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<?php
// $Id: views_handler_field_math.inc,v 1.1.2.3 2010/11/05 07:20:54 dereine Exp $
/**
* Render a mathematical expression as a numeric value
*
* Definition terms:
* - float: If true this field contains a decimal value. If unset this field
* will be assumed to be integer.
*
* @ingroup views_field_handlers
*/
class views_handler_field_math extends views_handler_field_numeric {
function option_definition() {
$options = parent::option_definition();
$options['expression'] = array('default' => '');
return $options;
}
function options_form(&$form, &$form_state) {
$form['expression'] = array(
'#type' => 'textarea',
'#title' => t('Expression'),
'#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).'),
'#default_value' => $this->options['expression'],
);
// Create a place for the help
$form['expression_help'] = array();
parent::options_form($form, $form_state);
// Then move the existing help:
$form['expression_help'] = $form['alter']['help'];
unset($form['expression_help']['#dependency']);
unset($form['expression_help']['#process']);
unset($form['alter']['help']);
}
function render($values) {
ctools_include('math-expr');
$value = strtr($this->options['expression'], $this->get_render_tokens(array()));
$expressions = explode(';', $value);
$math = new ctools_math_expr;
foreach ($expressions as $expression) {
if ($expression !== '') {
$value = $math->evaluate($expression);
}
}
// The rest is directly from views_handler_field_numeric but because it
// does not allow the value to be passed in, it is copied.
if (!empty($this->options['set_precision'])) {
$value = number_format($value, $this->options['precision'], $this->options['decimal'], $this->options['separator']);
}
else {
$remainder = abs($value) - intval(abs($value));
$value = $value > 0 ? floor($value) : ceil($value);
$value = number_format($value, 0, '', $this->options['separator']);
if ($remainder) {
// The substr may not be locale safe.
$value .= $this->options['decimal'] . substr($remainder, 2);
}
}
// Check to see if hiding should happen before adding prefix and suffix.
if ($this->options['hide_empty'] && empty($value) && ($value !== 0 || $this->options['empty_zero'])) {
return '';
}
return check_plain($this->options['prefix'] . $value . $this->options['suffix']);
}
function query() { }
}