Method IsBuiltIn

ibtk/contrib/muparser/src/muParserTokenReader.cpp:418–514

\brief Check if a built in operator or other token can be found \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::IsBuiltIn(token_type& a_Tok)
	{
		const char_type** const pOprtDef = m_pParser->GetOprtDef(),
			* const szFormula = m_strFormula.c_str();

		// Compare token with function and operator strings
		// check string for operator/function
		for (int i = 0; pOprtDef[i]; i++)
		{
			std::size_t len(std::char_traits<char_type>::length(pOprtDef[i]));
			if (string_type(pOprtDef[i]) == string_type(szFormula + m_iPos, szFormula + m_iPos + len))
			{
				switch (i)
				{
				case cmLAND:
				case cmLOR:
				case cmLT:
				case cmGT:
				case cmLE:
				case cmGE:
				case cmNEQ:
				case cmEQ:
				case cmADD:
				case cmSUB:
				case cmMUL:
				case cmDIV:
				case cmPOW:
				case cmASSIGN:
					// The assignment operator need special treatment
					if (i == cmASSIGN && m_iSynFlags & noASSIGN)
						Error(ecUNEXPECTED_OPERATOR, m_iPos, pOprtDef[i]);

					if (!m_pParser->HasBuiltInOprt()) continue;
					if (m_iSynFlags & noOPT)
					{
						// Maybe its an infix operator not an operator
						// Both operator types can share characters in 
						// their identifiers
						if (IsInfixOpTok(a_Tok))
							return true;

						Error(ecUNEXPECTED_OPERATOR, m_iPos, pOprtDef[i]);
					}

					m_iSynFlags = noBC | noOPT | noARG_SEP | noPOSTOP | noASSIGN | noIF | noELSE | noEND;
					break;

				case cmBO:
					if (m_iSynFlags & noBO)
						Error(ecUNEXPECTED_PARENS, m_iPos, pOprtDef[i]);

					if (m_lastTok.GetCode() == cmFUNC)
						m_iSynFlags = noOPT | noEND | noARG_SEP | noPOSTOP | noASSIGN | noIF | noELSE;
					else
						m_iSynFlags = noBC | noOPT | noEND | noARG_SEP | noPOSTOP | noASSIGN | noIF | noELSE;

					m_bracketStack.push(cmBO);
					break;