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<?php |
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/** |
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* Elements styles block support. |
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* |
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* @package gutenberg |
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*/ |
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|
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/** |
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* Render the elements stylesheet. |
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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 gutenberg_render_elements_support( $block_content, $block ) { |
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|
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if ( ! $block_content ) { |
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return $block_content; |
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} |
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|
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$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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/* |
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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_Gutenberg::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 $block_content; |
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} |
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|
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$class_name = 'wp-elements-' . uniqid(); |
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|
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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: $link_color" ) ); |
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|
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$style = "<style>.$class_name a{" . $link_color_declaration . ";}</style>\n"; |
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|
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// Like the layout hook this assumes the hook only applies to blocks with a single wrapper. |
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// Retrieve the opening tag of the first HTML element. |
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$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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|
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// Ideally styles should be loaded in the head, but blocks may be parsed |
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// after that, so loading in the footer for now. |
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// See https://core.trac.wordpress.org/ticket/53494. |
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add_action( |
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'wp_footer', |
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function () use ( $style ) { |
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echo $style; |
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} |
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); |
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|
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return $content; |
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} |
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|
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// Remove WordPress core filter to avoid rendering duplicate elements stylesheet. |
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remove_filter( 'render_block', 'wp_render_elements_support', 10, 2 ); |
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add_filter( 'render_block', 'gutenberg_render_elements_support', 10, 2 ); |
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