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-rw-r--r--lib/stdlib/src/erl_pp.erl19
-rw-r--r--lib/stdlib/test/erl_pp_SUITE.erl23
2 files changed, 41 insertions, 1 deletions
diff --git a/lib/stdlib/src/erl_pp.erl b/lib/stdlib/src/erl_pp.erl
index 8a1d8e0440..9dbe89da91 100644
--- a/lib/stdlib/src/erl_pp.erl
+++ b/lib/stdlib/src/erl_pp.erl
@@ -479,6 +479,15 @@ lexpr({record_field, _, Rec, F}, Prec, Opts) ->
{L,P,R} = inop_prec('.'),
El = [lexpr(Rec, L, Opts),$.,lexpr(F, R, Opts)],
maybe_paren(P, Prec, El);
+lexpr({map, _, Fs}, Prec, Opts) ->
+ {P,_R} = preop_prec('#'),
+ El = {first,leaf("#"),map_fields(Fs, Opts)},
+ maybe_paren(P, Prec, El);
+lexpr({map, _, Map, Fs}, Prec, Opts) ->
+ {L,P,_R} = inop_prec('#'),
+ Rl = lexpr(Map, L, Opts),
+ El = {first,[Rl,leaf("#")],map_fields(Fs, Opts)},
+ maybe_paren(P, Prec, El);
lexpr({block,_,Es}, _, Opts) ->
{list,[{step,'begin',body(Es, Opts)},'end']};
lexpr({'if',_,Cs}, _, Opts) ->
@@ -671,6 +680,16 @@ record_field({typed_record_field,Field,Type}, Opts) ->
record_field({record_field,_,F}, Opts) ->
lexpr(F, 0, Opts).
+map_fields(Fs, Opts) ->
+ tuple(Fs, fun map_field/2, Opts).
+
+map_field({map_field_assoc,_,K,V}, Opts) ->
+ Pl = lexpr(K, 0, Opts),
+ {list,[{step,[Pl,leaf(" =>")],lexpr(V, 0, Opts)}]};
+map_field({map_field_exact,_,K,V}, Opts) ->
+ Pl = lexpr(K, 0, Opts),
+ {list,[{step,[Pl,leaf(" :=")],lexpr(V, 0, Opts)}]}.
+
list({cons,_,H,T}, Es, Opts) ->
list(T, [H|Es], Opts);
list({nil,_}, Es, Opts) ->
diff --git a/lib/stdlib/test/erl_pp_SUITE.erl b/lib/stdlib/test/erl_pp_SUITE.erl
index cc744ee76b..390322a5fa 100644
--- a/lib/stdlib/test/erl_pp_SUITE.erl
+++ b/lib/stdlib/test/erl_pp_SUITE.erl
@@ -46,6 +46,7 @@
import_export/1, misc_attrs/1, dialyzer_attrs/1,
hook/1,
neg_indent/1,
+ maps_syntax/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,
@@ -76,7 +77,8 @@ groups() ->
[{expr, [],
[func, call, recs, try_catch, if_then, receive_after,
bits, head_tail, cond1, block, case1, ops,
- messages, old_mnemosyne_syntax]},
+ messages, old_mnemosyne_syntax, maps_syntax
+ ]},
{attributes, [], [misc_attrs, import_export, dialyzer_attrs]},
{tickets, [],
[otp_6321, otp_6911, otp_6914, otp_8150, otp_8238,
@@ -975,6 +977,25 @@ count_atom(L, A) when is_list(L) ->
count_atom(_, _) ->
0.
+maps_syntax(doc) -> "Maps syntax";
+maps_syntax(suite) -> [];
+maps_syntax(Config) when is_list(Config) ->
+ Ts = [{map_fun_1,
+ <<"t() ->\n"
+ " M0 = #{ 1 => hi, hi => 42, 1.0 => {hi,world}},\n"
+ " M1 = M0#{ 1 := hello, new_val => 1337 },\n"
+ " map_fun_2:val(M1).\n">>},
+ {map_fun_2,
+ <<"val(#{ 1 := V1, hi := V2, new_val := V3}) -> {V1,V2,V3}.\n">>}],
+ compile(Config, Ts),
+
+ ok = pp_expr(<<"#{}">>),
+ ok = pp_expr(<<"#{ a => 1, <<\"hi\">> => \"world\", 33 => 1.0 }">>),
+ ok = pp_expr(<<"#{ a := V1, <<\"hi\">> := V2 } = M">>),
+ ok = pp_expr(<<"M#{ a => V1, <<\"hi\">> := V2 }">>),
+ ok.
+
+
otp_8567(doc) ->
"OTP_8567. Avoid duplicated 'undefined' in record field types.";
otp_8567(suite) -> [];