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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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التكنولوجيا تغزو الأعصاب..زراعة الشرائح الدماغية و مخاطرها – tahkoom.com
كتبت إيريني أنطون
لم يعد الذكاء الاصطناعي مجرد أداة تساعد الأطباء في التشخيص والعلاج، بل بات يمتد إلى أدمغتنا نفسها، فاتحًا الباب أمام إمكانيات غير مسبوقة، وأيضًا مخاوف وتساؤلات لا حصر لها. يعمل العلماء على تطوير شرائح تزرع داخل الدماغ، قادرة على إعادة الحركة لمرضى الشلل، وتحسين حالات الاكتئاب والقلق، بل وحتى استعادة الذاكرة لمن يعانون من أمراض مثل الزهايمر. فهل نحن على أعتاب ثورة طبية تعيد تشكيل قدراتنا العقلية؟ أم أن هذه التكنولوجيا قد تحمل مخاطر أكبر مما نتخيل؟
تكنولوجيا الشرائح الدماغية لا تزال في مراحلها الأولى عالميًا، وفي مصر بدأ الأطباء في متابعة أحدث التطورات العالمية في زراعة الشرائح الدماغية على أمل توفيرها لمرضى فقدان الحركة أو الاضطرابات النفسية.
“الشرائح الدماغية: أمل للمرضى”
قالت دكتورة ماريا ألفي، أخصائية أمراض مخ وأعصاب بالقصر العيني: “هذه الشرائح تُستخدم في علاج أمراض مثل الشلل، والشلل الرعاش، وبعض أمراض الذاكرة، والأمراض النفسية، والتشنجات، ويتم تطويرها لاستعادة الوظائف الحسية والحركية. ولكن حتى الآن، لن تصل هذه التكنولوجيا إلى مصر لأنها مازالت تحت التجارب والدراسات في الخارج”.
وأوضحت دكتورة ماريا ألفي أن هذه الشرائح تعمل على تسجيل الإشارات العصبية من الدماغ وتحويلها إلى أوامر للأجهزة المستخدمة مثل الأطراف الصناعية، فيتحكم بها المريض من خلال أفكاره. وأضافت أن هناك تجارب حاليًا لتحويل الإشارات العصبية المرتبطة بالكلام إلى نصوص أو أصوات، مما يعطي أملًا كبيرًا لمرضى فقدان النطق.
التحديات والمخاطر
قال الدكتور بولا جرجس، جراح مخ وأعصاب ونائب رئيس جراحة المخ والأعصاب بالقصر العيني سابقًا: “هناك تحديات تقنية وطبية تجعل هذه التكنولوجيا غير بديلة للعلاجات التقليدية في الوقت الحالي، لكنها يمكن أن تقلل من الحاجة للأدوية في بعض الحالات”.
وأوضح د. بولا جرجس أن لهذه الشرائح مضاعفات ومخاطر، من بينها تليف الأنسجة المحيطة بالشريحة، والنزيف الدماغي أثناء الجراحة أو بعدها، والعدوى التي قد تؤدي إلى إزالة الشريحة مع احتمالية حدوث اضطراب في كهرباء المخ. بالإضافة إلى أن هذه الشرائح قد تؤثر على المزاج والسلوك وتحدث تغيرات في التفكير والعاطفة.
مستقبل الشرائح الدماغية في مصر
أضاف د. بولا جرجس أن هناك مستشفيات متقدمة جدًا في مصر مثل القصر العيني، ومستشفى عين شمس التخصصي، ومعهد ناصر، قادرة على إجراء هذه العمليات بمجرد الانتهاء من مراحل البحث العالمية ووصول هذه التقنيات والأبحاث إلى مصر. وأوضح أن عمليات التحفيز العميق تُجرى في مصر لمرضى اضطرابات الحركة ومرضى باركنسون، لكن الشرائح لم تُستخدم حتى الآن.
واختتمت د. ماريا حديثها بقولها: “من المتوقع في المستقبل أن تصبح هذه الشرائح أكثر كفاءة، ويتم التحكم فيها لاسلكيًا، مما سيسمح للمرضى باستخدامها بسهولة أكبر. ودمجها بالذكاء الاصطناعي سيساعد في تفاعلها مع الإشارات العصبية، مما يجعلها أكثر دقة وفعالية”.
لا شك أن الشرائح الدماغية تمثل قفزة هائلة في عالم الطب العصبي، وقد تحمل مستقبلاً مشرقًا لملايين المرضى حول العالم. ومع ذلك، فإن التحديات التقنية والطبية لا تزال قائمة، مما يجعل هذه التكنولوجيا بحاجة إلى مزيد من الأبحاث قبل أن تصبح متاحة على نطاق واسع.
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