Workaround for the buggy ("internal compiler error")

[p5sagit/p5-mst-13.2.git] / ext / re / re.pm

diff --git a/ext/re/re.pm b/ext/re/re.pm
index 8b49ca1..3f142d9 100644 (file)
--- a/ext/re/re.pm
+++ b/ext/re/re.pm
@@ -27,6 +27,9 @@ re - Perl pragma to alter regular expression behaviour
     /^(.*)$/s;                    # output debugging info during
                                   #     compile and run time
 
+    use re 'debugcolor';          # same as 'debug', but with colored output
+    ...
+
 (We use $^X in these examples because it's tainted by default.)
 
 =head1 DESCRIPTION
@@ -57,7 +60,11 @@ When C<use re 'debug'> is in effect, perl emits debugging messages when
 compiling and using regular expressions.  The output is the same as that
 obtained by running a C<-DDEBUGGING>-enabled perl interpreter with the
 B<-Dr> switch. It may be quite voluminous depending on the complexity
-of the match.
+of the match.  Using C<debugcolor> instead of C<debug> enables a
+form of output that can be used to get a colorful display on terminals
+that understand termcap color sequences.  Set C<$ENV{PERL_RE_TC}> to a
+comma-separated list of C<termcap> properties to use for highlighting
+strings on/off, pre-point part on/off.  
 See L<perldebug/"Debugging regular expressions"> for additional info.
 
 The directive C<use re 'debug'> is I<not lexically scoped>, as the
@@ -67,11 +74,27 @@ See L<perlmodlib/Pragmatic Modules>.
 
 =cut
 
+# N.B. File::Basename contains a literal for 'taint' as a fallback.  If
+# taint is changed here, File::Basename must be updated as well.
 my %bitmask = (
 taint  => 0x00100000,
 eval   => 0x00200000,
 );
 
+sub setcolor {
+ eval {                                # Ignore errors
+  require Term::Cap;
+
+  my $terminal = Tgetent Term::Cap ({OSPEED => 9600}); # Avoid warning.
+  my $props = $ENV{PERL_RE_TC} || 'md,me,so,se,us,ue';
+  my @props = split /,/, $props;
+  my $colors = join "\t", map {$terminal->Tputs($_,1)} @props;
+
+  $colors =~ s/\0//g;
+  $ENV{PERL_RE_COLORS} = $colors;
+ };
+}
+
 sub bits {
     my $on = shift;
     my $bits = 0;
@@ -80,12 +103,10 @@ sub bits {
        Carp::carp("Useless use of \"re\" pragma");
     }
     foreach my $s (@_){
-      if ($s eq 'debug') {
-         eval <<'EOE';
-           use DynaLoader;
-           @ISA = ('DynaLoader');
-           bootstrap re;
-EOE
+      if ($s eq 'debug' or $s eq 'debugcolor') {
+         setcolor() if $s eq 'debugcolor';
+         require XSLoader;
+         XSLoader::load('re');
          install() if $on;
          uninstall() unless $on;
          next;