<?php

    function wpautop( $pee, $br = true ) {
        $pre_tags = array();
    
        if ( trim( $pee ) === '' ) {
            return '';
        }
    
        // Just to make things a little easier, pad the end.
        $pee = $pee . "\n";
    
        /*
        * Pre tags shouldn't be touched by autop.
        * Replace pre tags with placeholders and bring them back after autop.
        */
        if ( strpos( $pee, '<pre' ) !== false ) {
            $pee_parts = explode( '</pre>', $pee );
            $last_pee  = array_pop( $pee_parts );
            $pee       = '';
            $i         = 0;
    
            foreach ( $pee_parts as $pee_part ) {
                $start = strpos( $pee_part, '<pre' );
    
                // Malformed html?
                if ( $start === false ) {
                    $pee .= $pee_part;
                    continue;
                }
    
                $name              = "<pre wp-pre-tag-$i></pre>";
                $pre_tags[ $name ] = substr( $pee_part, $start ) . '</pre>';
    
                $pee .= substr( $pee_part, 0, $start ) . $name;
                $i++;
            }
    
            $pee .= $last_pee;
        }
        // Change multiple <br>s into two line breaks, which will turn into paragraphs.
        $pee = preg_replace( '|<br\s*/?>\s*<br\s*/?>|', "\n\n", $pee );
    
        $allblocks = '(?:table|thead|tfoot|caption|col|colgroup|tbody|tr|td|th|div|dl|dd|dt|ul|ol|li|pre|form|map|area|blockquote|address|math|style|p|h[1-6]|hr|fieldset|legend|section|article|aside|hgroup|header|footer|nav|figure|figcaption|details|menu|summary)';
    
        // Add a double line break above block-level opening tags.
        $pee = preg_replace( '!(<' . $allblocks . '[\s/>])!', "\n\n$1", $pee );
    
        // Add a double line break below block-level closing tags.
        $pee = preg_replace( '!(</' . $allblocks . '>)!', "$1\n\n", $pee );
    
        // Add a double line break after hr tags, which are self closing.
        $pee = preg_replace( '!(<hr\s*?/?>)!', "$1\n\n", $pee );
    
        // Standardize newline characters to "\n".
        $pee = str_replace( array( "\r\n", "\r" ), "\n", $pee );
    
        // Find newlines in all elements and add placeholders.
        $pee = wp_replace_in_html_tags( $pee, array( "\n" => ' <!-- wpnl --> ' ) );
    
        // Collapse line breaks before and after <option> elements so they don't get autop'd.
        if ( strpos( $pee, '<option' ) !== false ) {
            $pee = preg_replace( '|\s*<option|', '<option', $pee );
            $pee = preg_replace( '|</option>\s*|', '</option>', $pee );
        }
    
        /*
        * Collapse line breaks inside <object> elements, before <param> and <embed> elements
        * so they don't get autop'd.
        */
        if ( strpos( $pee, '</object>' ) !== false ) {
            $pee = preg_replace( '|(<object[^>]*>)\s*|', '$1', $pee );
            $pee = preg_replace( '|\s*</object>|', '</object>', $pee );
            $pee = preg_replace( '%\s*(</?(?:param|embed)[^>]*>)\s*%', '$1', $pee );
        }
    
        /*
        * Collapse line breaks inside <audio> and <video> elements,
        * before and after <source> and <track> elements.
        */
        if ( strpos( $pee, '<source' ) !== false || strpos( $pee, '<track' ) !== false ) {
            $pee = preg_replace( '%([<\[](?:audio|video)[^>\]]*[>\]])\s*%', '$1', $pee );
            $pee = preg_replace( '%\s*([<\[]/(?:audio|video)[>\]])%', '$1', $pee );
            $pee = preg_replace( '%\s*(<(?:source|track)[^>]*>)\s*%', '$1', $pee );
        }
    
        // Collapse line breaks before and after <figcaption> elements.
        if ( strpos( $pee, '<figcaption' ) !== false ) {
            $pee = preg_replace( '|\s*(<figcaption[^>]*>)|', '$1', $pee );
            $pee = preg_replace( '|</figcaption>\s*|', '</figcaption>', $pee );
        }
    
        // Remove more than two contiguous line breaks.
        $pee = preg_replace( "/\n\n+/", "\n\n", $pee );
    
        // Split up the contents into an array of strings, separated by double line breaks.
        $pees = preg_split( '/\n\s*\n/', $pee, -1, PREG_SPLIT_NO_EMPTY );
    
        // Reset $pee prior to rebuilding.
        $pee = '';
    
        // Rebuild the content as a string, wrapping every bit with a <p>.
        foreach ( $pees as $tinkle ) {
            $pee .= '<p>' . trim( $tinkle, "\n" ) . "</p>\n";
        }
    
        // Under certain strange conditions it could create a P of entirely whitespace.
        $pee = preg_replace( '|<p>\s*</p>|', '', $pee );
    
        // Add a closing <p> inside <div>, <address>, or <form> tag if missing.
        $pee = preg_replace( '!<p>([^<]+)</(div|address|form)>!', '<p>$1</p></$2>', $pee );
    
        // If an opening or closing block element tag is wrapped in a <p>, unwrap it.
        $pee = preg_replace( '!<p>\s*(</?' . $allblocks . '[^>]*>)\s*</p>!', '$1', $pee );
    
        // In some cases <li> may get wrapped in <p>, fix them.
        $pee = preg_replace( '|<p>(<li.+?)</p>|', '$1', $pee );
    
        // If a <blockquote> is wrapped with a <p>, move it inside the <blockquote>.
        $pee = preg_replace( '|<p><blockquote([^>]*)>|i', '<blockquote$1><p>', $pee );
        $pee = str_replace( '</blockquote></p>', '</p></blockquote>', $pee );
    
        // If an opening or closing block element tag is preceded by an opening <p> tag, remove it.
        $pee = preg_replace( '!<p>\s*(</?' . $allblocks . '[^>]*>)!', '$1', $pee );
    
        // If an opening or closing block element tag is followed by a closing <p> tag, remove it.
        $pee = preg_replace( '!(</?' . $allblocks . '[^>]*>)\s*</p>!', '$1', $pee );
    
        // Optionally insert line breaks.
        if ( $br ) {
            // Replace newlines that shouldn't be touched with a placeholder.
            $pee = preg_replace_callback( '/<(script|style|svg).*?<\/\\1>/s', '_autop_newline_preservation_helper', $pee );
    
            // Normalize <br>
            $pee = str_replace( array( '<br>', '<br/>' ), '<br />', $pee );
    
            // Replace any new line characters that aren't preceded by a <br /> with a <br />.
            $pee = preg_replace( '|(?<!<br />)\s*\n|', "<br />\n", $pee );
    
            // Replace newline placeholders with newlines.
            $pee = str_replace( '<WPPreserveNewline />', "\n", $pee );
        }
    
        // If a <br /> tag is after an opening or closing block tag, remove it.
        $pee = preg_replace( '!(</?' . $allblocks . '[^>]*>)\s*<br />!', '$1', $pee );
    
        // If a <br /> tag is before a subset of opening or closing block tags, remove it.
        $pee = preg_replace( '!<br />(\s*</?(?:p|li|div|dl|dd|dt|th|pre|td|ul|ol)[^>]*>)!', '$1', $pee );
        $pee = preg_replace( "|\n</p>$|", '</p>', $pee );
    
        // Replace placeholder <pre> tags with their original content.
        if ( ! empty( $pre_tags ) ) {
            $pee = str_replace( array_keys( $pre_tags ), array_values( $pre_tags ), $pee );
        }
    
        // Restore newlines in all elements.
        if ( false !== strpos( $pee, '<!-- wpnl -->' ) ) {
            $pee = str_replace( array( ' <!-- wpnl --> ', '<!-- wpnl -->' ), "\n", $pee );
        }
    
        return $pee;
    }

    function _autop_newline_preservation_helper( $matches ) {
        return str_replace( "\n", '<WPPreserveNewline />', $matches[0] );
    }

    function wp_replace_in_html_tags( $haystack, $replace_pairs ) {
        // Find all elements.
        $textarr = wp_html_split( $haystack );
        $changed = false;
     
        // Optimize when searching for one item.
        if ( 1 === count( $replace_pairs ) ) {
            // Extract $needle and $replace.
            foreach ( $replace_pairs as $needle => $replace ) {
            }
     
            // Loop through delimiters (elements) only.
            for ( $i = 1, $c = count( $textarr ); $i < $c; $i += 2 ) {
                if ( false !== strpos( $textarr[ $i ], $needle ) ) {
                    $textarr[ $i ] = str_replace( $needle, $replace, $textarr[ $i ] );
                    $changed       = true;
                }
            }
        } else {
            // Extract all $needles.
            $needles = array_keys( $replace_pairs );
     
            // Loop through delimiters (elements) only.
            for ( $i = 1, $c = count( $textarr ); $i < $c; $i += 2 ) {
                foreach ( $needles as $needle ) {
                    if ( false !== strpos( $textarr[ $i ], $needle ) ) {
                        $textarr[ $i ] = strtr( $textarr[ $i ], $replace_pairs );
                        $changed       = true;
                        // After one strtr() break out of the foreach loop and look at next element.
                        break;
                    }
                }
            }
        }
     
        if ( $changed ) {
            $haystack = implode( $textarr );
        }
     
        return $haystack;
    }

    function wp_html_split( $input ) {
        return preg_split( get_html_split_regex(), $input, -1, PREG_SPLIT_DELIM_CAPTURE );
    }

    function get_html_split_regex() {
        static $regex;
     
        if ( ! isset( $regex ) ) {
            // phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation
            $comments =
                '!'             // Start of comment, after the <.
                . '(?:'         // Unroll the loop: Consume everything until --> is found.
                .     '-(?!->)' // Dash not followed by end of comment.
                .     '[^\-]*+' // Consume non-dashes.
                . ')*+'         // Loop possessively.
                . '(?:-->)?';   // End of comment. If not found, match all input.
     
            $cdata =
                '!\[CDATA\['    // Start of comment, after the <.
                . '[^\]]*+'     // Consume non-].
                . '(?:'         // Unroll the loop: Consume everything until ]]> is found.
                .     '](?!]>)' // One ] not followed by end of comment.
                .     '[^\]]*+' // Consume non-].
                . ')*+'         // Loop possessively.
                . '(?:]]>)?';   // End of comment. If not found, match all input.
     
            $escaped =
                '(?='             // Is the element escaped?
                .    '!--'
                . '|'
                .    '!\[CDATA\['
                . ')'
                . '(?(?=!-)'      // If yes, which type?
                .     $comments
                . '|'
                .     $cdata
                . ')';
     
            $regex =
                '/('                // Capture the entire match.
                .     '<'           // Find start of element.
                .     '(?'          // Conditional expression follows.
                .         $escaped  // Find end of escaped element.
                .     '|'           // ... else ...
                .         '[^>]*>?' // Find end of normal element.
                .     ')'
                . ')/';
            // phpcs:enable
        }
     
        return $regex;
    }