Revert "Move Text::ParseWords from lib to ext"

(ExtUtils::Liblist::Kid::_win32_ext() requires Text::ParseWords, so it can't
live in ext until we solve the general problem of toolchain modules in ext)

This reverts the structural changes of commit
d6052a374138e04d8688ae89baeabff82e80a71c, but retains the boilerplate removal of
4a503f371e8f1d4e174172c023c18046ee5b1a22, as TestInit.pm renders it obsolete.

1 files changed, 294 insertions, 0 deletions

diff --git a/lib/Text/ParseWords.pm b/lib/Text/ParseWords.pm
new file mode 100644
index 0000000000..f1b5937904
--- /dev/null
+++ b/lib/Text/ParseWords.pm
@@ -0,0 +1,294 @@
+package Text::ParseWords;
+
+use strict;
+require 5.006;
+our $VERSION = "3.27";
+
+
+use Exporter;
+our @ISA = qw(Exporter);
+our @EXPORT = qw(shellwords quotewords nested_quotewords parse_line);
+our @EXPORT_OK = qw(old_shellwords);
+our $PERL_SINGLE_QUOTE;
+
+
+sub shellwords {
+    my (@lines) = @_;
+    my @allwords;
+
+    foreach my $line (@lines) {
+	$line =~ s/^\s+//;
+	my @words = parse_line('\s+', 0, $line);
+	pop @words if (@words and !defined $words[-1]);
+	return() unless (@words || !length($line));
+	push(@allwords, @words);
+    }
+    return(@allwords);
+}
+
+
+
+sub quotewords {
+    my($delim, $keep, @lines) = @_;
+    my($line, @words, @allwords);
+
+    foreach $line (@lines) {
+	@words = parse_line($delim, $keep, $line);
+	return() unless (@words || !length($line));
+	push(@allwords, @words);
+    }
+    return(@allwords);
+}
+
+
+
+sub nested_quotewords {
+    my($delim, $keep, @lines) = @_;
+    my($i, @allwords);
+
+    for ($i = 0; $i < @lines; $i++) {
+	@{$allwords[$i]} = parse_line($delim, $keep, $lines[$i]);
+	return() unless (@{$allwords[$i]} || !length($lines[$i]));
+    }
+    return(@allwords);
+}
+
+
+
+sub parse_line {
+    my($delimiter, $keep, $line) = @_;
+    my($word, @pieces);
+
+    no warnings 'uninitialized';	# we will be testing undef strings
+
+    while (length($line)) {
+        # This pattern is optimised to be stack conservative on older perls.
+        # Do not refactor without being careful and testing it on very long strings.
+        # See Perl bug #42980 for an example of a stack busting input.
+        $line =~ s/^
+                    (?: 
+                        # double quoted string
+                        (")                             # $quote
+                        ((?>[^\\"]*(?:\\.[^\\"]*)*))"   # $quoted 
+		    |	# --OR--
+                        # singe quoted string
+                        (')                             # $quote
+                        ((?>[^\\']*(?:\\.[^\\']*)*))'   # $quoted
+                    |   # --OR--
+                        # unquoted string
+		        (                               # $unquoted 
+                            (?:\\.|[^\\"'])*?           
+                        )		
+                        # followed by
+		        (                               # $delim
+                            \Z(?!\n)                    # EOL
+                        |   # --OR--
+                            (?-x:$delimiter)            # delimiter
+                        |   # --OR--                    
+                            (?!^)(?=["'])               # a quote
+                        )  
+		    )//xs or return;		# extended layout                  
+        my ($quote, $quoted, $unquoted, $delim) = (($1 ? ($1,$2) : ($3,$4)), $5, $6);
+
+
+	return() unless( defined($quote) || length($unquoted) || length($delim));
+
+        if ($keep) {
+	    $quoted = "$quote$quoted$quote";
+	}
+        else {
+	    $unquoted =~ s/\\(.)/$1/sg;
+	    if (defined $quote) {
+		$quoted =~ s/\\(.)/$1/sg if ($quote eq '"');
+		$quoted =~ s/\\([\\'])/$1/g if ( $PERL_SINGLE_QUOTE && $quote eq "'");
+            }
+	}
+        $word .= substr($line, 0, 0);	# leave results tainted
+        $word .= defined $quote ? $quoted : $unquoted;
+ 
+        if (length($delim)) {
+            push(@pieces, $word);
+            push(@pieces, $delim) if ($keep eq 'delimiters');
+            undef $word;
+        }
+        if (!length($line)) {
+            push(@pieces, $word);
+	}
+    }
+    return(@pieces);
+}
+
+
+
+sub old_shellwords {
+
+    # Usage:
+    #	use ParseWords;
+    #	@words = old_shellwords($line);
+    #	or
+    #	@words = old_shellwords(@lines);
+    #	or
+    #	@words = old_shellwords();	# defaults to $_ (and clobbers it)
+
+    no warnings 'uninitialized';	# we will be testing undef strings
+    local *_ = \join('', @_) if @_;
+    my (@words, $snippet);
+
+    s/\A\s+//;
+    while ($_ ne '') {
+	my $field = substr($_, 0, 0);	# leave results tainted
+	for (;;) {
+	    if (s/\A"(([^"\\]|\\.)*)"//s) {
+		($snippet = $1) =~ s#\\(.)#$1#sg;
+	    }
+	    elsif (/\A"/) {
+		require Carp;
+		Carp::carp("Unmatched double quote: $_");
+		return();
+	    }
+	    elsif (s/\A'(([^'\\]|\\.)*)'//s) {
+		($snippet = $1) =~ s#\\(.)#$1#sg;
+	    }
+	    elsif (/\A'/) {
+		require Carp;
+		Carp::carp("Unmatched single quote: $_");
+		return();
+	    }
+	    elsif (s/\A\\(.?)//s) {
+		$snippet = $1;
+	    }
+	    elsif (s/\A([^\s\\'"]+)//) {
+		$snippet = $1;
+	    }
+	    else {
+		s/\A\s+//;
+		last;
+	    }
+	    $field .= $snippet;
+	}
+	push(@words, $field);
+    }
+    return @words;
+}
+
+1;
+
+__END__
+
+=head1 NAME
+
+Text::ParseWords - parse text into an array of tokens or array of arrays
+
+=head1 SYNOPSIS
+
+  use Text::ParseWords;
+  @lists = nested_quotewords($delim, $keep, @lines);
+  @words = quotewords($delim, $keep, @lines);
+  @words = shellwords(@lines);
+  @words = parse_line($delim, $keep, $line);
+  @words = old_shellwords(@lines); # DEPRECATED!
+
+=head1 DESCRIPTION
+
+The &nested_quotewords() and &quotewords() functions accept a delimiter 
+(which can be a regular expression)
+and a list of lines and then breaks those lines up into a list of
+words ignoring delimiters that appear inside quotes.  &quotewords()
+returns all of the tokens in a single long list, while &nested_quotewords()
+returns a list of token lists corresponding to the elements of @lines.
+&parse_line() does tokenizing on a single string.  The &*quotewords()
+functions simply call &parse_line(), so if you're only splitting
+one line you can call &parse_line() directly and save a function
+call.
+
+The $keep argument is a boolean flag.  If true, then the tokens are
+split on the specified delimiter, but all other characters (quotes,
+backslashes, etc.) are kept in the tokens.  If $keep is false then the
+&*quotewords() functions remove all quotes and backslashes that are
+not themselves backslash-escaped or inside of single quotes (i.e.,
+&quotewords() tries to interpret these characters just like the Bourne
+shell).  NB: these semantics are significantly different from the
+original version of this module shipped with Perl 5.000 through 5.004.
+As an additional feature, $keep may be the keyword "delimiters" which
+causes the functions to preserve the delimiters in each string as
+tokens in the token lists, in addition to preserving quote and
+backslash characters.
+
+&shellwords() is written as a special case of &quotewords(), and it
+does token parsing with whitespace as a delimiter-- similar to most
+Unix shells.
+
+=head1 EXAMPLES
+
+The sample program:
+
+  use Text::ParseWords;
+  @words = quotewords('\s+', 0, q{this   is "a test" of\ quotewords \"for you});
+  $i = 0;
+  foreach (@words) {
+      print "$i: <$_>\n";
+      $i++;
+  }
+
+produces:
+
+  0: <this>
+  1: <is>
+  2: <a test>
+  3: <of quotewords>
+  4: <"for>
+  5: <you>
+
+demonstrating:
+
+=over 4
+
+=item 0
+
+a simple word
+
+=item 1
+
+multiple spaces are skipped because of our $delim
+
+=item 2
+
+use of quotes to include a space in a word
+
+=item 3
+
+use of a backslash to include a space in a word
+
+=item 4
+
+use of a backslash to remove the special meaning of a double-quote
+
+=item 5
+
+another simple word (note the lack of effect of the
+backslashed double-quote)
+
+=back
+
+Replacing C<quotewords('\s+', 0, q{this   is...})>
+with C<shellwords(q{this   is...})>
+is a simpler way to accomplish the same thing.
+
+=head1 AUTHORS
+
+Maintainer: Alexandr Ciornii <alexchornyATgmail.com>.
+
+Previous maintainer: Hal Pomeranz <pomeranz@netcom.com>, 1994-1997 (Original
+author unknown).  Much of the code for &parse_line() (including the
+primary regexp) from Joerk Behrends <jbehrends@multimediaproduzenten.de>.
+
+Examples section another documentation provided by John Heidemann 
+<johnh@ISI.EDU>
+
+Bug reports, patches, and nagging provided by lots of folks-- thanks
+everybody!  Special thanks to Michael Schwern <schwern@envirolink.org>
+for assuring me that a &nested_quotewords() would be useful, and to 
+Jeff Friedl <jfriedl@yahoo-inc.com> for telling me not to worry about
+error-checking (sort of-- you had to be there).
+
+=cut