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| 1 | <?php |
| 2 | |
| 3 | namespace CirrusSearch\Parser; |
| 4 | |
| 5 | use CirrusSearch\Parser\AST\BooleanClause; |
| 6 | use CirrusSearch\Parser\AST\EmptyQueryNode; |
| 7 | use CirrusSearch\Parser\AST\FuzzyNode; |
| 8 | use CirrusSearch\Parser\AST\KeywordFeatureNode; |
| 9 | use CirrusSearch\Parser\AST\NamespaceHeaderNode; |
| 10 | use CirrusSearch\Parser\AST\NegatedNode; |
| 11 | use CirrusSearch\Parser\AST\ParsedBooleanNode; |
| 12 | use CirrusSearch\Parser\AST\ParsedQuery; |
| 13 | use CirrusSearch\Parser\AST\PhrasePrefixNode; |
| 14 | use CirrusSearch\Parser\AST\PhraseQueryNode; |
| 15 | use CirrusSearch\Parser\AST\PrefixNode; |
| 16 | use CirrusSearch\Parser\AST\Visitor\Visitor; |
| 17 | use CirrusSearch\Parser\AST\WildcardNode; |
| 18 | use CirrusSearch\Parser\AST\WordsQueryNode; |
| 19 | |
| 20 | /** |
| 21 | * Basic classifier to identify queries like: |
| 22 | * - simple words: foo bar |
| 23 | * - simple phrase: "foo bar" |
| 24 | * - simple words + simple phrase; foo "bar baz" |
| 25 | * - complex: any queries that use a keyword, or any non trivial features |
| 26 | * - bogus queries: queries where a bogus pattern have been identified at |
| 27 | * parse time |
| 28 | */ |
| 29 | class BasicQueryClassifier implements ParsedQueryClassifier, Visitor { |
| 30 | |
| 31 | /** |
| 32 | * The simplest query ever: only words |
| 33 | */ |
| 34 | public const SIMPLE_BAG_OF_WORDS = 'simple_bag_of_words'; |
| 35 | |
| 36 | /** |
| 37 | * Only quoted words |
| 38 | */ |
| 39 | public const SIMPLE_PHRASE = 'simple_phrase_query'; |
| 40 | |
| 41 | /** |
| 42 | * A simple bag of words query with some quoted words |
| 43 | */ |
| 44 | public const BAG_OF_WORDS_WITH_PHRASE = 'bag_of_words_with_phrase_query'; |
| 45 | |
| 46 | /** |
| 47 | * Expert: a query that uses some special syntax such as: |
| 48 | * - wildcards/fuzzy/word prefix |
| 49 | * - explicit boolean expression |
| 50 | * - complex phrase (phrase prefix, non default slop) |
| 51 | */ |
| 52 | public const COMPLEX_QUERY = 'complex_query'; |
| 53 | |
| 54 | /** |
| 55 | * Query that was fixed/corrected |
| 56 | */ |
| 57 | public const BOGUS_QUERY = 'bogus_query'; |
| 58 | |
| 59 | /** |
| 60 | * @var bool |
| 61 | */ |
| 62 | private $hasWords; |
| 63 | |
| 64 | /** |
| 65 | * @var bool |
| 66 | */ |
| 67 | private $hasSimplePhrase; |
| 68 | |
| 69 | /** |
| 70 | * @var bool |
| 71 | */ |
| 72 | private $hasComplex; |
| 73 | |
| 74 | /** |
| 75 | * @var int |
| 76 | */ |
| 77 | private $depth; |
| 78 | |
| 79 | /** |
| 80 | * @var int |
| 81 | */ |
| 82 | private $maxDepth; |
| 83 | |
| 84 | /** |
| 85 | * @param ParsedQuery $query |
| 86 | * @return string[] |
| 87 | */ |
| 88 | public function classify( ParsedQuery $query ) { |
| 89 | $this->hasWords = false; |
| 90 | $this->hasSimplePhrase = false; |
| 91 | $this->hasComplex = false; |
| 92 | $this->depth = 0; |
| 93 | $this->maxDepth = 0; |
| 94 | |
| 95 | $classes = []; |
| 96 | if ( $query->getParseWarnings() !== [] ) { |
| 97 | $classes[] = self::BOGUS_QUERY; |
| 98 | } |
| 99 | |
| 100 | $query->getRoot()->accept( $this ); |
| 101 | |
| 102 | if ( $this->hasComplex ) { |
| 103 | $classes[] = self::COMPLEX_QUERY; |
| 104 | // @phan-suppress-next-line PhanSuspiciousValueComparison |
| 105 | } elseif ( $this->maxDepth === 0 && $this->hasWords && !$this->hasSimplePhrase ) { |
| 106 | $classes[] = self::SIMPLE_BAG_OF_WORDS; |
| 107 | } elseif ( $this->maxDepth === 0 && !$this->hasWords && $this->hasSimplePhrase ) { |
| 108 | $classes[] = self::SIMPLE_PHRASE; |
| 109 | } elseif ( $this->maxDepth === 1 && $this->hasWords && $this->hasSimplePhrase ) { |
| 110 | $classes[] = self::BAG_OF_WORDS_WITH_PHRASE; |
| 111 | } |
| 112 | |
| 113 | return $classes; |
| 114 | } |
| 115 | |
| 116 | /** |
| 117 | * @param WordsQueryNode $node |
| 118 | */ |
| 119 | public function visitWordsQueryNode( WordsQueryNode $node ) { |
| 120 | $this->hasWords = true; |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * @param PhraseQueryNode $node |
| 125 | */ |
| 126 | public function visitPhraseQueryNode( PhraseQueryNode $node ) { |
| 127 | if ( $node->isStem() || $node->getSlop() !== -1 ) { |
| 128 | $this->hasComplex = true; |
| 129 | } elseif ( !$node->isUnbalanced() ) { |
| 130 | $this->hasSimplePhrase = true; |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * @param PhrasePrefixNode $node |
| 136 | */ |
| 137 | public function visitPhrasePrefixNode( PhrasePrefixNode $node ) { |
| 138 | $this->hasComplex = true; |
| 139 | } |
| 140 | |
| 141 | /** |
| 142 | * @param FuzzyNode $node |
| 143 | */ |
| 144 | public function visitFuzzyNode( FuzzyNode $node ) { |
| 145 | $this->hasComplex = true; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * @param PrefixNode $node |
| 150 | */ |
| 151 | public function visitPrefixNode( PrefixNode $node ) { |
| 152 | $this->hasComplex = true; |
| 153 | } |
| 154 | |
| 155 | /** |
| 156 | * @param WildcardNode $node |
| 157 | */ |
| 158 | public function visitWildcardNode( WildcardNode $node ) { |
| 159 | $this->hasComplex = true; |
| 160 | } |
| 161 | |
| 162 | /** |
| 163 | * @param EmptyQueryNode $node |
| 164 | */ |
| 165 | public function visitEmptyQueryNode( EmptyQueryNode $node ) { |
| 166 | } |
| 167 | |
| 168 | /** |
| 169 | * @param KeywordFeatureNode $node |
| 170 | */ |
| 171 | public function visitKeywordFeatureNode( KeywordFeatureNode $node ) { |
| 172 | $this->hasComplex = true; |
| 173 | } |
| 174 | |
| 175 | /** |
| 176 | * @param ParsedBooleanNode $node |
| 177 | */ |
| 178 | public function visitParsedBooleanNode( ParsedBooleanNode $node ) { |
| 179 | if ( $this->hasComplex ) { |
| 180 | // we can quickly skip, this query cannot belong to this class |
| 181 | return; |
| 182 | } |
| 183 | foreach ( $node->getClauses() as $clause ) { |
| 184 | $clause->accept( $this ); |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * @param BooleanClause $clause |
| 190 | */ |
| 191 | public function visitBooleanClause( BooleanClause $clause ) { |
| 192 | $this->depth++; |
| 193 | $this->maxDepth = max( $this->depth, $this->maxDepth ); |
| 194 | $this->hasComplex = $this->hasComplex || $clause->isExplicit() || $clause->getOccur() === BooleanClause::MUST_NOT; |
| 195 | $clause->getNode()->accept( $this ); |
| 196 | $this->depth--; |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * @param NegatedNode $node |
| 201 | */ |
| 202 | public function visitNegatedNode( NegatedNode $node ) { |
| 203 | $this->hasComplex = true; |
| 204 | } |
| 205 | |
| 206 | /** |
| 207 | * @return string[] |
| 208 | */ |
| 209 | public function classes() { |
| 210 | return [ |
| 211 | self::SIMPLE_BAG_OF_WORDS, |
| 212 | self::SIMPLE_PHRASE, |
| 213 | self::BAG_OF_WORDS_WITH_PHRASE, |
| 214 | self::COMPLEX_QUERY, |
| 215 | self::BOGUS_QUERY, |
| 216 | ]; |
| 217 | } |
| 218 | |
| 219 | /** |
| 220 | * @param NamespaceHeaderNode $node |
| 221 | */ |
| 222 | public function visitNamespaceHeader( NamespaceHeaderNode $node ) { |
| 223 | } |
| 224 | } |