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-# Pod::PlainText -- Convert POD data to formatted ASCII text.
-# $Id: Text.pm,v 2.1 1999/09/20 11:53:33 eagle Exp $
-#
-# Copyright 1999-2000 by Russ Allbery <rra@stanford.edu>
-#
-# This program is free software; you can redistribute it and/or modify it
-# under the same terms as Perl itself.
-#
-# This module is intended to be a replacement for Pod::Text, and attempts to
-# match its output except for some specific circumstances where other
-# decisions seemed to produce better output. It uses Pod::Parser and is
-# designed to be very easy to subclass.
-
-############################################################################
-# Modules and declarations
-############################################################################
-
-package Pod::PlainText;
-
-require 5.005;
-
-use Carp qw(carp croak);
-use Pod::Select ();
-
-use strict;
-use vars qw(@ISA %ESCAPES $VERSION);
-
-# We inherit from Pod::Select instead of Pod::Parser so that we can be used
-# by Pod::Usage.
-@ISA = qw(Pod::Select);
-
-$VERSION = '2.02';
-
-
-############################################################################
-# Table of supported E<> escapes
-############################################################################
-
-# This table is taken near verbatim from Pod::PlainText in Pod::Parser,
-# which got it near verbatim from the original Pod::Text. It is therefore
-# credited to Tom Christiansen, and I'm glad I didn't have to write it. :)
-%ESCAPES = (
- 'amp' => '&', # ampersand
- 'lt' => '<', # left chevron, less-than
- 'gt' => '>', # right chevron, greater-than
- 'quot' => '"', # double quote
-
- "Aacute" => "\xC1", # capital A, acute accent
- "aacute" => "\xE1", # small a, acute accent
- "Acirc" => "\xC2", # capital A, circumflex accent
- "acirc" => "\xE2", # small a, circumflex accent
- "AElig" => "\xC6", # capital AE diphthong (ligature)
- "aelig" => "\xE6", # small ae diphthong (ligature)
- "Agrave" => "\xC0", # capital A, grave accent
- "agrave" => "\xE0", # small a, grave accent
- "Aring" => "\xC5", # capital A, ring
- "aring" => "\xE5", # small a, ring
- "Atilde" => "\xC3", # capital A, tilde
- "atilde" => "\xE3", # small a, tilde
- "Auml" => "\xC4", # capital A, dieresis or umlaut mark
- "auml" => "\xE4", # small a, dieresis or umlaut mark
- "Ccedil" => "\xC7", # capital C, cedilla
- "ccedil" => "\xE7", # small c, cedilla
- "Eacute" => "\xC9", # capital E, acute accent
- "eacute" => "\xE9", # small e, acute accent
- "Ecirc" => "\xCA", # capital E, circumflex accent
- "ecirc" => "\xEA", # small e, circumflex accent
- "Egrave" => "\xC8", # capital E, grave accent
- "egrave" => "\xE8", # small e, grave accent
- "ETH" => "\xD0", # capital Eth, Icelandic
- "eth" => "\xF0", # small eth, Icelandic
- "Euml" => "\xCB", # capital E, dieresis or umlaut mark
- "euml" => "\xEB", # small e, dieresis or umlaut mark
- "Iacute" => "\xCD", # capital I, acute accent
- "iacute" => "\xED", # small i, acute accent
- "Icirc" => "\xCE", # capital I, circumflex accent
- "icirc" => "\xEE", # small i, circumflex accent
- "Igrave" => "\xCD", # capital I, grave accent
- "igrave" => "\xED", # small i, grave accent
- "Iuml" => "\xCF", # capital I, dieresis or umlaut mark
- "iuml" => "\xEF", # small i, dieresis or umlaut mark
- "Ntilde" => "\xD1", # capital N, tilde
- "ntilde" => "\xF1", # small n, tilde
- "Oacute" => "\xD3", # capital O, acute accent
- "oacute" => "\xF3", # small o, acute accent
- "Ocirc" => "\xD4", # capital O, circumflex accent
- "ocirc" => "\xF4", # small o, circumflex accent
- "Ograve" => "\xD2", # capital O, grave accent
- "ograve" => "\xF2", # small o, grave accent
- "Oslash" => "\xD8", # capital O, slash
- "oslash" => "\xF8", # small o, slash
- "Otilde" => "\xD5", # capital O, tilde
- "otilde" => "\xF5", # small o, tilde
- "Ouml" => "\xD6", # capital O, dieresis or umlaut mark
- "ouml" => "\xF6", # small o, dieresis or umlaut mark
- "szlig" => "\xDF", # small sharp s, German (sz ligature)
- "THORN" => "\xDE", # capital THORN, Icelandic
- "thorn" => "\xFE", # small thorn, Icelandic
- "Uacute" => "\xDA", # capital U, acute accent
- "uacute" => "\xFA", # small u, acute accent
- "Ucirc" => "\xDB", # capital U, circumflex accent
- "ucirc" => "\xFB", # small u, circumflex accent
- "Ugrave" => "\xD9", # capital U, grave accent
- "ugrave" => "\xF9", # small u, grave accent
- "Uuml" => "\xDC", # capital U, dieresis or umlaut mark
- "uuml" => "\xFC", # small u, dieresis or umlaut mark
- "Yacute" => "\xDD", # capital Y, acute accent
- "yacute" => "\xFD", # small y, acute accent
- "yuml" => "\xFF", # small y, dieresis or umlaut mark
-
- "lchevron" => "\xAB", # left chevron (double less than)
- "rchevron" => "\xBB", # right chevron (double greater than)
-);
-
-
-############################################################################
-# Initialization
-############################################################################
-
-# Initialize the object. Must be sure to call our parent initializer.
-sub initialize {
- my $self = shift;
-
- $$self{alt} = 0 unless defined $$self{alt};
- $$self{indent} = 4 unless defined $$self{indent};
- $$self{loose} = 0 unless defined $$self{loose};
- $$self{sentence} = 0 unless defined $$self{sentence};
- $$self{width} = 76 unless defined $$self{width};
-
- $$self{INDENTS} = []; # Stack of indentations.
- $$self{MARGIN} = $$self{indent}; # Current left margin in spaces.
-
- $self->SUPER::initialize;
-}
-
-
-############################################################################
-# Core overrides
-############################################################################
-
-# Called for each command paragraph. Gets the command, the associated
-# paragraph, the line number, and a Pod::Paragraph object. Just dispatches
-# the command to a method named the same as the command. =cut is handled
-# internally by Pod::Parser.
-sub command {
- my $self = shift;
- my $command = shift;
- return if $command eq 'pod';
- return if ($$self{EXCLUDE} && $command ne 'end');
- $self->item ("\n") if defined $$self{ITEM};
- $command = 'cmd_' . $command;
- $self->$command (@_);
-}
-
-# Called for a verbatim paragraph. Gets the paragraph, the line number, and
-# a Pod::Paragraph object. Just output it verbatim, but with tabs converted
-# to spaces.
-sub verbatim {
- my $self = shift;
- return if $$self{EXCLUDE};
- $self->item if defined $$self{ITEM};
- local $_ = shift;
- return if /^\s*$/;
- s/^(\s*\S+)/(' ' x $$self{MARGIN}) . $1/gme;
- $self->output ($_);
-}
-
-# Called for a regular text block. Gets the paragraph, the line number, and
-# a Pod::Paragraph object. Perform interpolation and output the results.
-sub textblock {
- my $self = shift;
- return if $$self{EXCLUDE};
- $self->output ($_[0]), return if $$self{VERBATIM};
- local $_ = shift;
- my $line = shift;
-
- # Perform a little magic to collapse multiple L<> references. This is
- # here mostly for backwards-compatibility. We'll just rewrite the whole
- # thing into actual text at this part, bypassing the whole internal
- # sequence parsing thing.
- s{
- (
- L< # A link of the form L</something>.
- /
- (
- [:\w]+ # The item has to be a simple word...
- (\(\))? # ...or simple function.
- )
- >
- (
- ,?\s+(and\s+)? # Allow lots of them, conjuncted.
- L<
- /
- (
- [:\w]+
- (\(\))?
- )
- >
- )+
- )
- } {
- local $_ = $1;
- s%L</([^>]+)>%$1%g;
- my @items = split /(?:,?\s+(?:and\s+)?)/;
- my $string = "the ";
- my $i;
- for ($i = 0; $i < @items; $i++) {
- $string .= $items[$i];
- $string .= ", " if @items > 2 && $i != $#items;
- $string .= " and " if ($i == $#items - 1);
- }
- $string .= " entries elsewhere in this document";
- $string;
- }gex;
-
- # Now actually interpolate and output the paragraph.
- $_ = $self->interpolate ($_, $line);
- s/\s+$/\n/;
- if (defined $$self{ITEM}) {
- $self->item ($_ . "\n");
- } else {
- $self->output ($self->reformat ($_ . "\n"));
- }
-}
-
-# Called for an interior sequence. Gets the command, argument, and a
-# Pod::InteriorSequence object and is expected to return the resulting text.
-# Calls code, bold, italic, file, and link to handle those types of
-# sequences, and handles S<>, E<>, X<>, and Z<> directly.
-sub interior_sequence {
- my $self = shift;
- my $command = shift;
- local $_ = shift;
- return '' if ($command eq 'X' || $command eq 'Z');
-
- # Expand escapes into the actual character now, carping if invalid.
- if ($command eq 'E') {
- return $ESCAPES{$_} if defined $ESCAPES{$_};
- carp "Unknown escape: E<$_>";
- return "E<$_>";
- }
-
- # For all the other sequences, empty content produces no output.
- return if $_ eq '';
-
- # For S<>, compress all internal whitespace and then map spaces to \01.
- # When we output the text, we'll map this back.
- if ($command eq 'S') {
- s/\s{2,}/ /g;
- tr/ /\01/;
- return $_;
- }
-
- # Anything else needs to get dispatched to another method.
- if ($command eq 'B') { return $self->seq_b ($_) }
- elsif ($command eq 'C') { return $self->seq_c ($_) }
- elsif ($command eq 'F') { return $self->seq_f ($_) }
- elsif ($command eq 'I') { return $self->seq_i ($_) }
- elsif ($command eq 'L') { return $self->seq_l ($_) }
- else { carp "Unknown sequence $command<$_>" }
-}
-
-# Called for each paragraph that's actually part of the POD. We take
-# advantage of this opportunity to untabify the input.
-sub preprocess_paragraph {
- my $self = shift;
- local $_ = shift;
- 1 while s/^(.*?)(\t+)/$1 . ' ' x (length ($2) * 8 - length ($1) % 8)/me;
- $_;
-}
-
-
-############################################################################
-# Command paragraphs
-############################################################################
-
-# All command paragraphs take the paragraph and the line number.
-
-# First level heading.
-sub cmd_head1 {
- my $self = shift;
- local $_ = shift;
- s/\s+$//;
- $_ = $self->interpolate ($_, shift);
- if ($$self{alt}) {
- $self->output ("\n==== $_ ====\n\n");
- } else {
- $_ .= "\n" if $$self{loose};
- $self->output ($_ . "\n");
- }
-}
-
-# Second level heading.
-sub cmd_head2 {
- my $self = shift;
- local $_ = shift;
- s/\s+$//;
- $_ = $self->interpolate ($_, shift);
- if ($$self{alt}) {
- $self->output ("\n== $_ ==\n\n");
- } else {
- $self->output (' ' x ($$self{indent} / 2) . $_ . "\n\n");
- }
-}
-
-# Start a list.
-sub cmd_over {
- my $self = shift;
- local $_ = shift;
- unless (/^[-+]?\d+\s+$/) { $_ = $$self{indent} }
- push (@{ $$self{INDENTS} }, $$self{MARGIN});
- $$self{MARGIN} += ($_ + 0);
-}
-
-# End a list.
-sub cmd_back {
- my $self = shift;
- $$self{MARGIN} = pop @{ $$self{INDENTS} };
- unless (defined $$self{MARGIN}) {
- carp "Unmatched =back";
- $$self{MARGIN} = $$self{indent};
- }
-}
-
-# An individual list item.
-sub cmd_item {
- my $self = shift;
- if (defined $$self{ITEM}) { $self->item }
- local $_ = shift;
- s/\s+$//;
- $$self{ITEM} = $self->interpolate ($_);
-}
-
-# Begin a block for a particular translator. Setting VERBATIM triggers
-# special handling in textblock().
-sub cmd_begin {
- my $self = shift;
- local $_ = shift;
- my ($kind) = /^(\S+)/ or return;
- if ($kind eq 'text') {
- $$self{VERBATIM} = 1;
- } else {
- $$self{EXCLUDE} = 1;
- }
-}
-
-# End a block for a particular translator. We assume that all =begin/=end
-# pairs are properly closed.
-sub cmd_end {
- my $self = shift;
- $$self{EXCLUDE} = 0;
- $$self{VERBATIM} = 0;
-}
-
-# One paragraph for a particular translator. Ignore it unless it's intended
-# for text, in which case we treat it as a verbatim text block.
-sub cmd_for {
- my $self = shift;
- local $_ = shift;
- my $line = shift;
- return unless s/^text\b[ \t]*\n?//;
- $self->verbatim ($_, $line);
-}
-
-
-############################################################################
-# Interior sequences
-############################################################################
-
-# The simple formatting ones. These are here mostly so that subclasses can
-# override them and do more complicated things.
-sub seq_b { return $_[0]{alt} ? "``$_[1]''" : $_[1] }
-sub seq_c { return $_[0]{alt} ? "``$_[1]''" : "`$_[1]'" }
-sub seq_f { return $_[0]{alt} ? "\"$_[1]\"" : $_[1] }
-sub seq_i { return '*' . $_[1] . '*' }
-
-# The complicated one. Handle links. Since this is plain text, we can't
-# actually make any real links, so this is all to figure out what text we
-# print out.
-sub seq_l {
- my $self = shift;
- local $_ = shift;
-
- # Smash whitespace in case we were split across multiple lines.
- s/\s+/ /g;
-
- # If we were given any explicit text, just output it.
- if (/^([^|]+)\|/) { return $1 }
-
- # Okay, leading and trailing whitespace isn't important; get rid of it.
- s/^\s+//;
- s/\s+$//;
-
- # Default to using the whole content of the link entry as a section
- # name. Note that L<manpage/> forces a manpage interpretation, as does
- # something looking like L<manpage(section)>. The latter is an
- # enhancement over the original Pod::Text.
- my ($manpage, $section) = ('', $_);
- if (/^(?:https?|ftp|news):/) {
- # a URL
- return $_;
- } elsif (/^"\s*(.*?)\s*"$/) {
- $section = '"' . $1 . '"';
- } elsif (m/^[-:.\w]+(?:\(\S+\))?$/) {
- ($manpage, $section) = ($_, '');
- } elsif (m%/%) {
- ($manpage, $section) = split (/\s*\/\s*/, $_, 2);
- }
-
- my $text = '';
- # Now build the actual output text.
- if (!length $section) {
- $text = "the $manpage manpage" if length $manpage;
- } elsif ($section =~ /^[:\w]+(?:\(\))?/) {
- $text .= 'the ' . $section . ' entry';
- $text .= (length $manpage) ? " in the $manpage manpage"
- : " elsewhere in this document";
- } else {
- $section =~ s/^\"\s*//;
- $section =~ s/\s*\"$//;
- $text .= 'the section on "' . $section . '"';
- $text .= " in the $manpage manpage" if length $manpage;
- }
- $text;
-}
-
-
-############################################################################
-# List handling
-############################################################################
-
-# This method is called whenever an =item command is complete (in other
-# words, we've seen its associated paragraph or know for certain that it
-# doesn't have one). It gets the paragraph associated with the item as an
-# argument. If that argument is empty, just output the item tag; if it
-# contains a newline, output the item tag followed by the newline.
-# Otherwise, see if there's enough room for us to output the item tag in the
-# margin of the text or if we have to put it on a separate line.
-sub item {
- my $self = shift;
- local $_ = shift;
- my $tag = $$self{ITEM};
- unless (defined $tag) {
- carp "item called without tag";
- return;
- }
- undef $$self{ITEM};
- my $indent = $$self{INDENTS}[-1];
- unless (defined $indent) { $indent = $$self{indent} }
- my $space = ' ' x $indent;
- $space =~ s/^ /:/ if $$self{alt};
- if (!$_ || /^\s+$/ || ($$self{MARGIN} - $indent < length ($tag) + 1)) {
- my $margin = $$self{MARGIN};
- $$self{MARGIN} = $indent;
- my $output = $self->reformat ($tag);
- $output =~ s/\n*$/\n/;
- $self->output ($output);
- $$self{MARGIN} = $margin;
- $self->output ($self->reformat ($_)) if /\S/;
- } else {
- $_ = $self->reformat ($_);
- s/^ /:/ if ($$self{alt} && $indent > 0);
- my $tagspace = ' ' x length $tag;
- s/^($space)$tagspace/$1$tag/ or warn "Bizarre space in item";
- $self->output ($_);
- }
-}
-
-
-############################################################################
-# Output formatting
-############################################################################
-
-# Wrap a line, indenting by the current left margin. We can't use
-# Text::Wrap because it plays games with tabs. We can't use formline, even
-# though we'd really like to, because it screws up non-printing characters.
-# So we have to do the wrapping ourselves.
-sub wrap {
- my $self = shift;
- local $_ = shift;
- my $output = '';
- my $spaces = ' ' x $$self{MARGIN};
- my $width = $$self{width} - $$self{MARGIN};
- while (length > $width) {
- if (s/^([^\n]{0,$width})\s+// || s/^([^\n]{$width})//) {
- $output .= $spaces . $1 . "\n";
- } else {
- last;
- }
- }
- $output .= $spaces . $_;
- $output =~ s/\s+$/\n\n/;
- $output;
-}
-
-# Reformat a paragraph of text for the current margin. Takes the text to
-# reformat and returns the formatted text.
-sub reformat {
- my $self = shift;
- local $_ = shift;
-
- # If we're trying to preserve two spaces after sentences, do some
- # munging to support that. Otherwise, smash all repeated whitespace.
- if ($$self{sentence}) {
- s/ +$//mg;
- s/\.\n/. \n/g;
- s/\n/ /g;
- s/ +/ /g;
- } else {
- s/\s+/ /g;
- }
- $self->wrap ($_);
-}
-
-# Output text to the output device.
-sub output { $_[1] =~ tr/\01/ /; print { $_[0]->output_handle } $_[1] }
-
-
-############################################################################
-# Backwards compatibility
-############################################################################
-
-# The old Pod::Text module did everything in a pod2text() function. This
-# tries to provide the same interface for legacy applications.
-sub pod2text {
- my @args;
-
- # This is really ugly; I hate doing option parsing in the middle of a
- # module. But the old Pod::Text module supported passing flags to its
- # entry function, so handle -a and -<number>.
- while ($_[0] =~ /^-/) {
- my $flag = shift;
- if ($flag eq '-a') { push (@args, alt => 1) }
- elsif ($flag =~ /^-(\d+)$/) { push (@args, width => $1) }
- else {
- unshift (@_, $flag);
- last;
- }
- }
-
- # Now that we know what arguments we're using, create the parser.
- my $parser = Pod::PlainText->new (@args);
-
- # If two arguments were given, the second argument is going to be a file
- # handle. That means we want to call parse_from_filehandle(), which
- # means we need to turn the first argument into a file handle. Magic
- # open will handle the <&STDIN case automagically.
- if (defined $_[1]) {
- local *IN;
- unless (open (IN, $_[0])) {
- croak ("Can't open $_[0] for reading: $!\n");
- return;
- }
- $_[0] = \*IN;
- return $parser->parse_from_filehandle (@_);
- } else {
- return $parser->parse_from_file (@_);
- }
-}
-
-
-############################################################################
-# Module return value and documentation
-############################################################################
-
-1;
-__END__
-
-=head1 NAME
-
-Pod::PlainText - Convert POD data to formatted ASCII text
-
-=head1 SYNOPSIS
-
- use Pod::PlainText;
- my $parser = Pod::PlainText->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::PlainText is a module that can convert documentation in the POD format (the
-preferred language for documenting Perl) into formatted ASCII. It uses no
-special formatting controls or codes whatsoever, and its output is therefore
-suitable for nearly any device.
-
-As a derived class from Pod::Parser, Pod::PlainText supports the same methods and
-interfaces. See L<Pod::Parser> for all the details; briefly, one creates a
-new parser with C<Pod::PlainText-E<gt>new()> and then calls either
-parse_from_filehandle() or parse_from_file().
-
-new() can take options, in the form of key/value pairs, that control the
-behavior of the parser. The currently recognized options are:
-
-=over 4
-
-=item alt
-
-If set to a true value, selects an alternate output format that, among other
-things, uses a different heading style and marks C<=item> entries with a
-colon in the left margin. Defaults to false.
-
-=item indent
-
-The number of spaces to indent regular text, and the default indentation for
-C<=over> blocks. Defaults to 4.
-
-=item loose
-
-If set to a true value, a blank line is printed after a C<=head1> heading.
-If set to false (the default), no blank line is printed after C<=head1>,
-although one is still printed after C<=head2>. This is the default because
-it's the expected formatting for manual pages; if you're formatting
-arbitrary text documents, setting this to true may result in more pleasing
-output.
-
-=item sentence
-
-If set to a true value, Pod::PlainText will assume that each sentence ends in two
-spaces, and will try to preserve that spacing. If set to false, all
-consecutive whitespace in non-verbatim paragraphs is compressed into a
-single space. Defaults to true.
-
-=item width
-
-The column at which to wrap text on the right-hand side. Defaults to 76.
-
-=back
-
-The standard Pod::Parser method parse_from_filehandle() takes up to two
-arguments, the first being the file handle to read POD from and the second
-being the file handle to write the formatted output to. The first defaults
-to STDIN if not given, and the second defaults to STDOUT. The method
-parse_from_file() is almost identical, except that its two arguments are the
-input and output disk files instead. See L<Pod::Parser> for the specific
-details.
-
-=head1 DIAGNOSTICS
-
-=over 4
-
-=item Bizarre space in item
-
-(W) Something has gone wrong in internal C<=item> processing. This message
-indicates a bug in Pod::PlainText; you should never see it.
-
-=item Can't open %s for reading: %s
-
-(F) Pod::PlainText was invoked via the compatibility mode pod2text() interface
-and the input file it was given could not be opened.
-
-=item Unknown escape: %s
-
-(W) The POD source contained an C<EE<lt>E<gt>> escape that Pod::PlainText didn't
-know about.
-
-=item Unknown sequence: %s
-
-(W) The POD source contained a non-standard internal sequence (something of
-the form C<XE<lt>E<gt>>) that Pod::PlainText didn't know about.
-
-=item Unmatched =back
-
-(W) Pod::PlainText encountered a C<=back> command that didn't correspond to an
-C<=over> command.
-
-=back
-
-=head1 RESTRICTIONS
-
-Embedded Ctrl-As (octal 001) in the input will be mapped to spaces on
-output, due to an internal implementation detail.
-
-=head1 NOTES
-
-This is a replacement for an earlier Pod::Text module written by Tom
-Christiansen. It has a revamped interface, since it now uses Pod::Parser,
-but an interface roughly compatible with the old Pod::Text::pod2text()
-function is still available. Please change to the new calling convention,
-though.
-
-The original Pod::Text contained code to do formatting via termcap
-sequences, although it wasn't turned on by default and it was problematic to
-get it to work at all. This rewrite doesn't even try to do that, but a
-subclass of it does. Look for L<Pod::Text::Termcap|Pod::Text::Termcap>.
-
-=head1 SEE ALSO
-
-L<Pod::Parser|Pod::Parser>, L<Pod::Text::Termcap|Pod::Text::Termcap>,
-pod2text(1)
-
-=head1 AUTHOR
-
-Please report bugs using L<http://rt.cpan.org>.
-
-Russ Allbery E<lt>rra@stanford.eduE<gt>, based I<very> heavily on the
-original Pod::Text by Tom Christiansen E<lt>tchrist@mox.perl.comE<gt> and
-its conversion to Pod::Parser by Brad Appleton
-E<lt>bradapp@enteract.comE<gt>.
-
-=cut