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2648 lines
72 KiB
PHP
2648 lines
72 KiB
PHP
<?php
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#
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# Markdown Extra - A text-to-HTML conversion tool for web writers
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#
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# PHP Markdown & Extra
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# Copyright (c) 2004-2012 Michel Fortin
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# <http://michelf.com/projects/php-markdown/>
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#
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# Original Markdown
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# Copyright (c) 2004-2006 John Gruber
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# <http://daringfireball.net/projects/markdown/>
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#
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#
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# Markdown Parser Class
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#
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class Markdown_Parser {
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# Regex to match balanced [brackets].
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# Needed to insert a maximum bracked depth while converting to PHP.
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public $nested_brackets_depth = 6;
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public $nested_brackets_re;
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public $nested_url_parenthesis_depth = 4;
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public $nested_url_parenthesis_re;
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# Table of hash values for escaped characters:
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public $escape_chars = '\`*_{}[]()>#+-.!';
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public $escape_chars_re;
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# Change to ">" for HTML output.
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public $empty_element_suffix = ' />';
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public $tab_width = 4;
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# Change to `true` to disallow markup or entities.
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public $no_markup = false;
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public $no_entities = false;
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# Predefined urls and titles for reference links and images.
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public $predef_urls = array();
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public $predef_titles = array();
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public function __construct() {
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#
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# Constructor function. Initialize appropriate member variables.
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#
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$this->_initDetab();
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$this->prepareItalicsAndBold();
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$this->nested_brackets_re =
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str_repeat('(?>[^\[\]]+|\[', $this->nested_brackets_depth).
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str_repeat('\])*', $this->nested_brackets_depth);
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$this->nested_url_parenthesis_re =
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str_repeat('(?>[^()\s]+|\(', $this->nested_url_parenthesis_depth).
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str_repeat('(?>\)))*', $this->nested_url_parenthesis_depth);
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$this->escape_chars_re = '['.preg_quote($this->escape_chars).']';
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# Sort document, block, and span gamut in ascendent priority order.
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asort($this->document_gamut);
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asort($this->block_gamut);
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asort($this->span_gamut);
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}
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# Internal hashes used during transformation.
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public $urls = array();
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public $titles = array();
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public $html_hashes = array();
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# Status flag to avoid invalid nesting.
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public $in_anchor = false;
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public function setup() {
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#
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# Called before the transformation process starts to setup parser
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# states.
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#
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# Clear global hashes.
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$this->urls = $this->predef_urls;
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$this->titles = $this->predef_titles;
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$this->html_hashes = array();
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$in_anchor = false;
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}
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public function teardown() {
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#
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# Called after the transformation process to clear any variable
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# which may be taking up memory unnecessarly.
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#
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$this->urls = array();
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$this->titles = array();
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$this->html_hashes = array();
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}
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public function transform($text) {
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#
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# Main function. Performs some preprocessing on the input text
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# and pass it through the document gamut.
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#
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$this->setup();
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# Remove UTF-8 BOM and marker character in input, if present.
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$text = preg_replace('{^\xEF\xBB\xBF|\x1A}', '', $text);
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# Standardize line endings:
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# DOS to Unix and Mac to Unix
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$text = preg_replace('{\r\n?}', "\n", $text);
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# Make sure $text ends with a couple of newlines:
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$text .= "\n\n";
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# Convert all tabs to spaces.
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$text = $this->detab($text);
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# Turn block-level HTML blocks into hash entries
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$text = $this->hashHTMLBlocks($text);
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# Strip any lines consisting only of spaces and tabs.
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# This makes subsequent regexen easier to write, because we can
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# match consecutive blank lines with /\n+/ instead of something
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# contorted like /[ ]*\n+/ .
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$text = preg_replace('/^[ ]+$/m', '', $text);
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# Run document gamut methods.
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foreach ($this->document_gamut as $method => $priority) {
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$text = $this->$method($text);
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}
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$this->teardown();
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return $text . "\n";
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}
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public $document_gamut = array(
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# Strip link definitions, store in hashes.
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"stripLinkDefinitions" => 20,
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"runBasicBlockGamut" => 30,
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);
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public function stripLinkDefinitions($text) {
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#
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# Strips link definitions from text, stores the URLs and titles in
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# hash references.
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#
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$less_than_tab = $this->tab_width - 1;
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# Link defs are in the form: ^[id]: url "optional title"
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$text = preg_replace_callback('{
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^[ ]{0,'.$less_than_tab.'}\[(.+)\][ ]?: # id = $1
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[ ]*
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\n? # maybe *one* newline
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[ ]*
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(?:
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<(.+?)> # url = $2
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(\S+?) # url = $3
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)
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[ ]*
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\n? # maybe one newline
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[ ]*
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(?:
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(?<=\s) # lookbehind for whitespace
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["(]
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(.*?) # title = $4
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[")]
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[ ]*
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)? # title is optional
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(?:\n+|\Z)
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}xm',
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array(&$this, '_stripLinkDefinitions_callback'),
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$text);
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return $text;
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}
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public function _stripLinkDefinitions_callback($matches) {
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$link_id = strtolower($matches[1]);
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$url = $matches[2] == '' ? $matches[3] : $matches[2];
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$this->urls[$link_id] = $url;
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$this->titles[$link_id] =& $matches[4];
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return ''; # String that will replace the block
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}
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public function hashHTMLBlocks($text) {
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if ($this->no_markup) return $text;
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$less_than_tab = $this->tab_width - 1;
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# Hashify HTML blocks:
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# We only want to do this for block-level HTML tags, such as headers,
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# lists, and tables. That's because we still want to wrap <p>s around
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# "paragraphs" that are wrapped in non-block-level tags, such as anchors,
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# phrase emphasis, and spans. The list of tags we're looking for is
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# hard-coded:
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#
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# * List "a" is made of tags which can be both inline or block-level.
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# These will be treated block-level when the start tag is alone on
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# its line, otherwise they're not matched here and will be taken as
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# inline later.
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# * List "b" is made of tags which are always block-level;
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#
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$block_tags_a_re = 'ins|del';
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$block_tags_b_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|'.
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'script|noscript|form|fieldset|iframe|math';
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# Regular expression for the content of a block tag.
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$nested_tags_level = 4;
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$attr = '
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(?> # optional tag attributes
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\s # starts with whitespace
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(?>
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[^>"/]+ # text outside quotes
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/+(?!>) # slash not followed by ">"
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"[^"]*" # text inside double quotes (tolerate ">")
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\'[^\']*\' # text inside single quotes (tolerate ">")
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)*
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)?
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';
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$content =
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str_repeat('
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(?>
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[^<]+ # content without tag
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<\2 # nested opening tag
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'.$attr.' # attributes
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(?>
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/>
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>', $nested_tags_level). # end of opening tag
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'.*?'. # last level nested tag content
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str_repeat('
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</\2\s*> # closing nested tag
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)
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<(?!/\2\s*> # other tags with a different name
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)
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)*',
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$nested_tags_level);
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$content2 = str_replace('\2', '\3', $content);
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# First, look for nested blocks, e.g.:
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# <div>
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# <div>
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# tags for inner block must be indented.
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# </div>
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# </div>
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#
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# The outermost tags must start at the left margin for this to match, and
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# the inner nested divs must be indented.
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# We need to do this before the next, more liberal match, because the next
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# match will start at the first `<div>` and stop at the first `</div>`.
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$text = preg_replace_callback('{(?>
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(?>
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(?<=\n\n) # Starting after a blank line
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| # or
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\A\n? # the beginning of the doc
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)
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( # save in $1
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# Match from `\n<tag>` to `</tag>\n`, handling nested tags
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# in between.
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[ ]{0,'.$less_than_tab.'}
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<('.$block_tags_b_re.')# start tag = $2
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'.$attr.'> # attributes followed by > and \n
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'.$content.' # content, support nesting
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</\2> # the matching end tag
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[ ]* # trailing spaces/tabs
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(?=\n+|\Z) # followed by a newline or end of document
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| # Special version for tags of group a.
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[ ]{0,'.$less_than_tab.'}
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<('.$block_tags_a_re.')# start tag = $3
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'.$attr.'>[ ]*\n # attributes followed by >
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'.$content2.' # content, support nesting
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</\3> # the matching end tag
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[ ]* # trailing spaces/tabs
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(?=\n+|\Z) # followed by a newline or end of document
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| # Special case just for <hr />. It was easier to make a special
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# case than to make the other regex more complicated.
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[ ]{0,'.$less_than_tab.'}
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<(hr) # start tag = $2
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'.$attr.' # attributes
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/?> # the matching end tag
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[ ]*
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(?=\n{2,}|\Z) # followed by a blank line or end of document
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| # Special case for standalone HTML comments:
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[ ]{0,'.$less_than_tab.'}
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(?s:
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<!-- .*? -->
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)
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[ ]*
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(?=\n{2,}|\Z) # followed by a blank line or end of document
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| # PHP and ASP-style processor instructions (<? and <%)
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[ ]{0,'.$less_than_tab.'}
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(?s:
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<([?%]) # $2
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.*?
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\2>
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)
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[ ]*
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(?=\n{2,}|\Z) # followed by a blank line or end of document
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)
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)}Sxmi',
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array(&$this, '_hashHTMLBlocks_callback'),
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$text);
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return $text;
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}
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public function _hashHTMLBlocks_callback($matches) {
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$text = $matches[1];
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$key = $this->hashBlock($text);
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return "\n\n$key\n\n";
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}
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public function hashPart($text, $boundary = 'X') {
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#
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# Called whenever a tag must be hashed when a function insert an atomic
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# element in the text stream. Passing $text to through this function gives
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# a unique text-token which will be reverted back when calling unhash.
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#
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# The $boundary argument specify what character should be used to surround
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# the token. By convension, "B" is used for block elements that needs not
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# to be wrapped into paragraph tags at the end, ":" is used for elements
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# that are word separators and "X" is used in the general case.
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#
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# Swap back any tag hash found in $text so we do not have to `unhash`
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# multiple times at the end.
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$text = $this->unhash($text);
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# Then hash the block.
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static $i = 0;
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$key = "$boundary\x1A" . ++$i . $boundary;
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$this->html_hashes[$key] = $text;
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return $key; # String that will replace the tag.
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}
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public function hashBlock($text) {
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#
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# Shortcut function for hashPart with block-level boundaries.
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#
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return $this->hashPart($text, 'B');
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}
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public $block_gamut = array(
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#
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# These are all the transformations that form block-level
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# tags like paragraphs, headers, and list items.
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#
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"doHeaders" => 10,
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"doHorizontalRules" => 20,
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"doLists" => 40,
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"doCodeBlocks" => 50,
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"doBlockQuotes" => 60,
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);
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public function runBlockGamut($text) {
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#
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# Run block gamut tranformations.
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#
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# We need to escape raw HTML in Markdown source before doing anything
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# else. This need to be done for each block, and not only at the
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# begining in the Markdown function since hashed blocks can be part of
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# list items and could have been indented. Indented blocks would have
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# been seen as a code block in a previous pass of hashHTMLBlocks.
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$text = $this->hashHTMLBlocks($text);
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return $this->runBasicBlockGamut($text);
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}
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public function runBasicBlockGamut($text) {
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#
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# Run block gamut tranformations, without hashing HTML blocks. This is
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# useful when HTML blocks are known to be already hashed, like in the first
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# whole-document pass.
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#
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foreach ($this->block_gamut as $method => $priority) {
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$text = $this->$method($text);
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}
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# Finally form paragraph and restore hashed blocks.
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$text = $this->formParagraphs($text);
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return $text;
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}
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public function doHorizontalRules($text) {
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# Do Horizontal Rules:
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return preg_replace(
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'{
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^[ ]{0,3} # Leading space
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([-*_]) # $1: First marker
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(?> # Repeated marker group
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[ ]{0,2} # Zero, one, or two spaces.
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\1 # Marker character
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){2,} # Group repeated at least twice
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[ ]* # Tailing spaces
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$ # End of line.
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}mx',
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"\n".$this->hashBlock("<hr$this->empty_element_suffix")."\n",
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$text);
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}
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public $span_gamut = array(
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#
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# These are all the transformations that occur *within* block-level
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# tags like paragraphs, headers, and list items.
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#
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# Process character escapes, code spans, and inline HTML
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# in one shot.
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"parseSpan" => -30,
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# Process anchor and image tags. Images must come first,
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# because ![foo][f] looks like an anchor.
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"doImages" => 10,
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"doAnchors" => 20,
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# Make links out of things like `<http://example.com/>`
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# Must come after doAnchors, because you can use < and >
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# delimiters in inline links like [this](<url>).
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"doAutoLinks" => 30,
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"encodeAmpsAndAngles" => 40,
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"doItalicsAndBold" => 50,
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"doHardBreaks" => 60,
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);
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public function runSpanGamut($text) {
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#
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# Run span gamut tranformations.
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#
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foreach ($this->span_gamut as $method => $priority) {
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$text = $this->$method($text);
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}
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return $text;
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}
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public function doHardBreaks($text) {
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# Do hard breaks:
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return preg_replace_callback('/ {2,}\n/',
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array(&$this, '_doHardBreaks_callback'), $text);
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}
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public function _doHardBreaks_callback($matches) {
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return $this->hashPart("<br$this->empty_element_suffix\n");
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}
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public function doAnchors($text) {
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#
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# Turn Markdown link shortcuts into XHTML <a> tags.
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#
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if ($this->in_anchor) return $text;
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$this->in_anchor = true;
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#
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# First, handle reference-style links: [link text] [id]
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#
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$text = preg_replace_callback('{
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( # wrap whole match in $1
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\[
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('.$this->nested_brackets_re.') # link text = $2
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\]
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[ ]? # one optional space
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(?:\n[ ]*)? # one optional newline followed by spaces
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\[
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(.*?) # id = $3
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\]
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)
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}xs',
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array(&$this, '_doAnchors_reference_callback'), $text);
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#
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# Next, inline-style links: [link text](url "optional title")
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#
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$text = preg_replace_callback('{
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( # wrap whole match in $1
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\[
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('.$this->nested_brackets_re.') # link text = $2
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\]
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\( # literal paren
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[ \n]*
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(?:
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<(.+?)> # href = $3
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|
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('.$this->nested_url_parenthesis_re.') # href = $4
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)
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[ \n]*
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( # $5
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([\'"]) # quote char = $6
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(.*?) # Title = $7
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\6 # matching quote
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[ \n]* # ignore any spaces/tabs between closing quote and )
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)? # title is optional
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\)
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)
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}xs',
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array(&$this, '_doAnchors_inline_callback'), $text);
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#
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# Last, handle reference-style shortcuts: [link text]
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# These must come last in case you've also got [link text][1]
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# or [link text](/foo)
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#
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$text = preg_replace_callback('{
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( # wrap whole match in $1
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\[
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([^\[\]]+) # link text = $2; can\'t contain [ or ]
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\]
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)
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}xs',
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array(&$this, '_doAnchors_reference_callback'), $text);
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$this->in_anchor = false;
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return $text;
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}
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public function _doAnchors_reference_callback($matches) {
|
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$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 $result;
|
|
}
|
|
public function _doAnchors_inline_callback($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 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: 
|
|
# 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
|
|
\( # literal paren
|
|
[ \n]*
|
|
(?:
|
|
<(\S*)> # src url = $3
|
|
|
|
|
('.$this->nested_url_parenthesis_re.') # src url = $4
|
|
)
|
|
[ \n]*
|
|
( # $5
|
|
([\'"]) # quote char = $6
|
|
(.*?) # title = $7
|
|
\6 # matching quote
|
|
[ \n]*
|
|
)? # title is optional
|
|
\)
|
|
)
|
|
}xs',
|
|
array(&$this, '_doImages_inline_callback'), $text);
|
|
|
|
return $text;
|
|
}
|
|
public function _doImages_reference_callback($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 $result;
|
|
}
|
|
public function _doImages_inline_callback($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 function doHeaders($text) {
|
|
# Setext-style headers:
|
|
# Header 1
|
|
# ========
|
|
#
|
|
# Header 2
|
|
# --------
|
|
#
|
|
$text = preg_replace_callback('{ ^(.+?)[ ]*\n(=+|-+)[ ]*\n+ }mx',
|
|
array(&$this, '_doHeaders_callback_setext'), $text);
|
|
|
|
# atx-style headers:
|
|
# # Header 1
|
|
# ## Header 2
|
|
# ## Header 2 with closing hashes ##
|
|
# ...
|
|
# ###### Header 6
|
|
#
|
|
$text = preg_replace_callback('{
|
|
^(\#{1,6}) # $1 = string of #\'s
|
|
[ ]*
|
|
(.+?) # $2 = Header text
|
|
[ ]*
|
|
\#* # optional closing #\'s (not counted)
|
|
\n+
|
|
}xm',
|
|
array(&$this, '_doHeaders_callback_atx'), $text);
|
|
|
|
return $text;
|
|
}
|
|
public function _doHeaders_callback_setext($matches) {
|
|
# Terrible hack to check we haven't found an empty list item.
|
|
if ($matches[2] == '-' && preg_match('{^-(?: |$)}', $matches[1]))
|
|
return $matches[0];
|
|
|
|
$level = $matches[2]{0} == '=' ? 1 : 2;
|
|
$block = "<h$level>".$this->runSpanGamut($matches[1])."</h$level>";
|
|
return "\n" . $this->hashBlock($block) . "\n\n";
|
|
}
|
|
public function _doHeaders_callback_atx($matches) {
|
|
$level = strlen($matches[1]);
|
|
$block = "<h$level>".$this->runSpanGamut($matches[2])."</h$level>";
|
|
return "\n" . $this->hashBlock($block) . "\n\n";
|
|
}
|
|
|
|
|
|
public 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,
|
|
$marker_ol_re => $marker_ul_re,
|
|
);
|
|
|
|
foreach ($markers_relist as $marker_re => $other_marker_re) {
|
|
# Re-usable pattern to match any entirel ul or ol list:
|
|
$whole_list_re = '
|
|
( # $1 = whole list
|
|
( # $2
|
|
([ ]{0,'.$less_than_tab.'}) # $3 = number of spaces
|
|
('.$marker_re.') # $4 = first list item marker
|
|
[ ]+
|
|
)
|
|
(?s:.+?)
|
|
( # $5
|
|
\z
|
|
|
|
|
\n{2,}
|
|
(?=\S)
|
|
(?! # Negative lookahead for another list item marker
|
|
[ ]*
|
|
'.$marker_re.'[ ]+
|
|
)
|
|
|
|
|
(?= # Lookahead for another kind of list
|
|
\n
|
|
\3 # Must have the same indentation
|
|
'.$other_marker_re.'[ ]+
|
|
)
|
|
)
|
|
)
|
|
'; // mx
|
|
|
|
# We use a different prefix before nested lists than top-level lists.
|
|
# See extended comment in _ProcessListItems().
|
|
|
|
if ($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 $text;
|
|
}
|
|
|
|
public function _doLists_callback($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[4]) ? "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";
|
|
}
|
|
|
|
var $list_level = 0;
|
|
|
|
public function processListItems($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 $list_str;
|
|
}
|
|
public function _processListItems_callback($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>" . $item . "</li>\n";
|
|
}
|
|
|
|
|
|
public function doCodeBlocks($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 $text;
|
|
}
|
|
public function _doCodeBlocks_callback($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 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 $em_relist = array(
|
|
'' => '(?:(?<!\*)\*(?!\*)|(?<!_)_(?!_))(?=\S|$)(?![\.,:;]\s)',
|
|
'*' => '(?<=\S|^)(?<!\*)\*(?!\*)',
|
|
'_' => '(?<=\S|^)(?<!_)_(?!_)',
|
|
);
|
|
public $strong_relist = array(
|
|
'' => '(?:(?<!\*)\*\*(?!\*)|(?<!_)__(?!_))(?=\S|$)(?![\.,:;]\s)',
|
|
'**' => '(?<=\S|^)(?<!\*)\*\*(?!\*)',
|
|
'__' => '(?<=\S|^)(?<!_)__(?!_)',
|
|
);
|
|
public $em_strong_relist = array(
|
|
'' => '(?:(?<!\*)\*\*\*(?!\*)|(?<!_)___(?!_))(?=\S|$)(?![\.,:;]\s)',
|
|
'***' => '(?<=\S|^)(?<!\*)\*\*\*(?!\*)',
|
|
'___' => '(?<=\S|^)(?<!_)___(?!_)',
|
|
);
|
|
public $em_strong_prepared_relist;
|
|
|
|
public function prepareItalicsAndBold() {
|
|
#
|
|
# Prepare regular expressions for searching emphasis tokens in any
|
|
# context.
|
|
#
|
|
foreach ($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"] = $token_re;
|
|
}
|
|
}
|
|
}
|
|
|
|
public function doItalicsAndBold($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 search 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 $text_stack[0];
|
|
}
|
|
|
|
|
|
public function doBlockQuotes($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 $text;
|
|
}
|
|
|
|
public function _doBlockQuotes_callback($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 function _doBlockQuotes_callback2($matches) {
|
|
$pre = $matches[1];
|
|
$pre = preg_replace('/^ /m', '', $pre);
|
|
return $pre;
|
|
}
|
|
|
|
|
|
public function formParagraphs($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 => $value) {
|
|
if (!preg_match('/^B\x1A[0-9]+B$/', $value)) {
|
|
# Is a paragraph.
|
|
$value = $this->runSpanGamut($value);
|
|
$value = preg_replace('/^([ ]*)/', "<p>", $value);
|
|
$value .= "</p>";
|
|
$grafs[$key] = $this->unhash($value);
|
|
}
|
|
else {
|
|
# Is a block.
|
|
# Modify elements of @grafs in-place...
|
|
$graf = $value;
|
|
$block = $this->html_hashes[$graf];
|
|
$graf = $block;
|
|
// if (preg_match('{
|
|
// \A
|
|
// ( # $1 = <div> tag
|
|
// <div \s+
|
|
// [^>]*
|
|
// \b
|
|
// markdown\s*=\s* ([\'"]) # $2 = attr quote char
|
|
// 1
|
|
// \2
|
|
// [^>]*
|
|
// >
|
|
// )
|
|
// ( # $3 = contents
|
|
// .*
|
|
// )
|
|
// (</div>) # $4 = closing tag
|
|
// \z
|
|
// }xs', $block, $matches))
|
|
// {
|
|
// list(, $div_open, , $div_content, $div_close) = $matches;
|
|
//
|
|
// # We can't call Markdown(), because that resets the hash;
|
|
// # that initialization code should be pulled into its own sub, though.
|
|
// $div_content = $this->hashHTMLBlocks($div_content);
|
|
//
|
|
// # Run document gamut methods on the content.
|
|
// foreach ($this->document_gamut as $method => $priority) {
|
|
// $div_content = $this->$method($div_content);
|
|
// }
|
|
//
|
|
// $div_open = preg_replace(
|
|
// '{\smarkdown\s*=\s*([\'"]).+?\1}', '', $div_open);
|
|
//
|
|
// $graf = $div_open . "\n" . $div_content . "\n" . $div_close;
|
|
// }
|
|
$grafs[$key] = $graf;
|
|
}
|
|
}
|
|
|
|
return implode("\n\n", $grafs);
|
|
}
|
|
|
|
|
|
public function encodeAttribute($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('"', '"', $text);
|
|
return $text;
|
|
}
|
|
|
|
|
|
public function encodeAmpsAndAngles($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('&', '&', $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+);)/',
|
|
'&', $text);;
|
|
}
|
|
# Encode remaining <'s
|
|
$text = str_replace('<', '<', $text);
|
|
|
|
return $text;
|
|
}
|
|
|
|
|
|
public function doAutoLinks($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]+
|
|
|
|
|
\[[\d.a-fA-F:]+\] # IPv4 & IPv6
|
|
)
|
|
)
|
|
>
|
|
}xi',
|
|
array(&$this, '_doAutoLinks_email_callback'), $text);
|
|
|
|
return $text;
|
|
}
|
|
public function _doAutoLinks_url_callback($matches) {
|
|
$url = $this->encodeAttribute($matches[1]);
|
|
$link = "<a href=\"$url\">$url</a>";
|
|
return $this->hashPart($link);
|
|
}
|
|
public function _doAutoLinks_email_callback($matches) {
|
|
$address = $matches[1];
|
|
$link = $this->encodeEmailAddress($address);
|
|
return $this->hashPart($link);
|
|
}
|
|
|
|
|
|
public 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="mailto:foo
|
|
# @example.co
|
|
# m">foo@exampl
|
|
# e.com</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 $addr;
|
|
}
|
|
|
|
|
|
public function parseSpan($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 $output;
|
|
}
|
|
|
|
|
|
public function handleSpanToken($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 function outdent($text) {
|
|
#
|
|
# Remove one level of line-leading tabs or spaces
|
|
#
|
|
return preg_replace('/^(\t|[ ]{1,'.$this->tab_width.'})/m', '', $text);
|
|
}
|
|
|
|
|
|
# String length function for detab. `_initDetab` will create a function to
|
|
# hanlde UTF-8 if the default function does not exist.
|
|
public $utf8_strlen = 'mb_strlen';
|
|
|
|
public function detab($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 $text;
|
|
}
|
|
public function _detab_callback($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 $line;
|
|
}
|
|
public function _initDetab() {
|
|
#
|
|
# Check for the availability of the function in the `utf8_strlen` property
|
|
# (initially `mb_strlen`). If the function is not available, create a
|
|
# function that will loosely count the number of UTF-8 characters with a
|
|
# regular expression.
|
|
#
|
|
if (function_exists($this->utf8_strlen)) return;
|
|
$this->utf8_strlen = create_function('$text', 'return preg_match_all(
|
|
"/[\\\\x00-\\\\xBF]|[\\\\xC0-\\\\xFF][\\\\x80-\\\\xBF]*/",
|
|
$text, $m);');
|
|
}
|
|
|
|
|
|
public function unhash($text) {
|
|
#
|
|
# Swap back in all the tags hashed by _HashHTMLBlocks.
|
|
#
|
|
return preg_replace_callback('/(.)\x1A[0-9]+\1/',
|
|
array(&$this, '_unhash_callback'), $text);
|
|
}
|
|
public function _unhash_callback($matches) {
|
|
return $this->html_hashes[$matches[0]];
|
|
}
|
|
|
|
}
|
|
|
|
|
|
#
|
|
# Markdown Extra Parser Class
|
|
#
|
|
|
|
class MarkdownExtra_Parser extends Markdown_Parser {
|
|
|
|
# Prefix for footnote ids.
|
|
public $fn_id_prefix = "";
|
|
|
|
# Optional title attribute for footnote links and backlinks.
|
|
public $fn_link_title = '';
|
|
public $fn_backlink_title = '';
|
|
|
|
# Optional class attribute for footnote links and backlinks.
|
|
public $fn_link_class = '';
|
|
public $fn_backlink_class = '';
|
|
|
|
# Predefined abbreviations.
|
|
public $predef_abbr = array();
|
|
|
|
|
|
public function __construct() {
|
|
#
|
|
# 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::__construct();
|
|
}
|
|
|
|
|
|
# Extra variables used during extra transformations.
|
|
public $footnotes = array();
|
|
public $footnotes_ordered = array();
|
|
public $abbr_desciptions = array();
|
|
public $abbr_word_re = '';
|
|
|
|
# Give the current footnote number.
|
|
public $footnote_counter = 1;
|
|
|
|
|
|
public 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 function teardown() {
|
|
#
|
|
# Clearing Extra-specific variables.
|
|
#
|
|
$this->footnotes = array();
|
|
$this->footnotes_ordered = array();
|
|
$this->abbr_desciptions = array();
|
|
$this->abbr_word_re = '';
|
|
|
|
parent::teardown();
|
|
}
|
|
|
|
|
|
### HTML Block Parser ###
|
|
|
|
# Tags that are always treated as block tags:
|
|
public $block_tags_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|form|fieldset|iframe|hr|legend';
|
|
|
|
# Tags treated as block tags only if the opening tag is alone on it's line:
|
|
public $context_block_tags_re = 'script|noscript|math|ins|del';
|
|
|
|
# Tags where markdown="1" default to span mode:
|
|
public $contain_span_tags_re = 'p|h[1-6]|li|dd|dt|td|th|legend|address';
|
|
|
|
# Tags which must not have their contents modified, no matter where
|
|
# they appear:
|
|
public $clean_tags_re = 'script|math';
|
|
|
|
# Tags that do not need to be closed.
|
|
public $auto_close_tags_re = 'hr|img';
|
|
|
|
|
|
public function hashHTMLBlocks($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 $text;
|
|
}
|
|
public function _hashHTMLBlocks_inMarkdown($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
|
|
(?>
|
|
(?: [ ]{'.($indent+4).'}[^\n]* | [ ]* ) \n
|
|
)*
|
|
|
|
|
# Fenced code block marker
|
|
(?> ^ | \n )
|
|
[ ]{0,'.($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 .= $tag;
|
|
}
|
|
}
|
|
#
|
|
# Check for: Fenced code block marker.
|
|
#
|
|
else if (preg_match('{^\n?[ ]{0,'.($indent+3).'}~}', $tag)) {
|
|
# Fenced code block marker: find matching end marker.
|
|
$tag_re = preg_quote(trim($tag));
|
|
if (preg_match('{^(?>.*\n)+?[ ]{0,'.($indent).'}'.$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 .= $tag;
|
|
}
|
|
}
|
|
#
|
|
# Check for: Indented code block.
|
|
#
|
|
else if ($tag{0} == "\n" || $tag{0} == " ") {
|
|
# Indented code block: pass it unchanged, will be handled
|
|
# later.
|
|
$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, $text);
|
|
}
|
|
public function _hashHTMLBlocks_inHTML($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, $text);
|
|
}
|
|
|
|
|
|
public function hashClean($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 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 $text;
|
|
}
|
|
public function _doHeaders_attr($attr) {
|
|
if (empty($attr)) return "";
|
|
return " id=\"$attr\"";
|
|
}
|
|
public 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]);
|
|
$block = "<h$level$attr>".$this->runSpanGamut($matches[1])."</h$level>";
|
|
return "\n" . $this->hashBlock($block) . "\n\n";
|
|
}
|
|
public function _doHeaders_callback_atx($matches) {
|
|
$level = strlen($matches[1]);
|
|
$attr = $this->_doHeaders_attr($id =& $matches[3]);
|
|
$block = "<h$level$attr>".$this->runSpanGamut($matches[2])."</h$level>";
|
|
return "\n" . $this->hashBlock($block) . "\n\n";
|
|
}
|
|
|
|
|
|
public 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 $text;
|
|
}
|
|
public function _doTable_leadingPipe_callback($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, $content));
|
|
}
|
|
public function _doTable_callback($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 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 $text;
|
|
}
|
|
public function _doDefLists_callback($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 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 $list_str;
|
|
}
|
|
public function _processDefListItems_callback_dt($matches) {
|
|
$terms = explode("\n", trim($matches[1]));
|
|
$text = '';
|
|
foreach ($terms as $term) {
|
|
$term = $this->runSpanGamut(trim($term));
|
|
$text .= "\n<dt>" . $term . "</dt>";
|
|
}
|
|
return $text . "\n";
|
|
}
|
|
public function _processDefListItems_callback_dd($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>" . $def . "</dd>\n";
|
|
}
|
|
|
|
|
|
public function doFencedCodeBlocks($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 $text;
|
|
}
|
|
public function _doFencedCodeBlocks_callback($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 function _doFencedCodeBlocks_newlines($matches) {
|
|
return str_repeat("<br$this->empty_element_suffix",
|
|
strlen($matches[0]));
|
|
}
|
|
|
|
|
|
#
|
|
# Redefining emphasis markers so that emphasis by underscore does not
|
|
# work in the middle of a word.
|
|
#
|
|
public $em_relist = array(
|
|
'' => '(?:(?<!\*)\*(?!\*)|(?<![a-zA-Z0-9_])_(?!_))(?=\S|$)(?![\.,:;]\s)',
|
|
'*' => '(?<=\S|^)(?<!\*)\*(?!\*)',
|
|
'_' => '(?<=\S|^)(?<!_)_(?![a-zA-Z0-9_])',
|
|
);
|
|
public $strong_relist = array(
|
|
'' => '(?:(?<!\*)\*\*(?!\*)|(?<![a-zA-Z0-9_])__(?!_))(?=\S|$)(?![\.,:;]\s)',
|
|
'**' => '(?<=\S|^)(?<!\*)\*\*(?!\*)',
|
|
'__' => '(?<=\S|^)(?<!_)__(?![a-zA-Z0-9_])',
|
|
);
|
|
public $em_strong_relist = array(
|
|
'' => '(?:(?<!\*)\*\*\*(?!\*)|(?<![a-zA-Z0-9_])___(?!_))(?=\S|$)(?![\.,:;]\s)',
|
|
'***' => '(?<=\S|^)(?<!\*)\*\*\*(?!\*)',
|
|
'___' => '(?<=\S|^)(?<!_)___(?![a-zA-Z0-9_])',
|
|
);
|
|
|
|
|
|
public 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 $text;
|
|
}
|
|
|
|
|
|
### Footnotes
|
|
|
|
public function stripFootnotes($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 $text;
|
|
}
|
|
public function _stripFootnotes_callback($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 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 $text;
|
|
}
|
|
|
|
|
|
public function appendFootnotes($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". $this->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\"$attr>↩</a>";
|
|
if (preg_match('{</p>$}', $footnote)) {
|
|
$footnote = substr($footnote, 0, -4) . " $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 $text;
|
|
}
|
|
public function _appendFootnotes_callback($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 "[^".$matches[1]."]";
|
|
}
|
|
|
|
|
|
### Abbreviations ###
|
|
|
|
public function stripAbbreviations($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 $text;
|
|
}
|
|
public function _stripAbbreviations_callback($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($abbr_desc);
|
|
return ''; # String that will replace the block
|
|
}
|
|
|
|
|
|
public function doAbbreviations($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 $text;
|
|
}
|
|
public function _doAbbreviations_callback($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];
|
|
}
|
|
}
|
|
|
|
}
|