/usr/share/perl5/HTML/Lint/Parser.pm is in libhtml-lint-perl 2.22+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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use warnings;
use strict;
use HTML::Parser 3.20;
use HTML::Tagset 3.03;
use HTML::Lint::HTML4 qw( %isKnownAttribute %isRequired %isNonrepeatable %isObsolete );
use HTML::Entities qw( %char2entity );
use base 'HTML::Parser';
=head1 NAME
HTML::Lint::Parser - Parser for HTML::Lint. No user-serviceable parts inside.
=head1 VERSION
Version 2.22
=cut
our $VERSION = '2.22';
=head1 SYNOPSIS
See L<HTML::Lint> for all the gory details.
=head1 METHODS
=head2 new( $gripe )
Constructor for the main parsing object. The I<$gripe> argument
is a coderef to a function that can handle errors from the parser.
It is only ever (so far) C<HTML::Lint::gripe()>.
=cut
sub new {
my $class = shift;
my $gripe = shift;
my $self =
HTML::Parser->new(
api_version => 3,
start_document_h => [ \&_start_document, 'self' ],
end_document_h => [ \&_end_document, 'self,line,column' ],
start_h => [ \&_start, 'self,tagname,line,column,@attr' ],
end_h => [ \&_end, 'self,tagname,line,column,tokenpos,@attr' ],
comment_h => [ \&_comment, 'self,tagname,line,column,text' ],
text_h => [ \&_text, 'self,text' ],
strict_names => 0,
empty_element_tags => 1,
);
bless $self, $class;
$self->{_gripe} = $gripe;
$self->{_stack} = [];
$self->{_directives} = {};
return $self;
}
=head2 $parser->gripe( $errorcode, [ arg1=>val1, ...] )
Calls the passed-in gripe function.
If a given directive has been set to turn off a given message, then
the parent gripe never gets called.
=cut
sub gripe {
my $self = shift;
my $errorcode = shift;
if ( $self->_displayable( $errorcode ) ) {
$self->{_gripe}->( $errorcode, @_ );
}
return;
}
sub _displayable {
my $self = shift;
my $errorcode = shift;
my $directives = $self->{_directives};
if ( not defined $directives->{$errorcode} ) {
return 1;
}
else {
return $directives->{$errorcode};
}
}
sub _start_document {
return;
}
sub _end_document {
my ($self,$line,$column) = @_;
for my $tag ( sort keys %isRequired ) {
if ( !$self->{_first_seen}->{$tag} ) {
$self->gripe( 'doc-tag-required', tag => $tag );
}
}
return;
}
sub _start {
my ($self,$tag,$line,$column,@attr) = @_;
$self->{_line} = $line;
$self->{_column} = $column;
my $validattr = $isKnownAttribute{ $tag };
if ( $validattr ) {
my %seen;
my $i = 0;
while ( $i < @attr ) {
my ($attr,$val) = @attr[$i++,$i++];
if ( $seen{$attr}++ ) {
$self->gripe( 'attr-repeated', tag => $tag, attr => $attr );
}
if ( !$validattr->{$attr} ) {
$self->gripe( 'attr-unknown', tag => $tag, attr => $attr );
}
} # while attribs
}
else {
$self->gripe( 'elem-unknown', tag => $tag );
}
$self->_element_push( $tag ) unless $HTML::Tagset::emptyElement{ $tag };
if ( my $where = $self->{_first_seen}{$tag} ) {
if ( $isNonrepeatable{$tag} ) {
$self->gripe( 'elem-nonrepeatable',
tag => $tag,
where => HTML::Lint::Error::where( @{$where} )
);
}
}
else {
$self->{_first_seen}{$tag} = [$line,$column];
}
# Call any other overloaded func
my $tagfunc = "_start_$tag";
if ( $self->can($tagfunc) ) {
$self->$tagfunc( $tag, @attr );
}
return;
}
sub _text {
my ($self,$text) = @_;
while ( $text =~ /&(?![#0-9a-z])/ig ) {
$self->gripe( 'text-use-entity', char => '&', entity => '&' );
}
while ( $text =~ /([^\x09\x0A\x0D -~])/g ) {
my $bad = $1;
$self->gripe(
'text-use-entity',
char => sprintf( '\x%02lX', ord($bad) ),
entity => $char2entity{ $bad },
);
}
if ( not $self->{_unclosed_entities_regex} ) {
# Get Gisle's list
my @entities = sort keys %HTML::Entities::entity2char;
# Strip his semicolons
s/;$// for @entities;
# Build a regex
my $entities = join( '|', @entities );
$self->{_unclosed_entities_regex} = qr/&($entities)(?!;)/;
$self->{_entity_lookup} = { map { ($_,1) } @entities };
}
while ( $text =~ m/$self->{_unclosed_entities_regex}/g ) {
my $ent = $1;
$self->gripe( 'text-unclosed-entity', entity => "&$ent;" );
}
while ( $text =~ m/&([^;]+);/g ) {
my $ent = $1;
# Numeric entities are fine, if they're not too large.
if ( $ent =~ /^#(\d+)$/ ) {
if ( $1 > 65536 ) {
$self->gripe( 'text-invalid-entity', entity => "&$ent;" );
}
next;
}
# Hex entities are fine, if they're not too large.
if ( $ent =~ /^#x([\dA-F]+)$/i ) {
if ( length($1) > 4 ) {
$self->gripe( 'text-invalid-entity', entity => "&$ent;" );
}
next;
}
# If it's not a numeric entity, then check the lookup table.
if ( !exists $self->{_entity_lookup}{$ent} ) {
$self->gripe( 'text-unknown-entity', entity => "&$ent;" );
}
}
return;
}
sub _comment {
my ($self,$tagname,$line,$column,$text) = @_;
# Look for the html-lint directives
if ( $tagname =~ m/^\s*html-lint\s*(.+)\s*$/ ) {
my $text = $1;
my @commands = split( /\s*,\s*/, $text );
for my $command ( @commands ) {
my ($directive,$value) = split( /\s*:\s*/, $command, 2 );
_trim($_) for ($directive,$value);
if ( ($directive ne 'all') &&
( not exists $HTML::Lint::Error::errors{ $directive } ) ) {
$self->gripe( 'config-unknown-directive',
directive => $directive,
where => HTML::Lint::Error::where($line,$column)
);
next;
}
my $normalized_value = _normalize_value( $value );
if ( !defined($normalized_value) ) {
$self->gripe( 'config-unknown-value',
directive => $directive,
value => $value,
where => HTML::Lint::Error::where($line,$column)
);
next;
}
if ( $directive eq 'all' ) {
for my $err ( keys %HTML::Lint::Error::errors ) {
$self->_set_directive( $err, $normalized_value );
}
}
else {
$self->_set_directive( $directive, $normalized_value );
}
}
}
return;
}
sub _set_directive {
my $self = shift;
my $which = shift;
my $what = shift;
$self->{_directives}{$which} = $what;
return;
}
sub _normalize_value {
my $what = shift;
$what = _trim( $what );
return 1 if $what =~ /^(?:1|on|true)$/;
return 0 if $what =~ /^(?:0|off|false)$/;
return undef;
}
sub _trim {
$_[0] =~ s/^\s+//;
$_[0] =~ s/\s+$//;
return $_[0];
}
sub _end {
my ($self,$tag,$line,$column,$tokenpos,@attr) = @_;
$self->{_line} = $line;
$self->{_column} = $column;
if ( !$tokenpos ) {
# This is a dummy end event for something like <img />.
# Do nothing.
}
elsif ( $HTML::Tagset::emptyElement{ $tag } ) {
$self->gripe( 'elem-empty-but-closed', tag => $tag );
}
else {
if ( $self->_in_context($tag) ) {
my @leftovers = $self->_element_pop_back_to($tag);
for ( @leftovers ) {
my ($tag,$line,$col) = @{$_};
$self->gripe( 'elem-unclosed', tag => $tag,
where => HTML::Lint::Error::where($line,$col) )
unless $HTML::Tagset::optionalEndTag{$tag};
} # for
}
else {
$self->gripe( 'elem-unopened', tag => $tag );
}
} # is empty element
# Call any other overloaded func
my $tagfunc = "_end_$tag";
if ( $self->can($tagfunc) ) {
$self->$tagfunc( $tag, $line );
}
return;
}
sub _element_push {
my $self = shift;
for ( @_ ) {
push( @{$self->{_stack}}, [$_,$self->{_line},$self->{_column}] );
} # while
return;
}
sub _find_tag_in_stack {
my $self = shift;
my $tag = shift;
my $stack = $self->{_stack};
my $offset = @{$stack} - 1;
while ( $offset >= 0 ) {
if ( $stack->[$offset][0] eq $tag ) {
return $offset;
}
--$offset;
} # while
return;
}
sub _element_pop_back_to {
my $self = shift;
my $tag = shift;
my $offset = $self->_find_tag_in_stack($tag) or return;
my @leftovers = splice( @{$self->{_stack}}, $offset + 1 );
pop @{$self->{_stack}};
return @leftovers;
}
sub _in_context {
my $self = shift;
my $tag = shift;
my $offset = $self->_find_tag_in_stack($tag);
return defined $offset;
}
# Overridden tag-specific stuff
sub _start_img {
my ($self,$tag,%attr) = @_;
my ($h,$w,$src) = @attr{qw( height width src )};
if ( defined $h && defined $w ) {
# Check sizes
}
else {
$self->gripe( 'elem-img-sizes-missing', src=>$src );
}
if ( not defined $attr{alt} ) {
$self->gripe( 'elem-img-alt-missing', src=>$src );
}
return;
}
sub _start_input {
my ($self,$tag,%attr) = @_;
my ($type,$alt) = @attr{qw( type alt )};
if ( lc($type) eq 'image' ) {
my $ok = defined($alt);
if ( $ok ) {
$alt =~ s/^ +//;
$alt =~ s/ +$//;
$ok = ($alt ne '');
}
if ( !$ok ) {
my $name = $attr{name};
$name = '' unless defined $name;
$self->gripe( 'elem-input-alt-missing', name => $name );
}
}
return;
}
1;
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