public Either <ParsingError, CellValueCalculator> TryApplyBinaryOperator(
string operatorChars,
CellValueCalculator secondArgument,
FormulaParameters parameters)
{
if ((operatorChars == "&&" || operatorChars == "||") &&
(ResultType != typeof(bool) || secondArgument.ResultType != typeof(bool)))
{
return(Left(new ParsingError($"Operator '{operatorChars}' cannot be applied to operands of type '{ResultType.Name}' and '{secondArgument.ResultType}'")));
}
var op = KnownBinaryOperations[operatorChars];
var localThis = this;
return
(from resultType in TryToDeduceResultingType(operatorChars, ResultType, secondArgument.ResultType)
from leftOperand in localThis.TryCastTo(resultType)
from rightOperand in secondArgument.TryCastTo(resultType)
select CombineCalculators(
op.ResultIsBoolean?typeof(bool) : resultType,
parameters,
op.Expression(leftOperand.CalculateExpression, rightOperand.CalculateExpression),
$"{leftOperand.CalculateExpression}{operatorChars}{rightOperand.CalculateExpression}",
leftOperand,
rightOperand));
}
internal ColumnFormula(
CellValueCalculator cellValueCalculator,
FormulaExpressionsCompiler formulaExpressionsCompiler)
{
_cellCalculator = formulaExpressionsCompiler.CompileCellValueCalculator(cellValueCalculator);
_aggregatedValueCalculators = formulaExpressionsCompiler.CompileAggregatedValueCalculators(cellValueCalculator.AggregatedValuesCalculators);
_expressionText = cellValueCalculator.ToString();
}
public Delegate CompileCellValueCalculator(CellValueCalculator valueCalculator)
{
return(Expression.Lambda(valueCalculator.CalculateExpression, Parameters.CurrentRow, Parameters.AggregatedValues).Compile());
}