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This change allows to use the ! exclamation mark to produce Roman Numeral style Ordered Lists. Placing a ! in the first character position of any line, with a space immediately after it, will produce i, ii, iii, iv and so forth instead of 1, 2, 3, 4, and so forth.

includes/Parser.php

Line 2002
Added:
else if ('!' == $char ) { $result .= '<ol class=roman><li>'; }

Line 2015
From:
if ( '*' == $char || '#' == $char ) { return '</li><li>'; }

To:
if ( '*' == $char || '#' == $char || '!' == $char) { return '</li><li>'; }

Line 2032
From:
else if ( '#' == $char ) { $text = '</li></ol>'; }

To:
else if ( '#' == $char || '!' == $char) { $text = '</li></ol>'; }

Line 2076
From:
$prefixLength = strspn( $oLine, '*#:;' );

To:
$prefixLength = strspn( $oLine, '*#:;!' );


In the CSS sheet being used, add the following line:

ol.roman { list-style-type: upper-roman; }