basic_seo_rules.module in SEO Compliance Checker 6

Basic SEO rules for the SEO Checker

File

basic_seo_rules/basic_seo_rules.module

<?php

/**
 * @file
 * Basic SEO rules for the SEO Checker
 */

/**
 * Implementation of hook_register_seo_rules().
 * @return (array) rules
 */
function basic_seo_rules_register_seo_rules() {
  $rules['alt_attributes'] = array(
    'name' => t('Alt attributes in &lt;img&gt; - tags'),
    'description' => t('Checks if all the &lt;img&gt; tags in the body have an alt attribute.'),
    'threshold type' => 'at_least',
    'default threshold' => 100,
    'callback' => 'basic_seo_rules_alt_attribute',
    'passed feedback' => t('Test passed.'),
    'failed feedback' => t('Test failed, please make sure your images contain an alternative text.'),
  );
  $rules['title_attributes'] = array(
    'name' => t('Title attributes in &lt;a href&gt; - tags'),
    'description' => t('Checks if all the &lt;a href&gt; tags have a title attribute.'),
    'threshold type' => 'at_least',
    'default threshold' => 100,
    'callback' => 'basic_seo_rules_title_attribute',
    'passed feedback' => t('Test passed.'),
    'failed feedback' => t('Test failed, please make sure your links contain a title attribute.'),
  );
  return $rules;
}

/********************************* CALLBACKS *********************************/

/**
 * Implements the alt attribute in <img>-tags check.
 * @return (int) result
 * @param array $form_values
 */
function basic_seo_rules_alt_attribute($form_values) {
  $total = 0;
  $successful = 0;
  if (module_exists('content')) {

    /* Fetch image CCK fields for this node type */
    $content_info = content_types($form_values['type']);
    $fields = $content_info['fields'];
    $image_fields = array();

    /* iterate through all the fields */
    foreach ($fields as $field) {
      if ($field['type'] == 'filefield' && $field['widget']['module'] == 'imagefield' && $field['widget']['custom_alt'] == TRUE && is_array($form_values[$field['field_name']])) {

        /* iterate through all the submitted image fields */
        foreach ($form_values[$field['field_name']] as $image) {

          /* only check if an image was submitted */
          if ($image['fid'] != 0) {
            $total++;
            if (!empty($image['data']['alt'])) {
              $successful++;
            }
          }
        }
      }
    }
  }

  /* Check for image_attattach images */
  if (variable_get('image_attach_' . $form_values['type'], FALSE)) {
    $total++;
    if (!empty($form_values['image_title'])) {
      $successful++;
    }
  }
  if (!preg_match_all('/<img[^>]+>/i', $form_values['body'], $matches) && $total == 0) {
    return 100;
  }

  /* check content */
  if (!empty($matches)) {
    foreach ($matches[0] as $image_tag) {
      if (preg_match('/alt=(\\S{3,})/i', $image_tag)) {
        $successful++;
      }
      $total++;
    }
  }
  return 100 * $successful / $total;
}

/**
 * Implements the title attribute in <a href>-tags check.
 * @return (int) result
 * @param array $form_values
 */
function basic_seo_rules_title_attribute($form_values) {
  if (!preg_match_all('/<a[^>]+href[^>]*>/i', $form_values['body'], $matches)) {
    return 100;
  }
  $total = 0;
  $successful = 0;
  foreach ($matches[0] as $ahref_tag) {
    if (preg_match('/title=(\\S{3,})/i', $ahref_tag)) {
      $successful++;
    }
    $total++;
  }
  return 100 * $successful / $total;
}

Functions

Name	Description
basic_seo_rules_alt_attribute	Implements the alt attribute in <img>-tags check.
basic_seo_rules_register_seo_rules	Implementation of hook_register_seo_rules().
basic_seo_rules_title_attribute	Implements the title attribute in <a href>-tags check.