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Tabs.pm 0000644 00000010551 15137360473 0006006 0 ustar 00 package Text::Tabs; require Exporter; @ISA = (Exporter); @EXPORT = qw(expand unexpand $tabstop); use vars qw($VERSION $SUBVERSION $tabstop $debug); $VERSION = 2013.0523; $SUBVERSION = 'modern'; use strict; use 5.010_000; BEGIN { $tabstop = 8; $debug = 0; } my $CHUNK = qr/\X/; sub _xlen (_) { scalar(() = $_[0] =~ /$CHUNK/g) } sub _xpos (_) { _xlen( substr( $_[0], 0, pos($_[0]) ) ) } sub expand { my @l; my $pad; for ( @_ ) { my $s = ''; for (split(/^/m, $_, -1)) { my $offs = 0; s{\t}{ # this works on both 5.10 and 5.11 $pad = $tabstop - (_xlen(${^PREMATCH}) + $offs) % $tabstop; # this works on 5.11, but fails on 5.10 #XXX# $pad = $tabstop - (_xpos() + $offs) % $tabstop; $offs += $pad - 1; " " x $pad; }peg; $s .= $_; } push(@l, $s); } return @l if wantarray; return $l[0]; } sub unexpand { my (@l) = @_; my @e; my $x; my $line; my @lines; my $lastbit; my $ts_as_space = " " x $tabstop; for $x (@l) { @lines = split("\n", $x, -1); for $line (@lines) { $line = expand($line); @e = split(/(${CHUNK}{$tabstop})/,$line,-1); $lastbit = pop(@e); $lastbit = '' unless defined $lastbit; $lastbit = "\t" if $lastbit eq $ts_as_space; for $_ (@e) { if ($debug) { my $x = $_; $x =~ s/\t/^I\t/gs; print "sub on '$x'\n"; } s/ +$/\t/; } $line = join('',@e, $lastbit); } $x = join("\n", @lines); } return @l if wantarray; return $l[0]; } 1; __END__ sub expand { my (@l) = @_; for $_ (@l) { 1 while s/(^|\n)([^\t\n]*)(\t+)/ $1. $2 . (" " x ($tabstop * length($3) - (length($2) % $tabstop))) /sex; } return @l if wantarray; return $l[0]; } =head1 NAME Text::Tabs - expand and unexpand tabs like unix expand(1) and unexpand(1) =head1 SYNOPSIS use Text::Tabs; $tabstop = 4; # default = 8 @lines_without_tabs = expand(@lines_with_tabs); @lines_with_tabs = unexpand(@lines_without_tabs); =head1 DESCRIPTION Text::Tabs does most of what the unix utilities expand(1) and unexpand(1) do. Given a line with tabs in it, C<expand> replaces those tabs with the appropriate number of spaces. Given a line with or without tabs in it, C<unexpand> adds tabs when it can save bytes by doing so, like the C<unexpand -a> command. Unlike the old unix utilities, this module correctly accounts for any Unicode combining characters (such as diacriticals) that may occur in each line for both expansion and unexpansion. These are overstrike characters that do not increment the logical position. Make sure you have the appropriate Unicode settings enabled. =head1 EXPORTS The following are exported: =over 4 =item expand =item unexpand =item $tabstop The C<$tabstop> variable controls how many column positions apart each tabstop is. The default is 8. Please note that C<local($tabstop)> doesn't do the right thing and if you want to use C<local> to override C<$tabstop>, you need to use C<local($Text::Tabs::tabstop)>. =back =head1 EXAMPLE #!perl # unexpand -a use Text::Tabs; while (<>) { print unexpand $_; } Instead of the shell's C<expand> command, use: perl -MText::Tabs -n -e 'print expand $_' Instead of the shell's C<unexpand -a> command, use: perl -MText::Tabs -n -e 'print unexpand $_' =head1 SUBVERSION This module comes in two flavors: one for modern perls (5.10 and above) and one for ancient obsolete perls. The version for modern perls has support for Unicode. The version for old perls does not. You can tell which version you have installed by looking at C<$Text::Tabs::SUBVERSION>: it is C<old> for obsolete perls and C<modern> for current perls. This man page is for the version for modern perls and so that's probably what you've got. =head1 BUGS Text::Tabs handles only tabs (C<"\t">) and combining characters (C</\pM/>). It doesn't count backwards for backspaces (C<"\t">), omit other non-printing control characters (C</\pC/>), or otherwise deal with any other zero-, half-, and full-width characters. =head1 LICENSE Copyright (C) 1996-2002,2005,2006 David Muir Sharnoff. Copyright (C) 2005 Aristotle Pagaltzis Copyright (C) 2012-2013 Google, Inc. This module may be modified, used, copied, and redistributed at your own risk. Although allowed by the preceding license, please do not publicly redistribute modified versions of this code with the name "Text::Tabs" unless it passes the unmodified Text::Tabs test suite. ParseWords.pm 0000644 00000017720 15137360473 0007213 0 ustar 00 package Text::ParseWords; use strict; require 5.006; our $VERSION = "3.30"; 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 "ewords() 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. "ewords() 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 (including quotes and backslashes) 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., "ewords() 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 "ewords(), 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 0Z<> a simple word =item 1Z<> multiple spaces are skipped because of our $delim =item 2Z<> use of quotes to include a space in a word =item 3Z<> use of a backslash to include a space in a word =item 4Z<> use of a backslash to remove the special meaning of a double-quote =item 5Z<> another simple word (note the lack of effect of the backslashed double-quote) =back Replacing C<quotewords('\s+', 0, q{this is...})> with C<shellwords(q{this is...})> is a simpler way to accomplish the same thing. =head1 SEE ALSO L<Text::CSV> - for parsing CSV files =head1 AUTHORS Maintainer: Alexandr Ciornii <alexchornyATgmail.com>. Previous maintainer: Hal Pomeranz <pomeranz@netcom.com>, 1994-1997 (Original author unknown). Much of the code for &parse_line() (including the primary regexp) from Joerk Behrends <jbehrends@multimediaproduzenten.de>. Examples section another documentation provided by John Heidemann <johnh@ISI.EDU> Bug reports, patches, and nagging provided by lots of folks-- thanks everybody! Special thanks to Michael Schwern <schwern@envirolink.org> for assuring me that a &nested_quotewords() would be useful, and to Jeff Friedl <jfriedl@yahoo-inc.com> for telling me not to worry about error-checking (sort of-- you had to be there). =head1 COPYRIGHT AND LICENSE This library is free software; you may redistribute and/or modify it under the same terms as Perl itself. =cut Wrap.pm 0000644 00000021472 15137360473 0006032 0 ustar 00 package Text::Wrap; use warnings::register; require Exporter; @ISA = qw(Exporter); @EXPORT = qw(wrap fill); @EXPORT_OK = qw($columns $break $huge); $VERSION = 2013.0523; $SUBVERSION = 'modern'; use 5.010_000; use vars qw($VERSION $SUBVERSION $columns $debug $break $huge $unexpand $tabstop $separator $separator2); use strict; BEGIN { $columns = 76; # <= screen width $debug = 0; $break = '(?=\s)\X'; $huge = 'wrap'; # alternatively: 'die' or 'overflow' $unexpand = 1; $tabstop = 8; $separator = "\n"; $separator2 = undef; } my $CHUNK = qr/\X/; sub _xlen(_) { scalar(() = $_[0] =~ /$CHUNK/g) } sub _xpos(_) { _xlen( substr( $_[0], 0, pos($_[0]) ) ) } use Text::Tabs qw(expand unexpand); sub wrap { my ($ip, $xp, @t) = @_; local($Text::Tabs::tabstop) = $tabstop; my $r = ""; my $tail = pop(@t); my $t = expand(join("", (map { /\s+\z/ ? ( $_ ) : ($_, ' ') } @t), $tail)); my $lead = $ip; my $nll = $columns - _xlen(expand($xp)) - 1; if ($nll <= 0 && $xp ne '') { my $nc = _xlen(expand($xp)) + 2; warnings::warnif "Increasing \$Text::Wrap::columns from $columns to $nc to accommodate length of subsequent tab"; $columns = $nc; $nll = 1; } my $ll = $columns - _xlen(expand($ip)) - 1; $ll = 0 if $ll < 0; my $nl = ""; my $remainder = ""; use re 'taint'; pos($t) = 0; while ($t !~ /\G(?:$break)*\Z/gc) { if ($t =~ /\G((?:(?=[^\n])\X){0,$ll})($break|\n+|\z)/xmgc) { $r .= $unexpand ? unexpand($nl . $lead . $1) : $nl . $lead . $1; $remainder = $2; } elsif ($huge eq 'wrap' && $t =~ /\G((?:(?=[^\n])\X){$ll})/gc) { $r .= $unexpand ? unexpand($nl . $lead . $1) : $nl . $lead . $1; $remainder = defined($separator2) ? $separator2 : $separator; } elsif ($huge eq 'overflow' && $t =~ /\G((?:(?=[^\n])\X)*?)($break|\n+|\z)/xmgc) { $r .= $unexpand ? unexpand($nl . $lead . $1) : $nl . $lead . $1; $remainder = $2; } elsif ($huge eq 'die') { die "couldn't wrap '$t'"; } elsif ($columns < 2) { warnings::warnif "Increasing \$Text::Wrap::columns from $columns to 2"; $columns = 2; return ($ip, $xp, @t); } else { die "This shouldn't happen"; } $lead = $xp; $ll = $nll; $nl = defined($separator2) ? ($remainder eq "\n" ? "\n" : $separator2) : $separator; } $r .= $remainder; print "-----------$r---------\n" if $debug; print "Finish up with '$lead'\n" if $debug; my($opos) = pos($t); $r .= $lead . substr($t, pos($t), length($t) - pos($t)) if pos($t) ne length($t); print "-----------$r---------\n" if $debug;; return $r; } sub fill { my ($ip, $xp, @raw) = @_; my @para; my $pp; for $pp (split(/\n\s+/, join("\n",@raw))) { $pp =~ s/\s+/ /g; my $x = wrap($ip, $xp, $pp); push(@para, $x); } # if paragraph_indent is the same as line_indent, # separate paragraphs with blank lines my $ps = ($ip eq $xp) ? "\n\n" : "\n"; return join ($ps, @para); } 1; __END__ =head1 NAME Text::Wrap - line wrapping to form simple paragraphs =head1 SYNOPSIS B<Example 1> use Text::Wrap; $initial_tab = "\t"; # Tab before first line $subsequent_tab = ""; # All other lines flush left print wrap($initial_tab, $subsequent_tab, @text); print fill($initial_tab, $subsequent_tab, @text); $lines = wrap($initial_tab, $subsequent_tab, @text); @paragraphs = fill($initial_tab, $subsequent_tab, @text); B<Example 2> use Text::Wrap qw(wrap $columns $huge); $columns = 132; # Wrap at 132 characters $huge = 'die'; $huge = 'wrap'; $huge = 'overflow'; B<Example 3> use Text::Wrap; $Text::Wrap::columns = 72; print wrap('', '', @text); =head1 DESCRIPTION C<Text::Wrap::wrap()> is a very simple paragraph formatter. It formats a single paragraph at a time by breaking lines at word boundaries. Indentation is controlled for the first line (C<$initial_tab>) and all subsequent lines (C<$subsequent_tab>) independently. Please note: C<$initial_tab> and C<$subsequent_tab> are the literal strings that will be used: it is unlikely you would want to pass in a number. C<Text::Wrap::fill()> is a simple multi-paragraph formatter. It formats each paragraph separately and then joins them together when it's done. It will destroy any whitespace in the original text. It breaks text into paragraphs by looking for whitespace after a newline. In other respects, it acts like wrap(). C<wrap()> compresses trailing whitespace into one newline, and C<fill()> deletes all trailing whitespace. Both C<wrap()> and C<fill()> return a single string. Unlike the old Unix fmt(1) utility, this module correctly accounts for any Unicode combining characters (such as diacriticals) that may occur in each line for both expansion and unexpansion. These are overstrike characters that do not increment the logical position. Make sure you have the appropriate Unicode settings enabled. =head1 OVERRIDES C<Text::Wrap::wrap()> has a number of variables that control its behavior. Because other modules might be using C<Text::Wrap::wrap()> it is suggested that you leave these variables alone! If you can't do that, then use C<local($Text::Wrap::VARIABLE) = YOURVALUE> when you change the values so that the original value is restored. This C<local()> trick will not work if you import the variable into your own namespace. Lines are wrapped at C<$Text::Wrap::columns> columns (default value: 76). C<$Text::Wrap::columns> should be set to the full width of your output device. In fact, every resulting line will have length of no more than C<$columns - 1>. It is possible to control which characters terminate words by modifying C<$Text::Wrap::break>. Set this to a string such as C<'[\s:]'> (to break before spaces or colons) or a pre-compiled regexp such as C<qr/[\s']/> (to break before spaces or apostrophes). The default is simply C<'\s'>; that is, words are terminated by spaces. (This means, among other things, that trailing punctuation such as full stops or commas stay with the word they are "attached" to.) Setting C<$Text::Wrap::break> to a regular expression that doesn't eat any characters (perhaps just a forward look-ahead assertion) will cause warnings. Beginner note: In example 2, above C<$columns> is imported into the local namespace, and set locally. In example 3, C<$Text::Wrap::columns> is set in its own namespace without importing it. C<Text::Wrap::wrap()> starts its work by expanding all the tabs in its input into spaces. The last thing it does it to turn spaces back into tabs. If you do not want tabs in your results, set C<$Text::Wrap::unexpand> to a false value. Likewise if you do not want to use 8-character tabstops, set C<$Text::Wrap::tabstop> to the number of characters you do want for your tabstops. If you want to separate your lines with something other than C<\n> then set C<$Text::Wrap::separator> to your preference. This replaces all newlines with C<$Text::Wrap::separator>. If you just want to preserve existing newlines but add new breaks with something else, set C<$Text::Wrap::separator2> instead. When words that are longer than C<$columns> are encountered, they are broken up. C<wrap()> adds a C<"\n"> at column C<$columns>. This behavior can be overridden by setting C<$huge> to 'die' or to 'overflow'. When set to 'die', large words will cause C<die()> to be called. When set to 'overflow', large words will be left intact. Historical notes: 'die' used to be the default value of C<$huge>. Now, 'wrap' is the default value. =head1 EXAMPLES Code: print wrap("\t","",<<END); This is a bit of text that forms a normal book-style indented paragraph END Result: " This is a bit of text that forms a normal book-style indented paragraph " Code: $Text::Wrap::columns=20; $Text::Wrap::separator="|"; print wrap("","","This is a bit of text that forms a normal book-style paragraph"); Result: "This is a bit of|text that forms a|normal book-style|paragraph" =head1 SUBVERSION This module comes in two flavors: one for modern perls (5.10 and above) and one for ancient obsolete perls. The version for modern perls has support for Unicode. The version for old perls does not. You can tell which version you have installed by looking at C<$Text::Wrap::SUBVERSION>: it is C<old> for obsolete perls and C<modern> for current perls. This man page is for the version for modern perls and so that's probably what you've got. =head1 SEE ALSO For correct handling of East Asian half- and full-width characters, see L<Text::WrapI18N>. For more detailed controls: L<Text::Format>. =head1 AUTHOR David Muir Sharnoff <cpan@dave.sharnoff.org> with help from Tim Pierce and many many others. =head1 LICENSE Copyright (C) 1996-2009 David Muir Sharnoff. Copyright (C) 2012-2013 Google, Inc. This module may be modified, used, copied, and redistributed at your own risk. Although allowed by the preceding license, please do not publicly redistribute modified versions of this code with the name "Text::Wrap" unless it passes the unmodified Text::Wrap test suite. Balanced.pm 0000644 00000204156 15137571474 0006621 0 ustar 00 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 = '2.03'; @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 Abbrev.pm 0000644 00000003771 15137571474 0006331 0 ustar 00 package Text::Abbrev; require 5.005; # Probably works on earlier versions too. require Exporter; our $VERSION = '1.02'; =head1 NAME Text::Abbrev - abbrev - create an abbreviation table from a list =head1 SYNOPSIS use Text::Abbrev; abbrev $hashref, LIST =head1 DESCRIPTION Stores all unambiguous truncations of each element of LIST as keys in the associative array referenced by C<$hashref>. The values are the original list elements. =head1 EXAMPLE $hashref = abbrev qw(list edit send abort gripe); %hash = abbrev qw(list edit send abort gripe); abbrev $hashref, qw(list edit send abort gripe); abbrev(*hash, qw(list edit send abort gripe)); =cut @ISA = qw(Exporter); @EXPORT = qw(abbrev); # Usage: # abbrev \%foo, LIST; # ... # $long = $foo{$short}; sub abbrev { my ($word, $hashref, $glob, %table, $returnvoid); @_ or return; # So we don't autovivify onto @_ and trigger warning if (ref($_[0])) { # hash reference preferably $hashref = shift; $returnvoid = 1; } elsif (ref \$_[0] eq 'GLOB') { # is actually a glob (deprecated) $hashref = \%{shift()}; $returnvoid = 1; } %{$hashref} = (); WORD: foreach $word (@_) { for (my $len = (length $word) - 1; $len > 0; --$len) { my $abbrev = substr($word,0,$len); my $seen = ++$table{$abbrev}; if ($seen == 1) { # We're the first word so far to have # this abbreviation. $hashref->{$abbrev} = $word; } elsif ($seen == 2) { # We're the second word to have this # abbreviation, so we can't use it. delete $hashref->{$abbrev}; } else { # We're the third word to have this # abbreviation, so skip to the next word. next WORD; } } } # Non-abbreviations always get entered, even if they aren't unique foreach $word (@_) { $hashref->{$word} = $word; } return if $returnvoid; if (wantarray) { %{$hashref}; } else { $hashref; } } 1; Termcap.pm 0000644 00000020236 15142047031 0006475 0 ustar 00 # Convert POD data to ASCII text with format escapes. # # This is a simple subclass of Pod::Text that overrides a few key methods to # output the right termcap escape sequences for formatted text on the current # terminal type. # # SPDX-License-Identifier: GPL-1.0-or-later OR Artistic-1.0-Perl ############################################################################## # Modules and declarations ############################################################################## package Pod::Text::Termcap; use 5.008; use strict; use warnings; use Pod::Text (); use POSIX (); use Term::Cap; use vars qw(@ISA $VERSION); @ISA = qw(Pod::Text); $VERSION = '4.14'; ############################################################################## # Overrides ############################################################################## # In the initialization method, grab our terminal characteristics as well as # do all the stuff we normally do. sub new { my ($self, %args) = @_; my ($ospeed, $term, $termios); # Fall back on a hard-coded terminal speed if POSIX::Termios isn't # available (such as on VMS). eval { $termios = POSIX::Termios->new }; if ($@) { $ospeed = 9600; } else { $termios->getattr; $ospeed = $termios->getospeed || 9600; } # Get data from Term::Cap if possible. my ($bold, $undl, $norm, $width); eval { my $term = Tgetent Term::Cap { TERM => undef, OSPEED => $ospeed }; $bold = $term->Tputs('md'); $undl = $term->Tputs('us'); $norm = $term->Tputs('me'); if (defined $$term{_co}) { $width = $$term{_co}; $width =~ s/^\#//; } }; # Figure out the terminal width before calling the Pod::Text constructor, # since it will otherwise force 76 characters. Pod::Text::Termcap has # historically used 2 characters less than the width of the screen, while # the other Pod::Text classes have used 76. This is weirdly inconsistent, # but there's probably no good reason to change it now. unless (defined $args{width}) { $args{width} = $ENV{COLUMNS} || $width || 80; $args{width} -= 2; } # Initialize Pod::Text. $self = $self->SUPER::new (%args); # If we were unable to get any of the formatting sequences, don't attempt # that type of formatting. This will do weird things if bold or underline # were available but normal wasn't, but hopefully that will never happen. $$self{BOLD} = $bold || q{}; $$self{UNDL} = $undl || q{}; $$self{NORM} = $norm || q{}; return $self; } # Make level one headings bold. sub cmd_head1 { my ($self, $attrs, $text) = @_; $text =~ s/\s+$//; $self->SUPER::cmd_head1 ($attrs, "$$self{BOLD}$text$$self{NORM}"); } # Make level two headings bold. sub cmd_head2 { my ($self, $attrs, $text) = @_; $text =~ s/\s+$//; $self->SUPER::cmd_head2 ($attrs, "$$self{BOLD}$text$$self{NORM}"); } # Fix up B<> and I<>. Note that we intentionally don't do F<>. sub cmd_b { my $self = shift; return "$$self{BOLD}$_[1]$$self{NORM}" } sub cmd_i { my $self = shift; return "$$self{UNDL}$_[1]$$self{NORM}" } # Return a regex that matches a formatting sequence. This will only be valid # if we were able to get at least some termcap information. sub format_regex { my ($self) = @_; my @codes = ($self->{BOLD}, $self->{UNDL}, $self->{NORM}); return join(q{|}, map { $_ eq q{} ? () : "\Q$_\E" } @codes); } # Analyze a single line and return any formatting codes in effect at the end # of that line. sub end_format { my ($self, $line) = @_; my $pattern = "(" . $self->format_regex() . ")"; my $current; while ($line =~ /$pattern/g) { my $code = $1; if ($code eq $$self{NORM}) { undef $current; } else { $current .= $code; } } return $current; } # Output any included code in bold. sub output_code { my ($self, $code) = @_; $self->output ($$self{BOLD} . $code . $$self{NORM}); } # Strip all of the formatting from a provided string, returning the stripped # version. sub strip_format { my ($self, $text) = @_; $text =~ s/\Q$$self{BOLD}//g; $text =~ s/\Q$$self{UNDL}//g; $text =~ s/\Q$$self{NORM}//g; return $text; } # Override the wrapping code to ignore the special sequences. sub wrap { my $self = shift; local $_ = shift; my $output = ''; my $spaces = ' ' x $$self{MARGIN}; my $width = $$self{opt_width} - $$self{MARGIN}; # If we were unable to find any termcap sequences, use Pod::Text wrapping. if ($self->{BOLD} eq q{} && $self->{UNDL} eq q{} && $self->{NORM} eq q{}) { return $self->SUPER::wrap($_); } # $code matches a single special sequence. $char matches any number of # special sequences preceding a single character other than a newline. # $shortchar matches some sequence of $char ending in codes followed by # whitespace or the end of the string. $longchar matches exactly $width # $chars, used when we have to truncate and hard wrap. my $code = "(?:" . $self->format_regex() . ")"; my $char = "(?>$code*[^\\n])"; my $shortchar = '^(' . $char . "{0,$width}(?>$code*)" . ')(?:\s+|\z)'; my $longchar = '^(' . $char . "{$width})"; while (length > $width) { if (s/$shortchar// || s/$longchar//) { $output .= $spaces . $1 . "\n"; } else { last; } } $output .= $spaces . $_; # less -R always resets terminal attributes at the end of each line, so we # need to clear attributes at the end of lines and then set them again at # the start of the next line. This requires a second pass through the # wrapped string, accumulating any attributes we see, remembering them, # and then inserting the appropriate sequences at the newline. if ($output =~ /\n/) { my @lines = split (/\n/, $output); my $start_format; for my $line (@lines) { if ($start_format && $line =~ /\S/) { $line =~ s/^(\s*)(\S)/$1$start_format$2/; } $start_format = $self->end_format ($line); if ($start_format) { $line .= $$self{NORM}; } } $output = join ("\n", @lines); } # Fix up trailing whitespace and return the results. $output =~ s/\s+$/\n\n/; return $output; } ############################################################################## # Module return value and documentation ############################################################################## 1; __END__ =head1 NAME Pod::Text::Termcap - Convert POD data to ASCII text with format escapes =for stopwords ECMA-48 VT100 Allbery Solaris TERMPATH =head1 SYNOPSIS use Pod::Text::Termcap; my $parser = Pod::Text::Termcap->new (sentence => 0, width => 78); # Read POD from STDIN and write to STDOUT. $parser->parse_from_filehandle; # Read POD from file.pod and write to file.txt. $parser->parse_from_file ('file.pod', 'file.txt'); =head1 DESCRIPTION Pod::Text::Termcap is a simple subclass of Pod::Text that highlights output text using the correct termcap escape sequences for the current terminal. Apart from the format codes, it in all ways functions like Pod::Text. See L<Pod::Text> for details and available options. This module uses L<Term::Cap> to find the correct terminal settings. See the documentation of that module for how it finds terminal database information and how to override that behavior if necessary. If unable to find control strings for bold and underscore formatting, that formatting is skipped, resulting in the same output as Pod::Text. =head1 AUTHOR Russ Allbery <rra@cpan.org> =head1 COPYRIGHT AND LICENSE Copyright 1999, 2001-2002, 2004, 2006, 2008-2009, 2014-2015, 2018-2019 Russ Allbery <rra@cpan.org> This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself. =head1 SEE ALSO L<Pod::Text>, L<Pod::Simple>, L<Term::Cap> The current version of this module is always available from its web site at L<https://www.eyrie.org/~eagle/software/podlators/>. It is also part of the Perl core distribution as of 5.6.0. =cut # Local Variables: # copyright-at-end-flag: t # End: Overstrike.pm 0000644 00000014163 15142047031 0007241 0 ustar 00 # Convert POD data to formatted overstrike text # # This was written because the output from: # # pod2text Text.pm > plain.txt; less plain.txt # # is not as rich as the output from # # pod2man Text.pm | nroff -man > fancy.txt; less fancy.txt # # and because both Pod::Text::Color and Pod::Text::Termcap are not device # independent. # # SPDX-License-Identifier: GPL-1.0-or-later OR Artistic-1.0-Perl ############################################################################## # Modules and declarations ############################################################################## package Pod::Text::Overstrike; use 5.008; use strict; use warnings; use vars qw(@ISA $VERSION); use Pod::Text (); @ISA = qw(Pod::Text); $VERSION = '4.14'; ############################################################################## # Overrides ############################################################################## # Make level one headings bold, overriding any existing formatting. sub cmd_head1 { my ($self, $attrs, $text) = @_; $text =~ s/\s+$//; $text = $self->strip_format ($text); $text =~ s/(.)/$1\b$1/g; return $self->SUPER::cmd_head1 ($attrs, $text); } # Make level two headings bold, overriding any existing formatting. sub cmd_head2 { my ($self, $attrs, $text) = @_; $text =~ s/\s+$//; $text = $self->strip_format ($text); $text =~ s/(.)/$1\b$1/g; return $self->SUPER::cmd_head2 ($attrs, $text); } # Make level three headings underscored, overriding any existing formatting. sub cmd_head3 { my ($self, $attrs, $text) = @_; $text =~ s/\s+$//; $text = $self->strip_format ($text); $text =~ s/(.)/_\b$1/g; return $self->SUPER::cmd_head3 ($attrs, $text); } # Level four headings look like level three headings. sub cmd_head4 { my ($self, $attrs, $text) = @_; $text =~ s/\s+$//; $text = $self->strip_format ($text); $text =~ s/(.)/_\b$1/g; return $self->SUPER::cmd_head4 ($attrs, $text); } # The common code for handling all headers. We have to override to avoid # interpolating twice and because we don't want to honor alt. sub heading { my ($self, $text, $indent, $marker) = @_; $self->item ("\n\n") if defined $$self{ITEM}; $text .= "\n" if $$self{opt_loose}; my $margin = ' ' x ($$self{opt_margin} + $indent); $self->output ($margin . $text . "\n"); return ''; } # Fix the various formatting codes. sub cmd_b { local $_ = $_[0]->strip_format ($_[2]); s/(.)/$1\b$1/g; $_ } sub cmd_f { local $_ = $_[0]->strip_format ($_[2]); s/(.)/_\b$1/g; $_ } sub cmd_i { local $_ = $_[0]->strip_format ($_[2]); s/(.)/_\b$1/g; $_ } # Output any included code in bold. sub output_code { my ($self, $code) = @_; $code =~ s/(.)/$1\b$1/g; $self->output ($code); } # Strip all of the formatting from a provided string, returning the stripped # version. sub strip_format { my ($self, $text) = @_; $text =~ s/(.)[\b]\1/$1/g; $text =~ s/_[\b]//g; return $text; } # We unfortunately have to override the wrapping code here, since the normal # wrapping code gets really confused by all the backspaces. sub wrap { my $self = shift; local $_ = shift; my $output = ''; my $spaces = ' ' x $$self{MARGIN}; my $width = $$self{opt_width} - $$self{MARGIN}; while (length > $width) { # This regex represents a single character, that's possibly underlined # or in bold (in which case, it's three characters; the character, a # backspace, and a character). Use [^\n] rather than . to protect # against odd settings of $*. my $char = '(?:[^\n][\b])?[^\n]'; if (s/^((?>$char){0,$width})(?:\Z|\s+)//) { $output .= $spaces . $1 . "\n"; } else { last; } } $output .= $spaces . $_; $output =~ s/\s+$/\n\n/; return $output; } ############################################################################## # Module return value and documentation ############################################################################## 1; __END__ =for stopwords overstrike overstruck Overstruck Allbery terminal's =head1 NAME Pod::Text::Overstrike - Convert POD data to formatted overstrike text =head1 SYNOPSIS use Pod::Text::Overstrike; my $parser = Pod::Text::Overstrike->new (sentence => 0, width => 78); # Read POD from STDIN and write to STDOUT. $parser->parse_from_filehandle; # Read POD from file.pod and write to file.txt. $parser->parse_from_file ('file.pod', 'file.txt'); =head1 DESCRIPTION Pod::Text::Overstrike is a simple subclass of Pod::Text that highlights output text using overstrike sequences, in a manner similar to nroff. Characters in bold text are overstruck (character, backspace, character) and characters in underlined text are converted to overstruck underscores (underscore, backspace, character). This format was originally designed for hard-copy terminals and/or line printers, yet is readable on soft-copy (CRT) terminals. Overstruck text is best viewed by page-at-a-time programs that take advantage of the terminal's B<stand-out> and I<underline> capabilities, such as the less program on Unix. Apart from the overstrike, it in all ways functions like Pod::Text. See L<Pod::Text> for details and available options. =head1 BUGS Currently, the outermost formatting instruction wins, so for example underlined text inside a region of bold text is displayed as simply bold. There may be some better approach possible. =head1 AUTHOR Originally written by Joe Smith <Joe.Smith@inwap.com>, using the framework created by Russ Allbery <rra@cpan.org>. Subsequently updated by Russ Allbery. =head1 COPYRIGHT AND LICENSE Copyright 2000 by Joe Smith <Joe.Smith@inwap.com> Copyright 2001, 2004, 2008, 2014, 2018-2019 by Russ Allbery <rra@cpan.org> This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself. =head1 SEE ALSO L<Pod::Text>, L<Pod::Simple> The current version of this module is always available from its web site at L<https://www.eyrie.org/~eagle/software/podlators/>. It is also part of the Perl core distribution as of 5.6.0. =cut # Local Variables: # copyright-at-end-flag: t # End: Color.pm 0000644 00000013636 15142047031 0006166 0 ustar 00 # Convert POD data to formatted color ASCII text # # This is just a basic proof of concept. It should later be modified to make # better use of color, take options changing what colors are used for what # text, and the like. # # SPDX-License-Identifier: GPL-1.0-or-later OR Artistic-1.0-Perl ############################################################################## # Modules and declarations ############################################################################## package Pod::Text::Color; use 5.008; use strict; use warnings; use Pod::Text (); use Term::ANSIColor qw(color colored); use vars qw(@ISA $VERSION); @ISA = qw(Pod::Text); $VERSION = '4.14'; ############################################################################## # Overrides ############################################################################## # Make level one headings bold. sub cmd_head1 { my ($self, $attrs, $text) = @_; $text =~ s/\s+$//; local $Term::ANSIColor::EACHLINE = "\n"; $self->SUPER::cmd_head1 ($attrs, colored ($text, 'bold')); } # Make level two headings bold. sub cmd_head2 { my ($self, $attrs, $text) = @_; $text =~ s/\s+$//; $self->SUPER::cmd_head2 ($attrs, colored ($text, 'bold')); } # Fix the various formatting codes. sub cmd_b { return colored ($_[2], 'bold') } sub cmd_f { return colored ($_[2], 'cyan') } sub cmd_i { return colored ($_[2], 'yellow') } # Analyze a single line and return any formatting codes in effect at the end # of that line. sub end_format { my ($self, $line) = @_; my $reset = color ('reset'); my $current; while ($line =~ /(\e\[[\d;]+m)/g) { my $code = $1; if ($code eq $reset) { undef $current; } else { $current .= $code; } } return $current; } # Output any included code in green. sub output_code { my ($self, $code) = @_; local $Term::ANSIColor::EACHLINE = "\n"; $code = colored ($code, 'green'); $self->output ($code); } # Strip all of the formatting from a provided string, returning the stripped # version. We will eventually want to use colorstrip() from Term::ANSIColor, # but it's fairly new so avoid the tight dependency. sub strip_format { my ($self, $text) = @_; $text =~ s/\e\[[\d;]*m//g; return $text; } # We unfortunately have to override the wrapping code here, since the normal # wrapping code gets really confused by all the escape sequences. sub wrap { my $self = shift; local $_ = shift; my $output = ''; my $spaces = ' ' x $$self{MARGIN}; my $width = $$self{opt_width} - $$self{MARGIN}; # $codes matches a single special sequence. $char matches any number of # special sequences preceding a single character other than a newline. # $shortchar matches some sequence of $char ending in codes followed by # whitespace or the end of the string. $longchar matches exactly $width # $chars, used when we have to truncate and hard wrap. my $code = '(?:\e\[[\d;]+m)'; my $char = "(?>$code*[^\\n])"; my $shortchar = '^(' . $char . "{0,$width}(?>$code*)" . ')(?:\s+|\z)'; my $longchar = '^(' . $char . "{$width})"; while (length > $width) { if (s/$shortchar// || s/$longchar//) { $output .= $spaces . $1 . "\n"; } else { last; } } $output .= $spaces . $_; # less -R always resets terminal attributes at the end of each line, so we # need to clear attributes at the end of lines and then set them again at # the start of the next line. This requires a second pass through the # wrapped string, accumulating any attributes we see, remembering them, # and then inserting the appropriate sequences at the newline. if ($output =~ /\n/) { my @lines = split (/\n/, $output); my $start_format; for my $line (@lines) { if ($start_format && $line =~ /\S/) { $line =~ s/^(\s*)(\S)/$1$start_format$2/; } $start_format = $self->end_format ($line); if ($start_format) { $line .= color ('reset'); } } $output = join ("\n", @lines); } # Fix up trailing whitespace and return the results. $output =~ s/\s+$/\n\n/; $output; } ############################################################################## # Module return value and documentation ############################################################################## 1; __END__ =for stopwords Allbery =head1 NAME Pod::Text::Color - Convert POD data to formatted color ASCII text =head1 SYNOPSIS use Pod::Text::Color; my $parser = Pod::Text::Color->new (sentence => 0, width => 78); # Read POD from STDIN and write to STDOUT. $parser->parse_from_filehandle; # Read POD from file.pod and write to file.txt. $parser->parse_from_file ('file.pod', 'file.txt'); =head1 DESCRIPTION Pod::Text::Color is a simple subclass of Pod::Text that highlights output text using ANSI color escape sequences. Apart from the color, it in all ways functions like Pod::Text. See L<Pod::Text> for details and available options. Term::ANSIColor is used to get colors and therefore must be installed to use this module. =head1 BUGS This is just a basic proof of concept. It should be seriously expanded to support configurable coloration via options passed to the constructor, and B<pod2text> should be taught about those. =head1 AUTHOR Russ Allbery <rra@cpan.org>. =head1 COPYRIGHT AND LICENSE Copyright 1999, 2001, 2004, 2006, 2008, 2009, 2018-2019 Russ Allbery <rra@cpan.org> This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself. =head1 SEE ALSO L<Pod::Text>, L<Pod::Simple> The current version of this module is always available from its web site at L<https://www.eyrie.org/~eagle/software/podlators/>. It is also part of the Perl core distribution as of 5.6.0. =cut # Local Variables: # copyright-at-end-flag: t # End:
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