72 lines
2.4 KiB
PHP
72 lines
2.4 KiB
PHP
<?php
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/**
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* Elements styles block support.
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*
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* @package WordPress
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* @since 5.8.0
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*/
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/**
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* Render the elements stylesheet.
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*
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* @since 5.8.0
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* @access private
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*
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* @param string $block_content Rendered block content.
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* @param array $block Block object.
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* @return string Filtered block content.
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*/
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function wp_render_elements_support( $block_content, $block ) {
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$link_color = null;
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if ( ! empty( $block['attrs'] ) ) {
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$link_color = _wp_array_get( $block['attrs'], array( 'style', 'elements', 'link', 'color', 'text' ), null );
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}
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/*
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* For now we only care about link color.
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* This code in the future when we have a public API
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* should take advantage of WP_Theme_JSON::compute_style_properties
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* and work for any element and style.
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*/
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if ( null === $link_color ) {
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return $block_content;
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}
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$class_name = 'wp-elements-' . uniqid();
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if ( strpos( $link_color, 'var:preset|color|' ) !== false ) {
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// Get the name from the string and add proper styles.
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$index_to_splice = strrpos( $link_color, '|' ) + 1;
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$link_color_name = substr( $link_color, $index_to_splice );
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$link_color = "var(--wp--preset--color--$link_color_name)";
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}
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$link_color_declaration = esc_html( safecss_filter_attr( "color: $link_color" ) );
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$style = "<style>.$class_name a{" . $link_color_declaration . " !important;}</style>\n";
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// Like the layout hook this assumes the hook only applies to blocks with a single wrapper.
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// Retrieve the opening tag of the first HTML element.
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$html_element_matches = array();
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preg_match( '/<[^>]+>/', $block_content, $html_element_matches, PREG_OFFSET_CAPTURE );
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$first_element = $html_element_matches[0][0];
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// If the first HTML element has a class attribute just add the new class
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// as we do on layout and duotone.
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if ( strpos( $first_element, 'class="' ) !== false ) {
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$content = preg_replace(
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'/' . preg_quote( 'class="', '/' ) . '/',
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'class="' . $class_name . ' ',
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$block_content,
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1
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);
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} else {
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// If the first HTML element has no class attribute we should inject the attribute before the attribute at the end.
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$first_element_offset = $html_element_matches[0][1];
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$content = substr_replace( $block_content, ' class="' . $class_name . '"', $first_element_offset + strlen( $first_element ) - 1, 0 );
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}
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return $content . $style;
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}
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add_filter( 'render_block', 'wp_render_elements_support', 10, 2 );
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