post-type-discovery-1.php

<?php

    if($this->get('content')) {
      // If the post has a "content" property with a non-empty value, use its first non-empty value as the content
      $content = $this->get('content');
    } else if($this->get('summary')) {
      // Else if the post has a "summary" property with a non-empty value, use its first non-empty value as the content
      $content = $this->get('summary');
    } else {
      // Else it is a note post
      return 'note';
    }

    // If the post has no "name" property, or has a "name" property with an empty string value (or no value), then it is a note post.
    if(!$this->get('name')) {
      return 'note';
    }

    // Take the first value of the "name" property
    $name = $this->get('name');
    if(is_array($name))
      $name = $name[0];

    // Trim all leading/trailing whitespace
    $name = trim($name);

    // Collapse all sequences of internal whitespace to a single space (0x20) character each
    $name = preg_replace('/\s+/', ' ', $name);

    // Do the same with the first value of the "content" property
    if(is_array($content))
      $content = $content[0];
    $content = trim($content);
    $content = preg_replace('/\s+/m', ' ', $content);

    // If this processed "name" property value is NOT a prefix of the processed "content" property, then it is an article post.
    if(strpos($content, $name) === false) {
      return 'article';
    }

    return 'note';