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.\" ========================================================================
.\"
.IX Title "Lucy::Search::Matcher 3pm"
.TH Lucy::Search::Matcher 3pm "2017-08-02" "perl v5.26.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
Lucy::Search::Matcher \- Match a set of document ids.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    # abstract base class
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
A Matcher iterates over a set of ascending document ids.  Some Matchers
implement \fIscore()\fR and can assign relevance scores to the docs that they
match.  Other implementations may be match-only.
.SH "CONSTRUCTORS"
.IX Header "CONSTRUCTORS"
.SS "\fInew()\fP"
.IX Subsection "new()"
.Vb 1
\&    my $matcher = MyMatcher\->SUPER::new;
.Ve
.PP
Abstract constructor.
.SH "ABSTRACT METHODS"
.IX Header "ABSTRACT METHODS"
.SS "\fInext()\fP"
.IX Subsection "next()"
Proceed to the next doc id.
.PP
Returns: A positive doc id, or 0 once the iterator is exhausted.
.SS "\fIget_doc_id()\fP"
.IX Subsection "get_doc_id()"
Return the current doc id.  Valid only after a successful call to
\&\fInext()\fR or \fIadvance()\fR and must not be called otherwise.
.SS "\fIscore()\fP"
.IX Subsection "score()"
Return the score of the current document.
.PP
Only Matchers which are used for scored search need implement \fIscore()\fR.
.SH "METHODS"
.IX Header "METHODS"
.SS "advance(target)"
.IX Subsection "advance(target)"
Advance the iterator to the first doc id greater than or equal to
\&\f(CW\*(C`target\*(C'\fR. The default implementation simply calls \fInext()\fR
over and over, but subclasses have the option of doing something more
efficient.
.IP "\(bu" 4
\&\fBtarget\fR \- A positive doc id, which must be greater than the current
doc id once the iterator has been initialized.
.PP
Returns: A positive doc id, or 0 once the iterator is exhausted.
.SH "INHERITANCE"
.IX Header "INHERITANCE"
Lucy::Search::Matcher isa Lucy::Object::Obj.