private static Value enterOperand(OperandAST operandAst)
{
return(operandAst.Type switch
{
OperandType.Delta => new DeltaValue(createValue(operandAst)),
OperandType.Prior => new PriorValue(createValue(operandAst)),
_ => createValue(operandAst),
});
private ConditionAST parseCompare()
{
var startIndex = _index;
OperandAST left = parseExpression();
if (left != null)
{
if (isConditionCompare(peekToken()))
{
ConditionCompare?compareOperator = parseCompareOperator();
if (compareOperator.HasValue)
{
startIndex = _index;
OperandAST right = parseExpression();
if (right != null)
{
return(new ConditionAST
{
Left = left,
Right = right,
CompareOperator = compareOperator.Value
});
}
else
{
throw new ParserException($"Invalid right operand at column {startIndex}");
}
}
else
{
throw new ParserException($"Invalid or inexistant comparison operator at column {_index}");
}
}
else
{
throw new ParserException($"Invalid or inexistant comparison operator at column {_index}");
}
}
else
{
throw new ParserException($"Invalid left operand at column {startIndex}");
}
}