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wakaba |
1.1 |
package Whatpm::CSS::MediaQueryParser; |
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use strict; |
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our $VERSION=do{my @r=(q$Revision: 1.10 $=~/\d+/g);sprintf "%d."."%02d" x $#r,@r}; |
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use Whatpm::CSS::Tokenizer qw(:token); |
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sub new ($) { |
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my $self = bless {onerror => sub { }, |
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must_level => 'm', unsupported_level => 'u'}, shift; |
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#$self->{href} = \(uri in which the MQ appears); |
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return $self; |
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} # new |
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sub parse_char_string ($$) { |
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my $self = $_[0]; |
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my $s = $_[1]; |
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pos ($s) = 0; |
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my $tt = Whatpm::CSS::Tokenizer->new; |
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$tt->{onerror} = $self->{onerror}; |
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$tt->{line} = 1; |
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$tt->{column} = 1; |
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$tt->{get_char} = sub { |
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if (pos $s < length $s) { |
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$tt->{column} = 1 + pos $s; |
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return ord substr $s, pos ($s)++, 1; |
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} else { |
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return -1; |
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} |
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}; # $tt->{get_char} |
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$tt->init; |
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my $t = $tt->get_next_token; |
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$t = $tt->get_next_token while $t->{type} == S_TOKEN; |
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my $r; |
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($t, $r) = $self->_parse_mq_with_tokenizer ($t, $tt); |
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return undef unless defined $r; |
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if ($t->{type} != EOF_TOKEN) { |
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$self->{onerror}->(type => 'mq syntax error', |
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level => $self->{must_level}, |
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uri => \$self->{href}, |
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token => $t); |
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return undef; |
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} |
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return $r; |
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} # parse_char_string |
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sub _parse_mq_with_tokenizer ($$$) { |
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my ($self, $t, $tt) = @_; |
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my $r = []; |
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A: { |
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## NOTE: Unknown media types are converted into 'unknown', since |
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## Opera and WinIE do so and our implementation of the CSS |
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## tokenizer currently normalizes numbers in NUMBER or DIMENSION tokens |
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## so that the original representation cannot be preserved (e.g. '03d' |
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## is covnerted to '3' with unit 'd'). |
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if ($t->{type} == IDENT_TOKEN) { |
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my $type = lc $t->{value}; ## TODO: case |
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if ({ |
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all => 1, braille => 1, embossed => 1, handheld => 1, print => 1, |
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projection => 1, screen => 1, tty => 1, tv => 1, |
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speech => 1, aural => 1, |
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'atsc-tv' => 1, 'dde-tv' => 1, 'dvb-tv' => 1, |
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dark => 1, emacs => 1, light => 1, xemacs => 1, |
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}->{$type}) { |
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push @$r, [['#type', $type]]; |
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} else { |
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push @$r, [['#type', 'unknown']]; |
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$self->{onerror}->(type => 'unknown media type', |
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level => $self->{unsupported_level}, |
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uri => \$self->{href}, |
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token => $t); |
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} |
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$t = $tt->get_next_token; |
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} elsif ($t->{type} == NUMBER_TOKEN or $t->{type} == DIMENSION_TOKEN) { |
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push @$r, [['#type', 'unknown']]; |
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$self->{onerror}->(type => 'unknown media type', |
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level => $self->{unsupported_level}, |
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uri => \$self->{href}, |
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token => $t); |
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$t = $tt->get_next_token; |
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} else { |
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$self->{onerror}->(type => 'mq syntax error', |
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level => $self->{must_level}, |
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uri => \$self->{href}, |
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token => $t); |
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return ($t, undef); |
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} |
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$t = $tt->get_next_token while $t->{type} == S_TOKEN; |
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if ($t->{type} == COMMA_TOKEN) { |
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$t = $tt->get_next_token; |
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$t = $tt->get_next_token while $t->{type} == S_TOKEN; |
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redo A; |
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} |
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} # A |
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return ($t, $r); |
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} # _parse_mq_with_tokenizer |
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1; |
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