Moving old tlperl prior to committing new one

git-svn-id: svn://tug.org/texlive/trunk@21422 c570f23f-e606-0410-a88d-b1316a301751

1 files changed, 0 insertions, 2281 deletions

diff --git a/Master/tlpkg/tlperl/lib/Text/Balanced.pm b/Master/tlpkg/tlperl/lib/Text/Balanced.pm
deleted file mode 100755
index 07d956735c2..00000000000
--- a/Master/tlpkg/tlperl/lib/Text/Balanced.pm
+++ /dev/null
@@ -1,2281 +0,0 @@
-package Text::Balanced;
-
-# EXTRACT VARIOUSLY DELIMITED TEXT SEQUENCES FROM STRINGS.
-# FOR FULL DOCUMENTATION SEE Balanced.pod
-
-use 5.005;
-use strict;
-use Exporter ();
-use SelfLoader;
-
-use vars qw { $VERSION @ISA %EXPORT_TAGS };
-BEGIN {
-	$VERSION     = '2.02';
-	@ISA         = 'Exporter';
-	%EXPORT_TAGS = (
-		ALL => [ qw{
-			&extract_delimited
-			&extract_bracketed
-			&extract_quotelike
-			&extract_codeblock
-			&extract_variable
-			&extract_tagged
-			&extract_multiple
-			&gen_delimited_pat
-			&gen_extract_tagged
-			&delimited_pat
-		} ],
-	);
-}
-
-Exporter::export_ok_tags('ALL');
-
-# PROTOTYPES
-
-sub _match_bracketed($$$$$$);
-sub _match_variable($$);
-sub _match_codeblock($$$$$$$);
-sub _match_quotelike($$$$);
-
-# HANDLE RETURN VALUES IN VARIOUS CONTEXTS
-
-sub _failmsg {
-	my ($message, $pos) = @_;
-	$@ = bless {
-		error => $message,
-		pos   => $pos,
-	}, 'Text::Balanced::ErrorMsg';
-}
-
-sub _fail {
-	my ($wantarray, $textref, $message, $pos) = @_;
-	_failmsg $message, $pos if $message;
-	return (undef, $$textref, undef) if $wantarray;
-	return undef;
-}
-
-sub _succeed {
-	$@ = undef;
-	my ($wantarray,$textref) = splice @_, 0, 2;
-	my ($extrapos, $extralen) = @_ > 18
-		? splice(@_, -2, 2)
-		: (0, 0);
-	my ($startlen, $oppos) = @_[5,6];
-	my $remainderpos = $_[2];
-	if ( $wantarray ) {
-		my @res;
-		while (my ($from, $len) = splice @_, 0, 2) {
-			push @res, substr($$textref, $from, $len);
-		}
-		if ( $extralen ) { # CORRECT FILLET
-			my $extra = substr($res[0], $extrapos-$oppos, $extralen, "\n");
-			$res[1] = "$extra$res[1]";
-			eval { substr($$textref,$remainderpos,0) = $extra;
-			       substr($$textref,$extrapos,$extralen,"\n")} ;
-				#REARRANGE HERE DOC AND FILLET IF POSSIBLE
-			pos($$textref) = $remainderpos-$extralen+1; # RESET \G
-		} else {
-			pos($$textref) = $remainderpos;		    # RESET \G
-		}
-		return @res;
-	} else {
-		my $match = substr($$textref,$_[0],$_[1]);
-		substr($match,$extrapos-$_[0]-$startlen,$extralen,"") if $extralen;
-		my $extra = $extralen
-			? substr($$textref, $extrapos, $extralen)."\n" : "";
-		eval {substr($$textref,$_[4],$_[1]+$_[5])=$extra} ;	#CHOP OUT PREFIX & MATCH, IF POSSIBLE
-		pos($$textref) = $_[4];				# RESET \G
-		return $match;
-	}
-}
-
-# BUILD A PATTERN MATCHING A SIMPLE DELIMITED STRING
-
-sub gen_delimited_pat($;$)  # ($delimiters;$escapes)
-{
-	my ($dels, $escs) = @_;
-	return "" unless $dels =~ /\S/;
-	$escs = '\\' unless $escs;
-	$escs .= substr($escs,-1) x (length($dels)-length($escs));
-	my @pat = ();
-	my $i;
-	for ($i=0; $i<length $dels; $i++)
-	{
-		my $del = quotemeta substr($dels,$i,1);
-		my $esc = quotemeta substr($escs,$i,1);
-		if ($del eq $esc)
-		{
-			push @pat, "$del(?:[^$del]*(?:(?:$del$del)[^$del]*)*)$del";
-		}
-		else
-		{
-			push @pat, "$del(?:[^$esc$del]*(?:$esc.[^$esc$del]*)*)$del";
-		}
-	}
-	my $pat = join '|', @pat;
-	return "(?:$pat)";
-}
-
-*delimited_pat = \&gen_delimited_pat;
-
-# THE EXTRACTION FUNCTIONS
-
-sub extract_delimited (;$$$$)
-{
-	my $textref = defined $_[0] ? \$_[0] : \$_;
-	my $wantarray = wantarray;
-	my $del  = defined $_[1] ? $_[1] : qq{\'\"\`};
-	my $pre  = defined $_[2] ? $_[2] : '\s*';
-	my $esc  = defined $_[3] ? $_[3] : qq{\\};
-	my $pat = gen_delimited_pat($del, $esc);
-	my $startpos = pos $$textref || 0;
-	return _fail($wantarray, $textref, "Not a delimited pattern", 0)
-		unless $$textref =~ m/\G($pre)($pat)/gc;
-	my $prelen = length($1);
-	my $matchpos = $startpos+$prelen;
-	my $endpos = pos $$textref;
-	return _succeed $wantarray, $textref,
-			$matchpos, $endpos-$matchpos,		# MATCH
-			$endpos,   length($$textref)-$endpos,	# REMAINDER
-			$startpos, $prelen;			# PREFIX
-}
-
-sub extract_bracketed (;$$$)
-{
-	my $textref = defined $_[0] ? \$_[0] : \$_;
-	my $ldel = defined $_[1] ? $_[1] : '{([<';
-	my $pre  = defined $_[2] ? $_[2] : '\s*';
-	my $wantarray = wantarray;
-	my $qdel = "";
-	my $quotelike;
-	$ldel =~ s/'//g and $qdel .= q{'};
-	$ldel =~ s/"//g and $qdel .= q{"};
-	$ldel =~ s/`//g and $qdel .= q{`};
-	$ldel =~ s/q//g and $quotelike = 1;
-	$ldel =~ tr/[](){}<>\0-\377/[[(({{<</ds;
-	my $rdel = $ldel;
-	unless ($rdel =~ tr/[({</])}>/)
-        {
-		return _fail $wantarray, $textref,
-			     "Did not find a suitable bracket in delimiter: \"$_[1]\"",
-			     0;
-	}
-	my $posbug = pos;
-	$ldel = join('|', map { quotemeta $_ } split('', $ldel));
-	$rdel = join('|', map { quotemeta $_ } split('', $rdel));
-	pos = $posbug;
-
-	my $startpos = pos $$textref || 0;
-	my @match = _match_bracketed($textref,$pre, $ldel, $qdel, $quotelike, $rdel);
-
-	return _fail ($wantarray, $textref) unless @match;
-
-	return _succeed ( $wantarray, $textref,
-			  $match[2], $match[5]+2,	# MATCH
-			  @match[8,9],			# REMAINDER
-			  @match[0,1],			# PREFIX
-			);
-}
-
-sub _match_bracketed($$$$$$)	# $textref, $pre, $ldel, $qdel, $quotelike, $rdel
-{
-	my ($textref, $pre, $ldel, $qdel, $quotelike, $rdel) = @_;
-	my ($startpos, $ldelpos, $endpos) = (pos $$textref = pos $$textref||0);
-	unless ($$textref =~ m/\G$pre/gc)
-	{
-		_failmsg "Did not find prefix: /$pre/", $startpos;
-		return;
-	}
-
-	$ldelpos = pos $$textref;
-
-	unless ($$textref =~ m/\G($ldel)/gc)
-	{
-		_failmsg "Did not find opening bracket after prefix: \"$pre\"",
-		         pos $$textref;
-		pos $$textref = $startpos;
-		return;
-	}
-
-	my @nesting = ( $1 );
-	my $textlen = length $$textref;
-	while (pos $$textref < $textlen)
-	{
-		next if $$textref =~ m/\G\\./gcs;
-
-		if ($$textref =~ m/\G($ldel)/gc)
-		{
-			push @nesting, $1;
-		}
-		elsif ($$textref =~ m/\G($rdel)/gc)
-		{
-			my ($found, $brackettype) = ($1, $1);
-			if ($#nesting < 0)
-			{
-				_failmsg "Unmatched closing bracket: \"$found\"",
-					 pos $$textref;
-				pos $$textref = $startpos;
-			        return;
-			}
-			my $expected = pop(@nesting);
-			$expected =~ tr/({[</)}]>/;
-			if ($expected ne $brackettype)
-			{
-				_failmsg qq{Mismatched closing bracket: expected "$expected" but found "$found"},
-					 pos $$textref;
-				pos $$textref = $startpos;
-			        return;
-			}
-			last if $#nesting < 0;
-		}
-		elsif ($qdel && $$textref =~ m/\G([$qdel])/gc)
-		{
-			$$textref =~ m/\G[^\\$1]*(?:\\.[^\\$1]*)*(\Q$1\E)/gsc and next;
-			_failmsg "Unmatched embedded quote ($1)",
-				 pos $$textref;
-			pos $$textref = $startpos;
-			return;
-		}
-		elsif ($quotelike && _match_quotelike($textref,"",1,0))
-		{
-			next;
-		}
-
-		else { $$textref =~ m/\G(?:[a-zA-Z0-9]+|.)/gcs }
-	}
-	if ($#nesting>=0)
-	{
-		_failmsg "Unmatched opening bracket(s): "
-				. join("..",@nesting)."..",
-		         pos $$textref;
-		pos $$textref = $startpos;
-		return;
-	}
-
-	$endpos = pos $$textref;
-	
-	return (
-		$startpos,  $ldelpos-$startpos,		# PREFIX
-		$ldelpos,   1,				# OPENING BRACKET
-		$ldelpos+1, $endpos-$ldelpos-2,		# CONTENTS
-		$endpos-1,  1,				# CLOSING BRACKET
-		$endpos,    length($$textref)-$endpos,	# REMAINDER
-	       );
-}
-
-sub _revbracket($)
-{
-	my $brack = reverse $_[0];
-	$brack =~ tr/[({</])}>/;
-	return $brack;
-}
-
-my $XMLNAME = q{[a-zA-Z_:][a-zA-Z0-9_:.-]*};
-
-sub extract_tagged (;$$$$$) # ($text, $opentag, $closetag, $pre, \%options)
-{
-	my $textref = defined $_[0] ? \$_[0] : \$_;
-	my $ldel    = $_[1];
-	my $rdel    = $_[2];
-	my $pre     = defined $_[3] ? $_[3] : '\s*';
-	my %options = defined $_[4] ? %{$_[4]} : ();
-	my $omode   = defined $options{fail} ? $options{fail} : '';
-	my $bad     = ref($options{reject}) eq 'ARRAY' ? join('|', @{$options{reject}})
-		    : defined($options{reject})	       ? $options{reject}
-		    :					 ''
-		    ;
-	my $ignore  = ref($options{ignore}) eq 'ARRAY' ? join('|', @{$options{ignore}})
-		    : defined($options{ignore})	       ? $options{ignore}
-		    :					 ''
-		    ;
-
-	if (!defined $ldel) { $ldel = '<\w+(?:' . gen_delimited_pat(q{'"}) . '|[^>])*>'; }
-	$@ = undef;
-
-	my @match = _match_tagged($textref, $pre, $ldel, $rdel, $omode, $bad, $ignore);
-
-	return _fail(wantarray, $textref) unless @match;
-	return _succeed wantarray, $textref,
-			$match[2], $match[3]+$match[5]+$match[7],	# MATCH
-			@match[8..9,0..1,2..7];				# REM, PRE, BITS
-}
-
-sub _match_tagged	# ($$$$$$$)
-{
-	my ($textref, $pre, $ldel, $rdel, $omode, $bad, $ignore) = @_;
-	my $rdelspec;
-
-	my ($startpos, $opentagpos, $textpos, $parapos, $closetagpos, $endpos) = ( pos($$textref) = pos($$textref)||0 );
-
-	unless ($$textref =~ m/\G($pre)/gc)
-	{
-		_failmsg "Did not find prefix: /$pre/", pos $$textref;
-		goto failed;
-	}
-
-	$opentagpos = pos($$textref);
-
-	unless ($$textref =~ m/\G$ldel/gc)
-	{
-		_failmsg "Did not find opening tag: /$ldel/", pos $$textref;
-		goto failed;
-	}
-
-	$textpos = pos($$textref);
-
-	if (!defined $rdel)
-	{
-		$rdelspec = substr($$textref, $-[0], $+[0] - $-[0]);
-		unless ($rdelspec =~ s/\A([[(<{]+)($XMLNAME).*/ quotemeta "$1\/$2". _revbracket($1) /oes)
-		{
-			_failmsg "Unable to construct closing tag to match: $rdel",
-				 pos $$textref;
-			goto failed;
-		}
-	}
-	else
-	{
-		$rdelspec = eval "qq{$rdel}" || do {
-			my $del;
-			for (qw,~ ! ^ & * ) _ + - = } ] : " ; ' > . ? / | ',)
-				{ next if $rdel =~ /\Q$_/; $del = $_; last }
-			unless ($del) {
-				use Carp;
-				croak "Can't interpolate right delimiter $rdel"
-			}
-			eval "qq$del$rdel$del";
-		};
-	}
-
-	while (pos($$textref) < length($$textref))
-	{
-		next if $$textref =~ m/\G\\./gc;
-
-		if ($$textref =~ m/\G(\n[ \t]*\n)/gc )
-		{
-			$parapos = pos($$textref) - length($1)
-				unless defined $parapos;
-		}
-		elsif ($$textref =~ m/\G($rdelspec)/gc )
-		{
-			$closetagpos = pos($$textref)-length($1);
-			goto matched;
-		}
-		elsif ($ignore && $$textref =~ m/\G(?:$ignore)/gc)
-		{
-			next;
-		}
-		elsif ($bad && $$textref =~ m/\G($bad)/gcs)
-		{
-			pos($$textref) -= length($1);	# CUT OFF WHATEVER CAUSED THE SHORTNESS
-			goto short if ($omode eq 'PARA' || $omode eq 'MAX');
-			_failmsg "Found invalid nested tag: $1", pos $$textref;
-			goto failed;
-		}
-		elsif ($$textref =~ m/\G($ldel)/gc)
-		{
-			my $tag = $1;
-			pos($$textref) -= length($tag);	# REWIND TO NESTED TAG
-			unless (_match_tagged(@_))	# MATCH NESTED TAG
-			{
-				goto short if $omode eq 'PARA' || $omode eq 'MAX';
-				_failmsg "Found unbalanced nested tag: $tag",
-					 pos $$textref;
-				goto failed;
-			}
-		}
-		else { $$textref =~ m/./gcs }
-	}
-
-short:
-	$closetagpos = pos($$textref);
-	goto matched if $omode eq 'MAX';
-	goto failed unless $omode eq 'PARA';
-
-	if (defined $parapos) { pos($$textref) = $parapos }
-	else		      { $parapos = pos($$textref) }
-
-	return (
-		$startpos,    $opentagpos-$startpos,		# PREFIX
-		$opentagpos,  $textpos-$opentagpos,		# OPENING TAG
-		$textpos,     $parapos-$textpos,		# TEXT
-		$parapos,     0,				# NO CLOSING TAG
-		$parapos,     length($$textref)-$parapos,	# REMAINDER
-	       );
-	
-matched:
-	$endpos = pos($$textref);
-	return (
-		$startpos,    $opentagpos-$startpos,		# PREFIX
-		$opentagpos,  $textpos-$opentagpos,		# OPENING TAG
-		$textpos,     $closetagpos-$textpos,		# TEXT
-		$closetagpos, $endpos-$closetagpos,		# CLOSING TAG
-		$endpos,      length($$textref)-$endpos,	# REMAINDER
-	       );
-
-failed:
-	_failmsg "Did not find closing tag", pos $$textref unless $@;
-	pos($$textref) = $startpos;
-	return;
-}
-
-sub extract_variable (;$$)
-{
-	my $textref = defined $_[0] ? \$_[0] : \$_;
-	return ("","","") unless defined $$textref;
-	my $pre  = defined $_[1] ? $_[1] : '\s*';
-
-	my @match = _match_variable($textref,$pre);
-
-	return _fail wantarray, $textref unless @match;
-
-	return _succeed wantarray, $textref,
-			@match[2..3,4..5,0..1];		# MATCH, REMAINDER, PREFIX
-}
-
-sub _match_variable($$)
-{
-#  $#
-#  $^
-#  $$
-	my ($textref, $pre) = @_;
-	my $startpos = pos($$textref) = pos($$textref)||0;
-	unless ($$textref =~ m/\G($pre)/gc)
-	{
-		_failmsg "Did not find prefix: /$pre/", pos $$textref;
-		return;
-	}
-	my $varpos = pos($$textref);
-        unless ($$textref =~ m{\G\$\s*(?!::)(\d+|[][&`'+*./|,";%=~:?!\@<>()-]|\^[a-z]?)}gci)
-	{
-	    unless ($$textref =~ m/\G((\$#?|[*\@\%]|\\&)+)/gc)
-	    {
-		_failmsg "Did not find leading dereferencer", pos $$textref;
-		pos $$textref = $startpos;
-		return;
-	    }
-	    my $deref = $1;
-
-	    unless ($$textref =~ m/\G\s*(?:::|')?(?:[_a-z]\w*(?:::|'))*[_a-z]\w*/gci
-	    	or _match_codeblock($textref, "", '\{', '\}', '\{', '\}', 0)
-		or $deref eq '$#' or $deref eq '$$' )
-	    {
-		_failmsg "Bad identifier after dereferencer", pos $$textref;
-		pos $$textref = $startpos;
-		return;
-	    }
-	}
-
-	while (1)
-	{
-		next if $$textref =~ m/\G\s*(?:->)?\s*[{]\w+[}]/gc;
-		next if _match_codeblock($textref,
-					 qr/\s*->\s*(?:[_a-zA-Z]\w+\s*)?/,
-					 qr/[({[]/, qr/[)}\]]/,
-					 qr/[({[]/, qr/[)}\]]/, 0);
-		next if _match_codeblock($textref,
-					 qr/\s*/, qr/[{[]/, qr/[}\]]/,
-					 qr/[{[]/, qr/[}\]]/, 0);
-		next if _match_variable($textref,'\s*->\s*');
-		next if $$textref =~ m/\G\s*->\s*\w+(?![{([])/gc;
-		last;
-	}
-	
-	my $endpos = pos($$textref);
-	return ($startpos, $varpos-$startpos,
-		$varpos,   $endpos-$varpos,
-		$endpos,   length($$textref)-$endpos
-		);
-}
-
-sub extract_codeblock (;$$$$$)
-{
-	my $textref = defined $_[0] ? \$_[0] : \$_;
-	my $wantarray = wantarray;
-	my $ldel_inner = defined $_[1] ? $_[1] : '{';
-	my $pre        = defined $_[2] ? $_[2] : '\s*';
-	my $ldel_outer = defined $_[3] ? $_[3] : $ldel_inner;
-	my $rd         = $_[4];
-	my $rdel_inner = $ldel_inner;
-	my $rdel_outer = $ldel_outer;
-	my $posbug = pos;
-	for ($ldel_inner, $ldel_outer) { tr/[]()<>{}\0-\377/[[((<<{{/ds }
-	for ($rdel_inner, $rdel_outer) { tr/[]()<>{}\0-\377/]]))>>}}/ds }
-	for ($ldel_inner, $ldel_outer, $rdel_inner, $rdel_outer)
-	{
-		$_ = '('.join('|',map { quotemeta $_ } split('',$_)).')'
-	}
-	pos = $posbug;
-
-	my @match = _match_codeblock($textref, $pre,
-				     $ldel_outer, $rdel_outer,
-				     $ldel_inner, $rdel_inner,
-				     $rd);
-	return _fail($wantarray, $textref) unless @match;
-	return _succeed($wantarray, $textref,
-			@match[2..3,4..5,0..1]	# MATCH, REMAINDER, PREFIX
-		       );
-
-}
-
-sub _match_codeblock($$$$$$$)
-{
-	my ($textref, $pre, $ldel_outer, $rdel_outer, $ldel_inner, $rdel_inner, $rd) = @_;
-	my $startpos = pos($$textref) = pos($$textref) || 0;
-	unless ($$textref =~ m/\G($pre)/gc)
-	{
-		_failmsg qq{Did not match prefix /$pre/ at"} .
-			    substr($$textref,pos($$textref),20) .
-			    q{..."},
-		         pos $$textref;
-		return; 
-	}
-	my $codepos = pos($$textref);
-	unless ($$textref =~ m/\G($ldel_outer)/gc)	# OUTERMOST DELIMITER
-	{
-		_failmsg qq{Did not find expected opening bracket at "} .
-			     substr($$textref,pos($$textref),20) .
-			     q{..."},
-		         pos $$textref;
-		pos $$textref = $startpos;
-		return;
-	}
-	my $closing = $1;
-	   $closing =~ tr/([<{/)]>}/;
-	my $matched;
-	my $patvalid = 1;
-	while (pos($$textref) < length($$textref))
-	{
-		$matched = '';
-		if ($rd && $$textref =~ m#\G(\Q(?)\E|\Q(s?)\E|\Q(s)\E)#gc)
-		{
-			$patvalid = 0;
-			next;
-		}
-
-		if ($$textref =~ m/\G\s*#.*/gc)
-		{
-			next;
-		}
-
-		if ($$textref =~ m/\G\s*($rdel_outer)/gc)
-		{
-			unless ($matched = ($closing && $1 eq $closing) )
-			{
-				next if $1 eq '>';	# MIGHT BE A "LESS THAN"
-				_failmsg q{Mismatched closing bracket at "} .
-					     substr($$textref,pos($$textref),20) .
-					     qq{...". Expected '$closing'},
-					 pos $$textref;
-			}
-			last;
-		}
-
-		if (_match_variable($textref,'\s*') ||
-		    _match_quotelike($textref,'\s*',$patvalid,$patvalid) )
-		{
-			$patvalid = 0;
-			next;
-		}
-
-
-		# NEED TO COVER MANY MORE CASES HERE!!!
-		if ($$textref =~ m#\G\s*(?!$ldel_inner)
-					( [-+*x/%^&|.]=?
-					| [!=]~
-					| =(?!>)
-					| (\*\*|&&|\|\||<<|>>)=?
-					| split|grep|map|return
-					| [([]
-					)#gcx)
-		{
-			$patvalid = 1;
-			next;
-		}
-
-		if ( _match_codeblock($textref, '\s*', $ldel_inner, $rdel_inner, $ldel_inner, $rdel_inner, $rd) )
-		{
-			$patvalid = 1;
-			next;
-		}
-
-		if ($$textref =~ m/\G\s*$ldel_outer/gc)
-		{
-			_failmsg q{Improperly nested codeblock at "} .
-				     substr($$textref,pos($$textref),20) .
-				     q{..."},
-				 pos $$textref;
-			last;
-		}
-
-		$patvalid = 0;
-		$$textref =~ m/\G\s*(\w+|[-=>]>|.|\Z)/gc;
-	}
-	continue { $@ = undef }
-
-	unless ($matched)
-	{
-		_failmsg 'No match found for opening bracket', pos $$textref
-			unless $@;
-		return;
-	}
-
-	my $endpos = pos($$textref);
-	return ( $startpos, $codepos-$startpos,
-		 $codepos, $endpos-$codepos,
-		 $endpos,  length($$textref)-$endpos,
-	       );
-}
-
-
-my %mods   = (
-		'none'	=> '[cgimsox]*',
-		'm'	=> '[cgimsox]*',
-		's'	=> '[cegimsox]*',
-		'tr'	=> '[cds]*',
-		'y'	=> '[cds]*',
-		'qq'	=> '',
-		'qx'	=> '',
-		'qw'	=> '',
-		'qr'	=> '[imsx]*',
-		'q'	=> '',
-	     );
-
-sub extract_quotelike (;$$)
-{
-	my $textref = $_[0] ? \$_[0] : \$_;
-	my $wantarray = wantarray;
-	my $pre  = defined $_[1] ? $_[1] : '\s*';
-
-	my @match = _match_quotelike($textref,$pre,1,0);
-	return _fail($wantarray, $textref) unless @match;
-	return _succeed($wantarray, $textref,
-			$match[2], $match[18]-$match[2],	# MATCH
-			@match[18,19],				# REMAINDER
-			@match[0,1],				# PREFIX
-			@match[2..17],				# THE BITS
-			@match[20,21],				# ANY FILLET?
-		       );
-};
-
-sub _match_quotelike($$$$)	# ($textref, $prepat, $allow_raw_match)
-{
-	my ($textref, $pre, $rawmatch, $qmark) = @_;
-
-	my ($textlen,$startpos,
-	    $oppos,
-	    $preld1pos,$ld1pos,$str1pos,$rd1pos,
-	    $preld2pos,$ld2pos,$str2pos,$rd2pos,
-	    $modpos) = ( length($$textref), pos($$textref) = pos($$textref) || 0 );
-
-	unless ($$textref =~ m/\G($pre)/gc)
-	{
-		_failmsg qq{Did not find prefix /$pre/ at "} .
-			     substr($$textref, pos($$textref), 20) .
-			     q{..."},
-		         pos $$textref;
-		return; 
-	}
-	$oppos = pos($$textref);
-
-	my $initial = substr($$textref,$oppos,1);
-
-	if ($initial && $initial =~ m|^[\"\'\`]|
-		     || $rawmatch && $initial =~ m|^/|
-		     || $qmark && $initial =~ m|^\?|)
-	{
-		unless ($$textref =~ m/ \Q$initial\E [^\\$initial]* (\\.[^\\$initial]*)* \Q$initial\E /gcsx)
-		{
-			_failmsg qq{Did not find closing delimiter to match '$initial' at "} .
-				     substr($$textref, $oppos, 20) .
-				     q{..."},
-				 pos $$textref;
-			pos $$textref = $startpos;
-			return;
-		}
-		$modpos= pos($$textref);
-		$rd1pos = $modpos-1;
-
-		if ($initial eq '/' || $initial eq '?') 
-		{
-			$$textref =~ m/\G$mods{none}/gc
-		}
-
-		my $endpos = pos($$textref);
-		return (
-			$startpos,	$oppos-$startpos,	# PREFIX
-			$oppos,		0,			# NO OPERATOR
-			$oppos,		1,			# LEFT DEL
-			$oppos+1,	$rd1pos-$oppos-1,	# STR/PAT
-			$rd1pos,	1,			# RIGHT DEL
-			$modpos,	0,			# NO 2ND LDEL
-			$modpos,	0,			# NO 2ND STR
-			$modpos,	0,			# NO 2ND RDEL
-			$modpos,	$endpos-$modpos,	# MODIFIERS
-			$endpos, 	$textlen-$endpos,	# REMAINDER
-		       );
-	}
-
-	unless ($$textref =~ m{\G(\b(?:m|s|qq|qx|qw|q|qr|tr|y)\b(?=\s*\S)|<<)}gc)
-	{
-		_failmsg q{No quotelike operator found after prefix at "} .
-			     substr($$textref, pos($$textref), 20) .
-			     q{..."},
-		         pos $$textref;
-		pos $$textref = $startpos;
-		return;
-	}
-
-	my $op = $1;
-	$preld1pos = pos($$textref);
-	if ($op eq '<<') {
-		$ld1pos = pos($$textref);
-		my $label;
-		if ($$textref =~ m{\G([A-Za-z_]\w*)}gc) {
-			$label = $1;
-		}
-		elsif ($$textref =~ m{ \G ' ([^'\\]* (?:\\.[^'\\]*)*) '
-				     | \G " ([^"\\]* (?:\\.[^"\\]*)*) "
-				     | \G ` ([^`\\]* (?:\\.[^`\\]*)*) `
-				     }gcsx) {
-			$label = $+;
-		}
-		else {
-			$label = "";
-		}
-		my $extrapos = pos($$textref);
-		$$textref =~ m{.*\n}gc;
-		$str1pos = pos($$textref)--;
-		unless ($$textref =~ m{.*?\n(?=\Q$label\E\n)}gc) {
-			_failmsg qq{Missing here doc terminator ('$label') after "} .
-				     substr($$textref, $startpos, 20) .
-				     q{..."},
-				 pos $$textref;
-			pos $$textref = $startpos;
-			return;
-		}
-		$rd1pos = pos($$textref);
-        $$textref =~ m{\Q$label\E\n}gc;
-		$ld2pos = pos($$textref);
-		return (
-			$startpos,	$oppos-$startpos,	# PREFIX
-			$oppos,		length($op),		# OPERATOR
-			$ld1pos,	$extrapos-$ld1pos,	# LEFT DEL
-			$str1pos,	$rd1pos-$str1pos,	# STR/PAT
-			$rd1pos,	$ld2pos-$rd1pos,	# RIGHT DEL
-			$ld2pos,	0,			# NO 2ND LDEL
-			$ld2pos,	0,                	# NO 2ND STR
-			$ld2pos,	0,	                # NO 2ND RDEL
-			$ld2pos,	0,                      # NO MODIFIERS
-			$ld2pos,	$textlen-$ld2pos,	# REMAINDER
-			$extrapos,      $str1pos-$extrapos,	# FILLETED BIT
-		       );
-	}
-
-	$$textref =~ m/\G\s*/gc;
-	$ld1pos = pos($$textref);
-	$str1pos = $ld1pos+1;
-
-	unless ($$textref =~ m/\G(\S)/gc)	# SHOULD USE LOOKAHEAD
-	{
-		_failmsg "No block delimiter found after quotelike $op",
-		         pos $$textref;
-		pos $$textref = $startpos;
-		return;
-	}
-	pos($$textref) = $ld1pos;	# HAVE TO DO THIS BECAUSE LOOKAHEAD BROKEN
-	my ($ldel1, $rdel1) = ("\Q$1","\Q$1");
-	if ($ldel1 =~ /[[(<{]/)
-	{
-		$rdel1 =~ tr/[({</])}>/;
-		defined(_match_bracketed($textref,"",$ldel1,"","",$rdel1))
-		|| do { pos $$textref = $startpos; return };
-        $ld2pos = pos($$textref);
-        $rd1pos = $ld2pos-1;
-	}
-	else
-	{
-		$$textref =~ /\G$ldel1[^\\$ldel1]*(\\.[^\\$ldel1]*)*$ldel1/gcs
-		|| do { pos $$textref = $startpos; return };
-        $ld2pos = $rd1pos = pos($$textref)-1;
-	}
-
-	my $second_arg = $op =~ /s|tr|y/ ? 1 : 0;
-	if ($second_arg)
-	{
-		my ($ldel2, $rdel2);
-		if ($ldel1 =~ /[[(<{]/)
-		{
-			unless ($$textref =~ /\G\s*(\S)/gc)	# SHOULD USE LOOKAHEAD
-			{
-				_failmsg "Missing second block for quotelike $op",
-					 pos $$textref;
-				pos $$textref = $startpos;
-				return;
-			}
-			$ldel2 = $rdel2 = "\Q$1";
-			$rdel2 =~ tr/[({</])}>/;
-		}
-		else
-		{
-			$ldel2 = $rdel2 = $ldel1;
-		}
-		$str2pos = $ld2pos+1;
-
-		if ($ldel2 =~ /[[(<{]/)
-		{
-			pos($$textref)--;	# OVERCOME BROKEN LOOKAHEAD 
-			defined(_match_bracketed($textref,"",$ldel2,"","",$rdel2))
-			|| do { pos $$textref = $startpos; return };
-		}
-		else
-		{
-			$$textref =~ /[^\\$ldel2]*(\\.[^\\$ldel2]*)*$ldel2/gcs
-			|| do { pos $$textref = $startpos; return };
-		}
-		$rd2pos = pos($$textref)-1;
-	}
-	else
-	{
-		$ld2pos = $str2pos = $rd2pos = $rd1pos;
-	}
-
-	$modpos = pos $$textref;
-
-	$$textref =~ m/\G($mods{$op})/gc;
-	my $endpos = pos $$textref;
-
-	return (
-		$startpos,	$oppos-$startpos,	# PREFIX
-		$oppos,		length($op),		# OPERATOR
-		$ld1pos,	1,			# LEFT DEL
-		$str1pos,	$rd1pos-$str1pos,	# STR/PAT
-		$rd1pos,	1,			# RIGHT DEL
-		$ld2pos,	$second_arg,		# 2ND LDEL (MAYBE)
-		$str2pos,	$rd2pos-$str2pos,	# 2ND STR (MAYBE)
-		$rd2pos,	$second_arg,		# 2ND RDEL (MAYBE)
-		$modpos,	$endpos-$modpos,	# MODIFIERS
-		$endpos,	$textlen-$endpos,	# REMAINDER
-	       );
-}
-
-my $def_func = [
-	sub { extract_variable($_[0], '') },
-	sub { extract_quotelike($_[0],'') },
-	sub { extract_codeblock($_[0],'{}','') },
-];
-
-sub extract_multiple (;$$$$)	# ($text, $functions_ref, $max_fields, $ignoreunknown)
-{
-	my $textref = defined($_[0]) ? \$_[0] : \$_;
-	my $posbug = pos;
-	my ($lastpos, $firstpos);
-	my @fields = ();
-
-	#for ($$textref)
-	{
-		my @func = defined $_[1] ? @{$_[1]} : @{$def_func};
-		my $max  = defined $_[2] && $_[2]>0 ? $_[2] : 1_000_000_000;
-		my $igunk = $_[3];
-
-		pos $$textref ||= 0;
-
-		unless (wantarray)
-		{
-			use Carp;
-			carp "extract_multiple reset maximal count to 1 in scalar context"
-				if $^W && defined($_[2]) && $max > 1;
-			$max = 1
-		}
-
-		my $unkpos;
-		my $func;
-		my $class;
-
-		my @class;
-		foreach $func ( @func )
-		{
-			if (ref($func) eq 'HASH')
-			{
-				push @class, (keys %$func)[0];
-				$func = (values %$func)[0];
-			}
-			else
-			{
-				push @class, undef;
-			}
-		}
-
-		FIELD: while (pos($$textref) < length($$textref))
-		{
-			my ($field, $rem);
-			my @bits;
-			foreach my $i ( 0..$#func )
-			{
-				my $pref;
-				$func = $func[$i];
-				$class = $class[$i];
-				$lastpos = pos $$textref;
-				if (ref($func) eq 'CODE')
-					{ ($field,$rem,$pref) = @bits = $func->($$textref) }
-				elsif (ref($func) eq 'Text::Balanced::Extractor')
-					{ @bits = $field = $func->extract($$textref) }
-				elsif( $$textref =~ m/\G$func/gc )
-					{ @bits = $field = defined($1)
-                                ? $1
-                                : substr($$textref, $-[0], $+[0] - $-[0])
-                    }
-				$pref ||= "";
-				if (defined($field) && length($field))
-				{
-					if (!$igunk) {
-						$unkpos = $lastpos
-							if length($pref) && !defined($unkpos);
-						if (defined $unkpos)
-						{
-							push @fields, substr($$textref, $unkpos, $lastpos-$unkpos).$pref;
-							$firstpos = $unkpos unless defined $firstpos;
-							undef $unkpos;
-							last FIELD if @fields == $max;
-						}
-					}
-					push @fields, $class
-						? bless (\$field, $class)
-						: $field;
-					$firstpos = $lastpos unless defined $firstpos;
-					$lastpos = pos $$textref;
-					last FIELD if @fields == $max;
-					next FIELD;
-				}
-			}
-			if ($$textref =~ /\G(.)/gcs)
-			{
-				$unkpos = pos($$textref)-1
-					unless $igunk || defined $unkpos;
-			}
-		}
-		
-		if (defined $unkpos)
-		{
-			push @fields, substr($$textref, $unkpos);
-			$firstpos = $unkpos unless defined $firstpos;
-			$lastpos = length $$textref;
-		}
-		last;
-	}
-
-	pos $$textref = $lastpos;
-	return @fields if wantarray;
-
-	$firstpos ||= 0;
-	eval { substr($$textref,$firstpos,$lastpos-$firstpos)="";
-	       pos $$textref = $firstpos };
-	return $fields[0];
-}
-
-sub gen_extract_tagged # ($opentag, $closetag, $pre, \%options)
-{
-	my $ldel    = $_[0];
-	my $rdel    = $_[1];
-	my $pre     = defined $_[2] ? $_[2] : '\s*';
-	my %options = defined $_[3] ? %{$_[3]} : ();
-	my $omode   = defined $options{fail} ? $options{fail} : '';
-	my $bad     = ref($options{reject}) eq 'ARRAY' ? join('|', @{$options{reject}})
-		    : defined($options{reject})	       ? $options{reject}
-		    :					 ''
-		    ;
-	my $ignore  = ref($options{ignore}) eq 'ARRAY' ? join('|', @{$options{ignore}})
-		    : defined($options{ignore})	       ? $options{ignore}
-		    :					 ''
-		    ;
-
-	if (!defined $ldel) { $ldel = '<\w+(?:' . gen_delimited_pat(q{'"}) . '|[^>])*>'; }
-
-	my $posbug = pos;
-	for ($ldel, $pre, $bad, $ignore) { $_ = qr/$_/ if $_ }
-	pos = $posbug;
-
-	my $closure = sub
-	{
-		my $textref = defined $_[0] ? \$_[0] : \$_;
-		my @match = Text::Balanced::_match_tagged($textref, $pre, $ldel, $rdel, $omode, $bad, $ignore);
-
-		return _fail(wantarray, $textref) unless @match;
-		return _succeed wantarray, $textref,
-				$match[2], $match[3]+$match[5]+$match[7],	# MATCH
-				@match[8..9,0..1,2..7];				# REM, PRE, BITS
-	};
-
-	bless $closure, 'Text::Balanced::Extractor';
-}
-
-package Text::Balanced::Extractor;
-
-sub extract($$)	# ($self, $text)
-{
-	&{$_[0]}($_[1]);
-}
-
-package Text::Balanced::ErrorMsg;
-
-use overload '""' => sub { "$_[0]->{error}, detected at offset $_[0]->{pos}" };
-
-1;
-
-__END__
-
-=pod
-
-=head1 NAME
-
-Text::Balanced - Extract delimited text sequences from strings.
-
-=head1 SYNOPSIS
-
- use Text::Balanced qw (
-			extract_delimited
-			extract_bracketed
-			extract_quotelike
-			extract_codeblock
-			extract_variable
-			extract_tagged
-			extract_multiple
-			gen_delimited_pat
-			gen_extract_tagged
-		       );
-
- # Extract the initial substring of $text that is delimited by
- # two (unescaped) instances of the first character in $delim.
-
-	($extracted, $remainder) = extract_delimited($text,$delim);
-
-
- # Extract the initial substring of $text that is bracketed
- # with a delimiter(s) specified by $delim (where the string
- # in $delim contains one or more of '(){}[]<>').
-
-	($extracted, $remainder) = extract_bracketed($text,$delim);
-
-
- # Extract the initial substring of $text that is bounded by
- # an XML tag.
-
-	($extracted, $remainder) = extract_tagged($text);
-
-
- # Extract the initial substring of $text that is bounded by
- # a C<BEGIN>...C<END> pair. Don't allow nested C<BEGIN> tags
-
-	($extracted, $remainder) =
-		extract_tagged($text,"BEGIN","END",undef,{bad=>["BEGIN"]});
-
-
- # Extract the initial substring of $text that represents a
- # Perl "quote or quote-like operation"
-
-	($extracted, $remainder) = extract_quotelike($text);
-
-
- # Extract the initial substring of $text that represents a block
- # of Perl code, bracketed by any of character(s) specified by $delim
- # (where the string $delim contains one or more of '(){}[]<>').
-
-	($extracted, $remainder) = extract_codeblock($text,$delim);
-
-
- # Extract the initial substrings of $text that would be extracted by
- # one or more sequential applications of the specified functions
- # or regular expressions
-
-	@extracted = extract_multiple($text,
-				      [ \&extract_bracketed,
-					\&extract_quotelike,
-					\&some_other_extractor_sub,
-					qr/[xyz]*/,
-					'literal',
-				      ]);
-
-# Create a string representing an optimized pattern (a la Friedl)
-# that matches a substring delimited by any of the specified characters
-# (in this case: any type of quote or a slash)
-
-	$patstring = gen_delimited_pat(q{'"`/});
-
-# Generate a reference to an anonymous sub that is just like extract_tagged
-# but pre-compiled and optimized for a specific pair of tags, and consequently
-# much faster (i.e. 3 times faster). It uses qr// for better performance on
-# repeated calls, so it only works under Perl 5.005 or later.
-
-	$extract_head = gen_extract_tagged('<HEAD>','</HEAD>');
-
-	($extracted, $remainder) = $extract_head->($text);
-
-=head1 DESCRIPTION
-
-The various C<extract_...> subroutines may be used to
-extract a delimited substring, possibly after skipping a
-specified prefix string. By default, that prefix is
-optional whitespace (C</\s*/>), but you can change it to whatever
-you wish (see below).
-
-The substring to be extracted must appear at the
-current C<pos> location of the string's variable
-(or at index zero, if no C<pos> position is defined).
-In other words, the C<extract_...> subroutines I<don't>
-extract the first occurrence of a substring anywhere
-in a string (like an unanchored regex would). Rather,
-they extract an occurrence of the substring appearing
-immediately at the current matching position in the
-string (like a C<\G>-anchored regex would).
-
-=head2 General behaviour in list contexts
-
-In a list context, all the subroutines return a list, the first three
-elements of which are always:
-
-=over 4
-
-=item [0]
-
-The extracted string, including the specified delimiters.
-If the extraction fails C<undef> is returned.
-
-=item [1]
-
-The remainder of the input string (i.e. the characters after the
-extracted string). On failure, the entire string is returned.
-
-=item [2]
-
-The skipped prefix (i.e. the characters before the extracted string).
-On failure, C<undef> is returned.
-
-=back 
-
-Note that in a list context, the contents of the original input text (the first
-argument) are not modified in any way. 
-
-However, if the input text was passed in a variable, that variable's
-C<pos> value is updated to point at the first character after the
-extracted text. That means that in a list context the various
-subroutines can be used much like regular expressions. For example:
-
-	while ( $next = (extract_quotelike($text))[0] )
-	{
-		# process next quote-like (in $next)
-	}
-
-=head2 General behaviour in scalar and void contexts
-
-In a scalar context, the extracted string is returned, having first been
-removed from the input text. Thus, the following code also processes
-each quote-like operation, but actually removes them from $text:
-
-	while ( $next = extract_quotelike($text) )
-	{
-		# process next quote-like (in $next)
-	}
-
-Note that if the input text is a read-only string (i.e. a literal),
-no attempt is made to remove the extracted text.
-
-In a void context the behaviour of the extraction subroutines is
-exactly the same as in a scalar context, except (of course) that the
-extracted substring is not returned.
-
-=head2 A note about prefixes
-
-Prefix patterns are matched without any trailing modifiers (C</gimsox> etc.)
-This can bite you if you're expecting a prefix specification like
-'.*?(?=<H1>)' to skip everything up to the first <H1> tag. Such a prefix
-pattern will only succeed if the <H1> tag is on the current line, since
-. normally doesn't match newlines.
-
-To overcome this limitation, you need to turn on /s matching within
-the prefix pattern, using the C<(?s)> directive: '(?s).*?(?=<H1>)'
-
-=head2 C<extract_delimited>
-
-The C<extract_delimited> function formalizes the common idiom
-of extracting a single-character-delimited substring from the start of
-a string. For example, to extract a single-quote delimited string, the
-following code is typically used:
-
-	($remainder = $text) =~ s/\A('(\\.|[^'])*')//s;
-	$extracted = $1;
-
-but with C<extract_delimited> it can be simplified to:
-
-	($extracted,$remainder) = extract_delimited($text, "'");
-
-C<extract_delimited> takes up to four scalars (the input text, the
-delimiters, a prefix pattern to be skipped, and any escape characters)
-and extracts the initial substring of the text that
-is appropriately delimited. If the delimiter string has multiple
-characters, the first one encountered in the text is taken to delimit
-the substring.
-The third argument specifies a prefix pattern that is to be skipped
-(but must be present!) before the substring is extracted.
-The final argument specifies the escape character to be used for each
-delimiter.
-
-All arguments are optional. If the escape characters are not specified,
-every delimiter is escaped with a backslash (C<\>).
-If the prefix is not specified, the
-pattern C<'\s*'> - optional whitespace - is used. If the delimiter set
-is also not specified, the set C</["'`]/> is used. If the text to be processed
-is not specified either, C<$_> is used.
-
-In list context, C<extract_delimited> returns a array of three
-elements, the extracted substring (I<including the surrounding
-delimiters>), the remainder of the text, and the skipped prefix (if
-any). If a suitable delimited substring is not found, the first
-element of the array is the empty string, the second is the complete
-original text, and the prefix returned in the third element is an
-empty string.
-
-In a scalar context, just the extracted substring is returned. In
-a void context, the extracted substring (and any prefix) are simply
-removed from the beginning of the first argument.
-
-Examples:
-
-	# Remove a single-quoted substring from the very beginning of $text:
-
-		$substring = extract_delimited($text, "'", '');
-
-	# Remove a single-quoted Pascalish substring (i.e. one in which
-	# doubling the quote character escapes it) from the very
-	# beginning of $text:
-
-		$substring = extract_delimited($text, "'", '', "'");
-
-	# Extract a single- or double- quoted substring from the
-	# beginning of $text, optionally after some whitespace
-	# (note the list context to protect $text from modification):
-
-		($substring) = extract_delimited $text, q{"'};
-
-	# Delete the substring delimited by the first '/' in $text:
-
-		$text = join '', (extract_delimited($text,'/','[^/]*')[2,1];
-
-Note that this last example is I<not> the same as deleting the first
-quote-like pattern. For instance, if C<$text> contained the string:
-
-	"if ('./cmd' =~ m/$UNIXCMD/s) { $cmd = $1; }"
-	
-then after the deletion it would contain:
-
-	"if ('.$UNIXCMD/s) { $cmd = $1; }"
-
-not:
-
-	"if ('./cmd' =~ ms) { $cmd = $1; }"
-	
-See L<"extract_quotelike"> for a (partial) solution to this problem.
-
-=head2 C<extract_bracketed>
-
-Like C<"extract_delimited">, the C<extract_bracketed> function takes
-up to three optional scalar arguments: a string to extract from, a delimiter
-specifier, and a prefix pattern. As before, a missing prefix defaults to
-optional whitespace and a missing text defaults to C<$_>. However, a missing
-delimiter specifier defaults to C<'{}()[]E<lt>E<gt>'> (see below).
-
-C<extract_bracketed> extracts a balanced-bracket-delimited
-substring (using any one (or more) of the user-specified delimiter
-brackets: '(..)', '{..}', '[..]', or '<..>'). Optionally it will also
-respect quoted unbalanced brackets (see below).
-
-A "delimiter bracket" is a bracket in list of delimiters passed as
-C<extract_bracketed>'s second argument. Delimiter brackets are
-specified by giving either the left or right (or both!) versions
-of the required bracket(s). Note that the order in which
-two or more delimiter brackets are specified is not significant.
-
-A "balanced-bracket-delimited substring" is a substring bounded by
-matched brackets, such that any other (left or right) delimiter
-bracket I<within> the substring is also matched by an opposite
-(right or left) delimiter bracket I<at the same level of nesting>. Any
-type of bracket not in the delimiter list is treated as an ordinary
-character.
-
-In other words, each type of bracket specified as a delimiter must be
-balanced and correctly nested within the substring, and any other kind of
-("non-delimiter") bracket in the substring is ignored.
-
-For example, given the string:
-
-	$text = "{ an '[irregularly :-(] {} parenthesized >:-)' string }";
-
-then a call to C<extract_bracketed> in a list context:
-
-	@result = extract_bracketed( $text, '{}' );
-
-would return:
-
-	( "{ an '[irregularly :-(] {} parenthesized >:-)' string }" , "" , "" )
-
-since both sets of C<'{..}'> brackets are properly nested and evenly balanced.
-(In a scalar context just the first element of the array would be returned. In
-a void context, C<$text> would be replaced by an empty string.)
-
-Likewise the call in:
-
-	@result = extract_bracketed( $text, '{[' );
-
-would return the same result, since all sets of both types of specified
-delimiter brackets are correctly nested and balanced.
-
-However, the call in:
-
-	@result = extract_bracketed( $text, '{([<' );
-
-would fail, returning:
-
-	( undef , "{ an '[irregularly :-(] {} parenthesized >:-)' string }"  );
-
-because the embedded pairs of C<'(..)'>s and C<'[..]'>s are "cross-nested" and
-the embedded C<'E<gt>'> is unbalanced. (In a scalar context, this call would
-return an empty string. In a void context, C<$text> would be unchanged.)
-
-Note that the embedded single-quotes in the string don't help in this
-case, since they have not been specified as acceptable delimiters and are
-therefore treated as non-delimiter characters (and ignored).
-
-However, if a particular species of quote character is included in the
-delimiter specification, then that type of quote will be correctly handled.
-for example, if C<$text> is:
-
-	$text = '<A HREF=">>>>">link</A>';
-
-then
-
-	@result = extract_bracketed( $text, '<">' );
-
-returns:
-
-	( '<A HREF=">>>>">', 'link</A>', "" )
-
-as expected. Without the specification of C<"> as an embedded quoter:
-
-	@result = extract_bracketed( $text, '<>' );
-
-the result would be:
-
-	( '<A HREF=">', '>>>">link</A>', "" )
-
-In addition to the quote delimiters C<'>, C<">, and C<`>, full Perl quote-like
-quoting (i.e. q{string}, qq{string}, etc) can be specified by including the
-letter 'q' as a delimiter. Hence:
-
-	@result = extract_bracketed( $text, '<q>' );
-
-would correctly match something like this:
-
-	$text = '<leftop: conj /and/ conj>';
-
-See also: C<"extract_quotelike"> and C<"extract_codeblock">.
-
-=head2 C<extract_variable>
-
-C<extract_variable> extracts any valid Perl variable or
-variable-involved expression, including scalars, arrays, hashes, array
-accesses, hash look-ups, method calls through objects, subroutine calls
-through subroutine references, etc.
-
-The subroutine takes up to two optional arguments:
-
-=over 4
-
-=item 1.
-
-A string to be processed (C<$_> if the string is omitted or C<undef>)
-
-=item 2.
-
-A string specifying a pattern to be matched as a prefix (which is to be
-skipped). If omitted, optional whitespace is skipped.
-
-=back
-
-On success in a list context, an array of 3 elements is returned. The
-elements are:
-
-=over 4
-
-=item [0]
-
-the extracted variable, or variablish expression
-
-=item [1]
-
-the remainder of the input text,
-
-=item [2]
-
-the prefix substring (if any),
-
-=back
-
-On failure, all of these values (except the remaining text) are C<undef>.
-
-In a scalar context, C<extract_variable> returns just the complete
-substring that matched a variablish expression. C<undef> is returned on
-failure. In addition, the original input text has the returned substring
-(and any prefix) removed from it.
-
-In a void context, the input text just has the matched substring (and
-any specified prefix) removed.
-
-
-=head2 C<extract_tagged>
-
-C<extract_tagged> extracts and segments text between (balanced)
-specified tags. 
-
-The subroutine takes up to five optional arguments:
-
-=over 4
-
-=item 1.
-
-A string to be processed (C<$_> if the string is omitted or C<undef>)
-
-=item 2.
-
-A string specifying a pattern to be matched as the opening tag.
-If the pattern string is omitted (or C<undef>) then a pattern
-that matches any standard XML tag is used.
-
-=item 3.
-
-A string specifying a pattern to be matched at the closing tag. 
-If the pattern string is omitted (or C<undef>) then the closing
-tag is constructed by inserting a C</> after any leading bracket
-characters in the actual opening tag that was matched (I<not> the pattern
-that matched the tag). For example, if the opening tag pattern
-is specified as C<'{{\w+}}'> and actually matched the opening tag 
-C<"{{DATA}}">, then the constructed closing tag would be C<"{{/DATA}}">.
-
-=item 4.
-
-A string specifying a pattern to be matched as a prefix (which is to be
-skipped). If omitted, optional whitespace is skipped.
-
-=item 5.
-
-A hash reference containing various parsing options (see below)
-
-=back
-
-The various options that can be specified are:
-
-=over 4
-
-=item C<reject =E<gt> $listref>
-
-The list reference contains one or more strings specifying patterns
-that must I<not> appear within the tagged text.
-
-For example, to extract
-an HTML link (which should not contain nested links) use:
-
-        extract_tagged($text, '<A>', '</A>', undef, {reject => ['<A>']} );
-
-=item C<ignore =E<gt> $listref>
-
-The list reference contains one or more strings specifying patterns
-that are I<not> be be treated as nested tags within the tagged text
-(even if they would match the start tag pattern).
-
-For example, to extract an arbitrary XML tag, but ignore "empty" elements:
-
-        extract_tagged($text, undef, undef, undef, {ignore => ['<[^>]*/>']} );
-
-(also see L<"gen_delimited_pat"> below).
-
-=item C<fail =E<gt> $str>
-
-The C<fail> option indicates the action to be taken if a matching end
-tag is not encountered (i.e. before the end of the string or some
-C<reject> pattern matches). By default, a failure to match a closing
-tag causes C<extract_tagged> to immediately fail.
-
-However, if the string value associated with <reject> is "MAX", then
-C<extract_tagged> returns the complete text up to the point of failure.
-If the string is "PARA", C<extract_tagged> returns only the first paragraph
-after the tag (up to the first line that is either empty or contains
-only whitespace characters).
-If the string is "", the the default behaviour (i.e. failure) is reinstated.
-
-For example, suppose the start tag "/para" introduces a paragraph, which then
-continues until the next "/endpara" tag or until another "/para" tag is
-encountered:
-
-        $text = "/para line 1\n\nline 3\n/para line 4";
-
-        extract_tagged($text, '/para', '/endpara', undef,
-                                {reject => '/para', fail => MAX );
-
-        # EXTRACTED: "/para line 1\n\nline 3\n"
-
-Suppose instead, that if no matching "/endpara" tag is found, the "/para"
-tag refers only to the immediately following paragraph:
-
-        $text = "/para line 1\n\nline 3\n/para line 4";
-
-        extract_tagged($text, '/para', '/endpara', undef,
-                        {reject => '/para', fail => MAX );
-
-        # EXTRACTED: "/para line 1\n"
-
-Note that the specified C<fail> behaviour applies to nested tags as well.
-
-=back
-
-On success in a list context, an array of 6 elements is returned. The elements are:
-
-=over 4
-
-=item [0]
-
-the extracted tagged substring (including the outermost tags),
-
-=item [1]
-
-the remainder of the input text,
-
-=item [2]
-
-the prefix substring (if any),
-
-=item [3]
-
-the opening tag
-
-=item [4]
-
-the text between the opening and closing tags
-
-=item [5]
-
-the closing tag (or "" if no closing tag was found)
-
-=back
-
-On failure, all of these values (except the remaining text) are C<undef>.
-
-In a scalar context, C<extract_tagged> returns just the complete
-substring that matched a tagged text (including the start and end
-tags). C<undef> is returned on failure. In addition, the original input
-text has the returned substring (and any prefix) removed from it.
-
-In a void context, the input text just has the matched substring (and
-any specified prefix) removed.
-
-=head2 C<gen_extract_tagged>
-
-(Note: This subroutine is only available under Perl5.005)
-
-C<gen_extract_tagged> generates a new anonymous subroutine which
-extracts text between (balanced) specified tags. In other words,
-it generates a function identical in function to C<extract_tagged>.
-
-The difference between C<extract_tagged> and the anonymous
-subroutines generated by
-C<gen_extract_tagged>, is that those generated subroutines:
-
-=over 4
-
-=item * 
-
-do not have to reparse tag specification or parsing options every time
-they are called (whereas C<extract_tagged> has to effectively rebuild
-its tag parser on every call);
-
-=item *
-
-make use of the new qr// construct to pre-compile the regexes they use
-(whereas C<extract_tagged> uses standard string variable interpolation 
-to create tag-matching patterns).
-
-=back
-
-The subroutine takes up to four optional arguments (the same set as
-C<extract_tagged> except for the string to be processed). It returns
-a reference to a subroutine which in turn takes a single argument (the text to
-be extracted from).
-
-In other words, the implementation of C<extract_tagged> is exactly
-equivalent to:
-
-        sub extract_tagged
-        {
-                my $text = shift;
-                $extractor = gen_extract_tagged(@_);
-                return $extractor->($text);
-        }
-
-(although C<extract_tagged> is not currently implemented that way, in order
-to preserve pre-5.005 compatibility).
-
-Using C<gen_extract_tagged> to create extraction functions for specific tags 
-is a good idea if those functions are going to be called more than once, since
-their performance is typically twice as good as the more general-purpose
-C<extract_tagged>.
-
-
-=head2 C<extract_quotelike>
-
-C<extract_quotelike> attempts to recognize, extract, and segment any
-one of the various Perl quotes and quotelike operators (see
-L<perlop(3)>) Nested backslashed delimiters, embedded balanced bracket
-delimiters (for the quotelike operators), and trailing modifiers are
-all caught. For example, in:
-
-        extract_quotelike 'q # an octothorpe: \# (not the end of the q!) #'
-        
-        extract_quotelike '  "You said, \"Use sed\"."  '
-
-        extract_quotelike ' s{([A-Z]{1,8}\.[A-Z]{3})} /\L$1\E/; '
-
-        extract_quotelike ' tr/\\\/\\\\/\\\//ds; '
-
-the full Perl quotelike operations are all extracted correctly.
-
-Note too that, when using the /x modifier on a regex, any comment
-containing the current pattern delimiter will cause the regex to be
-immediately terminated. In other words:
-
-        'm /
-                (?i)            # CASE INSENSITIVE
-                [a-z_]          # LEADING ALPHABETIC/UNDERSCORE
-                [a-z0-9]*       # FOLLOWED BY ANY NUMBER OF ALPHANUMERICS
-           /x'
-
-will be extracted as if it were:
-
-        'm /
-                (?i)            # CASE INSENSITIVE
-                [a-z_]          # LEADING ALPHABETIC/'
-
-This behaviour is identical to that of the actual compiler.
-
-C<extract_quotelike> takes two arguments: the text to be processed and
-a prefix to be matched at the very beginning of the text. If no prefix 
-is specified, optional whitespace is the default. If no text is given,
-C<$_> is used.
-
-In a list context, an array of 11 elements is returned. The elements are:
-
-=over 4
-
-=item [0]
-
-the extracted quotelike substring (including trailing modifiers),
-
-=item [1]
-
-the remainder of the input text,
-
-=item [2]
-
-the prefix substring (if any),
-
-=item [3]
-
-the name of the quotelike operator (if any),
-
-=item [4]
-
-the left delimiter of the first block of the operation,
-
-=item [5]
-
-the text of the first block of the operation
-(that is, the contents of
-a quote, the regex of a match or substitution or the target list of a
-translation),
-
-=item [6]
-
-the right delimiter of the first block of the operation,
-
-=item [7]
-
-the left delimiter of the second block of the operation
-(that is, if it is a C<s>, C<tr>, or C<y>),
-
-=item [8]
-
-the text of the second block of the operation 
-(that is, the replacement of a substitution or the translation list
-of a translation),
-
-=item [9]
-
-the right delimiter of the second block of the operation (if any),
-
-=item [10]
-
-the trailing modifiers on the operation (if any).
-
-=back
-
-For each of the fields marked "(if any)" the default value on success is
-an empty string.
-On failure, all of these values (except the remaining text) are C<undef>.
-
-In a scalar context, C<extract_quotelike> returns just the complete substring
-that matched a quotelike operation (or C<undef> on failure). In a scalar or
-void context, the input text has the same substring (and any specified
-prefix) removed.
-
-Examples:
-
-        # Remove the first quotelike literal that appears in text
-
-                $quotelike = extract_quotelike($text,'.*?');
-
-        # Replace one or more leading whitespace-separated quotelike
-        # literals in $_ with "<QLL>"
-
-                do { $_ = join '<QLL>', (extract_quotelike)[2,1] } until $@;
-
-
-        # Isolate the search pattern in a quotelike operation from $text
-
-                ($op,$pat) = (extract_quotelike $text)[3,5];
-                if ($op =~ /[ms]/)
-                {
-                        print "search pattern: $pat\n";
-                }
-                else
-                {
-                        print "$op is not a pattern matching operation\n";
-                }
-
-=head2 C<extract_quotelike> and "here documents"
-
-C<extract_quotelike> can successfully extract "here documents" from an input
-string, but with an important caveat in list contexts.
-
-Unlike other types of quote-like literals, a here document is rarely
-a contiguous substring. For example, a typical piece of code using
-here document might look like this:
-
-        <<'EOMSG' || die;
-        This is the message.
-        EOMSG
-        exit;
-
-Given this as an input string in a scalar context, C<extract_quotelike>
-would correctly return the string "<<'EOMSG'\nThis is the message.\nEOMSG",
-leaving the string " || die;\nexit;" in the original variable. In other words,
-the two separate pieces of the here document are successfully extracted and
-concatenated.
-
-In a list context, C<extract_quotelike> would return the list
-
-=over 4
-
-=item [0]
-
-"<<'EOMSG'\nThis is the message.\nEOMSG\n" (i.e. the full extracted here document,
-including fore and aft delimiters),
-
-=item [1]
-
-" || die;\nexit;" (i.e. the remainder of the input text, concatenated),
-
-=item [2]
-
-"" (i.e. the prefix substring -- trivial in this case),
-
-=item [3]
-
-"<<" (i.e. the "name" of the quotelike operator)
-
-=item [4]
-
-"'EOMSG'" (i.e. the left delimiter of the here document, including any quotes),
-
-=item [5]
-
-"This is the message.\n" (i.e. the text of the here document),
-
-=item [6]
-
-"EOMSG" (i.e. the right delimiter of the here document),
-
-=item [7..10]
-
-"" (a here document has no second left delimiter, second text, second right
-delimiter, or trailing modifiers).
-
-=back
-
-However, the matching position of the input variable would be set to
-"exit;" (i.e. I<after> the closing delimiter of the here document),
-which would cause the earlier " || die;\nexit;" to be skipped in any
-sequence of code fragment extractions.
-
-To avoid this problem, when it encounters a here document whilst
-extracting from a modifiable string, C<extract_quotelike> silently
-rearranges the string to an equivalent piece of Perl:
-
-        <<'EOMSG'
-        This is the message.
-        EOMSG
-        || die;
-        exit;
-
-in which the here document I<is> contiguous. It still leaves the
-matching position after the here document, but now the rest of the line
-on which the here document starts is not skipped.
-
-To prevent <extract_quotelike> from mucking about with the input in this way
-(this is the only case where a list-context C<extract_quotelike> does so),
-you can pass the input variable as an interpolated literal:
-
-        $quotelike = extract_quotelike("$var");
-
-=head2 C<extract_codeblock>
-
-C<extract_codeblock> attempts to recognize and extract a balanced
-bracket delimited substring that may contain unbalanced brackets
-inside Perl quotes or quotelike operations. That is, C<extract_codeblock>
-is like a combination of C<"extract_bracketed"> and
-C<"extract_quotelike">.
-
-C<extract_codeblock> takes the same initial three parameters as C<extract_bracketed>:
-a text to process, a set of delimiter brackets to look for, and a prefix to
-match first. It also takes an optional fourth parameter, which allows the
-outermost delimiter brackets to be specified separately (see below).
-
-Omitting the first argument (input text) means process C<$_> instead.
-Omitting the second argument (delimiter brackets) indicates that only C<'{'> is to be used.
-Omitting the third argument (prefix argument) implies optional whitespace at the start.
-Omitting the fourth argument (outermost delimiter brackets) indicates that the
-value of the second argument is to be used for the outermost delimiters.
-
-Once the prefix an dthe outermost opening delimiter bracket have been
-recognized, code blocks are extracted by stepping through the input text and
-trying the following alternatives in sequence:
-
-=over 4
-
-=item 1.
-
-Try and match a closing delimiter bracket. If the bracket was the same
-species as the last opening bracket, return the substring to that
-point. If the bracket was mismatched, return an error.
-
-=item 2.
-
-Try to match a quote or quotelike operator. If found, call
-C<extract_quotelike> to eat it. If C<extract_quotelike> fails, return
-the error it returned. Otherwise go back to step 1.
-
-=item 3.
-
-Try to match an opening delimiter bracket. If found, call
-C<extract_codeblock> recursively to eat the embedded block. If the
-recursive call fails, return an error. Otherwise, go back to step 1.
-
-=item 4.
-
-Unconditionally match a bareword or any other single character, and
-then go back to step 1.
-
-=back
-
-Examples:
-
-        # Find a while loop in the text
-
-                if ($text =~ s/.*?while\s*\{/{/)
-                {
-                        $loop = "while " . extract_codeblock($text);
-                }
-
-        # Remove the first round-bracketed list (which may include
-        # round- or curly-bracketed code blocks or quotelike operators)
-
-                extract_codeblock $text, "(){}", '[^(]*';
-
-
-The ability to specify a different outermost delimiter bracket is useful
-in some circumstances. For example, in the Parse::RecDescent module,
-parser actions which are to be performed only on a successful parse
-are specified using a C<E<lt>defer:...E<gt>> directive. For example:
-
-        sentence: subject verb object
-                        <defer: {$::theVerb = $item{verb}} >
-
-Parse::RecDescent uses C<extract_codeblock($text, '{}E<lt>E<gt>')> to extract the code
-within the C<E<lt>defer:...E<gt>> directive, but there's a problem.
-
-A deferred action like this:
-
-                        <defer: {if ($count>10) {$count--}} >
-
-will be incorrectly parsed as:
-
-                        <defer: {if ($count>
-
-because the "less than" operator is interpreted as a closing delimiter.
-
-But, by extracting the directive using
-S<C<extract_codeblock($text, '{}', undef, 'E<lt>E<gt>')>>
-the '>' character is only treated as a delimited at the outermost
-level of the code block, so the directive is parsed correctly.
-
-=head2 C<extract_multiple>
-
-The C<extract_multiple> subroutine takes a string to be processed and a 
-list of extractors (subroutines or regular expressions) to apply to that string.
-
-In an array context C<extract_multiple> returns an array of substrings
-of the original string, as extracted by the specified extractors.
-In a scalar context, C<extract_multiple> returns the first
-substring successfully extracted from the original string. In both
-scalar and void contexts the original string has the first successfully
-extracted substring removed from it. In all contexts
-C<extract_multiple> starts at the current C<pos> of the string, and
-sets that C<pos> appropriately after it matches.
-
-Hence, the aim of of a call to C<extract_multiple> in a list context
-is to split the processed string into as many non-overlapping fields as
-possible, by repeatedly applying each of the specified extractors
-to the remainder of the string. Thus C<extract_multiple> is
-a generalized form of Perl's C<split> subroutine.
-
-The subroutine takes up to four optional arguments:
-
-=over 4
-
-=item 1.
-
-A string to be processed (C<$_> if the string is omitted or C<undef>)
-
-=item 2.
-
-A reference to a list of subroutine references and/or qr// objects and/or
-literal strings and/or hash references, specifying the extractors
-to be used to split the string. If this argument is omitted (or
-C<undef>) the list:
-
-        [
-                sub { extract_variable($_[0], '') },
-                sub { extract_quotelike($_[0],'') },
-                sub { extract_codeblock($_[0],'{}','') },
-        ]
-
-is used.
-
-=item 3.
-
-An number specifying the maximum number of fields to return. If this
-argument is omitted (or C<undef>), split continues as long as possible.
-
-If the third argument is I<N>, then extraction continues until I<N> fields
-have been successfully extracted, or until the string has been completely 
-processed.
-
-Note that in scalar and void contexts the value of this argument is 
-automatically reset to 1 (under C<-w>, a warning is issued if the argument 
-has to be reset).
-
-=item 4.
-
-A value indicating whether unmatched substrings (see below) within the
-text should be skipped or returned as fields. If the value is true,
-such substrings are skipped. Otherwise, they are returned.
-
-=back
-
-The extraction process works by applying each extractor in
-sequence to the text string.
-
-If the extractor is a subroutine it is called in a list context and is
-expected to return a list of a single element, namely the extracted
-text. It may optionally also return two further arguments: a string
-representing the text left after extraction (like $' for a pattern
-match), and a string representing any prefix skipped before the
-extraction (like $` in a pattern match). Note that this is designed
-to facilitate the use of other Text::Balanced subroutines with
-C<extract_multiple>. Note too that the value returned by an extractor
-subroutine need not bear any relationship to the corresponding substring
-of the original text (see examples below).
-
-If the extractor is a precompiled regular expression or a string,
-it is matched against the text in a scalar context with a leading
-'\G' and the gc modifiers enabled. The extracted value is either
-$1 if that variable is defined after the match, or else the
-complete match (i.e. $&).
-
-If the extractor is a hash reference, it must contain exactly one element.
-The value of that element is one of the
-above extractor types (subroutine reference, regular expression, or string).
-The key of that element is the name of a class into which the successful
-return value of the extractor will be blessed.
-
-If an extractor returns a defined value, that value is immediately
-treated as the next extracted field and pushed onto the list of fields.
-If the extractor was specified in a hash reference, the field is also
-blessed into the appropriate class, 
-
-If the extractor fails to match (in the case of a regex extractor), or returns an empty list or an undefined value (in the case of a subroutine extractor), it is
-assumed to have failed to extract.
-If none of the extractor subroutines succeeds, then one
-character is extracted from the start of the text and the extraction
-subroutines reapplied. Characters which are thus removed are accumulated and
-eventually become the next field (unless the fourth argument is true, in which
-case they are discarded).
-
-For example, the following extracts substrings that are valid Perl variables:
-
-        @fields = extract_multiple($text,
-                                   [ sub { extract_variable($_[0]) } ],
-                                   undef, 1);
-
-This example separates a text into fields which are quote delimited,
-curly bracketed, and anything else. The delimited and bracketed
-parts are also blessed to identify them (the "anything else" is unblessed):
-
-        @fields = extract_multiple($text,
-                   [
-                        { Delim => sub { extract_delimited($_[0],q{'"}) } },
-                        { Brack => sub { extract_bracketed($_[0],'{}') } },
-                   ]);
-
-This call extracts the next single substring that is a valid Perl quotelike
-operator (and removes it from $text):
-
-        $quotelike = extract_multiple($text,
-                                      [
-                                        sub { extract_quotelike($_[0]) },
-                                      ], undef, 1);
-
-Finally, here is yet another way to do comma-separated value parsing:
-
-        @fields = extract_multiple($csv_text,
-                                  [
-                                        sub { extract_delimited($_[0],q{'"}) },
-                                        qr/([^,]+)(.*)/,
-                                  ],
-                                  undef,1);
-
-The list in the second argument means:
-I<"Try and extract a ' or " delimited string, otherwise extract anything up to a comma...">.
-The undef third argument means:
-I<"...as many times as possible...">,
-and the true value in the fourth argument means
-I<"...discarding anything else that appears (i.e. the commas)">.
-
-If you wanted the commas preserved as separate fields (i.e. like split
-does if your split pattern has capturing parentheses), you would
-just make the last parameter undefined (or remove it).
-
-=head2 C<gen_delimited_pat>
-
-The C<gen_delimited_pat> subroutine takes a single (string) argument and
-   > builds a Friedl-style optimized regex that matches a string delimited
-by any one of the characters in the single argument. For example:
-
-        gen_delimited_pat(q{'"})
-
-returns the regex:
-
-        (?:\"(?:\\\"|(?!\").)*\"|\'(?:\\\'|(?!\').)*\')
-
-Note that the specified delimiters are automatically quotemeta'd.
-
-A typical use of C<gen_delimited_pat> would be to build special purpose tags
-for C<extract_tagged>. For example, to properly ignore "empty" XML elements
-(which might contain quoted strings):
-
-        my $empty_tag = '<(' . gen_delimited_pat(q{'"}) . '|.)+/>';
-
-        extract_tagged($text, undef, undef, undef, {ignore => [$empty_tag]} );
-
-C<gen_delimited_pat> may also be called with an optional second argument,
-which specifies the "escape" character(s) to be used for each delimiter.
-For example to match a Pascal-style string (where ' is the delimiter
-and '' is a literal ' within the string):
-
-        gen_delimited_pat(q{'},q{'});
-
-Different escape characters can be specified for different delimiters.
-For example, to specify that '/' is the escape for single quotes
-and '%' is the escape for double quotes:
-
-        gen_delimited_pat(q{'"},q{/%});
-
-If more delimiters than escape chars are specified, the last escape char
-is used for the remaining delimiters.
-If no escape char is specified for a given specified delimiter, '\' is used.
-
-=head2 C<delimited_pat>
-
-Note that C<gen_delimited_pat> was previously called C<delimited_pat>.
-That name may still be used, but is now deprecated.
-        
-
-=head1 DIAGNOSTICS
-
-In a list context, all the functions return C<(undef,$original_text)>
-on failure. In a scalar context, failure is indicated by returning C<undef>
-(in this case the input text is not modified in any way).
-
-In addition, on failure in I<any> context, the C<$@> variable is set.
-Accessing C<$@-E<gt>{error}> returns one of the error diagnostics listed
-below.
-Accessing C<$@-E<gt>{pos}> returns the offset into the original string at
-which the error was detected (although not necessarily where it occurred!)
-Printing C<$@> directly produces the error message, with the offset appended.
-On success, the C<$@> variable is guaranteed to be C<undef>.
-
-The available diagnostics are:
-
-=over 4
-
-=item  C<Did not find a suitable bracket: "%s">
-
-The delimiter provided to C<extract_bracketed> was not one of
-C<'()[]E<lt>E<gt>{}'>.
-
-=item  C<Did not find prefix: /%s/>
-
-A non-optional prefix was specified but wasn't found at the start of the text.
-
-=item  C<Did not find opening bracket after prefix: "%s">
-
-C<extract_bracketed> or C<extract_codeblock> was expecting a
-particular kind of bracket at the start of the text, and didn't find it.
-
-=item  C<No quotelike operator found after prefix: "%s">
-
-C<extract_quotelike> didn't find one of the quotelike operators C<q>,
-C<qq>, C<qw>, C<qx>, C<s>, C<tr> or C<y> at the start of the substring
-it was extracting.
-
-=item  C<Unmatched closing bracket: "%c">
-
-C<extract_bracketed>, C<extract_quotelike> or C<extract_codeblock> encountered
-a closing bracket where none was expected.
-
-=item  C<Unmatched opening bracket(s): "%s">
-
-C<extract_bracketed>, C<extract_quotelike> or C<extract_codeblock> ran 
-out of characters in the text before closing one or more levels of nested
-brackets.
-
-=item C<Unmatched embedded quote (%s)>
-
-C<extract_bracketed> attempted to match an embedded quoted substring, but
-failed to find a closing quote to match it.
-
-=item C<Did not find closing delimiter to match '%s'>
-
-C<extract_quotelike> was unable to find a closing delimiter to match the
-one that opened the quote-like operation.
-
-=item  C<Mismatched closing bracket: expected "%c" but found "%s">
-
-C<extract_bracketed>, C<extract_quotelike> or C<extract_codeblock> found
-a valid bracket delimiter, but it was the wrong species. This usually
-indicates a nesting error, but may indicate incorrect quoting or escaping.
-
-=item  C<No block delimiter found after quotelike "%s">
-
-C<extract_quotelike> or C<extract_codeblock> found one of the
-quotelike operators C<q>, C<qq>, C<qw>, C<qx>, C<s>, C<tr> or C<y>
-without a suitable block after it.
-
-=item C<Did not find leading dereferencer>
-
-C<extract_variable> was expecting one of '$', '@', or '%' at the start of
-a variable, but didn't find any of them.
-
-=item C<Bad identifier after dereferencer>
-
-C<extract_variable> found a '$', '@', or '%' indicating a variable, but that
-character was not followed by a legal Perl identifier.
-
-=item C<Did not find expected opening bracket at %s>
-
-C<extract_codeblock> failed to find any of the outermost opening brackets
-that were specified.
-
-=item C<Improperly nested codeblock at %s>
-
-A nested code block was found that started with a delimiter that was specified
-as being only to be used as an outermost bracket.
-
-=item  C<Missing second block for quotelike "%s">
-
-C<extract_codeblock> or C<extract_quotelike> found one of the
-quotelike operators C<s>, C<tr> or C<y> followed by only one block.
-
-=item C<No match found for opening bracket>
-
-C<extract_codeblock> failed to find a closing bracket to match the outermost
-opening bracket.
-
-=item C<Did not find opening tag: /%s/>
-
-C<extract_tagged> did not find a suitable opening tag (after any specified
-prefix was removed).
-
-=item C<Unable to construct closing tag to match: /%s/>
-
-C<extract_tagged> matched the specified opening tag and tried to
-modify the matched text to produce a matching closing tag (because
-none was specified). It failed to generate the closing tag, almost
-certainly because the opening tag did not start with a
-bracket of some kind.
-
-=item C<Found invalid nested tag: %s>
-
-C<extract_tagged> found a nested tag that appeared in the "reject" list
-(and the failure mode was not "MAX" or "PARA").
-
-=item C<Found unbalanced nested tag: %s>
-
-C<extract_tagged> found a nested opening tag that was not matched by a
-corresponding nested closing tag (and the failure mode was not "MAX" or "PARA").
-
-=item C<Did not find closing tag>
-
-C<extract_tagged> reached the end of the text without finding a closing tag
-to match the original opening tag (and the failure mode was not
-"MAX" or "PARA").
-
-=back
-
-=head1 AUTHOR
-
-Damian Conway (damian@conway.org)
-
-=head1 BUGS AND IRRITATIONS
-
-There are undoubtedly serious bugs lurking somewhere in this code, if
-only because parts of it give the impression of understanding a great deal
-more about Perl than they really do. 
-
-Bug reports and other feedback are most welcome.
-
-=head1 COPYRIGHT
-
-Copyright 1997 - 2001 Damian Conway. All Rights Reserved.
-
-Some (minor) parts copyright 2009 Adam Kennedy.
-
-This module is free software. It may be used, redistributed
-and/or modified under the same terms as Perl itself.
-
-=cut