public override Expression VisitEqualityExpression([NotNull] RuleEngineParser.EqualityExpressionContext context)
{
var leftExpression = VisitRelationalExpression(context.relationalExpression(0));
for (int i = 1; i < context.ChildCount; i += 2)
{
var operatorSign = context.GetChild(i).GetText();
var rightExpression = VisitRelationalExpression((RuleEngineParser.RelationalExpressionContext)context.GetChild(i + 1));
ExpressionType expressionType;
switch (operatorSign)
{
case "==":
expressionType = ExpressionType.Equal;
break;
case "!=":
expressionType = ExpressionType.NotEqual;
break;
default:
throw new NotSupportedException($"Not support operator '{operatorSign}'.");
}
(leftExpression, rightExpression) = Convert(leftExpression, rightExpression);
leftExpression = Expression.MakeBinary(expressionType, leftExpression, rightExpression);
}
return(leftExpression);
}
/// <summary>
/// Visit a parse tree produced by <see cref="RuleEngineParser.equalityExpression"/>.
/// <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 VisitEqualityExpression([NotNull] RuleEngineParser.EqualityExpressionContext context)
{
return(VisitChildren(context));
}
