Initial class construction
This commit is contained in:
João Narciso
716
Git/usr/bin/core_perl/splain
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716
Git/usr/bin/core_perl/splain
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@ -0,0 +1,716 @@
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#!/usr/bin/perl
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eval 'exec /usr/bin/perl -S $0 ${1+"$@"}'
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if $running_under_some_shell;
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BEGIN { pop @INC if $INC[-1] eq '.' }
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=head1 NAME
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diagnostics, splain - produce verbose warning diagnostics
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=head1 SYNOPSIS
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Using the C<diagnostics> pragma:
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use diagnostics;
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use diagnostics -verbose;
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enable diagnostics;
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disable diagnostics;
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Using the C<splain> standalone filter program:
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perl program 2>diag.out
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splain [-v] [-p] diag.out
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Using diagnostics to get stack traces from a misbehaving script:
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perl -Mdiagnostics=-traceonly my_script.pl
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=head1 DESCRIPTION
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=head2 The C<diagnostics> Pragma
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This module extends the terse diagnostics normally emitted by both the
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perl compiler and the perl interpreter (from running perl with a -w
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switch or C<use warnings>), augmenting them with the more
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explicative and endearing descriptions found in L<perldiag>. Like the
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other pragmata, it affects the compilation phase of your program rather
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than merely the execution phase.
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To use in your program as a pragma, merely invoke
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use diagnostics;
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at the start (or near the start) of your program. (Note
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that this I<does> enable perl's B<-w> flag.) Your whole
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compilation will then be subject(ed :-) to the enhanced diagnostics.
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These still go out B<STDERR>.
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Due to the interaction between runtime and compiletime issues,
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and because it's probably not a very good idea anyway,
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you may not use C<no diagnostics> to turn them off at compiletime.
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However, you may control their behaviour at runtime using the
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disable() and enable() methods to turn them off and on respectively.
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The B<-verbose> flag first prints out the L<perldiag> introduction before
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any other diagnostics. The $diagnostics::PRETTY variable can generate nicer
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escape sequences for pagers.
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Warnings dispatched from perl itself (or more accurately, those that match
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descriptions found in L<perldiag>) are only displayed once (no duplicate
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descriptions). User code generated warnings a la warn() are unaffected,
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allowing duplicate user messages to be displayed.
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This module also adds a stack trace to the error message when perl dies.
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This is useful for pinpointing what
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caused the death. The B<-traceonly> (or
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just B<-t>) flag turns off the explanations of warning messages leaving just
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the stack traces. So if your script is dieing, run it again with
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perl -Mdiagnostics=-traceonly my_bad_script
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to see the call stack at the time of death. By supplying the B<-warntrace>
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(or just B<-w>) flag, any warnings emitted will also come with a stack
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trace.
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=head2 The I<splain> Program
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While apparently a whole nuther program, I<splain> is actually nothing
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more than a link to the (executable) F<diagnostics.pm> module, as well as
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a link to the F<diagnostics.pod> documentation. The B<-v> flag is like
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the C<use diagnostics -verbose> directive.
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The B<-p> flag is like the
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$diagnostics::PRETTY variable. Since you're post-processing with
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I<splain>, there's no sense in being able to enable() or disable() processing.
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Output from I<splain> is directed to B<STDOUT>, unlike the pragma.
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=head1 EXAMPLES
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The following file is certain to trigger a few errors at both
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runtime and compiletime:
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use diagnostics;
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print NOWHERE "nothing\n";
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print STDERR "\n\tThis message should be unadorned.\n";
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warn "\tThis is a user warning";
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print "\nDIAGNOSTIC TESTER: Please enter a <CR> here: ";
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my $a, $b = scalar <STDIN>;
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print "\n";
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print $x/$y;
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If you prefer to run your program first and look at its problem
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afterwards, do this:
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perl -w test.pl 2>test.out
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./splain < test.out
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Note that this is not in general possible in shells of more dubious heritage,
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as the theoretical
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(perl -w test.pl >/dev/tty) >& test.out
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./splain < test.out
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Because you just moved the existing B<stdout> to somewhere else.
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If you don't want to modify your source code, but still have on-the-fly
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warnings, do this:
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exec 3>&1; perl -w test.pl 2>&1 1>&3 3>&- | splain 1>&2 3>&-
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Nifty, eh?
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If you want to control warnings on the fly, do something like this.
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Make sure you do the C<use> first, or you won't be able to get
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at the enable() or disable() methods.
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use diagnostics; # checks entire compilation phase
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print "\ntime for 1st bogus diags: SQUAWKINGS\n";
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print BOGUS1 'nada';
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print "done with 1st bogus\n";
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disable diagnostics; # only turns off runtime warnings
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print "\ntime for 2nd bogus: (squelched)\n";
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print BOGUS2 'nada';
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print "done with 2nd bogus\n";
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enable diagnostics; # turns back on runtime warnings
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print "\ntime for 3rd bogus: SQUAWKINGS\n";
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print BOGUS3 'nada';
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print "done with 3rd bogus\n";
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disable diagnostics;
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print "\ntime for 4th bogus: (squelched)\n";
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print BOGUS4 'nada';
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print "done with 4th bogus\n";
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=head1 INTERNALS
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Diagnostic messages derive from the F<perldiag.pod> file when available at
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runtime. Otherwise, they may be embedded in the file itself when the
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splain package is built. See the F<Makefile> for details.
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If an extant $SIG{__WARN__} handler is discovered, it will continue
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to be honored, but only after the diagnostics::splainthis() function
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(the module's $SIG{__WARN__} interceptor) has had its way with your
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warnings.
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There is a $diagnostics::DEBUG variable you may set if you're desperately
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curious what sorts of things are being intercepted.
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BEGIN { $diagnostics::DEBUG = 1 }
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=head1 BUGS
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Not being able to say "no diagnostics" is annoying, but may not be
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insurmountable.
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The C<-pretty> directive is called too late to affect matters.
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You have to do this instead, and I<before> you load the module.
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BEGIN { $diagnostics::PRETTY = 1 }
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I could start up faster by delaying compilation until it should be
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needed, but this gets a "panic: top_level" when using the pragma form
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in Perl 5.001e.
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While it's true that this documentation is somewhat subserious, if you use
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a program named I<splain>, you should expect a bit of whimsy.
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=head1 AUTHOR
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Tom Christiansen <F<tchrist@mox.perl.com>>, 25 June 1995.
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=cut
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use strict;
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use 5.009001;
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use Carp;
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$Carp::Internal{__PACKAGE__.""}++;
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our $VERSION = '1.36';
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our $DEBUG;
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our $VERBOSE;
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our $PRETTY;
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our $TRACEONLY = 0;
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our $WARNTRACE = 0;
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use Config;
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use Text::Tabs 'expand';
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my $privlib = $Config{privlibexp};
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if ($^O eq 'VMS') {
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require VMS::Filespec;
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$privlib = VMS::Filespec::unixify($privlib);
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}
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my @trypod = (
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"$privlib/pod/perldiag.pod",
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"$privlib/pods/perldiag.pod",
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);
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# handy for development testing of new warnings etc
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unshift @trypod, "./pod/perldiag.pod" if -e "pod/perldiag.pod";
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(my $PODFILE) = ((grep { -e } @trypod), $trypod[$#trypod])[0];
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$DEBUG ||= 0;
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local $| = 1;
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local $_;
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local $.;
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my $standalone;
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my(%HTML_2_Troff, %HTML_2_Latin_1, %HTML_2_ASCII_7);
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CONFIG: {
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our $opt_p = our $opt_d = our $opt_v = our $opt_f = '';
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unless (caller) {
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$standalone++;
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require Getopt::Std;
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Getopt::Std::getopts('pdvf:')
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or die "Usage: $0 [-v] [-p] [-f splainpod]";
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$PODFILE = $opt_f if $opt_f;
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$DEBUG = 2 if $opt_d;
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$VERBOSE = $opt_v;
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$PRETTY = $opt_p;
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}
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if (open(POD_DIAG, '<', $PODFILE)) {
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warn "Happy happy podfile from real $PODFILE\n" if $DEBUG;
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last CONFIG;
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}
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if (caller) {
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INCPATH: {
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for my $file ( (map { "$_/".__PACKAGE__.".pm" } @INC), $0) {
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warn "Checking $file\n" if $DEBUG;
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if (open(POD_DIAG, '<', $file)) {
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while (<POD_DIAG>) {
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next unless
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/^__END__\s*# wish diag dbase were more accessible/;
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print STDERR "podfile is $file\n" if $DEBUG;
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last INCPATH;
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}
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}
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}
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}
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} else {
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print STDERR "podfile is <DATA>\n" if $DEBUG;
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*POD_DIAG = *main::DATA;
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}
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}
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if (eof(POD_DIAG)) {
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die "couldn't find diagnostic data in $PODFILE @INC $0";
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}
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%HTML_2_Troff = (
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'amp' => '&', # ampersand
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'lt' => '<', # left chevron, less-than
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'gt' => '>', # right chevron, greater-than
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'quot' => '"', # double quote
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"Aacute" => "A\\*'", # capital A, acute accent
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# etc
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);
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%HTML_2_Latin_1 = (
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'amp' => '&', # ampersand
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'lt' => '<', # left chevron, less-than
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'gt' => '>', # right chevron, greater-than
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'quot' => '"', # double quote
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"Aacute" => "\xC1" # capital A, acute accent
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# etc
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);
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%HTML_2_ASCII_7 = (
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'amp' => '&', # ampersand
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'lt' => '<', # left chevron, less-than
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'gt' => '>', # right chevron, greater-than
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'quot' => '"', # double quote
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"Aacute" => "A" # capital A, acute accent
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# etc
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);
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our %HTML_Escapes;
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*HTML_Escapes = do {
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if ($standalone) {
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$PRETTY ? \%HTML_2_Latin_1 : \%HTML_2_ASCII_7;
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} else {
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\%HTML_2_Latin_1;
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}
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};
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*THITHER = $standalone ? *STDOUT : *STDERR;
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my %transfmt = ();
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my $transmo = <<EOFUNC;
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sub transmo {
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#local \$^W = 0; # recursive warnings we do NOT need!
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EOFUNC
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my %msg;
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my $over_level = 0; # We look only at =item lines at the first =over level
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{
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print STDERR "FINISHING COMPILATION for $_\n" if $DEBUG;
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local $/ = '';
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local $_;
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my $header;
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my @headers;
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my $for_item;
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my $seen_body;
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while (<POD_DIAG>) {
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sub _split_pod_link {
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$_[0] =~ m'(?:([^|]*)\|)?([^/]*)(?:/("?)(.*)\3)?'s;
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($1,$2,$4);
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}
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unescape();
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if ($PRETTY) {
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sub noop { return $_[0] } # spensive for a noop
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sub bold { my $str =$_[0]; $str =~ s/(.)/$1\b$1/g; return $str; }
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sub italic { my $str = $_[0]; $str =~ s/(.)/_\b$1/g; return $str; }
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s/C<<< (.*?) >>>|C<< (.*?) >>|[BC]<(.*?)>/bold($+)/ges;
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s/[IF]<(.*?)>/italic($1)/ges;
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s/L<(.*?)>/
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my($text,$page,$sect) = _split_pod_link($1);
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defined $text
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? $text
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: defined $sect
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? italic($sect) . ' in ' . italic($page)
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: italic($page)
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/ges;
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s/S<(.*?)>/
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$1
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/ges;
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} else {
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s/C<<< (.*?) >>>|C<< (.*?) >>|[BC]<(.*?)>/$+/gs;
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s/[IF]<(.*?)>/$1/gs;
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s/L<(.*?)>/
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my($text,$page,$sect) = _split_pod_link($1);
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defined $text
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? $text
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: defined $sect
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? qq '"$sect" in $page'
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: $page
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/ges;
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s/S<(.*?)>/
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$1
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/ges;
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}
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unless (/^=/) {
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if (defined $header) {
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if ( $header eq 'DESCRIPTION' &&
|
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( /Optional warnings are enabled/
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|| /Some of these messages are generic./
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) )
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{
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next;
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}
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$_ = expand $_;
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s/^/ /gm;
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$msg{$header} .= $_;
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for my $h(@headers) { $msg{$h} .= $_ }
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++$seen_body;
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||||
undef $for_item;
|
||||
}
|
||||
next;
|
||||
}
|
||||
|
||||
# If we have not come across the body of the description yet, then
|
||||
# the previous header needs to share the same description.
|
||||
if ($seen_body) {
|
||||
@headers = ();
|
||||
}
|
||||
else {
|
||||
push @headers, $header if defined $header;
|
||||
}
|
||||
|
||||
if ( ! s/=item (.*?)\s*\z//s || $over_level != 1) {
|
||||
|
||||
if ( s/=head1\sDESCRIPTION//) {
|
||||
$msg{$header = 'DESCRIPTION'} = '';
|
||||
undef $for_item;
|
||||
}
|
||||
elsif( s/^=for\s+diagnostics\s*\n(.*?)\s*\z// ) {
|
||||
$for_item = $1;
|
||||
}
|
||||
elsif( /^=over\b/ ) {
|
||||
$over_level++;
|
||||
}
|
||||
elsif( /^=back\b/ ) { # Stop processing body here
|
||||
$over_level--;
|
||||
if ($over_level == 0) {
|
||||
undef $header;
|
||||
undef $for_item;
|
||||
$seen_body = 0;
|
||||
next;
|
||||
}
|
||||
}
|
||||
next;
|
||||
}
|
||||
|
||||
if( $for_item ) { $header = $for_item; undef $for_item }
|
||||
else {
|
||||
$header = $1;
|
||||
|
||||
$header =~ s/\n/ /gs; # Allow multi-line headers
|
||||
}
|
||||
|
||||
# strip formatting directives from =item line
|
||||
$header =~ s/[A-Z]<(.*?)>/$1/g;
|
||||
|
||||
# Since we strip "(\.\s*)\n" when we search a warning, strip it here as well
|
||||
$header =~ s/(\.\s*)?$//;
|
||||
|
||||
my @toks = split( /(%l?[dxX]|%[ucp]|%(?:\.\d+)?[fs])/, $header );
|
||||
if (@toks > 1) {
|
||||
my $conlen = 0;
|
||||
for my $i (0..$#toks){
|
||||
if( $i % 2 ){
|
||||
if( $toks[$i] eq '%c' ){
|
||||
$toks[$i] = '.';
|
||||
} elsif( $toks[$i] =~ /^%(?:d|u)$/ ){
|
||||
$toks[$i] = '\d+';
|
||||
} elsif( $toks[$i] =~ '^%(?:s|.*f)$' ){
|
||||
$toks[$i] = $i == $#toks ? '.*' : '.*?';
|
||||
} elsif( $toks[$i] =~ '%.(\d+)s' ){
|
||||
$toks[$i] = ".{$1}";
|
||||
} elsif( $toks[$i] =~ '^%l*([pxX])$' ){
|
||||
$toks[$i] = $1 eq 'X' ? '[\dA-F]+' : '[\da-f]+';
|
||||
}
|
||||
} elsif( length( $toks[$i] ) ){
|
||||
$toks[$i] = quotemeta $toks[$i];
|
||||
$conlen += length( $toks[$i] );
|
||||
}
|
||||
}
|
||||
my $lhs = join( '', @toks );
|
||||
$lhs =~ s/(\\\s)+/\\s+/g; # Replace lit space with multi-space match
|
||||
$transfmt{$header}{pat} =
|
||||
" s^\\s*$lhs\\s*\Q$header\Es\n\t&& return 1;\n";
|
||||
$transfmt{$header}{len} = $conlen;
|
||||
} else {
|
||||
my $lhs = "\Q$header\E";
|
||||
$lhs =~ s/(\\\s)+/\\s+/g; # Replace lit space with multi-space match
|
||||
$transfmt{$header}{pat} =
|
||||
" s^\\s*$lhs\\s*\Q$header\E\n\t && return 1;\n";
|
||||
$transfmt{$header}{len} = length( $header );
|
||||
}
|
||||
|
||||
print STDERR __PACKAGE__.": Duplicate entry: \"$header\"\n"
|
||||
if $msg{$header};
|
||||
|
||||
$msg{$header} = '';
|
||||
$seen_body = 0;
|
||||
}
|
||||
|
||||
|
||||
close POD_DIAG unless *main::DATA eq *POD_DIAG;
|
||||
|
||||
die "No diagnostics?" unless %msg;
|
||||
|
||||
# Apply patterns in order of decreasing sum of lengths of fixed parts
|
||||
# Seems the best way of hitting the right one.
|
||||
for my $hdr ( sort { $transfmt{$b}{len} <=> $transfmt{$a}{len} }
|
||||
keys %transfmt ){
|
||||
$transmo .= $transfmt{$hdr}{pat};
|
||||
}
|
||||
$transmo .= " return 0;\n}\n";
|
||||
print STDERR $transmo if $DEBUG;
|
||||
eval $transmo;
|
||||
die $@ if $@;
|
||||
}
|
||||
|
||||
if ($standalone) {
|
||||
if (!@ARGV and -t STDIN) { print STDERR "$0: Reading from STDIN\n" }
|
||||
while (defined (my $error = <>)) {
|
||||
splainthis($error) || print THITHER $error;
|
||||
}
|
||||
exit;
|
||||
}
|
||||
|
||||
my $olddie;
|
||||
my $oldwarn;
|
||||
|
||||
sub import {
|
||||
shift;
|
||||
$^W = 1; # yup, clobbered the global variable;
|
||||
# tough, if you want diags, you want diags.
|
||||
return if defined $SIG{__WARN__} && ($SIG{__WARN__} eq \&warn_trap);
|
||||
|
||||
for (@_) {
|
||||
|
||||
/^-d(ebug)?$/ && do {
|
||||
$DEBUG++;
|
||||
next;
|
||||
};
|
||||
|
||||
/^-v(erbose)?$/ && do {
|
||||
$VERBOSE++;
|
||||
next;
|
||||
};
|
||||
|
||||
/^-p(retty)?$/ && do {
|
||||
print STDERR "$0: I'm afraid it's too late for prettiness.\n";
|
||||
$PRETTY++;
|
||||
next;
|
||||
};
|
||||
# matches trace and traceonly for legacy doc mixup reasons
|
||||
/^-t(race(only)?)?$/ && do {
|
||||
$TRACEONLY++;
|
||||
next;
|
||||
};
|
||||
/^-w(arntrace)?$/ && do {
|
||||
$WARNTRACE++;
|
||||
next;
|
||||
};
|
||||
|
||||
warn "Unknown flag: $_";
|
||||
}
|
||||
|
||||
$oldwarn = $SIG{__WARN__};
|
||||
$olddie = $SIG{__DIE__};
|
||||
$SIG{__WARN__} = \&warn_trap;
|
||||
$SIG{__DIE__} = \&death_trap;
|
||||
}
|
||||
|
||||
sub enable { &import }
|
||||
|
||||
sub disable {
|
||||
shift;
|
||||
return unless $SIG{__WARN__} eq \&warn_trap;
|
||||
$SIG{__WARN__} = $oldwarn || '';
|
||||
$SIG{__DIE__} = $olddie || '';
|
||||
}
|
||||
|
||||
sub warn_trap {
|
||||
my $warning = $_[0];
|
||||
if (caller eq __PACKAGE__ or !splainthis($warning)) {
|
||||
if ($WARNTRACE) {
|
||||
print STDERR Carp::longmess($warning);
|
||||
} else {
|
||||
print STDERR $warning;
|
||||
}
|
||||
}
|
||||
goto &$oldwarn if defined $oldwarn and $oldwarn and $oldwarn ne \&warn_trap;
|
||||
};
|
||||
|
||||
sub death_trap {
|
||||
my $exception = $_[0];
|
||||
|
||||
# See if we are coming from anywhere within an eval. If so we don't
|
||||
# want to explain the exception because it's going to get caught.
|
||||
my $in_eval = 0;
|
||||
my $i = 0;
|
||||
while (my $caller = (caller($i++))[3]) {
|
||||
if ($caller eq '(eval)') {
|
||||
$in_eval = 1;
|
||||
last;
|
||||
}
|
||||
}
|
||||
|
||||
splainthis($exception) unless $in_eval;
|
||||
if (caller eq __PACKAGE__) {
|
||||
print STDERR "INTERNAL EXCEPTION: $exception";
|
||||
}
|
||||
&$olddie if defined $olddie and $olddie and $olddie ne \&death_trap;
|
||||
|
||||
return if $in_eval;
|
||||
|
||||
# We don't want to unset these if we're coming from an eval because
|
||||
# then we've turned off diagnostics.
|
||||
|
||||
# Switch off our die/warn handlers so we don't wind up in our own
|
||||
# traps.
|
||||
$SIG{__DIE__} = $SIG{__WARN__} = '';
|
||||
|
||||
$exception =~ s/\n(?=.)/\n\t/gas;
|
||||
|
||||
die Carp::longmess("__diagnostics__")
|
||||
=~ s/^__diagnostics__.*?line \d+\.?\n/
|
||||
"Uncaught exception from user code:\n\t$exception"
|
||||
/re;
|
||||
# up we go; where we stop, nobody knows, but i think we die now
|
||||
# but i'm deeply afraid of the &$olddie guy reraising and us getting
|
||||
# into an indirect recursion loop
|
||||
};
|
||||
|
||||
my %exact_duplicate;
|
||||
my %old_diag;
|
||||
my $count;
|
||||
my $wantspace;
|
||||
sub splainthis {
|
||||
return 0 if $TRACEONLY;
|
||||
for (my $tmp = shift) {
|
||||
local $\;
|
||||
local $!;
|
||||
### &finish_compilation unless %msg;
|
||||
s/(\.\s*)?\n+$//;
|
||||
my $orig = $_;
|
||||
# return unless defined;
|
||||
|
||||
# get rid of the where-are-we-in-input part
|
||||
s/, <.*?> (?:line|chunk).*$//;
|
||||
|
||||
# Discard 1st " at <file> line <no>" and all text beyond
|
||||
# but be aware of messages containing " at this-or-that"
|
||||
my $real = 0;
|
||||
my @secs = split( / at / );
|
||||
return unless @secs;
|
||||
$_ = $secs[0];
|
||||
for my $i ( 1..$#secs ){
|
||||
if( $secs[$i] =~ /.+? (?:line|chunk) \d+/ ){
|
||||
$real = 1;
|
||||
last;
|
||||
} else {
|
||||
$_ .= ' at ' . $secs[$i];
|
||||
}
|
||||
}
|
||||
|
||||
# remove parenthesis occurring at the end of some messages
|
||||
s/^\((.*)\)$/$1/;
|
||||
|
||||
if ($exact_duplicate{$orig}++) {
|
||||
return &transmo;
|
||||
} else {
|
||||
return 0 unless &transmo;
|
||||
}
|
||||
|
||||
my $short = shorten($orig);
|
||||
if ($old_diag{$_}) {
|
||||
autodescribe();
|
||||
print THITHER "$short (#$old_diag{$_})\n";
|
||||
$wantspace = 1;
|
||||
} elsif (!$msg{$_} && $orig =~ /\n./s) {
|
||||
# A multiline message, like "Attempt to reload /
|
||||
# Compilation failed"
|
||||
my $found;
|
||||
for (split /^/, $orig) {
|
||||
splainthis($_) and $found = 1;
|
||||
}
|
||||
return $found;
|
||||
} else {
|
||||
autodescribe();
|
||||
$old_diag{$_} = ++$count;
|
||||
print THITHER "\n" if $wantspace;
|
||||
$wantspace = 0;
|
||||
print THITHER "$short (#$old_diag{$_})\n";
|
||||
if ($msg{$_}) {
|
||||
print THITHER $msg{$_};
|
||||
} else {
|
||||
if (0 and $standalone) {
|
||||
print THITHER " **** Error #$old_diag{$_} ",
|
||||
($real ? "is" : "appears to be"),
|
||||
" an unknown diagnostic message.\n\n";
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
sub autodescribe {
|
||||
if ($VERBOSE and not $count) {
|
||||
print THITHER &{$PRETTY ? \&bold : \&noop}("DESCRIPTION OF DIAGNOSTICS"),
|
||||
"\n$msg{DESCRIPTION}\n";
|
||||
}
|
||||
}
|
||||
|
||||
sub unescape {
|
||||
s {
|
||||
E<
|
||||
( [A-Za-z]+ )
|
||||
>
|
||||
} {
|
||||
do {
|
||||
exists $HTML_Escapes{$1}
|
||||
? do { $HTML_Escapes{$1} }
|
||||
: do {
|
||||
warn "Unknown escape: E<$1> in $_";
|
||||
"E<$1>";
|
||||
}
|
||||
}
|
||||
}egx;
|
||||
}
|
||||
|
||||
sub shorten {
|
||||
my $line = $_[0];
|
||||
if (length($line) > 79 and index($line, "\n") == -1) {
|
||||
my $space_place = rindex($line, ' ', 79);
|
||||
if ($space_place != -1) {
|
||||
substr($line, $space_place, 1) = "\n\t";
|
||||
}
|
||||
}
|
||||
return $line;
|
||||
}
|
||||
|
||||
|
||||
1 unless $standalone; # or it'll complain about itself
|
||||
__END__ # wish diag dbase were more accessible
|
||||
Reference in New Issue
Block a user