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<?php
/**
* Server-side rendering of the `core/post-time-to-read` block.
*
* @package WordPress
*/
/**
* Counts words or characters in a provided text string.
*
* This function currently employs an array of regular expressions
* to parse HTML and count words, which may result in inaccurate
* word counts. However, it is designed primarily to agree with the
* corresponding JavaScript function.
*
* Any improvements in the word counting, for example with the HTML API
* and {@see \IntlBreakIterator::createWordInstance()} should coordinate
* with changes to the JavaScript implementation to ensure consistency
* between the editor and the rendered page.
*
* @since 6.9.0
*
* @param string $text Text to count elements in.
* @param string $type The type of count. Accepts 'words', 'characters_excluding_spaces', or 'characters_including_spaces'.
*
* @return string The rendered word count.
*/
function block_core_post_time_to_read_word_count( $text, $type ) {
$settings = array(
'html_regexp' => '/<\/?[a-z][^>]*?>/i',
'html_comment_regexp' => '/<!--[\s\S]*?-->/',
'space_regexp' => '/ | /i',
'html_entity_regexp' => '/&\S+?;/',
'connector_regexp' => "/--|\x{2014}/u",
'remove_regexp' => "/[\x{0021}-\x{0040}\x{005B}-\x{0060}\x{007B}-\x{007E}\x{0080}-\x{00BF}\x{00D7}\x{00F7}\x{2000}-\x{2BFF}\x{2E00}-\x{2E7F}]/u",
'astral_regexp' => "/[\x{010000}-\x{10FFFF}]/u",
'words_regexp' => '/\S\s+/u',
'characters_excluding_spaces_regexp' => '/\S/u',
'characters_including_spaces_regexp' => "/[^\f\n\r\t\v\x{00AD}\x{2028}\x{2029}]/u",
);
$count = 0;
if ( '' === trim( $text ) ) {
return $count;
}
// Sanitize type to one of three possibilities: 'words', 'characters_excluding_spaces' or 'characters_including_spaces'.
if ( 'characters_excluding_spaces' !== $type && 'characters_including_spaces' !== $type ) {
$type = 'words';
}
$text .= "\n";
// Replace all HTML with a new-line.
$text = preg_replace( $settings['html_regexp'], "\n", $text );
// Remove all HTML comments.
$text = preg_replace( $settings['html_comment_regexp'], '', $text );
// If a shortcode regular expression has been provided use it to remove shortcodes.
if ( ! empty( $settings['shortcodes_regexp'] ) ) {
$text = preg_replace( $settings['shortcodes_regexp'], "\n", $text );
}
// Normalize non-breaking space to a normal space.
$text = preg_replace( $settings['space_regexp'], ' ', $text );
if ( 'words' === $type ) {
// Remove HTML Entities.
$text = preg_replace( $settings['html_entity_regexp'], '', $text );
// Convert connectors to spaces to count attached text as words.
$text = preg_replace( $settings['connector_regexp'], ' ', $text );
// Remove unwanted characters.
$text = preg_replace( $settings['remove_regexp'], '', $text );
} else {
// Convert HTML Entities to "a".
$text = preg_replace( $settings['html_entity_regexp'], 'a', $text );
// Remove surrogate points.
$text = preg_replace( $settings['astral_regexp'], 'a', $text );
}
// Match with the selected type regular expression to count the items.
return (int) preg_match_all( $settings[ $type . '_regexp' ], $text );
}
/**
* Renders the `core/post-time-to-read` block on the server.
*
* @since 6.9.0
*
* @param array $attributes Block attributes.
* @param string $content Block default content.
* @param WP_Block $block Block instance.
* @return string Returns the rendered post author name block.
*/
function render_block_core_post_time_to_read( $attributes, $content, $block ) {
if ( ! isset( $block->context['postId'] ) ) {
return '';
}
$content = get_the_content();
$average_reading_rate = $attributes['averageReadingSpeed'] ?? 189;
$display_mode = $attributes['displayMode'] ?? 'time';
$word_count_type = wp_get_word_count_type();
$total_words = block_core_post_time_to_read_word_count( $content, $word_count_type );
$parts = array();
// Add "time to read" part, if enabled.
if ( 'time' === $display_mode ) {
if ( ! empty( $attributes['displayAsRange'] ) ) {
// Calculate faster reading rate with 20% speed = lower minutes,
// and slower reading rate with 20% speed = higher minutes.
$min_minutes = max( 1, (int) round( $total_words / $average_reading_rate * 0.8 ) );
$max_minutes = max( 1, (int) round( $total_words / $average_reading_rate * 1.2 ) );
if ( $min_minutes === $max_minutes ) {
$max_minutes = $min_minutes + 1;
}
/* translators: 1: minimum minutes, 2: maximum minutes to read the post. */
$time_string = sprintf(
/* translators: 1: minimum minutes, 2: maximum minutes to read the post. */
_x( '%1$s–%2$s minutes', 'Range of minutes to read' ),
$min_minutes,
$max_minutes
);
} else {
$minutes_to_read = max( 1, (int) round( $total_words / $average_reading_rate ) );
$time_string = sprintf(
/* translators: %s: the number of minutes to read the post. */
_n( '%s minute', '%s minutes', $minutes_to_read ),
$minutes_to_read
);
}
$parts[] = $time_string;
}
// Add "word count" part, if enabled.
if ( 'words' === $display_mode ) {
$word_count_string = 'words' === $word_count_type ? sprintf(
/* translators: %s: the number of words in the post. */
_n( '%s word', '%s words', $total_words ),
number_format_i18n( $total_words )
) : sprintf(
/* translators: %s: the number of characters in the post. */
_n( '%s character', '%s characters', $total_words ),
number_format_i18n( $total_words )
);
$parts[] = $word_count_string;
}
$display_string = implode( '<br>', $parts );
$align_class_name = empty( $attributes['textAlign'] ) ? '' : "has-text-align-{$attributes['textAlign']}";
$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => $align_class_name ) );
return sprintf(
'<div %1$s>%2$s</div>',
$wrapper_attributes,
$display_string
);
}
/**
* Registers the `core/post-time-to-read` block on the server.
*
* @since 6.9.0
*/
function register_block_core_post_time_to_read() {
register_block_type_from_metadata(
__DIR__ . '/post-time-to-read',
array(
'render_callback' => 'render_block_core_post_time_to_read',
)
);
}
add_action( 'init', 'register_block_core_post_time_to_read' );