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=encoding utf8

=head1 NAME

Lucy::Highlight::Highlighter - Create and highlight excerpts.

=head1 SYNOPSIS

    my $highlighter = Lucy::Highlight::Highlighter->new(
        searcher => $searcher,
        query    => $query,
        field    => 'body'
    );
    my $hits = $searcher->hits( query => $query );
    while ( my $hit = $hits->next ) {
        my $excerpt = $highlighter->create_excerpt($hit);
        ...
    }

=head1 DESCRIPTION

The Highlighter can be used to select relevant snippets from a document,
and to surround search terms with highlighting tags.  It handles both stems
and phrases correctly and efficiently, using special-purpose data generated
at index-time.

=head1 CONSTRUCTORS

=head2 new

    my $highlighter = Lucy::Highlight::Highlighter->new(
        searcher       => $searcher,    # required
        query          => $query,       # required
        field          => 'content',    # required
        excerpt_length => 150,          # default: 200
    );

Create a new Highlighter.

=over

=item *

B<searcher> - An object which inherits from
L<Searcher|Lucy::Search::Searcher>, such as an
L<IndexSearcher|Lucy::Search::IndexSearcher>.

=item *

B<query> - Query object or a query string.

=item *

B<field> - The name of the field from which to draw the excerpt.  The
field must marked as be C<highlightable> (see
L<FieldType|Lucy::Plan::FieldType>).

=item *

B<excerpt_length> - Maximum length of the excerpt, in characters.

=back

=head1 METHODS

=head2 create_excerpt

    my $string = $highlighter->create_excerpt($hit_doc);

Take a HitDoc object and return a highlighted excerpt as a string if
the HitDoc has a value for the specified C<field>.

=head2 encode

    my $string = $highlighter->encode($text);

Encode text with HTML entities. This method is called internally by
L<create_excerpt()|/create_excerpt> for each text fragment when assembling an excerpt.  A
subclass can override this if the text should be encoded differently or
not at all.

=head2 highlight

    my $string = $highlighter->highlight($text);

Highlight a small section of text.  By default, prepends pre-tag and
appends post-tag.  This method is called internally by L<create_excerpt()|/create_excerpt>
when assembling an excerpt.

=head2 set_pre_tag

    $highlighter->set_pre_tag($pre_tag);

Setter.  The default value is “E<lt>strongE<gt>”.

=head2 set_post_tag

    $highlighter->set_post_tag($post_tag);

Setter.  The default value is “E<lt>/strongE<gt>”.

=head2 get_pre_tag

    my $string = $highlighter->get_pre_tag();

Accessor.

=head2 get_post_tag

    my $string = $highlighter->get_post_tag();

Accessor.

=head2 get_field

    my $string = $highlighter->get_field();

Accessor.

=head2 get_excerpt_length

    my $int = $highlighter->get_excerpt_length();

Accessor.

=head2 get_searcher

    my $searcher = $highlighter->get_searcher();

Accessor.

=head2 get_query

    my $query = $highlighter->get_query();

Accessor.

=head2 get_compiler

    my $compiler = $highlighter->get_compiler();

Accessor for the Lucy::Search::Compiler object derived from
C<query> and C<searcher>.

=head1 INHERITANCE

Lucy::Highlight::Highlighter isa Clownfish::Obj.

=cut