/**
* @param {string}  tagName     Name of the tag used by this pass
* @param {string}  syntaxChar  Relevant character used by this syntax
* @param {!RegExp} shortRegexp Regexp used for the short form syntax
* @param {!RegExp} longRegexp  Regexp used for the long form syntax
*/
function parseAbstractScript(tagName, syntaxChar, shortRegexp, longRegexp)
{
var pos = text.indexOf(syntaxChar);
if (pos === -1)
{
return;
}

parseShortForm(pos);
parseLongForm(pos);

/**
* Parse the long form x^(x)
*
* This syntax is supported by RDiscount
*
* @param {number} pos Position of the first relevant character
*/
function parseLongForm(pos)
{
pos = text.indexOf(syntaxChar + '(', pos);
if (pos === -1)
{
return;
}

var m, regexp = longRegexp;
regexp.lastIndex = pos;
while (m = regexp.exec(text))
{
var match    = m[0],
matchPos = m.index,
matchLen = match.length;

addTagPair(tagName, matchPos, 2, matchPos + matchLen - 1, 1);
overwrite(matchPos, matchLen);
}
if (match)
{
parseLongForm(pos);
}
}

/**
* Parse the short form x^x and x^x^
*
* This syntax is supported by most implementations that support superscript
*
* @param {number} pos Position of the first relevant character
*/
function parseShortForm(pos)
{
var m, regexp = shortRegexp;
regexp.lastIndex = pos;
while (m = regexp.exec(text))
{
var match    = m[0],
matchPos = m.index,
matchLen = match.length,
startPos = matchPos,
endLen   = (match.charAt(matchLen - 1) === syntaxChar) ? 1 : 0,
endPos   = matchPos + matchLen - endLen;

addTagPair(tagName, startPos, 1, endPos, endLen);
}
}
}