Method IsPostOpTok

ibtk/contrib/muparser/src/muParserTokenReader.cpp:709–751

\brief Check if a string position contains a unary post value operator. */

	/** \brief Check if a string position contains a unary post value operator. */
	bool ParserTokenReader::IsPostOpTok(token_type& a_Tok)
	{
		// <ibg 20110629> Do not check for postfix operators if they are not allowed at
		//                the current expression index.
		//
		//  This will fix the bug reported here:  
		//
		//  http://sourceforge.net/tracker/index.php?func=detail&aid=3343891&group_id=137191&atid=737979
		//
		if (m_iSynFlags & noPOSTOP)
			return false;
		// </ibg>

		// Tricky problem with equations like "3m+5":
		//     m is a postfix operator, + is a valid sign for postfix operators and 
		//     for binary operators parser detects "m+" as operator string and 
		//     finds no matching postfix operator.
		// 
		// This is a special case so this routine slightly differs from the other
		// token readers.

		// Test if there could be a postfix operator
		string_type sTok;
		auto iEnd = ExtractToken(m_pParser->ValidOprtChars(), sTok, (std::size_t)m_iPos);
		if (iEnd == m_iPos)
			return false;

		// iterate over all postfix operator strings
		funmap_type::const_reverse_iterator it = m_pPostOprtDef->rbegin();
		for (; it != m_pPostOprtDef->rend(); ++it)
		{
			if (sTok.find(it->first) != 0)
				continue;

			a_Tok.Set(it->second, sTok);
			m_iPos += (int)it->first.length();

			m_iSynFlags = noVAL | noVAR | noFUN | noBO | noPOSTOP | noSTR | noASSIGN;
			return true;
		}

		return false;
	}


	/** \brief Check whether the token at a given position is a value token.