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BlackBox.pm
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BlackBox.pm
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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 = '3.24';
#use constant DEBUG => 7;
BEGIN {
require Pod::Simple;
*DEBUG = \&Pod::Simple::DEBUG unless defined &DEBUG
}
#@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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 "# Parsing starting at line ", $self->{'line_count'}, ".\n";
DEBUG > 5 and
print "# About to parse lines: ",
join(' ', map defined($_) ? "[$_]" : "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 "# Source is dead.\n";
last;
}
unless( defined $source_line ) {
DEBUG > 4 and print "# Undef-line seen.\n";
push @$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 = $source_line) =~ tr/\n\r//d;
# If we don't have two vars, we'll end up with that there
# tr/// modding the (potentially read-only) original source line!
} else {
DEBUG > 2 and print "First line: [$source_line]\n";
if( ($line = $source_line) =~ s/^\xEF\xBB\xBF//s ) {
DEBUG and print "UTF-8 BOM seen. Faking a '=encoding utf8'.\n";
$self->_handle_encoding_line( "=encoding utf8" );
$line =~ tr/\n\r//d;
} elsif( $line =~ s/^\xFE\xFF//s ) {
DEBUG and print "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 "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 "First line is BOM-less.\n";
($line = $source_line) =~ tr/\n\r//d;
}
}
if(!$self->parse_characters && !$self->{'encoding'}) {
$self->_try_encoding_guess($line)
}
DEBUG > 5 and print "# Parsing line: [$line]\n";
if(!$self->{'in_pod'}) {
if($line =~ m/^=([a-zA-Z]+)/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 "# 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 $2 and print "# Setting fname to \"$fname\"\n";
DEBUG > 1 and print "# 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 "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 "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 "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 "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 "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 "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 "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 "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'} = $self->{'start_of_pod_block'} = 0;
}
} # ends the big while loop
DEBUG > 1 and print(pretty(@$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 "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 "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 $enc_error;
}
} elsif (
# OK, let's turn on the encoding
do {
DEBUG > 1 and print " Setting encoding to $e\n";
$self->{'encoding'} = $e;
1;
}
and $e eq 'HACKRAW'
) {
DEBUG and print " Putting in HACKRAW (no-op) encoding mode.\n";
} elsif( Pod::Simple::Transcode::->encoding_is_available($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: $@\nAborting"
);
} else {
my @supported = Pod::Simple::Transcode::->all_encodings;
# Note unsupported, and complain
DEBUG and print " Encoding [$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'} }, $enc_error;
return '=encoding ALREADYDONE';
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
sub _handle_encoding_second_level {
# By time this is called, the encoding (if well formed) will already
# have been acted one.
my($self, $para) = @_;
my @x = @$para;
my $content = join ' ', splice @x, 2;
$content =~ s/^\s+//s;
$content =~ s/\s+$//s;
DEBUG > 2 and print "Ogling encoding directive: =encoding $content\n";
if($content eq 'ALREADYDONE') {
# It's already been handled. Check for errors.
if(! $self->{'encoding_command_statuses'} ) {
DEBUG > 2 and print " 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 " (Yup, it was successfully handled already.)\n";
}
} else {
# Otherwise it's a syntax error
$self->whine( $para->[1]{'start_line'},
"Invalid =encoding syntax: $content"
);
}
return;
}
sub _try_encoding_guess {
my ($self,$line) = @_;
if(!$self->{'in_pod'} and $line !~ /^=/m) {
return; # don't whine about non-ASCII bytes in code/comments
}
return unless $line =~ /[^\x00-\x7f]/; # Look for non-ASCII byte
my $encoding = $line =~ /^[\x00-\x7f]*[\xC0-\xFD][\x80-\xBF]/ ? 'UTF-8' : 'ISO8859-1';
$self->_handle_encoding_line( "=encoding $encoding" );
$self->{'_transcoder'} && $self->{'_transcoder'}->($line);
my ($word) = $line =~ /(\S*[^\x00-\x7f]\S*)/;
$self->whine(
$self->{'line_count'},
"Non-ASCII character seen before =encoding in '$word'. Assuming $encoding"
);
}
#~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`
{
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 "\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 $scratch;
DEBUG > 10 and print "# Paragraph buffer: <<", pretty($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 "# 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 "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 "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 "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 $curr_open->[-1][0] eq '=over'
) {
DEBUG > 2 and print "'=$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 " 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') {
die "Unknown item type $item_type"
unless $item_type eq 'number' or $item_type eq 'bullet';
# Undo our clobbering:
push @$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 " 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 " Numeric item has the expected value of $expected_value\n";
} else {
DEBUG > 1 and print " 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 "Assimilating following ~Para content into $over_type item\n";
push @$para, splice @{shift @$paras},2;
} else {
DEBUG and print "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 " Item is of type ", $para->[0], " under $over_type\n";
if($item_type eq 'bullet') {
# as expected!
if( $para->[1]{'~_freaky_para_hack'} ) {
DEBUG and print "Accomodating '=item * Foo' tolerance hack.\n";
push @$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 "Assimilating following ~Para content into $over_type item\n";
push @$para, splice @{shift @$paras},2;
} else {
DEBUG and print "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; # and skip
} 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 " Pondering known directive ${$para}[0] as $para_type\n";
} else {
# An unknown directive!
DEBUG > 1 and printf "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 "Treating $para_type paragraph as such because stack is empty.\n";
} else {
my @fors = grep $_->[0] eq '=for', @$curr_open;
DEBUG > 1 and print "Containing fors: ",
join(',', map $_->[1]{'target'}, @fors), "\n";
if(! @fors) {
DEBUG and print "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 "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 "Treating $para_type paragraph as such because the containing =for ($fors[-1][1]{'target'}) is a resolver\n";
}
} else {
DEBUG and print "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.
}
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
$para->[0] =~ s/^[~=]//s;
DEBUG and print "\n", pretty($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 "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 "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(
$para->[1]{'start_line'},
"=begin without a target?"
);
DEBUG and print "Ignoring targetless =begin\n";
return 1;
}
my ($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 " Considering whether =begin $content matches $target_name\n";
next unless $self->{'accept_targets'}{$target_name};
DEBUG > 2 and
print " 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 " But the leading ! means that this is a NON-match!\n";
} else {
$dont_ignore = 1;
$para->[1]{'target_matching'} = '!';
DEBUG > 2 and print " 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 " Making note to ", $dont_ignore ? 'not ' : '',
"ignore contents of this region\n";
DEBUG > 1 and $dont_ignore and print " Making note to treat contents as ",