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<?php
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/**
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* @file
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* Performs basic mathematical calculations on the imported value.
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*/
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$plugin = array(
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'form' => 'feeds_tamper_math_form',
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'validate' => 'feeds_tamper_math_validate',
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'callback' => 'feeds_tamper_math_callback',
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'name' => 'Mathematical operation',
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'category' => 'Number',
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'multi' => 'loop',
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);
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function feeds_tamper_math_form($importer, $element_key, $settings) {
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$form = array();
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$form['operation'] = array(
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'#type' => 'select',
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'#title' => t('Operation'),
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'#description' => t('The operation to apply to the imported value.'),
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'#required' => TRUE,
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'#options' => array(
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'addition' => '+',
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'subtraction' => '-',
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'multiplication' => '*',
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'division' => '/',
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),
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'#default_value' => isset($settings['operation']) ? $settings['operation'] : '',
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);
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$form['flip'] = array(
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'#type' => 'checkbox',
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'#title' => t('Flip'),
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'#description' => t('Normally, the feed item will be processed like feed-value / setting-value. This option switches the order so that it is setting-value / feed-value.'),
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'#states' => array(
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'visible' => array(
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':input[name="settings[operation]"]' => array(
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array('value' => 'subtraction'),
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array('value' => 'division'),
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),
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),
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),
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'#default_value' => isset($settings['flip']) ? $settings['flip'] : FALSE,
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);
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$form['value'] = array(
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'#type' => 'textfield',
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'#title' => t('Value'),
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'#required' => TRUE,
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'#description' => t('A numerical value.'),
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'#default_value' => isset($settings['value']) ? $settings['value'] : '',
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);
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$form['log'] = array(
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'#type' => 'checkbox',
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'#default_value' => !empty($settings['log']),
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'#title' => t('Log'),
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'#description' => t('Log to the Feed log and print a message when an invalid value is found.'),
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);
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return $form;
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}
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function feeds_tamper_math_validate(&$settings) {
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if (!is_numeric($settings['value'])) {
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form_set_error('settings][value', t('The value must be numeric.'));
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}
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elseif ($settings['operation'] === 'division' && empty($settings['flip']) && $settings['value'] == 0) {
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form_set_error('settings][value', t('Cannot divide by zero.'));
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}
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}
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function feeds_tamper_math_callback($result, $item_key, $element_key, &$field, $settings, $source) {
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if ($field === TRUE || $field === FALSE || $field === NULL) {
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$field = (int) $field;
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}
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if (!is_numeric($field)) {
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if (!empty($settings['log'])) {
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$source->log('feeds_tamper:math', 'Math plugin failed because @key was not numeric. Value: @field', array('@key' => $element_key, '@field' => $field));
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drupal_set_message(t('Math plugin failed because @key was not numeric. Value: @field', array('@key' => $element_key, '@field' => $field)));
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}
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return;
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}
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if (!empty($settings['flip'])) {
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switch ($settings['operation']) {
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case 'subtraction':
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$field = $settings['value'] - $field;
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return;
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case 'division':
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// Avoid divide by zero.
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if (empty($field)) {
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if (!empty($settings['log'])) {
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$source->log('feeds_tamper:math', 'Math plugin failed because @key was zero.', array('@key' => $element_key));
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drupal_set_message(t('Math plugin failed because @key was zero.', array('@key' => $element_key)));
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}
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return;
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}
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$field = $settings['value'] / $field;
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return;
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}
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}
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switch ($settings['operation']) {
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case 'addition':
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$field = $field + $settings['value'];
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return;
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case 'subtraction':
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$field = $field - $settings['value'];
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return;
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case 'multiplication':
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$field = $field * $settings['value'];
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return;
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case 'division':
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$field = $field / $settings['value'];
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return;
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}
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}
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