138 lines
5.2 KiB
PHP
138 lines
5.2 KiB
PHP
<?php
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/**
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* Block support flags.
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*
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* @package WordPress
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*/
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// Require all the block supports mechanisms.
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require __DIR__ . '/align.php';
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require __DIR__ . '/colors.php';
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require __DIR__ . '/custom-classname.php';
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require __DIR__ . '/generated-classname.php';
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require __DIR__ . '/typography.php';
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/**
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* Filter the registered blocks to apply the block supports attributes registration.
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*/
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function wp_register_block_supports() {
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$block_registry = WP_Block_Type_Registry::get_instance();
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$registered_block_types = $block_registry->get_all_registered();
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// Ideally we need a hook to extend the block registration
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// instead of mutating the block type.
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foreach ( $registered_block_types as $block_type ) {
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wp_register_alignment_support( $block_type );
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wp_register_colors_support( $block_type );
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wp_register_typography_support( $block_type );
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wp_register_custom_classname_support( $block_type );
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}
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}
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add_action( 'init', 'wp_register_block_supports', 21 );
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/**
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* Filters the frontend output of blocks and apply the block support flags transformations.
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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_apply_block_supports( $block_content, $block ) {
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if ( ! isset( $block['attrs'] ) ) {
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return $block_content;
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}
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$block_type = WP_Block_Type_Registry::get_instance()->get_registered( $block['blockName'] );
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// If no render_callback, assume styles have been previously handled.
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if ( ! $block_type || ! $block_type->render_callback ) {
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return $block_content;
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}
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$attributes = array();
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$attributes = wp_apply_generated_classname_support( $attributes, $block['attrs'], $block_type );
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$attributes = wp_apply_colors_support( $attributes, $block['attrs'], $block_type );
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$attributes = wp_apply_typography_support( $attributes, $block['attrs'], $block_type );
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$attributes = wp_apply_alignment_support( $attributes, $block['attrs'], $block_type );
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$attributes = wp_apply_custom_classname_support( $attributes, $block['attrs'], $block_type );
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if ( ! count( $attributes ) ) {
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return $block_content;
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}
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$dom = new DOMDocument( '1.0', 'utf-8' );
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// Suppress DOMDocument::loadHTML warnings from polluting the front-end.
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$previous = libxml_use_internal_errors( true );
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// We need to wrap the block in order to handle UTF-8 properly.
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$wrapped_block_html =
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'<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body>'
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. $block_content
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. '</body></html>';
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$success = $dom->loadHTML( $wrapped_block_html, LIBXML_HTML_NODEFDTD | LIBXML_COMPACT );
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// Clear errors and reset the use_errors setting.
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libxml_clear_errors();
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libxml_use_internal_errors( $previous );
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if ( ! $success ) {
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return $block_content;
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}
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// Structure is like `<html><head/><body/></html>`, so body is the `lastChild` of our document.
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$body_element = $dom->documentElement->lastChild; // phpcs:ignore WordPress.NamingConventions.ValidVariableName.UsedPropertyNotSnakeCase
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$xpath = new DOMXPath( $dom );
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$block_root = $xpath->query( './*', $body_element )[0];
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// phpcs:ignore WordPress.NamingConventions.ValidVariableName.UsedPropertyNotSnakeCase
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if ( empty( $block_root ) ) {
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return $block_content;
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}
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// Merge and dedupe new and existing classes and styles.
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$current_classes = explode( ' ', trim( $block_root->getAttribute( 'class' ) ) );
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$classes_to_add = array_key_exists( 'css_classes', $attributes ) ? $attributes['css_classes'] : array();
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$new_classes = array_unique( array_filter( array_merge( $current_classes, $classes_to_add ) ) );
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$current_styles = preg_split( '/\s*;\s*/', trim( $block_root->getAttribute( 'style' ) ) );
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$styles_to_add = array_key_exists( 'inline_styles', $attributes ) ? $attributes['inline_styles'] : array();
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$new_styles = array_unique( array_map( 'wp_normalize_css_rule', array_filter( array_merge( $current_styles, $styles_to_add ) ) ) );
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// Apply new styles and classes.
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if ( ! empty( $new_classes ) ) {
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// `DOMElement::setAttribute` handles attribute value escaping.
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$block_root->setAttribute( 'class', implode( ' ', $new_classes ) );
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}
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if ( ! empty( $new_styles ) ) {
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// `DOMElement::setAttribute` handles attribute value escaping.
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$block_root->setAttribute( 'style', implode( '; ', $new_styles ) . ';' );
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}
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// Avoid using `$dom->saveHtml( $node )` because the node results may not produce consistent
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// whitespace for PHP < 7.3. Saving the root HTML `$dom->saveHtml()` prevents this behavior.
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$full_html = $dom->saveHtml();
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// Find the <body> open/close tags. The open tag needs to be adjusted so we get inside the tag
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// and not the tag itself.
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$start = strpos( $full_html, '<body>', 0 ) + strlen( '<body>' );
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$end = strpos( $full_html, '</body>', $start );
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return trim( substr( $full_html, $start, $end - $start ) );
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}
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add_filter( 'render_block', 'wp_apply_block_supports', 10, 2 );
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/**
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* Normalizes spacing in a string representing a CSS rule
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*
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* @example
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* 'color :red;' becomes 'color:red'
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*
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* @param string $css_rule_string CSS rule.
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* @return string Normalized CSS rule.
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*/
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function wp_normalize_css_rule( $css_rule_string ) {
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return trim( implode( ': ', preg_split( '/\s*:\s*/', $css_rule_string, 2 ) ), ';' );
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}
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