forked from GNUsocial/gnu-social
1626 lines
47 KiB
PHP
1626 lines
47 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) 2004-2015 Michel Fortin
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# <https://michelf.ca/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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# <https://daringfireball.net/projects/markdown/>
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#
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namespace Michelf;
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#
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# Markdown Extra Parser Class
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#
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class MarkdownExtra extends \Michelf\Markdown {
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### Configuration Variables ###
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# Prefix for footnote ids.
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public $fn_id_prefix = "";
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# Optional title attribute for footnote links and backlinks.
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public $fn_link_title = "";
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public $fn_backlink_title = "";
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# Optional class attribute for footnote links and backlinks.
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public $fn_link_class = "footnote-ref";
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public $fn_backlink_class = "footnote-backref";
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# Content to be displayed within footnote backlinks. The default is '↩';
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# the U+FE0E on the end is a Unicode variant selector used to prevent iOS
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# from displaying the arrow character as an emoji.
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public $fn_backlink_html = '↩︎';
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# Class name for table cell alignment (%% replaced left/center/right)
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# For instance: 'go-%%' becomes 'go-left' or 'go-right' or 'go-center'
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# If empty, the align attribute is used instead of a class name.
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public $table_align_class_tmpl = '';
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# Optional class prefix for fenced code block.
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public $code_class_prefix = "";
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# Class attribute for code blocks goes on the `code` tag;
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# setting this to true will put attributes on the `pre` tag instead.
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public $code_attr_on_pre = false;
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# Predefined abbreviations.
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public $predef_abbr = array();
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### Parser Implementation ###
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public function __construct() {
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#
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# Constructor function. Initialize the parser object.
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#
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# Add extra escapable characters before parent constructor
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# initialize the table.
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$this->escape_chars .= ':|';
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# Insert extra document, block, and span transformations.
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# Parent constructor will do the sorting.
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$this->document_gamut += array(
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"doFencedCodeBlocks" => 5,
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"stripFootnotes" => 15,
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"stripAbbreviations" => 25,
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"appendFootnotes" => 50,
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);
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$this->block_gamut += array(
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"doFencedCodeBlocks" => 5,
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"doTables" => 15,
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"doDefLists" => 45,
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);
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$this->span_gamut += array(
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"doFootnotes" => 5,
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"doAbbreviations" => 70,
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);
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$this->enhanced_ordered_list = true;
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parent::__construct();
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}
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# Extra variables used during extra transformations.
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protected $footnotes = array();
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protected $footnotes_ordered = array();
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protected $footnotes_ref_count = array();
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protected $footnotes_numbers = array();
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protected $abbr_desciptions = array();
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protected $abbr_word_re = '';
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# Give the current footnote number.
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protected $footnote_counter = 1;
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protected function setup() {
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#
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# Setting up Extra-specific variables.
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#
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parent::setup();
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$this->footnotes = array();
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$this->footnotes_ordered = array();
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$this->footnotes_ref_count = array();
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$this->footnotes_numbers = array();
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$this->abbr_desciptions = array();
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$this->abbr_word_re = '';
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$this->footnote_counter = 1;
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foreach ($this->predef_abbr as $abbr_word => $abbr_desc) {
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if ($this->abbr_word_re)
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$this->abbr_word_re .= '|';
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$this->abbr_word_re .= preg_quote($abbr_word);
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$this->abbr_desciptions[$abbr_word] = trim($abbr_desc);
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}
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}
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protected function teardown() {
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#
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# Clearing Extra-specific variables.
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#
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$this->footnotes = array();
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$this->footnotes_ordered = array();
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$this->footnotes_ref_count = array();
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$this->footnotes_numbers = array();
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$this->abbr_desciptions = array();
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$this->abbr_word_re = '';
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parent::teardown();
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}
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### Extra Attribute Parser ###
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# Expression to use to catch attributes (includes the braces)
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protected $id_class_attr_catch_re = '\{((?>[ ]*[#.a-z][-_:a-zA-Z0-9=]+){1,})[ ]*\}';
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# Expression to use when parsing in a context when no capture is desired
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protected $id_class_attr_nocatch_re = '\{(?>[ ]*[#.a-z][-_:a-zA-Z0-9=]+){1,}[ ]*\}';
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protected function doExtraAttributes($tag_name, $attr, $defaultIdValue = null, $classes = array()) {
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#
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# Parse attributes caught by the $this->id_class_attr_catch_re expression
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# and return the HTML-formatted list of attributes.
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#
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# Currently supported attributes are .class and #id.
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#
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# In addition, this method also supports supplying a default Id value,
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# which will be used to populate the id attribute in case it was not
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# overridden.
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if (empty($attr) && !$defaultIdValue && empty($classes)) return "";
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# Split on components
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preg_match_all('/[#.a-z][-_:a-zA-Z0-9=]+/', $attr, $matches);
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$elements = $matches[0];
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# handle classes and ids (only first id taken into account)
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$attributes = array();
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$id = false;
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foreach ($elements as $element) {
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if ($element{0} == '.') {
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$classes[] = substr($element, 1);
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} else if ($element{0} == '#') {
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if ($id === false) $id = substr($element, 1);
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} else if (strpos($element, '=') > 0) {
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$parts = explode('=', $element, 2);
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$attributes[] = $parts[0] . '="' . $parts[1] . '"';
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}
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}
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if (!$id) $id = $defaultIdValue;
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# compose attributes as string
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$attr_str = "";
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if (!empty($id)) {
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$attr_str .= ' id="'.$this->encodeAttribute($id) .'"';
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}
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if (!empty($classes)) {
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$attr_str .= ' class="'. implode(" ", $classes) . '"';
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}
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if (!$this->no_markup && !empty($attributes)) {
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$attr_str .= ' '.implode(" ", $attributes);
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}
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return $attr_str;
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}
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protected function stripLinkDefinitions($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 = $4
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[")]
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[ ]*
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)? # title is optional
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(?:[ ]* '.$this->id_class_attr_catch_re.' )? # $5 = extra id & class attr
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(?:\n+|\Z)
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}xm',
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array($this, '_stripLinkDefinitions_callback'),
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$text);
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return $text;
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}
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protected function _stripLinkDefinitions_callback($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] =& $matches[4];
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$this->ref_attr[$link_id] = $this->doExtraAttributes("", $dummy =& $matches[5]);
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return ''; # String that will replace the block
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}
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### HTML Block Parser ###
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# Tags that are always treated as block tags:
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protected $block_tags_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|form|fieldset|iframe|hr|legend|article|section|nav|aside|hgroup|header|footer|figcaption|figure';
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# Tags treated as block tags only if the opening tag is alone on its line:
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protected $context_block_tags_re = 'script|noscript|style|ins|del|iframe|object|source|track|param|math|svg|canvas|audio|video';
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# Tags where markdown="1" default to span mode:
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protected $contain_span_tags_re = 'p|h[1-6]|li|dd|dt|td|th|legend|address';
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# Tags which must not have their contents modified, no matter where
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# they appear:
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protected $clean_tags_re = 'script|style|math|svg';
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# Tags that do not need to be closed.
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protected $auto_close_tags_re = 'hr|img|param|source|track';
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protected function hashHTMLBlocks($text) {
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#
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# Hashify HTML Blocks and "clean tags".
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#
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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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# This works by calling _HashHTMLBlocks_InMarkdown, which then calls
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# _HashHTMLBlocks_InHTML when it encounter block tags. When the markdown="1"
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# attribute is found within a tag, _HashHTMLBlocks_InHTML calls back
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# _HashHTMLBlocks_InMarkdown to handle the Markdown syntax within the tag.
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# These two functions are calling each other. It's recursive!
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#
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if ($this->no_markup) return $text;
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#
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# Call the HTML-in-Markdown hasher.
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#
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list($text, ) = $this->_hashHTMLBlocks_inMarkdown($text);
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return $text;
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}
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protected function _hashHTMLBlocks_inMarkdown($text, $indent = 0,
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$enclosing_tag_re = '', $span = false)
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{
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#
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# Parse markdown text, calling _HashHTMLBlocks_InHTML for block tags.
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#
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# * $indent is the number of space to be ignored when checking for code
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# blocks. This is important because if we don't take the indent into
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# account, something like this (which looks right) won't work as expected:
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#
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# <div>
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# <div markdown="1">
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# Hello World. <-- Is this a Markdown code block or text?
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# </div> <-- Is this a Markdown code block or a real tag?
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# <div>
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#
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# If you don't like this, just don't indent the tag on which
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# you apply the markdown="1" attribute.
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#
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# * If $enclosing_tag_re is not empty, stops at the first unmatched closing
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# tag with that name. Nested tags supported.
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#
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# * If $span is true, text inside must treated as span. So any double
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# newline will be replaced by a single newline so that it does not create
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# paragraphs.
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#
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# Returns an array of that form: ( processed text , remaining text )
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#
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if ($text === '') return array('', '');
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# Regex to check for the presense of newlines around a block tag.
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$newline_before_re = '/(?:^\n?|\n\n)*$/';
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$newline_after_re =
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'{
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^ # Start of text following the tag.
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(?>[ ]*<!--.*?-->)? # Optional comment.
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[ ]*\n # Must be followed by newline.
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}xs';
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# Regex to match any tag.
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$block_tag_re =
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'{
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( # $2: Capture whole tag.
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</? # Any opening or closing tag.
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(?> # Tag name.
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'.$this->block_tags_re.' |
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'.$this->context_block_tags_re.' |
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'.$this->clean_tags_re.' |
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(?!\s)'.$enclosing_tag_re.'
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)
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(?:
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(?=[\s"\'/a-zA-Z0-9]) # Allowed characters after tag name.
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(?>
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".*?" | # Double quotes (can contain `>`)
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\'.*?\' | # Single quotes (can contain `>`)
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.+? # Anything but quotes and `>`.
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)*?
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)?
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> # End of tag.
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<!-- .*? --> # HTML Comment
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<\?.*?\?> | <%.*?%> # Processing instruction
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<!\[CDATA\[.*?\]\]> # CData Block
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'. ( !$span ? ' # If not in span.
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# Indented code block
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(?: ^[ ]*\n | ^ | \n[ ]*\n )
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[ ]{'.($indent+4).'}[^\n]* \n
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(?>
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(?: [ ]{'.($indent+4).'}[^\n]* | [ ]* ) \n
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)*
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# Fenced code block marker
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(?<= ^ | \n )
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[ ]{0,'.($indent+3).'}(?:~{3,}|`{3,})
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[ ]*
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(?: \.?[-_:a-zA-Z0-9]+ )? # standalone class name
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[ ]*
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(?: '.$this->id_class_attr_nocatch_re.' )? # extra attributes
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[ ]*
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(?= \n )
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' : '' ). ' # End (if not is span).
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# Code span marker
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# Note, this regex needs to go after backtick fenced
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# code blocks but it should also be kept outside of the
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# "if not in span" condition adding backticks to the parser
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`+
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)
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}xs';
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$depth = 0; # Current depth inside the tag tree.
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$parsed = ""; # Parsed text that will be returned.
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#
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# Loop through every tag until we find the closing tag of the parent
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# or loop until reaching the end of text if no parent tag specified.
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#
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do {
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#
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# Split the text using the first $tag_match pattern found.
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# Text before pattern will be first in the array, text after
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# pattern will be at the end, and between will be any catches made
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# by the pattern.
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#
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$parts = preg_split($block_tag_re, $text, 2,
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PREG_SPLIT_DELIM_CAPTURE);
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# If in Markdown span mode, add a empty-string span-level hash
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# after each newline to prevent triggering any block element.
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if ($span) {
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$void = $this->hashPart("", ':');
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$newline = "$void\n";
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$parts[0] = $void . str_replace("\n", $newline, $parts[0]) . $void;
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}
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$parsed .= $parts[0]; # Text before current tag.
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# If end of $text has been reached. Stop loop.
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if (count($parts) < 3) {
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$text = "";
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break;
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}
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$tag = $parts[1]; # Tag to handle.
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$text = $parts[2]; # Remaining text after current tag.
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$tag_re = preg_quote($tag); # For use in a regular expression.
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#
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# Check for: Fenced code block marker.
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# Note: need to recheck the whole tag to disambiguate backtick
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# fences from code spans
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#
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if (preg_match('{^\n?([ ]{0,'.($indent+3).'})(~{3,}|`{3,})[ ]*(?:\.?[-_:a-zA-Z0-9]+)?[ ]*(?:'.$this->id_class_attr_nocatch_re.')?[ ]*\n?$}', $tag, $capture)) {
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# Fenced code block marker: find matching end marker.
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$fence_indent = strlen($capture[1]); # use captured indent in re
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$fence_re = $capture[2]; # use captured fence in re
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if (preg_match('{^(?>.*\n)*?[ ]{'.($fence_indent).'}'.$fence_re.'[ ]*(?:\n|$)}', $text,
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$matches))
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{
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# End marker found: pass text unchanged until marker.
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$parsed .= $tag . $matches[0];
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$text = substr($text, strlen($matches[0]));
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}
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else {
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# No end marker: just skip it.
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$parsed .= $tag;
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}
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}
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#
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# Check for: Indented code block.
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#
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else if ($tag{0} == "\n" || $tag{0} == " ") {
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# Indented code block: pass it unchanged, will be handled
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# later.
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$parsed .= $tag;
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}
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#
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# Check for: Code span marker
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# Note: need to check this after backtick fenced code blocks
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#
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else if ($tag{0} == "`") {
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# Find corresponding end marker.
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$tag_re = preg_quote($tag);
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if (preg_match('{^(?>.+?|\n(?!\n))*?(?<!`)'.$tag_re.'(?!`)}',
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$text, $matches))
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{
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# End marker found: pass text unchanged until marker.
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$parsed .= $tag . $matches[0];
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$text = substr($text, strlen($matches[0]));
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}
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else {
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# Unmatched marker: just skip it.
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$parsed .= $tag;
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}
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}
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#
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# Check for: Opening Block level tag or
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# Opening Context Block tag (like ins and del)
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# used as a block tag (tag is alone on it's line).
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#
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else if (preg_match('{^<(?:'.$this->block_tags_re.')\b}', $tag) ||
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( preg_match('{^<(?:'.$this->context_block_tags_re.')\b}', $tag) &&
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preg_match($newline_before_re, $parsed) &&
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preg_match($newline_after_re, $text) )
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)
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{
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# Need to parse tag and following text using the HTML parser.
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list($block_text, $text) =
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$this->_hashHTMLBlocks_inHTML($tag . $text, "hashBlock", true);
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# Make sure it stays outside of any paragraph by adding newlines.
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$parsed .= "\n\n$block_text\n\n";
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}
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#
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# Check for: Clean tag (like script, math)
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# HTML Comments, processing instructions.
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#
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else if (preg_match('{^<(?:'.$this->clean_tags_re.')\b}', $tag) ||
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$tag{1} == '!' || $tag{1} == '?')
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{
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# Need to parse tag and following text using the HTML parser.
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# (don't check for markdown attribute)
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list($block_text, $text) =
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$this->_hashHTMLBlocks_inHTML($tag . $text, "hashClean", false);
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$parsed .= $block_text;
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}
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#
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# Check for: Tag with same name as enclosing tag.
|
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#
|
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else if ($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, $text);
|
|
}
|
|
protected function _hashHTMLBlocks_inHTML($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 = '{
|
|
( # $2: Capture whole tag.
|
|
</? # Any opening or closing tag.
|
|
[\w:$]+ # 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 with 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, $text);
|
|
}
|
|
|
|
|
|
protected function hashClean($text) {
|
|
#
|
|
# Called whenever a tag must be hashed when a function inserts a "clean" tag
|
|
# in $text, it passes through this function and is automaticaly escaped,
|
|
# blocking invalid nested overlap.
|
|
#
|
|
return $this->hashPart($text, 'C');
|
|
}
|
|
|
|
|
|
protected function doAnchors($text) {
|
|
#
|
|
# Turn Markdown link shortcuts into XHTML <a> tags.
|
|
#
|
|
if ($this->in_anchor) return $text;
|
|
$this->in_anchor = true;
|
|
|
|
#
|
|
# First, handle reference-style links: [link text] [id]
|
|
#
|
|
$text = preg_replace_callback('{
|
|
( # wrap whole match in $1
|
|
\[
|
|
('.$this->nested_brackets_re.') # link text = $2
|
|
\]
|
|
|
|
[ ]? # one optional space
|
|
(?:\n[ ]*)? # one optional newline followed by spaces
|
|
|
|
\[
|
|
(.*?) # id = $3
|
|
\]
|
|
)
|
|
}xs',
|
|
array($this, '_doAnchors_reference_callback'), $text);
|
|
|
|
#
|
|
# Next, inline-style links: [link text](url "optional title")
|
|
#
|
|
$text = preg_replace_callback('{
|
|
( # wrap whole match in $1
|
|
\[
|
|
('.$this->nested_brackets_re.') # link text = $2
|
|
\]
|
|
\( # literal paren
|
|
[ \n]*
|
|
(?:
|
|
<(.+?)> # href = $3
|
|
|
|
|
('.$this->nested_url_parenthesis_re.') # href = $4
|
|
)
|
|
[ \n]*
|
|
( # $5
|
|
([\'"]) # quote char = $6
|
|
(.*?) # Title = $7
|
|
\6 # matching quote
|
|
[ \n]* # ignore any spaces/tabs between closing quote and )
|
|
)? # title is optional
|
|
\)
|
|
(?:[ ]? '.$this->id_class_attr_catch_re.' )? # $8 = id/class attributes
|
|
)
|
|
}xs',
|
|
array($this, '_doAnchors_inline_callback'), $text);
|
|
|
|
#
|
|
# Last, handle reference-style shortcuts: [link text]
|
|
# These must come last in case you've also got [link text][1]
|
|
# or [link text](/foo)
|
|
#
|
|
$text = preg_replace_callback('{
|
|
( # wrap whole match in $1
|
|
\[
|
|
([^\[\]]+) # link text = $2; can\'t contain [ or ]
|
|
\]
|
|
)
|
|
}xs',
|
|
array($this, '_doAnchors_reference_callback'), $text);
|
|
|
|
$this->in_anchor = false;
|
|
return $text;
|
|
}
|
|
protected function _doAnchors_reference_callback($matches) {
|
|
$whole_match = $matches[1];
|
|
$link_text = $matches[2];
|
|
$link_id =& $matches[3];
|
|
|
|
if ($link_id == "") {
|
|
# for shortcut links like [this][] or [this].
|
|
$link_id = $link_text;
|
|
}
|
|
|
|
# lower-case and turn embedded newlines into spaces
|
|
$link_id = strtolower($link_id);
|
|
$link_id = preg_replace('{[ ]?\n}', ' ', $link_id);
|
|
|
|
if (isset($this->urls[$link_id])) {
|
|
$url = $this->urls[$link_id];
|
|
$url = $this->encodeURLAttribute($url);
|
|
|
|
$result = "<a href=\"$url\"";
|
|
if ( isset( $this->titles[$link_id] ) ) {
|
|
$title = $this->titles[$link_id];
|
|
$title = $this->encodeAttribute($title);
|
|
$result .= " title=\"$title\"";
|
|
}
|
|
if (isset($this->ref_attr[$link_id]))
|
|
$result .= $this->ref_attr[$link_id];
|
|
|
|
$link_text = $this->runSpanGamut($link_text);
|
|
$result .= ">$link_text</a>";
|
|
$result = $this->hashPart($result);
|
|
}
|
|
else {
|
|
$result = $whole_match;
|
|
}
|
|
return $result;
|
|
}
|
|
protected function _doAnchors_inline_callback($matches) {
|
|
$whole_match = $matches[1];
|
|
$link_text = $this->runSpanGamut($matches[2]);
|
|
$url = $matches[3] == '' ? $matches[4] : $matches[3];
|
|
$title =& $matches[7];
|
|
$attr = $this->doExtraAttributes("a", $dummy =& $matches[8]);
|
|
|
|
// if the URL was of the form <s p a c e s> it got caught by the HTML
|
|
// tag parser and hashed. Need to reverse the process before using the URL.
|
|
$unhashed = $this->unhash($url);
|
|
if ($unhashed != $url)
|
|
$url = preg_replace('/^<(.*)>$/', '\1', $unhashed);
|
|
|
|
$url = $this->encodeURLAttribute($url);
|
|
|
|
$result = "<a href=\"$url\"";
|
|
if (isset($title)) {
|
|
$title = $this->encodeAttribute($title);
|
|
$result .= " title=\"$title\"";
|
|
}
|
|
$result .= $attr;
|
|
|
|
$link_text = $this->runSpanGamut($link_text);
|
|
$result .= ">$link_text</a>";
|
|
|
|
return $this->hashPart($result);
|
|
}
|
|
|
|
|
|
protected 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
|
|
\( # literal paren
|
|
[ \n]*
|
|
(?:
|
|
<(\S*)> # src url = $3
|
|
|
|
|
('.$this->nested_url_parenthesis_re.') # src url = $4
|
|
)
|
|
[ \n]*
|
|
( # $5
|
|
([\'"]) # quote char = $6
|
|
(.*?) # title = $7
|
|
\6 # matching quote
|
|
[ \n]*
|
|
)? # title is optional
|
|
\)
|
|
(?:[ ]? '.$this->id_class_attr_catch_re.' )? # $8 = id/class attributes
|
|
)
|
|
}xs',
|
|
array($this, '_doImages_inline_callback'), $text);
|
|
|
|
return $text;
|
|
}
|
|
protected function _doImages_reference_callback($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 = $this->encodeURLAttribute($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\"";
|
|
}
|
|
if (isset($this->ref_attr[$link_id]))
|
|
$result .= $this->ref_attr[$link_id];
|
|
$result .= $this->empty_element_suffix;
|
|
$result = $this->hashPart($result);
|
|
}
|
|
else {
|
|
# If there's no such link ID, leave intact:
|
|
$result = $whole_match;
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
protected function _doImages_inline_callback($matches) {
|
|
$whole_match = $matches[1];
|
|
$alt_text = $matches[2];
|
|
$url = $matches[3] == '' ? $matches[4] : $matches[3];
|
|
$title =& $matches[7];
|
|
$attr = $this->doExtraAttributes("img", $dummy =& $matches[8]);
|
|
|
|
$alt_text = $this->encodeAttribute($alt_text);
|
|
$url = $this->encodeURLAttribute($url);
|
|
$result = "<img src=\"$url\" alt=\"$alt_text\"";
|
|
if (isset($title)) {
|
|
$title = $this->encodeAttribute($title);
|
|
$result .= " title=\"$title\""; # $title already quoted
|
|
}
|
|
$result .= $attr;
|
|
$result .= $this->empty_element_suffix;
|
|
|
|
return $this->hashPart($result);
|
|
}
|
|
|
|
|
|
protected function doHeaders($text) {
|
|
#
|
|
# Redefined to add id and class attribute support.
|
|
#
|
|
# Setext-style headers:
|
|
# Header 1 {#header1}
|
|
# ========
|
|
#
|
|
# Header 2 {#header2 .class1 .class2}
|
|
# --------
|
|
#
|
|
$text = preg_replace_callback(
|
|
'{
|
|
(^.+?) # $1: Header text
|
|
(?:[ ]+ '.$this->id_class_attr_catch_re.' )? # $3 = id/class attributes
|
|
[ ]*\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.class1.class2}
|
|
# ...
|
|
# ###### Header 6 {.class2}
|
|
#
|
|
$text = preg_replace_callback('{
|
|
^(\#{1,6}) # $1 = string of #\'s
|
|
[ ]*
|
|
(.+?) # $2 = Header text
|
|
[ ]*
|
|
\#* # optional closing #\'s (not counted)
|
|
(?:[ ]+ '.$this->id_class_attr_catch_re.' )? # $3 = id/class attributes
|
|
[ ]*
|
|
\n+
|
|
}xm',
|
|
array($this, '_doHeaders_callback_atx'), $text);
|
|
|
|
return $text;
|
|
}
|
|
protected function _doHeaders_callback_setext($matches) {
|
|
if ($matches[3] == '-' && preg_match('{^- }', $matches[1]))
|
|
return $matches[0];
|
|
|
|
$level = $matches[3]{0} == '=' ? 1 : 2;
|
|
|
|
$defaultId = is_callable($this->header_id_func) ? call_user_func($this->header_id_func, $matches[1]) : null;
|
|
|
|
$attr = $this->doExtraAttributes("h$level", $dummy =& $matches[2], $defaultId);
|
|
$block = "<h$level$attr>".$this->runSpanGamut($matches[1])."</h$level>";
|
|
return "\n" . $this->hashBlock($block) . "\n\n";
|
|
}
|
|
protected function _doHeaders_callback_atx($matches) {
|
|
$level = strlen($matches[1]);
|
|
|
|
$defaultId = is_callable($this->header_id_func) ? call_user_func($this->header_id_func, $matches[2]) : null;
|
|
$attr = $this->doExtraAttributes("h$level", $dummy =& $matches[3], $defaultId);
|
|
$block = "<h$level$attr>".$this->runSpanGamut($matches[2])."</h$level>";
|
|
return "\n" . $this->hashBlock($block) . "\n\n";
|
|
}
|
|
|
|
|
|
protected 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 $text;
|
|
}
|
|
protected function _doTable_leadingPipe_callback($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, $content));
|
|
}
|
|
protected function _doTable_makeAlignAttr($alignname)
|
|
{
|
|
if (empty($this->table_align_class_tmpl))
|
|
return " align=\"$alignname\"";
|
|
|
|
$classname = str_replace('%%', $alignname, $this->table_align_class_tmpl);
|
|
return " class=\"$classname\"";
|
|
}
|
|
protected 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] = $this->_doTable_makeAlignAttr('right');
|
|
else if (preg_match('/^ *:-+: *$/', $s))
|
|
$attr[$n] = $this->_doTable_makeAlignAttr('center');
|
|
else if (preg_match('/^ *:-+ *$/', $s))
|
|
$attr[$n] = $this->_doTable_makeAlignAttr('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);
|
|
$attr = array_pad($attr, $col_count, '');
|
|
|
|
# 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";
|
|
}
|
|
|
|
|
|
protected 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 $text;
|
|
}
|
|
protected function _doDefLists_callback($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";
|
|
}
|
|
|
|
|
|
protected 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 $list_str;
|
|
}
|
|
protected function _processDefListItems_callback_dt($matches) {
|
|
$terms = explode("\n", trim($matches[1]));
|
|
$text = '';
|
|
foreach ($terms as $term) {
|
|
$term = $this->runSpanGamut(trim($term));
|
|
$text .= "\n<dt>" . $term . "</dt>";
|
|
}
|
|
return $text . "\n";
|
|
}
|
|
protected function _processDefListItems_callback_dd($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>" . $def . "</dd>\n";
|
|
}
|
|
|
|
|
|
protected function doFencedCodeBlocks($text) {
|
|
#
|
|
# Adding the fenced code block syntax to regular Markdown:
|
|
#
|
|
# ~~~
|
|
# Code block
|
|
# ~~~
|
|
#
|
|
$less_than_tab = $this->tab_width;
|
|
|
|
$text = preg_replace_callback('{
|
|
(?:\n|\A)
|
|
# 1: Opening marker
|
|
(
|
|
(?:~{3,}|`{3,}) # 3 or more tildes/backticks.
|
|
)
|
|
[ ]*
|
|
(?:
|
|
\.?([-_:a-zA-Z0-9]+) # 2: standalone class name
|
|
)?
|
|
[ ]*
|
|
(?:
|
|
'.$this->id_class_attr_catch_re.' # 3: Extra attributes
|
|
)?
|
|
[ ]* \n # Whitespace and newline following marker.
|
|
|
|
# 4: Content
|
|
(
|
|
(?>
|
|
(?!\1 [ ]* \n) # Not a closing marker.
|
|
.*\n+
|
|
)+
|
|
)
|
|
|
|
# Closing marker.
|
|
\1 [ ]* (?= \n )
|
|
}xm',
|
|
array($this, '_doFencedCodeBlocks_callback'), $text);
|
|
|
|
return $text;
|
|
}
|
|
protected function _doFencedCodeBlocks_callback($matches) {
|
|
$classname =& $matches[2];
|
|
$attrs =& $matches[3];
|
|
$codeblock = $matches[4];
|
|
|
|
if ($this->code_block_content_func) {
|
|
$codeblock = call_user_func($this->code_block_content_func, $codeblock, $classname);
|
|
} else {
|
|
$codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES);
|
|
}
|
|
|
|
$codeblock = preg_replace_callback('/^\n+/',
|
|
array($this, '_doFencedCodeBlocks_newlines'), $codeblock);
|
|
|
|
$classes = array();
|
|
if ($classname != "") {
|
|
if ($classname{0} == '.')
|
|
$classname = substr($classname, 1);
|
|
$classes[] = $this->code_class_prefix.$classname;
|
|
}
|
|
$attr_str = $this->doExtraAttributes($this->code_attr_on_pre ? "pre" : "code", $attrs, null, $classes);
|
|
$pre_attr_str = $this->code_attr_on_pre ? $attr_str : '';
|
|
$code_attr_str = $this->code_attr_on_pre ? '' : $attr_str;
|
|
$codeblock = "<pre$pre_attr_str><code$code_attr_str>$codeblock</code></pre>";
|
|
|
|
return "\n\n".$this->hashBlock($codeblock)."\n\n";
|
|
}
|
|
protected 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.
|
|
#
|
|
protected $em_relist = array(
|
|
'' => '(?:(?<!\*)\*(?!\*)|(?<![a-zA-Z0-9_])_(?!_))(?![\.,:;]?\s)',
|
|
'*' => '(?<![\s*])\*(?!\*)',
|
|
'_' => '(?<![\s_])_(?![a-zA-Z0-9_])',
|
|
);
|
|
protected $strong_relist = array(
|
|
'' => '(?:(?<!\*)\*\*(?!\*)|(?<![a-zA-Z0-9_])__(?!_))(?![\.,:;]?\s)',
|
|
'**' => '(?<![\s*])\*\*(?!\*)',
|
|
'__' => '(?<![\s_])__(?![a-zA-Z0-9_])',
|
|
);
|
|
protected $em_strong_relist = array(
|
|
'' => '(?:(?<!\*)\*\*\*(?!\*)|(?<![a-zA-Z0-9_])___(?!_))(?![\.,:;]?\s)',
|
|
'***' => '(?<![\s*])\*\*\*(?!\*)',
|
|
'___' => '(?<![\s_])___(?![a-zA-Z0-9_])',
|
|
);
|
|
|
|
|
|
protected function formParagraphs($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 $text;
|
|
}
|
|
|
|
|
|
### Footnotes
|
|
|
|
protected function stripFootnotes($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 or link definition marker.
|
|
(?!\n+[ ]{0,3}\S)# ensure line is not blank and followed
|
|
# by non-indented content
|
|
)*
|
|
)
|
|
}xm',
|
|
array($this, '_stripFootnotes_callback'),
|
|
$text);
|
|
return $text;
|
|
}
|
|
protected function _stripFootnotes_callback($matches) {
|
|
$note_id = $this->fn_id_prefix . $matches[1];
|
|
$this->footnotes[$note_id] = $this->outdent($matches[2]);
|
|
return ''; # String that will replace the block
|
|
}
|
|
|
|
|
|
protected 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 $text;
|
|
}
|
|
|
|
|
|
protected function appendFootnotes($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";
|
|
|
|
$attr = "";
|
|
if ($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\"";
|
|
}
|
|
$backlink_text = $this->fn_backlink_html;
|
|
$num = 0;
|
|
|
|
while (!empty($this->footnotes_ordered)) {
|
|
$footnote = reset($this->footnotes_ordered);
|
|
$note_id = key($this->footnotes_ordered);
|
|
unset($this->footnotes_ordered[$note_id]);
|
|
$ref_count = $this->footnotes_ref_count[$note_id];
|
|
unset($this->footnotes_ref_count[$note_id]);
|
|
unset($this->footnotes[$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);
|
|
|
|
# Prepare backlink, multiple backlinks if multiple references
|
|
$backlink = "<a href=\"#fnref:$note_id\"$attr>$backlink_text</a>";
|
|
for ($ref_num = 2; $ref_num <= $ref_count; ++$ref_num) {
|
|
$backlink .= " <a href=\"#fnref$ref_num:$note_id\"$attr>$backlink_text</a>";
|
|
}
|
|
# Add backlink to last paragraph; create new paragraph if needed.
|
|
if (preg_match('{</p>$}', $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 $text;
|
|
}
|
|
protected function _appendFootnotes_callback($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])) {
|
|
$num =& $this->footnotes_numbers[$node_id];
|
|
if (!isset($num)) {
|
|
# Transfer footnote content to the ordered list and give it its
|
|
# number
|
|
$this->footnotes_ordered[$node_id] = $this->footnotes[$node_id];
|
|
$this->footnotes_ref_count[$node_id] = 1;
|
|
$num = $this->footnote_counter++;
|
|
$ref_count_mark = '';
|
|
} else {
|
|
$ref_count_mark = $this->footnotes_ref_count[$node_id] += 1;
|
|
}
|
|
|
|
$attr = "";
|
|
if ($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$ref_count_mark:$node_id\">".
|
|
"<a href=\"#fn:$node_id\"$attr>$num</a>".
|
|
"</sup>";
|
|
}
|
|
|
|
return "[^".$matches[1]."]";
|
|
}
|
|
|
|
|
|
### Abbreviations ###
|
|
|
|
protected 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 $text;
|
|
}
|
|
protected function _stripAbbreviations_callback($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($abbr_desc);
|
|
return ''; # String that will replace the block
|
|
}
|
|
|
|
|
|
protected function doAbbreviations($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 $text;
|
|
}
|
|
protected function _doAbbreviations_callback($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];
|
|
}
|
|
}
|
|
}
|