| #! /usr/bin/perl |
| |
| # Program for testing regular expressions with perl to check that PCRE handles |
| # them the same. |
| |
| |
| # Function for turning a string into a string of printing chars |
| |
| sub pchars { |
| my($t) = ""; |
| |
| foreach $c (split(//, $_[0])) |
| { |
| if (ord $c >= 32 && ord $c < 127) { $t .= $c; } |
| else { $t .= sprintf("\\x%02x", ord $c); } |
| } |
| $t; |
| } |
| |
| |
| |
| # Read lines from named file or stdin and write to named file or stdout; lines |
| # consist of a regular expression, in delimiters and optionally followed by |
| # options, followed by a set of test data, terminated by an empty line. |
| |
| # Sort out the input and output files |
| |
| if (@ARGV > 0) |
| { |
| open(INFILE, "<$ARGV[0]") || die "Failed to open $ARGV[0]\n"; |
| $infile = "INFILE"; |
| } |
| else { $infile = "STDIN"; } |
| |
| if (@ARGV > 1) |
| { |
| open(OUTFILE, ">$ARGV[1]") || die "Failed to open $ARGV[1]\n"; |
| $outfile = "OUTFILE"; |
| } |
| else { $outfile = "STDOUT"; } |
| |
| printf($outfile "Perl $] Regular Expressions\n\n"); |
| |
| # Main loop |
| |
| NEXT_RE: |
| for (;;) |
| { |
| printf " re> " if $infile eq "STDIN"; |
| last if ! ($_ = <$infile>); |
| printf $outfile "$_" if $infile ne "STDIN"; |
| next if ($_ eq ""); |
| |
| $pattern = $_; |
| |
| while ($pattern !~ /^\s*(.).*\1/s) |
| { |
| printf " > " if $infile eq "STDIN"; |
| last if ! ($_ = <$infile>); |
| printf $outfile "$_" if $infile ne "STDIN"; |
| $pattern .= $_; |
| } |
| |
| chomp($pattern); |
| $pattern =~ s/\s+$//; |
| |
| # The private /+ modifier means "print $' afterwards". We use it |
| # only on the end of patterns to make it easy to chop off here. |
| |
| $showrest = ($pattern =~ s/\+(?=[a-z]*$)//); |
| |
| # Check that the pattern is valid |
| |
| eval "\$_ =~ ${pattern}"; |
| if ($@) |
| { |
| printf $outfile "Error: $@"; |
| 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 PCRE 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 $infile eq "STDIN"; |
| last NEXT_RE if ! ($_ = <$infile>); |
| chomp; |
| printf $outfile "$_\n" if $infile ne "STDIN"; |
| |
| s/\s+$//; |
| s/^\s+//; |
| |
| last if ($_ eq ""); |
| |
| $x = eval "\"$_\""; # To get escapes processed |
| |
| # Empty array for holding results, then do the matching. |
| |
| @subs = (); |
| |
| eval "${cmd} (\$x =~ ${pattern}) {" . |
| "push \@subs,\$&;" . |
| "push \@subs,\$1;" . |
| "push \@subs,\$2;" . |
| "push \@subs,\$3;" . |
| "push \@subs,\$4;" . |
| "push \@subs,\$5;" . |
| "push \@subs,\$6;" . |
| "push \@subs,\$7;" . |
| "push \@subs,\$8;" . |
| "push \@subs,\$9;" . |
| "push \@subs,\$10;" . |
| "push \@subs,\$11;" . |
| "push \@subs,\$12;" . |
| "push \@subs,\$13;" . |
| "push \@subs,\$14;" . |
| "push \@subs,\$15;" . |
| "push \@subs,\$16;" . |
| "push \@subs,\$'; }"; |
| |
| if ($@) |
| { |
| printf $outfile "Error: $@\n"; |
| next NEXT_RE; |
| } |
| elsif (scalar(@subs) == 0) |
| { |
| printf $outfile "No match\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); |
| } |
| } |
| } |
| } |
| |
| printf $outfile "\n"; |
| |
| # End |