Method ReadNextToken

libraries/muparser/src/muParserTokenReader.cpp:263–346

\brief Read the next token from the string. */

	/** \brief Read the next token from the string. */
	ParserTokenReader::token_type ParserTokenReader::ReadNextToken()
	{
		MUP_ASSERT(m_pParser != nullptr);

		const char_type* szExpr = m_strFormula.c_str();
		token_type tok;

		// Ignore all non printable characters when reading the expression
		while (szExpr[m_iPos] > 0 && szExpr[m_iPos] <= 0x20)
		{
			// 14-31 are control characters. I don�t want to have to deal with such strings at all!
			// (see https://en.cppreference.com/w/cpp/string/byte/isprint)
			if (szExpr[m_iPos] >= 14 && szExpr[m_iPos] <= 31)
				Error(ecINVALID_CHARACTERS_FOUND, m_iPos);

			++m_iPos;
		}

		// Check for end of formula
		if (IsEOF(tok))
			return SaveBeforeReturn(tok);

		// Check for user defined binary operator
		if (IsOprt(tok))
			return SaveBeforeReturn(tok);

		// Check for function token
		if (IsFunTok(tok))
			return SaveBeforeReturn(tok);

		// Check built in operators / tokens
		if (IsBuiltIn(tok))
			return SaveBeforeReturn(tok);

		// Check for function argument separators
		if (IsArgSep(tok))
			return SaveBeforeReturn(tok);

		// Check for values / constant tokens
		if (IsValTok(tok))
			return SaveBeforeReturn(tok);

		// Check for variable tokens
		if (IsVarTok(tok))
			return SaveBeforeReturn(tok);

		// Check for string variables
		if (IsStrVarTok(tok))
			return SaveBeforeReturn(tok);

		// Check for String tokens
		if (IsString(tok))
			return SaveBeforeReturn(tok);

		// Check for unary operators
		if (IsInfixOpTok(tok))
			return SaveBeforeReturn(tok);