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| 1 | <?php |
| 2 | |
| 3 | namespace CirrusSearch\Search\Fetch; |
| 4 | |
| 5 | use CirrusSearch\SearchConfig; |
| 6 | use CirrusSearch\Searcher; |
| 7 | use Elastica\Query\AbstractQuery; |
| 8 | use Wikimedia\Assert\Assert; |
| 9 | |
| 10 | /** |
| 11 | * Class holding the building state of the fetch phase elements of |
| 12 | * an elasticsearch query. |
| 13 | * Currently only supports the highlight section but can be extended to support |
| 14 | * source filtering and stored field. |
| 15 | */ |
| 16 | class FetchPhaseConfigBuilder implements HighlightFieldGenerator { |
| 17 | |
| 18 | /** @var HighlightedField[] */ |
| 19 | private $highlightedFields = []; |
| 20 | |
| 21 | /** @var SearchConfig */ |
| 22 | private $config; |
| 23 | |
| 24 | /** |
| 25 | * @var string |
| 26 | */ |
| 27 | private $factoryGroup; |
| 28 | |
| 29 | /** |
| 30 | * @var bool |
| 31 | */ |
| 32 | private $provideAllSnippets; |
| 33 | |
| 34 | /** |
| 35 | * @param SearchConfig $config |
| 36 | * @param string|null $factoryGroup |
| 37 | * @param bool $provideAllSnippets |
| 38 | */ |
| 39 | public function __construct( |
| 40 | SearchConfig $config, |
| 41 | $factoryGroup = null, |
| 42 | bool $provideAllSnippets = false |
| 43 | ) { |
| 44 | $this->config = $config; |
| 45 | $this->factoryGroup = $factoryGroup; |
| 46 | $this->provideAllSnippets = $provideAllSnippets; |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * @inheritDoc |
| 51 | */ |
| 52 | public function newHighlightField( |
| 53 | $name, |
| 54 | $target, |
| 55 | $priority = HighlightedField::DEFAULT_TARGET_PRIORITY |
| 56 | ): BaseHighlightedField { |
| 57 | $useExp = $this->config->get( 'CirrusSearchUseExperimentalHighlighter' ); |
| 58 | if ( $useExp ) { |
| 59 | $factories = ExperimentalHighlightedFieldBuilder::getFactories(); |
| 60 | } else { |
| 61 | $factories = BaseHighlightedField::getFactories(); |
| 62 | } |
| 63 | if ( $this->factoryGroup !== null && isset( $factories[$this->factoryGroup][$name] ) ) { |
| 64 | return ( $factories[$this->factoryGroup][$name] )( $this->config, $name, $target, $priority ); |
| 65 | } |
| 66 | if ( $useExp ) { |
| 67 | return new ExperimentalHighlightedFieldBuilder( $name, $target, $priority ); |
| 68 | } else { |
| 69 | return new BaseHighlightedField( $name, BaseHighlightedField::FVH_HL_TYPE, $target, $priority ); |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * @param string $name |
| 75 | * @param string $target |
| 76 | * @param string $pattern |
| 77 | * @param bool $caseInsensitive |
| 78 | * @param int $priority |
| 79 | */ |
| 80 | public function addNewRegexHLField( |
| 81 | $name, |
| 82 | $target, |
| 83 | $pattern, |
| 84 | $caseInsensitive, |
| 85 | $priority = HighlightedField::COSTLY_EXPERT_SYNTAX_PRIORITY |
| 86 | ) { |
| 87 | if ( !$this->supportsRegexFields() ) { |
| 88 | return; |
| 89 | } |
| 90 | $this->addHLField( $this->newRegexField( $name, $target, $pattern, $caseInsensitive, $priority ) ); |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * Whether this builder can generate regex fields |
| 95 | * @return bool |
| 96 | */ |
| 97 | public function supportsRegexFields() { |
| 98 | return (bool)$this->config->get( 'CirrusSearchUseExperimentalHighlighter' ); |
| 99 | } |
| 100 | |
| 101 | /** |
| 102 | * @inheritDoc |
| 103 | */ |
| 104 | public function newRegexField( |
| 105 | $name, |
| 106 | $target, |
| 107 | $pattern, |
| 108 | $caseInsensitive, |
| 109 | $priority = HighlightedField::COSTLY_EXPERT_SYNTAX_PRIORITY |
| 110 | ): BaseHighlightedField { |
| 111 | Assert::precondition( $this->supportsRegexFields(), 'Regex fields not supported' ); |
| 112 | return ExperimentalHighlightedFieldBuilder::newRegexField( |
| 113 | $this->config, $name, $target, $pattern, $caseInsensitive, $priority ); |
| 114 | } |
| 115 | |
| 116 | /** |
| 117 | * @param HighlightedField $field |
| 118 | */ |
| 119 | public function addHLField( HighlightedField $field ) { |
| 120 | $prev = $this->highlightedFields[$field->getFieldName()] ?? null; |
| 121 | if ( $prev === null ) { |
| 122 | $this->highlightedFields[$field->getFieldName()] = $field; |
| 123 | } else { |
| 124 | $this->highlightedFields[$field->getFieldName()] = $prev->merge( $field ); |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * @param string $field |
| 130 | * @return HighlightedField|null |
| 131 | */ |
| 132 | public function getHLField( $field ) { |
| 133 | return $this->highlightedFields[$field] ?? null; |
| 134 | } |
| 135 | |
| 136 | /** |
| 137 | * @param AbstractQuery|null $mainHLQuery |
| 138 | * @return array |
| 139 | */ |
| 140 | public function buildHLConfig( ?AbstractQuery $mainHLQuery = null ): array { |
| 141 | $fields = []; |
| 142 | foreach ( $this->highlightedFields as $field ) { |
| 143 | $arr = $field->toArray(); |
| 144 | if ( $this->provideAllSnippets ) { |
| 145 | $arr = $this->clearSkipIfLastMatched( $arr ); |
| 146 | } |
| 147 | $fields[$field->getFieldName()] = $arr; |
| 148 | } |
| 149 | $config = [ |
| 150 | 'pre_tags' => [ Searcher::HIGHLIGHT_PRE_MARKER ], |
| 151 | 'post_tags' => [ Searcher::HIGHLIGHT_POST_MARKER ], |
| 152 | 'fields' => $fields, |
| 153 | ]; |
| 154 | |
| 155 | if ( $mainHLQuery !== null ) { |
| 156 | $config['highlight_query'] = $mainHLQuery->toArray(); |
| 157 | } |
| 158 | |
| 159 | return $config; |
| 160 | } |
| 161 | |
| 162 | /** |
| 163 | * @param SearchConfig $config |
| 164 | * @return FetchPhaseConfigBuilder |
| 165 | */ |
| 166 | public function withConfig( SearchConfig $config ): self { |
| 167 | return new self( $config, $this->factoryGroup ); |
| 168 | } |
| 169 | |
| 170 | /** |
| 171 | * Return the list of highlighted fields indexed per target |
| 172 | * and ordered by priority (reverse natural order) |
| 173 | * @return HighlightedField[][] |
| 174 | */ |
| 175 | public function getHLFieldsPerTargetAndPriority(): array { |
| 176 | $fields = []; |
| 177 | foreach ( $this->highlightedFields as $f ) { |
| 178 | $fields[$f->getTarget()][] = $f; |
| 179 | } |
| 180 | return array_map( |
| 181 | static function ( array $v ) { |
| 182 | usort( $v, static function ( HighlightedField $g1, HighlightedField $g2 ) { |
| 183 | return $g2->getPriority() <=> $g1->getPriority(); |
| 184 | } ); |
| 185 | return $v; |
| 186 | }, |
| 187 | $fields |
| 188 | ); |
| 189 | } |
| 190 | |
| 191 | public function configureDefaultFullTextFields() { |
| 192 | // TODO: find a better place for this |
| 193 | // Title/redir/category/template |
| 194 | $field = $this->newHighlightField( 'title', HighlightedField::TARGET_TITLE_SNIPPET ); |
| 195 | $this->addHLField( $field ); |
| 196 | $field = $this->newHighlightField( 'redirect.title', HighlightedField::TARGET_REDIRECT_SNIPPET ); |
| 197 | $this->addHLField( $field->skipIfLastMatched() ); |
| 198 | $field = $this->newHighlightField( 'category', HighlightedField::TARGET_CATEGORY_SNIPPET ); |
| 199 | $this->addHLField( $field->skipIfLastMatched() ); |
| 200 | |
| 201 | $field = $this->newHighlightField( 'heading', HighlightedField::TARGET_SECTION_SNIPPET ); |
| 202 | $this->addHLField( $field->skipIfLastMatched() ); |
| 203 | |
| 204 | // content |
| 205 | $field = $this->newHighlightField( 'text', HighlightedField::TARGET_MAIN_SNIPPET ); |
| 206 | $this->addHLField( $field ); |
| 207 | |
| 208 | $field = $this->newHighlightField( 'auxiliary_text', HighlightedField::TARGET_MAIN_SNIPPET ); |
| 209 | $this->addHLField( $field->skipIfLastMatched() ); |
| 210 | |
| 211 | $field = $this->newHighlightField( 'file_text', HighlightedField::TARGET_MAIN_SNIPPET ); |
| 212 | $this->addHLField( $field->skipIfLastMatched() ); |
| 213 | } |
| 214 | |
| 215 | private function clearSkipIfLastMatched( array $arr ) { |
| 216 | unset( $arr['options']['skip_if_last_matched'] ); |
| 217 | if ( empty( $arr['options'] ) ) { |
| 218 | unset( $arr['options'] ); |
| 219 | } |
| 220 | return $arr; |
| 221 | } |
| 222 | } |