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perltest.sh
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perltest.sh
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#! /bin/sh
# Script for testing regular expressions with perl to check that PCRE2 handles
# them the same. For testing with different versions of Perl, if the first
# argument is -perl then the second is taken as the Perl command to use, and
# both are then removed. If the next argument is "-w", Perl is called with
# "-w", which turns on its warning mode.
#
# The Perl code has to have "use utf8" and "require Encode" at the start when
# running UTF-8 tests, but *not* for non-utf8 tests. (The "require" would
# actually be OK for non-utf8-tests, but is not always installed, so this way
# the script will always run for these tests.)
#
# The desired effect is achieved by making this a shell script that passes the
# Perl script to Perl through a pipe. If the next argument is "-utf8", a
# suitable prefix is set up.
#
# The remaining arguments, if any, are passed to Perl. They are an input file
# and an output file. If there is one argument, the output is written to
# STDOUT. If Perl receives no arguments, it opens /dev/tty as input, and writes
# output to STDOUT. (I haven't found a way of getting it to use STDIN, because
# of the contorted piping input.)
perl=perl
perlarg=''
prefix=''
if [ $# -gt 1 -a "$1" = "-perl" ] ; then
shift
perl=$1
shift
fi
if [ $# -gt 0 -a "$1" = "-w" ] ; then
perlarg="-w"
shift
fi
if [ $# -gt 0 -a "$1" = "-utf8" ] ; then
prefix="use utf8; require Encode;"
shift
fi
# The Perl script that follows has a similar specification to pcre2test, and so
# can be given identical input, except that input patterns can be followed only
# by Perl's lower case modifiers and certain other pcre2test modifiers that are
# either handled or ignored:
#
# aftertext interpreted as "print $' afterwards"
# afteralltext ignored
# dupnames ignored (Perl always allows)
# jitstack ignored
# mark show mark information
# no_auto_possess ignored
# no_start_optimize insert (??{""}) at pattern start (disables optimizing)
# -no_start_optimize ignored
# subject_literal does not process subjects for escapes
# ucp sets Perl's /u modifier
# utf invoke UTF-8 functionality
#
# Comment lines are ignored. The #pattern command can be used to set modifiers
# that will be added to each subsequent pattern, after any modifiers it may
# already have. NOTE: this is different to pcre2test where #pattern sets
# defaults which can be overridden on individual patterns. The #subject command
# may be used to set or unset a default "mark" modifier for data lines. This is
# the only use of #subject that is supported. The #perltest, #forbid_utf, and
# #newline_default commands, which are needed in the relevant pcre2test files,
# are ignored. Any other #-command is ignored, with a warning message.
#
# The pattern lines should use only / as the delimiter. The other characters
# that pcre2test supports cause problems with this script.
#
# The data lines must not have any pcre2test modifiers. Unless
# "subject_literal" is on the pattern, data lines are processed as
# Perl double-quoted strings, so if they contain " $ or @ characters, these
# have to be escaped. For this reason, all such characters in the
# Perl-compatible testinput1 and testinput4 files are escaped so that they can
# be used for perltest as well as for pcre2test. The output from this script
# should be same as from pcre2test, apart from the initial identifying banner.
#
# The other testinput files are not suitable for feeding to perltest.sh,
# because they make use of the special modifiers that pcre2test uses for
# testing features of PCRE2. Some of these files also contain malformed regular
# expressions, in order to check that PCRE2 diagnoses them correctly.
(echo "$prefix" ; cat <<'PERLEND'
# The alpha assertions currently give warnings even when -w is not specified.
no warnings "experimental::alpha_assertions";
no warnings "experimental::script_run";
# Function for turning a string into a string of printing chars.
sub pchars {
my($t) = "";
if ($utf8)
{
@p = unpack('U*', $_[0]);
foreach $c (@p)
{
if ($c >= 32 && $c < 127) { $t .= chr $c; }
else { $t .= sprintf("\\x{%02x}", $c);
}
}
}
else
{
foreach $c (split(//, $_[0]))
{
if (ord $c >= 32 && ord $c < 127) { $t .= $c; }
else { $t .= sprintf("\\x%02x", ord $c); }
}
}
$t;
}
# Read lines from a named file or stdin and write to a named file or stdout;
# lines consist of a regular expression, in delimiters and optionally followed
# by options, followed by a set of test data, terminated by an empty line.
# Sort out the input and output files
if (@ARGV > 0)
{
open(INFILE, "<$ARGV[0]") || die "Failed to open $ARGV[0]\n";
$infile = "INFILE";
$interact = 0;
}
else
{
open(INFILE, "</dev/tty") || die "Failed to open /dev/tty\n";
$infile = "INFILE";
$interact = 1;
}
if (@ARGV > 1)
{
open(OUTFILE, ">$ARGV[1]") || die "Failed to open $ARGV[1]\n";
$outfile = "OUTFILE";
}
else { $outfile = "STDOUT"; }
printf($outfile "Perl $^V\n\n");
$extra_modifiers = "";
$default_show_mark = 0;
# Main loop
NEXT_RE:
for (;;)
{
printf " re> " if $interact;
last if ! ($_ = <$infile>);
printf $outfile "$_" if ! $interact;
next if ($_ =~ /^\s*$/ || $_ =~ /^#[\s!]/);
# A few of pcre2test's #-commands are supported, or just ignored. Any others
# cause an error.
if ($_ =~ /^#pattern(.*)/)
{
$extra_modifiers = $1;
chomp($extra_modifiers);
$extra_modifiers =~ s/\s+$//;
next;
}
elsif ($_ =~ /^#subject(.*)/)
{
$mod = $1;
chomp($mod);
$mod =~ s/\s+$//;
if ($mod =~ s/(-?)mark,?//)
{
$minus = $1;
$default_show_mark = ($minus =~ /^$/);
}
if ($mod !~ /^\s*$/)
{
printf $outfile "** Warning: \"$mod\" in #subject ignored\n";
}
next;
}
elsif ($_ =~ /^#/)
{
if ($_ !~ /^#newline_default|^#perltest|^#forbid_utf/)
{
printf $outfile "** Warning: #-command ignored: %s", $_;
}
next;
}
$pattern = $_;
while ($pattern !~ /^\s*(.).*\1/s)
{
printf " > " if $interact;
last if ! ($_ = <$infile>);
printf $outfile "$_" if ! $interact;
$pattern .= $_;
}
chomp($pattern);
$pattern =~ s/\s+$//;
# Split the pattern from the modifiers and adjust them as necessary.
$pattern =~ /^\s*((.).*\2)(.*)$/s;
$pat = $1;
$del = $2;
$mod = "$3,$extra_modifiers";
$mod =~ s/^,\s*//;
# The private "aftertext" modifier means "print $' afterwards".
$showrest = ($mod =~ s/aftertext,?//);
# The "subject_literal" modifer disables escapes in subjects.
$subject_literal = ($mod =~ s/subject_literal,?//);
# "allaftertext" is used by pcre2test to print remainders after captures
$mod =~ s/allaftertext,?//;
# Detect utf
$utf8 = $mod =~ s/utf,?//;
# Remove "dupnames".
$mod =~ s/dupnames,?//;
# Remove "jitstack".
$mod =~ s/jitstack=\d+,?//;
# The "mark" modifier requests checking of MARK data */
$show_mark = $default_show_mark | ($mod =~ s/mark,?//);
# "ucp" asks pcre2test to set PCRE2_UCP; change this to /u for Perl
$mod =~ s/ucp,?/u/;
# Remove "no_auto_possess".
$mod =~ s/no_auto_possess,?//;
# Use no_start_optimize (disable PCRE2 start-up optimization) to disable Perl
# optimization by inserting (??{""}) at the start of the pattern. We may
# also encounter -no_start_optimize from a #pattern setting.
$mod =~ s/-no_start_optimize,?//;
if ($mod =~ s/no_start_optimize,?//) { $pat =~ s/$del/$del(??{""})/; }
# Add back retained modifiers and check that the pattern is valid.
$mod =~ s/,//g;
$pattern = "$pat$mod";
eval "\$_ =~ ${pattern}";
if ($@)
{
printf $outfile "Error: $@";
if (! $interact)
{
for (;;)
{
last if ! ($_ = <$infile>);
last if $_ =~ /^\s*$/;
}
}
next NEXT_RE;
}
# If the /g modifier is present, we want to put a loop round the matching;
# otherwise just a single "if".
$cmd = ($pattern =~ /g[a-z]*$/)? "while" : "if";
# If the pattern is actually the null string, Perl uses the most recently
# executed (and successfully compiled) regex is used instead. This is a
# nasty trap for the unwary! The PCRE2 test suite does contain null strings
# in places - if they are allowed through here all sorts of weird and
# unexpected effects happen. To avoid this, we replace such patterns with
# a non-null pattern that has the same effect.
$pattern = "/(?#)/$2" if ($pattern =~ /^(.)\1(.*)$/);
# Read data lines and test them
for (;;)
{
printf "data> " if $interact;
last NEXT_RE if ! ($_ = <$infile>);
chomp;
printf $outfile "%s", "$_\n" if ! $interact;
s/\s+$//; # Remove trailing space
s/^\s+//; # Remove leading space
last if ($_ eq "");
next if $_ =~ /^\\=(?:\s|$)/; # Comment line
if ($subject_literal)
{
$x = $_;
}
else
{
$x = eval "\"$_\""; # To get escapes processed
}
# Empty array for holding results, ensure $REGERROR and $REGMARK are
# unset, then do the matching.
@subs = ();
$pushes = "push \@subs,\$&;" .
"push \@subs,\$1;" .
"push \@subs,\$2;" .
"push \@subs,\$3;" .
"push \@subs,\$4;" .
"push \@subs,\$5;" .
"push \@subs,\$6;" .
"push \@subs,\$7;" .
"push \@subs,\$8;" .
"push \@subs,\$9;" .
"push \@subs,\$10;" .
"push \@subs,\$11;" .
"push \@subs,\$12;" .
"push \@subs,\$13;" .
"push \@subs,\$14;" .
"push \@subs,\$15;" .
"push \@subs,\$16;" .
"push \@subs,\$'; }";
undef $REGERROR;
undef $REGMARK;
eval "${cmd} (\$x =~ ${pattern}) {" . $pushes;
if ($@)
{
printf $outfile "Error: $@\n";
next NEXT_RE;
}
elsif (scalar(@subs) == 0)
{
printf $outfile "No match";
if ($show_mark && defined $REGERROR && $REGERROR != 1)
{ printf $outfile (", mark = %s", &pchars($REGERROR)); }
printf $outfile "\n";
}
else
{
while (scalar(@subs) != 0)
{
printf $outfile (" 0: %s\n", &pchars($subs[0]));
printf $outfile (" 0+ %s\n", &pchars($subs[17])) if $showrest;
$last_printed = 0;
for ($i = 1; $i <= 16; $i++)
{
if (defined $subs[$i])
{
while ($last_printed++ < $i-1)
{ printf $outfile ("%2d: <unset>\n", $last_printed); }
printf $outfile ("%2d: %s\n", $i, &pchars($subs[$i]));
$last_printed = $i;
}
}
splice(@subs, 0, 18);
}
# It seems that $REGMARK is not marked as UTF-8 even when use utf8 is
# set and the input pattern was a UTF-8 string. We can, however, force
# it to be so marked.
if ($show_mark && defined $REGMARK && $REGMARK != 1)
{
$xx = $REGMARK;
$xx = Encode::decode_utf8($xx) if $utf8;
printf $outfile ("MK: %s\n", &pchars($xx));
}
}
}
}
# By closing OUTFILE explicitly, we avoid a Perl warning in -w mode
# "main::OUTFILE" used only once".
close(OUTFILE) if $outfile eq "OUTFILE";
PERLEND
) | $perl $perlarg - $@
# End