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