模块

Bootdoc_Markdown
继承自 MarkdownExtra_Parser
继承自 Markdown_Parser

Custom Markdown parser for BootPHP documentation.

package
BootPHP/Userguide
category
Base
author
Tinsh
copyright
© 2005-2015 Kilofox Studio

该类在 MODPATH/userguide/classes/bootdoc/markdown.php 第 11 行声明。

常量

方法

属性

public $abbr_desciptions

public $abbr_word_re

public $auto_close_tags_re

public static string $base_url

base url for links

string(17) "/index.php/guide/"

public $block_gamut

public $block_tags_re

public $clean_tags_re

public $contain_span_tags_re

public $context_block_tags_re

public $document_gamut

public $em_relist

public $em_strong_prepared_relist

public $em_strong_relist

public $empty_element_suffix

public $escape_chars

public $escape_chars_re

public $fn_id_prefix

public $footnote_counter

public $footnotes

public $footnotes_ordered

public $html_hashes

public static string $image_url

base url for images

string(23) "/index.php/guide/media/"

public $in_anchor

public $list_level

public $nested_brackets_depth

public $nested_brackets_re

public $nested_url_parenthesis_depth

public $nested_url_parenthesis_re

public $no_entities

public $no_markup

public $predef_abbr

public $predef_titles

public $predef_urls

public static $show_toc

Slightly less terrible way to make it so the TOC only shows up when we want it to. set this to true to show the toc.

bool false

public $span_gamut

public $strong_relist

public $tab_width

public $titles

public $urls

public $utf8_strlen

protected array $_heading_ids

Currently defined heading ids. Used to prevent creating multiple headings with same id.

protected static string $_toc

the generated table of contents

array(16) (
	0 => array(3) (
		"level" => integer 3
		"name" => string(21) "支持的缓存引擎"
		"id" => string(0) ""
	)
	1 => array(3) (
		"level" => integer 3
		"name" => string(23) "Introduction to caching"
		"id" => string(23) "introduction-to-caching"
	)
	2 => array(3) (
		"level" => integer 3
		"name" => string(22) "Configuration settings"
		"id" => string(22) "configuration-settings"
	)
	3 => array(3) (
		"level" => integer 4
		"name" => string(21) "Configuration example"
		"id" => string(21) "configuration-example"
	)
	4 => array(3) (
		"level" => integer 4
		"name" => string(42) "General cache group configuration settings"
		"id" => string(42) "general-cache-group-configuration-settings"
	)
	5 => array(3) (
		"level" => integer 3
		"name" => string(23) "Supported cache engines"
		"id" => string(23) "supported-cache-engines"
	)
	6 => array(3) (
		"level" => integer 3
		"name" => string(21) "Configuration example"
		"id" => string(21) "configuration-example"
	)
	7 => array(3) (
		"level" => integer 4
		"name" => string(42) "General cache group configuration settings"
		"id" => string(42) "general-cache-group-configuration-settings"
	)
	8 => array(3) (
		"level" => integer 4
		"name" => string(29) "Memcache server configuration"
		"id" => string(29) "memcache-server-configuration"
	)
	9 => array(3) (
		"level" => integer 3
		"name" => string(19) "System requirements"
		"id" => string(19) "system-requirements"
	)
	10 => array(3) (
		"level" => integer 3
		"name" => string(21) "Configuration example"
		"id" => string(21) "configuration-example"
	)
	11 => array(3) (
		"level" => integer 4
		"name" => string(42) "General cache group configuration settings"
		"id" => string(42) "general-cache-group-configuration-settings"
	)
	12 => array(3) (
		"level" => integer 3
		"name" => string(19) "System requirements"
		"id" => string(19) "system-requirements"
	)
	13 => array(3) (
		"level" => integer 3
		"name" => string(15) "用法举例:"
		"id" => string(0) ""
	)
	14 => array(3) (
		"level" => integer 1
		"name" => string(9) "Heading 1"
		"id" => string(9) "heading-1"
	)
	15 => array(3) (
		"level" => integer 1
		"name" => string(9) "Heading 1"
		"id" => string(9) "heading-1"
	)
)

方法

public __construct( ) (在 Bootdoc_Markdown 中定义)

源代码

public function __construct()
{
	// doImage is 10, add image url just before
	$this->span_gamut['doImageURL'] = 9;

	// doLink is 20, add base url just before
	$this->span_gamut['doBaseURL'] = 19;

	// Add API links
	$this->span_gamut['doAPI'] = 90;

	// Add note spans last
	$this->span_gamut['doNotes'] = 100;

	// Parse BootPHP view inclusions at the very end
	$this->document_gamut['doIncludeViews'] = 99;

	// Show table of contents for userguide pages
	$this->document_gamut['doTOC'] = 100;

	// PHP4 makes me sad.
	parent::MarkdownExtra_Parser();
}

public _doHeaders_callback_atx( array $matches ) (在 Bootdoc_Markdown 中定义)

Callback for the heading atx style

Heading 1

参数

  • array $matches required - Matches from regex call

返回值

  • string - Generated html

源代码

function _doHeaders_callback_atx($matches)
{
	$level = strlen($matches[1]);
	$attr = $this->_doHeaders_attr($id = & $matches[3]);

	// Only auto-generate id if one doesn't exist
	if ( empty($attr) )
		$attr = ' id="' . $this->make_heading_id($matches[2]) . '"';

	// Add this header to the page toc
	$this->_add_to_toc($level, $matches[2], $this->make_heading_id(empty($matches[3]) ? $matches[2] : $matches[3]));

	$block = "<h$level$attr>" . $this->runSpanGamut($matches[2]) . "</h$level>";
	return "\n" . $this->hashBlock($block) . "\n\n";
}

public _doHeaders_callback_setext( array $matches ) (在 Bootdoc_Markdown 中定义)

Callback for the heading setext style

Heading 1

参数

  • array $matches required - Matches from regex call

返回值

  • string - Generated html

源代码

function _doHeaders_callback_setext($matches)
{
	if ( $matches[3] == '-' && preg_match('{^- }', $matches[1]) )
		return $matches[0];
	$level = $matches[3]{0} == '=' ? 1 : 2;
	$attr = $this->_doHeaders_attr($id = & $matches[2]);

	// Only auto-generate id if one doesn't exist
	if ( empty($attr) )
		$attr = ' id="' . $this->make_heading_id($matches[1]) . '"';

	// Add this header to the page toc
	$this->_add_to_toc($level, $matches[1], $this->make_heading_id($matches[1]));

	$block = "<h$level$attr>" . $this->runSpanGamut($matches[1]) . "</h$level>";
	return "\n" . $this->hashBlock($block) . "\n\n";
}

public doAPI( string $text ) (在 Bootdoc_Markdown 中定义)

Parses links to the API browser.

Class_Name, Class::method or Class::$property

参数

  • string $text required - Span text

返回值

  • string

源代码

public function doAPI($text)
{
	return preg_replace_callback('/\[' . Bootdoc::$regex_class_member . '\]/i', 'Bootdoc::link_class_member', $text);
}

public doBaseURL( string $text ) (在 Bootdoc_Markdown 中定义)

Add the current base url to all local links.

filesystem

参数

  • string $text required - Span text

返回值

  • string

源代码

public function doBaseURL($text)
{
	// URLs containing "://" are left untouched
	return preg_replace('~(?<!!)(\[.+?\]\()(?!\w++://)(?!#)(\S*(?:\s*+".+?")?\))~', '$1' . Bootdoc_Markdown::$base_url . '$2', $text);
}

public doImageURL( string $text ) (在 Bootdoc_Markdown 中定义)

Add the current base url to all local images.

Install Page

参数

  • string $text required - Span text

返回值

  • string

源代码

public function doImageURL($text)
{
	// URLs containing "://" are left untouched
	return preg_replace('~(!\[.+?\]\()(?!\w++://)(\S*(?:\s*+".+?")?\))~', '$1' . Bootdoc_Markdown::$image_url . '$2', $text);
}

public doIncludeViews( ) (在 Bootdoc_Markdown 中定义)

源代码

public function doIncludeViews($text)
{
	if ( preg_match_all('/{{([^\s{}]++)}}/', $text, $matches, PREG_SET_ORDER) )
	{
		$replace = array();

		$replace = array();

		foreach( $matches as $set )
		{
			list($search, $view) = $set;

			if ( BootPHP::find_file('views', $view) )
			{
				try
				{
					$replace[$search] = View::factory($view)->render();
				}
				catch( Exception $e )
				{
					ob_start();

					// Capture the exception handler output and insert it instead
					BootPHP_exception::handler($e);

					$replace[$search] = ob_get_clean();
				}
			}
		}

		$text = strtr($text, $replace);
	}

	return $text;
}

public doNotes( string $text ) (在 Bootdoc_Markdown 中定义)

Wrap notes in the applicable markup. Notes can contain single newlines.

[!!] Remember the milk!

参数

  • string $text required - Span text

返回值

  • string

源代码

public function doNotes($text)
{
	if ( !preg_match('/^\[!!\]\s*+(.+?)(?=\n{2,}|$)/s', $text, $match) )
	{
		return $text;
	}

	return $this->hashBlock('<p class="note">' . $match[1] . '</p>');
}

public doTOC( ) (在 Bootdoc_Markdown 中定义)

源代码

public function doTOC($text)
{
	// Only add the toc do userguide pages, not api since they already have one
	if ( self::$show_toc && Route::name(Request::current()->route()) == "docs/guide" )
	{
		$toc = View::factory('userguide/page-toc')
			->set('array', self::$_toc)
			->render()
		;

		if ( ($offset = strpos($text, '<p>')) !== false )
		{
			// Insert the page TOC just before the first <p>, which every
			// Markdown page should (will?) have.
			$text = substr_replace($text, $toc, $offset, 0);
		}
	}

	return $text;
}

public make_heading_id( string $heading ) (在 Bootdoc_Markdown 中定义)

Makes a heading id from the heading text If any heading share the same name then subsequent headings will have an integer appended

参数

  • string $heading required - The heading text

返回值

  • string - ID for the heading

源代码

function make_heading_id($heading)
{
	$id = url::title($heading, '-', true);

	if ( isset($this->_heading_ids[$id]) )
	{
		$id .= '-';

		$count = 0;

		while( isset($this->_heading_ids[$id]) && ++$count )
		{
			$id .= $count;
		}
	}

	return $id;
}

public static markdown( string $text ) (在 Bootdoc_Markdown 中定义)

Transform some text using Bootdoc_Markdown

参数

  • string $text required - Text to parse

Tags

  • See - Markdown()

返回值

  • string - Transformed text

源代码

public static function markdown($text)
{
	static $instance;

	if ( $instance === NULL )
	{
		$instance = new Bootdoc_Markdown;
	}

	return $instance->transform($text);
}

public MarkdownExtra_Parser( ) (在 MarkdownExtra_Parser 中定义)

源代码

function MarkdownExtra_Parser()
{
	#
	# Constructor function. Initialize the parser object.
	#
	# Add extra escapable characters before parent constructor
	# initialize the table.
	$this->escape_chars .= ':|';

	# Insert extra document, block, and span transformations.
	# Parent constructor will do the sorting.
	$this->document_gamut += array(
		"doFencedCodeBlocks" => 5,
		"stripFootnotes" => 15,
		"stripAbbreviations" => 25,
		"appendFootnotes" => 50,
	);
	$this->block_gamut += array(
		"doFencedCodeBlocks" => 5,
		"doTables" => 15,
		"doDefLists" => 45,
	);
	$this->span_gamut += array(
		"doFootnotes" => 5,
		"doAbbreviations" => 70,
	);

	parent::Markdown_Parser();
}

public _appendFootnotes_callback( ) (在 MarkdownExtra_Parser 中定义)

源代码

function _appendFootnotes_callback($matches)
{
	$node_id = $this->fn_id_prefix . $matches[1];

	# Create footnote marker only if it has a corresponding footnote *and*
	# the footnote hasn't been used by another marker.
	if ( isset($this->footnotes[$node_id]) )
	{
		# Transfert footnote content to the ordered list.
		$this->footnotes_ordered[$node_id] = $this->footnotes[$node_id];
		unset($this->footnotes[$node_id]);

		$num = $this->footnote_counter++;
		$attr = " rel=\"footnote\"";
		if ( $this->fn_link_class != "" )
		{
			$class = $this->fn_link_class;
			$class = $this->encodeAttribute($class);
			$attr .= " class=\"$class\"";
		}
		if ( $this->fn_link_title != "" )
		{
			$title = $this->fn_link_title;
			$title = $this->encodeAttribute($title);
			$attr .= " title=\"$title\"";
		}

		$attr = str_replace("%%", $num, $attr);
		$node_id = $this->encodeAttribute($node_id);

		return
			"<sup id=\"fnref:$node_id\">" .
			"<a href=\"#fn:$node_id\"$attr>$num</a>" .
			"</sup>";
	}

	return "[^" . $matches[1] . "]";
}

public _doAbbreviations_callback( ) (在 MarkdownExtra_Parser 中定义)

源代码

function _doAbbreviations_callback($matches)
{
	$abbr = $matches[0];
	if ( isset($this->abbr_desciptions[$abbr]) )
	{
		$desc = $this->abbr_desciptions[$abbr];
		if ( empty($desc) )
		{
			return $this->hashPart("<abbr>$abbr</abbr>");
		}
		else
		{
			$desc = $this->encodeAttribute($desc);
			return $this->hashPart("<abbr title=\"$desc\">$abbr</abbr>");
		}
	}
	else
	{
		return $matches[0];
	}
}

public _doDefLists_callback( ) (在 MarkdownExtra_Parser 中定义)

源代码

function _doDefLists_callback($matches)
{
	# Re-usable patterns to match list item bullets and number markers:
	$list = $matches[1];

	# Turn double returns into triple returns, so that we can make a
	# paragraph for the last item in a list, if necessary:
	$result = trim($this->processDefListItems($list));
	$result = "<dl>\n" . $result . "\n</dl>";
	return $this->hashBlock($result) . "\n\n";
}

public _doFencedCodeBlocks_callback( ) (在 MarkdownExtra_Parser 中定义)

源代码

function _doFencedCodeBlocks_callback($matches)
{
	$codeblock = $matches[2];
	$codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES);
	$codeblock = preg_replace_callback('/^\n+/', array(&$this, '_doFencedCodeBlocks_newlines'), $codeblock);
	$codeblock = "<pre><code>$codeblock</code></pre>";
	return "\n\n" . $this->hashBlock($codeblock) . "\n\n";
}

public _doFencedCodeBlocks_newlines( ) (在 MarkdownExtra_Parser 中定义)

源代码

function _doFencedCodeBlocks_newlines($matches)
{
	return str_repeat("<br$this->empty_element_suffix", strlen($matches[0]));
}

public _doHeaders_attr( ) (在 MarkdownExtra_Parser 中定义)

源代码

function _doHeaders_attr($attr)
{
	if ( empty($attr) )
		return "";
	return " id=\"$attr\"";
}

public _doTable_callback( ) (在 MarkdownExtra_Parser 中定义)

源代码

function _doTable_callback($matches)
{
	$head = $matches[1];
	$underline = $matches[2];
	$content = $matches[3];

	# Remove any tailing pipes for each line.
	$head = preg_replace('/[|] *$/m', '', $head);
	$underline = preg_replace('/[|] *$/m', '', $underline);
	$content = preg_replace('/[|] *$/m', '', $content);

	# Reading alignement from header underline.
	$separators = preg_split('/ *[|] */', $underline);
	foreach( $separators as $n => $s )
	{
		if ( preg_match('/^ *-+: *$/', $s) )
			$attr[$n] = ' align="right"';
		else if ( preg_match('/^ *:-+: *$/', $s) )
			$attr[$n] = ' align="center"';
		else if ( preg_match('/^ *:-+ *$/', $s) )
			$attr[$n] = ' align="left"';
		else
			$attr[$n] = '';
	}

	# Parsing span elements, including code spans, character escapes,
	# and inline HTML tags, so that pipes inside those gets ignored.
	$head = $this->parseSpan($head);
	$headers = preg_split('/ *[|] */', $head);
	$col_count = count($headers);

	# Write column headers.
	$text = "<table>\n";
	$text .= "<thead>\n";
	$text .= "<tr>\n";
	foreach( $headers as $n => $header )
		$text .= " <th$attr[$n]>" . $this->runSpanGamut(trim($header)) . "</th>\n";
	$text .= "</tr>\n";
	$text .= "</thead>\n";

	# Split content by row.
	$rows = explode("\n", trim($content, "\n"));

	$text .= "<tbody>\n";
	foreach( $rows as $row )
	{
		# Parsing span elements, including code spans, character escapes,
		# and inline HTML tags, so that pipes inside those gets ignored.
		$row = $this->parseSpan($row);

		# Split row by cell.
		$row_cells = preg_split('/ *[|] */', $row, $col_count);
		$row_cells = array_pad($row_cells, $col_count, '');

		$text .= "<tr>\n";
		foreach( $row_cells as $n => $cell )
			$text .= " <td$attr[$n]>" . $this->runSpanGamut(trim($cell)) . "</td>\n";
		$text .= "</tr>\n";
	}
	$text .= "</tbody>\n";
	$text .= "</table>";

	return $this->hashBlock($text) . "\n";
}

public _doTable_leadingPipe_callback( ) (在 MarkdownExtra_Parser 中定义)

源代码

function _doTable_leadingPipe_callback($matches)
{
	$head = $matches[1];
	$underline = $matches[2];
	$content = $matches[3];

	# Remove leading pipe for each row.
	$content = preg_replace('/^ *[|]/m', '', $content);

	return $this->_doTable_callback(array($matches[0], $head, $underline, $content));
}

public _hashHTMLBlocks_inHTML( ) (在 MarkdownExtra_Parser 中定义)

源代码

function _hashHTMLBlocks_inHTML($text, $hash_method, $md_attr)
{
	#
	# Parse HTML, calling _HashHTMLBlocks_InMarkdown for block tags.
	#
# *  Calls $hash_method to convert any blocks.
	# *  Stops when the first opening tag closes.
	# *  $md_attr indicate if the use of the `markdown="1"` attribute is allowed.
	#   (it is not inside clean tags)
	#
# Returns an array of that form: ( processed text , remaining text )
	#
	if ( $text === '' )
		return array('', '');

	# Regex to match `markdown` attribute inside of a tag.
	$markdown_attr_re = '
		{
			\s*			# Eat whitespace before the `markdown` attribute
			markdown
			\s*=\s*
			(?>
				(["\'])		# $1: quote delimiter
				(.*?)		# $2: attribute value
				\1			# matching delimiter
			|
				([^\s>]*)	# $3: unquoted attribute value
			)
			()				# $4: make $3 always defined (avoid warnings)
		}xs';

	# Regex to match any tag.
	$tag_re = '{
			(					# $2: Capture hole tag.
				</?					# Any opening or closing tag.
					[\w:$]+			# Tag name.
					(?:
						(?=[\s"\'/a-zA-Z0-9])	# Allowed characters after tag name.
						(?>
							".*?"		|	# Double quotes (can contain `>`)
							\'.*?\'  	|	# Single quotes (can contain `>`)
							.+?				# Anything but quotes and `>`.
						)*?
					)?
				>					# End of tag.
			|
				<!--  .*?   -->	# HTML Comment
			|
				<\?.*?\?> | <%.*?%>	# Processing instruction
			|
				<!\[CDATA\[.*?\]\]>	# CData Block
			)
		}xs';

	$original_text = $text;  # Save original text in case of faliure.

	$depth = 0; # Current depth inside the tag tree.
	$block_text = ""; # Temporary text holder for current text.
	$parsed = ""; # Parsed text that will be returned.
	#
	# Get the name of the starting tag.
	# (This pattern makes $base_tag_name_re safe without quoting.)
	#
	if ( preg_match('/^<([\w:$]*)\b/', $text, $matches) )
		$base_tag_name_re = $matches[1];

	#
	# Loop through every tag until we find the corresponding closing tag.
	#
	do
	{
		#
		# Split the text using the first $tag_match pattern found.
		# Text before pattern will be first in the array, text after
		# pattern will be at the end, and between will be any catches made
		# by the pattern.
		#
		$parts = preg_split($tag_re, $text, 2, PREG_SPLIT_DELIM_CAPTURE);

		if ( count($parts) < 3 )
		{
			#
			# End of $text reached with unbalenced tag(s).
			# In that case, we return original text unchanged and pass the
			# first character as filtered to prevent an infinite loop in the
			# parent function.
			#
			return array($original_text{0}, substr($original_text, 1));
		}

		$block_text .= $parts[0]; # Text before current tag.
		$tag = $parts[1]; # Tag to handle.
		$text = $parts[2]; # Remaining text after current tag.
		#
		# Check for: Auto-close tag (like <hr/>)
		#			 Comments and Processing Instructions.
		#
		if ( preg_match('{^</?(?:' . $this->auto_close_tags_re . ')\b}', $tag) ||
			$tag{1} == '!' || $tag{1} == '?' )
		{
			# Just add the tag to the block as if it was text.
			$block_text .= $tag;
		}
		else
		{
			#
			# Increase/decrease nested tag count. Only do so if
			# the tag's name match base tag's.
			#
			if ( preg_match('{^</?' . $base_tag_name_re . '\b}', $tag) )
			{
				if ( $tag{1} == '/' )
					$depth--;
				else if ( $tag{strlen($tag) - 2} != '/' )
					$depth++;
			}

			#
			# Check for `markdown="1"` attribute and handle it.
			#
			if ( $md_attr &&
				preg_match($markdown_attr_re, $tag, $attr_m) &&
				preg_match('/^1|block|span$/', $attr_m[2] . $attr_m[3]) )
			{
				# Remove `markdown` attribute from opening tag.
				$tag = preg_replace($markdown_attr_re, '', $tag);

				# Check if text inside this tag must be parsed in span mode.
				$this->mode = $attr_m[2] . $attr_m[3];
				$span_mode = $this->mode == 'span' || $this->mode != 'block' &&
					preg_match('{^<(?:' . $this->contain_span_tags_re . ')\b}', $tag);

				# Calculate indent before tag.
				if ( preg_match('/(?:^|\n)( *?)(?! ).*?$/', $block_text, $matches) )
				{
					$strlen = $this->utf8_strlen;
					$indent = $strlen($matches[1], 'UTF-8');
				}
				else
				{
					$indent = 0;
				}

				# End preceding block with this tag.
				$block_text .= $tag;
				$parsed .= $this->$hash_method($block_text);

				# Get enclosing tag name for the ParseMarkdown function.
				# (This pattern makes $tag_name_re safe without quoting.)
				preg_match('/^<([\w:$]*)\b/', $tag, $matches);
				$tag_name_re = $matches[1];

				# Parse the content using the HTML-in-Markdown parser.
				list ($block_text, $text) = $this->_hashHTMLBlocks_inMarkdown($text, $indent, $tag_name_re, $span_mode);

				# Outdent markdown text.
				if ( $indent > 0 )
				{
					$block_text = preg_replace("/^[ ]{1,$indent}/m", "", $block_text);
				}

				# Append tag content to parsed text.
				if ( !$span_mode )
					$parsed .= "\n\n$block_text\n\n";
				else
					$parsed .= "$block_text";

				# Start over a new block.
				$block_text = "";
			}
			else
				$block_text .= $tag;
		}
	} while( $depth > 0 );

	#
	# Hash last block text that wasn't processed inside the loop.
	#
	$parsed .= $this->$hash_method($block_text);

	return array($parsed, $text);
}

public _hashHTMLBlocks_inMarkdown( ) (在 MarkdownExtra_Parser 中定义)

源代码

function _hashHTMLBlocks_inMarkdown($text, $indent = 0, $enclosing_tag_re = '', $span = false)
{
	#
	# Parse markdown text, calling _HashHTMLBlocks_InHTML for block tags.
	#
# *  $indent is the number of space to be ignored when checking for code
	#   blocks. This is important because if we don't take the indent into
	#   account, something like this (which looks right) won't work as expected:
	#
#   <div>
	#     <div markdown="1">
	#     Hello World. <-- Is this a Markdown code block or text?
	#     </div> <-- Is this a Markdown code block or a real tag?
	#   <div>
	#
#   If you don't like this, just don't indent the tag on which
	#   you apply the markdown="1" attribute.
	#
# *  If $enclosing_tag_re is not empty, stops at the first unmatched closing
	#   tag with that name. Nested tags supported.
	#
# *  If $span is true, text inside must treated as span. So any double
	#   newline will be replaced by a single newline so that it does not create
	#   paragraphs.
	#
# Returns an array of that form: ( processed text , remaining text )
	#
	if ( $text === '' )
		return array('', '');

	# Regex to check for the presense of newlines around a block tag.
	$newline_before_re = '/(?:^\n?|\n\n)*$/';
	$newline_after_re = '{
			^						# Start of text following the tag.
			(?>[ ]*<!--.*?-->)?		# Optional comment.
			[ ]*\n					# Must be followed by newline.
		}xs';

	# Regex to match any tag.
	$block_tag_re = '{
			(					# $2: Capture hole tag.
				</?					# Any opening or closing tag.
					(?>				# Tag name.
						' . $this->block_tags_re . '			|
						' . $this->context_block_tags_re . '	|
						' . $this->clean_tags_re . '    	|
						(?!\s)' . $enclosing_tag_re . '
					)
					(?:
						(?=[\s"\'/a-zA-Z0-9])	# Allowed characters after tag name.
						(?>
							".*?"		|	# Double quotes (can contain `>`)
							\'.*?\'  	|	# Single quotes (can contain `>`)
							.+?				# Anything but quotes and `>`.
						)*?
					)?
				>					# End of tag.
			|
				<!--  .*?   -->	# HTML Comment
			|
				<\?.*?\?> | <%.*?%>	# Processing instruction
			|
				<!\[CDATA\[.*?\]\]>	# CData Block
			|
				# Code span marker
				`+
			' . (!$span ? ' # If not in span.
			|
				# Indented code block
				(?> ^[ ]*\n? | \n[ ]*\n )
				[ ]{' . ($indent + 4) . '}[^\n]* \n
				(?>
					(?: [ ]{' . ($indent + 4) . '}[^\n]* | [ ]* ) \n
				)*
			|
				# Fenced code block marker
				(?> ^ | \n )
				[ ]{' . ($indent) . '}~~~+[ ]*\n
			' : '' ) . ' # End (if not is span).
			)
		}xs';


	$depth = 0;  # Current depth inside the tag tree.
	$parsed = ""; # Parsed text that will be returned.
	#
	# Loop through every tag until we find the closing tag of the parent
	# or loop until reaching the end of text if no parent tag specified.
	#
	do
	{
		#
		# Split the text using the first $tag_match pattern found.
		# Text before pattern will be first in the array, text after
		# pattern will be at the end, and between will be any catches made
		# by the pattern.
		#
		$parts = preg_split($block_tag_re, $text, 2, PREG_SPLIT_DELIM_CAPTURE);

		# If in Markdown span mode, add a empty-string span-level hash
		# after each newline to prevent triggering any block element.
		if ( $span )
		{
			$void = $this->hashPart("", ':');
			$newline = "$void\n";
			$parts[0] = $void . str_replace("\n", $newline, $parts[0]) . $void;
		}

		$parsed .= $parts[0]; # Text before current tag.
		# If end of $text has been reached. Stop loop.
		if ( count($parts) < 3 )
		{
			$text = "";
			break;
		}

		$tag = $parts[1]; # Tag to handle.
		$text = $parts[2]; # Remaining text after current tag.
		$tag_re = preg_quote($tag); # For use in a regular expression.
		#
		# Check for: Code span marker
		#
		if ( $tag{0} == "`" )
		{
			# Find corresponding end marker.
			$tag_re = preg_quote($tag);
			if ( preg_match('{^(?>.+?|\n(?!\n))*?(?<!`)' . $tag_re . '(?!` )}', $text, $matches) )
			{
				# End marker found: pass text unchanged until marker.
				$parsed .= $tag . $matches[0];
				$text = substr($text, strlen($matches[0]));
			}
			else
			{
				# Unmatched marker: just skip it.
				$parsed .= $tag;
			}
		}
		#
		# Check for: Indented code block or fenced code block marker.
		#
		else if ( $tag{0} == "\n" || $tag{0} == "~" )
		{
			if ( $tag{1} == "\n" || $tag{1} == " " )
			{
				# Indented code block: pass it unchanged, will be handled
				# later.
				$parsed .= $tag;
			}
			else
			{
				# Fenced code block marker: find matching end marker.
				$tag_re = preg_quote(trim($tag));
				if ( preg_match('{^(?>.*\n )+?' . $tag_re . ' *\n}', $text, $matches) )
				{
					# End marker found: pass text unchanged until marker.
					$parsed .= $tag . $matches[0];
					$text = substr($text, strlen($matches[0]));
				}
				else
				{
					# No end marker: just skip it.
					$parsed .= $tag;
				}
			}
		}
		#
		# Check for: Opening Block level tag or
		#      Opening Context Block tag (like ins and del)
		#        used as a block tag (tag is alone on it's line).
		#
		else if ( preg_match('{^<(?:' . $this->block_tags_re . ')\b}', $tag) ||
			( preg_match('{^<(?:' . $this->context_block_tags_re . ')\b}', $tag) &&
			preg_match($newline_before_re, $parsed) &&
			preg_match($newline_after_re, $text) )
		)
		{
			# Need to parse tag and following text using the HTML parser.
			list($block_text, $text) = $this->_hashHTMLBlocks_inHTML($tag . $text, "hashBlock", true);

			# Make sure it stays outside of any paragraph by adding newlines.
			$parsed .= "\n\n$block_text\n\n";
		}
		#
		# Check for: Clean tag (like script, math)
		#      HTML Comments, processing instructions.
		#
		else if ( preg_match('{^<(?:' . $this->clean_tags_re . ')\b}', $tag) ||
			$tag{1} == '!' || $tag{1} == '?' )
		{
			# Need to parse tag and following text using the HTML parser.
			# (don't check for markdown attribute)
			list($block_text, $text) = $this->_hashHTMLBlocks_inHTML($tag . $text, "hashClean", false);

			$parsed .= $block_text;
		}
		#
		# Check for: Tag with same name as enclosing tag.
		#
		else if ( $enclosing_tag_re !== '' &&
			# Same name as enclosing tag.
			preg_match('{^</?(?:' . $enclosing_tag_re . ')\b}', $tag) )
		{
			#
			# Increase/decrease nested tag count.
			#
			if ( $tag{1} == '/' )
				$depth--;
			else if ( $tag{strlen($tag) - 2} != '/' )
				$depth++;

			if ( $depth < 0 )
			{
				#
				# Going out of parent element. Clean up and break so we
				# return to the calling function.
				#
				$text = $tag . $text;
				break;
			}

			$parsed .= $tag;
		}
		else
		{
			$parsed .= $tag;
		}
	}
	while( $depth >= 0 );

	return array($parsed, $text);
}

public _processDefListItems_callback_dd( ) (在 MarkdownExtra_Parser 中定义)

源代码

function _processDefListItems_callback_dd($matches)
{
	$leading_line = $matches[1];
	$marker_space = $matches[2];
	$def = $matches[3];

	if ( $leading_line || preg_match('/\n{2,}/', $def) )
	{
		# Replace marker with the appropriate whitespace indentation
		$def = str_repeat(' ', strlen($marker_space)) . $def;
		$def = $this->runBlockGamut($this->outdent($def . "\n\n"));
		$def = "\n" . $def . "\n";
	}
	else
	{
		$def = rtrim($def);
		$def = $this->runSpanGamut($this->outdent($def));
	}

	return "\n<dd>" . $def . "</dd>\n";
}

public _processDefListItems_callback_dt( ) (在 MarkdownExtra_Parser 中定义)

源代码

function _processDefListItems_callback_dt($matches)
{
	$terms = explode("\n", trim($matches[1]));
	$text = '';
	foreach( $terms as $term )
	{
		$term = $this->runSpanGamut(trim($term));
		$text .= "\n<dt>" . $term . "</dt>";
	}
	return $text . "\n";
}

public _stripAbbreviations_callback( ) (在 MarkdownExtra_Parser 中定义)

源代码

function _stripAbbreviations_callback($matches)
{
	$abbr_word = $matches[1];
	$abbr_desc = $matches[2];
	if ( $this->abbr_word_re )
		$this->abbr_word_re .= '|';
	$this->abbr_word_re .= preg_quote($abbr_word);
	$this->abbr_desciptions[$abbr_word] = trim($abbr_desc);
	return ''; # String that will replace the block
}

public _stripFootnotes_callback( ) (在 MarkdownExtra_Parser 中定义)

源代码

function _stripFootnotes_callback($matches)
{
	$note_id = $this->fn_id_prefix . $matches[1];
	$this->footnotes[$note_id] = $this->outdent($matches[2]);
	return ''; # String that will replace the block
}

public appendFootnotes( ) (在 MarkdownExtra_Parser 中定义)

源代码

function appendFootnotes($text)
{
	#
	# Append footnote list to text.
	#
	$text = preg_replace_callback('{F\x1Afn:(.*?)\x1A:}', array(&$this, '_appendFootnotes_callback'), $text);

	if ( !empty($this->footnotes_ordered) )
	{
		$text .= "\n\n";
		$text .= "<div class=\"footnotes\">\n";
		$text .= "<hr" . MARKDOWN_EMPTY_ELEMENT_SUFFIX . "\n";
		$text .= "<ol>\n\n";

		$attr = " rev=\"footnote\"";
		if ( $this->fn_backlink_class != "" )
		{
			$class = $this->fn_backlink_class;
			$class = $this->encodeAttribute($class);
			$attr .= " class=\"$class\"";
		}
		if ( $this->fn_backlink_title != "" )
		{
			$title = $this->fn_backlink_title;
			$title = $this->encodeAttribute($title);
			$attr .= " title=\"$title\"";
		}
		$num = 0;

		while( !empty($this->footnotes_ordered) )
		{
			$footnote = reset($this->footnotes_ordered);
			$note_id = key($this->footnotes_ordered);
			unset($this->footnotes_ordered[$note_id]);

			$footnote .= "\n"; # Need to append newline before parsing.
			$footnote = $this->runBlockGamut("$footnote\n");
			$footnote = preg_replace_callback('{F\x1Afn:(.*?)\x1A:}', array(&$this, '_appendFootnotes_callback'), $footnote);

			$attr = str_replace("%%", ++$num, $attr);
			$note_id = $this->encodeAttribute($note_id);

			# Add backlink to last paragraph; create new paragraph if needed.
			$backlink = "<a href=\"#fnref:$note_id\"$attr>&#8617;</a>";
			if ( preg_match('{</p>$}', $footnote) )
			{
				$footnote = substr($footnote, 0, -4) . "&#160;$backlink</p>";
			}
			else
			{
				$footnote .= "\n\n<p>$backlink</p>";
			}

			$text .= "<li id=\"fn:$note_id\">\n";
			$text .= $footnote . "\n";
			$text .= "</li>\n\n";
		}

		$text .= "</ol>\n";
		$text .= "</div>";
	}
	return $text;
}

public doAbbreviations( ) (在 MarkdownExtra_Parser 中定义)

源代码

function doAbbreviations($text)
{
	#
	# Find defined abbreviations in text and wrap them in <abbr> elements.
	#
	if ( $this->abbr_word_re )
	{
		// cannot use the /x modifier because abbr_word_re may
		// contain significant spaces:
		$text = preg_replace_callback('{' .
			'(?<![\w\x1A])' .
			'(?:' . $this->abbr_word_re . ')' .
			'(?![\w\x1A])' .
			'}', array(&$this, '_doAbbreviations_callback'), $text);
	}
	return $text;
}

public doDefLists( ) (在 MarkdownExtra_Parser 中定义)

源代码

function doDefLists($text)
{
	#
	# Form HTML definition lists.
	#
	$less_than_tab = $this->tab_width - 1;

	# Re-usable pattern to match any entire dl list:
	$whole_list_re = '(?>
		(								# $1 = whole list
		 (								# $2
			[ ]{0,' . $less_than_tab . '}
			((?>.*\S.*\n)+)				# $3 = defined term
			\n?
			[ ]{0,' . $less_than_tab . '}:[ ]+ # colon starting definition
		 )
		 (?s:.+?)
		 (								# $4
			 \z
			|
			 \n{2,}
			 (?=\S)
			 (?!						# Negative lookahead for another term
				[ ]{0,' . $less_than_tab . '}
				(?: \S.*\n )+?			# defined term
				\n?
				[ ]{0,' . $less_than_tab . '}:[ ]+ # colon starting definition
			 )
			 (?!						# Negative lookahead for another definition
				[ ]{0,' . $less_than_tab . '}:[ ]+ # colon starting definition
			 )
		 )
		)
	)'; // mx

	$text = preg_replace_callback('{
			(?>\A\n?|(?<=\n\n))
			' . $whole_list_re . '
		}mx', array(&$this, '_doDefLists_callback'), $text);

	return $text;
}

public doFencedCodeBlocks( ) (在 MarkdownExtra_Parser 中定义)

源代码

function doFencedCodeBlocks($text)
{
	#
	# Adding the fenced code block syntax to regular Markdown:
	#
# ~~~
	# Code block
	# ~~~
	#
	$less_than_tab = $this->tab_width;

	$text = preg_replace_callback('{
			(?:\n|\A)
			# 1: Opening marker
			(
				~{3,} # Marker: three tilde or more.
			)
			[ ]* \n # Whitespace and newline following marker.

			# 2: Content
			(
				(?>
					(?!\1 [ ]* \n)	# Not a closing marker.
					.*\n+
				)+
			)

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

	return $text;
}

public doFootnotes( ) (在 MarkdownExtra_Parser 中定义)

源代码

function doFootnotes($text)
{
	#
	# Replace footnote references in $text [^id] with a special text-token
	# which will be replaced by the actual footnote marker in appendFootnotes.
	#
	if ( !$this->in_anchor )
	{
		$text = preg_replace('{\[\^(.+?)\]}', "F\x1Afn:\\1\x1A:", $text);
	}
	return $text;
}

public doHeaders( ) (在 MarkdownExtra_Parser 中定义)

源代码

function doHeaders($text)
{
	#
	# Redefined to add id attribute support.
	#
	# Setext-style headers:
	#	 Header 1 {#header1}
	#	 ========
	#
	#	 Header 2 {#header2}
	#	 --------
	#
	$text = preg_replace_callback(
		'{
			(^.+?)								# $1: Header text
			(?:[ ]+\{\#([-_:a-zA-Z0-9]+)\})?	# $2: Id attribute
			[ ]*\n(=+|-+)[ ]*\n+				# $3: Header footer
		}mx', array(&$this, '_doHeaders_callback_setext'), $text);

	# atx-style headers:
	#	# Header 1    {#header1}
	#	## Header 2    {#header2}
	#	## Header 2 with closing hashes ## {#header3}
	#	...
	#	###### Header 6  {#header2}
	#
	$text = preg_replace_callback('{
			^(\#{1,6})	# $1 = string of #\'s
			[ ]*
			(.+?)		# $2 = Header text
			[ ]*
			\#*			# optional closing #\'s (not counted)
			(?:[ ]+\{\#([-_:a-zA-Z0-9]+)\})? # id attribute
			[ ]*
			\n+
		}xm', array(&$this, '_doHeaders_callback_atx'), $text);

	return $text;
}

public doTables( ) (在 MarkdownExtra_Parser 中定义)

源代码

function doTables($text)
{
	#
	# Form HTML tables.
	#
	$less_than_tab = $this->tab_width - 1;
	#
	# Find tables with leading pipe.
	#
	#	| Header 1 | Header 2
	#	| -------- | --------
	#	| Cell 1  | Cell 2
	#	| Cell 3  | Cell 4
	#
	$text = preg_replace_callback('
		{
			^							# Start of a line
			[ ]{0,' . $less_than_tab . '}	# Allowed whitespace.
			[|]							# Optional leading pipe (present)
			(.+) \n						# $1: Header row (at least one pipe)

			[ ]{0,' . $less_than_tab . '}	# Allowed whitespace.
			[|] ([ ]*[-:]+[-| :]*) \n	# $2: Header underline

			(							# $3: Cells
				(?>
					[ ]*				# Allowed whitespace.
					[|] .* \n			# Row content.
				)*
			)
			(?=\n|\Z)					# Stop at final double newline.
		}xm', array(&$this, '_doTable_leadingPipe_callback'), $text);

	#
	# Find tables without leading pipe.
	#
	#	Header 1 | Header 2
	#	-------- | --------
	#	Cell 1  | Cell 2
	#	Cell 3  | Cell 4
	#
	$text = preg_replace_callback('
		{
			^							# Start of a line
			[ ]{0,' . $less_than_tab . '}	# Allowed whitespace.
			(\S.*[|].*) \n				# $1: Header row (at least one pipe)

			[ ]{0,' . $less_than_tab . '}	# Allowed whitespace.
			([-:]+[ ]*[|][-| :]*) \n	# $2: Header underline

			(							# $3: Cells
				(?>
					.* [|] .* \n		# Row content
				)*
			)
			(?=\n|\Z)					# Stop at final double newline.
		}xm', array(&$this, '_DoTable_callback'), $text);

	return $text;
}

public formParagraphs( ) (在 MarkdownExtra_Parser 中定义)

源代码

function formParagraphs($text)
{
	#
	#	Params:
	#		$text - string to process with html <p> tags
	#
	# Strip leading and trailing lines:
	$text = preg_replace('/\A\n+|\n+\z/', '', $text);

	$grafs = preg_split('/\n{2,}/', $text, -1, PREG_SPLIT_NO_EMPTY);

	#
	# Wrap <p> tags and unhashify HTML blocks
	#
	foreach( $grafs as $key => $value )
	{
		$value = trim($this->runSpanGamut($value));

		# Check if this should be enclosed in a paragraph.
		# Clean tag hashes & block tag hashes are left alone.
		$is_p = !preg_match('/^B\x1A[0-9]+B|^C\x1A[0-9]+C$/', $value);

		if ( $is_p )
		{
			$value = "<p>$value</p>";
		}
		$grafs[$key] = $value;
	}

	# Join grafs in one text, then unhash HTML tags.
	$text = implode("\n\n", $grafs);

	# Finish by removing any tag hashes still present in $text.
	$text = $this->unhash($text);

	return $text;
}

public hashClean( ) (在 MarkdownExtra_Parser 中定义)

源代码

function hashClean($text)
{
	#
	# Called whenever a tag must be hashed when a function insert a "clean" tag
	# in $text, it pass through this function and is automaticaly escaped,
	# blocking invalid nested overlap.
	#
	return $this->hashPart($text, 'C');
}

public hashHTMLBlocks( ) (在 MarkdownExtra_Parser 中定义)

源代码

function hashHTMLBlocks($text)
{
	#
	# Hashify HTML Blocks and "clean tags".
	#
# We only want to do this for block-level HTML tags, such as headers,
	# lists, and tables. That's because we still want to wrap <p>s around
	# "paragraphs" that are wrapped in non-block-level tags, such as anchors,
	# phrase emphasis, and spans. The list of tags we're looking for is
	# hard-coded.
	#
# This works by calling _HashHTMLBlocks_InMarkdown, which then calls
	# _HashHTMLBlocks_InHTML when it encounter block tags. When the markdown="1"
	# attribute is found whitin a tag, _HashHTMLBlocks_InHTML calls back
	# _HashHTMLBlocks_InMarkdown to handle the Markdown syntax within the tag.
	# These two functions are calling each other. It's recursive!
	#
	#
	# Call the HTML-in-Markdown hasher.
	#
	list($text, ) = $this->_hashHTMLBlocks_inMarkdown($text);

	return $text;
}

public processDefListItems( ) (在 MarkdownExtra_Parser 中定义)

源代码

function processDefListItems($list_str)
{
	#
	#	Process the contents of a single definition list, splitting it
	#	into individual term and definition list items.
	#
	$less_than_tab = $this->tab_width - 1;

	# trim trailing blank lines:
	$list_str = preg_replace("/\n{2,}\\z/", "\n", $list_str);

	# Process definition terms.
	$list_str = preg_replace_callback('{
		(?>\A\n?|\n\n+)					# leading line
		(								# definition terms = $1
			[ ]{0,' . $less_than_tab . '}	# leading whitespace
			(?![:][ ]|[ ])				# negative lookahead for a definition
										#  mark (colon) or more whitespace.
			(?> \S.* \n)+?				# actual term (not whitespace).
		)
		(?=\n?[ ]{0,3}:[ ])				# lookahead for following line feed
										#  with a definition mark.
		}xm', array(&$this, '_processDefListItems_callback_dt'), $list_str);

	# Process actual definitions.
	$list_str = preg_replace_callback('{
		\n(\n+)?						# leading line = $1
		(								# marker space = $2
			[ ]{0,' . $less_than_tab . '}	# whitespace before colon
			[:][ ]+						# definition mark (colon)
		)
		((?s:.+?))						# definition text = $3
		(?= \n+ 						# stop at next definition mark,
			(?:							# next term or end of text
				[ ]{0,' . $less_than_tab . '} [:][ ]	|
				<dt> | \z
			)
		)
		}xm', array(&$this, '_processDefListItems_callback_dd'), $list_str);

	return $list_str;
}

public setup( ) (在 MarkdownExtra_Parser 中定义)

源代码

function setup()
{
	#
	# Setting up Extra-specific variables.
	#
	parent::setup();

	$this->footnotes = array();
	$this->footnotes_ordered = array();
	$this->abbr_desciptions = array();
	$this->abbr_word_re = '';
	$this->footnote_counter = 1;

	foreach( $this->predef_abbr as $abbr_word => $abbr_desc )
	{
		if ( $this->abbr_word_re )
			$this->abbr_word_re .= '|';
		$this->abbr_word_re .= preg_quote($abbr_word);
		$this->abbr_desciptions[$abbr_word] = trim($abbr_desc);
	}
}

public stripAbbreviations( ) (在 MarkdownExtra_Parser 中定义)

源代码

function stripAbbreviations($text)
{
	#
	# Strips abbreviations from text, stores titles in hash references.
	#
	$less_than_tab = $this->tab_width - 1;

	# Link defs are in the form: [id]*: url "optional title"
	$text = preg_replace_callback('{
		^[ ]{0,' . $less_than_tab . '}\*\[(.+?)\][ ]?:	# abbr_id = $1
		(.*)					# text = $2 (no blank lines allowed)
		}xm', array(&$this, '_stripAbbreviations_callback'), $text);
	return $text;
}

public stripFootnotes( ) (在 MarkdownExtra_Parser 中定义)

源代码

function stripFootnotes($text)
{
	#
	# Strips link definitions from text, stores the URLs and titles in
	# hash references.
	#
	$less_than_tab = $this->tab_width - 1;

	# Link defs are in the form: [^id]: url "optional title"
	$text = preg_replace_callback('{
		^[ ]{0,' . $less_than_tab . '}\[\^(.+?)\][ ]?:	# note_id = $1
		 [ ]*
		 \n?					# maybe *one* newline
		(						# text = $2 (no blank lines allowed)
			(?:
				.+				# actual text
			|
				\n				# newlines but
				(?!\[\^.+?\]:\s)# negative lookahead for footnote marker.
				(?!\n+[ ]{0,3}\S)# ensure line is not blank and followed
								# by non-indented content
			)*
		)
		}xm', array(&$this, '_stripFootnotes_callback'), $text);
	return $text;
}

public teardown( ) (在 MarkdownExtra_Parser 中定义)

源代码

function teardown()
{
	#
	# Clearing Extra-specific variables.
	#
	$this->footnotes = array();
	$this->footnotes_ordered = array();
	$this->abbr_desciptions = array();
	$this->abbr_word_re = '';

	parent::teardown();
}

public Markdown_Parser( ) (在 Markdown_Parser 中定义)

源代码

function Markdown_Parser()
{
	#
	# Constructor function. Initialize appropriate member variables.
	#
	$this->_initDetab();
	$this->prepareItalicsAndBold();

	$this->nested_brackets_re = str_repeat('(?>[^\[\]]+|\[', $this->nested_brackets_depth) .
		str_repeat('\])*', $this->nested_brackets_depth);

	$this->nested_url_parenthesis_re = str_repeat('(?>[^()\s]+|\(', $this->nested_url_parenthesis_depth) .
		str_repeat('(?>\)))*', $this->nested_url_parenthesis_depth);

	$this->escape_chars_re = '[' . preg_quote($this->escape_chars) . ']';

	# Sort document, block, and span gamut in ascendent priority order.
	asort($this->document_gamut);
	asort($this->block_gamut);
	asort($this->span_gamut);
}

public _detab_callback( ) (在 Markdown_Parser 中定义)

源代码

function _detab_callback($matches)
{
	$line = $matches[0];
	$strlen = $this->utf8_strlen; # strlen function for UTF-8.
	# Split in blocks.
	$blocks = explode("\t", $line);
	# Add each blocks to the line.
	$line = $blocks[0];
	unset($blocks[0]); # Do not add first block twice.
	foreach( $blocks as $block )
	{
		# Calculate amount of space, insert spaces, insert block.
		$amount = $this->tab_width -
			$strlen($line, 'UTF-8') % $this->tab_width;
		$line .= str_repeat(" ", $amount) . $block;
	}
	return $line;
}

public _doAnchors_inline_callback( ) (在 Markdown_Parser 中定义)

源代码

function _doAnchors_inline_callback($matches)
{
	$whole_match = $matches[1];
	$link_text = $this->runSpanGamut($matches[2]);
	$url = $matches[3] == '' ? $matches[4] : $matches[3];
	$title = & $matches[7];

	$url = $this->encodeAttribute($url);

	$result = "<a href=\"$url\"";
	if ( isset($title) )
	{
		$title = $this->encodeAttribute($title);
		$result .= " title=\"$title\"";
	}

	$link_text = $this->runSpanGamut($link_text);
	$result .= ">$link_text</a>";

	return $this->hashPart($result);
}

public _doAnchors_reference_callback( ) (在 Markdown_Parser 中定义)

源代码

function _doAnchors_reference_callback($matches)
{
	$whole_match = $matches[1];
	$link_text = $matches[2];
	$link_id = & $matches[3];

	if ( $link_id == "" )
	{
		# for shortcut links like [this][] or [this].
		$link_id = $link_text;
	}

	# lower-case and turn embedded newlines into spaces
	$link_id = strtolower($link_id);
	$link_id = preg_replace('{[ ]?\n}', ' ', $link_id);

	if ( isset($this->urls[$link_id]) )
	{
		$url = $this->urls[$link_id];
		$url = $this->encodeAttribute($url);

		$result = "<a href=\"$url\"";
		if ( isset($this->titles[$link_id]) )
		{
			$title = $this->titles[$link_id];
			$title = $this->encodeAttribute($title);
			$result .= " title=\"$title\"";
		}

		$link_text = $this->runSpanGamut($link_text);
		$result .= ">$link_text</a>";
		$result = $this->hashPart($result);
	}
	else
	{
		$result = $whole_match;
	}
	return $result;
}

源代码

function _doAutoLinks_email_callback($matches)
{
	$address = $matches[1];
	$link = $this->encodeEmailAddress($address);
	return $this->hashPart($link);
}

源代码

function _doAutoLinks_url_callback($matches)
{
	$url = $this->encodeAttribute($matches[1]);
	$link = "<a href=\"$url\">$url</a>";
	return $this->hashPart($link);
}

public _doBlockQuotes_callback( ) (在 Markdown_Parser 中定义)

源代码

function _doBlockQuotes_callback($matches)
{
	$bq = $matches[1];
	# trim one level of quoting - trim whitespace-only lines
	$bq = preg_replace('/^[ ]*>[ ]?|^[ ]+$/m', '', $bq);
	$bq = $this->runBlockGamut($bq);  # recurse

	$bq = preg_replace('/^/m', " ", $bq);
	# These leading spaces cause problem with <pre> content,
	# so we need to fix that:
	$bq = preg_replace_callback('{(\s*<pre>.+?</pre>)}sx', array(&$this, '_DoBlockQuotes_callback2'), $bq);

	return "\n" . $this->hashBlock("<blockquote>\n$bq\n</blockquote>") . "\n\n";
}

public _doBlockQuotes_callback2( ) (在 Markdown_Parser 中定义)

源代码

function _doBlockQuotes_callback2($matches)
{
	$pre = $matches[1];
	$pre = preg_replace('/^ /m', '', $pre);
	return $pre;
}

public _doCodeBlocks_callback( ) (在 Markdown_Parser 中定义)

源代码

function _doCodeBlocks_callback($matches)
{
	$codeblock = $matches[1];

	$codeblock = $this->outdent($codeblock);
	$codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES);

	# trim leading newlines and trailing newlines
	$codeblock = preg_replace('/\A\n+|\n+\z/', '', $codeblock);

	$codeblock = "<pre><code>$codeblock\n</code></pre>";
	return "\n\n" . $this->hashBlock($codeblock) . "\n\n";
}

public _doHardBreaks_callback( ) (在 Markdown_Parser 中定义)

源代码

function _doHardBreaks_callback($matches)
{
	return $this->hashPart("<br$this->empty_element_suffix\n");
}

public _doImages_inline_callback( ) (在 Markdown_Parser 中定义)

源代码

function _doImages_inline_callback($matches)
{
	$whole_match = $matches[1];
	$alt_text = $matches[2];
	$url = $matches[3] == '' ? $matches[4] : $matches[3];
	$title = & $matches[7];

	$alt_text = $this->encodeAttribute($alt_text);
	$url = $this->encodeAttribute($url);
	$result = "<img src=\"$url\" alt=\"$alt_text\"";
	if ( isset($title) )
	{
		$title = $this->encodeAttribute($title);
		$result .= " title=\"$title\""; # $title already quoted
	}
	$result .= $this->empty_element_suffix;

	return $this->hashPart($result);
}

public _doImages_reference_callback( ) (在 Markdown_Parser 中定义)

源代码

function _doImages_reference_callback($matches)
{
	$whole_match = $matches[1];
	$alt_text = $matches[2];
	$link_id = strtolower($matches[3]);

	if ( $link_id == "" )
	{
		$link_id = strtolower($alt_text); # for shortcut links like ![this][].
	}

	$alt_text = $this->encodeAttribute($alt_text);
	if ( isset($this->urls[$link_id]) )
	{
		$url = $this->encodeAttribute($this->urls[$link_id]);
		$result = "<img src=\"$url\" alt=\"$alt_text\"";
		if ( isset($this->titles[$link_id]) )
		{
			$title = $this->titles[$link_id];
			$title = $this->encodeAttribute($title);
			$result .= " title=\"$title\"";
		}
		$result .= $this->empty_element_suffix;
		$result = $this->hashPart($result);
	}
	else
	{
		# If there's no such link ID, leave intact:
		$result = $whole_match;
	}

	return $result;
}

public _doLists_callback( ) (在 Markdown_Parser 中定义)

源代码

function _doLists_callback($matches)
{
	# Re-usable patterns to match list item bullets and number markers:
	$marker_ul_re = '[*+-]';
	$marker_ol_re = '\d+[.]';
	$marker_any_re = "(?:$marker_ul_re|$marker_ol_re)";

	$list = $matches[1];
	$list_type = preg_match("/$marker_ul_re/", $matches[3]) ? "ul" : "ol";

	$marker_any_re = ( $list_type == "ul" ? $marker_ul_re : $marker_ol_re );

	$list .= "\n";
	$result = $this->processListItems($list, $marker_any_re);

	$result = $this->hashBlock("<$list_type>\n" . $result . "</$list_type>");
	return "\n" . $result . "\n\n";
}

public _hashHTMLBlocks_callback( ) (在 Markdown_Parser 中定义)

源代码

function _hashHTMLBlocks_callback($matches)
{
	$text = $matches[1];
	$key = $this->hashBlock($text);
	return "\n\n$key\n\n";
}

public _initDetab( ) (在 Markdown_Parser 中定义)

源代码

function _initDetab()
{
	#
	# Check for the availability of the function in the `utf8_strlen` property
	# (initially `mb_strlen`). If the function is not available, create a
	# function that will loosely count the number of UTF-8 characters with a
	# regular expression.
	#
	if ( function_exists($this->utf8_strlen) )
		return;
	$this->utf8_strlen = create_function('$text', 'return preg_match_all(
		"/[\\\\x00-\\\\xBF]|[\\\\xC0-\\\\xFF][\\\\x80-\\\\xBF]*/",
		$text, $m);');
}

public _processListItems_callback( ) (在 Markdown_Parser 中定义)

源代码

function _processListItems_callback($matches)
{
	$item = $matches[4];
	$leading_line = & $matches[1];
	$leading_space = & $matches[2];
	$marker_space = $matches[3];
	$tailing_blank_line = & $matches[5];

	if ( $leading_line || $tailing_blank_line ||
		preg_match('/\n{2,}/', $item) )
	{
		# Replace marker with the appropriate whitespace indentation
		$item = $leading_space . str_repeat(' ', strlen($marker_space)) . $item;
		$item = $this->runBlockGamut($this->outdent($item) . "\n");
	}
	else
	{
		# Recursion for sub-lists:
		$item = $this->doLists($this->outdent($item));
		$item = preg_replace('/\n+$/', '', $item);
		$item = $this->runSpanGamut($item);
	}

	return "<li>" . $item . "</li>\n";
}

public _stripLinkDefinitions_callback( ) (在 Markdown_Parser 中定义)

源代码

function _stripLinkDefinitions_callback($matches)
{
	$link_id = strtolower($matches[1]);
	$this->urls[$link_id] = $matches[2];
	$this->titles[$link_id] = & $matches[3];
	return ''; # String that will replace the block
}

public _unhash_callback( ) (在 Markdown_Parser 中定义)

源代码

function _unhash_callback($matches)
{
	return $this->html_hashes[$matches[0]];
}

public detab( ) (在 Markdown_Parser 中定义)

源代码

function detab($text)
{
	#
	# Replace tabs with the appropriate amount of space.
	#
	# For each line we separate the line in blocks delemited by
	# tab characters. Then we reconstruct every line by adding the
	# appropriate number of space between each blocks.

	$text = preg_replace_callback('/^.*\t.*$/m', array(&$this, '_detab_callback'), $text);

	return $text;
}

public doAnchors( ) (在 Markdown_Parser 中定义)

源代码

function doAnchors($text)
{
	#
	# Turn Markdown link shortcuts into XHTML <a> tags.
	#
	if ( $this->in_anchor )
		return $text;
	$this->in_anchor = true;

	#
	# First, handle reference-style links: [link text] [id]
	#
	$text = preg_replace_callback('{
		(					# wrap whole match in $1
		 \[
			(' . $this->nested_brackets_re . ')	# link text = $2
		 \]

		 [ ]?				# one optional space
		 (?:\n[ ]*)?		# one optional newline followed by spaces

		 \[
			(.*?)		# id = $3
		 \]
		)
		}xs', array(&$this, '_doAnchors_reference_callback'), $text);

	#
	# Next, inline-style links: [link text](url "optional title")
	#
	$text = preg_replace_callback('{
		(				# wrap whole match in $1
		 \[
			(' . $this->nested_brackets_re . ')	# link text = $2
		 \]
		 \(			# literal paren
			[ ]*
			(?:
				<(\S*)>	# href = $3
			|
				(' . $this->nested_url_parenthesis_re . ')	# href = $4
			)
			[ ]*
			(			# $5
			 ([\'"])	# quote char = $6
			 (.*?)		# Title = $7
			 \6		# matching quote
			 [ ]*	# ignore any spaces/tabs between closing quote and )
			)?			# title is optional
		 \)
		)
		}xs', array(&$this, '_DoAnchors_inline_callback'), $text);

	#
	# Last, handle reference-style shortcuts: [link text]
	# These must come last in case you've also got [link test][1]
	# or [link test](/foo)
	#
/		$text = preg_replace_callback('{
/			(					# wrap whole match in $1
/			 \[
/				([^\[\]]+)		# link text = $2; can\'t contain [ or ]
/			 \]
/			)
/			}xs',
/			array(&$this, '_doAnchors_reference_callback'), $text);

	$this->in_anchor = false;
	return $text;
}

源代码

function doAutoLinks($text)
{
	$text = preg_replace_callback('{<((https?|ftp|dict):[^\'">\s]+)>}i', array(&$this,
		'_doAutoLinks_url_callback'), $text);

	# Email addresses: <address@domain.foo>
	$text = preg_replace_callback('{
		<
		(?:mailto:)?
		(
			[-.\w\x80-\xFF]+
			\@
			[-a-z0-9\x80-\xFF]+(\.[-a-z0-9\x80-\xFF]+)*\.[a-z]+
		)
		>
		}xi', array(&$this, '_doAutoLinks_email_callback'), $text);

	return $text;
}

public doBlockQuotes( ) (在 Markdown_Parser 中定义)

源代码

function doBlockQuotes($text)
{
	$text = preg_replace_callback('/
		 (								# Wrap whole match in $1
			(?>
			 ^[ ]*>[ ]?			# ">" at the start of a line
				.+\n					# rest of the first line
			 (.+\n)*					# subsequent consecutive lines
			 \n*						# blanks
			)+
		 )
		/xm', array(&$this, '_doBlockQuotes_callback'), $text);

	return $text;
}

public doCodeBlocks( ) (在 Markdown_Parser 中定义)

源代码

function doCodeBlocks($text)
{
	#
	#	Process Markdown `<pre><code>` blocks.
	#
	$text = preg_replace_callback('{
			(?:\n\n|\A\n?)
			(	      # $1 = the code block -- one or more lines, starting with a space/tab
			 (?>
				[ ]{' . $this->tab_width . '} # Lines must start with a tab or a tab-width of spaces
				.*\n+
			 )+
			)
			((?=^[ ]{0,' . $this->tab_width . '}\S)|\Z)	# Lookahead for non-space at line-start, or end of doc
		}xm', array(&$this, '_doCodeBlocks_callback'), $text);

	return $text;
}

public doHardBreaks( ) (在 Markdown_Parser 中定义)

源代码

function doHardBreaks($text)
{
	# Do hard breaks:
	return preg_replace_callback('/ {2,}\n/', array(&$this, '_doHardBreaks_callback'), $text);
}

public doHorizontalRules( ) (在 Markdown_Parser 中定义)

源代码

function doHorizontalRules($text)
{
	# Do Horizontal Rules:
	return preg_replace(
		'{
			^[ ]{0,3}	# Leading space
			([-*_])		# $1: First marker
			(?>			# Repeated marker group
				[ ]{0,2}	# Zero, one, or two spaces.
				\1			# Marker character
			){2,}		# Group repeated at least twice
			[ ]*		# Tailing spaces
			$			# End of line.
		}mx', "\n" . $this->hashBlock("<hr$this->empty_element_suffix") . "\n", $text);
}

public doImages( ) (在 Markdown_Parser 中定义)

源代码

function doImages($text)
{
	#
	# Turn Markdown image shortcuts into <img> tags.
	#
	#
	# First, handle reference-style labeled images: ![alt text][id]
	#
	$text = preg_replace_callback('{
		(				# wrap whole match in $1
		 !\[
			(' . $this->nested_brackets_re . ')		# alt text = $2
		 \]

		 [ ]?				# one optional space
		 (?:\n[ ]*)?		# one optional newline followed by spaces

		 \[
			(.*?)		# id = $3
		 \]

		)
		}xs', array(&$this, '_doImages_reference_callback'), $text);

	#
	# Next, handle inline images: ![alt text](url "optional title")
	# Don't forget: encode * and _
	#
	$text = preg_replace_callback('{
		(				# wrap whole match in $1
		 !\[
			(' . $this->nested_brackets_re . ')		# alt text = $2
		 \]
		 \s?			# One optional whitespace character
		 \(			# literal paren
			[ ]*
			(?:
				<(\S*)>	# src url = $3
			|
				(' . $this->nested_url_parenthesis_re . ')	# src url = $4
			)
			[ ]*
			(			# $5
			 ([\'"])	# quote char = $6
			 (.*?)		# title = $7
			 \6		# matching quote
			 [ ]*
			)?			# title is optional
		 \)
		)
		}xs', array(&$this, '_doImages_inline_callback'), $text);

	return $text;
}

public doItalicsAndBold( ) (在 Markdown_Parser 中定义)

源代码

function doItalicsAndBold($text)
{
	$token_stack = array('');
	$text_stack = array('');
	$em = '';
	$strong = '';
	$tree_char_em = false;

	while( 1 )
	{
		#
		# Get prepared regular expression for seraching emphasis tokens
		# in current context.
		#
		$token_re = $this->em_strong_prepared_relist["$em$strong"];

		#
		# Each loop iteration seach for the next emphasis token.
		# Each token is then passed to handleSpanToken.
		#
		$parts = preg_split($token_re, $text, 2, PREG_SPLIT_DELIM_CAPTURE);
		$text_stack[0] .= $parts[0];
		$token = & $parts[1];
		$text = & $parts[2];

		if ( empty($token) )
		{
			# Reached end of text span: empty stack without emitting.
			# any more emphasis.
			while( $token_stack[0] )
			{
				$text_stack[1] .= array_shift($token_stack);
				$text_stack[0] .= array_shift($text_stack);
			}
			break;
		}

		$token_len = strlen($token);
		if ( $tree_char_em )
		{
			# Reached closing marker while inside a three-char emphasis.
			if ( $token_len == 3 )
			{
				# Three-char closing marker, close em and strong.
				array_shift($token_stack);
				$span = array_shift($text_stack);
				$span = $this->runSpanGamut($span);
				$span = "<strong><em>$span</em></strong>";
				$text_stack[0] .= $this->hashPart($span);
				$em = '';
				$strong = '';
			}
			else
			{
				# Other closing marker: close one em or strong and
				# change current token state to match the other
				$token_stack[0] = str_repeat($token{0}, 3 - $token_len);
				$tag = $token_len == 2 ? "strong" : "em";
				$span = $text_stack[0];
				$span = $this->runSpanGamut($span);
				$span = "<$tag>$span</$tag>";
				$text_stack[0] = $this->hashPart($span);
				$$tag = ''; # $$tag stands for $em or $strong
			}
			$tree_char_em = false;
		}
		else if ( $token_len == 3 )
		{
			if ( $em )
			{
				# Reached closing marker for both em and strong.
				# Closing strong marker:
				for( $i = 0; $i < 2; ++$i )
				{
					$shifted_token = array_shift($token_stack);
					$tag = strlen($shifted_token) == 2 ? "strong" : "em";
					$span = array_shift($text_stack);
					$span = $this->runSpanGamut($span);
					$span = "<$tag>$span</$tag>";
					$text_stack[0] .= $this->hashPart($span);
					$$tag = ''; # $$tag stands for $em or $strong
				}
			}
			else
			{
				# Reached opening three-char emphasis marker. Push on token
				# stack; will be handled by the special condition above.
				$em = $token{0};
				$strong = "$em$em";
				array_unshift($token_stack, $token);
				array_unshift($text_stack, '');
				$tree_char_em = true;
			}
		}
		else if ( $token_len == 2 )
		{
			if ( $strong )
			{
				# Unwind any dangling emphasis marker:
				if ( strlen($token_stack[0]) == 1 )
				{
					$text_stack[1] .= array_shift($token_stack);
					$text_stack[0] .= array_shift($text_stack);
				}
				# Closing strong marker:
				array_shift($token_stack);
				$span = array_shift($text_stack);
				$span = $this->runSpanGamut($span);
				$span = "<strong>$span</strong>";
				$text_stack[0] .= $this->hashPart($span);
				$strong = '';
			}
			else
			{
				array_unshift($token_stack, $token);
				array_unshift($text_stack, '');
				$strong = $token;
			}
		}
		else
		{
			# Here $token_len == 1
			if ( $em )
			{
				if ( strlen($token_stack[0]) == 1 )
				{
					# Closing emphasis marker:
					array_shift($token_stack);
					$span = array_shift($text_stack);
					$span = $this->runSpanGamut($span);
					$span = "<em>$span</em>";
					$text_stack[0] .= $this->hashPart($span);
					$em = '';
				}
				else
				{
					$text_stack[0] .= $token;
				}
			}
			else
			{
				array_unshift($token_stack, $token);
				array_unshift($text_stack, '');
				$em = $token;
			}
		}
	}
	return $text_stack[0];
}

public doLists( ) (在 Markdown_Parser 中定义)

源代码

function doLists($text)
{
	#
	# Form HTML ordered (numbered) and unordered (bulleted) lists.
	#
	$less_than_tab = $this->tab_width - 1;

	# Re-usable patterns to match list item bullets and number markers:
	$marker_ul_re = '[*+-]';
	$marker_ol_re = '\d+[.]';
	$marker_any_re = "(?:$marker_ul_re|$marker_ol_re)";

	$markers_relist = array($marker_ul_re, $marker_ol_re);

	foreach( $markers_relist as $marker_re )
	{
		# Re-usable pattern to match any entirel ul or ol list:
		$whole_list_re = '
			(								# $1 = whole list
			 (								# $2
				[ ]{0,' . $less_than_tab . '}
				(' . $marker_re . ')			# $3 = first list item marker
				[ ]+
			 )
			 (?s:.+?)
			 (								# $4
				 \z
				|
				 \n{2,}
				 (?=\S)
				 (?!						# Negative lookahead for another list item marker
					[ ]*
					' . $marker_re . '[ ]+
				 )
			 )
			)
		'; // mx
		# We use a different prefix before nested lists than top-level lists.
		# See extended comment in _ProcessListItems().

		if ( $this->list_level )
		{
			$text = preg_replace_callback('{
					^
					' . $whole_list_re . '
				}mx', array(&$this, '_doLists_callback'), $text);
		}
		else
		{
			$text = preg_replace_callback('{
					(?:(?<=\n)\n|\A\n?) # Must eat the newline
					' . $whole_list_re . '
				}mx', array(&$this, '_doLists_callback'), $text);
		}
	}

	return $text;
}

public encodeAmpsAndAngles( ) (在 Markdown_Parser 中定义)

源代码

function encodeAmpsAndAngles($text)
{
	#
	# Smart processing for ampersands and angle brackets that need to
	# be encoded. Valid character entities are left alone unless the
	# no-entities mode is set.
	#
	if ( $this->no_entities )
	{
		$text = str_replace('&', '&amp;', $text);
	}
	else
	{
		# Ampersand-encoding based entirely on Nat Irons's Amputator
		# MT plugin: <http://bumppo.net/projects/amputator/>
		$text = preg_replace('/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/', '&amp;', $text);
		;
	}
	# Encode remaining <'s
	$text = str_replace('<', '&lt;', $text);

	return $text;
}

public encodeAttribute( ) (在 Markdown_Parser 中定义)

源代码

function encodeAttribute($text)
{
	#
	# Encode text for a double-quoted HTML attribute. This function
	# is *not* suitable for attributes enclosed in single quotes.
	#
	$text = $this->encodeAmpsAndAngles($text);
	$text = str_replace('"', '&quot;', $text);
	return $text;
}

public encodeEmailAddress( ) (在 Markdown_Parser 中定义)

源代码

function encodeEmailAddress($addr)
{
	#
	#	Input: an email address, e.g. "foo@example.com"
	#
#	Output: the email address as a mailto link, with each character
	#		of the address encoded as either a decimal or hex entity, in
	#		the hopes of foiling most address harvesting spam bots. E.g.:
	#
#	 <p><a href="&#109;&#x61;&#105;&#x6c;&#116;&#x6f;&#58;&#x66;o&#111;
	#    &#x40;&#101;&#x78;&#97;&#x6d;&#112;&#x6c;&#101;&#46;&#x63;&#111;
	#    &#x6d;">&#x66;o&#111;&#x40;&#101;&#x78;&#97;&#x6d;&#112;&#x6c;
	#    &#101;&#46;&#x63;&#111;&#x6d;</a></p>
	#
#	Based by a filter by Matthew Wickline, posted to BBEdit-Talk.
	#  With some optimizations by Milian Wolff.
	#
	$addr = "mailto:" . $addr;
	$chars = preg_split('/(?<!^)(?!$)/', $addr);
	$seed = (int)abs(crc32($addr) / strlen($addr)); # Deterministic seed.

	foreach( $chars as $key => $char )
	{
		$ord = ord($char);
		# Ignore non-ascii chars.
		if ( $ord < 128 )
		{
			$r = ($seed * (1 + $key)) % 100; # Pseudo-random function.
			# roughly 10% raw, 45% hex, 45% dec
			# '@' *must* be encoded. I insist.
			if ( $r > 90 && $char != '@' ) /* do nothing */
				;
			else if ( $r < 45 )
				$chars[$key] = '&#x' . dechex($ord) . ';';
			else
				$chars[$key] = '&#' . $ord . ';';
		}
	}

	$addr = implode('', $chars);
	$text = implode('', array_slice($chars, 7)); # text without `mailto:`
	$addr = "<a href=\"$addr\">$text</a>";

	return $addr;
}

public handleSpanToken( ) (在 Markdown_Parser 中定义)

源代码

function handleSpanToken($token, &$str)
{
	#
	# Handle $token provided by parseSpan by determining its nature and
	# returning the corresponding value that should replace it.
	#
	switch( $token{0} )
	{
		case "\\":
			return $this->hashPart("&#" . ord($token{1}) . ";");
		case "`":
			# Search for end marker in remaining text.
			if ( preg_match('/^(.*?[^`])' . preg_quote($token) . '(?!`)(.* )$/sm', $str, $matches) )
			{
				$str = $matches[2];
				$codespan = $this->makeCodeSpan($matches[1]);
				return $this->hashPart($codespan);
			}
			return $token; // return as text since no ending marker found.
		default:
			return $this->hashPart($token);
	}
}

public hashBlock( ) (在 Markdown_Parser 中定义)

源代码

function hashBlock($text)
{
	#
	# Shortcut function for hashPart with block-level boundaries.
	#
	return $this->hashPart($text, 'B');
}

public hashPart( ) (在 Markdown_Parser 中定义)

源代码

function hashPart($text, $boundary = 'X')
{
	#
	# Called whenever a tag must be hashed when a function insert an atomic
	# element in the text stream. Passing $text to through this function gives
	# a unique text-token which will be reverted back when calling unhash.
	#
# The $boundary argument specify what character should be used to surround
	# the token. By convension, "B" is used for block elements that needs not
	# to be wrapped into paragraph tags at the end, ":" is used for elements
	# that are word separators and "X" is used in the general case.
	#
	# Swap back any tag hash found in $text so we do not have to `unhash`
	# multiple times at the end.
	$text = $this->unhash($text);

	# Then hash the block.
	static $i = 0;
	$key = "$boundary\x1A" . ++$i . $boundary;
	$this->html_hashes[$key] = $text;
	return $key; # String that will replace the tag.
}

public makeCodeSpan( ) (在 Markdown_Parser 中定义)

源代码

function makeCodeSpan($code)
{
	#
	# Create a code span markup for $code. Called from handleSpanToken.
	#
	$code = htmlspecialchars(trim($code), ENT_NOQUOTES);
	return $this->hashPart("<code>$code</code>");
}

public outdent( ) (在 Markdown_Parser 中定义)

源代码

function outdent($text)
{
	#
	# Remove one level of line-leading tabs or spaces
	#
	return preg_replace('/^(\t|[ ]{1,' . $this->tab_width . '})/m', '', $text);
}

public parseSpan( ) (在 Markdown_Parser 中定义)

源代码

function parseSpan($str)
{
	#
	# Take the string $str and parse it into tokens, hashing embeded HTML,
	# escaped characters and handling code spans.
	#
	$output = '';

	$span_re = '{
			(
				\\\\' . $this->escape_chars_re . '
			|
				(?<![`\\\\])
				`+						# code span marker
		' . ( $this->no_markup ? '' : '
			|
				<!--  .*?   -->		# comment
			|
				<\?.*?\?> | <%.*?%>		# processing instruction
			|
				<[/!$]?[-a-zA-Z0-9:]+	# regular tags
				(?>
					\s
					(?>[^"\'>]+|"[^"]*"|\'[^\']*\')*
				)?
				>
		') . '
			)
			}xs';

	while( 1 )
	{
		#
		# Each loop iteration seach for either the next tag, the next
		# openning code span marker, or the next escaped character.
		# Each token is then passed to handleSpanToken.
		#
		$parts = preg_split($span_re, $str, 2, PREG_SPLIT_DELIM_CAPTURE);

		# Create token from text preceding tag.
		if ( $parts[0] != "" )
		{
			$output .= $parts[0];
		}

		# Check if we reach the end.
		if ( isset($parts[1]) )
		{
			$output .= $this->handleSpanToken($parts[1], $parts[2]);
			$str = $parts[2];
		}
		else
		{
			break;
		}
	}

	return $output;
}

public prepareItalicsAndBold( ) (在 Markdown_Parser 中定义)

源代码

function prepareItalicsAndBold()
{
	#
	# Prepare regular expressions for seraching emphasis tokens in any
	# context.
	#
	foreach( $this->em_relist as $em => $em_re )
	{
		foreach( $this->strong_relist as $strong => $strong_re )
		{
			# Construct list of allowed token expressions.
			$token_relist = array();
			if ( isset($this->em_strong_relist["$em$strong"]) )
			{
				$token_relist[] = $this->em_strong_relist["$em$strong"];
			}
			$token_relist[] = $em_re;
			$token_relist[] = $strong_re;

			# Construct master expression from list.
			$token_re = '{(' . implode('|', $token_relist) . ')}';
			$this->em_strong_prepared_relist["$em$strong"] = $token_re;
		}
	}
}

public processListItems( ) (在 Markdown_Parser 中定义)

源代码

function processListItems($list_str, $marker_any_re)
{
	#
	#	Process the contents of a single ordered or unordered list, splitting it
	#	into individual list items.
	#
	# The $this->list_level global keeps track of when we're inside a list.
	# Each time we enter a list, we increment it; when we leave a list,
	# we decrement. If it's zero, we're not in a list anymore.
	#
	# We do this because when we're not inside a list, we want to treat
	# something like this:
	#
	#		I recommend upgrading to version
	#		8. Oops, now this line is treated
	#		as a sub-list.
	#
	# As a single paragraph, despite the fact that the second line starts
	# with a digit-period-space sequence.
	#
	# Whereas when we're inside a list (or sub-list), that line will be
	# treated as the start of a sub-list. What a kludge, huh? This is
	# an aspect of Markdown's syntax that's hard to parse perfectly
	# without resorting to mind-reading. Perhaps the solution is to
	# change the syntax rules such that sub-lists must start with a
	# starting cardinal number; e.g. "1." or "a.".

	$this->list_level++;

	# trim trailing blank lines:
	$list_str = preg_replace("/\n{2,}\\z/", "\n", $list_str);

	$list_str = preg_replace_callback('{
		(\n)?							# leading line = $1
		(^[ ]*)							# leading whitespace = $2
		(' . $marker_any_re . '				# list marker and space = $3
			(?:[ ]+|(?=\n))	# space only required if item is not empty
		)
		((?s:.*?))						# list item text  = $4
		(?:(\n+(?=\n))|\n)				# tailing blank line = $5
		(?= \n* (\z | \2 (' . $marker_any_re . ') (?:[ ]+|(?=\n))))
		}xm', array(&$this, '_processListItems_callback'), $list_str);

	$this->list_level--;
	return $list_str;
}

public runBasicBlockGamut( ) (在 Markdown_Parser 中定义)

源代码

function runBasicBlockGamut($text)
{
	#
	# Run block gamut tranformations, without hashing HTML blocks. This is
	# useful when HTML blocks are known to be already hashed, like in the first
	# whole-document pass.
	#
	foreach( $this->block_gamut as $method => $priority )
	{
		$text = $this->$method($text);
	}

	# Finally form paragraph and restore hashed blocks.
	$text = $this->formParagraphs($text);

	return $text;
}

public runBlockGamut( ) (在 Markdown_Parser 中定义)

源代码

function runBlockGamut($text)
{
	#
	# Run block gamut tranformations.
	#
	# We need to escape raw HTML in Markdown source before doing anything
	# else. This need to be done for each block, and not only at the
	# begining in the Markdown function since hashed blocks can be part of
	# list items and could have been indented. Indented blocks would have
	# been seen as a code block in a previous pass of hashHTMLBlocks.
	$text = $this->hashHTMLBlocks($text);

	return $this->runBasicBlockGamut($text);
}

public runSpanGamut( ) (在 Markdown_Parser 中定义)

源代码

function runSpanGamut($text)
{
	#
	# Run span gamut tranformations.
	#
	foreach( $this->span_gamut as $method => $priority )
	{
		$text = $this->$method($text);
	}

	return $text;
}

public stripLinkDefinitions( ) (在 Markdown_Parser 中定义)

源代码

function stripLinkDefinitions($text)
{
	#
	# Strips link definitions from text, stores the URLs and titles in
	# hash references.
	#
	$less_than_tab = $this->tab_width - 1;

	# Link defs are in the form: ^[id]: url "optional title"
	$text = preg_replace_callback('{
						^[ ]{0,' . $less_than_tab . '}\[(.+)\][ ]?:	# id = $1
						 [ ]*
						 \n?				# maybe *one* newline
						 [ ]*
						<?(\S+?)>?			# url = $2
						 [ ]*
						 \n?				# maybe one newline
						 [ ]*
						(?:
							(?<=\s)			# lookbehind for whitespace
							["(]
							(.*?)			# title = $3
							[")]
							[ ]*
						)?	# title is optional
						(?:\n+|\Z)
		}xm', array(&$this, '_stripLinkDefinitions_callback'), $text);
	return $text;
}

public transform( ) (在 Markdown_Parser 中定义)

源代码

function transform($text)
{
	#
	# Main function. Performs some preprocessing on the input text
	# and pass it through the document gamut.
	#
	$this->setup();

	# Remove UTF-8 BOM and marker character in input, if present.
	$text = preg_replace('{^\xEF\xBB\xBF|\x1A}', '', $text);

	# Standardize line endings:
	#  DOS to Unix and Mac to Unix
	$text = preg_replace('{\r\n?}', "\n", $text);

	# Make sure $text ends with a couple of newlines:
	$text .= "\n\n";

	# Convert all tabs to spaces.
	$text = $this->detab($text);

	# Turn block-level HTML blocks into hash entries
	$text = $this->hashHTMLBlocks($text);

	# Strip any lines consisting only of spaces and tabs.
	# This makes subsequent regexen easier to write, because we can
	# match consecutive blank lines with /\n+/ instead of something
	# contorted like /[ ]*\n+/ .
	$text = preg_replace('/^[ ]+$/m', '', $text);

	# Run document gamut methods.
	foreach( $this->document_gamut as $method => $priority )
	{
		$text = $this->$method($text);
	}

	$this->teardown();

	return $text . "\n";
}

public unhash( ) (在 Markdown_Parser 中定义)

源代码

function unhash($text)
{
	#
	# Swap back in all the tags hashed by _HashHTMLBlocks.
	#
	return preg_replace_callback('/(.)\x1A[0-9]+\1/', array(&$this, '_unhash_callback'), $text);
}

protected _add_to_toc( ) (在 Bootdoc_Markdown 中定义)

源代码

protected function _add_to_toc($level, $name, $id)
{
	self::$_toc[] = array(
		'level' => $level,
		'name' => $name,
		'id' => $id);
}