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0
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1 <?php
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2
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3 /**
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4 * @file
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5 * Alters search forms to suggest terms using Apache Solr using AJAX.
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6 * Thanks to:
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7 * robertDouglass who contributed some of the code.
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8 * sch4lly for contributing to D7 version
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9 */
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10
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11 /**
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12 * Implementation of hook_init().
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13 */
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14 function solrsearch_autocomplete_init() {
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15
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16 drupal_add_css( drupal_get_path('module', 'solrsearch_autocomplete') . '/solrsearch_autocomplete.css');
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17
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18 // If using custom JS widget, include files and settings.
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19 if (solrsearch_autocomplete_variable_get_widget() == 'custom') {
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20 // Add custom autocomplete files
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21 drupal_add_js(drupal_get_path('module', 'solrsearch_autocomplete') .'/solrsearch_autocomplete.js');
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22 drupal_add_js(drupal_get_path('module', 'solrsearch_autocomplete') .'/jquery-autocomplete/jquery.autocomplete.js');
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23 drupal_add_css( drupal_get_path('module', 'solrsearch_autocomplete') .'/jquery-autocomplete/jquery.autocomplete.css');
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24 // Specify path to autocomplete handler.
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25 drupal_add_js(array('solrsearch_autocomplete' => array('path' => url('solrsearch_autocomplete'))), 'setting');
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26 }
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27 }
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28
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29 /**
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30 * Implementation of hook_form_FORM_ID_alter().
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31 */
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32 function solrsearch_autocomplete_form_search_form_alter(&$form, $form_state) {
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33
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34 if ($form['module']['#value'] == 'solrsearch_search' || $form['module']['#value'] == 'solrsearch_multisitesearch') {
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35 $element = &$form['basic']['keys'];
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36 solrsearch_autocomplete_do_alter($element);
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37 }
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38 }
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39
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40 /**
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41 * Implementation of hook_form_FORM_ID_alter().
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42 */
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43 function solrsearch_autocomplete_form_solrsearch_search_block_form_alter(&$form, $form_state) {
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44
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45 $element = &$form['solrsearch_search_block_form'];
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46 solrsearch_autocomplete_do_alter($element,"title_s,title,author");
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47 }
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48
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49 /**
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50 * Implementation of hook_form_FORM_ID_alter().
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51 */
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52 function solrsearch_autocomplete_form_solrsearch_search_author_block_form_alter(&$form, $form_state) {
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53
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54 $element = &$form['solrsearch_search_author_block_form'];
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55
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56 solrsearch_autocomplete_do_alter($element,"author");
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57 }
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58
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59 /**
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60 * Implementation of hook_form_FORM_ID_alter().
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61 */
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62 function solrsearch_autocomplete_form_solrsearch_search_title_block_form_alter(&$form, $form_state) {
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63
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64 $element = &$form['solrsearch_search_title_block_form'];
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65
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66 solrsearch_autocomplete_do_alter($element,"title_s,title");
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67 }
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68 /**
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69 * Helper function to do the actual altering of search forms.
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70 *
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71 * @param $element
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72 * The element to alter. Should be passed by reference so that original form
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73 * element will be altered.
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74 * E.g.: solrsearch_autocomplete_do_alter(&$form['xyz'])
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75 */
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76 function solrsearch_autocomplete_do_alter(&$element,$field_name) {
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77
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78 if (solrsearch_autocomplete_variable_get_widget() == 'custom') {
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79 // Create elements if they do not exist.
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80 if (!isset($element['#attributes'])) {
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81 $element['#attributes'] = array();
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82 }
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83 if (!isset($element['#attributes']['class'])) {
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84 $element['#attributes']['class'] = array();
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85 }
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86 array_push($element['#attributes']['class'], 'solrsearch-autocomplete', 'unprocessed','solrsearch-autocomplete.field.'.$field_name);
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87
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88 }
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89 else {
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90 $element['#autocomplete_path'] = 'solrsearch_autocomplete';
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91 }
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92 }
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93
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94 /**
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95 * Implementation of hook_menu().
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96 */
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97 function solrsearch_autocomplete_menu() {
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98 $items = array();
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99
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100 $items['solrsearch_autocomplete'] = array(
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101 'page callback' => 'solrsearch_autocomplete_callback',
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102 'access callback' => 'user_access',
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103 'access arguments' => array('search content'),
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104 'type' => MENU_CALLBACK,
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105 );
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106 return $items;
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107 }
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108
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109 /**
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110 * Callback for url solrsearch_autocomplete/autocomplete.
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111 * @param $keys
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112 * The user-entered query.
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113 */
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114 function solrsearch_autocomplete_callback($keys = '', $field_name='') {
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115
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116
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117 if (solrsearch_autocomplete_variable_get_widget() == 'custom') {
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118 // Keys for custom widget come from $_GET.
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119 $keys = $_GET['query'];
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120 $field_names =$_GET['fieldName'];
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121 }
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122
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123 /*
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124 $res = split("\:",$keys);
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125
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126 if (count($res) == 2){
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127 $keys=$res[1];
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128 $field_name=$res[0];
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129 } else {
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130 $keys=$res[0];
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131 $field_name="";
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132 }
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133 */
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134
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135 $suggestions = array();
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136
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137 foreach (explode(",",$field_names) as $field_name) {
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138
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139 $suggestions = array_merge($suggestions, solrsearch_autocomplete_suggest_word_completion($keys, 5,$field_name));
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140 if (solrsearch_autocomplete_variable_get_suggest_keywords() || solrsearch_autocomplete_variable_get_suggest_spellcheck()) {
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141 $suggestions = array_merge($suggestions, solrsearch_autocomplete_suggest_additional_term($keys, 5,$field_name));
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142
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143 }
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144 }
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145 $result = array();
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146 if (solrsearch_autocomplete_variable_get_widget() == 'custom') {
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147 // Place suggestions into new array for returning as JSON.
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148 foreach ($suggestions as $key => $display) {
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149 $result[] = array(
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150 "key" => substr($key,1),
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151 "display" => $display
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152 );
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153 }
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154 }
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155 else {
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156 foreach ($suggestions as $key => $display) {
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157 $result[substr($key,1)] =$display;
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158 }
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159 }
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160 drupal_json_output($result);
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161 exit();
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162 }
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163
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164 /**
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165 * Implementation of hook_theme().
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166 */
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167 function solrsearch_autocomplete_theme() {
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168 return array(
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169 'solrsearch_autocomplete_highlight' => array(
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170 'file' => 'solrsearch_autocomplete.module',
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171 'arguments' => array(
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172 'keys' => NULL,
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173 'suggestion' => NULL,
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174 'count' => NULL,
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175 ),
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176 ),
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177 'solrsearch_autocomplete_spellcheck' => array(
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178 'file' => 'solrsearch_autocomplete.module',
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179 'arguments' => array(
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180 'suggestion' => NULL,
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181 ),
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182 ),
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183 );
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184 }
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185
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186 /**
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187 * Themes each returned suggestion.
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188 */
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189 function theme_solrsearch_autocomplete_highlight($variables) {
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190 static $first = true;
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191 $html = '';
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192 $html .= '<div class="solrsearch_autocomplete suggestion">';
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193 $html .= '<strong>' . drupal_substr($variables['suggestion'], 0, strlen($variables['keys'])) . '</strong>' . drupal_substr($variables['suggestion'], strlen($variables['keys']));
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194 $html .= '</div>';
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195 if ($variables['count'] && $variables['show_counts']) {
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196 if ($first) {
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197 $html .= "<div class='solrsearch_autocomplete message' style='float:right'>";
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198 $html .= t('!count results', array('!count' => $variables['count']));
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199 $html .= "</div><br style='clear:both'>";
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200 $first = false;
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201 } else {
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202 $html .= "<div class='solrsearch_autocomplete message count'>" . $variables['count'] . "</div><br style='clear:both'>";
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203 }
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204 }
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205 return $html;
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206 }
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207
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208 /**
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209 * Themes the spellchecker's suggestion.
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210 */
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211 function theme_solrsearch_autocomplete_spellcheck($variables) {
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212 return '<span class="solrsearch_autocomplete message">' . t('Did you mean') .':</span> ' . $variables['suggestion'];
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213 }
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214
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215 /**
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216 * Return the basic set of parameters for the Solr query.
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217 *
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218 * @param $suggestions_to_return
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219 * Number of facets to return.
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220 * @return array
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221 */
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222 function solrsearch_autocomplete_basic_params($suggestions_to_return,$facet_name) {
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223 return array(
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224 'facet' => 'true',
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225 'facet.field' => array($facet_name),
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226 // We ask for $suggestions_to_return * 5 facets, because we want
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227 // not-too-frequent terms (will be filtered below). 5 is just my best guess.
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228 'facet.limit' => $suggestions_to_return * 5,
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229 'facet.mincount' => 1,
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230 'start' => 0,
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231 'rows' => 0,
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232 );
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233 }
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234
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235 /**
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236 * Helper function that suggests ways to complete partial words.
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237 *
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238 * For example, if $keys = "learn", this might return suggestions like:
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239 * learn, learning, learner, learnability.
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240 * The suggested terms are returned in order of frequency (most frequent first).
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241 *
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242 */
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243 function solrsearch_autocomplete_suggest_word_completion($keys, $suggestions_to_return = 5, $facet_name="author") {
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244 /**
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245 * Split $keys into two:
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246 * $first_part will contain all complete words (delimited by spaces). Can be empty.
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247 * $last_part is the (assumed incomplete) last word. If this is empty, don't suggest.
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248 * Example:
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249 * $keys = "learning dis" : $first_part = "learning", $last_part = "dis"
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250 */
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251 preg_match('/^(:?(.* |))([^ ]+)$/', $keys, $matches);
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252 $first_part = @$matches[2];
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253 // Make sure $last_part contains meaningful characters
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254 $last_part = preg_replace('/[' . PREG_CLASS_UNICODE_WORD_BOUNDARY . ']+/u', '', @$matches[3]);
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255 if ($last_part == '') {
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256 return array();
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257 }
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258 // Ask Solr to return facets that begin with $last_part; these will be the suggestions.
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259 $params = solrsearch_autocomplete_basic_params($suggestions_to_return,$facet_name);
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260 $params['facet.prefix'] = $last_part;
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261 // Get array of themed suggestions.
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262 $result = solrsearch_autocomplete_suggest($first_part, $params, 'solrsearch_autocomplete_highlight', $keys, $suggestions_to_return);
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263 if ($result && $result['suggestions']) {
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264 return $result['suggestions'];
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265 } else {
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266 return array();
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267 }
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268 }
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269
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270 /**
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271 * Helper function that suggests additional terms to search for.
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272 *
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273 * For example, if $keys = "learn", this might return suggestions like:
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274 * learn student, learn school, learn mathematics.
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275 * The suggested terms are returned in order of frequency (most frequent first).
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276 */
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277 function solrsearch_autocomplete_suggest_additional_term($keys, $suggestions_to_return = 5, $facet_name="author") {
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278 $keys = trim($keys);
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279 $keys = check_plain($keys);
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280 if ($keys == '') {
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281 return array();
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282 }
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283 // Return no suggestions when $keys consists of only word delimiters
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284 if (drupal_strlen(preg_replace('/[' . PREG_CLASS_UNICODE_WORD_BOUNDARY . ']+/u', '', $keys)) < 1) {
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285 return array();
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286 }
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287
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288 // Ask Solr to return facets from the 'spell' field to use as suggestions.
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289 $params = solrsearch_autocomplete_basic_params($suggestions_to_return,$facet_name);
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290
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291 // Initialize arrays
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292 $suggestions = array();
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293 $replacements = array();
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294
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295 // Get array of themed suggestions.
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296 $result = solrsearch_autocomplete_suggest($keys, $params, 'solrsearch_autocomplete_highlight', $keys, $suggestions_to_return);
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297 if ($result && solrsearch_autocomplete_variable_get_suggest_keywords()) {
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298 if (isset($result['suggestions']) && sizeof($result['suggestions'])) {
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299 $suggestions = array_merge($suggestions, $result['suggestions']);
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300 }
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301 }
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302
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303 // Suggest using the spellchecker
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304 if (solrsearch_autocomplete_variable_get_suggest_spellcheck()) {
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305 if (isset($result['response']->spellcheck) && isset($result['response']->spellcheck->suggestions)) {
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306 $spellcheck_suggestions = get_object_vars($result['response']->spellcheck->suggestions);
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307 foreach($spellcheck_suggestions as $word => $value) {
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308 $replacements[$word] = $value->suggestion[0];
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309 }
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310 if (count($replacements)) {
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311 $new_keywords = strtr($keys, $replacements);
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312 if ($new_keywords != $keys) {
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313 // Place spellchecker suggestion before others
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314 $suggestions = array_merge(array('*' . $new_keywords => theme('solrsearch_autocomplete_spellcheck', array('suggestion' => $new_keywords))), $suggestions);
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315 }
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316 }
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317 }
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318 }
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319
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320 return $suggestions;
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321 }
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322
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323
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324 function solrsearch_autocomplete_suggest($keys, $params, $theme_callback, $orig_keys, $suggestions_to_return = 5) {
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325 $matches = array();
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326 $suggestions = array();
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327 $keys = trim($keys);
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328 $show_counts = solrsearch_autocomplete_variable_get_counts();
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329
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330 // We need the keys array to make sure we don't suggest words that are already
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331 // in the search terms.
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332 $keys_array = explode(' ', $keys);
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333 $keys_array = array_filter($keys_array);
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334
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335 // Query Solr for $keys so that suggestions will always return results.
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336 $query = solrsearch_drupal_query($keys);
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337
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338 // This hook allows modules to modify the query and params objects.
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339 drupal_alter('solrsearch_query', $query);
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340 if (!$query) {
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341 return array();
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342 }
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343 solrsearch_search_add_spellcheck_params($query);
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344 foreach ($params as $param => $paramValue) {
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345 $query->addParam($param, $paramValue);
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346 }
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347 solrsearch_search_add_boost_params($query);
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348
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349 // Query Solr
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350 $response = $query->search($keys);
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351 // Loop through requested fields and get suggestions.
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352 foreach ($params['facet.field'] as $field) {
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353 foreach ($response->facet_counts->facet_fields->{$field} as $terms => $count) {
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354
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355
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356
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357 $terms = preg_replace('/[_-]+/', ' ', $terms);
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358 $term=$terms;
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359 if ($term) {
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360
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361 if (isset($matches[$term])) {
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362 $matches[$term] += $count;
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363 }
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364 else {
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365 $matches[$term] = $count;
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366 }
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367 }
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368
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369 }
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370 }
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371
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372 if (sizeof($matches) > 0) {
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373 // Eliminate suggestions that are stopwords or are already in the query.
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374 $matches_clone = $matches;
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375 $stopwords = solrsearch_autocomplete_get_stopwords();
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376 foreach ($matches_clone as $term => $count) {
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377 if ((strlen($term) > 3) && !in_array($term, $stopwords) && !array_search($term, $keys_array)) {
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378 // Longer strings get higher ratings.
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379 #$matches_clone[$term] += strlen($term);
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380 }
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381 else {
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382 unset($matches_clone[$term]);
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383 unset($matches[$term]);
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384 }
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385 }
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386
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387 // Don't suggest terms that are too frequent (in >90% of results).
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388 $max_occurence = $response->response->numFound * 0.90;
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389 foreach ($matches_clone as $match => $count) {
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390 if ($count > $max_occurence) {
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391 unset($matches_clone[$match]);
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392 }
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393 }
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394
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395 // The $count in this array is actually a score. We want the highest ones first.
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396 arsort($matches_clone);
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397
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398 // Shorten the array to the right ones.
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399 $matches_clone = array_slice($matches_clone, 0, $suggestions_to_return, TRUE);
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400
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401 // Add current search as suggestion if results > 0
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402 if ($response->response->numFound > 0 && $keys != '') {
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403 // Add * to array element key to force into a string, else PHP will
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404 // renumber keys that look like numbers on the returned array.
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405 $suggestions['*' . $keys] = theme('solrsearch_autocomplete_highlight', array('keys' => $keys, 'suggestion' => $keys, 'count' => $response->response->numFound, 'show_counts' => $show_counts));
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406 }
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407
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408 // Build suggestions using returned facets
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409 foreach ($matches_clone as $match => $count) {
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410 if ($keys != $match) {
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411 $suggestion = trim($keys . ' ' . $match);
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412 // On cases where there are more than 3 keywords, omit displaying
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413 // the count because of the mm settings in solrconfig.xml
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414 if (substr_count($suggestion, ' ') >= 2) {
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415 $count = 0;
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416 }
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417 if ($suggestion != '') {
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418 // Add * to array element key to force into a string, else PHP will
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419 // renumber keys that look like numbers on the returned array.
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420 $suggestions['*' . $suggestion] = theme('solrsearch_autocomplete_highlight', array('keys' => $orig_keys, 'suggestion' => $suggestion, 'count' => $count, 'show_counts' => $show_counts));
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421 }
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422 }
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423 }
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424 }
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425
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426 return array(
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427 'suggestions' => $suggestions,
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428 'response' => &$response
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429 );
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430 }
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431
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432 /**
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433 * Gets the current stopwords list configured in Solr.
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434 */
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435 function solrsearch_autocomplete_get_stopwords() {
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436 static $words = array(), $flag = false;
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437 if ($flag) {
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438 return $words;
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439 }
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440 $stopwords_url = "/admin/file/?file=stopwords.txt";
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441 $host = variable_get('solrsearch_host', 'localhost');
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442 $port = variable_get('solrsearch_port', 8983);
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443 $path = variable_get('solrsearch_path', '/solr');
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444 $url = "http://{$host}:{$port}{$path}{$stopwords_url}";
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445 $result = drupal_http_request($url);
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446 if ($result->code != 200) {
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447 return array();
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448 }
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449 $words = array();
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450 foreach (explode("\n", $result->data) as $line) {
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451 if (drupal_substr($line, 0, 1) == "#") {
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452 continue;
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453 }
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454 if ($word = trim($line)) {
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455 $words[] = $word;
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456 }
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457 }
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458 $flag = true;
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459 return $words;
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460 }
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461
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462 /**
|
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463 * Wrapper around variable_get() for variable solrsearch_autocomplete_widget.
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464 */
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|
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465 function solrsearch_autocomplete_variable_get_widget() {
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466 return variable_get('solrsearch_autocomplete_widget', 'custom');
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467 }
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468
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469 /**
|
|
|
470 * Wrapper around variable_get() for variable solrsearch_autocomplete_suggest_keywords.
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|
471 */
|
|
|
472 function solrsearch_autocomplete_variable_get_suggest_keywords() {
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473 return variable_get('solrsearch_autocomplete_suggest_keywords', 1);
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|
|
474 }
|
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475
|
|
|
476 /**
|
|
|
477 * Wrapper around variable_get() for variable solrsearch_autocomplete_suggest_spellcheck.
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|
|
478 */
|
|
|
479 function solrsearch_autocomplete_variable_get_suggest_spellcheck() {
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|
|
480 return variable_get('solrsearch_autocomplete_suggest_spellcheck', 1);
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|
|
481 }
|
|
|
482
|
|
|
483 /**
|
|
|
484 * Wrapper around variable_get() for variable solrsearch_autocomplete_counts.
|
|
|
485 */
|
|
|
486 function solrsearch_autocomplete_variable_get_counts() {
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|
|
487 return variable_get('solrsearch_autocomplete_counts', TRUE);
|
|
|
488 }
|
|
|
489
|
|
|
490 /**
|
|
|
491 * Alter the solrsearch.module "advanced settings" form.
|
|
|
492 */
|
|
|
493 function solrsearch_autocomplete_form_solrsearch_settings_alter(&$form, $form_state) {
|
|
|
494 $form['advanced']['solrsearch_autocomplete_widget'] = array(
|
|
|
495 '#type' => 'radios',
|
|
|
496 '#title' => t('Autocomplete widget to use'),
|
|
|
497 '#description' => t('The custom widget provides instant search upon selection, whereas the Drupal widget needs the user to hit Enter or click on the Search button. If you are having problems, try switching to the default Drupal autocomplete widget.'),
|
|
|
498 '#options' => array('custom' => t('Custom autocomplete widget'), 'drupal' => t('Drupal core autocomplete widget')),
|
|
|
499 '#default_value' => solrsearch_autocomplete_variable_get_widget(),
|
|
|
500 );
|
|
|
501 $form['advanced']['solrsearch_autocomplete_suggest_keywords'] = array(
|
|
|
502 '#type' => 'checkbox',
|
|
|
503 '#title' => t('Enable additional keyword suggestions on the autocomplete widget'),
|
|
|
504 '#description' => t('Suggest words to add to the currently typed-in words. E.g.: typing "blue" might suggest "blue bike" or "blue shirt".'),
|
|
|
505 '#default_value' => solrsearch_autocomplete_variable_get_suggest_keywords(),
|
|
|
506 );
|
|
|
507 $form['advanced']['solrsearch_autocomplete_suggest_spellcheck'] = array(
|
|
|
508 '#type' => 'checkbox',
|
|
|
509 '#title' => t('Enable spellchecker suggestions on the autocomplete widget'),
|
|
|
510 '#description' => t('Suggest corrections to the currently typed-in words. E.g.: typing "rec" or "redd" might suggest "red".'),
|
|
|
511 '#default_value' => solrsearch_autocomplete_variable_get_suggest_spellcheck(),
|
|
|
512 );
|
|
|
513 $form['advanced']['solrsearch_autocomplete_counts'] = array(
|
|
|
514 '#type' => 'checkbox',
|
|
|
515 '#title' => t('Enable counts in autocomplete widget suggestions'),
|
|
|
516 '#description' => t('WARNING: Counts shown alongside suggestions might be lower than the actual result count due to stemming and minimum match (mm) settings in solrconfig.xml.'),
|
|
|
517 '#default_value' => solrsearch_autocomplete_variable_get_counts(),
|
|
|
518 );
|
|
|
519 }
|
