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