/usr/share/perl5/HTML/HTML5/Parser/Charset/UnicodeChecker.pm is in libhtml-html5-parser-perl 0.301-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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## skip Test::Tabs
use strict;
our $VERSION = '0.301';
## NOTE: For more information (including rationals of checks performed
## in this module), see
## <http://suika.fam.cx/gate/2005/sw/Unicode%E7%AC%A6%E5%8F%B7%E5%8C%96%E6%96%87%E5%AD%97%E5%88%97%E3%81%AE%E9%81%A9%E5%90%88%E6%80%A7>.
## NOTE: Unicode's definition for character string conformance is
## very, very vague so that it is difficult to determine what error
## level is appropriate for each error. The Unicode Standard abuses
## conformance-creteria-like terms such as "deprecated", "discouraged",
## "preferred", "better", "not encouraged", "should", and so on with no
## clear explanation of their difference (if any) or relationship to
## the conformance. In fact, that specification does not define the
## conformance class for character strings.
sub new_handle ($$;$) {
my $self = bless {
queue => [],
new_queue => [],
onerror => sub {},
#onerror_set
level => {
unicode_should => 'w',
unicode_deprecated => 'w', # = unicode_should
unicode_discouraged => 'w',
unicode_preferred => 'w',
## NOTE: We do some "unification" of levels - for example,
## "not encouraged" is unified with "discouraged" and
## "better" is unified with "preferred".
must => 'm',
warn => 'w',
},
}, $_[0];
$self->{handle} = $_[1]; # char stream
my $mode = $_[2] || 'default'; # or 'html5'
$self->{level_map} = {
## Unicode errors
'unicode deprecated' => 'unicode_deprecated',
'nonchar' => $mode eq 'html5' ? 'must' : 'unicode_should',
## NOTE: HTML5 parse error.
'unicode should' => 'unicode_should',
'unicode discouraged' => 'unicode_discouraged',
'unicode not preferred' => 'unicode_preferred',
## HTML5 errors (See "text" definition of the spec)
'control char' => $mode eq 'html5' ? 'must' : 'warn',
## NOTE: HTML5 parse error.
'non unicode' => $mode eq 'html5' ? 'must' : 'warn',
## NOTE: In HTML5, replaced by U+FFFD (not a parse error).
};
$self->{replace_non_unicode} = ($mode eq 'html5');
return $self;
} # new_handle
my $etypes = {
0x0340 => 'unicode deprecated',
0x0341 => 'unicode deprecated',
0x17A3 => 'unicode deprecated',
0x17D3 => 'unicode deprecated',
0x206A => 'unicode deprecated',
0x206B => 'unicode deprecated',
0x206C => 'unicode deprecated',
0x206D => 'unicode deprecated',
0x206E => 'unicode deprecated',
0x206F => 'unicode deprecated',
0xE0001 => 'unicode deprecated',
0xFFFE => 'nonchar',
0xFFFF => 'nonchar',
0x1FFFE => 'nonchar',
0x1FFFF => 'nonchar',
0x2FFFE => 'nonchar',
0x2FFFF => 'nonchar',
0x3FFFE => 'nonchar',
0x3FFFF => 'nonchar',
0x4FFFE => 'nonchar',
0x4FFFF => 'nonchar',
0x5FFFE => 'nonchar',
0x5FFFF => 'nonchar',
0x6FFFE => 'nonchar',
0x6FFFF => 'nonchar',
0x7FFFE => 'nonchar',
0x7FFFF => 'nonchar',
0x8FFFE => 'nonchar',
0x8FFFF => 'nonchar',
0x9FFFE => 'nonchar',
0x9FFFF => 'nonchar',
0xAFFFE => 'nonchar',
0xAFFFF => 'nonchar',
0xBFFFE => 'nonchar',
0xBFFFF => 'nonchar',
0xCFFFE => 'nonchar',
0xCFFFF => 'nonchar',
0xDFFFE => 'nonchar',
0xDFFFF => 'nonchar',
0xEFFFE => 'nonchar',
0xEFFFF => 'nonchar',
0xFFFFE => 'nonchar',
0xFFFFF => 'nonchar',
0x10FFFE => 'nonchar',
0x10FFFF => 'nonchar',
0x0344 => 'unicode should', # COMBINING GREEK DIALYTIKA TONOS
0x03D3 => 'unicode should', # GREEK UPSILON WITH ...
0x03D4 => 'unicode should', # GREEK UPSILON WITH ...
0x20A4 => 'unicode should', # LIRA SIGN
0x2126 => 'unicode should', # OHM SIGN # also, discouraged
0x212A => 'unicode should', # KELVIN SIGN
0x212B => 'unicode should', # ANGSTROM SIGN
## Styled overlines/underlines in CJK Compatibility Forms
0xFE49 => 'unicode discouraged',
0xFE4A => 'unicode discouraged',
0xFE4B => 'unicode discouraged',
0xFE4C => 'unicode discouraged',
0xFE4D => 'unicode discouraged',
0xFE4E => 'unicode discouraged',
0xFE4F => 'unicode discouraged',
0x037E => 'unicode discouraged', # greek punctuations
0x0387 => 'unicode discouraged', # greek punctuations
#0x17A3 => 'unicode discouraged', # also, deprecated
0x17A4 => 'unicode discouraged',
0x17B4 => 'unicode discouraged',
0x17B5 => 'unicode discouraged',
0x17D8 => 'unicode discouraged',
0x2121 => 'unicode discouraged', # tel
0x213B => 'unicode discouraged', # fax
#0x2120 => 'unicode discouraged', # SM (superscript)
#0x2122 => 'unicode discouraged', # TM (superscript)
## inline annotations
0xFFF9 => 'unicode discouraged',
0xFFFA => 'unicode discouraged',
0xFFFB => 'unicode discouraged',
## greek punctuations
0x055A => 'unicode not preferred',
0x0559 => 'unicode not preferred',
## degree signs
0x2103 => 'unicode not preferred',
0x2109 => 'unicode not preferred',
## strongly preferrs U+2060 WORD JOINTER
0xFEFE => 'unicode not preferred',
};
$etypes->{$_} = 'unicode deprecated' for 0xE0020 .. 0xE007F;
$etypes->{$_} = 'nonchar' for 0xFDD0 .. 0xFDEF;
## ISSUE: U+FDE0-U+FDEF are not excluded in HTML5.
$etypes->{$_} = 'unicode should' for 0xFA30 .. 0xFA6A, 0xFA70 .. 0xFAD9;
$etypes->{$_} = 'unicode should' for 0x2F800 .. 0x2FA1D, 0x239B .. 0x23B3;
$etypes->{$_} = 'unicode should'
for 0xFB50 .. 0xFBB1, 0xFBD3 .. 0xFD3D, 0xFD50 .. 0xFD8F,
0xFD92 .. 0xFDC7, 0xFDF0 .. 0xFDFB, 0xFE70 .. 0xFE74,
0xFE76 .. 0xFEFC;
## NOTE: Arabic Presentation Forms-A/B blocks, w/o code points where
## no character is assigned, noncharacter code points, and
## U+FD3E and U+FD3F, which are explicitly allowed.
$etypes->{$_} = 'unicode discouraged' for 0x2153 .. 0x217F;
$etypes->{$_} = 'control char'
for 0x0001 .. 0x0008, 0x000B, 0x000E .. 0x001F, 0x007F .. 0x009F;
#0x0000
#$etypes->{$_} = 'control char' for 0xD800 .. 0xDFFF;
my $check_char = sub ($$) {
my ($self, $char_code) = @_;
## NOTE: Negative $char_code is not supported.
if ($char_code == 0x000D) {
$self->{line_diff}++;
$self->{column_diff} = 0;
$self->{set_column} = 1;
$self->{has_cr} = 1;
return;
} elsif ($char_code == 0x000A) {
if ($self->{has_cr}) {
delete $self->{has_cr};
} else {
$self->{line_diff}++;
$self->{column_diff} = 0;
$self->{set_column} = 1;
}
return;
} else {
$self->{column_diff}++;
delete $self->{has_cr};
}
if ($char_code > 0x10FFFF) {
$self->{onerror}->(type => 'non unicode',
text => (sprintf 'U-%08X', $char_code),
layer => 'charset',
level => $self->{level}->{$self->{level_map}->{'non unicode'}},
line_diff => $self->{line_diff},
column_diff => $self->{column_diff},
($self->{set_column} ? (column => 1) : ()));
if ($self->{replace_non_unicode}) {
return "\x{FFFD}";
} else {
return;
}
}
my $etype = $etypes->{$char_code};
if (defined $etype) {
$self->{onerror}->(type => $etype,
text => (sprintf 'U+%04X', $char_code),
layer => 'charset',
level => $self->{level}->{$self->{level_map}->{$etype}},
line_diff => $self->{line_diff},
column_diff => $self->{column_diff},
($self->{set_column} ? (column => 1) : ()));
}
## TODO: "khanda ta" should be represented by U+09CE
## rather than <U+09A4, U+09CD, U+200D>.
## TODO: IDS syntax
## TODO: langtag syntax
return;
}; # $check_char
sub read ($$$;$) {
my $self = shift;
my $offset = $_[2] || 0;
my $count = $self->{handle}->read (@_);
$self->{line_diff} = 0;
$self->{column_diff} = -1;
delete $self->{set_column};
delete $self->{has_cr};
for ($offset .. ($offset + $count - 1)) {
my $c = $check_char->($self, ord substr $_[0], $_, 1);
if (defined $c) {
substr ($_[0], $_, 1) = $c;
}
}
return $count;
} # read
sub manakai_read_until ($$$;$) {
#my ($self, $scalar, $pattern, $offset) = @_;
my $self = shift;
my $offset = $_[2] || 0;
my $count = $self->{handle}->manakai_read_until (@_);
$self->{line_diff} = 0;
$self->{column_diff} = -1;
delete $self->{set_column};
delete $self->{has_cr};
for ($offset .. ($offset + $count - 1)) {
my $c = $check_char->($self, ord substr $_[0], $_, 1);
if (defined $c) {
substr ($_[0], $_, 1) = $c;
}
}
return $count;
} # manakai_read_until
sub ungetc ($$) {
unshift @{$_[0]->{queue}}, chr int ($_[1] or 0);
} # ungetc
sub close ($) {
shift->{handle}->close;
} # close
sub charset ($) {
shift->{handle}->charset;
} # charset
sub has_bom ($) {
shift->{handle}->has_bom;
} # has_bom
sub input_encoding ($) {
shift->{handle}->input_encoding;
} # input_encoding
sub onerror ($;$) {
if (@_ > 1) {
if (defined $_[1]) {
$_[0]->{handle}->onerror ($_[0]->{onerror} = $_[1]);
$_[0]->{onerror_set} = 1;
} else {
$_[0]->{handle}->onerror ($_[0]->{onerror} = sub {});
delete $_[0]->{onerror_set};
}
}
return $_[0]->{onerror_set} ? $_[0]->{onerror} : undef;
} # onerror
1;
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