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package DBIx::TextIndex::QueryParser; |
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use strict; |
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use warnings; |
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1959
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our $VERSION = '0.26'; |
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use base qw(DBIx::TextIndex); |
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use DBIx::TextIndex::Exception; |
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use Text::Balanced qw(extract_bracketed extract_delimited); |
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218553
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my $QRY = 'DBIx::TextIndex::Exception::Query'; |
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sub new { |
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my $pkg = shift; |
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my $class = ref($pkg) || $pkg; |
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my $self = bless {}, $class; |
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my $args = shift || {}; |
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foreach my $field (keys %$args) { |
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$self->{uc($field)} = $args->{$field}; |
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} |
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return $self; |
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} |
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sub term_fields { |
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my $self = shift; |
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return sort { $a cmp $b } keys %{$self->{TERM_FIELDS}}; |
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} |
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sub parse { |
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my $self = shift; |
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delete($self->{TERM_FIELDS}); |
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delete($self->{STOPLISTED_QUERY}); |
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$self->_parse(@_); |
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} |
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sub _parse { |
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my $self = shift; |
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my $q = shift; |
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my @clauses; |
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my $term; |
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$q =~ s/\s+$//; |
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while ($q) { |
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my $clause; |
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if ($q =~ s/^\s+//) { |
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next; |
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} |
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if ($q =~ s/^(AND|OR|\&\&|\|\|)\s+//) { |
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$clause->{CONJ} = $1; |
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$clause->{CONJ} = 'AND' if $clause->{CONJ} eq '&&'; |
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$clause->{CONJ} = 'OR' if $clause->{CONJ} eq '||'; |
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} |
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if ($q =~ s/^\+//) { |
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$clause->{MODIFIER} = 'AND'; |
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} elsif ($q =~ s/^(-|NOT|!)\s*//) { |
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$clause->{MODIFIER} = 'NOT'; |
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} else { |
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$clause->{MODIFIER} = 'OR'; |
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} |
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if ($q =~ s/^(\w+)://) { |
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$clause->{FIELD} = $1; |
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$self->{TERM_FIELDS}->{$clause->{FIELD}}++; |
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} else { |
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$self->{TERM_FIELDS}->{__DEFAULT}++; |
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} |
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if ($q =~ m/^\(/) { |
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my ($extract, $remain) = extract_bracketed($q, "("); |
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unless ($extract) { |
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# FIXME: hard coded error message |
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throw $QRY( error => 'Open and close parentheses are uneven.'); |
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} |
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$q = $remain; |
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$extract =~ s/^\(//; |
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$extract =~ s/\)$//; |
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$clause->{TYPE} = 'QUERY'; |
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$clause->{QUERY} = $self->_parse($extract); |
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} elsif ($q =~ m/^\"/) { |
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my ($extract, $remain) = extract_delimited($q, '"'); |
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unless ($extract) { |
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# FIXME: hard coded error message |
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throw $QRY( error => 'Quotes must be used in matching pairs.') |
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} |
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$q = $remain; |
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$extract =~ s/^\"//; |
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$extract =~ s/\"$//; |
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$clause->{TYPE} = 'PHRASE'; |
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$term = $extract; |
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$clause->{PHRASETERMS} = $self->_parse($extract); |
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if ($q =~ s/^~(\d+)//) { |
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$clause->{PROXIMITY} = $1; |
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} else { |
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$clause->{PROXIMITY} = 1; |
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} |
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} elsif ($q =~ s/^(\S+(?:[\+\-\&\.\@\']|\\\*)\S+)//) { |
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$clause->{TYPE} = 'IMPLICITPHRASE'; |
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$term = $1; |
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$term =~ s:\\\*:\*:g; |
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$clause->{PHRASETERMS} = |
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$self->_parse(join(' ', split('[\+\-\&\.\@\'\*]',$term))); # FIXME: check for double characters, which would cause empty phrase terms |
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} elsif ($q =~ s/^(\S+)\+//) { |
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$clause->{TYPE} = 'PLURAL'; |
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$term = $1; |
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} else { |
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$q =~ s/(\S+)//; |
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my $t = $1; |
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if ($t =~ m/[\?\*]/) { |
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$clause->{TYPE} = 'WILD'; |
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} else { |
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$clause->{TYPE} = 'TERM'; |
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} |
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$term = $t; |
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} |
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$clause->{TERM} = $self->_lc_and_unac($term) if $term; |
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if ($clause->{TERM}) { |
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next unless $clause->{TERM} =~ m/[a-z0-9]/; |
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next if $self->_stoplisted($clause->{TERM}); |
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} |
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0
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push @clauses, $clause; |
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} |
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my $folded = fold_nested_phrases(\@clauses); |
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return $folded; |
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} |
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sub fold_nested_phrases { |
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my $clauses = shift; |
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my @folded; |
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foreach my $clause (@$clauses) { |
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if ($clause->{TYPE} eq 'PHRASE' || |
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$clause->{TYPE} eq 'IMPLICITPHRASE') { |
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my @folded_terms; |
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foreach my $phraseterm (@{$clause->{PHRASETERMS}}) { |
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if ($phraseterm->{TYPE} eq 'IMPLICITPHRASE') { |
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push @folded_terms, |
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fold_nested_phrases($phraseterm->{PHRASETERMS}); |
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} else { |
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push @folded_terms, $phraseterm; |
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} |
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} |
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$clause->{PHRASETERMS} = \@folded_terms; |
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} |
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push @folded, $clause; |
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} |
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return wantarray ? @folded : \@folded; |
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} |
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154
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sub stoplisted_query { |
155
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0
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0
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1
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my $self = shift; |
156
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0
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0
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return ref $self->{STOPLISTED_QUERY} eq 'ARRAY' ? |
157
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$self->{STOPLISTED_QUERY} : []; |
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} |
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1; |
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__END__ |