dumper.pm

perl 解释器

#
# Data/Dumper.pm
#
# convert perl data structures into perl syntax suitable for both printing
# and eval
#
# Documentation at the __END__
#

package Data::Dumper;

$VERSION = $VERSION = '2.09';

#$| = 1;

require 5.004;
require Exporter;
require DynaLoader;
require overload;

use Carp;

@ISA = qw(Exporter DynaLoader);
@EXPORT = qw(Dumper);
@EXPORT_OK = qw(DumperX);

bootstrap Data::Dumper;

# module vars and their defaults
$Indent = 2 unless defined $Indent;
$Purity = 0 unless defined $Purity;
$Pad = "" unless defined $Pad;
$Varname = "VAR" unless defined $Varname;
$Useqq = 0 unless defined $Useqq;
$Terse = 0 unless defined $Terse;
$Freezer = "" unless defined $Freezer;
$Toaster = "" unless defined $Toaster;
$Deepcopy = 0 unless defined $Deepcopy;
$Quotekeys = 1 unless defined $Quotekeys;
$Bless = "bless" unless defined $Bless;
#$Expdepth = 0 unless defined $Expdepth;
#$Maxdepth = 0 unless defined $Maxdepth;

#
# expects an arrayref of values to be dumped.
# can optionally pass an arrayref of names for the values.
# names must have leading $ sign stripped. begin the name with *
# to cause output of arrays and hashes rather than refs.
#
sub new {
  my($c, $v, $n) = @_;

  croak "Usage:  PACKAGE->new(ARRAYREF, [ARRAYREF])" 
    unless (defined($v) && (ref($v) eq 'ARRAY'));
  $n = [] unless (defined($n) && (ref($v) eq 'ARRAY'));

  my($s) = { 
             level      => 0,           # current recursive depth
	     indent     => $Indent,     # various styles of indenting
	     pad	=> $Pad,        # all lines prefixed by this string
	     xpad       => "",          # padding-per-level
	     apad       => "",          # added padding for hash keys n such
	     sep        => "",          # list separator
	     seen       => {},          # local (nested) refs (id => [name, val])
	     todump     => $v,          # values to dump []
	     names      => $n,          # optional names for values []
	     varname    => $Varname,    # prefix to use for tagging nameless ones
             purity     => $Purity,     # degree to which output is evalable
             useqq 	=> $Useqq,      # use "" for strings (backslashitis ensues)
             terse 	=> $Terse,      # avoid name output (where feasible)
             freezer	=> $Freezer,    # name of Freezer method for objects
             toaster	=> $Toaster,    # name of method to revive objects
             deepcopy	=> $Deepcopy,   # dont cross-ref, except to stop recursion
             quotekeys	=> $Quotekeys,  # quote hash keys
             'bless'	=> $Bless,	# keyword to use for "bless"
#	     expdepth   => $Expdepth,   # cutoff depth for explicit dumping
#	     maxdepth	=> $Maxdepth,   # depth beyond which we give up
	   };

  if ($Indent > 0) {
    $s->{xpad} = "  ";
    $s->{sep} = "\n";
  }
  return bless($s, $c);
}

#
# add-to or query the table of already seen references
#
sub Seen {
  my($s, $g) = @_;
  if (defined($g) && (ref($g) eq 'HASH'))  {
    my($k, $v, $id);
    while (($k, $v) = each %$g) {
      if (defined $v and ref $v) {
	($id) = (overload::StrVal($v) =~ /\((.*)\)$/);
	if ($k =~ /^[*](.*)$/) {
	  $k = (ref $v eq 'ARRAY') ? ( "\\\@" . $1 ) :
	       (ref $v eq 'HASH')  ? ( "\\\%" . $1 ) :
	       (ref $v eq 'CODE')  ? ( "\\\&" . $1 ) :
				     (   "\$" . $1 ) ;
	}
	elsif ($k !~ /^\$/) {
	  $k = "\$" . $k;
	}
	$s->{seen}{$id} = [$k, $v];
      }
      else {
	carp "Only refs supported, ignoring non-ref item \$$k";
      }
    }
    return $s;
  }
  else {
    return map { @$_ } values %{$s->{seen}};
  }
}

#
# set or query the values to be dumped
#
sub Values {
  my($s, $v) = @_;
  if (defined($v) && (ref($v) eq 'ARRAY'))  {
    $s->{todump} = [@$v];        # make a copy
    return $s;
  }
  else {
    return @{$s->{todump}};
  }
}

#
# set or query the names of the values to be dumped
#
sub Names {
  my($s, $n) = @_;
  if (defined($n) && (ref($n) eq 'ARRAY'))  {
    $s->{names} = [@$n];         # make a copy
    return $s;
  }
  else {
    return @{$s->{names}};
  }
}

sub DESTROY {}

#
# dump the refs in the current dumper object.
# expects same args as new() if called via package name.
#
sub Dump {
  my($s) = shift;
  my(@out, $val, $name);
  my($i) = 0;
  local(@post);

  $s = $s->new(@_) unless ref $s;

  for $val (@{$s->{todump}}) {
    my $out = "";
    @post = ();
    $name = $s->{names}[$i++];
    if (defined $name) {
      if ($name =~ /^[*](.*)$/) {
	if (defined $val) {
	  $name = (ref $val eq 'ARRAY') ? ( "\@" . $1 ) :
		  (ref $val eq 'HASH')  ? ( "\%" . $1 ) :
		  (ref $val eq 'CODE')  ? ( "\*" . $1 ) :
					  ( "\$" . $1 ) ;
	}
	else {
	  $name = "\$" . $1;
	}
      }
      elsif ($name !~ /^\$/) {
	$name = "\$" . $name;
      }
    }
    else {
      $name = "\$" . $s->{varname} . $i;
    }

    my $valstr;
    {
      local($s->{apad}) = $s->{apad};
      $s->{apad} .= ' ' x (length($name) + 3) if $s->{indent} >= 2;
      $valstr = $s->_dump($val, $name);
    }

    $valstr = "$name = " . $valstr . ';' if @post or !$s->{terse};
    $out .= $s->{pad} . $valstr . $s->{sep};
    $out .= $s->{pad} . join(';' . $s->{sep} . $s->{pad}, @post) 
      . ';' . $s->{sep} if @post;

    push @out, $out;
  }
  return wantarray ? @out : join('', @out);
}

#
# twist, toil and turn;
# and recurse, of course.
#
sub _dump {
  my($s, $val, $name) = @_;
  my($sname);
  my($out, $realpack, $realtype, $type, $ipad, $id, $blesspad);

  return "undef" unless defined $val;

  $type = ref $val;
  $out = "";

  if ($type) {

    # prep it, if it looks like an object
    if ($type =~ /[a-z_:]/) {
      my $freezer = $s->{freezer};
      # UNIVERSAL::can should be used here, when we can require 5.004
      if ($freezer) {
	eval { $val->$freezer() };
	carp "WARNING(Freezer method call failed): $@" if $@;
      }
    }

    ($realpack, $realtype, $id) =
      (overload::StrVal($val) =~ /^(?:(.*)\=)?([^=]*)\(([^\(]*)\)$/);
    
    # keep a tab on it so that we dont fall into recursive pit
    if (exists $s->{seen}{$id}) {
#     if ($s->{expdepth} < $s->{level}) {
      if ($s->{purity} and $s->{level} > 0) {
	$out = ($realtype eq 'HASH')  ? '{}' :
	       ($realtype eq 'ARRAY') ? '[]' :
					"''" ;
	  push @post, $name . " = " . $s->{seen}{$id}[0];
      }
      else {
	$out = $s->{seen}{$id}[0];
	if ($name =~ /^([\@\%])/) {
	  my $start = $1;
	  if ($out =~ /^\\$start/) {
	    $out = substr($out, 1);
	  }
	  else {
	    $out = $start . '{' . $out . '}';
	  }
	}
      }
      return $out;
#     }
    }
    else {
      # store our name
      $s->{seen}{$id} = [ (($name =~ /^[@%]/)     ? ('\\' . $name ) :
			   ($realtype eq 'CODE' and
			    $name =~ /^[*](.*)$/) ? ('\\&' . $1 )   :
						     $name          ),
			  $val ];
    }

    $s->{level}++;
    $ipad = $s->{xpad} x $s->{level};

    if ($realpack) {          # we have a blessed ref
      $out = $s->{'bless'} . '( ';
      $blesspad = $s->{apad};
      $s->{apad} .= '       ' if ($s->{indent} >= 2);
    }
    
    if ($realtype eq 'SCALAR') {
      if ($realpack) {
	$out .= 'do{\\(my $o = ' . $s->_dump($$val, "") . ')}';
      }
      else {
	$out .= '\\' . $s->_dump($$val, "");
      }
    }
    elsif ($realtype eq 'GLOB') {
	$out .= '\\' . $s->_dump($$val, "");
    }
    elsif ($realtype eq 'ARRAY') {
      my($v, $pad, $mname);
      my($i) = 0;
      $out .= ($name =~ /^\@/) ? '(' : '[';
      $pad = $s->{sep} . $s->{pad} . $s->{apad};
      ($name =~ /^\@(.*)$/) ? ($mname = "\$" . $1) : 
	($name =~ /[]}]$/) ? ($mname = $name) : ($mname = $name . '->');
      $mname .= '->' if $mname =~ /^\*.+\{[A-Z]+\}$/;
      for $v (@$val) {
	$sname = $mname . '[' . $i . ']';
	$out .= $pad . $ipad . '#' . $i if $s->{indent} >= 3;
	$out .= $pad . $ipad . $s->_dump($v, $sname);
	$out .= "," if $i++ < $#$val;
      }
      $out .= $pad . ($s->{xpad} x ($s->{level} - 1)) if $i;
      $out .= ($name =~ /^\@/) ? ')' : ']';
    }
    elsif ($realtype eq 'HASH') {
      my($k, $v, $pad, $lpad, $mname);
      $out .= ($name =~ /^\%/) ? '(' : '{';
      $pad = $s->{sep} . $s->{pad} . $s->{apad};
      $lpad = $s->{apad};
      ($name =~ /^\%(.*)$/) ? ($mname = "\$" . $1) : 
	($name =~ /[]}]$/) ? ($mname = $name) : ($mname = $name . '->');
      $mname .= '->' if $mname =~ /^\*.+\{[A-Z]+\}$/;
      while (($k, $v) = each %$val) {
	my $nk = $s->_dump($k, "");
	$nk = $1 if !$s->{quotekeys} and $nk =~ /^[\"\']([A-Za-z_]\w*)[\"\']$/;
	$sname = $mname . '{' . $nk . '}';
	$out .= $pad . $ipad . $nk . " => ";

	# temporarily alter apad
	$s->{apad} .= (" " x (length($nk) + 4)) if $s->{indent} >= 2;
	$out .= $s->_dump($val->{$k}, $sname) . ",";
	$s->{apad} = $lpad if $s->{indent} >= 2;
      }
      if (substr($out, -1) eq ',') {
	chop $out;
	$out .= $pad . ($s->{xpad} x ($s->{level} - 1));
      }
      $out .= ($name =~ /^\%/) ? ')' : '}';
    }
    elsif ($realtype eq 'CODE') {
      $out .= '"DUMMY"';
      $out = 'sub { ' . $out . ' }';
      carp "Encountered CODE ref, using dummy placeholder" if $s->{purity};
    }
    else {
      croak "Can\'t handle $realtype type.";
    }
    
    if ($realpack) { # we have a blessed ref
      $out .= ', \'' . $realpack . '\'' . ' )';
      $out .= '->' . $s->{toaster} . '()'  if $s->{toaster} ne '';
      $s->{apad} = $blesspad;
    }
    $s->{level}--;

  }
  else {                                 # simple scalar

    my $ref = \$_[1];
    # first, catalog the scalar
    if ($name ne '') {
      ($id) = ("$ref" =~ /\(([^\(]*)\)$/);
      if (exists $s->{seen}{$id}) {
	$out = $s->{seen}{$id}[0];
	return $out;
      }
      else {
	$s->{seen}{$id} = ["\\$name", $val];
      }
    }
    if (ref($ref) eq 'GLOB' or "$ref" =~ /=GLOB\([^()]+\)$/) {  # glob
      my $name = substr($val, 1);
      if ($name =~ /^[A-Za-z_][\w:]*$/) {
	$name =~ s/^main::/::/;
	$sname = $name;
      }
      else {
	$sname = $s->_dump($name, "");
	$sname = '{' . $sname . '}';
      }
      if ($s->{purity}) {
	my $k;
	local ($s->{level}) = 0;
	for $k (qw(SCALAR ARRAY HASH)) {
	  # _dump can push into @post, so we hold our place using $postlen
	  my $postlen = scalar @post;
	  $post[$postlen] = "\*$sname = ";
	  local ($s->{apad}) = " " x length($post[$postlen]) if $s->{indent} >= 2;
	  $post[$postlen] .= $s->_dump(*{$name}{$k}, "\*$sname\{$k\}");
	}
      }
      $out .= '*' . $sname;
    }
    elsif ($val =~ /^-?[1-9]\d{0,8}$/) { # safe decimal number
      $out .= $val;
    }
    else {				 # string
      if ($s->{useqq}) {
	$out .= qquote($val);
      }
      else {
	$val =~ s/([\\\'])/\\$1/g;
	$out .= '\'' . $val .  '\'';
      }
    }
  }

  # if we made it this far, $id was added to seen list at current
  # level, so remove it to get deep copies
  delete($s->{seen}{$id}) if $id and $s->{deepcopy};
  return $out;
}
  
#
# non-OO style of earlier version
#
sub Dumper {
  return Data::Dumper->Dump([@_]);
}

#
# same, only calls the XS version
#
sub DumperX {
  return Data::Dumper->Dumpxs([@_], []);
}

sub Dumpf { return Data::Dumper->Dump(@_) }

sub Dumpp { print Data::Dumper->Dump(@_) }

#
# reset the "seen" cache 
#
sub Reset {
  my($s) = shift;
  $s->{seen} = {};
  return $s;
}

sub Indent {
  my($s, $v) = @_;
  if (defined($v)) {
    if ($v == 0) {
      $s->{xpad} = "";
      $s->{sep} = "";
    }
    else {
      $s->{xpad} = "  ";
      $s->{sep} = "\n";
    }
    $s->{indent} = $v;
    return $s;
  }
  else {
    return $s->{indent};
  }
}

sub Pad {
  my($s, $v) = @_;
  defined($v) ? (($s->{pad} = $v), return $s) : $s->{pad};
}

sub Varname {
  my($s, $v) = @_;
  defined($v) ? (($s->{varname} = $v), return $s) : $s->{varname};
}

sub Purity {
  my($s, $v) = @_;
  defined($v) ? (($s->{purity} = $v), return $s) : $s->{purity};
}

sub Useqq {
  my($s, $v) = @_;
  defined($v) ? (($s->{useqq} = $v), return $s) : $s->{useqq};
}

sub Terse {
  my($s, $v) = @_;
  defined($v) ? (($s->{terse} = $v), return $s) : $s->{terse};
}

sub Freezer {
  my($s, $v) = @_;
  defined($v) ? (($s->{freezer} = $v), return $s) : $s->{freezer};
}

sub Toaster {
  my($s, $v) = @_;
  defined($v) ? (($s->{toaster} = $v), return $s) : $s->{toaster};
}

sub Deepcopy {
  my($s, $v) = @_;