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<?php
/**
 * Elements styles block support.
 *
 * @package WordPress
 * @since 5.8.0
 */

/**
 * Render the elements stylesheet.
 *
 * @since 5.8.0
 * @access private
 *
 * @param  string $block_content Rendered block content.
 * @param  array  $block         Block object.
 * @return string                Filtered block content.
 */
function wp_render_elements_support( $block_content, $block ) {
	$link_color = null;
	if ( ! empty( $block['attrs'] ) ) {
		$link_color = _wp_array_get( $block['attrs'], array( 'style', 'elements', 'link', 'color', 'text' ), null );
	}

/*
	* For now we only care about link color.
	* This code in the future when we have a public API
	* should take advantage of WP_Theme_JSON::compute_style_properties
	* and work for any element and style.
	*/
	if ( null === $link_color ) {
		return $block_content;
	}

$class_name = 'wp-elements-' . uniqid();

if ( strpos( $link_color, 'var:preset|color|' ) !== false ) {
		// Get the name from the string and add proper styles.
		$index_to_splice = strrpos( $link_color, '|' ) + 1;
		$link_color_name = substr( $link_color, $index_to_splice );
		$link_color      = "var(--wp--preset--color--$link_color_name)";
	}
	$link_color_declaration = esc_html( safecss_filter_attr( "color: $link_color" ) );

$style = "<style>.$class_name a{" . $link_color_declaration . " !important;}</style>\n";

// Like the layout hook this assumes the hook only applies to blocks with a single wrapper.
	// Retrieve the opening tag of the first HTML element.
	$html_element_matches = array();
	preg_match( '/<[^>]+>/', $block_content, $html_element_matches, PREG_OFFSET_CAPTURE );
	$first_element = $html_element_matches[0][0];
	// If the first HTML element has a class attribute just add the new class
	// as we do on layout and duotone.
	if ( strpos( $first_element, 'class="' ) !== false ) {
		$content = preg_replace(
			'/' . preg_quote( 'class="', '/' ) . '/',
			'class="' . $class_name . ' ',
			$block_content,
			1
		);
	} else {
		// If the first HTML element has no class attribute we should inject the attribute before the attribute at the end.
		$first_element_offset = $html_element_matches[0][1];
		$content              = substr_replace( $block_content, ' class="' . $class_name . '"', $first_element_offset + strlen( $first_element ) - 1, 0 );
	}

return $content . $style;

}

add_filter( 'render_block', 'wp_render_elements_support', 10, 2 );