Add a token for word count on text fields

Temporary solution for the body field:
<?php
/**
* Implements hook_token_info().
*/
function mymodule_token_info() {
$info['tokens']['node']['body-wordcount'] = [
'name' => t('Body field word count'),
'description' => t('The word count for the body field.'),
];

return $info;
}

/**
* Implements hook_tokens().
*/
function mymodule_tokens($type, $tokens, array $data, array $options, BubbleableMetadata $bubbleable_metadata) {
$replacements = [];

// Node tokens.
if ($type == 'node' && !empty($data['node'])) {
$node = $data['node'];
foreach ($tokens as $name => $original) {
switch ($name) {
case 'body-wordcount':
if (isset($node->body->value) && !empty($node->body->value)) {
$text = strip_tags($node->body->value);
$replacements[$original] = str_word_count($text);
}
break;
}
}
}

return $replacements;
}

The wordcount logic itself is simple, the question is how to make a subtoken for text fields?

The Smart Trim has some token logic that could be repurposed to handle what we need.

How about "$fieldname-wordcount"?

A fixed patch, after some local testing.

Related: 📌 Fix tests on 8.x-1.x branch Active