package B::Showlex;
-our $VERSION = '1.01';
+our $VERSION = '1.02';
use strict;
use B qw(svref_2object comppadlist class);
showvaluearray("Pad of lexical values for $objname", $valsav);
}
+my ($newlex, $nosp1); # rendering state vars
+
sub newlex { # drop-in for showlex
my ($objname, $names, $vals) = @_;
my @names = $names->ARRAY;
my @vals = $vals->ARRAY;
my $count = @names;
print $walkHandle "$objname Pad has $count entries\n";
- printf $walkHandle "0: %s\n", $names[0]->terse;
+ printf $walkHandle "0: %s\n", $names[0]->terse unless $nosp1;
for (my $i = 1; $i < $count; $i++) {
- printf $walkHandle "$i: %s = %s\n", $names[$i]->terse, $vals[$i]->terse;
+ printf $walkHandle "$i: %s = %s\n", $names[$i]->terse, $vals[$i]->terse
+ unless $nosp1 and $names[$i]->terse =~ /SPECIAL/;
}
}
-my $newlex; # rendering state var
-
sub showlex_obj {
my ($objname, $obj) = @_;
$objname =~ s/^&main::/&/;
}
sub showlex_main {
- showlex("comppadlist", comppadlist->ARRAY);
+ showlex("comppadlist", comppadlist->ARRAY) if !$newlex;
+ newlex ("main", comppadlist->ARRAY) if $newlex;
}
sub compile {
my @args = grep(!/^-/, @_);
for my $o (@options) {
$newlex = 1 if $o eq "-newlex";
+ $nosp1 = 1 if $o eq "-nosp";
}
return \&showlex_main unless @args;
return sub {
+ my $objref;
foreach my $objname (@args) {
- my $objref;
+ next unless $objname; # skip nulls w/o carping
+
if (ref $objname) {
print $walkHandle "B::Showlex::compile($objname)\n";
$objref = $objname;
=head1 SYNOPSIS
- perl -MO=Showlex[,SUBROUTINE] foo.pl
+ perl -MO=Showlex[,-OPTIONS][,SUBROUTINE] foo.pl
=head1 DESCRIPTION
-When a subroutine name is provided in OPTIONS, prints the lexical
-variables used in that subroutine. Otherwise, prints the file-scope
-lexicals in the file.
+When a comma-separated list of subroutine names is given as options, Showlex
+prints the lexical variables used in those subroutines. Otherwise, it prints
+the file-scope lexicals in the file.
+
+=head1 EXAMPLES
+
+Traditional form:
+
+ $ perl -MO=Showlex -e 'my ($i,$j,$k)=(1,"foo")'
+ Pad of lexical names for comppadlist has 4 entries
+ 0: SPECIAL #1 &PL_sv_undef
+ 1: PVNV (0x9db0fb0) $i
+ 2: PVNV (0x9db0f38) $j
+ 3: PVNV (0x9db0f50) $k
+ Pad of lexical values for comppadlist has 5 entries
+ 0: SPECIAL #1 &PL_sv_undef
+ 1: NULL (0x9da4234)
+ 2: NULL (0x9db0f2c)
+ 3: NULL (0x9db0f44)
+ 4: NULL (0x9da4264)
+ -e syntax OK
+
+New-style form:
+
+ $ perl -MO=Showlex,-newlex -e 'my ($i,$j,$k)=(1,"foo")'
+ main Pad has 4 entries
+ 0: SPECIAL #1 &PL_sv_undef
+ 1: PVNV (0xa0c4fb8) "$i" = NULL (0xa0b8234)
+ 2: PVNV (0xa0c4f40) "$j" = NULL (0xa0c4f34)
+ 3: PVNV (0xa0c4f58) "$k" = NULL (0xa0c4f4c)
+ -e syntax OK
+
+New form, no specials, outside O framework:
+
+ $ perl -MB::Showlex -e \
+ 'my ($i,$j,$k)=(1,"foo"); B::Showlex::compile(-newlex,-nosp)->()'
+ main Pad has 4 entries
+ 1: PVNV (0x998ffb0) "$i" = IV (0x9983234) 1
+ 2: PVNV (0x998ff68) "$j" = PV (0x998ff5c) "foo"
+ 3: PVNV (0x998ff80) "$k" = NULL (0x998ff74)
+
+Note that this example shows the values of the lexicals, whereas the other
+examples did not (as they're compile-time only).
+
+=head2 OPTIONS
+
+The C<-newlex> option produces a more readable C<< name => value >> format,
+and is shown in the second example above.
+
+The C<-nosp> option eliminates reporting of SPECIALs, such as C<0: SPECIAL
+#1 &PL_sv_undef> above. Reporting of SPECIALs can sometimes overwhelm
+your declared lexicals.
+
+=head1 SEE ALSO
+
+C<B::Showlex> can also be used outside of the O framework, as in the third
+example. See C<B::Concise> for a fuller explanation of reasons.
+
+=head1 TODO
+
+Some of the reported info, such as hex addresses, is not particularly
+valuable. Other information would be more useful for the typical
+programmer, such as line-numbers, pad-slot reuses, etc.. Given this,
+-newlex isnt a particularly good flag-name.
=head1 AUTHOR
use Config;
use B::Showlex ();
-plan tests => 8;
+plan tests => 15;
my $verbose = @ARGV; # set if ANY ARGS
# v1.01 tests
-my ($na,$nb,$nc); # holds regex-strs
+my ($na,$nb,$nc); # holds regex-strs
+my ($out, $newlex); # output, option-flag
+
sub padrep {
- my $varname = shift;
- return "PVNV \\\(0x[0-9a-fA-F]+\\\) \\$varname\n";
+ my ($varname,$newlex) = @_;
+ return ($newlex)
+ ? 'PVNV \(0x[0-9a-fA-F]+\) "\\'.$varname.'" = '
+ : "PVNV \\\(0x[0-9a-fA-F]+\\\) \\$varname\n";
}
-my $out = runperl ( switches => ["-MO=Showlex"],
- prog => 'my ($a,$b)', stderr => 1 );
-$na = padrep('$a');
-$nb = padrep('$b');
-like ($out, qr/1: $na/ms, 'found $a in "my ($a,$b)"');
-like ($out, qr/2: $nb/ms, 'found $b in "my ($a,$b)"');
+for $newlex ('', '-newlex') {
+
+ $out = runperl ( switches => ["-MO=Showlex,$newlex"],
+ prog => 'my ($a,$b)', stderr => 1 );
+ $na = padrep('$a',$newlex);
+ $nb = padrep('$b',$newlex);
+ like ($out, qr/1: $na/ms, 'found $a in "my ($a,$b)"');
+ like ($out, qr/2: $nb/ms, 'found $b in "my ($a,$b)"');
-print $out if $verbose;
+ print $out if $verbose;
SKIP: {
skip "no perlio in this build", 5
unless $Config::Config{useperlio};
-our $buf = 'arb startval';
-my $ak = B::Showlex::walk_output (\$buf);
-
-my $walker = B::Showlex::compile(sub { my ($foo,$bar) });
-$walker->();
-$na = padrep('$foo');
-$nb = padrep('$bar');
-like ($buf, qr/1: $na/ms, 'found $foo in "sub { my ($foo,$bar) }"');
-like ($buf, qr/2: $nb/ms, 'found $bar in "sub { my ($foo,$bar) }"');
-
-print $buf if $verbose;
-
-$ak = B::Showlex::walk_output (\$buf);
-
-$walker = B::Showlex::compile(sub { my ($scalar,@arr,%hash) });
-$walker->();
-$na = padrep('$scalar');
-$nb = padrep('@arr');
-$nc = padrep('%hash');
-like ($buf, qr/1: $na/ms, 'found $scalar in "sub { my ($scalar,@arr,%hash) }"');
-like ($buf, qr/2: $nb/ms, 'found @arr in "sub { my ($scalar,@arr,%hash) }"');
-like ($buf, qr/3: $nc/ms, 'found %hash in "sub { my ($scalar,@arr,%hash) }"');
-
-print $buf if $verbose;
-
-my $asub = sub {
- my ($self,%props)=@_;
- my $total;
- { # inner block vars
- my (@fib)=(1,2);
- for (my $i=2; $i<10; $i++) {
- $fib[$i] = $fib[$i-2] + $fib[$i-1];
+ our $buf = 'arb startval';
+ my $ak = B::Showlex::walk_output (\$buf);
+
+ my $walker = B::Showlex::compile( $newlex, sub{my($foo,$bar)} );
+ $walker->();
+ $na = padrep('$foo',$newlex);
+ $nb = padrep('$bar',$newlex);
+ like ($buf, qr/1: $na/ms, 'found $foo in "sub { my ($foo,$bar) }"');
+ like ($buf, qr/2: $nb/ms, 'found $bar in "sub { my ($foo,$bar) }"');
+
+ print $buf if $verbose;
+
+ $ak = B::Showlex::walk_output (\$buf);
+
+ my $src = 'sub { my ($scalar,@arr,%hash) }';
+ my $sub = eval $src;
+ $walker = B::Showlex::compile($sub);
+ $walker->();
+ $na = padrep('$scalar',$newlex);
+ $nb = padrep('@arr',$newlex);
+ $nc = padrep('%hash',$newlex);
+ like ($buf, qr/1: $na/ms, 'found $scalar in "'. $src .'"');
+ like ($buf, qr/2: $nb/ms, 'found @arr in "'. $src .'"');
+ like ($buf, qr/3: $nc/ms, 'found %hash in "'. $src .'"');
+
+ print $buf if $verbose;
+
+ # fibonacci function under test
+ my $asub = sub {
+ my ($self,%props)=@_;
+ my $total;
+ { # inner block vars
+ my (@fib)=(1,2);
+ for (my $i=2; $i<10; $i++) {
+ $fib[$i] = $fib[$i-2] + $fib[$i-1];
+ }
+ for my $i(0..10) {
+ $total += $i;
+ }
}
- for my $i(0..10) {
- $total += $i;
- }
- }
-};
-$walker = B::Showlex::compile($asub, '-newlex');
-$walker->();
+ };
+ $walker = B::Showlex::compile($asub, $newlex, -nosp);
+ $walker->();
+ print $buf if $verbose;
-$walker = B::Concise::compile($asub, '-exec');
-$walker->();
-
-
-print $buf if $verbose;
+ $walker = B::Concise::compile($asub, '-exec');
+ $walker->();
}
+}
projects / p5sagit/p5-mst-13.2.git / commitdiff