<?php

if ( ! function_exists('get_comment_delimited_block_content')) {
    /**
     * Returns the content of a block, including comment delimiters.
     *
     * @since 5.3.1
     *
     * @param string|null $block_name Block name. Null if the block name is unknown,
     *                                      e.g. Classic blocks have their name set to null.
     * @param array       $block_attributes Block attributes.
     * @param string      $block_content Block save content.
     *
     * @return string Comment-delimited block content.
     */
    function get_comment_delimited_block_content($block_name, $block_attributes, $block_content)
    {
        if (is_null($block_name)) {
            return $block_content;
        }

        $serialized_block_name = strip_core_block_namespace($block_name);
        $serialized_attributes = empty($block_attributes) ? '' : serialize_block_attributes($block_attributes) . ' ';

        if (empty($block_content)) {
            return sprintf('<!-- wp:%s %s/-->', $serialized_block_name, $serialized_attributes);
        }

        return sprintf(
            '<!-- wp:%s %s-->%s<!-- /wp:%s -->',
            $serialized_block_name,
            $serialized_attributes,
            $block_content,
            $serialized_block_name
        );
    }
}

if ( ! function_exists('strip_core_block_namespace')) {
    /**
     * Returns the block name to use for serialization. This will remove the default
     * "core/" namespace from a block name.
     *
     * @since 5.3.1
     *
     * @param string $block_name Original block name.
     *
     * @return string Block name to use for serialization.
     */
    function strip_core_block_namespace($block_name = null)
    {
        if (is_string($block_name) && 0 === strpos($block_name, 'core/')) {
            return substr($block_name, 5);
        }

        return $block_name;
    }
}

if ( ! function_exists('serialize_block_attributes')) {
    /**
     * Given an array of attributes, returns a string in the serialized attributes
     * format prepared for post content.
     *
     * The serialized result is a JSON-encoded string, with unicode escape sequence
     * substitution for characters which might otherwise interfere with embedding
     * the result in an HTML comment.
     *
     * @since 5.3.1
     *
     * @param array $block_attributes Attributes object.
     *
     * @return string Serialized attributes.
     */
    function serialize_block_attributes($block_attributes)
    {
        $encoded_attributes = json_encode($block_attributes);
        $encoded_attributes = preg_replace('/--/', '\\u002d\\u002d', $encoded_attributes);
        $encoded_attributes = preg_replace('/</', '\\u003c', $encoded_attributes);
        $encoded_attributes = preg_replace('/>/', '\\u003e', $encoded_attributes);
        $encoded_attributes = preg_replace('/&/', '\\u0026', $encoded_attributes);
        // Regex: /\\"/
        $encoded_attributes = preg_replace('/\\\\"/', '\\u0022', $encoded_attributes);

        return $encoded_attributes;
    }
}