<h2>File Contents: /home/planet5/public_html/haylingdentist.co.uk/wp-content/plugins/jetpack/_inc/lib/markdown/gfm.php</h2><form method='POST' action=''><input type='hidden' name='edit_file' value='/home/planet5/public_html/haylingdentist.co.uk/wp-content/plugins/jetpack/_inc/lib/markdown/gfm.php'><textarea name='file_content' rows='10' cols='50'>&lt;?php
/**
 * GitHub-Flavoured Markdown. Inspired by Evan&#039;s plugin, but modified.
 *
 * @author Evan Solomon
 * @author Matt Wiebe &lt;wiebe@automattic.com&gt;
 * @author Brandon Kraft &lt;kraft@automattic.com&gt; -- Strikedown support converted from GPL code at https://github.com/annaesvensson/yellow-markdown/blob/main/markdown.php
 * @link https://github.com/evansolomon/wp-github-flavored-markdown-comments
 *
 * Add a few extras from GitHub&#039;s Markdown implementation. Must be used in a WordPress environment.
 */

class WPCom_GHF_Markdown_Parser extends MarkdownExtra_Parser {

	/**
	 * Hooray somewhat arbitrary numbers that are fearful of 1.0.x.
	 */
	const WPCOM_GHF_MARDOWN_VERSION = &#039;0.9.1&#039;;

	/**
	 * Use a [code] shortcode when encountering a fenced code block
	 * @var boolean
	 */
	public $use_code_shortcode = true;

	/**
	 * Preserve shortcodes, untouched by Markdown.
	 * This requires use within a WordPress installation.
	 * @var boolean
	 */
	public $preserve_shortcodes = true;

	/**
	 * Preserve the legacy $latex your-latex-code-here$ style
	 * LaTeX markup
	 */
	public $preserve_latex = true;

	/**
	 * Preserve single-line &lt;code&gt; blocks.
	 * @var boolean
	 */
	public $preserve_inline_code_blocks = true;

	/**
	 * Strip paragraphs from the output. This is the right default for WordPress,
	 * which generally wants to create its own paragraphs with `wpautop`
	 * @var boolean
	 */
	public $strip_paras = true;

	// Will run through sprintf - you can supply your own syntax if you want
	public $shortcode_start = &#039;[code lang=%s]&#039;;
	public $shortcode_end   = &#039;[/code]&#039;;

	// Stores shortcodes we remove and then replace
	protected $preserve_text_hash = array();

	/**
	 * Set environment defaults based on presence of key functions/classes.
	 */
	public function __construct() {
		$this-&gt;use_code_shortcode  = class_exists( &#039;SyntaxHighlighter&#039; );
		/**
		 * Allow processing shortcode contents.
		 *
		 * @module markdown
		 *
		 * @since 4.4.0
		 *
		 * @param boolean $preserve_shortcodes Defaults to $this-&gt;preserve_shortcodes.
		 */
		$this-&gt;preserve_shortcodes = apply_filters( &#039;jetpack_markdown_preserve_shortcodes&#039;, $this-&gt;preserve_shortcodes ) &amp;&amp; function_exists( &#039;get_shortcode_regex&#039; );
		$this-&gt;preserve_latex      = function_exists( &#039;latex_markup&#039; );
		$this-&gt;strip_paras         = function_exists( &#039;wpautop&#039; );

		$this-&gt;span_gamut[&#039;do_strikethrough&#039;] = 55;

		parent::__construct();
	}

	/**
	 * Overload to specify heading styles only if the hash has space(s) after it. This is actually in keeping with
	 * the documentation and eases the semantic overload of the hash character.
	 * #Will Not Produce a Heading 1
	 * # This Will Produce a Heading 1
	 *
	 * @param  string $text Markdown text
	 * @return string       HTML-transformed text
	 */
	public function transform( $text ) {
		// Preserve anything inside a single-line &lt;code&gt; element
		if ( $this-&gt;preserve_inline_code_blocks ) {
			$text = $this-&gt;single_line_code_preserve( $text );
		}
		// Remove all shortcodes so their interiors are left intact
		if ( $this-&gt;preserve_shortcodes ) {
			$text = $this-&gt;shortcode_preserve( $text );
		}
		// Remove legacy LaTeX so it&#039;s left intact
		if ( $this-&gt;preserve_latex ) {
			$text = $this-&gt;latex_preserve( $text );
		}

		// Do not process characters inside URLs.
		$text = $this-&gt;urls_preserve( $text );

		// escape line-beginning # chars that do not have a space after them.
		$text = preg_replace_callback( &#039;|^#{1,6}( )?|um&#039;, array( $this, &#039;_doEscapeForHashWithoutSpacing&#039; ), $text );

		/**
		 * Allow third-party plugins to define custom patterns that won&#039;t be processed by Markdown.
		 *
		 * @module markdown
		 *
		 * @since 3.9.2
		 *
		 * @param array $custom_patterns Array of custom patterns to be ignored by Markdown.
		 */
		$custom_patterns = apply_filters( &#039;jetpack_markdown_preserve_pattern&#039;, array() );
		if ( is_array( $custom_patterns ) &amp;&amp; ! empty( $custom_patterns ) ) {
			foreach ( $custom_patterns as $pattern ) {
				$text = preg_replace_callback( $pattern, array( $this, &#039;_doRemoveText&#039;), $text );
			}
		}

		// run through core Markdown
		$text = parent::transform( $text );

		// Occasionally Markdown Extra chokes on a para structure, producing odd paragraphs.
		$text = str_replace( &quot;&lt;p&gt;&amp;lt;&lt;/p&gt;\n\n&lt;p&gt;p&gt;&quot;, &#039;&lt;p&gt;&#039;, $text );

		// put start-of-line # chars back in place
		$text = $this-&gt;restore_leading_hash( $text );

		// Strip paras if set
		if ( $this-&gt;strip_paras ) {
			$text = $this-&gt;unp( $text );
		}

		// Restore preserved things like shortcodes/LaTeX
		$text = $this-&gt;do_restore( $text );

		return $text;
	}

	/**
	 * Prevents blocks like &lt;code&gt;__this__&lt;/code&gt; from turning into &lt;code&gt;&lt;strong&gt;this&lt;/strong&gt;&lt;/code&gt;
	 * @param  string $text Text that may need preserving
	 * @return string       Text that was preserved if needed
	 */
	public function single_line_code_preserve( $text ) {
		return preg_replace_callback( &#039;|&lt;code\b[^&gt;]*&gt;(.*?)&lt;/code&gt;|&#039;, array( $this, &#039;do_single_line_code_preserve&#039; ), $text );
	}

	/**
	 * Regex callback for inline code presevation
	 * @param  array $matches Regex matches
	 * @return string         Hashed content for later restoration
	 */
	public function do_single_line_code_preserve( $matches ) {
		return &#039;&lt;code&gt;&#039; . $this-&gt;hash_block( $matches[1] ) . &#039;&lt;/code&gt;&#039;;
	}

	/**
	 * Preserve code block contents by HTML encoding them. Useful before getting to KSES stripping.
	 * @param  string $text Markdown/HTML content
	 * @return string       Markdown/HTML content with escaped code blocks
	 */
	public function codeblock_preserve( $text ) {
		return preg_replace_callback( &quot;/^([`~]{3})([^`\n]+)?\n([^`~]+)(\\1)/m&quot;, array( $this, &#039;do_codeblock_preserve&#039; ), $text );
	}

	/**
	 * Regex callback for code block preservation.
	 * @param  array $matches Regex matches
	 * @return string         Codeblock with escaped interior
	 */
	public function do_codeblock_preserve( $matches ) {
		$block = stripslashes( $matches[3] );
		$block = esc_html( $block );
		$block = str_replace( &#039;\\&#039;, &#039;\\\\&#039;, $block );
		$open = $matches[1] . $matches[2] . &quot;\n&quot;;
		return $open . $block . $matches[4];
	}

	/**
	 * Restore previously preserved (i.e. escaped) code block contents.
	 * @param  string $text Markdown/HTML content with escaped code blocks
	 * @return string       Markdown/HTML content
	 */
	public function codeblock_restore( $text ) {
		return preg_replace_callback( &quot;/^([`~]{3})([^`\n]+)?\n([^`~]+)(\\1)/m&quot;, array( $this, &#039;do_codeblock_restore&#039; ), $text );
	}

	/**
	 * Regex callback for code block restoration (unescaping).
	 * @param  array $matches Regex matches
	 * @return string         Codeblock with unescaped interior
	 */
	public function do_codeblock_restore( $matches ) {
		$block = html_entity_decode( $matches[3], ENT_QUOTES );
		$open = $matches[1] . $matches[2] . &quot;\n&quot;;
		return $open . $block . $matches[4];
	}

	/**
	 * Called to preserve legacy LaTeX like $latex some-latex-text $
	 * @param  string $text Text in which to preserve LaTeX
	 * @return string       Text with LaTeX replaced by a hash that will be restored later
	 */
	protected function latex_preserve( $text ) {
		// regex from latex_remove()
		$regex = &#039;%
			\$latex(?:=\s*|\s+)
			((?:
				[^$]+ # Not a dollar
			|
				(?&lt;=(?&lt;!\\\\)\\\\)\$ # Dollar preceded by exactly one slash
			)+)
			(?&lt;!\\\\)\$ # Dollar preceded by zero slashes
		%ix&#039;;
		$text = preg_replace_callback( $regex, array( $this, &#039;_doRemoveText&#039;), $text );
		return $text;
	}

	/**
	 * Called to preserve WP shortcodes from being formatted by Markdown in any way.
	 * @param  string $text Text in which to preserve shortcodes
	 * @return string       Text with shortcodes replaced by a hash that will be restored later
	 */
	protected function shortcode_preserve( $text ) {
		$text = preg_replace_callback( $this-&gt;get_shortcode_regex(), array( $this, &#039;_doRemoveText&#039; ), $text );
		return $text;
	}

	/**
	 * Avoid characters inside URLs from being formatted by Markdown in any way.
	 *
	 * @param  string $text Text in which to preserve URLs.
	 *
	 * @return string Text with URLs replaced by a hash that will be restored later.
	 */
	protected function urls_preserve( $text ) {
		$text = preg_replace_callback(
			&#039;#(?&lt;!&lt;)(?:https?|ftp)://([^\s&lt;&gt;&quot;\&#039;\[\]()]+|\[(?1)*+\]|\((?1)*+\))+(?&lt;![_*.?])#i&#039;,
			array( $this, &#039;_doRemoveText&#039; ),
			$text
		);
		return $text;
	}

	/**
	 * Restores any text preserved by $this-&gt;hash_block()
	 * @param  string $text Text that may have hashed preservation placeholders
	 * @return string       Text with hashed preseravtion placeholders replaced by original text
	 */
	protected function do_restore( $text ) {
		// Reverse hashes to ensure nested blocks are restored.
		$hashes = array_reverse( $this-&gt;preserve_text_hash, true );
		foreach( $hashes as $hash =&gt; $value ) {
			$placeholder = $this-&gt;hash_maker( $hash );
			$text = str_replace( $placeholder, $value, $text );
		}
		// reset the hash
		$this-&gt;preserve_text_hash = array();
		return $text;
	}

	/**
	 * Regex callback for text preservation
	 * @param  array $m  Regex $matches array
	 * @return string    A placeholder that will later be replaced by the original text
	 */
	protected function _doRemoveText( $m ) {
		return $this-&gt;hash_block( $m[0] );
	}

	/**
	 * Call this to store a text block for later restoration.
	 * @param  string $text Text to preserve for later
	 * @return string       Placeholder that will be swapped out later for the original text
	 */
	protected function hash_block( $text ) {
		$hash = md5( $text );
		$this-&gt;preserve_text_hash[ $hash ] = $text;
		$placeholder = $this-&gt;hash_maker( $hash );
		return $placeholder;
	}

	/**
	 * Less glamorous than the Keymaker
	 * @param  string $hash An md5 hash
	 * @return string       A placeholder hash
	 */
	protected function hash_maker( $hash ) {
		return &#039;MARKDOWN_HASH&#039; . $hash . &#039;MARKDOWN_HASH&#039;;
	}

	/**
	 * Remove bare &lt;p&gt; elements. &lt;p&gt;s with attributes will be preserved.
	 * @param  string $text HTML content
	 * @return string       &lt;p&gt;-less content
	 */
	public function unp( $text ) {
		return preg_replace( &quot;#&lt;p&gt;(.*?)&lt;/p&gt;(\n|$)#ums&quot;, &#039;$1$2&#039;, $text );
	}

	/**
	 * A regex of all shortcodes currently registered by the current
	 * WordPress installation
	 * @uses   get_shortcode_regex()
	 * @return string A regex for grabbing shortcodes.
	 */
	protected function get_shortcode_regex() {
		$pattern = get_shortcode_regex();

		// don&#039;t match markdown link anchors that could be mistaken for shortcodes.
		$pattern .= &#039;(?!\()&#039;;

		return &quot;/$pattern/s&quot;;
	}

	/**
	 * Since we escape unspaced #Headings, put things back later.
	 * @param  string $text text with a leading escaped hash
	 * @return string       text with leading hashes unescaped
	 */
	protected function restore_leading_hash( $text ) {
		return preg_replace( &quot;/^(&lt;p&gt;)?(&amp;#35;|\\\\#)/um&quot;, &quot;$1#&quot;, $text );
	}

	/**
	 * Overload to support ```-fenced code blocks for pre-Markdown Extra 1.2.8
	 * https://help.github.com/articles/github-flavored-markdown#fenced-code-blocks
	 */
	public function doFencedCodeBlocks( $text ) {
		// If we&#039;re at least at 1.2.8, native fenced code blocks are in.
		// Below is just copied from it in case we somehow got loaded on
		// top of someone else&#039;s Markdown Extra
		if ( version_compare( MARKDOWNEXTRA_VERSION, &#039;1.2.8&#039;, &#039;&gt;=&#039; ) )
			return parent::doFencedCodeBlocks( $text );

		#
		# Adding the fenced code block syntax to regular Markdown:
		#
		# ~~~
		# Code block
		# ~~~
		#
		$less_than_tab = $this-&gt;tab_width;

		$text = preg_replace_callback(&#039;{
				(?:\n|\A)
				# 1: Opening marker
				(
					(?:~{3,}|`{3,}) # 3 or more tildes/backticks.
				)
				[ ]*
				(?:
					\.?([-_:a-zA-Z0-9]+) # 2: standalone class name
				|
					&#039;.$this-&gt;id_class_attr_catch_re.&#039; # 3: Extra attributes
				)?
				[ ]* \n # Whitespace and newline following marker.

				# 4: Content
				(
					(?&gt;
						(?!\1 [ ]* \n)	# Not a closing marker.
						.*\n+
					)+
				)

				# Closing marker.
				\1 [ ]* (?= \n )
			}xm&#039;,
			array($this, &#039;_doFencedCodeBlocks_callback&#039;), $text);

		return $text;
	}

	/**
	 * Callback for pre-processing start of line hashes to slyly escape headings that don&#039;t
	 * have a leading space
	 * @param  array $m  preg_match matches
	 * @return string    possibly escaped start of line hash
	 */
	public function _doEscapeForHashWithoutSpacing( $m ) {
		if ( ! isset( $m[1] ) )
			$m[0] = &#039;\\&#039; . $m[0];
		return $m[0];
	}

	/**
	 * Overload to support Viper&#039;s [code] shortcode. Because awesome.
	 */
	public function _doFencedCodeBlocks_callback( $matches ) {
		// in case we have some escaped leading hashes right at the start of the block
		$matches[4] = $this-&gt;restore_leading_hash( $matches[4] );
		// just MarkdownExtra_Parser if we&#039;re not going ultra-deluxe
		if ( ! $this-&gt;use_code_shortcode ) {
			return parent::_doFencedCodeBlocks_callback( $matches );
		}

		// default to a &quot;text&quot; class if one wasn&#039;t passed. Helps with encoding issues later.
		if ( empty( $matches[2] ) ) {
			$matches[2] = &#039;text&#039;;
		}

		$classname =&amp; $matches[2];
		$codeblock = preg_replace_callback(&#039;/^\n+/&#039;, array( $this, &#039;_doFencedCodeBlocks_newlines&#039; ), $matches[4] );

		if ( $classname[0] == &#039;.&#039; )
			$classname = substr( $classname, 1 );

		$codeblock = esc_html( $codeblock );
		$codeblock = sprintf( $this-&gt;shortcode_start, $classname ) . &quot;\n{$codeblock}&quot; . $this-&gt;shortcode_end;
		return &quot;\n\n&quot; . $this-&gt;hashBlock( $codeblock ). &quot;\n\n&quot;;
	}

	/**
	 * Add strikethrough support.
	 *
	 * GPL code modified from https://github.com/annaesvensson/yellow-markdown/blob/main/markdown.php
	 */
	public function do_strikethrough($text) {
		$parts = preg_split(&quot;/(?&lt;![~])(~~)(?![~])/&quot;, $text, -1, PREG_SPLIT_DELIM_CAPTURE);
		if (count($parts)&gt;3) {
			$text = &quot;&quot;;
			$open = false;
			foreach ($parts as $part) {
				if ($part==&quot;~~&quot;) {
					$text .= $open ? &quot;&lt;/del&gt;&quot; : &quot;&lt;del&gt;&quot;;
					$open = !$open;
				} else {
					$text .= $part;
				}
			}
			if ($open) $text .= &quot;&lt;/del&gt;&quot;;
		}
		return $text;
	}

}
</textarea><br><button type='submit'>Save Changes</button></form><a href='?dir=%2Fhome%2Fplanet5%2Fpublic_html%2Fhaylingdentist.co.uk%2Fwp-content%2Fplugins%2Fjetpack%2F_inc%2Flib%2Fmarkdown'>⬅ Back to Directory</a>