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   1  <?php
   2  /**
   3   * Render a mathematical expression as a numeric value
   4   *
   5   * Definition terms:
   6   * - float: If true this field contains a decimal value. If unset this field
   7   *          will be assumed to be integer.
   8   *
   9   * @ingroup views_field_handlers
  10   */
  11  class views_handler_field_math extends views_handler_field_numeric {
  12    function option_definition() {
  13      $options = parent::option_definition();
  14      $options['expression'] = array('default' => '');
  15  
  16      return $options;
  17    }
  18  
  19    function options_form(&$form, &$form_state) {
  20      $form['expression'] = array(
  21        '#type' => 'textarea',
  22        '#title' => t('Expression'),
  23        '#description' => t('Enter mathematical expressions such as 2 + 2 or sqrt(5). You my assign variables and create mathematical functions and evaluate them. Use the ; to separate these. For example: f(x) = x + 2; f(2).'),
  24        '#default_value' => $this->options['expression'],
  25      );
  26  
  27      // Create a place for the help
  28      $form['expression_help'] = array();
  29      parent::options_form($form, $form_state);
  30  
  31      // Then move the existing help:
  32      $form['expression_help'] = $form['alter']['help'];
  33      unset($form['expression_help']['#dependency']);
  34      unset($form['expression_help']['#process']);
  35      unset($form['alter']['help']);
  36    }
  37  
  38    function render($values) {
  39      ctools_include('math-expr');
  40      $value = strtr($this->options['expression'], $this->get_render_tokens(array()));
  41      $expressions = explode(';', $value);
  42      $math = new ctools_math_expr;
  43      foreach ($expressions as $expression) {
  44        if ($expression !== '') {
  45          $value = $math->evaluate($expression);
  46        }
  47      }
  48  
  49      // The rest is directly from views_handler_field_numeric but because it
  50      // does not allow the value to be passed in, it is copied.
  51      if (!empty($this->options['set_precision'])) {
  52        $value = number_format($value, $this->options['precision'], $this->options['decimal'], $this->options['separator']);
  53      }
  54      else {
  55        $remainder = abs($value) - intval(abs($value));
  56        $value = $value > 0 ? floor($value) : ceil($value);
  57        $value = number_format($value, 0, '', $this->options['separator']);
  58        if ($remainder) {
  59          // The substr may not be locale safe.
  60          $value .= $this->options['decimal'] . substr($remainder, 2);
  61        }
  62      }
  63  
  64      // Check to see if hiding should happen before adding prefix and suffix.
  65      if ($this->options['hide_empty'] && empty($value) && ($value !== 0 || $this->options['empty_zero'])) {
  66        return '';
  67      }
  68  
  69      return check_plain($this->options['prefix'] . $value . $this->options['suffix']);
  70    }
  71  
  72    function query() { }
  73  }