<?php

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/**

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* Server-side rendering of the `core/post-excerpt` block.

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*

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* @package WordPress

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*/

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/**

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* Renders the `core/post-excerpt` block on the server.

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*

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* @since 5.8.0

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*

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* @param array $attributes Block attributes.

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* @param string $content Block default content.

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* @param WP_Block $block Block instance.

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* @return string Returns the filtered post excerpt for the current post wrapped inside "p" tags.

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*/

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function render_block_core_post_excerpt( $attributes, $content, $block ) {

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if ( ! isset( $block->context['postId'] ) ) {

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return '';

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}

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/*

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* The purpose of the excerpt length setting is to limit the length of both

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* automatically generated and user-created excerpts.

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* Because the excerpt_length filter only applies to auto generated excerpts,

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* wp_trim_words is used instead.

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*/

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$excerpt_length = $attributes['excerptLength'];

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$excerpt = get_the_excerpt( $block->context['postId'] );

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if ( isset( $excerpt_length ) ) {

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$excerpt = wp_trim_words( $excerpt, $excerpt_length );

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}

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$more_text = ! empty( $attributes['moreText'] ) ? '<a class="wp-block-post-excerpt__more-link" href="' . esc_url( get_the_permalink( $block->context['postId'] ) ) . '">' . wp_kses_post( $attributes['moreText'] ) . '</a>' : '';

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$filter_excerpt_more = static function ( $more ) use ( $more_text ) {

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return empty( $more_text ) ? $more : '';

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};

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/**

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* Some themes might use `excerpt_more` filter to handle the

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* `more` link displayed after a trimmed excerpt. Since the

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* block has a `more text` attribute we have to check and

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* override if needed the return value from this filter.

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* So if the block's attribute is not empty override the

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* `excerpt_more` filter and return nothing. This will

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* result in showing only one `read more` link at a time.

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*/

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add_filter( 'excerpt_more', $filter_excerpt_more );

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$classes = array();

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if ( isset( $attributes['textAlign'] ) ) {

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$classes[] = 'has-text-align-' . $attributes['textAlign'];

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}

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if ( isset( $attributes['style']['elements']['link']['color']['text'] ) ) {

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$classes[] = 'has-link-color';

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}

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$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => implode( ' ', $classes ) ) );

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$content = '<p class="wp-block-post-excerpt__excerpt">' . $excerpt;

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$show_more_on_new_line = ! isset( $attributes['showMoreOnNewLine'] ) || $attributes['showMoreOnNewLine'];

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if ( $show_more_on_new_line && ! empty( $more_text ) ) {

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$content .= '</p><p class="wp-block-post-excerpt__more-text">' . $more_text . '</p>';

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} else {

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$content .= " $more_text</p>";

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}

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remove_filter( 'excerpt_more', $filter_excerpt_more );

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return sprintf( '<div %1$s>%2$s</div>', $wrapper_attributes, $content );

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}

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/**

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* Registers the `core/post-excerpt` block on the server.

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*

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* @since 5.8.0

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*/

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function register_block_core_post_excerpt() {

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register_block_type_from_metadata(

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__DIR__ . '/post-excerpt',

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array(

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'render_callback' => 'render_block_core_post_excerpt',

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)

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);

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}

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add_action( 'init', 'register_block_core_post_excerpt' );

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/**

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* If themes or plugins filter the excerpt_length, we need to

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* override the filter in the editor, otherwise

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* the excerpt length block setting has no effect.

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* Returns 100 because 100 is the max length in the setting.

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*/

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if ( is_admin() ||

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defined( 'REST_REQUEST' ) && REST_REQUEST ) {

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add_filter(

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'excerpt_length',

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static function () {

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return 100;

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},

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PHP_INT_MAX

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);

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}

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