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/home/tahkoom/public_html/wp-content/plugins/chatbot/includes/Parsedown.php
<?php

#
#
# Parsedown
# http://parsedown.org
#
# (c) Emanuil Rusev
# http://erusev.com
#
# For the full license information, view the LICENSE file that was distributed
# with this source code.
#
#
if(!class_exists('Parsedown')){
    class Parsedown
    {
        # ~

        const version = '1.8.0-beta-7';

        # ~

        function text($text)
        {
            $Elements = $this->textElements($text);

            # convert to markup
            $markup = $this->elements($Elements);

            # trim line breaks
            $markup = trim($markup, "\n");

            return $markup;
        }

        protected function textElements($text)
        {
            # make sure no definitions are set
            $this->DefinitionData = array();

            # standardize line breaks
            $text = str_replace(array("\r\n", "\r"), "\n", $text);

            # remove surrounding line breaks
            $text = trim($text, "\n");

            # split text into lines
            $lines = explode("\n", $text);

            # iterate through lines to identify blocks
            return $this->linesElements($lines);
        }

        #
        # Setters
        #

        function setBreaksEnabled($breaksEnabled)
        {
            $this->breaksEnabled = $breaksEnabled;

            return $this;
        }

        protected $breaksEnabled;

        function setMarkupEscaped($markupEscaped)
        {
            $this->markupEscaped = $markupEscaped;

            return $this;
        }

        protected $markupEscaped;

        function setUrlsLinked($urlsLinked)
        {
            $this->urlsLinked = $urlsLinked;

            return $this;
        }

        protected $urlsLinked = true;

        function setSafeMode($safeMode)
        {
            $this->safeMode = (bool) $safeMode;

            return $this;
        }

        protected $safeMode;

        function setStrictMode($strictMode)
        {
            $this->strictMode = (bool) $strictMode;

            return $this;
        }

        protected $strictMode;

        protected $safeLinksWhitelist = array(
            'http://',
            'https://',
            'ftp://',
            'ftps://',
            'mailto:',
            'tel:',
            'data:image/png;base64,',
            'data:image/gif;base64,',
            'data:image/jpeg;base64,',
            'irc:',
            'ircs:',
            'git:',
            'ssh:',
            'news:',
            'steam:',
        );

        #
        # Lines
        #

        protected $BlockTypes = array(
            '#' => array('Header'),
            '*' => array('Rule', 'List'),
            '+' => array('List'),
            '-' => array('SetextHeader', 'Table', 'Rule', 'List'),
            '0' => array('List'),
            '1' => array('List'),
            '2' => array('List'),
            '3' => array('List'),
            '4' => array('List'),
            '5' => array('List'),
            '6' => array('List'),
            '7' => array('List'),
            '8' => array('List'),
            '9' => array('List'),
            ':' => array('Table'),
            '<' => array('Comment', 'Markup'),
            '=' => array('SetextHeader'),
            '>' => array('Quote'),
            '[' => array('Reference'),
            '_' => array('Rule'),
            '`' => array('FencedCode'),
            '|' => array('Table'),
            '~' => array('FencedCode'),
        );

        # ~

        protected $unmarkedBlockTypes = array(
            'Code',
        );

        #
        # Blocks
        #

        protected function lines(array $lines)
        {
            return $this->elements($this->linesElements($lines));
        }

        protected function linesElements(array $lines)
        {
            $Elements = array();
            $CurrentBlock = null;

            foreach ($lines as $line)
            {
                if (chop($line) === '')
                {
                    if (isset($CurrentBlock))
                    {
                        $CurrentBlock['interrupted'] = (isset($CurrentBlock['interrupted'])
                            ? $CurrentBlock['interrupted'] + 1 : 1
                        );
                    }

                    continue;
                }

                while (($beforeTab = strstr($line, "\t", true)) !== false)
                {
                    $shortage = 4 - mb_strlen($beforeTab, 'utf-8') % 4;

                    $line = $beforeTab
                        . str_repeat(' ', $shortage)
                        . substr($line, strlen($beforeTab) + 1)
                    ;
                }

                $indent = strspn($line, ' ');

                $text = $indent > 0 ? substr($line, $indent) : $line;

                # ~

                $Line = array('body' => $line, 'indent' => $indent, 'text' => $text);

                # ~

                if (isset($CurrentBlock['continuable']))
                {
                    $methodName = 'block' . $CurrentBlock['type'] . 'Continue';
                    $Block = $this->$methodName($Line, $CurrentBlock);

                    if (isset($Block))
                    {
                        $CurrentBlock = $Block;

                        continue;
                    }
                    else
                    {
                        if ($this->isBlockCompletable($CurrentBlock['type']))
                        {
                            $methodName = 'block' . $CurrentBlock['type'] . 'Complete';
                            $CurrentBlock = $this->$methodName($CurrentBlock);
                        }
                    }
                }

                # ~

                $marker = $text[0];

                # ~

                $blockTypes = $this->unmarkedBlockTypes;

                if (isset($this->BlockTypes[$marker]))
                {
                    foreach ($this->BlockTypes[$marker] as $blockType)
                    {
                        $blockTypes []= $blockType;
                    }
                }

                #
                # ~

                foreach ($blockTypes as $blockType)
                {
                    $Block = $this->{"block$blockType"}($Line, $CurrentBlock);

                    if (isset($Block))
                    {
                        $Block['type'] = $blockType;

                        if ( ! isset($Block['identified']))
                        {
                            if (isset($CurrentBlock))
                            {
                                $Elements[] = $this->extractElement($CurrentBlock);
                            }

                            $Block['identified'] = true;
                        }

                        if ($this->isBlockContinuable($blockType))
                        {
                            $Block['continuable'] = true;
                        }

                        $CurrentBlock = $Block;

                        continue 2;
                    }
                }

                # ~

                if (isset($CurrentBlock) and $CurrentBlock['type'] === 'Paragraph')
                {
                    $Block = $this->paragraphContinue($Line, $CurrentBlock);
                }

                if (isset($Block))
                {
                    $CurrentBlock = $Block;
                }
                else
                {
                    if (isset($CurrentBlock))
                    {
                        $Elements[] = $this->extractElement($CurrentBlock);
                    }

                    $CurrentBlock = $this->paragraph($Line);

                    $CurrentBlock['identified'] = true;
                }
            }

            # ~

            if (isset($CurrentBlock['continuable']) and $this->isBlockCompletable($CurrentBlock['type']))
            {
                $methodName = 'block' . $CurrentBlock['type'] . 'Complete';
                $CurrentBlock = $this->$methodName($CurrentBlock);
            }

            # ~

            if (isset($CurrentBlock))
            {
                $Elements[] = $this->extractElement($CurrentBlock);
            }

            # ~

            return $Elements;
        }

        protected function extractElement(array $Component)
        {
            if ( ! isset($Component['element']))
            {
                if (isset($Component['markup']))
                {
                    $Component['element'] = array('rawHtml' => $Component['markup']);
                }
                elseif (isset($Component['hidden']))
                {
                    $Component['element'] = array();
                }
            }

            return $Component['element'];
        }

        protected function isBlockContinuable($Type)
        {
            return method_exists($this, 'block' . $Type . 'Continue');
        }

        protected function isBlockCompletable($Type)
        {
            return method_exists($this, 'block' . $Type . 'Complete');
        }

        #
        # Code

        protected function blockCode($Line, $Block = null)
        {
            if (isset($Block) and $Block['type'] === 'Paragraph' and ! isset($Block['interrupted']))
            {
                return;
            }

            if ($Line['indent'] >= 4)
            {
                $text = substr($Line['body'], 4);

                $Block = array(
                    'element' => array(
                        'name' => 'pre',
                        'element' => array(
                            'name' => 'code',
                            'text' => $text,
                        ),
                    ),
                );

                return $Block;
            }
        }

        protected function blockCodeContinue($Line, $Block)
        {
            if ($Line['indent'] >= 4)
            {
                if (isset($Block['interrupted']))
                {
                    $Block['element']['element']['text'] .= str_repeat("\n", $Block['interrupted']);

                    unset($Block['interrupted']);
                }

                $Block['element']['element']['text'] .= "\n";

                $text = substr($Line['body'], 4);

                $Block['element']['element']['text'] .= $text;

                return $Block;
            }
        }

        protected function blockCodeComplete($Block)
        {
            return $Block;
        }

        #
        # Comment

        protected function blockComment($Line)
        {
            if ($this->markupEscaped or $this->safeMode)
            {
                return;
            }

            if (strpos($Line['text'], '<!--') === 0)
            {
                $Block = array(
                    'element' => array(
                        'rawHtml' => $Line['body'],
                        'autobreak' => true,
                    ),
                );

                if (strpos($Line['text'], '-->') !== false)
                {
                    $Block['closed'] = true;
                }

                return $Block;
            }
        }

        protected function blockCommentContinue($Line, array $Block)
        {
            if (isset($Block['closed']))
            {
                return;
            }

            $Block['element']['rawHtml'] .= "\n" . $Line['body'];

            if (strpos($Line['text'], '-->') !== false)
            {
                $Block['closed'] = true;
            }

            return $Block;
        }

        #
        # Fenced Code

        protected function blockFencedCode($Line)
        {
            $marker = $Line['text'][0];

            $openerLength = strspn($Line['text'], $marker);

            if ($openerLength < 3)
            {
                return;
            }

            $infostring = trim(substr($Line['text'], $openerLength), "\t ");

            if (strpos($infostring, '`') !== false)
            {
                return;
            }

            $Element = array(
                'name' => 'code',
                'text' => '',
            );

            if ($infostring !== '')
            {
                /**
                 * https://www.w3.org/TR/2011/WD-html5-20110525/elements.html#classes
                 * Every HTML element may have a class attribute specified.
                 * The attribute, if specified, must have a value that is a set
                 * of space-separated tokens representing the various classes
                 * that the element belongs to.
                 * [...]
                 * The space characters, for the purposes of this specification,
                 * are U+0020 SPACE, U+0009 CHARACTER TABULATION (tab),
                 * U+000A LINE FEED (LF), U+000C FORM FEED (FF), and
                 * U+000D CARRIAGE RETURN (CR).
                 */
                $language = substr($infostring, 0, strcspn($infostring, " \t\n\f\r"));

                $Element['attributes'] = array('class' => "language-$language");
            }

            $Block = array(
                'char' => $marker,
                'openerLength' => $openerLength,
                'element' => array(
                    'name' => 'pre',
                    'element' => $Element,
                ),
            );

            return $Block;
        }

        protected function blockFencedCodeContinue($Line, $Block)
        {
            if (isset($Block['complete']))
            {
                return;
            }

            if (isset($Block['interrupted']))
            {
                $Block['element']['element']['text'] .= str_repeat("\n", $Block['interrupted']);

                unset($Block['interrupted']);
            }

            if (($len = strspn($Line['text'], $Block['char'])) >= $Block['openerLength']
                and chop(substr($Line['text'], $len), ' ') === ''
            ) {
                $Block['element']['element']['text'] = substr($Block['element']['element']['text'], 1);

                $Block['complete'] = true;

                return $Block;
            }

            $Block['element']['element']['text'] .= "\n" . $Line['body'];

            return $Block;
        }

        protected function blockFencedCodeComplete($Block)
        {
            return $Block;
        }

        #
        # Header

        protected function blockHeader($Line)
        {
            $level = strspn($Line['text'], '#');

            if ($level > 6)
            {
                return;
            }

            $text = trim($Line['text'], '#');

            if ($this->strictMode and isset($text[0]) and $text[0] !== ' ')
            {
                return;
            }

            $text = trim($text, ' ');

            $Block = array(
                'element' => array(
                    'name' => 'h' . $level,
                    'handler' => array(
                        'function' => 'lineElements',
                        'argument' => $text,
                        'destination' => 'elements',
                    )
                ),
            );

            return $Block;
        }

        #
        # List

        protected function blockList($Line, ?array $CurrentBlock = null)
        {
            list($name, $pattern) = $Line['text'][0] <= '-' ? array('ul', '[*+-]') : array('ol', '[0-9]{1,9}+[.\)]');

            if (preg_match('/^('.$pattern.'([ ]++|$))(.*+)/', $Line['text'], $matches))
            {
                $contentIndent = strlen($matches[2]);

                if ($contentIndent >= 5)
                {
                    $contentIndent -= 1;
                    $matches[1] = substr($matches[1], 0, -$contentIndent);
                    $matches[3] = str_repeat(' ', $contentIndent) . $matches[3];
                }
                elseif ($contentIndent === 0)
                {
                    $matches[1] .= ' ';
                }

                $markerWithoutWhitespace = strstr($matches[1], ' ', true);

                $Block = array(
                    'indent' => $Line['indent'],
                    'pattern' => $pattern,
                    'data' => array(
                        'type' => $name,
                        'marker' => $matches[1],
                        'markerType' => ($name === 'ul' ? $markerWithoutWhitespace : substr($markerWithoutWhitespace, -1)),
                    ),
                    'element' => array(
                        'name' => $name,
                        'elements' => array(),
                    ),
                );
                $Block['data']['markerTypeRegex'] = preg_quote($Block['data']['markerType'], '/');

                if ($name === 'ol')
                {
                    $listStart = ltrim(strstr($matches[1], $Block['data']['markerType'], true), '0') ?: '0';

                    if ($listStart !== '1')
                    {
                        if (
                            isset($CurrentBlock)
                            and $CurrentBlock['type'] === 'Paragraph'
                            and ! isset($CurrentBlock['interrupted'])
                        ) {
                            return;
                        }

                        $Block['element']['attributes'] = array('start' => $listStart);
                    }
                }

                $Block['li'] = array(
                    'name' => 'li',
                    'handler' => array(
                        'function' => 'li',
                        'argument' => !empty($matches[3]) ? array($matches[3]) : array(),
                        'destination' => 'elements'
                    )
                );

                $Block['element']['elements'] []= & $Block['li'];

                return $Block;
            }
        }

        protected function blockListContinue($Line, array $Block)
        {
            if (isset($Block['interrupted']) and empty($Block['li']['handler']['argument']))
            {
                return null;
            }

            $requiredIndent = ($Block['indent'] + strlen($Block['data']['marker']));

            if ($Line['indent'] < $requiredIndent
                and (
                    (
                        $Block['data']['type'] === 'ol'
                        and preg_match('/^[0-9]++'.$Block['data']['markerTypeRegex'].'(?:[ ]++(.*)|$)/', $Line['text'], $matches)
                    ) or (
                        $Block['data']['type'] === 'ul'
                        and preg_match('/^'.$Block['data']['markerTypeRegex'].'(?:[ ]++(.*)|$)/', $Line['text'], $matches)
                    )
                )
            ) {
                if (isset($Block['interrupted']))
                {
                    $Block['li']['handler']['argument'] []= '';

                    $Block['loose'] = true;

                    unset($Block['interrupted']);
                }

                unset($Block['li']);

                $text = isset($matches[1]) ? $matches[1] : '';

                $Block['indent'] = $Line['indent'];

                $Block['li'] = array(
                    'name' => 'li',
                    'handler' => array(
                        'function' => 'li',
                        'argument' => array($text),
                        'destination' => 'elements'
                    )
                );

                $Block['element']['elements'] []= & $Block['li'];

                return $Block;
            }
            elseif ($Line['indent'] < $requiredIndent and $this->blockList($Line))
            {
                return null;
            }

            if ($Line['text'][0] === '[' and $this->blockReference($Line))
            {
                return $Block;
            }

            if ($Line['indent'] >= $requiredIndent)
            {
                if (isset($Block['interrupted']))
                {
                    $Block['li']['handler']['argument'] []= '';

                    $Block['loose'] = true;

                    unset($Block['interrupted']);
                }

                $text = substr($Line['body'], $requiredIndent);

                $Block['li']['handler']['argument'] []= $text;

                return $Block;
            }

            if ( ! isset($Block['interrupted']))
            {
                $text = preg_replace('/^[ ]{0,'.$requiredIndent.'}+/', '', $Line['body']);

                $Block['li']['handler']['argument'] []= $text;

                return $Block;
            }
        }

        protected function blockListComplete(array $Block)
        {
            if (isset($Block['loose']))
            {
                foreach ($Block['element']['elements'] as &$li)
                {
                    if (end($li['handler']['argument']) !== '')
                    {
                        $li['handler']['argument'] []= '';
                    }
                }
            }

            return $Block;
        }

        #
        # Quote

        protected function blockQuote($Line)
        {
            if (preg_match('/^>[ ]?+(.*+)/', $Line['text'], $matches))
            {
                $Block = array(
                    'element' => array(
                        'name' => 'blockquote',
                        'handler' => array(
                            'function' => 'linesElements',
                            'argument' => (array) $matches[1],
                            'destination' => 'elements',
                        )
                    ),
                );

                return $Block;
            }
        }

        protected function blockQuoteContinue($Line, array $Block)
        {
            if (isset($Block['interrupted']))
            {
                return;
            }

            if ($Line['text'][0] === '>' and preg_match('/^>[ ]?+(.*+)/', $Line['text'], $matches))
            {
                $Block['element']['handler']['argument'] []= $matches[1];

                return $Block;
            }

            if ( ! isset($Block['interrupted']))
            {
                $Block['element']['handler']['argument'] []= $Line['text'];

                return $Block;
            }
        }

        #
        # Rule

        protected function blockRule($Line)
        {
            $marker = $Line['text'][0];

            if (substr_count($Line['text'], $marker) >= 3 and chop($Line['text'], " $marker") === '')
            {
                $Block = array(
                    'element' => array(
                        'name' => 'hr',
                    ),
                );

                return $Block;
            }
        }

        #
        # Setext

        protected function blockSetextHeader($Line, ?array $Block = null)
        {
            if ( ! isset($Block) or $Block['type'] !== 'Paragraph' or isset($Block['interrupted']))
            {
                return;
            }

            if ($Line['indent'] < 4 and chop(chop($Line['text'], ' '), $Line['text'][0]) === '')
            {
                $Block['element']['name'] = $Line['text'][0] === '=' ? 'h1' : 'h2';

                return $Block;
            }
        }

        #
        # Markup

        protected function blockMarkup($Line)
        {
            if ($this->markupEscaped or $this->safeMode)
            {
                return;
            }

            if (preg_match('/^<[\/]?+(\w*)(?:[ ]*+'.$this->regexHtmlAttribute.')*+[ ]*+(\/)?>/', $Line['text'], $matches))
            {
                $element = strtolower($matches[1]);

                if (in_array($element, $this->textLevelElements))
                {
                    return;
                }

                $Block = array(
                    'name' => $matches[1],
                    'element' => array(
                        'rawHtml' => $Line['text'],
                        'autobreak' => true,
                    ),
                );

                return $Block;
            }
        }

        protected function blockMarkupContinue($Line, array $Block)
        {
            if (isset($Block['closed']) or isset($Block['interrupted']))
            {
                return;
            }

            $Block['element']['rawHtml'] .= "\n" . $Line['body'];

            return $Block;
        }

        #
        # Reference

        protected function blockReference($Line)
        {
            if (strpos($Line['text'], ']') !== false
                and preg_match('/^\[(.+?)\]:[ ]*+<?(\S+?)>?(?:[ ]+["\'(](.+)["\')])?[ ]*+$/', $Line['text'], $matches)
            ) {
                $id = strtolower($matches[1]);

                $Data = array(
                    'url' => $matches[2],
                    'title' => isset($matches[3]) ? $matches[3] : null,
                );

                $this->DefinitionData['Reference'][$id] = $Data;

                $Block = array(
                    'element' => array(),
                );

                return $Block;
            }
        }

        #
        # Table

        protected function blockTable($Line, ?array $Block = null)
        {
            if ( ! isset($Block) or $Block['type'] !== 'Paragraph' or isset($Block['interrupted']))
            {
                return;
            }

            if (
                strpos($Block['element']['handler']['argument'], '|') === false
                and strpos($Line['text'], '|') === false
                and strpos($Line['text'], ':') === false
                or strpos($Block['element']['handler']['argument'], "\n") !== false
            ) {
                return;
            }

            if (chop($Line['text'], ' -:|') !== '')
            {
                return;
            }

            $alignments = array();

            $divider = $Line['text'];

            $divider = trim($divider);
            $divider = trim($divider, '|');

            $dividerCells = explode('|', $divider);

            foreach ($dividerCells as $dividerCell)
            {
                $dividerCell = trim($dividerCell);

                if ($dividerCell === '')
                {
                    return;
                }

                $alignment = null;

                if ($dividerCell[0] === ':')
                {
                    $alignment = 'left';
                }

                if (substr($dividerCell, - 1) === ':')
                {
                    $alignment = $alignment === 'left' ? 'center' : 'right';
                }

                $alignments []= $alignment;
            }

            # ~

            $HeaderElements = array();

            $header = $Block['element']['handler']['argument'];

            $header = trim($header);
            $header = trim($header, '|');

            $headerCells = explode('|', $header);

            if (count($headerCells) !== count($alignments))
            {
                return;
            }

            foreach ($headerCells as $index => $headerCell)
            {
                $headerCell = trim($headerCell);

                $HeaderElement = array(
                    'name' => 'th',
                    'handler' => array(
                        'function' => 'lineElements',
                        'argument' => $headerCell,
                        'destination' => 'elements',
                    )
                );

                if (isset($alignments[$index]))
                {
                    $alignment = $alignments[$index];

                    $HeaderElement['attributes'] = array(
                        'style' => "text-align: $alignment;",
                    );
                }

                $HeaderElements []= $HeaderElement;
            }

            # ~

            $Block = array(
                'alignments' => $alignments,
                'identified' => true,
                'element' => array(
                    'name' => 'table',
                    'elements' => array(),
                ),
            );

            $Block['element']['elements'] []= array(
                'name' => 'thead',
            );

            $Block['element']['elements'] []= array(
                'name' => 'tbody',
                'elements' => array(),
            );

            $Block['element']['elements'][0]['elements'] []= array(
                'name' => 'tr',
                'elements' => $HeaderElements,
            );

            return $Block;
        }

        protected function blockTableContinue($Line, array $Block)
        {
            if (isset($Block['interrupted']))
            {
                return;
            }

            if (count($Block['alignments']) === 1 or $Line['text'][0] === '|' or strpos($Line['text'], '|'))
            {
                $Elements = array();

                $row = $Line['text'];

                $row = trim($row);
                $row = trim($row, '|');

                preg_match_all('/(?:(\\\\[|])|[^|`]|`[^`]++`|`)++/', $row, $matches);

                $cells = array_slice($matches[0], 0, count($Block['alignments']));

                foreach ($cells as $index => $cell)
                {
                    $cell = trim($cell);

                    $Element = array(
                        'name' => 'td',
                        'handler' => array(
                            'function' => 'lineElements',
                            'argument' => $cell,
                            'destination' => 'elements',
                        )
                    );

                    if (isset($Block['alignments'][$index]))
                    {
                        $Element['attributes'] = array(
                            'style' => 'text-align: ' . $Block['alignments'][$index] . ';',
                        );
                    }

                    $Elements []= $Element;
                }

                $Element = array(
                    'name' => 'tr',
                    'elements' => $Elements,
                );

                $Block['element']['elements'][1]['elements'] []= $Element;

                return $Block;
            }
        }

        #
        # ~
        #

        protected function paragraph($Line)
        {
            return array(
                'type' => 'Paragraph',
                'element' => array(
                    'name' => 'p',
                    'handler' => array(
                        'function' => 'lineElements',
                        'argument' => $Line['text'],
                        'destination' => 'elements',
                    ),
                ),
            );
        }

        protected function paragraphContinue($Line, array $Block)
        {
            if (isset($Block['interrupted']))
            {
                return;
            }

            $Block['element']['handler']['argument'] .= "\n".$Line['text'];

            return $Block;
        }

        #
        # Inline Elements
        #

        protected $InlineTypes = array(
            '!' => array('Image'),
            '&' => array('SpecialCharacter'),
            '*' => array('Emphasis'),
            ':' => array('Url'),
            '<' => array('UrlTag', 'EmailTag', 'Markup'),
            '[' => array('Link'),
            '_' => array('Emphasis'),
            '`' => array('Code'),
            '~' => array('Strikethrough'),
            '\\' => array('EscapeSequence'),
        );

        # ~

        protected $inlineMarkerList = '!*_&[:<`~\\';

        #
        # ~
        #

        public function line($text, $nonNestables = array())
        {
            return $this->elements($this->lineElements($text, $nonNestables));
        }

        protected function lineElements($text, $nonNestables = array())
        {
            # standardize line breaks
            $text = str_replace(array("\r\n", "\r"), "\n", $text);

            $Elements = array();

            $nonNestables = (empty($nonNestables)
                ? array()
                : array_combine($nonNestables, $nonNestables)
            );

            # $excerpt is based on the first occurrence of a marker

            while ($excerpt = strpbrk($text, $this->inlineMarkerList))
            {
                $marker = $excerpt[0];

                $markerPosition = strlen($text) - strlen($excerpt);

                $Excerpt = array('text' => $excerpt, 'context' => $text);

                foreach ($this->InlineTypes[$marker] as $inlineType)
                {
                    # check to see if the current inline type is nestable in the current context

                    if (isset($nonNestables[$inlineType]))
                    {
                        continue;
                    }

                    $Inline = $this->{"inline$inlineType"}($Excerpt);

                    if ( ! isset($Inline))
                    {
                        continue;
                    }

                    # makes sure that the inline belongs to "our" marker

                    if (isset($Inline['position']) and $Inline['position'] > $markerPosition)
                    {
                        continue;
                    }

                    # sets a default inline position

                    if ( ! isset($Inline['position']))
                    {
                        $Inline['position'] = $markerPosition;
                    }

                    # cause the new element to 'inherit' our non nestables


                    $Inline['element']['nonNestables'] = isset($Inline['element']['nonNestables'])
                        ? array_merge($Inline['element']['nonNestables'], $nonNestables)
                        : $nonNestables
                    ;

                    # the text that comes before the inline
                    $unmarkedText = substr($text, 0, $Inline['position']);

                    # compile the unmarked text
                    $InlineText = $this->inlineText($unmarkedText);
                    $Elements[] = $InlineText['element'];

                    # compile the inline
                    $Elements[] = $this->extractElement($Inline);

                    # remove the examined text
                    $text = substr($text, $Inline['position'] + $Inline['extent']);

                    continue 2;
                }

                # the marker does not belong to an inline

                $unmarkedText = substr($text, 0, $markerPosition + 1);

                $InlineText = $this->inlineText($unmarkedText);
                $Elements[] = $InlineText['element'];

                $text = substr($text, $markerPosition + 1);
            }

            $InlineText = $this->inlineText($text);
            $Elements[] = $InlineText['element'];

            foreach ($Elements as &$Element)
            {
                if ( ! isset($Element['autobreak']))
                {
                    $Element['autobreak'] = false;
                }
            }

            return $Elements;
        }

        #
        # ~
        #

        protected function inlineText($text)
        {
            $Inline = array(
                'extent' => strlen($text),
                'element' => array(),
            );

            $Inline['element']['elements'] = self::pregReplaceElements(
                $this->breaksEnabled ? '/[ ]*+\n/' : '/(?:[ ]*+\\\\|[ ]{2,}+)\n/',
                array(
                    array('name' => 'br'),
                    array('text' => "\n"),
                ),
                $text
            );

            return $Inline;
        }

        protected function inlineCode($Excerpt)
        {
            $marker = $Excerpt['text'][0];

            if (preg_match('/^(['.$marker.']++)[ ]*+(.+?)[ ]*+(?<!['.$marker.'])\1(?!'.$marker.')/s', $Excerpt['text'], $matches))
            {
                $text = $matches[2];
                $text = preg_replace('/[ ]*+\n/', ' ', $text);

                return array(
                    'extent' => strlen($matches[0]),
                    'element' => array(
                        'name' => 'code',
                        'text' => $text,
                    ),
                );
            }
        }

        protected function inlineEmailTag($Excerpt)
        {
            $hostnameLabel = '[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?';

            $commonMarkEmail = '[a-zA-Z0-9.!#$%&\'*+\/=?^_`{|}~-]++@'
                . $hostnameLabel . '(?:\.' . $hostnameLabel . ')*';

            if (strpos($Excerpt['text'], '>') !== false
                and preg_match("/^<((mailto:)?$commonMarkEmail)>/i", $Excerpt['text'], $matches)
            ){
                $url = $matches[1];

                if ( ! isset($matches[2]))
                {
                    $url = "mailto:$url";
                }

                return array(
                    'extent' => strlen($matches[0]),
                    'element' => array(
                        'name' => 'a',
                        'text' => $matches[1],
                        'attributes' => array(
                            'href' => $url,
                        ),
                    ),
                );
            }
        }

        protected function inlineEmphasis($Excerpt)
        {
            if ( ! isset($Excerpt['text'][1]))
            {
                return;
            }

            $marker = $Excerpt['text'][0];

            if ($Excerpt['text'][1] === $marker and preg_match($this->StrongRegex[$marker], $Excerpt['text'], $matches))
            {
                $emphasis = 'strong';
            }
            elseif (preg_match($this->EmRegex[$marker], $Excerpt['text'], $matches))
            {
                $emphasis = 'em';
            }
            else
            {
                return;
            }

            return array(
                'extent' => strlen($matches[0]),
                'element' => array(
                    'name' => $emphasis,
                    'handler' => array(
                        'function' => 'lineElements',
                        'argument' => $matches[1],
                        'destination' => 'elements',
                    )
                ),
            );
        }

        protected function inlineEscapeSequence($Excerpt)
        {
            if (isset($Excerpt['text'][1]) and in_array($Excerpt['text'][1], $this->specialCharacters))
            {
                return array(
                    'element' => array('rawHtml' => $Excerpt['text'][1]),
                    'extent' => 2,
                );
            }
        }

        protected function inlineImage($Excerpt)
        {
            if ( ! isset($Excerpt['text'][1]) or $Excerpt['text'][1] !== '[')
            {
                return;
            }

            $Excerpt['text']= substr($Excerpt['text'], 1);

            $Link = $this->inlineLink($Excerpt);

            if ($Link === null)
            {
                return;
            }

            $Inline = array(
                'extent' => $Link['extent'] + 1,
                'element' => array(
                    'name' => 'img',
                    'attributes' => array(
                        'src' => $Link['element']['attributes']['href'],
                        'alt' => $Link['element']['handler']['argument'],
                    ),
                    'autobreak' => true,
                ),
            );

            $Inline['element']['attributes'] += $Link['element']['attributes'];

            unset($Inline['element']['attributes']['href']);

            return $Inline;
        }

        protected function inlineLink($Excerpt)
        {
            $Element = array(
                'name' => 'a',
                'handler' => array(
                    'function' => 'lineElements',
                    'argument' => null,
                    'destination' => 'elements',
                ),
                'nonNestables' => array('Url', 'Link'),
                'attributes' => array(
                    'href' => null,
                    'title' => null,
                ),
            );

            $extent = 0;

            $remainder = $Excerpt['text'];

            if (preg_match('/\[((?:[^][]++|(?R))*+)\]/', $remainder, $matches))
            {
                $Element['handler']['argument'] = $matches[1];

                $extent += strlen($matches[0]);

                $remainder = substr($remainder, $extent);
            }
            else
            {
                return;
            }

            if (preg_match('/^[(]\s*+((?:[^ ()]++|[(][^ )]+[)])++)(?:[ ]+("[^"]*+"|\'[^\']*+\'))?\s*+[)]/', $remainder, $matches))
            {
                $Element['attributes']['href'] = $matches[1];

                if (isset($matches[2]))
                {
                    $Element['attributes']['title'] = substr($matches[2], 1, - 1);
                }

                $extent += strlen($matches[0]);
            }
            else
            {
                if (preg_match('/^\s*\[(.*?)\]/', $remainder, $matches))
                {
                    $definition = strlen($matches[1]) ? $matches[1] : $Element['handler']['argument'];
                    $definition = strtolower($definition);

                    $extent += strlen($matches[0]);
                }
                else
                {
                    $definition = strtolower($Element['handler']['argument']);
                }

                if ( ! isset($this->DefinitionData['Reference'][$definition]))
                {
                    return;
                }

                $Definition = $this->DefinitionData['Reference'][$definition];

                $Element['attributes']['href'] = $Definition['url'];
                $Element['attributes']['title'] = $Definition['title'];
            }

            return array(
                'extent' => $extent,
                'element' => $Element,
            );
        }

        protected function inlineMarkup($Excerpt)
        {
            if ($this->markupEscaped or $this->safeMode or strpos($Excerpt['text'], '>') === false)
            {
                return;
            }

            if ($Excerpt['text'][1] === '/' and preg_match('/^<\/\w[\w-]*+[ ]*+>/s', $Excerpt['text'], $matches))
            {
                return array(
                    'element' => array('rawHtml' => $matches[0]),
                    'extent' => strlen($matches[0]),
                );
            }

            if ($Excerpt['text'][1] === '!' and preg_match('/^<!---?[^>-](?:-?+[^-])*-->/s', $Excerpt['text'], $matches))
            {
                return array(
                    'element' => array('rawHtml' => $matches[0]),
                    'extent' => strlen($matches[0]),
                );
            }

            if ($Excerpt['text'][1] !== ' ' and preg_match('/^<\w[\w-]*+(?:[ ]*+'.$this->regexHtmlAttribute.')*+[ ]*+\/?>/s', $Excerpt['text'], $matches))
            {
                return array(
                    'element' => array('rawHtml' => $matches[0]),
                    'extent' => strlen($matches[0]),
                );
            }
        }

        protected function inlineSpecialCharacter($Excerpt)
        {
            if (substr($Excerpt['text'], 1, 1) !== ' ' and strpos($Excerpt['text'], ';') !== false
                and preg_match('/^&(#?+[0-9a-zA-Z]++);/', $Excerpt['text'], $matches)
            ) {
                return array(
                    'element' => array('rawHtml' => '&' . $matches[1] . ';'),
                    'extent' => strlen($matches[0]),
                );
            }

            return;
        }

        protected function inlineStrikethrough($Excerpt)
        {
            if ( ! isset($Excerpt['text'][1]))
            {
                return;
            }

            if ($Excerpt['text'][1] === '~' and preg_match('/^~~(?=\S)(.+?)(?<=\S)~~/', $Excerpt['text'], $matches))
            {
                return array(
                    'extent' => strlen($matches[0]),
                    'element' => array(
                        'name' => 'del',
                        'handler' => array(
                            'function' => 'lineElements',
                            'argument' => $matches[1],
                            'destination' => 'elements',
                        )
                    ),
                );
            }
        }

        protected function inlineUrl($Excerpt)
        {
            if ($this->urlsLinked !== true or ! isset($Excerpt['text'][2]) or $Excerpt['text'][2] !== '/')
            {
                return;
            }

            if (strpos($Excerpt['context'], 'http') !== false
                and preg_match('/\bhttps?+:[\/]{2}[^\s<]+\b\/*+/ui', $Excerpt['context'], $matches, PREG_OFFSET_CAPTURE)
            ) {
                $url = $matches[0][0];

                $Inline = array(
                    'extent' => strlen($matches[0][0]),
                    'position' => $matches[0][1],
                    'element' => array(
                        'name' => 'a',
                        'text' => $url,
                        'attributes' => array(
                            'href' => $url,
                        ),
                    ),
                );

                return $Inline;
            }
        }

        protected function inlineUrlTag($Excerpt)
        {
            if (strpos($Excerpt['text'], '>') !== false and preg_match('/^<(\w++:\/{2}[^ >]++)>/i', $Excerpt['text'], $matches))
            {
                $url = $matches[1];

                return array(
                    'extent' => strlen($matches[0]),
                    'element' => array(
                        'name' => 'a',
                        'text' => $url,
                        'attributes' => array(
                            'href' => $url,
                        ),
                    ),
                );
            }
        }

        # ~

        protected function unmarkedText($text)
        {
            $Inline = $this->inlineText($text);
            return $this->element($Inline['element']);
        }

        #
        # Handlers
        #

        protected function handle(array $Element)
        {
            if (isset($Element['handler']))
            {
                if (!isset($Element['nonNestables']))
                {
                    $Element['nonNestables'] = array();
                }

                if (is_string($Element['handler']))
                {
                    $function = $Element['handler'];
                    $argument = $Element['text'];
                    unset($Element['text']);
                    $destination = 'rawHtml';
                }
                else
                {
                    $function = $Element['handler']['function'];
                    $argument = $Element['handler']['argument'];
                    $destination = $Element['handler']['destination'];
                }

                $Element[$destination] = $this->{$function}($argument, $Element['nonNestables']);

                if ($destination === 'handler')
                {
                    $Element = $this->handle($Element);
                }

                unset($Element['handler']);
            }

            return $Element;
        }

        protected function handleElementRecursive(array $Element)
        {
            return $this->elementApplyRecursive(array($this, 'handle'), $Element);
        }

        protected function handleElementsRecursive(array $Elements)
        {
            return $this->elementsApplyRecursive(array($this, 'handle'), $Elements);
        }

        protected function elementApplyRecursive($closure, array $Element)
        {
            $Element = call_user_func($closure, $Element);

            if (isset($Element['elements']))
            {
                $Element['elements'] = $this->elementsApplyRecursive($closure, $Element['elements']);
            }
            elseif (isset($Element['element']))
            {
                $Element['element'] = $this->elementApplyRecursive($closure, $Element['element']);
            }

            return $Element;
        }

        protected function elementApplyRecursiveDepthFirst($closure, array $Element)
        {
            if (isset($Element['elements']))
            {
                $Element['elements'] = $this->elementsApplyRecursiveDepthFirst($closure, $Element['elements']);
            }
            elseif (isset($Element['element']))
            {
                $Element['element'] = $this->elementsApplyRecursiveDepthFirst($closure, $Element['element']);
            }

            $Element = call_user_func($closure, $Element);

            return $Element;
        }

        protected function elementsApplyRecursive($closure, array $Elements)
        {
            foreach ($Elements as &$Element)
            {
                $Element = $this->elementApplyRecursive($closure, $Element);
            }

            return $Elements;
        }

        protected function elementsApplyRecursiveDepthFirst($closure, array $Elements)
        {
            foreach ($Elements as &$Element)
            {
                $Element = $this->elementApplyRecursiveDepthFirst($closure, $Element);
            }

            return $Elements;
        }

        protected function element(array $Element)
        {
            if ($this->safeMode)
            {
                $Element = $this->sanitiseElement($Element);
            }

            # identity map if element has no handler
            $Element = $this->handle($Element);

            $hasName = isset($Element['name']);

            $markup = '';

            if ($hasName)
            {
                $markup .= '<' . $Element['name'];

                if (isset($Element['attributes']))
                {
                    foreach ($Element['attributes'] as $name => $value)
                    {
                        if ($value === null)
                        {
                            continue;
                        }

                        $markup .= " $name=\"".self::escape($value).'"';
                    }
                }
            }

            $permitRawHtml = false;

            if (isset($Element['text']))
            {
                $text = $Element['text'];
            }
            // very strongly consider an alternative if you're writing an
            // extension
            elseif (isset($Element['rawHtml']))
            {
                $text = $Element['rawHtml'];

                $allowRawHtmlInSafeMode = isset($Element['allowRawHtmlInSafeMode']) && $Element['allowRawHtmlInSafeMode'];
                $permitRawHtml = !$this->safeMode || $allowRawHtmlInSafeMode;
            }

            $hasContent = isset($text) || isset($Element['element']) || isset($Element['elements']);

            if ($hasContent)
            {
                $markup .= $hasName ? '>' : '';

                if (isset($Element['elements']))
                {
                    $markup .= $this->elements($Element['elements']);
                }
                elseif (isset($Element['element']))
                {
                    $markup .= $this->element($Element['element']);
                }
                else
                {
                    if (!$permitRawHtml)
                    {
                        $markup .= self::escape($text, true);
                    }
                    else
                    {
                        $markup .= $text;
                    }
                }

                $markup .= $hasName ? '</' . $Element['name'] . '>' : '';
            }
            elseif ($hasName)
            {
                $markup .= ' />';
            }

            return $markup;
        }

        protected function elements(array $Elements)
        {
            $markup = '';

            $autoBreak = true;

            foreach ($Elements as $Element)
            {
                if (empty($Element))
                {
                    continue;
                }

                $autoBreakNext = (isset($Element['autobreak'])
                    ? $Element['autobreak'] : isset($Element['name'])
                );
                // (autobreak === false) covers both sides of an element
                $autoBreak = !$autoBreak ? $autoBreak : $autoBreakNext;

                $markup .= ($autoBreak ? "\n" : '') . $this->element($Element);
                $autoBreak = $autoBreakNext;
            }

            $markup .= $autoBreak ? "\n" : '';

            return $markup;
        }

        # ~

        protected function li($lines)
        {
            $Elements = $this->linesElements($lines);

            if ( ! in_array('', $lines)
                and isset($Elements[0]) and isset($Elements[0]['name'])
                and $Elements[0]['name'] === 'p'
            ) {
                unset($Elements[0]['name']);
            }

            return $Elements;
        }

        #
        # AST Convenience
        #

        /**
         * Replace occurrences $regexp with $Elements in $text. Return an array of
         * elements representing the replacement.
         */
        protected static function pregReplaceElements($regexp, $Elements, $text)
        {
            $newElements = array();

            while (preg_match($regexp, $text, $matches, PREG_OFFSET_CAPTURE))
            {
                $offset = $matches[0][1];
                $before = substr($text, 0, $offset);
                $after = substr($text, $offset + strlen($matches[0][0]));

                $newElements[] = array('text' => $before);

                foreach ($Elements as $Element)
                {
                    $newElements[] = $Element;
                }

                $text = $after;
            }

            $newElements[] = array('text' => $text);

            return $newElements;
        }

        #
        # Deprecated Methods
        #

        function parse($text)
        {
            $markup = $this->text($text);

            return $markup;
        }

        protected function sanitiseElement(array $Element)
        {
            static $goodAttribute = '/^[a-zA-Z0-9][a-zA-Z0-9-_]*+$/';
            static $safeUrlNameToAtt  = array(
                'a'   => 'href',
                'img' => 'src',
            );

            if ( ! isset($Element['name']))
            {
                unset($Element['attributes']);
                return $Element;
            }

            if (isset($safeUrlNameToAtt[$Element['name']]))
            {
                $Element = $this->filterUnsafeUrlInAttribute($Element, $safeUrlNameToAtt[$Element['name']]);
            }

            if ( ! empty($Element['attributes']))
            {
                foreach ($Element['attributes'] as $att => $val)
                {
                    # filter out badly parsed attribute
                    if ( ! preg_match($goodAttribute, $att))
                    {
                        unset($Element['attributes'][$att]);
                    }
                    # dump onevent attribute
                    elseif (self::striAtStart($att, 'on'))
                    {
                        unset($Element['attributes'][$att]);
                    }
                }
            }

            return $Element;
        }

        protected function filterUnsafeUrlInAttribute(array $Element, $attribute)
        {
            foreach ($this->safeLinksWhitelist as $scheme)
            {
                if (self::striAtStart($Element['attributes'][$attribute], $scheme))
                {
                    return $Element;
                }
            }

            $Element['attributes'][$attribute] = str_replace(':', '%3A', $Element['attributes'][$attribute]);

            return $Element;
        }

        #
        # Static Methods
        #

        protected static function escape($text, $allowQuotes = false)
        {
            return htmlspecialchars($text, $allowQuotes ? ENT_NOQUOTES : ENT_QUOTES, 'UTF-8');
        }

        protected static function striAtStart($string, $needle)
        {
            $len = strlen($needle);

            if ($len > strlen($string))
            {
                return false;
            }
            else
            {
                return strtolower(substr($string, 0, $len)) === strtolower($needle);
            }
        }

        static function instance($name = 'default')
        {
            if (isset(self::$instances[$name]))
            {
                return self::$instances[$name];
            }

            $instance = new static();

            self::$instances[$name] = $instance;

            return $instance;
        }

        private static $instances = array();

        #
        # Fields
        #

        protected $DefinitionData;

        #
        # Read-Only

        protected $specialCharacters = array(
            '\\', '`', '*', '_', '{', '}', '[', ']', '(', ')', '>', '#', '+', '-', '.', '!', '|', '~'
        );

        protected $StrongRegex = array(
            '*' => '/^[*]{2}((?:\\\\\*|[^*]|[*][^*]*+[*])+?)[*]{2}(?![*])/s',
            '_' => '/^__((?:\\\\_|[^_]|_[^_]*+_)+?)__(?!_)/us',
        );

        protected $EmRegex = array(
            '*' => '/^[*]((?:\\\\\*|[^*]|[*][*][^*]+?[*][*])+?)[*](?![*])/s',
            '_' => '/^_((?:\\\\_|[^_]|__[^_]*__)+?)_(?!_)\b/us',
        );

        protected $regexHtmlAttribute = '[a-zA-Z_:][\w:.-]*+(?:\s*+=\s*+(?:[^"\'=<>`\s]+|"[^"]*+"|\'[^\']*+\'))?+';

        protected $voidElements = array(
            'area', 'base', 'br', 'col', 'command', 'embed', 'hr', 'img', 'input', 'link', 'meta', 'param', 'source',
        );

        protected $textLevelElements = array(
            'a', 'br', 'bdo', 'abbr', 'blink', 'nextid', 'acronym', 'basefont',
            'b', 'em', 'big', 'cite', 'small', 'spacer', 'listing',
            'i', 'rp', 'del', 'code',          'strike', 'marquee',
            'q', 'rt', 'ins', 'font',          'strong',
            's', 'tt', 'kbd', 'mark',
            'u', 'xm', 'sub', 'nobr',
                    'sup', 'ruby',
                    'var', 'span',
                    'wbr', 'time',
        );
    }
}
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