showdown/src/subParsers/hashHTMLBlocks.js

/**
 * Created by Estevao on 11-01-2015.
 */

showdown.subParser('hashHTMLBlocks', function (text, options, globals) {
    'use strict';

    // attacklab: Double up blank lines to reduce lookaround
    text = text.replace(/\n/g, '\n\n');

    // Hashify HTML blocks:
    // 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:
    //var block_tags_a = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del|style|section|header|footer|nav|article|aside';
    //var block_tags_b = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|style|section|header|footer|nav|article|aside';

    // First, look for nested blocks, e.g.:
    //   <div>
    //     <div>
    //     tags for inner block must be indented.
    //     </div>
    //   </div>
    //
    // The outermost tags must start at the left margin for this to match, and
    // the inner nested divs must be indented.
    // We need to do this before the next, more liberal match, because the next
    // match will start at the first `<div>` and stop at the first `</div>`.

    // attacklab: This regex can be expensive when it fails.
    /*
     var text = text.replace(/
     (						// save in $1
     ^					// start of line  (with /m)
     <($block_tags_a)	// start tag = $2
     \b					// word break
     // attacklab: hack around khtml/pcre bug...
     [^\r]*?\n			// any number of lines, minimally matching
     </\2>				// the matching end tag
     [ \t]*				// trailing spaces/tabs
     (?=\n+)				// followed by a newline
     )						// attacklab: there are sentinel newlines at end of document
     /gm,function(){...}};
     */
    text = text.replace(/^(<(p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del)\b[^\r]*?\n<\/\2>[ \t]*(?=\n+))/gm, showdown.subParser('hashElement')(text, options, globals));

    //
    // Now match more liberally, simply from `\n<tag>` to `</tag>\n`
    //

    /*
     var text = text.replace(/
     (						// save in $1
     ^					// start of line  (with /m)
     <($block_tags_b)	// start tag = $2
     \b					// word break
     // attacklab: hack around khtml/pcre bug...
     [^\r]*?				// any number of lines, minimally matching
     </\2>				// the matching end tag
     [ \t]*				// trailing spaces/tabs
     (?=\n+)				// followed by a newline
     )						// attacklab: there are sentinel newlines at end of document
     /gm,function(){...}};
     */
    text = text.replace(/^(<(p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|style|section|header|footer|nav|article|aside)\b[^\r]*?<\/\2>[ \t]*(?=\n+)\n)/gm, showdown.subParser('hashElement')(text, options, globals));

    // Special case just for <hr />. It was easier to make a special case than
    // to make the other regex more complicated.

    /*
     text = text.replace(/
     (						// save in $1
     \n\n				// Starting after a blank line
     [ ]{0,3}
     (<(hr)				// start tag = $2
     \b					// word break
     ([^<>])*?			//
     \/?>)				// the matching end tag
     [ \t]*
     (?=\n{2,})			// followed by a blank line
     )
     /g,showdown.subParser('hashElement')(text, options, globals));
     */
    text = text.replace(/(\n[ ]{0,3}(<(hr)\b([^<>])*?\/?>)[ \t]*(?=\n{2,}))/g, showdown.subParser('hashElement')(text, options, globals));

    // Special case for standalone HTML comments:

    /*
     text = text.replace(/
     (						// save in $1
     \n\n				// Starting after a blank line
     [ ]{0,3}			// attacklab: g_tab_width - 1
     <!
     (--[^\r]*?--\s*)+
     >
     [ \t]*
     (?=\n{2,})			// followed by a blank line
     )
     /g,showdown.subParser('hashElement')(text, options, globals));
     */
    text = text.replace(/(\n\n[ ]{0,3}<!(--[^\r]*?--\s*)+>[ \t]*(?=\n{2,}))/g, showdown.subParser('hashElement')(text, options, globals));

    // PHP and ASP-style processor instructions (<?...?> and <%...%>)

    /*
     text = text.replace(/
     (?:
     \n\n				// Starting after a blank line
     )
     (						// save in $1
     [ ]{0,3}			// attacklab: g_tab_width - 1
     (?:
     <([?%])			// $2
     [^\r]*?
     \2>
     )
     [ \t]*
     (?=\n{2,})			// followed by a blank line
     )
     /g,showdown.subParser('hashElement')(text, options, globals));
     */
    text = text.replace(/(?:\n\n)([ ]{0,3}(?:<([?%])[^\r]*?\2>)[ \t]*(?=\n{2,}))/g, showdown.subParser('hashElement')(text, options, globals));

    // attacklab: Undo double lines (see comment at top of this function)
    text = text.replace(/\n\n/g, '\n');
    return text;


});