T | Ts]) -> [erl_syntax:match_expr(V, T) | make_matches(Vs, Ts)]; make_matches([V | Vs], T) when T =/= [] -> [erl_syntax:match_expr(V, T) | make_matches(Vs, T)]; make_matches([], _) -> []. rename_remote_call(F, St) -> case dict:find(F, St#st.rename) of error -> rename_remote_call_1(F); {ok, F1} -> F1 end. -spec rename_remote_call_1(mfa()) -> {atom(), atom()} | 'false'. rename_remote_call_1({dict, dict_to_list, 1}) -> {dict, to_list}; rename_remote_call_1({dict, list_to_dict, 1}) -> {dict, from_list}; rename_remote_call_1({erl_eval, arg_list, 2}) -> {erl_eval, expr_list}; rename_remote_call_1({erl_eval, arg_list, 3}) -> {erl_eval, expr_list}; rename_remote_call_1({erl_eval, seq, 2}) -> {erl_eval, exprs}; rename_remote_call_1({erl_eval, seq, 3}) -> {erl_eval, exprs}; rename_remote_call_1({erl_pp, seq, 1}) -> {erl_eval, seq}; rename_remote_call_1({erl_pp, seq, 2}) -> {erl_eval, seq}; rename_remote_call_1({erlang, info, 1}) -> {erlang, system_info}; rename_remote_call_1({io, parse_erl_seq, 1}) -> {io, parse_erl_exprs}; rename_remote_call_1({io, parse_erl_seq, 2}) -> {io, parse_erl_exprs}; rename_remote_call_1({io, parse_erl_seq, 3}) -> {io, parse_erl_exprs}; rename_remote_call_1({io, scan_erl_seq, 1}) -> {io, scan_erl_exprs}; rename_remote_call_1({io, scan_erl_seq, 2}) -> {io, scan_erl_exprs}; rename_remote_call_1({io, scan_erl_seq, 3}) -> {io, scan_erl_exprs}; rename_remote_call_1({io_lib, reserved_word, 1}) -> {erl_scan, reserved_word}; rename_remote_call_1({io_lib, scan, 1}) -> {erl_scan, string}; rename_remote_call_1({io_lib, scan, 2}) -> {erl_scan, string}; rename_remote_call_1({io_lib, scan, 3}) -> {erl_scan, tokens}; rename_remote_call_1({orddict, dict_to_list, 1}) -> {orddict, to_list}; rename_remote_call_1({orddict, list_to_dict, 1}) -> {orddict, from_list}; rename_remote_call_1({ordsets, list_to_set, 1}) -> {ordsets, from_list}; rename_remote_call_1({ordsets, new_set, 0}) -> {ordsets, new}; rename_remote_call_1({ordsets, set_to_list, 1}) -> {ordsets, to_list}; rename_remote_call_1({ordsets, subset, 2}) -> {ordsets, is_subset}; rename_remote_call_1({sets, list_to_set, 1}) -> {sets, from_list}; rename_remote_call_1({sets, new_set, 0}) -> {sets, new}; rename_remote_call_1({sets, set_to_list, 1}) -> {sets, to_list}; rename_remote_call_1({sets, subset, 2}) -> {sets, is_subset}; rename_remote_call_1({string, index, 2}) -> {string, str}; rename_remote_call_1({unix, cmd, 1}) -> {os, cmd}; rename_remote_call_1(_) -> false. -spec rewrite_guard_test(atom(), arity()) -> atom(). rewrite_guard_test(atom, 1) -> is_atom; rewrite_guard_test(binary, 1) -> is_binary; rewrite_guard_test(constant, 1) -> is_constant; rewrite_guard_test(float, 1) -> is_float; rewrite_guard_test(function, 1) -> is_function; rewrite_guard_test(function, 2) -> is_function; rewrite_guard_test(integer, 1) -> is_integer; rewrite_guard_test(list, 1) -> is_list; rewrite_guard_test(number, 1) -> is_number; rewrite_guard_test(pid, 1) -> is_pid; rewrite_guard_test(port, 1) -> is_port; rewrite_guard_test(reference, 1) -> is_reference; rewrite_guard_test(tuple, 1) -> is_tuple; rewrite_guard_test(record, 2) -> is_record; rewrite_guard_test(record, 3) -> is_record; rewrite_guard_test(N, _A) -> N. -spec reverse_guard_test(atom(), arity()) -> atom(). reverse_guard_test(is_atom, 1) -> atom; reverse_guard_test(is_binary, 1) -> binary; reverse_guard_test(is_constant, 1) -> constant; reverse_guard_test(is_float, 1) -> float; reverse_guard_test(is_function, 1) -> function; reverse_guard_test(is_function, 2) -> function; reverse_guard_test(is_integer, 1) -> integer; reverse_guard_test(is_list, 1) -> list; reverse_guard_test(is_number, 1) -> number; reverse_guard_test(is_pid, 1) -> pid; reverse_guard_test(is_port, 1) -> port; reverse_guard_test(is_reference, 1) -> reference; reverse_guard_test(is_tuple, 1) -> tuple; reverse_guard_test(is_record, 2) -> record; reverse_guard_test(is_record, 3) -> record; reverse_guard_test(N, _A) -> N. %% ===================================================================== %% Utility functions is_remote_name({M,F,A}) when is_atom(M), is_atom(F), is_integer(A) -> true; is_remote_name(_) -> false. is_atom_pair({M,F}) when is_atom(M), is_atom(F) -> true; is_atom_pair(_) -> false. replace_last([_E], Xs) -> Xs; replace_last([E | Es], Xs) -> [E | replace_last(Es, Xs)]. is_generator(E) -> erl_syntax:type(E) =:= generator. is_variable(E) -> erl_syntax:type(E) =:= variable. new_variables(N, St0) when N > 0 -> {V, St1} = new_variable(St0), {Vs, St2} = new_variables(N - 1, St1), {[V | Vs], St2}; new_variables(0, St) -> {[], St}. new_variable(St0) -> Fun = fun (N) -> list_to_atom("V" ++ integer_to_list(N)) end, Vs = St0#st.vars, {Name, N} = new_name(St0#st.varc, Fun, Vs), St1 = St0#st{varc = N + 1, vars = sets:add_element(Name, Vs)}, {erl_syntax:variable(Name), St1}. new_fname({F, A}, St0) -> Base = atom_to_list(F), Fun = fun (N) -> {list_to_atom(Base ++ "_" ++ integer_to_list(N)), A} end, Fs = St0#st.functions, {{F1, _A} = Name, _N} = new_name(1, Fun, Fs), {F1, St0#st{functions = sets:add_element(Name, Fs)}}. new_name(N, F, Set) -> Name = F(N), case sets:is_element(Name, Set) of true -> new_name(N + 1, F, Set); false -> {Name, N} end. is_imported(F, Env) -> dict:is_key(F, Env#env.imports). is_auto_imported({erlang, N, A}) -> is_auto_imported({N, A}); is_auto_imported({_, _N, _A}) -> false; is_auto_imported({N, A}) -> erl_internal:bif(N, A). is_nonlocal(N, Env) -> case is_imported(N, Env) of true -> true; false -> is_auto_imported(N) end. get_var_exports(Node) -> get_var_exports_1(erl_syntax:get_ann(Node)). get_var_exports_1([{bound, B} | _Bs]) -> B; get_var_exports_1([_ | Bs]) -> get_var_exports_1(Bs); get_var_exports_1([]) -> []. get_free_vars(Node) -> get_free_vars_1(erl_syntax:get_ann(Node)). get_free_vars_1([{free, B} | _Bs]) -> B; get_free_vars_1([_ | Bs]) -> get_free_vars_1(Bs); get_free_vars_1([]) -> []. filename([C | T]) when is_integer(C), C > 0 -> [C | filename(T)]; filename([H|T]) -> filename(H) ++ filename(T); filename([]) -> []; filename(N) when is_atom(N) -> atom_to_list(N); filename(N) -> report_error("bad filename: `~tP'.", [N, 25]), exit(error). get_env(Tree) -> case lists:keyfind(env, 1, erl_syntax:get_ann(Tree)) of {env, Env} -> Env; _ -> [] end. rewrite(Source, Target) -> erl_syntax:copy_attrs(Source, Target). clone(Source, Target) -> erl_syntax:copy_pos(Source, Target). %% ===================================================================== %% Reporting report_export_vars(F, L, Type, Opts) -> report({F, L, "rewrote ~s-expression to export variables."}, [Type], Opts). error_read_file(Name) -> report_error("error reading file `~ts'.", [filename(Name)]). error_write_file(Name) -> report_error("error writing to file `~ts'.", [filename(Name)]). error_backup_file(Name) -> report_error("could not create backup of file `~ts'.", [filename(Name)]). error_open_output(Name) -> report_error("cannot open file `~ts' for output.", [filename(Name)]). verbosity(Opts) -> case proplists:get_bool(quiet, Opts) of true -> 0; false -> case proplists:get_value(verbose, Opts) of true -> 2; N when is_integer(N) -> N; _ -> 1 end end. report_error(D) -> report_error(D, []). report_error({F, L, D}, Vs) -> report({F, L, {error, D}}, Vs); report_error(D, Vs) -> report({error, D}, Vs). %% warn(D, N) -> %% warn(D, [], N). warn({F, L, D}, Vs, N) -> report({F, L, {warning, D}}, Vs, N); warn(D, Vs, N) -> report({warning, D}, Vs, N). recommend(D, Vs, N) -> report({recommend, D}, Vs, N). verbose(D, Vs, N) -> report(2, D, Vs, N). report(D, Vs) -> report(D, Vs, 1). report(D, Vs, N) -> report(1, D, Vs, N). report(Level, _D, _Vs, N) when is_integer(N), N < Level -> ok; report(_Level, D, Vs, N) when is_integer(N) -> io:put_chars(format(D, Vs)); report(Level, D, Vs, Options) when is_list(Options) -> report(Level, D, Vs, verbosity(Options)). format({error, D}, Vs) -> ["error: ", format(D, Vs)]; format({warning, D}, Vs) -> ["warning: ", format(D, Vs)]; format({recommend, D}, Vs) -> ["recommendation: ", format(D, Vs)]; format({"", L, D}, Vs) when is_integer(L), L > 0 -> [io_lib:fwrite("~tw: ", [L]), format(D, Vs)]; format({"", _L, D}, Vs) -> format(D, Vs); format({F, L, D}, Vs) when is_integer(L), L > 0 -> [io_lib:fwrite("~ts:~tw: ", [filename(F), L]), format(D, Vs)]; format({F, _L, D}, Vs) -> [io_lib:fwrite("~ts: ", [filename(F)]), format(D, Vs)]; format(S, Vs) when is_list(S) -> [io_lib:fwrite(S, Vs), $\n]. %% =====================================================================