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|
#! /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 = $_;
$delimiter = substr($_, 0, 1);
while ($pattern !~ /^\s*(.).*\1/s)
{
printf " > " if $infile eq "STDIN";
last if ! ($_ = <$infile>);
printf $outfile "$_" if $infile ne "STDIN";
$pattern .= $_;
}
chomp($pattern);
$pattern =~ s/\s+$//;
# Check that the pattern is valid
eval "\$_ =~ ${pattern}";
if ($@)
{
printf $outfile "Error: $@";
next NEXT_RE;
}
# 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 "");
$_ = eval "\"$_\""; # To get escapes processed
$ok = 0;
eval "if (\$_ =~ ${pattern}) {" .
"\$z = \$&;" .
"\$a = \$1;" .
"\$b = \$2;" .
"\$c = \$3;" .
"\$d = \$4;" .
"\$e = \$5;" .
"\$f = \$6;" .
"\$g = \$7;" .
"\$h = \$8;" .
"\$i = \$9;" .
"\$j = \$10;" .
"\$k = \$11;" .
"\$l = \$12;" .
"\$m = \$13;" .
"\$n = \$14;" .
"\$o = \$15;" .
"\$p = \$16;" .
"\$ok = 1; }";
if ($@)
{
printf $outfile "Error: $@\n";
next NEXT_RE;
}
elsif (!$ok)
{
printf $outfile "No match\n";
}
else
{
@subs = ($z,$a,$b,$c,$d,$e,$f,$g,$h,$i,$j,$k,$l,$m,$n,$o,$p);
$last_printed = 0;
for ($i = 0; $i <= 17; $i++)
{
if ($i == 0 || 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;
}
}
}
}
}
printf $outfile "\n";
# End
|
