1 | <?php |
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2 | |
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3 | /** |
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4 | * @file |
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5 | * Filter classes. |
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6 | * |
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7 | * These classes are always used together, so we keep them in the same file. |
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8 | */ |
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9 | |
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10 | /** |
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11 | * Generic views handler filter to add code to manipulate the query object. |
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12 | */ |
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13 | class views_or_handler_filter extends views_handler_filter { |
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14 | // Don't display empty space where the operator would be. |
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15 | var $no_operator = TRUE; |
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16 | |
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17 | function options_form(&$form, &$form_state) { |
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18 | $form['relationship']['#access'] = FALSE; |
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19 | } |
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20 | |
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21 | /** |
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22 | * Create a new array on the object to store data, and return a referrence to |
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23 | * it. |
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24 | */ |
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25 | function &query_new_alternative() { |
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26 | if (empty($this->query->views_or)) { |
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27 | $this->query->views_or = array(); |
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28 | $id = 0; |
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29 | } |
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30 | else { |
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31 | $id = max(array_keys($this->query->views_or)) + 1; |
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32 | } |
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33 | $this->query->views_or[$id] = array(); |
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34 | return $this->query->views_or[$id]; |
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35 | } |
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36 | |
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37 | /** |
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38 | * Return the current alternative block. |
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39 | */ |
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40 | function &query_current_alternative() { |
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41 | if (empty($this->query->views_or)) { |
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42 | return $this->query_new_alternative(); |
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43 | } |
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44 | return $this->query->views_or[max(array_keys($this->query->views_or))]; |
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45 | } |
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46 | |
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47 | /** |
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48 | * Pop the current alternative block. |
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49 | */ |
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50 | function query_pop_alternative() { |
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51 | unset($this->query->views_or[max(array_keys($this->query->views_or))]); |
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52 | } |
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53 | |
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54 | /** |
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55 | * Return the data structure from a given group. |
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56 | */ |
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57 | function query_get_where_group($group) { |
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58 | if (isset($this->query->where[$group])) { |
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59 | return $this->query->where[$group]; |
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60 | } |
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61 | } |
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62 | |
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63 | /** |
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64 | * Add a new group, with the given data structure, and return the id of the |
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65 | * group. If $as_default is true, this group becomes the default group and the |
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66 | * id returned is that of the old default group. |
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67 | */ |
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68 | function query_add_where_group($group, $as_default = FALSE) { |
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69 | $new_group = $this->query->set_where_group('AND'); |
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70 | if ($as_default) { |
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71 | $this->query->where[$new_group] = $this->query->where[0]; |
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72 | $this->query->where[0] = $group; |
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73 | } |
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74 | else { |
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75 | $this->query->where[$new_group] = $group; |
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76 | } |
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77 | return $new_group; |
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78 | } |
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79 | |
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80 | /** |
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81 | * Removes a given group. If this is the default group, replace it with a new |
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82 | * empty group. |
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83 | */ |
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84 | function query_remove_where_group($group) { |
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85 | if (isset($this->query->where[$group])) { |
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86 | if ($group == 0) { |
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87 | $group = $this->query->set_where_group('AND'); |
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88 | $this->query->where[0] = $this->query->where[$group]; |
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89 | } |
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90 | unset($this->query->where[$group]); |
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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 | * Compact the query such that there is only one where group. If $full is |
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96 | * TRUE, compacts such that there is only one clause in the group. |
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97 | */ |
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98 | function query_compact($full = FALSE) { |
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99 | if (!empty($this->query->where)) { |
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100 | $new_group = array( |
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101 | 'clauses' => array(), |
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102 | 'args' => array(), |
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103 | 'type' => $this->query->group_operator, |
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104 | ); |
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105 | foreach ($this->query->where as $id => $content) { |
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106 | if (count($content['clauses'])) { |
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107 | if (count($content['clauses']) == 1) { |
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108 | $new_group['clauses'] = array_merge($new_group['clauses'], $content['clauses']); |
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109 | } |
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110 | else { |
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111 | $new_group['clauses'][] = '('. implode(') '. $content['type'] .' (', $content['clauses']) .')'; |
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112 | } |
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113 | $new_group['args'] = array_merge($new_group['args'], $content['args']); |
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114 | } |
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115 | } |
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116 | if ($full && count($new_group['clauses']) > 1) { |
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117 | $new_clause = '('. implode(') '. $new_group['type'] .' (', $new_group['clauses']) .')'; |
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118 | $new_group['clauses'] = array($new_clause); |
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119 | } |
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120 | $this->query->where = array(0 => $new_group); |
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121 | } |
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122 | } |
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123 | |
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124 | /* Finish an alternative. This is called to process the data whenever an |
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125 | * alternative statement finishes (ie. either from the "next alternative" or |
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126 | * "end alternatives" filters). |
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127 | */ |
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128 | function finish_alternative() { |
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129 | $alt = &$this->query_current_alternative(); |
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130 | // Compact the query |
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131 | $this->query_compact(TRUE); |
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132 | // Look for INNER joins in the new tables, and make them LEFT joins + where condition instead |
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133 | $clauses = array(); |
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134 | foreach (array_diff(array_keys($this->query->table_queue), $alt['tables']) as $table) { |
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135 | $alt['tables'][] = $table; |
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136 | $def = $this->query->table_queue[$table]; |
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137 | if (!empty($def['join']) && $def['join']->type == 'INNER') { |
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138 | $this->query->table_queue[$table]['join']->type = 'LEFT'; |
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139 | $field = $def['alias'] .'.'. $def['join']->field; |
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140 | $clauses[] = $field .' IS NOT NULL'; |
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141 | } |
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142 | } |
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143 | if (count($clauses)) { |
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144 | // Add a new group with our clauses |
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145 | $grp = $this->query->set_where_group('AND'); |
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146 | foreach ($clauses as $c) { |
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147 | $this->query->add_where($grp, $c); |
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148 | } |
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149 | // Make sure this will be ANDed, and compact again. The query |
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150 | // has already been compacted, so we know this will work. |
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151 | $old_group_operator = $this->query->group_operator; |
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152 | $this->query->group_operator = 'AND'; |
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153 | $this->query_compact(TRUE); |
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154 | $this->query->group_operator = $old_group_operator; |
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155 | } |
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156 | // Now store it for later |
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157 | $alt['alternatives'][] = $this->query_get_where_group(0); |
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158 | $this->query_remove_where_group(0); |
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159 | } |
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160 | } |
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161 | |
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162 | /** |
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163 | * Filter handler to start a block of alternatives. |
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164 | */ |
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165 | class views_or_handler_filter_begin_alternatives extends views_or_handler_filter { |
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166 | function query() { |
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167 | $this->query_compact(); |
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168 | $alt = &$this->query_new_alternative(); |
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169 | $alt['tables'] = array_keys($this->query->table_queue); |
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170 | $alt['pre'] = $this->query_get_where_group(0); |
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171 | $alt['alternatives'] = array(); |
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172 | $this->query_remove_where_group(0); |
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173 | } |
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174 | } |
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175 | |
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176 | /** |
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177 | * Filter handler to indicate the next block of alternatives |
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178 | */ |
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179 | class views_or_handler_filter_next_alternative extends views_or_handler_filter { |
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180 | function query() { |
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181 | $this->finish_alternative(); |
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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 | * Filter handler to indicate the end of a block of alternatives. |
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187 | */ |
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188 | class views_or_handler_filter_end_alternatives extends views_or_handler_filter { |
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189 | function query() { |
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190 | $this->finish_alternative(); |
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191 | $alt = &$this->query_current_alternative(); |
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192 | $new_group = array( |
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193 | 'clauses' => array(), |
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194 | 'args' => array(), |
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195 | 'type' => 'OR', |
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196 | ); |
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197 | foreach ($alt['alternatives'] as $alternative) { |
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198 | if (empty($alternative['clauses'])) continue; |
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199 | $new_group['clauses'][] = $alternative['clauses'][0]; |
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200 | $new_group['args'] = array_merge($new_group['args'], $alternative['args']); |
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201 | } |
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202 | $old = $this->query_add_where_group($alt['pre'], TRUE); |
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203 | $this->query_remove_where_group($old); |
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204 | if (count($new_group['clauses'])) { |
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205 | $this->query_add_where_group($new_group); |
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206 | } |
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207 | if (!isset($alt['pre'])) { |
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208 | unset($this->query->where[0]); |
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209 | } |
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210 | $this->query_pop_alternative(); |
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211 | } |
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212 | } |
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