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erlfmt_format_SUITE.erl
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erlfmt_format_SUITE.erl
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%% Copyright (c) Facebook, Inc. and its affiliates.
%%
%% 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
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% 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.
-module(erlfmt_format_SUITE).
-include_lib("common_test/include/ct.hrl").
-include_lib("stdlib/include/assert.hrl").
%% Test server callbacks
-export([
suite/0,
all/0,
groups/0,
init_per_suite/1,
end_per_suite/1,
init_per_group/2,
end_per_group/2,
init_per_testcase/2,
end_per_testcase/2
]).
%% Test cases
-export([
literals/1,
string_concat/1,
unary_operator/1,
binary_operator/1,
tuple/1,
list/1,
binary/1,
map_create/1,
map_update/1,
record_create/1,
record_update/1,
record_index/1,
record_field/1,
list_comprehension/1,
binary_comprehension/1,
call/1,
block/1,
fun_expression/1,
case_expression/1,
receive_expression/1,
try_expression/1,
if_expression/1,
macro/1,
function/1,
attribute/1,
record_definition/1,
spec/1,
define/1,
type/1,
comment/1,
force_break/1
]).
suite() ->
[{timetrap, {seconds, 10}}].
init_per_suite(Config) ->
Config.
end_per_suite(_Config) ->
ok.
init_per_group(_GroupName, Config) ->
Config.
end_per_group(_GroupName, _Config) ->
ok.
init_per_testcase(_TestCase, Config) ->
Config.
end_per_testcase(_TestCase, _Config) ->
ok.
groups() ->
[
{expressions, [parallel], [
literals,
string_concat,
{group, containers},
{group, operators},
{group, comprehensions},
call,
block,
fun_expression,
case_expression,
receive_expression,
try_expression,
if_expression,
macro
]},
{forms, [parallel], [
function,
attribute,
spec,
record_definition,
define,
type
]},
{operators, [parallel], [
unary_operator,
binary_operator
]},
{containers, [parallel], [
tuple,
list,
binary,
map_create,
map_update,
{group, records},
force_break
]},
{records, [parallel], [
record_create,
record_update,
record_index,
record_field
]},
{comprehensions, [parallel], [
list_comprehension,
binary_comprehension
]}
].
all() ->
[
{group, expressions},
{group, forms},
comment
].
%%--------------------------------------------------------------------
%% TEST CASES
-define(assertSame(String), ?assertSame(String, 80)).
-define(assertSame(String, PageWidth),
?assertEqual(String, format(String, PageWidth))
).
-define(assertFormat(Bad, Good), ?assertFormat(Bad, Good, 80)).
-define(assertFormat(Bad, Good, PageWidth), begin
?assertEqual(Good, format(Good, PageWidth)),
?assertEqual(Good, format(Bad, PageWidth))
end).
literals(Config) when is_list(Config) ->
?assertSame("100"),
?assertSame("007"),
?assertSame("10#1000"),
?assertSame("2#101"),
?assertSame("16#01"),
?assertSame("16#deadBEEF"),
?assertSame("001.100"),
?assertSame("1.0e-1"),
?assertSame("001.100e-010"),
?assertSame("1.0E01"),
?assertSame("$a"),
?assertSame("$\x{1F605}"),
?assertSame("$\\0"),
?assertSame("$\\\\"),
?assertSame("$\\t"),
?assertSame("$\\z"),
?assertSame("$\\040"),
?assertSame("$\\xAb"),
?assertSame("$\\x{Ab}"),
?assertSame("'foo'"),
?assertSame("foo"),
?assertSame("'andalso'"),
?assertSame("'foo bar'"),
?assertSame("'foo\\tbar'"),
?assertSame("'\\''"),
?assertSame("'foo\\xaB'"),
?assertSame("'foo\\x{aB}'"),
?assertSame("'foo\\z'"),
?assertSame("'foo\\s'"),
?assertSame("\"'\""),
?assertSame("\"\x{1F631}\""),
?assertSame("\" \\40\\x32\\x{0032}\""),
?assertSame("\"The quick brown fox jumps over the lazy dog\""),
?assertSame("\"\\s \""),
?assertSame("Foo"),
?assertSame("_Bar"),
?assertFormat("$ ", "$\\s").
string_concat(Config) when is_list(Config) ->
?assertSame("\"foo\" \"bar\""),
?assertFormat(
"\"foo\" \"bar\"",
"\"foo\"\n"
"\"bar\"",
5
),
%% Measures text size in graphemes (\x{61}\x{301} is á in NFD normalisation)
?assertSame("\"\x{61}\x{301}\" \"á\"", 7),
?assertFormat(
"\"\x{61}\x{301}\" \"á\"",
"\"\x{61}\x{301}\"\n"
"\"á\"",
6
),
?assertSame("\"foo\" Foo \"bar\""),
%% Multiline strings are converted to sequence of concats
?assertFormat(
"\"foo\nbar\"",
"\"foo\\n\"\n"
"\"bar\""
),
?assertFormat(
"\"foo\nbar\n\"",
"\"foo\\n\"\n"
"\"bar\\n\""
),
?assertFormat(
"\"foo\n\"",
"\"foo\\n\""
).
unary_operator(Config) when is_list(Config) ->
%% Formats symbolic operators without space
?assertFormat("+ 1", "+1"),
?assertFormat("- 1", "-1"),
%% Formats word operators with space
?assertSame("bnot 1"),
?assertSame("not true"),
?assertSame("catch 1"),
%% Does not change parenthesis, only whitespace
?assertFormat("bnot+1", "bnot +1"),
?assertSame("+ +1"),
?assertSame("+(+1)"),
?assertSame("+ -1"),
?assertSame("-(+1)"),
?assertSame("not catch 1"),
?assertFormat("not(1 + 1)", "not (1 + 1)"),
?assertFormat("(bnot 1)*1", "(bnot 1) * 1"),
?assertSame("(catch 1) + 1"),
%% Unless it's nested not or bnot
?assertSame("bnot bnot Var"),
?assertSame("not not true").
binary_operator(Config) when is_list(Config) ->
%% No changes to parens
?assertSame("CRC bxor Byte band 16#ff"),
?assertSame("(CRC bsl 8) bxor Byte"),
?assertSame("Foo ++ Bar ++ Baz -- Bat"),
?assertSame("Foo ++ Bar ++ (Baz -- Bat)"),
?assertSame("Foo ++ (Bar ++ Baz) -- Bat"),
?assertSame("Foo > Bar andalso Baz =:= Bat"),
?assertSame("Foo and Bar or (Baz and Bat)"),
%% Nested same operator right-associative
?assertSame("Foo ++ Bar ++ Baz"),
?assertFormat(
"Foo ++ Bar ++ Baz",
"Foo ++\n"
" Bar ++ Baz",
15
),
?assertFormat(
"Foo ++ Bar ++ Baz",
"Foo ++\n"
" Bar ++\n"
" Baz",
5
),
?assertFormat(
"(Foo ++ Bar) ++ Baz",
"(Foo ++ Bar) ++\n"
" Baz",
15
),
?assertFormat(
"(Foo ++ Bar) ++ Baz",
"(Foo ++\n"
" Bar) ++\n"
" Baz",
5
),
%% Nested same operator left-associative
?assertSame("Foo + Bar + Baz"),
?assertFormat(
"Foo + Bar + Baz",
"Foo + Bar +\n"
" Baz",
14
),
?assertFormat(
"Foo + Bar + Baz",
"Foo +\n"
" Bar +\n"
" Baz",
5
),
?assertFormat(
"Foo + (Bar + Baz)",
"Foo +\n"
" (Bar + Baz)",
15
),
?assertFormat(
"Foo + (Bar + Baz)",
"Foo +\n"
" (Bar +\n"
" Baz)",
5
),
%% With precedence
?assertFormat("(A + B) == C + D", "(A + B) == C + D"),
?assertSame("A + (B == C) + D"),
?assertFormat(
"A + B == (C + D)",
"A + B ==\n"
" (C + D)",
15
),
?assertFormat(
"Foo * (B + C) * D",
"Foo *\n"
" (B + C) *\n"
" D",
13
),
?assertFormat(
"A * (B + C) * D",
"A * (B + C) *\n"
" D",
13
),
?assertFormat(
"One * (Two + Three + Four) * Five",
"One *\n"
" (Two + Three +\n"
" Four) * Five",
25
),
%% Next break fits
?assertSame(
"Foo = [\n"
" 1\n"
"]"
),
?assertSame(
"Foo = foo(\n"
" 1\n"
")"
),
?assertSame(
"Foo = ?foo(\n"
" 1\n"
")"
),
?assertSame(
"Foo = fun () ->\n"
" ok\n"
"end",
15
),
?assertSame(
"foo() :: #{\n"
" a := integer()\n"
"}"
),
%% Keeps existing breaks
?assertSame(
"Foo andalso\n"
" Bar andalso\n"
" Baz"
).
tuple(Config) when is_list(Config) ->
?assertFormat("{ }", "{}"),
?assertFormat("{1,2}", "{1, 2}"),
?assertFormat("{1,{2,3}}", "{1, {2, 3}}"),
?assertFormat(
"{verylong,{2,3,4}}",
"{verylong,\n"
" {2, 3, 4}}",
20
),
?assertFormat(
"{long,x,{2,3,4},y}",
"{long, x,\n"
" {2, 3, 4}, y}",
20
),
?assertFormat(
"{verylong,x,{2,3,4},y,{5,6,7},z}",
"{verylong, x,\n"
" {2, 3, 4}, y,\n"
" {5, 6, 7}, z}",
20
),
?assertFormat(
"{{a,long,tuple},{nested,1,long,tuple}}",
"{{a, long, tuple},\n"
" {nested, 1,\n"
" long,\n"
" tuple}}",
20
),
?assertFormat(
"{{a,long,tuple},[nested,1,long,list]}",
"{{a, long, tuple}, [\n"
" nested,\n"
" 1,\n"
" long,\n"
" list\n"
"]}",
20
),
?assertFormat(
"{{a,long,tuple},{another,tuple},[nested,1,long,list]}",
"{{a, long, tuple},\n"
" {another, tuple},\n"
" [\n"
" nested,\n"
" 1,\n"
" long,\n"
" list\n"
" ]}",
25
),
?assertFormat(
"{{a,long,tuple},the,atoms,[nested,long,list],other,bare,atoms,this_does_not_fit}",
"{{a, long, tuple},\n"
" the, atoms,\n"
" [\n"
" nested,\n"
" long,\n"
" list\n"
" ],\n"
" other, bare, atoms,\n"
" this_does_not_fit}",
25
),
?assertFormat(
"{short, {a,long,tuple}}",
"{short,\n"
" {a, long,\n"
" tuple}}",
15
).
list(Config) when is_list(Config) ->
?assertFormat("[\n]", "[]"),
?assertSame("[1 | [2 | []]]"),
?assertFormat("[ 1 ,2,3, 4]", "[1, 2, 3, 4]"),
?assertFormat("[1,2,3|4]", "[1, 2, 3 | 4]"),
?assertFormat(
"[long,[2,3,4]]",
"[\n"
" long,\n"
" [2, 3, 4]\n"
"]",
15
),
?assertFormat(
"[11,2|3]",
"[\n"
" 11,\n"
" 2 | 3\n"
"]",
10
),
?assertFormat(
"[11,22|33]",
"[\n"
" 11,\n"
" 22\n"
" | 33\n"
"]",
10
),
?assertFormat(
"[short, [long, word]]",
"[short, [\n"
" long,\n"
" word\n"
"]]",
15
).
binary(Config) when is_list(Config) ->
?assertFormat("<< >>", "<<>>"),
?assertSame(
"<<(1 + 1), (#{}), (#foo{}), (#{}#{}), (#foo{}#foo{}), (#foo.bar), (call())>>"
),
?assertSame("<<(1), 1>>"),
?assertSame("<<+1:5/integer-unit:8>>"),
?assertSame("<<\"żółć\"/utf8>>"),
?assertFormat("<<1/float,<<22,33>>/binary>>", "<<1/float, <<22, 33>>/binary>>"),
?assertFormat(
"<<1/float,<<22,33>>>>",
"<<1/float,\n"
" <<22,\n"
" 33>>>>",
15
),
?assertSame(
"<<\n"
" 1/float,\n"
" <<22, 33>>\n"
">>"
),
?assertSame(
"<<\n"
" 1/float,\n"
" <<\n"
" 22,\n"
" 33\n"
" >>\n"
">>"
).
map_create(Config) when is_list(Config) ->
?assertFormat("#{\n}", "#{}"),
?assertFormat("#{1:=2, 3=>4}", "#{1 := 2, 3 => 4}"),
?assertFormat(
"#{11 => 22, 33 => 44}",
"#{\n"
" 11 => 22,\n"
" 33 => 44\n"
"}",
15
),
?assertFormat(
"#{11 => 22, 33 => 44}",
"#{\n"
" 11 =>\n"
" 22,\n"
" 33 =>\n"
" 44\n"
"}",
10
).
map_update(Config) when is_list(Config) ->
?assertFormat("X # {\n}", "X#{}"),
?assertSame("#{}#{}"),
?assertSame("#{}#{}#{}"),
?assertSame("(X#foo.bar)#{}"),
?assertSame("(catch 1)#{}"),
?assertSame("X#{A => B, C := D}"),
?assertFormat(
"X#{11 => 22, 33 => 44}",
"X#{\n"
" 11 => 22,\n"
" 33 => 44\n"
"}",
15
),
?assertFormat(
"#{55 => 66, 77 => 88}#{11 => 22, 33 => 44}",
"#{\n"
" 55 => 66,\n"
" 77 => 88\n"
"}#{\n"
" 11 => 22,\n"
" 33 => 44\n"
"}",
15
),
?assertSame(
"#{\n"
" a => [\n"
" b\n"
" ],\n"
" c := d(\n"
" e\n"
" )\n"
"}"
).
record_create(Config) when is_list(Config) ->
?assertFormat("#foo{\n}", "#foo{}"),
?assertFormat("#foo{_=x}", "#foo{_ = x}"),
?assertFormat("#foo{a=1,b=2+3}", "#foo{a = 1, b = 2 + 3}"),
?assertFormat(
"#foo{a=1,b=2+3}",
"#foo{\n"
" a = 1,\n"
" b = 2 + 3\n"
"}",
10
),
?assertFormat(
"#foo{a=1,b=Foo+Bar}",
"#foo{\n"
" a = 1,\n"
" b =\n"
" Foo +\n"
" Bar\n"
"}",
10
),
?assertSame("#?FOO{}"),
?assertSame("?FOO{}"),
?assertSame(
"#foo{\n"
" a = [\n"
" b\n"
" ]\n"
"}"
),
?assertSame(
"#foo{\n"
" long_key =\n"
" [long_value]\n"
"}",
20
).
record_update(Config) when is_list(Config) ->
?assertFormat("X #foo {\n}", "X#foo{}"),
?assertSame("#foo{}#bar{}"),
?assertSame("#foo{}#bar{}#baz{}"),
?assertSame("X#foo.bar#baz{}"),
?assertSame("(catch 1)#foo{}"),
?assertFormat(
"X#foo{aa = aa, bb = bb}",
"X#foo{\n"
" aa = aa,\n"
" bb = bb\n"
"}",
15
),
?assertFormat(
"#foo{cc = cc, dd = dd}#foo{aa = aa, bb = bb}",
"#foo{\n"
" cc = cc,\n"
" dd = dd\n"
"}#foo{\n"
" aa = aa,\n"
" bb = bb\n"
"}",
15
),
?assertSame("X#?FOO{}"),
?assertSame("X?FOO{}").
record_index(Config) when is_list(Config) ->
?assertSame("#foo.bar"),
?assertSame("#?FOO.bar"),
?assertSame("?FOO.bar").
record_field(Config) when is_list(Config) ->
?assertSame("X#foo.bar"),
?assertSame("X#foo.bar#baz.bak"),
?assertSame("(catch X)#foo.bar"),
?assertFormat(
"(Foo + Bar)#foo.bar",
"(Foo +\n"
" Bar)#foo.bar",
5
),
?assertSame("X#?FOO.bar"),
?assertSame("X?FOO.bar").
force_break(Config) when is_list(Config) ->
?assertSame(
"[\n"
" %% foo\n"
"]"
),
?assertFormat(
"[x\n"
"]",
"[x]"
),
?assertFormat(
"[\n"
" x]",
"[\n"
" x\n"
"]"
),
?assertFormat(
"{x\n"
"}",
"{x}"
),
?assertFormat(
"{\n"
" x}",
"{\n"
" x\n"
"}"
),
?assertFormat(
"<<x\n"
">>",
"<<x>>"
),
?assertFormat(
"<<\n"
" x>>",
"<<\n"
" x\n"
">>"
),
?assertFormat(
"#{x => y\n"
"}",
"#{x => y}"
),
?assertFormat(
"X#{\n"
" x => y}",
"X#{\n"
" x => y\n"
"}"
),
?assertFormat(
"X#{x => y\n"
"}",
"X#{x => y}"
),
?assertFormat(
"X#{\n"
" x => y}",
"X#{\n"
" x => y\n"
"}"
),
?assertFormat(
"#foo{x = 1\n"
"}",
"#foo{x = 1}"
),
?assertFormat(
"#foo{\n"
" x = 1}",
"#foo{\n"
" x = 1\n"
"}"
),
?assertFormat(
"X#foo{x = 1\n"
"}",
"X#foo{x = 1}"
),
?assertFormat(
"X#foo{\n"
" x = 1}",
"X#foo{\n"
" x = 1\n"
"}"
),
?assertFormat(
"foo(x\n"
")",
"foo(x)"
),
?assertFormat(
"foo(\n"
" x)",
"foo(\n"
" x\n"
")"
),
?assertFormat(
"foo(x\n"
") -> x.",
"foo(x) -> x."
),
?assertFormat(
"foo(\n"
" x) -> x.",
"foo(\n"
" x\n"
") ->\n"
" x."
),
?assertFormat(
"foo(1) -> x;\n"
"foo(2) ->\n"
" y.",
"foo(1) -> x;\n"
"foo(2) -> y."
),
?assertFormat(
"foo(1) ->\n"
" x;\n"
"foo(2) -> y.",
"foo(1) ->\n"
" x;\n"
"foo(2) ->\n"
" y."
).
list_comprehension(Config) when is_list(Config) ->
?assertFormat("[X||X<-List]", "[X || X <- List]"),
?assertSame("[X || {X, Y} <- Results, X >= Y]"),
?assertSame("[X || <<X, Y>> <= Results, X >= Y]"),
?assertFormat(
"[[Very, Long, Expression] || X <- Y, X < 10]",
"[\n"
" [\n"
" Very,\n"
" Long,\n"
" Expression\n"
" ] || X <- Y, X < 10\n"
"]",
25
),
?assertFormat(
"[{Very, Long, Expression} || X <- Y, X < 10]",
"[\n"
" {Very, Long,\n"
" Expression}\n"
" || X <- Y, X < 10\n"
"]",
25
),
?assertFormat(
"[X || X <- LongExpr, X < 10]",
"[\n"
" X\n"
" || X <- LongExpr,\n"
" X < 10\n"
"]",
25
),
?assertFormat(
"[X || X <- VeryLongExpression, X < 10]",
"[\n"
" X\n"
" || X <-\n"
" VeryLongExpression,\n"
" X < 10\n"
"]",
25
).
binary_comprehension(Config) when is_list(Config) ->
?assertFormat("<<X||X<-List>>", "<<X || X <- List>>"),
?assertSame("<<X || <<X, Y>> <= Results, X >= Y>>"),
?assertFormat(
"<<(Long + Expression) || X <- Y, X < 10>>",
"<<\n"
" (Long + Expression)\n"
" || X <- Y, X < 10\n"
">>",
25
),
?assertFormat(
"<<X || <<X>> <= LongExpr, X < 10>>",
"<<\n"
" X\n"
" || <<X>> <= LongExpr,\n"
" X < 10\n"
">>",
25
),
?assertFormat(
"<<X || <<X>> <= VeryLongExpression, X < 10>>",
"<<\n"
" X\n"
" || <<X>> <=\n"
" VeryLongExpression,\n"
" X < 10\n"
">>",
25
).
call(Config) when is_list(Config) ->
?assertFormat("foo(\n)", "foo()"),
?assertSame("foo(1, 2, 3)"),
?assertSame("foo:bar(1, 2, 3)"),
?assertSame("Foo:Bar(1, 2, 3)"),
?assertSame("(get_module()):(get_fun())()"),
?assertFormat(
"long_name({Long, Expression})",
"long_name(\n"
" {Long, Expression}\n"
")",
25
),
?assertFormat(
"very_very_long_name([Very, Long, Expression])",
"very_very_long_name(\n"
" [\n"
" Very,\n"
" Long,\n"
" Expression\n"
" ]\n"
")",
20
),
?assertFormat(
"very_very_long_name({Very, Long, Expression})",
"very_very_long_name(\n"
" {Very, Long,\n"
" Expression}\n"
")",
20
),
?assertFormat(
"long_name({Long, Expression}, AnotherArgument)",
"long_name(\n"
" {Long, Expression},\n"
" AnotherArgument\n"
")",
25
),
?assertFormat(
"long_name(Arg, [Very, Long, Expression])",
"long_name(Arg, [\n"
" Very,\n"
" Long,\n"
" Expression\n"
"])",
25
),
?assertFormat(
"foo(bar(\n"
" 1\n"
"))",
"foo(\n"
" bar(\n"
" 1\n"
" )\n"
")"
).
block(Config) when is_list(Config) ->
?assertFormat(
"begin 1 end",
"begin\n"
" 1\n"
"end"
),
?assertFormat(
"begin long_expression(with_args), {Short, Expr} end",
"begin\n"
" long_expression(\n"
" with_args\n"
" ),\n"
" {Short, Expr}\n"
"end",
25
),
?assertSame(
"begin\n"
" foo(),\n"
"\n"
" bar()\n"
"end"
).
fun_expression(Config) when is_list(Config) ->
?assertSame("fun foo/1"),
?assertSame("fun Mod:Name/Arity"),
?assertSame("fun () -> ok end"),
?assertSame("fun (X) when is_integer(X) -> X end"),
?assertSame("fun Foo() -> Foo() end"),
?assertFormat(
"fun()->\n"
"ok end",
"fun () ->\n"
" ok\n"
"end"
),
?assertFormat(
"fun (x) -> x; (y) -> y end",
"fun\n"
" (x) -> x;\n"
" (y) -> y\n"
"end",
100
),
?assertFormat(
"fun (Long) -> Expression; (ok) -> ok end",
"fun\n"
" (Long) -> Expression;\n"
" (ok) -> ok\n"