/// <summary>
/// Visit a parse tree produced by the <c>comparatorExpression</c>
/// labeled alternative in <see cref="AntlrConditionParser.expression"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitComparatorExpression([NotNull] AntlrConditionParser.ComparatorExpressionContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by the <c>comparatorExpression</c>
/// labeled alternative in <see cref="AntlrConditionParser.expression"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitComparatorExpression([NotNull] AntlrConditionParser.ComparatorExpressionContext context)
{
}
public override Result VisitComparatorExpression(AntlrConditionParser.ComparatorExpressionContext context)
{
var left = Visit(context.left);
var right = Visit(context.right);
if (left.Type != right.Type)
{
throw new Exception("Invalid type comparison");
}
if (context.op.EQ() != null)
{
return new Result {
Bool = left.Equals(right)
}
}
;
if (context.op.NEQ() != null)
{
return new Result {
Bool = !left.Equals(right)
}
}
;
if (context.op.GT() != null)
{
if (left.Type != right.Type || left.Type == ResultType.Object || left.Type == ResultType.Bool)
{
throw new Exception("Invalid type comparison");
}
if (left.Type == ResultType.Decimal)
{
return new Result {
Bool = left.Decimal > right.Decimal
}
}
;
if (left.Type == ResultType.String)
{
return new Result {
Bool = string.Compare(left.String, right.String, StringComparison.Ordinal) > 0
}
}
;
}
if (context.op.GE() != null)
{
if (left.Type != right.Type || left.Type == ResultType.Object || left.Type == ResultType.Bool)
{
throw new Exception("Invalid type comparison");
}
if (left.Type == ResultType.Decimal)
{
return new Result {
Bool = left.Decimal > right.Decimal
}
}
;
if (left.Type == ResultType.String)
{
return new Result {
Bool = string.Compare(left.String, right.String, StringComparison.Ordinal) >= 0
}
}
;
}
if (context.op.LT() != null)
{
if (left.Type != right.Type || left.Type == ResultType.Object || left.Type == ResultType.Bool)
{
throw new Exception("Invalid type comparison");
}
if (left.Type == ResultType.Decimal)
{
return new Result {
Bool = left.Decimal > right.Decimal
}
}
;
if (left.Type == ResultType.String)
{
return new Result {
Bool = string.Compare(left.String, right.String, StringComparison.Ordinal) < 0
}
}
;
}
if (context.op.LE() != null)
{
if (left.Type != right.Type || left.Type == ResultType.Object || left.Type == ResultType.Bool)
{
throw new Exception("Invalid type comparison");
}
if (left.Type == ResultType.Decimal)
{
return new Result {
Bool = left.Decimal > right.Decimal
}
}
;
if (left.Type == ResultType.String)
{
return new Result {
Bool = string.Compare(left.String, right.String, StringComparison.Ordinal) <= 0
}
}
;
}
return(new Result());
}
