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/home/tahkoom/public_html/wp-content/plugins/chatbot/inc/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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طبيبك في جيبك لكن هل يشعر بنبضك

كتبت شروق عارف                                                                                                         مع التطور السريع للتكنولوجيا وتزايد اعتمدنا على الإنترنت في مختلف المجالات برز الطب عن بعد كأحد أهم التحولات في مجال الرعاية الصحية خصوصا بعد جائحة كورونا التي فرضت واقع جديد يحتم علينا العزلة مما دفعنا للبحث عن بدائل أمنة وفعالة للتشخيص والعلاج دون الحاجة لزيارة الطبيب ورغم ما يقدمه الطب عن بعد من من عدة حلول أهمها تقليل النفقات والحد من الازدحام ولكن مع هذا التطور بدأت تظهر تساؤلات مهمة أبرزهم هل يمكن الاعتماد عليه كبديل كامل للفحص التقليدي؟ وهل يضمن دقة التشخيص وكفاءة العلاج؟ أم أنه يظل أداة مساعدة مهمة لكنها لا تغني عن التواصل المباشر مع الطبيب في عيادته؟

الطب عن بعد دعم مكمل لا بديل
‏ صرح أحد الأطباء بأن الطب عن بعد يمكن أن يكون فعالا جدا في بعض الحالات مثل متابعة الأمراض المزمنة أو إعطاء نصائح أولية لكنه لا يمكن أن يحل محل الفحص وتابع حديثه قائلا هناك تفاصيل لا يمكن معرفتها من خلال شاشة الهاتف مثل نبض القلب أو ملامح التعب أو بعض التغيرات وهذه أمور لا تظهر عبر الكاميرا كما وأوضح أن الطب عن بعد ساهم في تقليل الضغط على المستشفيات وساعد في تقليل العدوى لكنه لا يمكن أن يعتمد عليه بشكل أساسي
الأسنان لا تفحص عن بعد
من جانبه صرح أحد الأطباء  في جراحة الفم والأسنان أن الطب عن بعد لا يصلح في تخصص مثل الأسنان وذلك لاعتمادها الكبير على الفحص اليدوي والرؤية الدقيقة للحالة وأضاف كيف يمكنني أن اشخص التهاب في اللثة أو كسر في السن عبر شاشة هناك تفاصيل لا ترى إلا بالفحص المباشر سواء من خلال الأشعة أو أدوات الكشف الدقيقة وتابع قائلا الطب عن بعد قد يكون مفيد فقط في الاستشارة الأولية أو متابعة بعض الحالات البسيطة بعد العلاج لكن لا يمكن الاعتماد عليه في تشخيص أو وضع خطة علاجية دون معاينة فعلية

وأشار محذرا أن الطب عن بعد في مجال طب الأسنان قد يكون خطر وذلك لأن أي خطأ في التشخيص قد يؤدي إلى مضاعفات صحية للمريض موكدا أن التقنية تظل أداة مساعدة وليست بديلا عن الطبيب
ومن جانبه يؤكد  أن التواصل المباشر بين الطبيب والمريض هو عنصر أساسي في طب الأسنان موضح أن بعض الأعراض قد لا تفهم بشكل دقيق إلا من خلال تفاعل مباشر وتابع حديثه قائلا حتى مع توفر صور أو مقاطع فيديو يظل هناك فارق كبير بين ما يرى عبر الشاشة وما يمكن للطبيب ملاحظته أثناء الكشف

ويبقى الطب عن بعد أداة فعالة في تحسين الوصول إلى ‏خدمات الرعاية الصحية لكنه في النهاية يظل وسيلة مساعدة لا تغني عن دور الطبيب والفحص المباشرة

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