ndk/prebuilt/linux-x86_64/lib/perl5/5.16.2/Pod/PlainText.pm

   1 # Pod::PlainText -- Convert POD data to formatted ASCII text.
   2 # $Id: Text.pm,v 2.1 1999/09/20 11:53:33 eagle Exp $
   3 #
   4 # Copyright 1999-2000 by Russ Allbery <rra@stanford.edu>
   5 #
   6 # This program is free software; you can redistribute it and/or modify it
   7 # under the same terms as Perl itself.
   8 #
   9 # This module is intended to be a replacement for Pod::Text, and attempts to
  10 # match its output except for some specific circumstances where other
  11 # decisions seemed to produce better output.  It uses Pod::Parser and is
  12 # designed to be very easy to subclass.
  13
  14 ############################################################################
  15 # Modules and declarations
  16 ############################################################################
  17
  18 package Pod::PlainText;
  19 use strict;
  20
  21 require 5.005;
  22
  23 use Carp qw(carp croak);
  24 use Pod::Select ();
  25
  26 use vars qw(@ISA %ESCAPES $VERSION);
  27
  28 # We inherit from Pod::Select instead of Pod::Parser so that we can be used
  29 # by Pod::Usage.
  30 @ISA = qw(Pod::Select);
  31
  32 $VERSION = '2.05';
  33
  34 BEGIN {
  35    if ($] < 5.006) {
  36       require Symbol;
  37       import Symbol;
  38    }
  39 }
  40
  41 ############################################################################
  42 # Table of supported E<> escapes
  43 ############################################################################
  44
  45 # This table is taken near verbatim from Pod::PlainText in Pod::Parser,
  46 # which got it near verbatim from the original Pod::Text.  It is therefore
  47 # credited to Tom Christiansen, and I'm glad I didn't have to write it.  :)
  48 %ESCAPES = (
  49     'amp'       =>    '&',      # ampersand
  50     'lt'        =>    '<',      # left chevron, less-than
  51     'gt'        =>    '>',      # right chevron, greater-than
  52     'quot'      =>    '"',      # double quote
  53
  54     "Aacute"    =>    "\xC1",   # capital A, acute accent
  55     "aacute"    =>    "\xE1",   # small a, acute accent
  56     "Acirc"     =>    "\xC2",   # capital A, circumflex accent
  57     "acirc"     =>    "\xE2",   # small a, circumflex accent
  58     "AElig"     =>    "\xC6",   # capital AE diphthong (ligature)
  59     "aelig"     =>    "\xE6",   # small ae diphthong (ligature)
  60     "Agrave"    =>    "\xC0",   # capital A, grave accent
  61     "agrave"    =>    "\xE0",   # small a, grave accent
  62     "Aring"     =>    "\xC5",   # capital A, ring
  63     "aring"     =>    "\xE5",   # small a, ring
  64     "Atilde"    =>    "\xC3",   # capital A, tilde
  65     "atilde"    =>    "\xE3",   # small a, tilde
  66     "Auml"      =>    "\xC4",   # capital A, dieresis or umlaut mark
  67     "auml"      =>    "\xE4",   # small a, dieresis or umlaut mark
  68     "Ccedil"    =>    "\xC7",   # capital C, cedilla
  69     "ccedil"    =>    "\xE7",   # small c, cedilla
  70     "Eacute"    =>    "\xC9",   # capital E, acute accent
  71     "eacute"    =>    "\xE9",   # small e, acute accent
  72     "Ecirc"     =>    "\xCA",   # capital E, circumflex accent
  73     "ecirc"     =>    "\xEA",   # small e, circumflex accent
  74     "Egrave"    =>    "\xC8",   # capital E, grave accent
  75     "egrave"    =>    "\xE8",   # small e, grave accent
  76     "ETH"       =>    "\xD0",   # capital Eth, Icelandic
  77     "eth"       =>    "\xF0",   # small eth, Icelandic
  78     "Euml"      =>    "\xCB",   # capital E, dieresis or umlaut mark
  79     "euml"      =>    "\xEB",   # small e, dieresis or umlaut mark
  80     "Iacute"    =>    "\xCD",   # capital I, acute accent
  81     "iacute"    =>    "\xED",   # small i, acute accent
  82     "Icirc"     =>    "\xCE",   # capital I, circumflex accent
  83     "icirc"     =>    "\xEE",   # small i, circumflex accent
  84     "Igrave"    =>    "\xCD",   # capital I, grave accent
  85     "igrave"    =>    "\xED",   # small i, grave accent
  86     "Iuml"      =>    "\xCF",   # capital I, dieresis or umlaut mark
  87     "iuml"      =>    "\xEF",   # small i, dieresis or umlaut mark
  88     "Ntilde"    =>    "\xD1",   # capital N, tilde
  89     "ntilde"    =>    "\xF1",   # small n, tilde
  90     "Oacute"    =>    "\xD3",   # capital O, acute accent
  91     "oacute"    =>    "\xF3",   # small o, acute accent
  92     "Ocirc"     =>    "\xD4",   # capital O, circumflex accent
  93     "ocirc"     =>    "\xF4",   # small o, circumflex accent
  94     "Ograve"    =>    "\xD2",   # capital O, grave accent
  95     "ograve"    =>    "\xF2",   # small o, grave accent
  96     "Oslash"    =>    "\xD8",   # capital O, slash
  97     "oslash"    =>    "\xF8",   # small o, slash
  98     "Otilde"    =>    "\xD5",   # capital O, tilde
  99     "otilde"    =>    "\xF5",   # small o, tilde
 100     "Ouml"      =>    "\xD6",   # capital O, dieresis or umlaut mark
 101     "ouml"      =>    "\xF6",   # small o, dieresis or umlaut mark
 102     "szlig"     =>    "\xDF",   # small sharp s, German (sz ligature)
 103     "THORN"     =>    "\xDE",   # capital THORN, Icelandic
 104     "thorn"     =>    "\xFE",   # small thorn, Icelandic
 105     "Uacute"    =>    "\xDA",   # capital U, acute accent
 106     "uacute"    =>    "\xFA",   # small u, acute accent
 107     "Ucirc"     =>    "\xDB",   # capital U, circumflex accent
 108     "ucirc"     =>    "\xFB",   # small u, circumflex accent
 109     "Ugrave"    =>    "\xD9",   # capital U, grave accent
 110     "ugrave"    =>    "\xF9",   # small u, grave accent
 111     "Uuml"      =>    "\xDC",   # capital U, dieresis or umlaut mark
 112     "uuml"      =>    "\xFC",   # small u, dieresis or umlaut mark
 113     "Yacute"    =>    "\xDD",   # capital Y, acute accent
 114     "yacute"    =>    "\xFD",   # small y, acute accent
 115     "yuml"      =>    "\xFF",   # small y, dieresis or umlaut mark
 116
 117     "lchevron"  =>    "\xAB",   # left chevron (double less than)
 118     "rchevron"  =>    "\xBB",   # right chevron (double greater than)
 119 );
 120
 121
 122 ############################################################################
 123 # Initialization
 124 ############################################################################
 125
 126 # Initialize the object.  Must be sure to call our parent initializer.
 127 sub initialize {
 128     my $self = shift;
 129
 130     $$self{alt}      = 0  unless defined $$self{alt};
 131     $$self{indent}   = 4  unless defined $$self{indent};
 132     $$self{loose}    = 0  unless defined $$self{loose};
 133     $$self{sentence} = 0  unless defined $$self{sentence};
 134     $$self{width}    = 76 unless defined $$self{width};
 135
 136     $$self{INDENTS}  = [];              # Stack of indentations.
 137     $$self{MARGIN}   = $$self{indent};  # Current left margin in spaces.
 138
 139     return $self->SUPER::initialize;
 140 }
 141
 142
 143 ############################################################################
 144 # Core overrides
 145 ############################################################################
 146
 147 # Called for each command paragraph.  Gets the command, the associated
 148 # paragraph, the line number, and a Pod::Paragraph object.  Just dispatches
 149 # the command to a method named the same as the command.  =cut is handled
 150 # internally by Pod::Parser.
 151 sub command {
 152     my $self = shift;
 153     my $command = shift;
 154     return if $command eq 'pod';
 155     return if ($$self{EXCLUDE} && $command ne 'end');
 156     if (defined $$self{ITEM}) {
 157       $self->item ("\n");
 158       local $_ = "\n";
 159       $self->output($_) if($command eq 'back');
 160     }
 161     $command = 'cmd_' . $command;
 162     return $self->$command (@_);
 163 }
 164
 165 # Called for a verbatim paragraph.  Gets the paragraph, the line number, and
 166 # a Pod::Paragraph object.  Just output it verbatim, but with tabs converted
 167 # to spaces.
 168 sub verbatim {
 169     my $self = shift;
 170     return if $$self{EXCLUDE};
 171     $self->item if defined $$self{ITEM};
 172     local $_ = shift;
 173     return if /^\s*$/;
 174     s/^(\s*\S+)/(' ' x $$self{MARGIN}) . $1/gme;
 175     return $self->output($_);
 176 }
 177
 178 # Called for a regular text block.  Gets the paragraph, the line number, and
 179 # a Pod::Paragraph object.  Perform interpolation and output the results.
 180 sub textblock {
 181     my $self = shift;
 182     return if $$self{EXCLUDE};
 183     if($$self{VERBATIM}) {
 184       $self->output($_[0]);
 185       return;
 186     }
 187     local $_ = shift;
 188     my $line = shift;
 189
 190     # Perform a little magic to collapse multiple L<> references.  This is
 191     # here mostly for backwards-compatibility.  We'll just rewrite the whole
 192     # thing into actual text at this part, bypassing the whole internal
 193     # sequence parsing thing.
 194     s{
 195         (
 196           L<                    # A link of the form L</something>.
 197               /
 198               (
 199                   [:\w]+        # The item has to be a simple word...
 200                   (\(\))?       # ...or simple function.
 201               )
 202           >
 203           (
 204               ,?\s+(and\s+)?    # Allow lots of them, conjuncted.
 205               L<
 206                   /
 207                   (
 208                       [:\w]+
 209                       (\(\))?
 210                   )
 211               >
 212           )+
 213         )
 214     } {
 215         local $_ = $1;
 216         s%L</([^>]+)>%$1%g;
 217         my @items = split /(?:,?\s+(?:and\s+)?)/;
 218         my $string = "the ";
 219         my $i;
 220         for ($i = 0; $i < @items; $i++) {
 221             $string .= $items[$i];
 222             $string .= ", " if @items > 2 && $i != $#items;
 223             $string .= " and " if ($i == $#items - 1);
 224         }
 225         $string .= " entries elsewhere in this document";
 226         $string;
 227     }gex;
 228
 229     # Now actually interpolate and output the paragraph.
 230     $_ = $self->interpolate ($_, $line);
 231     s/\s*$/\n/s;
 232     if (defined $$self{ITEM}) {
 233         $self->item ($_ . "\n");
 234     } else {
 235         $self->output ($self->reformat ($_ . "\n"));
 236     }
 237 }
 238
 239 # Called for an interior sequence.  Gets the command, argument, and a
 240 # Pod::InteriorSequence object and is expected to return the resulting text.
 241 # Calls code, bold, italic, file, and link to handle those types of
 242 # sequences, and handles S<>, E<>, X<>, and Z<> directly.
 243 sub interior_sequence {
 244     my $self = shift;
 245     my $command = shift;
 246     local $_ = shift;
 247     return '' if ($command eq 'X' || $command eq 'Z');
 248
 249     # Expand escapes into the actual character now, carping if invalid.
 250     if ($command eq 'E') {
 251         return $ESCAPES{$_} if defined $ESCAPES{$_};
 252         carp "Unknown escape: E<$_>";
 253         return "E<$_>";
 254     }
 255
 256     # For all the other sequences, empty content produces no output.
 257     return if $_ eq '';
 258
 259     # For S<>, compress all internal whitespace and then map spaces to \01.
 260     # When we output the text, we'll map this back.
 261     if ($command eq 'S') {
 262         s/\s{2,}/ /g;
 263         tr/ /\01/;
 264         return $_;
 265     }
 266
 267     # Anything else needs to get dispatched to another method.
 268     if    ($command eq 'B') { return $self->seq_b ($_) }
 269     elsif ($command eq 'C') { return $self->seq_c ($_) }
 270     elsif ($command eq 'F') { return $self->seq_f ($_) }
 271     elsif ($command eq 'I') { return $self->seq_i ($_) }
 272     elsif ($command eq 'L') { return $self->seq_l ($_) }
 273     else { carp "Unknown sequence $command<$_>" }
 274 }
 275
 276 # Called for each paragraph that's actually part of the POD.  We take
 277 # advantage of this opportunity to untabify the input.
 278 sub preprocess_paragraph {
 279     my $self = shift;
 280     local $_ = shift;
 281     1 while s/^(.*?)(\t+)/$1 . ' ' x (length ($2) * 8 - length ($1) % 8)/me;
 282     return $_;
 283 }
 284
 285
 286 ############################################################################
 287 # Command paragraphs
 288 ############################################################################
 289
 290 # All command paragraphs take the paragraph and the line number.
 291
 292 # First level heading.
 293 sub cmd_head1 {
 294     my $self = shift;
 295     local $_ = shift;
 296     s/\s+$//s;
 297     $_ = $self->interpolate ($_, shift);
 298     if ($$self{alt}) {
 299         $self->output ("\n==== $_ ====\n\n");
 300     } else {
 301         $_ .= "\n" if $$self{loose};
 302         $self->output ($_ . "\n");
 303     }
 304 }
 305
 306 # Second level heading.
 307 sub cmd_head2 {
 308     my $self = shift;
 309     local $_ = shift;
 310     s/\s+$//s;
 311     $_ = $self->interpolate ($_, shift);
 312     if ($$self{alt}) {
 313         $self->output ("\n==   $_   ==\n\n");
 314     } else {
 315         $_ .= "\n" if $$self{loose};
 316         $self->output (' ' x ($$self{indent} / 2) . $_ . "\n");
 317     }
 318 }
 319
 320 # third level heading - not strictly perlpodspec compliant
 321 sub cmd_head3 {
 322     my $self = shift;
 323     local $_ = shift;
 324     s/\s+$//s;
 325     $_ = $self->interpolate ($_, shift);
 326     if ($$self{alt}) {
 327         $self->output ("\n= $_ =\n");
 328     } else {
 329         $_ .= "\n" if $$self{loose};
 330         $self->output (' ' x ($$self{indent}) . $_ . "\n");
 331     }
 332 }
 333
 334 # fourth level heading - not strictly perlpodspec compliant
 335 # just like head3
 336 *cmd_head4 = \&cmd_head3;
 337
 338 # Start a list.
 339 sub cmd_over {
 340     my $self = shift;
 341     local $_ = shift;
 342     unless (/^[-+]?\d+\s+$/) { $_ = $$self{indent} }
 343     push (@{ $$self{INDENTS} }, $$self{MARGIN});
 344     $$self{MARGIN} += ($_ + 0);
 345 }
 346
 347 # End a list.
 348 sub cmd_back {
 349     my $self = shift;
 350     $$self{MARGIN} = pop @{ $$self{INDENTS} };
 351     unless (defined $$self{MARGIN}) {
 352         carp 'Unmatched =back';
 353         $$self{MARGIN} = $$self{indent};
 354     }
 355 }
 356
 357 # An individual list item.
 358 sub cmd_item {
 359     my $self = shift;
 360     if (defined $$self{ITEM}) { $self->item }
 361     local $_ = shift;
 362     s/\s+$//s;
 363     $$self{ITEM} = $self->interpolate ($_);
 364 }
 365
 366 # Begin a block for a particular translator.  Setting VERBATIM triggers
 367 # special handling in textblock().
 368 sub cmd_begin {
 369     my $self = shift;
 370     local $_ = shift;
 371     my ($kind) = /^(\S+)/ or return;
 372     if ($kind eq 'text') {
 373         $$self{VERBATIM} = 1;
 374     } else {
 375         $$self{EXCLUDE} = 1;
 376     }
 377 }
 378
 379 # End a block for a particular translator.  We assume that all =begin/=end
 380 # pairs are properly closed.
 381 sub cmd_end {
 382     my $self = shift;
 383     $$self{EXCLUDE} = 0;
 384     $$self{VERBATIM} = 0;
 385 }
 386
 387 # One paragraph for a particular translator.  Ignore it unless it's intended
 388 # for text, in which case we treat it as a verbatim text block.
 389 sub cmd_for {
 390     my $self = shift;
 391     local $_ = shift;
 392     my $line = shift;
 393     return unless s/^text\b[ \t]*\r?\n?//;
 394     $self->verbatim ($_, $line);
 395 }
 396
 397
 398 ############################################################################
 399 # Interior sequences
 400 ############################################################################
 401
 402 # The simple formatting ones.  These are here mostly so that subclasses can
 403 # override them and do more complicated things.
 404 sub seq_b { return $_[0]{alt} ? "``$_[1]''" : $_[1] }
 405 sub seq_c { return $_[0]{alt} ? "``$_[1]''" : "`$_[1]'" }
 406 sub seq_f { return $_[0]{alt} ? "\"$_[1]\"" : $_[1] }
 407 sub seq_i { return '*' . $_[1] . '*' }
 408
 409 # The complicated one.  Handle links.  Since this is plain text, we can't
 410 # actually make any real links, so this is all to figure out what text we
 411 # print out.
 412 sub seq_l {
 413     my $self = shift;
 414     local $_ = shift;
 415
 416     # Smash whitespace in case we were split across multiple lines.
 417     s/\s+/ /g;
 418
 419     # If we were given any explicit text, just output it.
 420     if (/^([^|]+)\|/) { return $1 }
 421
 422     # Okay, leading and trailing whitespace isn't important; get rid of it.
 423     s/^\s+//;
 424     s/\s+$//;
 425
 426     # Default to using the whole content of the link entry as a section
 427     # name.  Note that L<manpage/> forces a manpage interpretation, as does
 428     # something looking like L<manpage(section)>.  The latter is an
 429     # enhancement over the original Pod::Text.
 430     my ($manpage, $section) = ('', $_);
 431     if (/^(?:https?|ftp|news):/) {
 432         # a URL
 433         return $_;
 434     } elsif (/^"\s*(.*?)\s*"$/) {
 435         $section = '"' . $1 . '"';
 436     } elsif (m/^[-:.\w]+(?:\(\S+\))?$/) {
 437         ($manpage, $section) = ($_, '');
 438     } elsif (m{/}) {
 439         ($manpage, $section) = split (/\s*\/\s*/, $_, 2);
 440     }
 441
 442     my $text = '';
 443     # Now build the actual output text.
 444     if (!length $section) {
 445         $text = "the $manpage manpage" if length $manpage;
 446     } elsif ($section =~ /^[:\w]+(?:\(\))?/) {
 447         $text .= 'the ' . $section . ' entry';
 448         $text .= (length $manpage) ? " in the $manpage manpage"
 449                                    : ' elsewhere in this document';
 450     } else {
 451         $section =~ s/^\"\s*//;
 452         $section =~ s/\s*\"$//;
 453         $text .= 'the section on "' . $section . '"';
 454         $text .= " in the $manpage manpage" if length $manpage;
 455     }
 456     return $text;
 457 }
 458
 459
 460 ############################################################################
 461 # List handling
 462 ############################################################################
 463
 464 # This method is called whenever an =item command is complete (in other
 465 # words, we've seen its associated paragraph or know for certain that it
 466 # doesn't have one).  It gets the paragraph associated with the item as an
 467 # argument.  If that argument is empty, just output the item tag; if it
 468 # contains a newline, output the item tag followed by the newline.
 469 # Otherwise, see if there's enough room for us to output the item tag in the
 470 # margin of the text or if we have to put it on a separate line.
 471 sub item {
 472     my $self = shift;
 473     local $_ = shift;
 474     my $tag = $$self{ITEM};
 475     unless (defined $tag) {
 476         carp 'item called without tag';
 477         return;
 478     }
 479     undef $$self{ITEM};
 480     my $indent = $$self{INDENTS}[-1];
 481     unless (defined $indent) { $indent = $$self{indent} }
 482     my $space = ' ' x $indent;
 483     $space =~ s/^ /:/ if $$self{alt};
 484     if (!$_ || /^\s+$/ || ($$self{MARGIN} - $indent < length ($tag) + 1)) {
 485         my $margin = $$self{MARGIN};
 486         $$self{MARGIN} = $indent;
 487         my $output = $self->reformat ($tag);
 488         $output =~ s/[\r\n]*$/\n/;
 489         $self->output ($output);
 490         $$self{MARGIN} = $margin;
 491         $self->output ($self->reformat ($_)) if /\S/;
 492     } else {
 493         $_ = $self->reformat ($_);
 494         s/^ /:/ if ($$self{alt} && $indent > 0);
 495         my $tagspace = ' ' x length $tag;
 496         s/^($space)$tagspace/$1$tag/ or carp 'Bizarre space in item';
 497         $self->output ($_);
 498     }
 499 }
 500
 501
 502 ############################################################################
 503 # Output formatting
 504 ############################################################################
 505
 506 # Wrap a line, indenting by the current left margin.  We can't use
 507 # Text::Wrap because it plays games with tabs.  We can't use formline, even
 508 # though we'd really like to, because it screws up non-printing characters.
 509 # So we have to do the wrapping ourselves.
 510 sub wrap {
 511     my $self = shift;
 512     local $_ = shift;
 513     my $output = '';
 514     my $spaces = ' ' x $$self{MARGIN};
 515     my $width = $$self{width} - $$self{MARGIN};
 516     while (length > $width) {
 517         if (s/^([^\r\n]{0,$width})\s+// || s/^([^\r\n]{$width})//) {
 518             $output .= $spaces . $1 . "\n";
 519         } else {
 520             last;
 521         }
 522     }
 523     $output .= $spaces . $_;
 524     $output =~ s/\s+$/\n\n/;
 525     return $output;
 526 }
 527
 528 # Reformat a paragraph of text for the current margin.  Takes the text to
 529 # reformat and returns the formatted text.
 530 sub reformat {
 531     my $self = shift;
 532     local $_ = shift;
 533
 534     # If we're trying to preserve two spaces after sentences, do some
 535     # munging to support that.  Otherwise, smash all repeated whitespace.
 536     if ($$self{sentence}) {
 537         s/ +$//mg;
 538         s/\.\r?\n/. \n/g;
 539         s/[\r\n]+/ /g;
 540         s/   +/  /g;
 541     } else {
 542         s/\s+/ /g;
 543     }
 544     return $self->wrap($_);
 545 }
 546
 547 # Output text to the output device.
 548 sub output { $_[1] =~ tr/\01/ /; print { $_[0]->output_handle } $_[1] }
 549
 550
 551 ############################################################################
 552 # Backwards compatibility
 553 ############################################################################
 554
 555 # The old Pod::Text module did everything in a pod2text() function.  This
 556 # tries to provide the same interface for legacy applications.
 557 sub pod2text {
 558     my @args;
 559
 560     # This is really ugly; I hate doing option parsing in the middle of a
 561     # module.  But the old Pod::Text module supported passing flags to its
 562     # entry function, so handle -a and -<number>.
 563     while ($_[0] =~ /^-/) {
 564         my $flag = shift;
 565         if    ($flag eq '-a')       { push (@args, alt => 1)    }
 566         elsif ($flag =~ /^-(\d+)$/) { push (@args, width => $1) }
 567         else {
 568             unshift (@_, $flag);
 569             last;
 570         }
 571     }
 572
 573     # Now that we know what arguments we're using, create the parser.
 574     my $parser = Pod::PlainText->new (@args);
 575
 576     # If two arguments were given, the second argument is going to be a file
 577     # handle.  That means we want to call parse_from_filehandle(), which
 578     # means we need to turn the first argument into a file handle.  Magic
 579     # open will handle the <&STDIN case automagically.
 580     if (defined $_[1]) {
 581         my $infh;
 582         if ($] < 5.006) {
 583           $infh = gensym();
 584         }
 585         unless (open ($infh, $_[0])) {
 586             croak ("Can't open $_[0] for reading: $!\n");
 587         }
 588         $_[0] = $infh;
 589         return $parser->parse_from_filehandle (@_);
 590     } else {
 591         return $parser->parse_from_file (@_);
 592     }
 593 }
 594
 595
 596 ############################################################################
 597 # Module return value and documentation
 598 ############################################################################
 599
 600 1;
 601 __END__
 602
 603 =head1 NAME
 604
 605 Pod::PlainText - Convert POD data to formatted ASCII text
 606
 607 =head1 SYNOPSIS
 608
 609     use Pod::PlainText;
 610     my $parser = Pod::PlainText->new (sentence => 0, width => 78);
 611
 612     # Read POD from STDIN and write to STDOUT.
 613     $parser->parse_from_filehandle;
 614
 615     # Read POD from file.pod and write to file.txt.
 616     $parser->parse_from_file ('file.pod', 'file.txt');
 617
 618 =head1 DESCRIPTION
 619
 620 Pod::PlainText is a module that can convert documentation in the POD format (the
 621 preferred language for documenting Perl) into formatted ASCII.  It uses no
 622 special formatting controls or codes whatsoever, and its output is therefore
 623 suitable for nearly any device.
 624
 625 As a derived class from Pod::Parser, Pod::PlainText supports the same methods and
 626 interfaces.  See L<Pod::Parser> for all the details; briefly, one creates a
 627 new parser with C<Pod::PlainText-E<gt>new()> and then calls either
 628 parse_from_filehandle() or parse_from_file().
 629
 630 new() can take options, in the form of key/value pairs, that control the
 631 behavior of the parser.  The currently recognized options are:
 632
 633 =over 4
 634
 635 =item alt
 636
 637 If set to a true value, selects an alternate output format that, among other
 638 things, uses a different heading style and marks C<=item> entries with a
 639 colon in the left margin.  Defaults to false.
 640
 641 =item indent
 642
 643 The number of spaces to indent regular text, and the default indentation for
 644 C<=over> blocks.  Defaults to 4.
 645
 646 =item loose
 647
 648 If set to a true value, a blank line is printed after a C<=headN> headings.
 649 If set to false (the default), no blank line is printed after C<=headN>.
 650 This is the default because it's the expected formatting for manual pages;
 651 if you're formatting arbitrary text documents, setting this to true may
 652 result in more pleasing output.
 653
 654 =item sentence
 655
 656 If set to a true value, Pod::PlainText will assume that each sentence ends in two
 657 spaces, and will try to preserve that spacing.  If set to false, all
 658 consecutive whitespace in non-verbatim paragraphs is compressed into a
 659 single space.  Defaults to true.
 660
 661 =item width
 662
 663 The column at which to wrap text on the right-hand side.  Defaults to 76.
 664
 665 =back
 666
 667 The standard Pod::Parser method parse_from_filehandle() takes up to two
 668 arguments, the first being the file handle to read POD from and the second
 669 being the file handle to write the formatted output to.  The first defaults
 670 to STDIN if not given, and the second defaults to STDOUT.  The method
 671 parse_from_file() is almost identical, except that its two arguments are the
 672 input and output disk files instead.  See L<Pod::Parser> for the specific
 673 details.
 674
 675 =head1 DIAGNOSTICS
 676
 677 =over 4
 678
 679 =item Bizarre space in item
 680
 681 (W) Something has gone wrong in internal C<=item> processing.  This message
 682 indicates a bug in Pod::PlainText; you should never see it.
 683
 684 =item Can't open %s for reading: %s
 685
 686 (F) Pod::PlainText was invoked via the compatibility mode pod2text() interface
 687 and the input file it was given could not be opened.
 688
 689 =item Unknown escape: %s
 690
 691 (W) The POD source contained an C<EE<lt>E<gt>> escape that Pod::PlainText didn't
 692 know about.
 693
 694 =item Unknown sequence: %s
 695
 696 (W) The POD source contained a non-standard internal sequence (something of
 697 the form C<XE<lt>E<gt>>) that Pod::PlainText didn't know about.
 698
 699 =item Unmatched =back
 700
 701 (W) Pod::PlainText encountered a C<=back> command that didn't correspond to an
 702 C<=over> command.
 703
 704 =back
 705
 706 =head1 RESTRICTIONS
 707
 708 Embedded Ctrl-As (octal 001) in the input will be mapped to spaces on
 709 output, due to an internal implementation detail.
 710
 711 =head1 NOTES
 712
 713 This is a replacement for an earlier Pod::Text module written by Tom
 714 Christiansen.  It has a revamped interface, since it now uses Pod::Parser,
 715 but an interface roughly compatible with the old Pod::Text::pod2text()
 716 function is still available.  Please change to the new calling convention,
 717 though.
 718
 719 The original Pod::Text contained code to do formatting via termcap
 720 sequences, although it wasn't turned on by default and it was problematic to
 721 get it to work at all.  This rewrite doesn't even try to do that, but a
 722 subclass of it does.  Look for L<Pod::Text::Termcap|Pod::Text::Termcap>.
 723
 724 =head1 SEE ALSO
 725
 726 B<Pod::PlainText> is part of the L<Pod::Parser> distribution.
 727
 728 L<Pod::Parser|Pod::Parser>, L<Pod::Text::Termcap|Pod::Text::Termcap>,
 729 pod2text(1)
 730
 731 =head1 AUTHOR
 732
 733 Please report bugs using L<http://rt.cpan.org>.
 734
 735 Russ Allbery E<lt>rra@stanford.eduE<gt>, based I<very> heavily on the
 736 original Pod::Text by Tom Christiansen E<lt>tchrist@mox.perl.comE<gt> and
 737 its conversion to Pod::Parser by Brad Appleton
 738 E<lt>bradapp@enteract.comE<gt>.
 739
 740 =cut