Method IsOprt

ibtk/contrib/muparser/src/muParserTokenReader.cpp:649–705

\brief Check if a string position contains a binary operator. \param a_Tok [out] Operator token if one is found. This can either be a binary operator or an infix operator token. \return true if an operator token has been found. */

		\return true if an operator token has been found.
	*/
	bool ParserTokenReader::IsOprt(token_type& a_Tok)
	{
		const char_type* const szExpr = m_strFormula.c_str();
		string_type strTok;

		auto iEnd = ExtractOperatorToken(strTok, (std::size_t)m_iPos);
		if (iEnd == m_iPos)
			return false;

		// Check if the operator is a built in operator, if so ignore it here
		const char_type** const pOprtDef = m_pParser->GetOprtDef();
		for (int i = 0; m_pParser->HasBuiltInOprt() && pOprtDef[i]; ++i)
		{
			if (string_type(pOprtDef[i]) == strTok)
				return false;
		}

		// Note:
		// All tokens in oprt_bin_maptype are have been sorted by their length
		// Long operators must come first! Otherwise short names (like: "add") that
		// are part of long token names (like: "add123") will be found instead 
		// of the long ones.
		// Length sorting is done with ascending length so we use a reverse iterator here.
		funmap_type::const_reverse_iterator it = m_pOprtDef->rbegin();
		for (; it != m_pOprtDef->rend(); ++it)
		{
			const string_type& sID = it->first;
			if (sID == string_type(szExpr + m_iPos, szExpr + m_iPos + sID.length()))
			{
				a_Tok.Set(it->second, strTok);

				// operator was found
				if (m_iSynFlags & noOPT)
				{
					// An operator was found but is not expected to occur at
					// this position of the formula, maybe it is an infix 
					// operator, not a binary operator. Both operator types
					// can share characters in their identifiers.
					if (IsInfixOpTok(a_Tok))
						return true;
					else
					{
						// nope, no infix operator
						return false;
						//Error(ecUNEXPECTED_OPERATOR, m_iPos, a_Tok.GetAsString()); 
					}

				}

				m_iPos += (int)sID.length();
				m_iSynFlags = noBC | noOPT | noARG_SEP | noPOSTOP | noEND | noASSIGN;
				return true;
			}
		}

		return false;
	}