danielebarchiesi@0: <?php
danielebarchiesi@0: 
danielebarchiesi@0: /**
danielebarchiesi@0:  * @file
danielebarchiesi@0:  * Definition of views_handler_field_math.
danielebarchiesi@0:  */
danielebarchiesi@0: 
danielebarchiesi@0: /**
danielebarchiesi@0:  * Render a mathematical expression as a numeric value
danielebarchiesi@0:  *
danielebarchiesi@0:  * Definition terms:
danielebarchiesi@0:  * - float: If true this field contains a decimal value. If unset this field
danielebarchiesi@0:  *   will be assumed to be integer.
danielebarchiesi@0:  *
danielebarchiesi@0:  * @ingroup views_field_handlers
danielebarchiesi@0:  */
danielebarchiesi@0: class views_handler_field_math extends views_handler_field_numeric {
danielebarchiesi@0:   function option_definition() {
danielebarchiesi@0:     $options = parent::option_definition();
danielebarchiesi@0:     $options['expression'] = array('default' => '');
danielebarchiesi@0: 
danielebarchiesi@0:     return $options;
danielebarchiesi@0:   }
danielebarchiesi@0: 
danielebarchiesi@0:   function options_form(&$form, &$form_state) {
danielebarchiesi@0:     $form['expression'] = array(
danielebarchiesi@0:       '#type' => 'textarea',
danielebarchiesi@0:       '#title' => t('Expression'),
danielebarchiesi@0:       '#description' => t('Enter mathematical expressions such as 2 + 2 or sqrt(5). You may assign variables and create mathematical functions and evaluate them. Use the ; to separate these. For example: f(x) = x + 2; f(2).'),
danielebarchiesi@0:       '#default_value' => $this->options['expression'],
danielebarchiesi@0:     );
danielebarchiesi@0: 
danielebarchiesi@0:     // Create a place for the help
danielebarchiesi@0:     $form['expression_help'] = array();
danielebarchiesi@0:     parent::options_form($form, $form_state);
danielebarchiesi@0: 
danielebarchiesi@0:     // Then move the existing help:
danielebarchiesi@0:     $form['expression_help'] = $form['alter']['help'];
danielebarchiesi@0:     unset($form['expression_help']['#dependency']);
danielebarchiesi@0:     unset($form['alter']['help']);
danielebarchiesi@0:   }
danielebarchiesi@0: 
danielebarchiesi@0:   function render($values) {
danielebarchiesi@0:     ctools_include('math-expr');
danielebarchiesi@0:     $tokens = array_map('floatval', $this->get_render_tokens(array()));
danielebarchiesi@0:     $value = strtr($this->options['expression'], $tokens);
danielebarchiesi@0:     $expressions = explode(';', $value);
danielebarchiesi@0:     $math = new ctools_math_expr;
danielebarchiesi@0:     foreach ($expressions as $expression) {
danielebarchiesi@0:       if ($expression !== '') {
danielebarchiesi@0:         $value = $math->evaluate($expression);
danielebarchiesi@0:       }
danielebarchiesi@0:     }
danielebarchiesi@0: 
danielebarchiesi@0:     // The rest is directly from views_handler_field_numeric but because it
danielebarchiesi@0:     // does not allow the value to be passed in, it is copied.
danielebarchiesi@0:     if (!empty($this->options['set_precision'])) {
danielebarchiesi@0:       $value = number_format($value, $this->options['precision'], $this->options['decimal'], $this->options['separator']);
danielebarchiesi@0:     }
danielebarchiesi@0:     else {
danielebarchiesi@0:       $remainder = abs($value) - intval(abs($value));
danielebarchiesi@0:       $value = $value > 0 ? floor($value) : ceil($value);
danielebarchiesi@0:       $value = number_format($value, 0, '', $this->options['separator']);
danielebarchiesi@0:       if ($remainder) {
danielebarchiesi@0:         // The substr may not be locale safe.
danielebarchiesi@0:         $value .= $this->options['decimal'] . substr($remainder, 2);
danielebarchiesi@0:       }
danielebarchiesi@0:     }
danielebarchiesi@0: 
danielebarchiesi@0:     // Check to see if hiding should happen before adding prefix and suffix.
danielebarchiesi@0:     if ($this->options['hide_empty'] && empty($value) && ($value !== 0 || $this->options['empty_zero'])) {
danielebarchiesi@0:       return '';
danielebarchiesi@0:     }
danielebarchiesi@0: 
danielebarchiesi@0:     // Should we format as a plural.
danielebarchiesi@0:     if (!empty($this->options['format_plural']) && ($value != 0 || !$this->options['empty_zero'])) {
danielebarchiesi@0:       $value = format_plural($value, $this->options['format_plural_singular'], $this->options['format_plural_plural']);
danielebarchiesi@0:     }
danielebarchiesi@0: 
danielebarchiesi@0:     return $this->sanitize_value($this->options['prefix'] . $value . $this->options['suffix']);
danielebarchiesi@0:   }
danielebarchiesi@0: 
danielebarchiesi@0:   function query() { }
danielebarchiesi@0: }