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-rw-r--r--lib/stdlib/src/edlin_expand.erl95
-rw-r--r--lib/stdlib/test/edlin_expand_SUITE.erl79
2 files changed, 140 insertions, 34 deletions
diff --git a/lib/stdlib/src/edlin_expand.erl b/lib/stdlib/src/edlin_expand.erl
index 5f821caef0..a1a97af4c5 100644
--- a/lib/stdlib/src/edlin_expand.erl
+++ b/lib/stdlib/src/edlin_expand.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 2005-2016. All Rights Reserved.
+%% Copyright Ericsson AB 2005-2017. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
@@ -101,44 +101,77 @@ match(Prefix, Alts, Extra0) ->
%% Return the list of names L in multiple columns.
format_matches(L) ->
- S = format_col(lists:sort(L), []),
+ {S1, Dots} = format_col(lists:sort(L), []),
+ S = case Dots of
+ true ->
+ {_, Prefix} = longest_common_head(vals(L)),
+ PrefixLen = length(Prefix),
+ case PrefixLen =< 3 of
+ true -> S1; % Do not replace the prefix with "...".
+ false ->
+ LeadingDotsL = leading_dots(L, PrefixLen),
+ {S2, _} = format_col(lists:sort(LeadingDotsL), []),
+ S2
+ end;
+ false -> S1
+ end,
["\n" | S].
format_col([], _) -> [];
-format_col(L, Acc) -> format_col(L, field_width(L), 0, Acc).
-
-format_col(X, Width, Len, Acc) when Width + Len > 79 ->
- format_col(X, Width, 0, ["\n" | Acc]);
-format_col([A|T], Width, Len, Acc0) ->
- H = case A of
- %% If it's a tuple {string(), integer()}, we assume it's an
- %% arity, and meant to be printed.
- {H0, I} when is_integer(I) ->
- H0 ++ "/" ++ integer_to_list(I);
- {H1, _} -> H1;
- H2 -> H2
- end,
- Acc = [io_lib:format("~-*ts", [Width,H]) | Acc0],
- format_col(T, Width, Len+Width, Acc);
-format_col([], _, _, Acc) ->
- lists:reverse(Acc, "\n").
-
-field_width(L) -> field_width(L, 0).
-
-field_width([{H,_}|T], W) ->
+format_col(L, Acc) ->
+ LL = 79,
+ format_col(L, field_width(L, LL), 0, Acc, LL, false).
+
+format_col(X, Width, Len, Acc, LL, Dots) when Width + Len > LL ->
+ format_col(X, Width, 0, ["\n" | Acc], LL, Dots);
+format_col([A|T], Width, Len, Acc0, LL, Dots) ->
+ {H0, R} = format_val(A),
+ Hmax = LL - length(R),
+ {H, NewDots} =
+ case length(H0) > Hmax of
+ true -> {io_lib:format("~-*ts", [Hmax - 3, H0]) ++ "...", true};
+ false -> {H0, Dots}
+ end,
+ Acc = [io_lib:format("~-*ts", [Width, H ++ R]) | Acc0],
+ format_col(T, Width, Len+Width, Acc, LL, NewDots);
+format_col([], _, _, Acc, _LL, Dots) ->
+ {lists:reverse(Acc, "\n"), Dots}.
+
+format_val({H, I}) when is_integer(I) ->
+ %% If it's a tuple {string(), integer()}, we assume it's an
+ %% arity, and meant to be printed.
+ {H, "/" ++ integer_to_list(I)};
+format_val({H, _}) ->
+ {H, ""};
+format_val(H) ->
+ {H, ""}.
+
+field_width(L, LL) -> field_width(L, 0, LL).
+
+field_width([{H,_}|T], W, LL) ->
case length(H) of
- L when L > W -> field_width(T, L);
- _ -> field_width(T, W)
+ L when L > W -> field_width(T, L, LL);
+ _ -> field_width(T, W, LL)
end;
-field_width([H|T], W) ->
+field_width([H|T], W, LL) ->
case length(H) of
- L when L > W -> field_width(T, L);
- _ -> field_width(T, W)
+ L when L > W -> field_width(T, L, LL);
+ _ -> field_width(T, W, LL)
end;
-field_width([], W) when W < 40 ->
+field_width([], W, LL) when W < LL - 3 ->
W + 4;
-field_width([], _) ->
- 40.
+field_width([], _, LL) ->
+ LL.
+
+vals([]) -> [];
+vals([{S, _}|L]) -> [S|vals(L)];
+vals([S|L]) -> [S|vals(L)].
+
+leading_dots([], _Len) -> [];
+leading_dots([{H, I}|L], Len) ->
+ [{"..." ++ nthtail(Len, H), I}|leading_dots(L, Len)];
+leading_dots([H|L], Len) ->
+ ["..." ++ nthtail(Len, H)|leading_dots(L, Len)].
longest_common_head([]) ->
no;
diff --git a/lib/stdlib/test/edlin_expand_SUITE.erl b/lib/stdlib/test/edlin_expand_SUITE.erl
index 718d91c6a3..1f694ea549 100644
--- a/lib/stdlib/test/edlin_expand_SUITE.erl
+++ b/lib/stdlib/test/edlin_expand_SUITE.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 2010-2016. All Rights Reserved.
+%% Copyright Ericsson AB 2010-2017. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
@@ -21,7 +21,8 @@
-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1,
init_per_testcase/2, end_per_testcase/2,
init_per_group/2,end_per_group/2]).
--export([normal/1, quoted_fun/1, quoted_module/1, quoted_both/1, erl_1152/1]).
+-export([normal/1, quoted_fun/1, quoted_module/1, quoted_both/1, erl_1152/1,
+ erl_352/1]).
-include_lib("common_test/include/ct.hrl").
@@ -36,7 +37,7 @@ suite() ->
{timetrap,{minutes,1}}].
all() ->
- [normal, quoted_fun, quoted_module, quoted_both, erl_1152].
+ [normal, quoted_fun, quoted_module, quoted_both, erl_1152, erl_352].
groups() ->
[].
@@ -153,6 +154,78 @@ erl_1152(Config) when is_list(Config) ->
"\n"++"foo"++" "++[1089]++_ = do_format(["foo",[1089]]),
ok.
+erl_352(Config) when is_list(Config) ->
+ erl_352_test(3, 3),
+
+ erl_352_test(3, 75),
+ erl_352_test(3, 76, [trailing]),
+ erl_352_test(4, 74),
+ erl_352_test(4, 75, [leading]),
+ erl_352_test(4, 76, [leading, trailing]),
+
+ erl_352_test(75, 3),
+ erl_352_test(76, 3, [leading]),
+ erl_352_test(74, 4),
+ erl_352_test(75, 4, [leading]),
+ erl_352_test(76, 4, [leading]),
+
+ erl_352_test(74, 74, [leading]),
+ erl_352_test(74, 75, [leading]),
+ erl_352_test(74, 76, [leading, trailing]).
+
+erl_352_test(PrefixLen, SuffixLen) ->
+ erl_352_test(PrefixLen, SuffixLen, []).
+
+erl_352_test(PrefixLen, SuffixLen, Dots) ->
+ io:format("\nPrefixLen = ~w, SuffixLen = ~w\n", [PrefixLen, SuffixLen]),
+
+ PrefixM = lists:duplicate(PrefixLen, $p),
+ SuffixM = lists:duplicate(SuffixLen, $s),
+ LM = [PrefixM ++ S ++ SuffixM || S <- ["1", "2"]],
+ StrM = do_format(LM),
+ check_leading(StrM, "", PrefixM, SuffixM, Dots),
+
+ PrefixF = lists:duplicate(PrefixLen, $p),
+ SuffixF = lists:duplicate(SuffixLen-2, $s),
+ LF = [{PrefixF ++ S ++ SuffixF, 1} || S <- ["1", "2"]],
+ StrF = do_format(LF),
+ true = check_leading(StrF, "/1", PrefixF, SuffixF, Dots),
+
+ ok.
+
+check_leading(FormStr, ArityStr, Prefix, Suffix, Dots) ->
+ List = string:tokens(FormStr, "\n "),
+ io:format("~p\n", [List]),
+ true = lists:all(fun(L) -> length(L) < 80 end, List),
+ case lists:member(leading, Dots) of
+ true ->
+ true = lists:all(fun(L) ->
+ {"...", Rest} = lists:split(3, L),
+ check_trailing(Rest, ArityStr,
+ Suffix, Dots)
+ end, List);
+ false ->
+ true = lists:all(fun(L) ->
+ {Prefix, Rest} =
+ lists:split(length(Prefix), L),
+ check_trailing(Rest, ArityStr,
+ Suffix, Dots)
+ end, List)
+ end.
+
+check_trailing([I|Str], ArityStr, Suffix, Dots) ->
+ true = lists:member(I, [$1, $2]),
+ case lists:member(trailing, Dots) of
+ true ->
+ {Rest, "..." ++ ArityStr} =
+ lists:split(length(Str) - (3 + length(ArityStr)), Str),
+ true = lists:prefix(Rest, Suffix);
+ false ->
+ {Rest, ArityStr} =
+ lists:split(length(Str) - length(ArityStr), Str),
+ Rest =:= Suffix
+ end.
+
do_expand(String) ->
edlin_expand:expand(lists:reverse(String)).
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-27 07:28:11 +0000