From 16055085f761531ed1679c55fdcc14928aec1e1d Mon Sep 17 00:00:00 2001 From: Hans Bolinder Date: Thu, 21 Mar 2019 09:25:16 +0100 Subject: stdlib: Add option 'quote_singleton_atom_types' to erl_pp The new option can be used by Dialyzer, which has traditionally quoted singleton atom types. The OTP team has decided not to use the convention in OTP documentation, at least not for now. That is why the option is needed. EDoc does not use the new option. Syntax Tools does not have a similar option. --- lib/stdlib/doc/src/erl_pp.xml | 6 ++++- lib/stdlib/src/erl_pp.erl | 51 ++++++++++++++++++++++++++++++++-------- lib/stdlib/test/erl_pp_SUITE.erl | 18 +++++++++++++- 3 files changed, 63 insertions(+), 12 deletions(-) diff --git a/lib/stdlib/doc/src/erl_pp.xml b/lib/stdlib/doc/src/erl_pp.xml index f1c3aa5a41..0a46139db6 100644 --- a/lib/stdlib/doc/src/erl_pp.xml +++ b/lib/stdlib/doc/src/erl_pp.xml @@ -5,7 +5,7 @@
1996 - 2016 + 2019 Ericsson AB, All Rights Reserved @@ -65,6 +65,10 @@ + +

The option quote_singleton_atom_types + is used to add quotes to all singleton atom types.

+ diff --git a/lib/stdlib/src/erl_pp.erl b/lib/stdlib/src/erl_pp.erl index 3e68c1b225..2630c60859 100644 --- a/lib/stdlib/src/erl_pp.erl +++ b/lib/stdlib/src/erl_pp.erl @@ -41,10 +41,11 @@ io_lib:chars())). -type(option() :: {hook, hook_function()} - | {encoding, latin1 | unicode | utf8}). + | {encoding, latin1 | unicode | utf8} + | {quote_singleton_atom_types, boolean()}). -type(options() :: hook_function() | [option()]). --record(pp, {value_fun, string_fun, char_fun}). +-record(pp, {value_fun, singleton_atom_type_fun, string_fun, char_fun}). -record(options, {hook, encoding, opts}). @@ -206,22 +207,43 @@ options(Hook) -> #options{hook = Hook, encoding = encoding([]), opts = Hook}. state(Options) when is_list(Options) -> + Quote = proplists:get_bool(quote_singleton_atom_types, Options), case encoding(Options) of - latin1 -> state(); - unicode -> unicode_state() + latin1 -> latin1_state(Quote); + unicode -> unicode_state(Quote) end; state(_Hook) -> - state(). + latin1_state(false). -state() -> +latin1_state(Quote) -> Options = [{encoding,latin1}], - #pp{value_fun = fun(V) -> io_lib_pretty:print(V, Options) end, + ValueFun = fun(V) -> io_lib_pretty:print(V, Options) end, + SingletonFun = + case Quote of + true -> + fun(A) -> + io_lib:write_string_as_latin1(atom_to_list(A), $') + end; %' + false -> + ValueFun + end, + #pp{value_fun = ValueFun, + singleton_atom_type_fun = SingletonFun, string_fun = fun io_lib:write_string_as_latin1/1, char_fun = fun io_lib:write_char_as_latin1/1}. -unicode_state() -> +unicode_state(Quote) -> Options = [{encoding,unicode}], - #pp{value_fun = fun(V) -> io_lib_pretty:print(V, Options) end, + ValueFun = fun(V) -> io_lib_pretty:print(V, Options) end, + SingletonFun = + case Quote of + true -> + fun(A) -> io_lib:write_string(atom_to_list(A), $') end; %' + false -> + ValueFun + end, + #pp{value_fun = ValueFun, + singleton_atom_type_fun = SingletonFun, string_fun = fun io_lib:write_string/1, char_fun = fun io_lib:write_char/1}. @@ -350,7 +372,7 @@ ltype({user_type,Line,T,Ts}, _) -> ltype({remote_type,Line,[M,F,Ts]}, _) -> simple_type({remote,Line,M,F}, Ts); ltype({atom,_,T}, _) -> - {atom,T}; + {singleton_atom_type,T}; ltype(E, P) -> lexpr(E, P, options(none)). @@ -933,6 +955,7 @@ frmt(Item, I, PP) -> %%% - {prefer_nl,Sep,IPs}: forces linebreak between Is unlesss negative %%% indentation. %%% - {atom,A}: an atom +%%% - {singleton_atom_type,A}: an singleton atom type %%% - {char,C}: a character %%% - {string,S}: a string. %%% - {value,T}: a term. @@ -1000,6 +1023,8 @@ f({value,V}, I, ST, WT, PP) -> f(write_a_value(V, PP), I, ST, WT, PP); f({atom,A}, I, ST, WT, PP) -> f(write_an_atom(A, PP), I, ST, WT, PP); +f({singleton_atom_type,A}, I, ST, WT, PP) -> + f(write_a_singleton_atom_type(A, PP), I, ST, WT, PP); f({char,C}, I, ST, WT, PP) -> f(write_a_char(C, PP), I, ST, WT, PP); f({string,S}, I, ST, WT, PP) -> @@ -1144,6 +1169,9 @@ write_a_value(V, PP) -> write_an_atom(A, PP) -> flat_leaf(write_atom(A, PP)). +write_a_singleton_atom_type(A, PP) -> + flat_leaf(write_singleton_atom_type(A, PP)). + write_a_char(C, PP) -> flat_leaf(write_char(C, PP)). @@ -1178,6 +1206,9 @@ write_value(V, PP) -> write_atom(A, PP) -> (PP#pp.value_fun)(A). +write_singleton_atom_type(A, PP) -> + (PP#pp.singleton_atom_type_fun)(A). + write_string(S, PP) -> (PP#pp.string_fun)(S). diff --git a/lib/stdlib/test/erl_pp_SUITE.erl b/lib/stdlib/test/erl_pp_SUITE.erl index e5d1910070..c79e29eb11 100644 --- a/lib/stdlib/test/erl_pp_SUITE.erl +++ b/lib/stdlib/test/erl_pp_SUITE.erl @@ -47,6 +47,7 @@ hook/1, neg_indent/1, maps_syntax/1, + quoted_atom_types/1, otp_6321/1, otp_6911/1, otp_6914/1, otp_8150/1, otp_8238/1, otp_8473/1, otp_8522/1, otp_8567/1, otp_8664/1, otp_9147/1, @@ -74,7 +75,7 @@ groups() -> [{expr, [], [func, call, recs, try_catch, if_then, receive_after, bits, head_tail, cond1, block, case1, ops, - messages, maps_syntax + messages, maps_syntax, quoted_atom_types ]}, {attributes, [], [misc_attrs, import_export, dialyzer_attrs]}, {tickets, [], @@ -912,6 +913,21 @@ maps_syntax(Config) when is_list(Config) -> ok = pp_forms(F), ok. +quoted_atom_types(Config) when is_list(Config) -> + Q = [{quote_singleton_atom_types, true}], + U = [{encoding,unicode}], + L = [{encoding,latin1}], + F = "-type t() :: a | a().", + "-type t() :: 'a' | a().\n" = + lists:flatten(parse_and_pp_forms(F, Q ++ L)), + "-type t() :: 'a' | a().\n" = + lists:flatten(parse_and_pp_forms(F, Q ++ U)), + UF = "-type t() :: '\x{400}' | '\x{400}'().", + "-type t() :: '\\x{400}' | '\\x{400}'().\n" = + lists:flatten(parse_and_pp_forms(UF, Q ++ L)), + "-type t() :: '\x{400}' | '\x{400}'().\n" = + lists:flatten(parse_and_pp_forms(UF, Q ++ U)), + ok. %% OTP_8567. Avoid duplicated 'undefined' in record field types. otp_8567(Config) when is_list(Config) -> -- cgit v1.2.3