public function Solr_Base_Query::filter_extract in Apache Solr Search 5.2

Same name and namespace in other branches

1. 6 Solr_Base_Query.php \Solr_Base_Query::filter_extract()
2. 6.2 Solr_Base_Query.php \Solr_Base_Query::filter_extract()

Extract all uses of one named field from a filter string e.g. 'type:book'

1 call to Solr_Base_Query::filter_extract()

Solr_Base_Query::parse_filters in ./Solr_Base_Query.php

Parse the filter string in $this->filters into $this->fields.

File

./Solr_Base_Query.php, line 8

Class

Solr_Base_Query

Code

public function filter_extract(&$filterstring, $name) {
  $extracted = array();
  $name = preg_quote($name, '/');

  // Range queries.  The "TO" is case-sensitive.
  $patterns[] = '/(^| |-)' . $name . ':([\\[\\{](\\S+) TO (\\S+)[\\]\\}])/';

  // Match quoted values.
  $patterns[] = '/(^| |-)' . $name . ':"([^"]*)"/';

  // Match unquoted values.
  $patterns[] = '/(^| |-)' . $name . ':([^ ]*)/';
  foreach ($patterns as $p) {
    if (preg_match_all($p, $filterstring, $matches, PREG_SET_ORDER)) {

      // Sort matches longest to shortest to avoid accidentally
      // removing a sub-string.
      usort($matches, array(
        $this,
        'filter_extract_cmp',
      ));
      foreach ($matches as $match) {
        $filter = array();
        $filter['#query'] = $match[0];
        $filter['#exclude'] = $match[1] == '-';
        $filter['#value'] = trim($match[2]);

        // Empty values cause Lucene parse errors, so skip them.
        if (strlen($filter['#value'])) {
          if (isset($match[3])) {

            // Extra data for range queries
            $filter['#start'] = $match[3];
            $filter['#end'] = $match[4];
          }
          $extracted[] = $filter;
        }

        // Update the local copy of $filters by removing the match.
        $filterstring = str_replace($match[0], '', $filterstring);
      }
    }
  }
  return $extracted;
}