/
Callback.pm
460 lines (389 loc) · 16.6 KB
/
Callback.pm
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# Copyright 2012 Jeffrey Kegler
# This file is part of Marpa::R2. Marpa::R2 is free software: you can
# redistribute it and/or modify it under the terms of the GNU Lesser
# General Public License as published by the Free Software Foundation,
# either version 3 of the License, or (at your option) any later version.
#
# Marpa::R2 is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser
# General Public License along with Marpa::R2. If not, see
# http://www.gnu.org/licenses/.
use 5.010;
use warnings;
use strict;
package Marpa::R2::HTML::Callback;
use vars qw( $VERSION $STRING_VERSION );
$VERSION = '2.027_003';
$STRING_VERSION = $VERSION;
## use critic (BuiltinFunctions::ProhibitStringyEval)
$VERSION = eval $VERSION;
## no critic
package Marpa::R2::HTML::Internal::Callback;
use English qw( -no_match_vars );
sub Marpa::R2::HTML::start_tag {
my $parse_instance = $Marpa::R2::HTML::Internal::PARSE_INSTANCE;
Marpa::R2::exception(q{Attempt to fetch start tag outside of a parse})
if not defined $parse_instance;
return undef if not defined $Marpa::R2::HTML::Internal::START_TAG_IX;
return ${
Marpa::R2::HTML::Internal::token_range_to_original(
$parse_instance,
$Marpa::R2::HTML::Internal::START_TAG_IX,
$Marpa::R2::HTML::Internal::START_TAG_IX
)
};
} ## end sub Marpa::R2::HTML::start_tag
# We do not always need the end tag, so it is found lazily,
# unlike the start tag which is determined eagerly.
# Return the end token ix, or undef if none.
# As a side effect set $Marpa::R2::HTML::Internal::END_TAG_IX_REF
# to be a reference to that result
sub end_tag_set {
my $parse_instance = $Marpa::R2::HTML::Internal::PARSE_INSTANCE;
# be idempotent -- but this is probably unnecessary
return ${$Marpa::R2::HTML::Internal::END_TAG_IX_REF}
if defined $Marpa::R2::HTML::Internal::END_TAG_IX_REF;
# default to no end tag
$Marpa::R2::HTML::Internal::END_TAG_IX_REF = \undef;
# return undef if the current rule is not an element
return undef if not $Marpa::R2::HTML::Internal::ELEMENT;
my $arg_n = $Marpa::R2::HTML::Internal::ARG_N;
my $end_tag_tdesc_item = $Marpa::R2::HTML::Internal::STACK->[$arg_n];
my $end_tag_type = $end_tag_tdesc_item->[0];
return undef if not defined $end_tag_type;
return undef if $end_tag_type ne 'PHYSICAL_TOKEN';
my $end_tag_token_ix =
$end_tag_tdesc_item->[Marpa::R2::HTML::Internal::TDesc::END_TOKEN];
my $tokens = $parse_instance->{tokens};
my $html_token = $tokens->[$end_tag_token_ix];
my $html_token_type =
$html_token->[Marpa::R2::HTML::Internal::Token::TYPE];
return undef if $html_token_type ne 'E';
$Marpa::R2::HTML::Internal::END_TAG_IX_REF = \$end_tag_token_ix;
return $end_tag_token_ix;
} ## end sub end_tag_set
sub Marpa::R2::HTML::end_tag {
my $parse_instance = $Marpa::R2::HTML::Internal::PARSE_INSTANCE;
Marpa::R2::exception(q{Attempt to fetch an end tag outside of a parse})
if not defined $parse_instance;
defined $Marpa::R2::HTML::Internal::END_TAG_IX_REF or end_tag_set();
my $end_tag_token_ix = ${$Marpa::R2::HTML::Internal::END_TAG_IX_REF};
return undef if not defined $end_tag_token_ix;
return ${
Marpa::R2::HTML::Internal::token_range_to_original( $parse_instance,
$end_tag_token_ix, $end_tag_token_ix, )
};
} ## end sub Marpa::R2::HTML::end_tag
sub Marpa::R2::HTML::contents {
my $self = $Marpa::R2::HTML::Internal::PARSE_INSTANCE;
Marpa::R2::exception(
q{Attempt to fetch an element contents outside of a parse})
if not defined $self;
return undef if not $Marpa::R2::HTML::Internal::ELEMENT;
my $contents_start_ix =
defined $Marpa::R2::HTML::Internal::START_TAG_IX
? $Marpa::R2::HTML::Internal::START_TAG_IX + 1
: $Marpa::R2::HTML::Internal::START_HTML_TOKEN_IX;
defined $Marpa::R2::HTML::Internal::END_TAG_IX_REF or end_tag_set();
my $end_tag_token_ix = ${$Marpa::R2::HTML::Internal::END_TAG_IX_REF};
my $contents_end_ix =
defined $end_tag_token_ix
? $end_tag_token_ix + 1
: $Marpa::R2::HTML::Internal::END_HTML_TOKEN_IX;
# An element does not necessarily have any tokens
return q{} if not defined $contents_start_ix;
my $content_values = [
@{$Marpa::R2::HTML::Internal::STACK}[
( $Marpa::R2::HTML::Internal::ARG_0 + 1 )
.. ( $Marpa::R2::HTML::Internal::ARG_N - 1 )
]
];
return ${
Marpa::R2::HTML::Internal::range_and_values_to_literal( $self,
$contents_start_ix, $contents_end_ix, $content_values )
};
} ## end sub Marpa::R2::HTML::contents
sub Marpa::R2::HTML::values {
my $parse_instance = $Marpa::R2::HTML::Internal::PARSE_INSTANCE;
Marpa::R2::exception(q{Attempt to examine rule while not in a parse})
if not defined $parse_instance;
my @flat_tdesc_list = ();
STACK_IX:
for my $stack_ix (
$Marpa::R2::HTML::Internal::ARG_0 .. $Marpa::R2::HTML::Internal::ARG_N
)
{
my $tdesc_item = $Marpa::R2::HTML::Internal::STACK->[$stack_ix];
my $type = $tdesc_item->[0];
next STACK_IX if not defined $type;
if ( $type eq 'VALUES' ) {
push @flat_tdesc_list,
@{ $tdesc_item->[Marpa::R2::HTML::Internal::TDesc::VALUE] };
next STACK_IX;
}
if ( $type eq 'VALUED_SPAN' ) {
push @flat_tdesc_list, $tdesc_item;
next STACK_IX;
}
} ## end STACK_IX: for my $stack_ix ( $Marpa::R2::HTML::Internal::ARG_0 ...)
return [ grep {defined}
map { $_->[Marpa::R2::HTML::Internal::TDesc::VALUE] }
@flat_tdesc_list ];
} ## end sub Marpa::R2::HTML::values
sub Marpa::R2::HTML::descendants {
my ($argspecs) = @_;
my $parse_instance = $Marpa::R2::HTML::Internal::PARSE_INSTANCE;
Marpa::R2::exception(q{Attempt to fetch an end tag outside of a parse})
if not defined $parse_instance;
my $tokens = $parse_instance->{tokens};
my @argspecs = ();
for my $argspec ( split /,/xms, $argspecs ) {
$argspec =~ s/\A \s* //xms;
$argspec =~ s/ \s* \z//xms;
push @argspecs, $argspec;
}
my @flat_tdesc_list = ();
STACK_IX:
for my $stack_ix (
$Marpa::R2::HTML::Internal::ARG_0 .. $Marpa::R2::HTML::Internal::ARG_N
)
{
my $tdesc_item = $Marpa::R2::HTML::Internal::STACK->[$stack_ix];
my $type = $tdesc_item->[0];
next STACK_IX if not defined $type;
next STACK_IX if $type eq 'ZERO_SPAN';
next STACK_IX if $type eq 'RUBY_SLIPPERS_TOKEN';
if ( $type eq 'VALUES' ) {
push @flat_tdesc_list,
@{ $tdesc_item->[Marpa::R2::HTML::Internal::TDesc::VALUE] };
next STACK_IX;
}
push @flat_tdesc_list, $tdesc_item;
} ## end STACK_IX: for my $stack_ix ( $Marpa::R2::HTML::Internal::ARG_0 ...)
my $next_token_ix = $Marpa::R2::HTML::Internal::START_HTML_TOKEN_IX;
my $final_token_ix = $Marpa::R2::HTML::Internal::END_HTML_TOKEN_IX;
my @descendants = ();
TDESC_ITEM: for my $tdesc_item (@flat_tdesc_list) {
my ( $tdesc_item_type, $next_explicit_token_ix,
$furthest_explicit_token_ix )
= @{$tdesc_item};
if (not defined $next_explicit_token_ix) {
## An element can contain no HTML tokens -- it may contain
## only Ruby Slippers tokens.
## Treat this as a special case.
if ( $tdesc_item_type eq 'VALUED_SPAN'
and defined $tdesc_item->[Marpa::R2::HTML::Internal::TDesc::VALUE]
)
{
push @descendants, [ 1, $tdesc_item ];
}
next TDESC_ITEM;
}
push @descendants,
map { [ 0, $_ ] }
( $next_token_ix .. $next_explicit_token_ix - 1 );
if ( $tdesc_item_type eq 'VALUED_SPAN'
and defined $tdesc_item->[Marpa::R2::HTML::Internal::TDesc::VALUE]
)
{
push @descendants, [ 1, $tdesc_item ];
$next_token_ix = $furthest_explicit_token_ix + 1;
next TDESC_ITEM;
} ## end if ( $tdesc_item_type eq 'VALUED_SPAN' and defined ...)
push @descendants,
map { [ 0, $_ ] }
( $next_explicit_token_ix .. $furthest_explicit_token_ix );
$next_token_ix = $furthest_explicit_token_ix + 1;
} ## end TDESC_ITEM: for my $tdesc_item (@flat_tdesc_list)
my @results;
DESCENDANT: for my $descendant (@descendants) {
my @per_descendant_results = ();
my ( $is_valued, $data ) = @{$descendant};
ARGSPEC: for my $argspec_ix ( 0 .. $#argspecs ) {
## Work with a copy, so we can change it
my $argspec = $argspecs[$argspec_ix];
my $deref = 1;
if ( $argspec =~ s/_ref\z//xms ) {
$deref = 0;
}
if ( $argspec eq 'literal' ) {
if ($is_valued) {
push @per_descendant_results,
q{}
. $data->[Marpa::R2::HTML::Internal::TDesc::VALUE];
next ARGSPEC;
} ## end if ($is_valued)
$argspec = 'original';
## FALL THROUGH
} ## end if ( $argspec eq 'literal' )
if ( $argspec eq 'value' ) {
my $value =
$is_valued
? $data->[Marpa::R2::HTML::Internal::TDesc::VALUE]
: undef;
push @per_descendant_results, $value;
next ARGSPEC;
} ## end if ( $argspec eq 'value' )
if ( $argspec eq 'original' ) {
my ( $start_ix, $end_ix ) =
$is_valued
? (
@{$data}[
Marpa::R2::HTML::Internal::TDesc::START_TOKEN,
Marpa::R2::HTML::Internal::TDesc::END_TOKEN
]
)
: ( $data, $data );
my $result =
Marpa::R2::HTML::Internal::token_range_to_original(
$parse_instance, $start_ix, $end_ix );
$result = ${$result} if $deref;
push @per_descendant_results, $result;
next ARGSPEC;
} ## end if ( $argspec eq 'original' )
if ( $argspec eq 'token_type' ) {
if ($is_valued) {
push @per_descendant_results, undef;
next ARGSPEC;
}
my $token_ix = $data;
my $html_token = $tokens->[$token_ix];
push @per_descendant_results,
$html_token->[Marpa::R2::HTML::Internal::Token::TYPE];
next ARGSPEC;
} ## end if ( $argspec eq 'token_type' )
if ( $argspec eq 'element' ) {
if ( not $is_valued ) {
push @per_descendant_results, undef;
next ARGSPEC;
}
my $rule_id =
$data->[Marpa::R2::HTML::Internal::TDesc::RULE_ID];
my $action =
$parse_instance->{action_by_rule_id}->[$rule_id];
if ( not defined $action ) {
push @per_descendant_results, undef;
next ARGSPEC;
}
if ( ( index $action, 'ELE_' ) != 0 ) {
push @per_descendant_results, undef;
next ARGSPEC;
}
push @per_descendant_results, ( substr $action, 4 );
next ARGSPEC;
} ## end if ( $argspec eq 'element' )
if ( $argspec eq 'pseudoclass' ) {
## This argspec needs to be better defined/implemented
## As of VERSION 2.021_000 it has been removed
## from the documentation.
if ( not $is_valued ) {
push @per_descendant_results, undef;
next ARGSPEC;
}
my $rule_id =
$data->[Marpa::R2::HTML::Internal::TDesc::RULE_ID];
my $action =
$parse_instance->{action_by_rule_id}->[$rule_id];
if ( not defined $action ) {
push @per_descendant_results, undef;
next ARGSPEC;
}
if ( ( index $action, 'SPE_' ) != 0 ) {
push @per_descendant_results, undef;
next ARGSPEC;
}
push @per_descendant_results, ( substr $action, 4 );
push @per_descendant_results, $action;
next ARGSPEC;
} ## end if ( $argspec eq 'pseudoclass' )
die "Unimplemented argspec: $argspec";
} ## end ARGSPEC: for my $argspec_ix ( 0 .. $#argspecs )
push @results, \@per_descendant_results;
} ## end CHILD: for my $child (@children)
return \@results;
} ## end sub Marpa::R2::HTML::descendants
sub Marpa::R2::HTML::attributes {
return $Marpa::R2::HTML::Internal::ATTRIBUTES // {};
} ## end sub Marpa::R2::HTML::attributes
# This assumes that a start token, if there is one
# with attributes, is the first token
sub create_fetch_attribute_closure {
my ($attribute) = @_;
return sub {
my $attributes = $Marpa::R2::HTML::Internal::ATTRIBUTES;
return undef if not defined $attributes;
return $attributes->{$attribute};
};
} ## end sub create_fetch_attribute_closure
no strict 'refs';
*{'Marpa::R2::HTML::id'} = create_fetch_attribute_closure('id');
*{'Marpa::R2::HTML::class'} = create_fetch_attribute_closure('class');
*{'Marpa::R2::HTML::title'} = create_fetch_attribute_closure('title');
use strict;
package Marpa::R2::HTML::Internal::Callback;
sub Marpa::R2::HTML::tagname {
return $Marpa::R2::HTML::Internal::ELEMENT;
}
sub Marpa::R2::HTML::is_empty_element {
return undef if not defined $Marpa::R2::HTML::Internal::ELEMENT;
my $self = $Marpa::R2::HTML::Internal::PARSE_INSTANCE;
return $self->{is_empty_element}->{$Marpa::R2::HTML::Internal::ELEMENT};
}
sub Marpa::R2::HTML::species {
return $Marpa::R2::HTML::Internal::SPECIES;
}
sub Marpa::R2::HTML::literal_ref {
my $self = $Marpa::R2::HTML::Internal::PARSE_INSTANCE;
Marpa::R2::exception(
q{Attempt to fetch an element contents outside of a parse})
if not defined $self;
my $contents_start_ix = $Marpa::R2::HTML::Internal::START_HTML_TOKEN_IX;
# A rule does not necessarily have any tokens
return \q{} if not defined $contents_start_ix;
my $contents_end_ix = $Marpa::R2::HTML::Internal::END_HTML_TOKEN_IX;
my $content_values = [
@{$Marpa::R2::HTML::Internal::STACK}[
($Marpa::R2::HTML::Internal::ARG_0)
.. ($Marpa::R2::HTML::Internal::ARG_N)
]
];
return Marpa::R2::HTML::Internal::range_and_values_to_literal( $self,
$contents_start_ix, $contents_end_ix, $content_values );
} ## end sub Marpa::R2::HTML::literal_ref
sub Marpa::R2::HTML::literal {
return ${Marpa::R2::HTML::literal_ref()};
} ## end sub Marpa::R2::HTML::literal
sub Marpa::R2::HTML::offset {
my $self = $Marpa::R2::HTML::Internal::PARSE_INSTANCE;
my $start_token_ix = $Marpa::R2::HTML::Internal::START_HTML_TOKEN_IX;
return undef if not defined $start_token_ix;
my $tokens = $self->{tokens};
return $tokens->[$start_token_ix]
->[Marpa::R2::HTML::Internal::Token::START_OFFSET];
} ## end sub Marpa::R2::HTML::offset
sub Marpa::R2::HTML::token_type {
my $self = $Marpa::R2::HTML::Internal::PARSE_INSTANCE;
my $start_token_ix = $Marpa::R2::HTML::Internal::START_HTML_TOKEN_IX;
return undef if not defined $start_token_ix;
my $tokens = $self->{tokens};
return $tokens->[$start_token_ix]
->[Marpa::R2::HTML::Internal::Token::TYPE];
} ## end sub Marpa::R2::HTML::token_type
sub Marpa::R2::HTML::original_ref {
my $self = $Marpa::R2::HTML::Internal::PARSE_INSTANCE;
Marpa::R2::exception(q{Attempt to look at a rule while not in a parse})
if not defined $self;
my $start_token_ix = $Marpa::R2::HTML::Internal::START_HTML_TOKEN_IX;
# An rule does not necessarily have any HTML tokens
return q{} if not defined $start_token_ix;
return Marpa::R2::HTML::Internal::token_range_to_original( $self,
$start_token_ix, $Marpa::R2::HTML::Internal::END_HTML_TOKEN_IX );
} ## end sub Marpa::R2::HTML::original_ref
sub Marpa::R2::HTML::original {
return ${Marpa::R2::HTML::original_ref()};
}
1;