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package Pod::Simple::BlackBox;
#
# "What's in the box?" "Pain."
#
###########################################################################
#
# This is where all the scary things happen: parsing lines into
# paragraphs; and then into directives, verbatims, and then also
# turning formatting sequences into treelets.
#
# Are you really sure you want to read this code?
#
#-----------------------------------------------------------------------------
#
# The basic work of this module Pod::Simple::BlackBox is doing the dirty work
# of parsing Pod into treelets (generally one per non-verbatim paragraph), and
# to call the proper callbacks on the treelets.
#
# Every node in a treelet is a ['name', {attrhash}, ...children...]
use integer; # vroom!
use strict;
use Carp ();
use vars qw($VERSION );
$VERSION = '3.35';
#use constant DEBUG => 7;
BEGIN {
require Pod::Simple;
*DEBUG = \&Pod::Simple::DEBUG unless defined &DEBUG
}
# Matches a character iff the character will have a different meaning
# if we choose CP1252 vs UTF-8 if there is no =encoding line.
# This is broken for early Perls on non-ASCII platforms.
my $non_ascii_re = eval "qr/[[:^ascii:]]/";
$non_ascii_re = qr/[\x80-\xFF]/ if ! defined $non_ascii_re;
my $utf8_bom;
if (($] ge 5.007_003)) {
$utf8_bom = "\x{FEFF}";
utf8::encode($utf8_bom);
} else {
$utf8_bom = "\xEF\xBB\xBF"; # No EBCDIC BOM detection for early Perls.
}
#@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
sub parse_line { shift->parse_lines(@_) } # alias
# - - - Turn back now! Run away! - - -
sub parse_lines { # Usage: $parser->parse_lines(@lines)
# an undef means end-of-stream
my $self = shift;
my $code_handler = $self->{'code_handler'};
my $cut_handler = $self->{'cut_handler'};
my $wl_handler = $self->{'whiteline_handler'};
$self->{'line_count'} ||= 0;
my $scratch;
DEBUG > 4 and
print STDERR "# Parsing starting at line ", $self->{'line_count'}, ".\n";
DEBUG > 5 and
print STDERR "# About to parse lines: ",
join(' ', map defined($_) ? "[$_]" : "EOF", @_), "\n";
my $paras = ($self->{'paras'} ||= []);
# paragraph buffer. Because we need to defer processing of =over
# directives and verbatim paragraphs. We call _ponder_paragraph_buffer
# to process this.
$self->{'pod_para_count'} ||= 0;
my $line;
foreach my $source_line (@_) {
if( $self->{'source_dead'} ) {
DEBUG > 4 and print STDERR "# Source is dead.\n";
last;
}
unless( defined $source_line ) {
DEBUG > 4 and print STDERR "# Undef-line seen.\n";
push @$paras, ['~end', {'start_line' => $self->{'line_count'}}];
push @$paras, $paras->[-1], $paras->[-1];
# So that it definitely fills the buffer.
$self->{'source_dead'} = 1;
$self->_ponder_paragraph_buffer;
next;
}
if( $self->{'line_count'}++ ) {
($line = $source_line) =~ tr/\n\r//d;
# If we don't have two vars, we'll end up with that there
# tr/// modding the (potentially read-only) original source line!
} else {
DEBUG > 2 and print STDERR "First line: [$source_line]\n";
if( ($line = $source_line) =~ s/^$utf8_bom//s ) {
DEBUG and print STDERR "UTF-8 BOM seen. Faking a '=encoding utf8'.\n";
$self->_handle_encoding_line( "=encoding utf8" );
delete $self->{'_processed_encoding'};
$line =~ tr/\n\r//d;
} elsif( $line =~ s/^\xFE\xFF//s ) {
DEBUG and print STDERR "Big-endian UTF-16 BOM seen. Aborting parsing.\n";
$self->scream(
$self->{'line_count'},
"UTF16-BE Byte Encoding Mark found; but Pod::Simple v$Pod::Simple::VERSION doesn't implement UTF16 yet."
);
splice @_;
push @_, undef;
next;
# TODO: implement somehow?
} elsif( $line =~ s/^\xFF\xFE//s ) {
DEBUG and print STDERR "Little-endian UTF-16 BOM seen. Aborting parsing.\n";
$self->scream(
$self->{'line_count'},
"UTF16-LE Byte Encoding Mark found; but Pod::Simple v$Pod::Simple::VERSION doesn't implement UTF16 yet."
);
splice @_;
push @_, undef;
next;
# TODO: implement somehow?
} else {
DEBUG > 2 and print STDERR "First line is BOM-less.\n";
($line = $source_line) =~ tr/\n\r//d;
}
}
if(!$self->{'parse_characters'} && !$self->{'encoding'}
&& ($self->{'in_pod'} || $line =~ /^=/s)
&& $line =~ /$non_ascii_re/
) {
my $encoding;
# No =encoding line, and we are at the first line in the input that
# contains a non-ascii byte, that is one whose meaning varies depending
# on whether the file is encoded in UTF-8 or CP1252, which are the two
# possibilities permitted by the pod spec. (ASCII is assumed if the
# file only contains ASCII bytes.) In order to process this line, we
# need to figure out what encoding we will use for the file.
#
# Strictly speaking ISO 8859-1 (Latin 1) refers to the code points
# 160-255, but it is used here, as it often colloquially is, to refer to
# the complete set of code points 0-255, including ASCII (0-127), the C1
# controls (128-159), and strict Latin 1 (160-255).
#
# CP1252 is effectively a superset of Latin 1, because it differs only
# from colloquial 8859-1 in the C1 controls, which are very unlikely to
# actually be present in 8859-1 files, so can be used for other purposes
# without conflict. CP 1252 uses most of them for graphic characters.
#
# Note that all ASCII-range bytes represent their corresponding code
# points in CP1252 and UTF-8. In ASCII platform UTF-8 all other code
# points require multiple (non-ASCII) bytes to represent. (A separate
# paragraph for EBCDIC is below.) The multi-byte representation is
# quite structured. If we find an isolated byte that requires multiple
# bytes to represent in UTF-8, we know that the encoding is not UTF-8.
# If we find a sequence of bytes that violates the UTF-8 structure, we
# also can presume the encoding isn't UTF-8, and hence must be 1252.
#
# But there are ambiguous cases where we could guess wrong. If so, the
# user will end up having to supply an =encoding line. We use all
# readily available information to improve our chances of guessing
# right. The odds of something not being UTF-8, but still passing a
# UTF-8 validity test go down very rapidly with increasing length of the
# sequence. Therefore we look at all the maximal length non-ascii
# sequences on the line. If any of the sequences can't be UTF-8, we
# quit there and choose CP1252. If all could be UTF-8, we guess UTF-8.
#
# On EBCDIC platforms, the situation is somewhat different. In
# UTF-EBCDIC, not only do ASCII-range bytes represent their code points,
# but so do the bytes that are for the C1 controls. Recall that these
# correspond to the unused portion of 8859-1 that 1252 mostly takes
# over. That means that there are fewer code points that are
# represented by multi-bytes. But, note that the these controls are
# very unlikely to be in pod text. So if we encounter one of them, it
# means that it is quite likely CP1252 and not UTF-8. The net result is
# the same code below is used for both platforms.
while ($line =~ m/($non_ascii_re+)/g) {
my $non_ascii_seq = $1;
if (length $non_ascii_seq == 1) {
$encoding = 'CP1252';
goto guessed;
} elsif ($] ge 5.007_003) {
# On Perls that have this function, we can see if the sequence is
# valid UTF-8 or not.
my $is_utf8;
{
no warnings 'utf8';
$is_utf8 = utf8::decode($non_ascii_seq);
}
if (! $is_utf8) {
$encoding = 'CP1252';
goto guessed;
}
} elsif (ord("A") == 65) { # An early Perl, ASCII platform
# Without utf8::decode, it's a lot harder to do a rigorous check
# (though some early releases had a different function that
# accomplished the same thing). Since these are ancient Perls, not
# likely to be in use today, we take the easy way out, and look at
# just the first two bytes of the sequence to see if they are the
# start of a UTF-8 character. In ASCII UTF-8, continuation bytes
# must be between 0x80 and 0xBF. Start bytes can range from 0xC2
# through 0xFF, but anything above 0xF4 is not Unicode, and hence
# extremely unlikely to be in a pod.
if ($non_ascii_seq !~ /^[\xC2-\xF4][\x80-\xBF]/) {
$encoding = 'CP1252';
goto guessed;
}
# We don't bother doing anything special for EBCDIC on early Perls.
# If there is a solitary variant, CP1252 will be chosen; otherwise
# UTF-8.
}
} # End of loop through all variant sequences on the line
# All sequences in the line could be UTF-8. Guess that.
$encoding = 'UTF-8';
guessed:
$self->_handle_encoding_line( "=encoding $encoding" );
delete $self->{'_processed_encoding'};
$self->{'_transcoder'} && $self->{'_transcoder'}->($line);
my ($word) = $line =~ /(\S*$non_ascii_re\S*)/;
$self->whine(
$self->{'line_count'},
"Non-ASCII character seen before =encoding in '$word'. Assuming $encoding"
);
}
DEBUG > 5 and print STDERR "# Parsing line: [$line]\n";
if(!$self->{'in_pod'}) {
if($line =~ m/^=([a-zA-Z][a-zA-Z0-9]*)(?:\s|$)/s) {
if($1 eq 'cut') {
$self->scream(
$self->{'line_count'},
"=cut found outside a pod block. Skipping to next block."
);
## Before there were errata sections in the world, it was
## least-pessimal to abort processing the file. But now we can
## just barrel on thru (but still not start a pod block).
#splice @_;
#push @_, undef;
next;
} else {
$self->{'in_pod'} = $self->{'start_of_pod_block'}
= $self->{'last_was_blank'} = 1;
# And fall thru to the pod-mode block further down
}
} else {
DEBUG > 5 and print STDERR "# It's a code-line.\n";
$code_handler->(map $_, $line, $self->{'line_count'}, $self)
if $code_handler;
# Note: this may cause code to be processed out of order relative
# to pods, but in order relative to cuts.
# Note also that we haven't yet applied the transcoding to $line
# by time we call $code_handler!
if( $line =~ m/^#\s*line\s+(\d+)\s*(?:\s"([^"]+)")?\s*$/ ) {
# That RE is from perlsyn, section "Plain Old Comments (Not!)",
#$fname = $2 if defined $2;
#DEBUG > 1 and defined $2 and print STDERR "# Setting fname to \"$fname\"\n";
DEBUG > 1 and print STDERR "# Setting nextline to $1\n";
$self->{'line_count'} = $1 - 1;
}
next;
}
}
# . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
# Else we're in pod mode:
# Apply any necessary transcoding:
$self->{'_transcoder'} && $self->{'_transcoder'}->($line);
# HERE WE CATCH =encoding EARLY!
if( $line =~ m/^=encoding\s+\S+\s*$/s ) {
next if $self->parse_characters; # Ignore this line
$line = $self->_handle_encoding_line( $line );
}
if($line =~ m/^=cut/s) {
# here ends the pod block, and therefore the previous pod para
DEBUG > 1 and print STDERR "Noting =cut at line ${$self}{'line_count'}\n";
$self->{'in_pod'} = 0;
# ++$self->{'pod_para_count'};
$self->_ponder_paragraph_buffer();
# by now it's safe to consider the previous paragraph as done.
$cut_handler->(map $_, $line, $self->{'line_count'}, $self)
if $cut_handler;
# TODO: add to docs: Note: this may cause cuts to be processed out
# of order relative to pods, but in order relative to code.
} elsif($line =~ m/^(\s*)$/s) { # it's a blank line
if (defined $1 and $1 =~ /[^\S\r\n]/) { # it's a white line
$wl_handler->(map $_, $line, $self->{'line_count'}, $self)
if $wl_handler;
}
if(!$self->{'start_of_pod_block'} and @$paras and $paras->[-1][0] eq '~Verbatim') {
DEBUG > 1 and print STDERR "Saving blank line at line ${$self}{'line_count'}\n";
push @{$paras->[-1]}, $line;
} # otherwise it's not interesting
if(!$self->{'start_of_pod_block'} and !$self->{'last_was_blank'}) {
DEBUG > 1 and print STDERR "Noting para ends with blank line at ${$self}{'line_count'}\n";
}
$self->{'last_was_blank'} = 1;
} elsif($self->{'last_was_blank'}) { # A non-blank line starting a new para...
if($line =~ m/^(=[a-zA-Z][a-zA-Z0-9]*)(?:\s+|$)(.*)/s) {
# THIS IS THE ONE PLACE WHERE WE CONSTRUCT NEW DIRECTIVE OBJECTS
my $new = [$1, {'start_line' => $self->{'line_count'}}, $2];
# Note that in "=head1 foo", the WS is lost.
# Example: ['=head1', {'start_line' => 123}, ' foo']
++$self->{'pod_para_count'};
$self->_ponder_paragraph_buffer();
# by now it's safe to consider the previous paragraph as done.
push @$paras, $new; # the new incipient paragraph
DEBUG > 1 and print STDERR "Starting new ${$paras}[-1][0] para at line ${$self}{'line_count'}\n";
} elsif($line =~ m/^\s/s) {
if(!$self->{'start_of_pod_block'} and @$paras and $paras->[-1][0] eq '~Verbatim') {
DEBUG > 1 and print STDERR "Resuming verbatim para at line ${$self}{'line_count'}\n";
push @{$paras->[-1]}, $line;
} else {
++$self->{'pod_para_count'};
$self->_ponder_paragraph_buffer();
# by now it's safe to consider the previous paragraph as done.
DEBUG > 1 and print STDERR "Starting verbatim para at line ${$self}{'line_count'}\n";
push @$paras, ['~Verbatim', {'start_line' => $self->{'line_count'}}, $line];
}
} else {
++$self->{'pod_para_count'};
$self->_ponder_paragraph_buffer();
# by now it's safe to consider the previous paragraph as done.
push @$paras, ['~Para', {'start_line' => $self->{'line_count'}}, $line];
DEBUG > 1 and print STDERR "Starting plain para at line ${$self}{'line_count'}\n";
}
$self->{'last_was_blank'} = $self->{'start_of_pod_block'} = 0;
} else {
# It's a non-blank line /continuing/ the current para
if(@$paras) {
DEBUG > 2 and print STDERR "Line ${$self}{'line_count'} continues current paragraph\n";
push @{$paras->[-1]}, $line;
} else {
# Unexpected case!
die "Continuing a paragraph but \@\$paras is empty?";
}
$self->{'last_was_blank'} = $self->{'start_of_pod_block'} = 0;
}
} # ends the big while loop
DEBUG > 1 and print STDERR (pretty(@$paras), "\n");
return $self;
}
#@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
sub _handle_encoding_line {
my($self, $line) = @_;
return if $self->parse_characters;
# The point of this routine is to set $self->{'_transcoder'} as indicated.
return $line unless $line =~ m/^=encoding\s+(\S+)\s*$/s;
DEBUG > 1 and print STDERR "Found an encoding line \"=encoding $1\"\n";
my $e = $1;
my $orig = $e;
push @{ $self->{'encoding_command_reqs'} }, "=encoding $orig";
my $enc_error;
# Cf. perldoc Encode and perldoc Encode::Supported
require Pod::Simple::Transcode;
if( $self->{'encoding'} ) {
my $norm_current = $self->{'encoding'};
my $norm_e = $e;
foreach my $that ($norm_current, $norm_e) {
$that = lc($that);
$that =~ s/[-_]//g;
}
if($norm_current eq $norm_e) {
DEBUG > 1 and print STDERR "The '=encoding $orig' line is ",
"redundant. ($norm_current eq $norm_e). Ignoring.\n";
$enc_error = '';
# But that doesn't necessarily mean that the earlier one went okay
} else {
$enc_error = "Encoding is already set to " . $self->{'encoding'};
DEBUG > 1 and print STDERR $enc_error;
}
} elsif (
# OK, let's turn on the encoding
do {
DEBUG > 1 and print STDERR " Setting encoding to $e\n";
$self->{'encoding'} = $e;
1;
}
and $e eq 'HACKRAW'
) {
DEBUG and print STDERR " Putting in HACKRAW (no-op) encoding mode.\n";
} elsif( Pod::Simple::Transcode::->encoding_is_available($e) ) {
die($enc_error = "WHAT? _transcoder is already set?!")
if $self->{'_transcoder'}; # should never happen
require Pod::Simple::Transcode;
$self->{'_transcoder'} = Pod::Simple::Transcode::->make_transcoder($e);
eval {
my @x = ('', "abc", "123");
$self->{'_transcoder'}->(@x);
};
$@ && die( $enc_error =
"Really unexpected error setting up encoding $e: $@\nAborting"
);
$self->{'detected_encoding'} = $e;
} else {
my @supported = Pod::Simple::Transcode::->all_encodings;
# Note unsupported, and complain
DEBUG and print STDERR " Encoding [$e] is unsupported.",
"\nSupporteds: @supported\n";
my $suggestion = '';
# Look for a near match:
my $norm = lc($e);
$norm =~ tr[-_][]d;
my $n;
foreach my $enc (@supported) {
$n = lc($enc);
$n =~ tr[-_][]d;
next unless $n eq $norm;
$suggestion = " (Maybe \"$e\" should be \"$enc\"?)";
last;
}
my $encmodver = Pod::Simple::Transcode::->encmodver;
$enc_error = join '' =>
"This document probably does not appear as it should, because its ",
"\"=encoding $e\" line calls for an unsupported encoding.",
$suggestion, " [$encmodver\'s supported encodings are: @supported]"
;
$self->scream( $self->{'line_count'}, $enc_error );
}
push @{ $self->{'encoding_command_statuses'} }, $enc_error;
if (defined($self->{'_processed_encoding'})) {
# Double declaration.
$self->scream( $self->{'line_count'}, 'Cannot have multiple =encoding directives');
}
$self->{'_processed_encoding'} = $orig;
return $line;
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
sub _handle_encoding_second_level {
# By time this is called, the encoding (if well formed) will already
# have been acted one.
my($self, $para) = @_;
my @x = @$para;
my $content = join ' ', splice @x, 2;
$content =~ s/^\s+//s;
$content =~ s/\s+$//s;
DEBUG > 2 and print STDERR "Ogling encoding directive: =encoding $content\n";
if (defined($self->{'_processed_encoding'})) {
#if($content ne $self->{'_processed_encoding'}) {
# Could it happen?
#}
delete $self->{'_processed_encoding'};
# It's already been handled. Check for errors.
if(! $self->{'encoding_command_statuses'} ) {
DEBUG > 2 and print STDERR " CRAZY ERROR: It wasn't really handled?!\n";
} elsif( $self->{'encoding_command_statuses'}[-1] ) {
$self->whine( $para->[1]{'start_line'},
sprintf "Couldn't do %s: %s",
$self->{'encoding_command_reqs' }[-1],
$self->{'encoding_command_statuses'}[-1],
);
} else {
DEBUG > 2 and print STDERR " (Yup, it was successfully handled already.)\n";
}
} else {
# Otherwise it's a syntax error
$self->whine( $para->[1]{'start_line'},
"Invalid =encoding syntax: $content"
);
}
return;
}
#~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`
{
my $m = -321; # magic line number
sub _gen_errata {
my $self = $_[0];
# Return 0 or more fake-o paragraphs explaining the accumulated
# errors on this document.
return() unless $self->{'errata'} and keys %{$self->{'errata'}};
my @out;
foreach my $line (sort {$a <=> $b} keys %{$self->{'errata'}}) {
push @out,
['=item', {'start_line' => $m}, "Around line $line:"],
map( ['~Para', {'start_line' => $m, '~cooked' => 1},
#['~Top', {'start_line' => $m},
$_
#]
],
@{$self->{'errata'}{$line}}
)
;
}
# TODO: report of unknown entities? unrenderable characters?
unshift @out,
['=head1', {'start_line' => $m, 'errata' => 1}, 'POD ERRORS'],
['~Para', {'start_line' => $m, '~cooked' => 1, 'errata' => 1},
"Hey! ",
['B', {},
'The above document had some coding errors, which are explained below:'
]
],
['=over', {'start_line' => $m, 'errata' => 1}, ''],
;
push @out,
['=back', {'start_line' => $m, 'errata' => 1}, ''],
;
DEBUG and print STDERR "\n<<\n", pretty(\@out), "\n>>\n\n";
return @out;
}
}
#@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
##############################################################################
##
## stop reading now stop reading now stop reading now stop reading now stop
##
## HERE IT BECOMES REALLY SCARY
##
## stop reading now stop reading now stop reading now stop reading now stop
##
##############################################################################
sub _ponder_paragraph_buffer {
# Para-token types as found in the buffer.
# ~Verbatim, ~Para, ~end, =head1..4, =for, =begin, =end,
# =over, =back, =item
# and the null =pod (to be complained about if over one line)
#
# "~data" paragraphs are something we generate at this level, depending on
# a currently open =over region
# Events fired: Begin and end for:
# directivename (like head1 .. head4), item, extend,
# for (from =begin...=end, =for),
# over-bullet, over-number, over-text, over-block,
# item-bullet, item-number, item-text,
# Document,
# Data, Para, Verbatim
# B, C, longdirname (TODO -- wha?), etc. for all directives
#
my $self = $_[0];
my $paras;
return unless @{$paras = $self->{'paras'}};
my $curr_open = ($self->{'curr_open'} ||= []);
my $scratch;
DEBUG > 10 and print STDERR "# Paragraph buffer: <<", pretty($paras), ">>\n";
# We have something in our buffer. So apparently the document has started.
unless($self->{'doc_has_started'}) {
$self->{'doc_has_started'} = 1;
my $starting_contentless;
$starting_contentless =
(
!@$curr_open
and @$paras and ! grep $_->[0] ne '~end', @$paras
# i.e., if the paras is all ~ends
)
;
DEBUG and print STDERR "# Starting ",
$starting_contentless ? 'contentless' : 'contentful',
" document\n"
;
$self->_handle_element_start(
($scratch = 'Document'),
{
'start_line' => $paras->[0][1]{'start_line'},
$starting_contentless ? ( 'contentless' => 1 ) : (),
},
);
}
my($para, $para_type);
while(@$paras) {
last if @$paras == 1 and
( $paras->[0][0] eq '=over' or $paras->[0][0] eq '~Verbatim'
or $paras->[0][0] eq '=item' )
;
# Those're the three kinds of paragraphs that require lookahead.
# Actually, an "=item Foo" inside an <over type=text> region
# and any =item inside an <over type=block> region (rare)
# don't require any lookahead, but all others (bullets
# and numbers) do.
# TODO: whinge about many kinds of directives in non-resolving =for regions?
# TODO: many? like what? =head1 etc?
$para = shift @$paras;
$para_type = $para->[0];
DEBUG > 1 and print STDERR "Pondering a $para_type paragraph, given the stack: (",
$self->_dump_curr_open(), ")\n";
if($para_type eq '=for') {
next if $self->_ponder_for($para,$curr_open,$paras);
} elsif($para_type eq '=begin') {
next if $self->_ponder_begin($para,$curr_open,$paras);
} elsif($para_type eq '=end') {
next if $self->_ponder_end($para,$curr_open,$paras);
} elsif($para_type eq '~end') { # The virtual end-document signal
next if $self->_ponder_doc_end($para,$curr_open,$paras);
}
# ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
#~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
if(grep $_->[1]{'~ignore'}, @$curr_open) {
DEBUG > 1 and
print STDERR "Skipping $para_type paragraph because in ignore mode.\n";
next;
}
#~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
# ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
if($para_type eq '=pod') {
$self->_ponder_pod($para,$curr_open,$paras);
} elsif($para_type eq '=over') {
next if $self->_ponder_over($para,$curr_open,$paras);
} elsif($para_type eq '=back') {
next if $self->_ponder_back($para,$curr_open,$paras);
} else {
# All non-magical codes!!!
# Here we start using $para_type for our own twisted purposes, to
# mean how it should get treated, not as what the element name
# should be.
DEBUG > 1 and print STDERR "Pondering non-magical $para_type\n";
my $i;
# Enforce some =headN discipline
if($para_type =~ m/^=head\d$/s
and ! $self->{'accept_heads_anywhere'}
and @$curr_open
and $curr_open->[-1][0] eq '=over'
) {
DEBUG > 2 and print STDERR "'=$para_type' inside an '=over'!\n";
$self->whine(
$para->[1]{'start_line'},
"You forgot a '=back' before '$para_type'"
);
unshift @$paras, ['=back', {}, ''], $para; # close the =over
next;
}
if($para_type eq '=item') {
my $over;
unless(@$curr_open and
$over = (grep { $_->[0] eq '=over' } @$curr_open)[-1]) {
$self->whine(
$para->[1]{'start_line'},
"'=item' outside of any '=over'"
);
unshift @$paras,
['=over', {'start_line' => $para->[1]{'start_line'}}, ''],
$para
;
next;
}
my $over_type = $over->[1]{'~type'};
if(!$over_type) {
# Shouldn't happen1
die "Typeless over in stack, starting at line "
. $over->[1]{'start_line'};
} elsif($over_type eq 'block') {
unless($curr_open->[-1][1]{'~bitched_about'}) {
$curr_open->[-1][1]{'~bitched_about'} = 1;
$self->whine(
$curr_open->[-1][1]{'start_line'},
"You can't have =items (as at line "
. $para->[1]{'start_line'}
. ") unless the first thing after the =over is an =item"
);
}
# Just turn it into a paragraph and reconsider it
$para->[0] = '~Para';
unshift @$paras, $para;
next;
} elsif($over_type eq 'text') {
my $item_type = $self->_get_item_type($para);
# That kills the content of the item if it's a number or bullet.
DEBUG and print STDERR " Item is of type ", $para->[0], " under $over_type\n";
if($item_type eq 'text') {
# Nothing special needs doing for 'text'
} elsif($item_type eq 'number' or $item_type eq 'bullet') {
$self->whine(
$para->[1]{'start_line'},
"Expected text after =item, not a $item_type"
);
# Undo our clobbering:
push @$para, $para->[1]{'~orig_content'};
delete $para->[1]{'number'};
# Only a PROPER item-number element is allowed
# to have a number attribute.
} else {
die "Unhandled item type $item_type"; # should never happen
}
# =item-text thingies don't need any assimilation, it seems.
} elsif($over_type eq 'number') {
my $item_type = $self->_get_item_type($para);
# That kills the content of the item if it's a number or bullet.
DEBUG and print STDERR " Item is of type ", $para->[0], " under $over_type\n";
my $expected_value = ++ $curr_open->[-1][1]{'~counter'};
if($item_type eq 'bullet') {
# Hm, it's not numeric. Correct for this.
$para->[1]{'number'} = $expected_value;
$self->whine(
$para->[1]{'start_line'},
"Expected '=item $expected_value'"
);
push @$para, $para->[1]{'~orig_content'};
# restore the bullet, blocking the assimilation of next para
} elsif($item_type eq 'text') {
# Hm, it's not numeric. Correct for this.
$para->[1]{'number'} = $expected_value;
$self->whine(
$para->[1]{'start_line'},
"Expected '=item $expected_value'"
);
# Text content will still be there and will block next ~Para
} elsif($item_type ne 'number') {
die "Unknown item type $item_type"; # should never happen
} elsif($expected_value == $para->[1]{'number'}) {
DEBUG > 1 and print STDERR " Numeric item has the expected value of $expected_value\n";
} else {
DEBUG > 1 and print STDERR " Numeric item has ", $para->[1]{'number'},
" instead of the expected value of $expected_value\n";
$self->whine(
$para->[1]{'start_line'},
"You have '=item " . $para->[1]{'number'} .
"' instead of the expected '=item $expected_value'"
);
$para->[1]{'number'} = $expected_value; # correcting!!
}
if(@$para == 2) {
# For the cases where we /didn't/ push to @$para
if($paras->[0][0] eq '~Para') {
DEBUG and print STDERR "Assimilating following ~Para content into $over_type item\n";
push @$para, splice @{shift @$paras},2;
} else {
DEBUG and print STDERR "Can't assimilate following ", $paras->[0][0], "\n";
push @$para, ''; # Just so it's not contentless
}
}
} elsif($over_type eq 'bullet') {
my $item_type = $self->_get_item_type($para);
# That kills the content of the item if it's a number or bullet.
DEBUG and print STDERR " Item is of type ", $para->[0], " under $over_type\n";
if($item_type eq 'bullet') {
# as expected!
if( $para->[1]{'~_freaky_para_hack'} ) {
DEBUG and print STDERR "Accomodating '=item * Foo' tolerance hack.\n";
push @$para, delete $para->[1]{'~_freaky_para_hack'};
}
} elsif($item_type eq 'number') {
$self->whine(
$para->[1]{'start_line'},
"Expected '=item *'"
);
push @$para, $para->[1]{'~orig_content'};
# and block assimilation of the next paragraph
delete $para->[1]{'number'};
# Only a PROPER item-number element is allowed
# to have a number attribute.
} elsif($item_type eq 'text') {
$self->whine(
$para->[1]{'start_line'},
"Expected '=item *'"
);
# But doesn't need processing. But it'll block assimilation
# of the next para.
} else {
die "Unhandled item type $item_type"; # should never happen
}
if(@$para == 2) {
# For the cases where we /didn't/ push to @$para
if($paras->[0][0] eq '~Para') {
DEBUG and print STDERR "Assimilating following ~Para content into $over_type item\n";
push @$para, splice @{shift @$paras},2;
} else {
DEBUG and print STDERR "Can't assimilate following ", $paras->[0][0], "\n";
push @$para, ''; # Just so it's not contentless
}
}
} else {
die "Unhandled =over type \"$over_type\"?";
# Shouldn't happen!
}
$para_type = 'Plain';
$para->[0] .= '-' . $over_type;
# Whew. Now fall thru and process it.
} elsif($para_type eq '=extend') {
# Well, might as well implement it here.
$self->_ponder_extend($para);
next; # and skip
} elsif($para_type eq '=encoding') {
# Not actually acted on here, but we catch errors here.
$self->_handle_encoding_second_level($para);
next unless $self->keep_encoding_directive;
$para_type = 'Plain';
} elsif($para_type eq '~Verbatim') {
$para->[0] = 'Verbatim';
$para_type = '?Verbatim';
} elsif($para_type eq '~Para') {
$para->[0] = 'Para';
$para_type = '?Plain';
} elsif($para_type eq 'Data') {
$para->[0] = 'Data';
$para_type = '?Data';
} elsif( $para_type =~ s/^=//s
and defined( $para_type = $self->{'accept_directives'}{$para_type} )
) {
DEBUG > 1 and print STDERR " Pondering known directive ${$para}[0] as $para_type\n";
} else {
# An unknown directive!
DEBUG > 1 and printf STDERR "Unhandled directive %s (Handled: %s)\n",
$para->[0], join(' ', sort keys %{$self->{'accept_directives'}} )
;
$self->whine(
$para->[1]{'start_line'},
"Unknown directive: $para->[0]"
);
# And maybe treat it as text instead of just letting it go?
next;
}
if($para_type =~ s/^\?//s) {
if(! @$curr_open) { # usual case
DEBUG and print STDERR "Treating $para_type paragraph as such because stack is empty.\n";
} else {
my @fors = grep $_->[0] eq '=for', @$curr_open;
DEBUG > 1 and print STDERR "Containing fors: ",
join(',', map $_->[1]{'target'}, @fors), "\n";
if(! @fors) {
DEBUG and print STDERR "Treating $para_type paragraph as such because stack has no =for's\n";
#} elsif(grep $_->[1]{'~resolve'}, @fors) {
#} elsif(not grep !$_->[1]{'~resolve'}, @fors) {
} elsif( $fors[-1][1]{'~resolve'} ) {
# Look to the immediately containing for
if($para_type eq 'Data') {
DEBUG and print STDERR "Treating Data paragraph as Plain/Verbatim because the containing =for ($fors[-1][1]{'target'}) is a resolver\n";
$para->[0] = 'Para';
$para_type = 'Plain';
} else {
DEBUG and print STDERR "Treating $para_type paragraph as such because the containing =for ($fors[-1][1]{'target'}) is a resolver\n";
}
} else {
DEBUG and print STDERR "Treating $para_type paragraph as Data because the containing =for ($fors[-1][1]{'target'}) is a non-resolver\n";
$para->[0] = $para_type = 'Data';
}
}
}
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
if($para_type eq 'Plain') {
$self->_ponder_Plain($para);
} elsif($para_type eq 'Verbatim') {
$self->_ponder_Verbatim($para);
} elsif($para_type eq 'Data') {
$self->_ponder_Data($para);
} else {
die "\$para type is $para_type -- how did that happen?";
# Shouldn't happen.
}
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
$para->[0] =~ s/^[~=]//s;
DEBUG and print STDERR "\n", pretty($para), "\n";
# traverse the treelet (which might well be just one string scalar)
$self->{'content_seen'} ||= 1;
$self->_traverse_treelet_bit(@$para);
}
}
return;
}
###########################################################################
# The sub-ponderers...
sub _ponder_for {
my ($self,$para,$curr_open,$paras) = @_;
# Fake it out as a begin/end
my $target;
if(grep $_->[1]{'~ignore'}, @$curr_open) {
DEBUG > 1 and print STDERR "Ignoring ignorable =for\n";
return 1;
}
for(my $i = 2; $i < @$para; ++$i) {
if($para->[$i] =~ s/^\s*(\S+)\s*//s) {
$target = $1;
last;
}
}
unless(defined $target) {
$self->whine(
$para->[1]{'start_line'},
"=for without a target?"
);
return 1;
}
DEBUG > 1 and
print STDERR "Faking out a =for $target as a =begin $target / =end $target\n";
$para->[0] = 'Data';
unshift @$paras,
['=begin',
{'start_line' => $para->[1]{'start_line'}, '~really' => '=for'},
$target,
],
$para,
['=end',
{'start_line' => $para->[1]{'start_line'}, '~really' => '=for'},
$target,
],
;
return 1;
}
sub _ponder_begin {
my ($self,$para,$curr_open,$paras) = @_;
my $content = join ' ', splice @$para, 2;
$content =~ s/^\s+//s;
$content =~ s/\s+$//s;
unless(length($content)) {
$self->whine(
$para->[1]{'start_line'},
"=begin without a target?"
);
DEBUG and print STDERR "Ignoring targetless =begin\n";
return 1;
}
my ($target, $title) = $content =~ m/^(\S+)\s*(.*)$/;
$para->[1]{'title'} = $title if ($title);
$para->[1]{'target'} = $target; # without any ':'
$content = $target; # strip off the title
$content =~ s/^:!/!:/s;
my $neg; # whether this is a negation-match
$neg = 1 if $content =~ s/^!//s;
my $to_resolve; # whether to process formatting codes
$to_resolve = 1 if $content =~ s/^://s;
my $dont_ignore; # whether this target matches us
foreach my $target_name (
split(',', $content, -1),
$neg ? () : '*'
) {
DEBUG > 2 and
print STDERR " Considering whether =begin $content matches $target_name\n";
next unless $self->{'accept_targets'}{$target_name};
DEBUG > 2 and
print STDERR " It DOES match the acceptable target $target_name!\n";
$to_resolve = 1
if $self->{'accept_targets'}{$target_name} eq 'force_resolve';
$dont_ignore = 1;
$para->[1]{'target_matching'} = $target_name;
last; # stop looking at other target names
}
if($neg) {
if( $dont_ignore ) {
$dont_ignore = '';
delete $para->[1]{'target_matching'};
DEBUG > 2 and print STDERR " But the leading ! means that this is a NON-match!\n";
} else {
$dont_ignore = 1;
$para->[1]{'target_matching'} = '!';
DEBUG > 2 and print STDERR " But the leading ! means that this IS a match!\n";
}
}
$para->[0] = '=for'; # Just what we happen to call these, internally
$para->[1]{'~really'} ||= '=begin';
$para->[1]{'~ignore'} = (! $dont_ignore) || 0;
$para->[1]{'~resolve'} = $to_resolve || 0;
DEBUG > 1 and print STDERR " Making note to ", $dont_ignore ? 'not ' : '',
"ignore contents of this region\n";
DEBUG > 1 and $dont_ignore and print STDERR " Making note to treat contents as ",
($to_resolve ? 'verbatim/plain' : 'data'), " paragraphs\n";
DEBUG > 1 and print STDERR " (Stack now: ", $self->_dump_curr_open(), ")\n";
push @$curr_open, $para;
if(!$dont_ignore or scalar grep $_->[1]{'~ignore'}, @$curr_open) {
DEBUG > 1 and print STDERR "Ignoring ignorable =begin\n";
} else {
$self->{'content_seen'} ||= 1;
$self->_handle_element_start((my $scratch='for'), $para->[1]);
}
return 1;
}
sub _ponder_end {
my ($self,$para,$curr_open,$paras) = @_;
my $content = join ' ', splice @$para, 2;
$content =~ s/^\s+//s;
$content =~ s/\s+$//s;
DEBUG and print STDERR "Ogling '=end $content' directive\n";
unless(length($content)) {
$self->whine(
$para->[1]{'start_line'},
"'=end' without a target?" . (
( @$curr_open and $curr_open->[-1][0] eq '=for' )
? ( " (Should be \"=end " . $curr_open->[-1][1]{'target'} . '")' )
: ''
)
);
DEBUG and print STDERR "Ignoring targetless =end\n";
return 1;
}
unless($content =~ m/^\S+$/) { # i.e., unless it's one word
$self->whine(
$para->[1]{'start_line'},
"'=end $content' is invalid. (Stack: "
. $self->_dump_curr_open() . ')'
);
DEBUG and print STDERR "Ignoring mistargetted =end $content\n";
return 1;
}
unless(@$curr_open and $curr_open->[-1][0] eq '=for') {
$self->whine(
$para->[1]{'start_line'},
"=end $content without matching =begin. (Stack: "
. $self->_dump_curr_open() . ')'
);
DEBUG and print STDERR "Ignoring mistargetted =end $content\n";
return 1;
}
unless($content eq $curr_open->[-1][1]{'target'}) {
$self->whine(
$para->[1]{'start_line'},
"=end $content doesn't match =begin "
. $curr_open->[-1][1]{'target'}
. ". (Stack: "
. $self->_dump_curr_open() . ')'
);
DEBUG and print STDERR "Ignoring mistargetted =end $content at line $para->[1]{'start_line'}\n";
return 1;
}
# Else it's okay to close...
if(grep $_->[1]{'~ignore'}, @$curr_open) {
DEBUG > 1 and print STDERR "Not firing any event for this =end $content because in an ignored region\n";
# And that may be because of this to-be-closed =for region, or some
# other one, but it doesn't matter.
} else {
$curr_open->[-1][1]{'start_line'} = $para->[1]{'start_line'};
# what's that for?
$self->{'content_seen'} ||= 1;
$self->_handle_element_end( my $scratch = 'for', $para->[1]);
}
DEBUG > 1 and print STDERR "Popping $curr_open->[-1][0] $curr_open->[-1][1]{'target'} because of =end $content\n";
pop @$curr_open;
return 1;
}
sub _ponder_doc_end {
my ($self,$para,$curr_open,$paras) = @_;
if(@$curr_open) { # Deal with things left open
DEBUG and print STDERR "Stack is nonempty at end-document: (",
$self->_dump_curr_open(), ")\n";
DEBUG > 9 and print STDERR "Stack: ", pretty($curr_open), "\n";
unshift @$paras, $self->_closers_for_all_curr_open;
# Make sure there is exactly one ~end in the parastack, at the end:
@$paras = grep $_->[0] ne '~end', @$paras;
push @$paras, $para, $para;
# We need two -- once for the next cycle where we
# generate errata, and then another to be at the end
# when that loop back around to process the errata.
return 1;
} else {
DEBUG and print STDERR "Okay, stack is empty now.\n";
}
# Try generating errata section, if applicable
unless($self->{'~tried_gen_errata'}) {
$self->{'~tried_gen_errata'} = 1;
my @extras = $self->_gen_errata();
if(@extras) {
unshift @$paras, @extras;
DEBUG and print STDERR "Generated errata... relooping...\n";
return 1; # I.e., loop around again to process these fake-o paragraphs
}
}
splice @$paras; # Well, that's that for this paragraph buffer.
DEBUG and print STDERR "Throwing end-document event.\n";
$self->_handle_element_end( my $scratch = 'Document' );
return 1; # Hasta la byebye
}
sub _ponder_pod {
my ($self,$para,$curr_open,$paras) = @_;
$self->whine(
$para->[1]{'start_line'},
"=pod directives shouldn't be over one line long! Ignoring all "
. (@$para - 2) . " lines of content"
) if @$para > 3;
# Content ignored unless 'pod_handler' is set
if (my $pod_handler = $self->{'pod_handler'}) {
my ($line_num, $line) = map $_, $para->[1]{'start_line'}, $para->[2];
$line = $line eq '' ? "=pod" : "=pod $line"; # imitate cut_handler output
$pod_handler->($line, $line_num, $self);
}
# The surrounding methods set content_seen, so let us remain consistent.
# I do not know why it was not here before -- should it not be here?
# $self->{'content_seen'} ||= 1;
return;
}
sub _ponder_over {
my ($self,$para,$curr_open,$paras) = @_;
return 1 unless @$paras;
my $list_type;
if($paras->[0][0] eq '=item') { # most common case
$list_type = $self->_get_initial_item_type($paras->[0]);
} elsif($paras->[0][0] eq '=back') {
# Ignore empty lists by default
if ($self->{'parse_empty_lists'}) {
$list_type = 'empty';
} else {
shift @$paras;
return 1;
}
} elsif($paras->[0][0] eq '~end') {
$self->whine(
$para->[1]{'start_line'},
"=over is the last thing in the document?!"
);
return 1; # But feh, ignore it.
} else {
$list_type = 'block';
}
$para->[1]{'~type'} = $list_type;
push @$curr_open, $para;
# yes, we reuse the paragraph as a stack item
my $content = join ' ', splice @$para, 2;
my $overness;
if($content =~ m/^\s*$/s) {
$para->[1]{'indent'} = 4;
} elsif($content =~ m/^\s*((?:\d*\.)?\d+)\s*$/s) {
no integer;
$para->[1]{'indent'} = $1;
if($1 == 0) {
$self->whine(
$para->[1]{'start_line'},
"Can't have a 0 in =over $content"
);
$para->[1]{'indent'} = 4;
}
} else {
$self->whine(
$para->[1]{'start_line'},
"=over should be: '=over' or '=over positive_number'"
);
$para->[1]{'indent'} = 4;
}
DEBUG > 1 and print STDERR "=over found of type $list_type\n";
$self->{'content_seen'} ||= 1;
$self->_handle_element_start((my $scratch = 'over-' . $list_type), $para->[1]);
return;
}
sub _ponder_back {
my ($self,$para,$curr_open,$paras) = @_;
# TODO: fire off </item-number> or </item-bullet> or </item-text> ??
my $content = join ' ', splice @$para, 2;
if($content =~ m/\S/) {
$self->whine(
$para->[1]{'start_line'},
"=back doesn't take any parameters, but you said =back $content"
);
}
if(@$curr_open and $curr_open->[-1][0] eq '=over') {
DEBUG > 1 and print STDERR "=back happily closes matching =over\n";
# Expected case: we're closing the most recently opened thing
#my $over = pop @$curr_open;
$self->{'content_seen'} ||= 1;
$self->_handle_element_end( my $scratch =
'over-' . ( (pop @$curr_open)->[1]{'~type'} ), $para->[1]
);
} else {
DEBUG > 1 and print STDERR "=back found without a matching =over. Stack: (",
join(', ', map $_->[0], @$curr_open), ").\n";
$self->whine(
$para->[1]{'start_line'},
'=back without =over'
);
return 1; # and ignore it
}
}
sub _ponder_item {
my ($self,$para,$curr_open,$paras) = @_;
my $over;
unless(@$curr_open and
$over = (grep { $_->[0] eq '=over' } @$curr_open)[-1]) {
$self->whine(
$para->[1]{'start_line'},
"'=item' outside of any '=over'"
);
unshift @$paras,
['=over', {'start_line' => $para->[1]{'start_line'}}, ''],
$para
;
return 1;
}
my $over_type = $over->[1]{'~type'};
if(!$over_type) {
# Shouldn't happen1
die "Typeless over in stack, starting at line "
. $over->[1]{'start_line'};
} elsif($over_type eq 'block') {
unless($curr_open->[-1][1]{'~bitched_about'}) {
$curr_open->[-1][1]{'~bitched_about'} = 1;
$self->whine(
$curr_open->[-1][1]{'start_line'},
"You can't have =items (as at line "
. $para->[1]{'start_line'}
. ") unless the first thing after the =over is an =item"
);
}
# Just turn it into a paragraph and reconsider it
$para->[0] = '~Para';
unshift @$paras, $para;
return 1;
} elsif($over_type eq 'text') {
my $item_type = $self->_get_item_type($para);
# That kills the content of the item if it's a number or bullet.
DEBUG and print STDERR " Item is of type ", $para->[0], " under $over_type\n";
if($item_type eq 'text') {
# Nothing special needs doing for 'text'
} elsif($item_type eq 'number' or $item_type eq 'bullet') {
$self->whine(
$para->[1]{'start_line'},
"Expected text after =item, not a $item_type"
);
# Undo our clobbering:
push @$para, $para->[1]{'~orig_content'};
delete $para->[1]{'number'};
# Only a PROPER item-number element is allowed
# to have a number attribute.
} else {
die "Unhandled item type $item_type"; # should never happen
}
# =item-text thingies don't need any assimilation, it seems.
} elsif($over_type eq 'number') {
my $item_type = $self->_get_item_type($para);
# That kills the content of the item if it's a number or bullet.
DEBUG and print STDERR " Item is of type ", $para->[0], " under $over_type\n";
my $expected_value = ++ $curr_open->[-1][1]{'~counter'};
if($item_type eq 'bullet') {
# Hm, it's not numeric. Correct for this.
$para->[1]{'number'} = $expected_value;
$self->whine(
$para->[1]{'start_line'},
"Expected '=item $expected_value'"
);
push @$para, $para->[1]{'~orig_content'};
# restore the bullet, blocking the assimilation of next para
} elsif($item_type eq 'text') {
# Hm, it's not numeric. Correct for this.
$para->[1]{'number'} = $expected_value;
$self->whine(
$para->[1]{'start_line'},
"Expected '=item $expected_value'"
);
# Text content will still be there and will block next ~Para
} elsif($item_type ne 'number') {
die "Unknown item type $item_type"; # should never happen
} elsif($expected_value == $para->[1]{'number'}) {
DEBUG > 1 and print STDERR " Numeric item has the expected value of $expected_value\n";
} else {
DEBUG > 1 and print STDERR " Numeric item has ", $para->[1]{'number'},
" instead of the expected value of $expected_value\n";
$self->whine(
$para->[1]{'start_line'},
"You have '=item " . $para->[1]{'number'} .
"' instead of the expected '=item $expected_value'"
);
$para->[1]{'number'} = $expected_value; # correcting!!
}
if(@$para == 2) {
# For the cases where we /didn't/ push to @$para
if($paras->[0][0] eq '~Para') {
DEBUG and print STDERR "Assimilating following ~Para content into $over_type item\n";
push @$para, splice @{shift @$paras},2;
} else {
DEBUG and print STDERR "Can't assimilate following ", $paras->[0][0], "\n";
push @$para, ''; # Just so it's not contentless
}
}
} elsif($over_type eq 'bullet') {
my $item_type = $self->_get_item_type($para);
# That kills the content of the item if it's a number or bullet.
DEBUG and print STDERR " Item is of type ", $para->[0], " under $over_type\n";
if($item_type eq 'bullet') {
# as expected!
if( $para->[1]{'~_freaky_para_hack'} ) {
DEBUG and print STDERR "Accomodating '=item * Foo' tolerance hack.\n";
push @$para, delete $para->[1]{'~_freaky_para_hack'};
}
} elsif($item_type eq 'number') {
$self->whine(
$para->[1]{'start_line'},
"Expected '=item *'"
);
push @$para, $para->[1]{'~orig_content'};
# and block assimilation of the next paragraph
delete $para->[1]{'number'};
# Only a PROPER item-number element is allowed
# to have a number attribute.
} elsif($item_type eq 'text') {
$self->whine(
$para->[1]{'start_line'},
"Expected '=item *'"
);
# But doesn't need processing. But it'll block assimilation
# of the next para.
} else {
die "Unhandled item type $item_type"; # should never happen
}
if(@$para == 2) {
# For the cases where we /didn't/ push to @$para
if($paras->[0][0] eq '~Para') {
DEBUG and print STDERR "Assimilating following ~Para content into $over_type item\n";
push @$para, splice @{shift @$paras},2;
} else {
DEBUG and print STDERR "Can't assimilate following ", $paras->[0][0], "\n";
push @$para, ''; # Just so it's not contentless
}
}
} else {
die "Unhandled =over type \"$over_type\"?";
# Shouldn't happen!
}
$para->[0] .= '-' . $over_type;
return;
}
sub _ponder_Plain {
my ($self,$para) = @_;
DEBUG and print STDERR " giving plain treatment...\n";
unless( @$para == 2 or ( @$para == 3 and $para->[2] eq '' )
or $para->[1]{'~cooked'}
) {
push @$para,
@{$self->_make_treelet(
join("\n", splice(@$para, 2)),
$para->[1]{'start_line'}
)};
}
# Empty paragraphs don't need a treelet for any reason I can see.
# And precooked paragraphs already have a treelet.
return;
}
sub _ponder_Verbatim {
my ($self,$para) = @_;
DEBUG and print STDERR " giving verbatim treatment...\n";
$para->[1]{'xml:space'} = 'preserve';
my $indent = $self->strip_verbatim_indent;
if ($indent && ref $indent eq 'CODE') {
my @shifted = (shift @{$para}, shift @{$para});
$indent = $indent->($para);
unshift @{$para}, @shifted;
}
for(my $i = 2; $i < @$para; $i++) {
foreach my $line ($para->[$i]) { # just for aliasing
# Strip indentation.
$line =~ s/^\Q$indent// if $indent
&& !($self->{accept_codes} && $self->{accept_codes}{VerbatimFormatted});
while( $line =~
# Sort of adapted from Text::Tabs -- yes, it's hardwired in that
# tabs are at every EIGHTH column. For portability, it has to be
# one setting everywhere, and 8th wins.
s/^([^\t]*)(\t+)/$1.(" " x ((length($2)<<3)-(length($1)&7)))/e
) {}
# TODO: whinge about (or otherwise treat) unindented or overlong lines
}
}
# Now the VerbatimFormatted hoodoo...
if( $self->{'accept_codes'} and
$self->{'accept_codes'}{'VerbatimFormatted'}
) {
while(@$para > 3 and $para->[-1] !~ m/\S/) { pop @$para }
# Kill any number of terminal newlines
$self->_verbatim_format($para);
} elsif ($self->{'codes_in_verbatim'}) {
push @$para,
@{$self->_make_treelet(
join("\n", splice(@$para, 2)),
$para->[1]{'start_line'}, $para->[1]{'xml:space'}
)};
$para->[-1] =~ s/\n+$//s; # Kill any number of terminal newlines
} else {
push @$para, join "\n", splice(@$para, 2) if @$para > 3;
$para->[-1] =~ s/\n+$//s; # Kill any number of terminal newlines
}
return;
}
sub _ponder_Data {
my ($self,$para) = @_;
DEBUG and print STDERR " giving data treatment...\n";
$para->[1]{'xml:space'} = 'preserve';
push @$para, join "\n", splice(@$para, 2) if @$para > 3;
return;
}
###########################################################################
sub _traverse_treelet_bit { # for use only by the routine above
my($self, $name) = splice @_,0,2;
my $scratch;
$self->_handle_element_start(($scratch=$name), shift @_);
while (@_) {
my $x = shift;
if (ref($x)) {
&_traverse_treelet_bit($self, @$x);
} else {
$x .= shift while @_ && !ref($_[0]);
$self->_handle_text($x);
}
}
$self->_handle_element_end($scratch=$name);
return;
}
#@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
sub _closers_for_all_curr_open {
my $self = $_[0];
my @closers;
foreach my $still_open (@{ $self->{'curr_open'} || return }) {
my @copy = @$still_open;
$copy[1] = {%{ $copy[1] }};
#$copy[1]{'start_line'} = -1;
if($copy[0] eq '=for') {
$copy[0] = '=end';
} elsif($copy[0] eq '=over') {
$self->whine(
$still_open->[1]{start_line} ,
"=over without closing =back"
);
$copy[0] = '=back';
} else {
die "I don't know how to auto-close an open $copy[0] region";
}
unless( @copy > 2 ) {
push @copy, $copy[1]{'target'};
$copy[-1] = '' unless defined $copy[-1];
# since =over's don't have targets
}
$copy[1]{'fake-closer'} = 1;
DEBUG and print STDERR "Queuing up fake-o event: ", pretty(\@copy), "\n";
unshift @closers, \@copy;
}
return @closers;
}
#--------------------------------------------------------------------------
sub _verbatim_format {
my($it, $p) = @_;
my $formatting;
for(my $i = 2; $i < @$p; $i++) { # work backwards over the lines
DEBUG and print STDERR "_verbatim_format appends a newline to $i: $p->[$i]\n";
$p->[$i] .= "\n";
# Unlike with simple Verbatim blocks, we don't end up just doing
# a join("\n", ...) on the contents, so we have to append a
# newline to ever line, and then nix the last one later.
}
if( DEBUG > 4 ) {
print STDERR "<<\n";
for(my $i = $#$p; $i >= 2; $i--) { # work backwards over the lines
print STDERR "_verbatim_format $i: $p->[$i]";
}
print STDERR ">>\n";
}
for(my $i = $#$p; $i > 2; $i--) {
# work backwards over the lines, except the first (#2)
#next unless $p->[$i] =~ m{^#:([ \^\/\%]*)\n?$}s
# and $p->[$i-1] !~ m{^#:[ \^\/\%]*\n?$}s;
# look at a formatty line preceding a nonformatty one
DEBUG > 5 and print STDERR "Scrutinizing line $i: $$p[$i]\n";
if($p->[$i] =~ m{^#:([ \^\/\%]*)\n?$}s) {
DEBUG > 5 and print STDERR " It's a formatty line. ",
"Peeking at previous line ", $i-1, ": $$p[$i-1]: \n";
if( $p->[$i-1] =~ m{^#:[ \^\/\%]*\n?$}s ) {
DEBUG > 5 and print STDERR " Previous line is formatty! Skipping this one.\n";
next;
} else {
DEBUG > 5 and print STDERR " Previous line is non-formatty! Yay!\n";
}
} else {
DEBUG > 5 and print STDERR " It's not a formatty line. Ignoring\n";
next;
}
# A formatty line has to have #: in the first two columns, and uses
# "^" to mean bold, "/" to mean underline, and "%" to mean bold italic.
# Example:
# What do you want? i like pie. [or whatever]
# #:^^^^^^^^^^^^^^^^^ /////////////
DEBUG > 4 and print STDERR "_verbatim_format considers:\n<$p->[$i-1]>\n<$p->[$i]>\n";
$formatting = ' ' . $1;
$formatting =~ s/\s+$//s; # nix trailing whitespace
unless(length $formatting and $p->[$i-1] =~ m/\S/) { # no-op
splice @$p,$i,1; # remove this line
$i--; # don't consider next line
next;
}
if( length($formatting) >= length($p->[$i-1]) ) {
$formatting = substr($formatting, 0, length($p->[$i-1]) - 1) . ' ';
} else {
$formatting .= ' ' x (length($p->[$i-1]) - length($formatting));
}
# Make $formatting and the previous line be exactly the same length,
# with $formatting having a " " as the last character.
DEBUG > 4 and print STDERR "Formatting <$formatting> on <", $p->[$i-1], ">\n";
my @new_line;
while( $formatting =~ m{\G(( +)|(\^+)|(\/+)|(\%+))}g ) {
#print STDERR "Format matches $1\n";
if($2) {
#print STDERR "SKIPPING <$2>\n";
push @new_line,
substr($p->[$i-1], pos($formatting)-length($1), length($1));
} else {
#print STDERR "SNARING $+\n";
push @new_line, [
(
$3 ? 'VerbatimB' :
$4 ? 'VerbatimI' :
$5 ? 'VerbatimBI' : die("Should never get called")
), {},
substr($p->[$i-1], pos($formatting)-length($1), length($1))
];
#print STDERR "Formatting <$new_line[-1][-1]> as $new_line[-1][0]\n";
}
}
my @nixed =
splice @$p, $i-1, 2, @new_line; # replace myself and the next line
DEBUG > 10 and print STDERR "Nixed count: ", scalar(@nixed), "\n";
DEBUG > 6 and print STDERR "New version of the above line is these tokens (",
scalar(@new_line), "):",
map( ref($_)?"<@$_> ":"<$_>", @new_line ), "\n";
$i--; # So the next line we scrutinize is the line before the one
# that we just went and formatted
}
$p->[0] = 'VerbatimFormatted';
# Collapse adjacent text nodes, just for kicks.
for( my $i = 2; $i > $#$p; $i++ ) { # work forwards over the tokens except for the last
if( !ref($p->[$i]) and !ref($p->[$i + 1]) ) {
DEBUG > 5 and print STDERR "_verbatim_format merges {$p->[$i]} and {$p->[$i+1]}\n";
$p->[$i] .= splice @$p, $i+1, 1; # merge
--$i; # and back up
}
}
# Now look for the last text token, and remove the terminal newline
for( my $i = $#$p; $i >= 2; $i-- ) {
# work backwards over the tokens, even the first
if( !ref($p->[$i]) ) {
if($p->[$i] =~ s/\n$//s) {
DEBUG > 5 and print STDERR "_verbatim_format killed the terminal newline on #$i: {$p->[$i]}, after {$p->[$i-1]}\n";
} else {
DEBUG > 5 and print STDERR
"No terminal newline on #$i: {$p->[$i]}, after {$p->[$i-1]} !?\n";
}
last; # we only want the next one
}
}
return;
}
#@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
sub _treelet_from_formatting_codes {
# Given a paragraph, returns a treelet. Full of scary tokenizing code.
# Like [ '~Top', {'start_line' => $start_line},
# "I like ",
# [ 'B', {}, "pie" ],
# "!"
# ]
my($self, $para, $start_line, $preserve_space) = @_;
my $treelet = ['~Top', {'start_line' => $start_line},];
unless ($preserve_space || $self->{'preserve_whitespace'}) {
$para =~ s/\s+/ /g; # collapse and trim all whitespace first.
$para =~ s/ $//;
$para =~ s/^ //;
}
# Only apparent problem the above code is that N<< >> turns into
# N<< >>. But then, word wrapping does that too! So don't do that!
my @stack;
my @lineage = ($treelet);
my $raw = ''; # raw content of L<> fcode before splitting/processing
# XXX 'raw' is not 100% accurate: all surrounding whitespace is condensed
# into just 1 ' '. Is this the regex's doing or 'raw's?
my $inL = 0;
DEBUG > 4 and print STDERR "Paragraph:\n$para\n\n";
# Here begins our frightening tokenizer RE. The following regex matches
# text in four main parts:
#
# * Start-codes. The first alternative matches C< or C<<, the latter
# followed by some whitespace. $1 will hold the entire start code
# (including any space following a multiple-angle-bracket delimiter),
# and $2 will hold only the additional brackets past the first in a
# multiple-bracket delimiter. length($2) + 1 will be the number of
# closing brackets we have to find.
#
# * Closing brackets. Match some amount of whitespace followed by
# multiple close brackets. The logic to see if this closes anything
# is down below. Note that in order to parse C<< >> correctly, we
# have to use look-behind (?<=\s\s), since the match of the starting
# code will have consumed the whitespace.
#
# * A single closing bracket, to close a simple code like C<>.
#
# * Something that isn't a start or end code. We have to be careful
# about accepting whitespace, since perlpodspec says that any whitespace
# before a multiple-bracket closing delimiter should be ignored.
#
while($para =~
m/\G
(?:
# Match starting codes, including the whitespace following a
# multiple-delimiter start code. $1 gets the whole start code and
# $2 gets all but one of the <s in the multiple-bracket case.
([A-Z]<(?:(<+)\s+)?)
|
# Match multiple-bracket end codes. $3 gets the whitespace that
# should be discarded before an end bracket but kept in other cases
# and $4 gets the end brackets themselves.
(\s+|(?<=\s\s))(>{2,})
|
(\s?>) # $5: simple end-codes
|
( # $6: stuff containing no start-codes or end-codes
(?:
[^A-Z\s>]
|
(?:
[A-Z](?!<)
)
|
# whitespace is ok, but we don't want to eat the whitespace before
# a multiple-bracket end code.
# NOTE: we may still have problems with e.g. S<< >>
(?:
\s(?!\s*>{2,})
)
)+
)
)
/xgo
) {
DEBUG > 4 and print STDERR "\nParagraphic tokenstack = (@stack)\n";
if(defined $1) {
if(defined $2) {
DEBUG > 3 and print STDERR "Found complex start-text code \"$1\"\n";
push @stack, length($2) + 1;
# length of the necessary complex end-code string
} else {
DEBUG > 3 and print STDERR "Found simple start-text code \"$1\"\n";
push @stack, 0; # signal that we're looking for simple
}
push @lineage, [ substr($1,0,1), {}, ]; # new node object
push @{ $lineage[-2] }, $lineage[-1];
if ('L' eq substr($1,0,1)) {
$raw = $inL ? $raw.$1 : ''; # reset raw content accumulator
$inL = 1;
} else {
$raw .= $1 if $inL;
}
} elsif(defined $4) {
DEBUG > 3 and print STDERR "Found apparent complex end-text code \"$3$4\"\n";
# This is where it gets messy...
if(! @stack) {
# We saw " >>>>" but needed nothing. This is ALL just stuff then.
DEBUG > 4 and print STDERR " But it's really just stuff.\n";
push @{ $lineage[-1] }, $3, $4;
next;
} elsif(!$stack[-1]) {
# We saw " >>>>" but needed only ">". Back pos up.
DEBUG > 4 and print STDERR " And that's more than we needed to close simple.\n";
push @{ $lineage[-1] }, $3; # That was a for-real space, too.
pos($para) = pos($para) - length($4) + 1;
} elsif($stack[-1] == length($4)) {
# We found " >>>>", and it was exactly what we needed. Commonest case.
DEBUG > 4 and print STDERR " And that's exactly what we needed to close complex.\n";
} elsif($stack[-1] < length($4)) {
# We saw " >>>>" but needed only " >>". Back pos up.
DEBUG > 4 and print STDERR " And that's more than we needed to close complex.\n";
pos($para) = pos($para) - length($4) + $stack[-1];
} else {
# We saw " >>>>" but needed " >>>>>>". So this is all just stuff!
DEBUG > 4 and print STDERR " But it's really just stuff, because we needed more.\n";
push @{ $lineage[-1] }, $3, $4;
next;
}
#print STDERR "\nHOOBOY ", scalar(@{$lineage[-1]}), "!!!\n";
push @{ $lineage[-1] }, '' if 2 == @{ $lineage[-1] };
# Keep the element from being childless
pop @stack;
pop @lineage;
unless (@stack) { # not in an L if there are no open fcodes
$inL = 0;
if (ref $lineage[-1][-1] && $lineage[-1][-1][0] eq 'L') {
$lineage[-1][-1][1]{'raw'} = $raw
}
}
$raw .= $3.$4 if $inL;
} elsif(defined $5) {
DEBUG > 3 and print STDERR "Found apparent simple end-text code \"$5\"\n";
if(@stack and ! $stack[-1]) {
# We're indeed expecting a simple end-code
DEBUG > 4 and print STDERR " It's indeed an end-code.\n";
if(length($5) == 2) { # There was a space there: " >"
push @{ $lineage[-1] }, ' ';
} elsif( 2 == @{ $lineage[-1] } ) { # Closing a childless element
push @{ $lineage[-1] }, ''; # keep it from being really childless
}
pop @stack;
pop @lineage;
} else {
DEBUG > 4 and print STDERR " It's just stuff.\n";
push @{ $lineage[-1] }, $5;
}
unless (@stack) { # not in an L if there are no open fcodes
$inL = 0;
if (ref $lineage[-1][-1] && $lineage[-1][-1][0] eq 'L') {
$lineage[-1][-1][1]{'raw'} = $raw
}
}
$raw .= $5 if $inL;
} elsif(defined $6) {
DEBUG > 3 and print STDERR "Found stuff \"$6\"\n";
push @{ $lineage[-1] }, $6;
$raw .= $6 if $inL;
# XXX does not capture multiplace whitespaces -- 'raw' ends up with
# at most 1 leading/trailing whitespace, why not all of it?
} else {
# should never ever ever ever happen
DEBUG and print STDERR "AYYAYAAAAA at line ", __LINE__, "\n";
die "SPORK 512512!";
}
}
if(@stack) { # Uhoh, some sequences weren't closed.
my $x= "...";
while(@stack) {
push @{ $lineage[-1] }, '' if 2 == @{ $lineage[-1] };
# Hmmmmm!
my $code = (pop @lineage)->[0];
my $ender_length = pop @stack;
if($ender_length) {
--$ender_length;
$x = $code . ("<" x $ender_length) . " $x " . (">" x $ender_length);
} else {
$x = $code . "<$x>";
}
}
DEBUG > 1 and print STDERR "Unterminated $x sequence\n";
$self->whine($start_line,
"Unterminated $x sequence",
);
}
return $treelet;
}
#@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
sub text_content_of_treelet { # method: $parser->text_content_of_treelet($lol)
return stringify_lol($_[1]);
}
sub stringify_lol { # function: stringify_lol($lol)
my $string_form = '';
_stringify_lol( $_[0] => \$string_form );
return $string_form;
}
sub _stringify_lol { # the real recursor
my($lol, $to) = @_;
for(my $i = 2; $i < @$lol; ++$i) {
if( ref($lol->[$i] || '') and UNIVERSAL::isa($lol->[$i], 'ARRAY') ) {
_stringify_lol( $lol->[$i], $to); # recurse!
} else {
$$to .= $lol->[$i];
}
}
return;
}
#@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
sub _dump_curr_open { # return a string representation of the stack
my $curr_open = $_[0]{'curr_open'};
return '[empty]' unless @$curr_open;
return join '; ',
map {;
($_->[0] eq '=for')
? ( ($_->[1]{'~really'} || '=over')
. ' ' . $_->[1]{'target'})
: $_->[0]
}
@$curr_open
;
}
###########################################################################
my %pretty_form = (
"\a" => '\a', # ding!
"\b" => '\b', # BS
"\e" => '\e', # ESC
"\f" => '\f', # FF
"\t" => '\t', # tab
"\cm" => '\cm',
"\cj" => '\cj',
"\n" => '\n', # probably overrides one of either \cm or \cj
'"' => '\"',
'\\' => '\\\\',
'$' => '\\$',
'@' => '\\@',
'%' => '\\%',
'#' => '\\#',
);
sub pretty { # adopted from Class::Classless
# Not the most brilliant routine, but passable.
# Don't give it a cyclic data structure!
my @stuff = @_; # copy
my $x;
my $out =
# join ",\n" .
join ", ",
map {;
if(!defined($_)) {
"undef";
} elsif(ref($_) eq 'ARRAY' or ref($_) eq 'Pod::Simple::LinkSection') {
$x = "[ " . pretty(@$_) . " ]" ;
$x;
} elsif(ref($_) eq 'SCALAR') {
$x = "\\" . pretty($$_) ;
$x;
} elsif(ref($_) eq 'HASH') {
my $hr = $_;
$x = "{" . join(", ",
map(pretty($_) . '=>' . pretty($hr->{$_}),
sort keys %$hr ) ) . "}" ;
$x;
} elsif(!length($_)) { q{''} # empty string
} elsif(
$_ eq '0' # very common case
or(
m/^-?(?:[123456789]\d*|0)(?:\.\d+)?$/s
and $_ ne '-0' # the strange case that RE lets thru
)
) { $_;
} else {
# Yes, explicitly name every character desired. There are shorcuts one
# could make, but I (Karl Williamson) was afraid that some Perl
# releases would have bugs in some of them. For example [A-Z] works
# even on EBCDIC platforms to match exactly the 26 uppercase English
# letters, but I don't know if it has always worked without bugs. It
# seemed safest just to list the characters.
# s<([^\x20\x21\x23\x27-\x3F\x41-\x5B\x5D-\x7E])>
s<([^ !#'()*+,\-./0123456789:;\<=\>?ABCDEFGHIJKLMNOPQRSTUVWXYZ\[\]^_`abcdefghijklmnopqrstuvwxyz{|}~])>
<$pretty_form{$1} || '\\x{'.sprintf("%x", ord($1)).'}'>eg;
#<$pretty_form{$1} || '\\x'.(unpack("H2",$1))>eg;
qq{"$_"};
}
} @stuff;
# $out =~ s/\n */ /g if length($out) < 75;
return $out;
}
#@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
# A rather unsubtle method of blowing away all the state information
# from a parser object so it can be reused. Provided as a utility for
# backward compatibility in Pod::Man, etc. but not recommended for
# general use.
sub reinit {
my $self = shift;
foreach (qw(source_dead source_filename doc_has_started
start_of_pod_block content_seen last_was_blank paras curr_open
line_count pod_para_count in_pod ~tried_gen_errata all_errata errata errors_seen
Title)) {
delete $self->{$_};
}
}
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1;