function apachesolr_autocomplete_suggest_word_completion in Apache Solr Autocomplete 7.2

Same name and namespace in other branches

1. 6 apachesolr_autocomplete.module \apachesolr_autocomplete_suggest_word_completion()
2. 7 apachesolr_autocomplete.module \apachesolr_autocomplete_suggest_word_completion()

Helper function that suggests ways to complete partial words.

For example, if $keys = "lea", this might return suggestions like: lean, learn, lease. The suggested terms are returned in order of frequency (most frequent first).

File

./apachesolr_autocomplete.module, line 294

Alters search forms to suggest terms using Apache Solr using AJAX.

Code

function apachesolr_autocomplete_suggest_word_completion($keys, $context) {

  /**
   * Split $keys into two:
   *  $first_part will contain all complete words (delimited by spaces). Can be empty.
   *  $last_part is the (assumed incomplete) last word. If this is empty, don't suggest.
   * Example:
   *  $keys = "learning dis" : $first_part = "learning", $last_part = "dis"
   */
  preg_match('/^(:?(.* |))([^ ]+)$/', $keys, $matches);
  $first_part = @$matches[2];

  // Make sure $last_part contains meaningful characters
  $last_part = preg_replace('/[' . PREG_CLASS_UNICODE_WORD_BOUNDARY . ']+/u', '', @$matches[3]);
  if ($last_part == '') {
    return array();
  }

  // Ask Solr to return facets that begin with $last_part; these will be the suggestions.
  $params = $context['apachesolr_params'];
  $params['facet.prefix'] = $last_part;

  // Get array of themed suggestions.
  $result = apachesolr_autocomplete_suggest($context['solr'], $first_part, $params, $context['suggestions_to_return']);
  if (!$result) {
    return array();
  }

  // Concatenate the original terms with the returned suggestion.
  $tmp = array();
  foreach ($result['suggestions'] as $key => $value) {
    $key = substr($key, 1);
    $value['value'] = $first_part . $value['value'];
    $tmp["*" . $value['value']] = $value;
  }
  return $tmp;
}