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Allow multiple modifier characters in io:format control sequences
OTP-14971
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This makes it possible to print unicode atoms at the same time as
suppressing detection of printable lists.
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Make io_lib:unscan_format/1 work with pad char and default precision
OTP-14958
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Improve handling of maps. Addendum to b57e890.
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* maint:
kernel: Correct contracts and a bug in group_history
stdlib: Correct contracts
dialyzer: Optimize handling of a lot of warnings
Conflicts:
lib/kernel/src/erl_boot_server.erl
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The term returned by io_lib:limit_term(Term, Depth) should return
the same string if substituted for Term in
io_lib:format("~P", [Term, Depth]) or io_lib:format("~W", [Term, Depth]).
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The Unicode translation modifier 't' is added to the io:fread/2,3
control sequence 'a'.
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As of the introduction of Unicode characters in atoms, the control
sequences 'w' and 'W' can return non-Latin-1 characters, unless some
measure is taken.
This commit makes sure that '~w' and '~W' always return Latin-1
characters, or bytes, which can be output to ports or written to raw
files.
The Unicode translation modifier 't' is needed to return non-Latin-1
characters.
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* maint:
[xmerl] Remove faulty throws
[xmerl] Fix XML "well-formedness" bug i SAX parser
[xmerl] Correct bug handling multiple documents on a stream
stdlib: Improve pretty-printing of terms with maps
Conflicts:
lib/stdlib/test/io_SUITE.erl
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As of committing this branch maps:fold/3 calls maps:to_list/1, which
means that the time and memory needed for printing maps is not always
proportional to the size of the generated deep list of characters.
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26b59dfe67e introduced support for arbitrary Unicode characters in
atoms. After that commit, it is possible to print any atom with
a "~s" format string:
1> io:format("~s\n", ['спутник']).
спутник
Note that the same text as a string will fail:
2> io:format("~s\n", ["спутник"]).
** exception error: bad argument
in function io:format/3
called as io:format(<0.53.0>,"~s\n",
[[1089,1087,1091,1090,1085,1080,1082]])
Being more permissive for atoms is probably beneficial for io:format/2.
However, for io_lib:format/2, the new behavior breaks this guarantee
in the documentation for io_lib:format/2:
If and only if the Unicode translation modifier is used in
the format string (that is, ~ts or ~tc), the resulting list
can contain characters beyond the ISO Latin-1 character range
(that is, numbers > 255).
The problem is that you can no longer be sure whether io_lib:format/2
will return an iolist that can be successfully passed to a port
or iolist_to_binary/1.
We see three solutions:
1. Keep the new behavior. That means that you can get non-iolist data
when you use ~s for printing an atom, but a 'badarg' when printing
Unicode strings. That is inconsistent, and it delays error detection
if the result is passed to a port or iolist_to_binary/1.
2. Always allow Unicode characters for ~s. That would be incompatible,
because ~s says that any binary is encoded in latin1, while ~ts says
that any binary is encoded in UTF-8. To implement this solution, we
could no longer support latin1 binaries; all binaries would have to
be encoded in UTF-8.
3. Only allow ~s for atoms where all characters are less than 256.
Require ~ts to print atoms such as 'спутник'.
We reject solution 1 because it is slightly incompatible and is
inconsistent.
We reject solution 2 because it too incompatible.
Therefore, this commit implements solution 3.
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In particular, valgrind needs a lot of time for certain tests.
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While we are it, also re-ident the files.
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We want to re-ident the source files after having taken out
all ?line macros. When re-indenting using Emacs, it's important
that comments that should be at the beginning of a line (or
follow the indentation of statements around it) must start with
"%%".
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Either rely on the default 30 minutes timetrap, or set the timeout
using the supported methods in common_test.
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* maint:
io_SUITE: Don't fail on fast computers with rough timers
Fix code_SUITE after test_server change
Set default value for crash_dump_dir
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* bjorn/cuddle-with-tests:
io_SUITE: Don't fail on fast computers with rough timers
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avoid os:cmd as it treats stderr different on windows.
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On a computer which is fast, but with timers with low resolution,
the measured time for an empty queue could be zero, which could
cause the test case to fail.
Add a calibration function to scale up the amount the amount of
work so that the measured time will not be lower than 50 ms.
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As a first step to removing the test_server application as
as its own separate application, change the inclusion of
test_server.hrl to an inclusion of ct.hrl and remove the
inclusion of test_server_line.hrl.
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Move the test for a bad +pc option to its own test case for
cleanliness. Use the os:cmd/1 function to avoid the annyoying
30 seconds time-out in test_server:start_node/3.
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This adds three new functions to io_lib - scan_format/2, unscan_format/1,
and build_text/1 - which expose the parsed form of the format control
sequences to make it possible to easily modify or filter the input to
io_lib:format/2. This can e.g. be used in order to replace unbounded-size
control sequences like ~w or ~p with corresponding depth-limited ~W and ~P
before doing the actual formatting.
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Ensure that the monitor reference is present in all receive clauses, so
that the compiler optimisation kicks in and the run time won't depend on
the length of the message queue of the calling process.
Remove the 'EXIT' clause, as its presence breaks the optimisation, and
that case is handled by the 'DOWN' clause anyway.
The test io_SUITE:io_with_huge_message_queue is an adaptation of
gen_server_SUITE:call_with_huge_message_queue.
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Values for which the precision or field width were too small in io_lib_format
could trigger an infinite loop or crash in term/5.
Reported-by: Richard Carlsson
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Also fixed otp_10302 to test both on a node with +pc unicode and
a node with +pc latin1.
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The modifier 'l' can be used for turning off the string recognition of
~p and ~P.
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Make sure io_lib:fwrite() with a format string including "~ts" does
not crash when given binaries that cannot be interpreted as
UTF-8-encoded strings.
We want to avoid crashes caused by excessive use of the 't' modifier.
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Binaries were pretty printed too often.
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The code related to the introduction of unicode_string() and
unicode_char() has been removed. The types char() and string() have
been extended to include Unicode characters.
In fact char() was changed some time ago; this commit is about
cleaning up the documentation and introduce better names for some
functions.
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Expect modifications, additions and corrections.
There is a kludge in file_io_server and
erl_scan:continuation_location() that's not so pleasing.
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A case clause ordering problem is causing the empty binary to be
printed as <<...>> rather than the correct <<>> when using ~W with a
depth of 1. Add new tests to verify correct behaviour.
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