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author | Raimo Niskanen <raimo@erlang.org> | 2010-12-09 16:28:11 +0100 |
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committer | Raimo Niskanen <raimo@erlang.org> | 2011-03-10 08:37:38 +0100 |
commit | d16aa7f83af727f5495dd4883efb603dc8b941bb (patch) | |
tree | 22db911d07637083e68fca044bf6449f2bc5d865 /lib/stdlib | |
parent | 06c100a28736cfb6a3d8855298bf4be2eec198f6 (diff) | |
download | otp-d16aa7f83af727f5495dd4883efb603dc8b941bb.tar.gz otp-d16aa7f83af727f5495dd4883efb603dc8b941bb.tar.bz2 otp-d16aa7f83af727f5495dd4883efb603dc8b941bb.zip |
Fix ~F.Fs bug, add testcase and improve documentation
Diffstat (limited to 'lib/stdlib')
-rw-r--r-- | lib/stdlib/doc/src/io.xml | 8 | ||||
-rw-r--r-- | lib/stdlib/src/io_lib_format.erl | 42 | ||||
-rw-r--r-- | lib/stdlib/test/io_SUITE.erl | 84 |
3 files changed, 109 insertions, 25 deletions
diff --git a/lib/stdlib/doc/src/io.xml b/lib/stdlib/doc/src/io.xml index efbb1fc078..81fb5cad3d 100644 --- a/lib/stdlib/doc/src/io.xml +++ b/lib/stdlib/doc/src/io.xml @@ -464,9 +464,9 @@ ok</pre> <p>Prints the argument with the <c>string</c> syntax. The argument is, if no Unicode translation modifier is present, an <seealso marker="erts:erlang#iolist_definition">I/O list</seealso>, a binary, or an atom. If the Unicode translation modifier ('t') is in effect, the argument is chardata(), meaning that binaries are in UTF-8. The characters - are printed without quotes. In this format, the printed - argument is truncated to the given precision and field - width.</p> + are printed without quotes. The string is first truncated + by the given precision and then padded and justified + to the given field width. The default precision is the field width.</p> <p>This format can be used for printing any object and truncating the output so it fits a specified field:</p> <pre> @@ -475,6 +475,8 @@ ok</pre> ok 4> <input>io:fwrite("|~10s|~n", [io_lib:write({hey, hey, hey})]).</input> |{hey,hey,h| +5> <input>io:fwrite("|~-10.8s|~n", [io_lib:write({hey, hey, hey})]).</input> +|{hey,hey | ok</pre> <p>A list with integers larger than 255 is considered an error if the Unicode translation modifier is not given:</p> <pre> diff --git a/lib/stdlib/src/io_lib_format.erl b/lib/stdlib/src/io_lib_format.erl index 7c04d78ce8..49a00a4ec7 100644 --- a/lib/stdlib/src/io_lib_format.erl +++ b/lib/stdlib/src/io_lib_format.erl @@ -1,7 +1,7 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 1996-2009. All Rights Reserved. +%% Copyright Ericsson AB 1996-2011. All Rights Reserved. %% %% The contents of this file are subject to the Erlang Public License, %% Version 1.1, (the "License"); you may not use this file except in @@ -558,26 +558,30 @@ iolist_to_chars(B) when is_binary(B) -> string(S, none, _Adj, none, _Pad) -> S; string(S, F, Adj, none, Pad) -> - N = lists:flatlength(S), - if N > F -> flat_trunc(S, F); - N =:= F -> S; - true -> adjust(S, chars(Pad, F-N), Adj) - end; + string_field(S, F, Adj, lists:flatlength(S), Pad); string(S, none, _Adj, P, Pad) -> + string_field(S, P, left, lists:flatlength(S), Pad); +string(S, F, Adj, P, Pad) when F >= P -> N = lists:flatlength(S), - if N > P -> flat_trunc(S, P); - N =:= P -> S; - true -> [S|chars(Pad, P-N)] - end; -string(S, F, Adj, F, Pad) -> - string(S, none, Adj, F, Pad); -string(S, F, Adj, P, Pad) when F > P -> - N = lists:flatlength(S), - if N > P -> adjust(flat_trunc(S, P), chars(Pad, F-P), Adj); - N =:= P -> adjust(S, chars(Pad, F-P), Adj); - true -> adjust([S|chars(Pad, P-N)], chars(Pad, F-P), Adj) + if F > P -> + if N > P -> + adjust(flat_trunc(S, P), chars(Pad, F-P), Adj); + N < P -> + adjust([S|chars(Pad, P-N)], chars(Pad, F-P), Adj); + true -> % N == P + adjust(S, chars(Pad, F-P), Adj) + end; + true -> % F == P + string_field(S, F, Adj, N, Pad) end. +string_field(S, F, _Adj, N, _Pad) when N > F -> + flat_trunc(S, F); +string_field(S, F, Adj, N, Pad) when N < F -> + adjust(S, chars(Pad, F-N), Adj); +string_field(S, _, _, _, _) -> % N == F + S. + %% unprefixed_integer(Int, Field, Adjust, Base, PadChar, Lowercase) %% -> [Char]. @@ -622,8 +626,8 @@ newline(F, right, _P, _Pad) -> chars($\n, F). %% adjust(Data, [], _) -> Data; -adjust(Data, Pad, left) -> [Data,Pad]; -adjust(Data, Pad, right) -> [Pad,Data]. +adjust(Data, Pad, left) -> [Data|Pad]; +adjust(Data, Pad, right) -> [Pad|Data]. %% Flatten and truncate a deep list to at most N elements. diff --git a/lib/stdlib/test/io_SUITE.erl b/lib/stdlib/test/io_SUITE.erl index 497fd3c562..54a98985cd 100644 --- a/lib/stdlib/test/io_SUITE.erl +++ b/lib/stdlib/test/io_SUITE.erl @@ -1,7 +1,7 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 1999-2010. All Rights Reserved. +%% Copyright Ericsson AB 1999-2011. All Rights Reserved. %% %% The contents of this file are subject to the Erlang Public License, %% Version 1.1, (the "License"); you may not use this file except in @@ -27,7 +27,7 @@ otp_6282/1, otp_6354/1, otp_6495/1, otp_6517/1, otp_6502/1, manpage/1, otp_6708/1, otp_7084/1, otp_7421/1, io_lib_collect_line_3_wb/1, cr_whitespace_in_string/1, - io_fread_newlines/1]). + io_fread_newlines/1, otp_8989/1]). %-define(debug, true). @@ -62,7 +62,7 @@ all() -> otp_6282, otp_6354, otp_6495, otp_6517, otp_6502, manpage, otp_6708, otp_7084, otp_7421, io_lib_collect_line_3_wb, cr_whitespace_in_string, - io_fread_newlines]. + io_fread_newlines, otp_8989]. groups() -> []. @@ -1917,3 +1917,81 @@ read_newlines(Fd, Acc, N0) -> eof -> {lists:reverse(Acc),N0} end. + + + +otp_8989(doc) -> + "OTP-8989 io:format for ~F.Ps ignores P in some cases"; +otp_8989(Suite) when is_list(Suite) -> + Hello = "Hello", + ?line " Hello" = fmt("~6.6s", [Hello]), + ?line " Hello" = fmt("~*.6s", [6,Hello]), + ?line " Hello" = fmt("~6.*s", [6,Hello]), + ?line " Hello" = fmt("~*.*s", [6,6,Hello]), + %% + ?line " Hello" = fmt("~6.5s", [Hello]), + ?line " Hello" = fmt("~*.5s", [6,Hello]), + ?line " Hello" = fmt("~6.*s", [5,Hello]), + ?line " Hello" = fmt("~*.*s", [6,5,Hello]), + %% + ?line " Hell" = fmt("~6.4s", [Hello]), + ?line " Hell" = fmt("~*.4s", [6,Hello]), + ?line " Hell" = fmt("~6.*s", [4,Hello]), + ?line " Hell" = fmt("~*.*s", [6,4,Hello]), + %% + ?line "Hello" = fmt("~5.5s", [Hello]), + ?line "Hello" = fmt("~*.5s", [5,Hello]), + ?line "Hello" = fmt("~5.*s", [5,Hello]), + ?line "Hello" = fmt("~*.*s", [5,5,Hello]), + %% + ?line " Hell" = fmt("~5.4s", [Hello]), + ?line " Hell" = fmt("~*.4s", [5,Hello]), + ?line " Hell" = fmt("~5.*s", [4,Hello]), + ?line " Hell" = fmt("~*.*s", [5,4,Hello]), + %% + ?line "Hell" = fmt("~4.4s", [Hello]), + ?line "Hell" = fmt("~*.4s", [4,Hello]), + ?line "Hell" = fmt("~4.*s", [4,Hello]), + ?line "Hell" = fmt("~*.*s", [4,4,Hello]), + %% + ?line " Hel" = fmt("~4.3s", [Hello]), + ?line " Hel" = fmt("~*.3s", [4,Hello]), + ?line " Hel" = fmt("~4.*s", [3,Hello]), + ?line " Hel" = fmt("~*.*s", [4,3,Hello]), + %% + %% + ?line "Hello " = fmt("~-6.6s", [Hello]), + ?line "Hello " = fmt("~*.6s", [-6,Hello]), + ?line "Hello " = fmt("~-6.*s", [6,Hello]), + ?line "Hello " = fmt("~*.*s", [-6,6,Hello]), + %% + ?line "Hello " = fmt("~-6.5s", [Hello]), + ?line "Hello " = fmt("~*.5s", [-6,Hello]), + ?line "Hello " = fmt("~-6.*s", [5,Hello]), + ?line "Hello " = fmt("~*.*s", [-6,5,Hello]), + %% + ?line "Hell " = fmt("~-6.4s", [Hello]), + ?line "Hell " = fmt("~*.4s", [-6,Hello]), + ?line "Hell " = fmt("~-6.*s", [4,Hello]), + ?line "Hell " = fmt("~*.*s", [-6,4,Hello]), + %% + ?line "Hello" = fmt("~-5.5s", [Hello]), + ?line "Hello" = fmt("~*.5s", [-5,Hello]), + ?line "Hello" = fmt("~-5.*s", [5,Hello]), + ?line "Hello" = fmt("~*.*s", [-5,5,Hello]), + %% + ?line "Hell " = fmt("~-5.4s", [Hello]), + ?line "Hell " = fmt("~*.4s", [-5,Hello]), + ?line "Hell " = fmt("~-5.*s", [4,Hello]), + ?line "Hell " = fmt("~*.*s", [-5,4,Hello]), + %% + ?line "Hell" = fmt("~-4.4s", [Hello]), + ?line "Hell" = fmt("~*.4s", [-4,Hello]), + ?line "Hell" = fmt("~-4.*s", [4,Hello]), + ?line "Hell" = fmt("~*.*s", [-4,4,Hello]), + %% + ?line "Hel " = fmt("~-4.3s", [Hello]), + ?line "Hel " = fmt("~*.3s", [-4,Hello]), + ?line "Hel " = fmt("~-4.*s", [3,Hello]), + ?line "Hel " = fmt("~*.*s", [-4,3,Hello]), + ok. |