public void It_Should_Dereference_An_Array_Element()
{
// Arrange
IList<IExpressionConstant> objlist = new List<IExpressionConstant>
{
new StringValue("a string"),
NumericValue.Create(123),
NumericValue.Create(456m),
new BooleanValue(false)
};
ArrayValue arrayValue = new ArrayValue(objlist);
// Assert
var valueAt = arrayValue.ValueAt(0);
Assert.That(valueAt.Value, Is.EqualTo(objlist[0].Value));
}
private LiquidExpressionResult DoLookup(ITemplateContext ctx, ArrayValue arrayValue, IExpressionConstant indexProperty)
{
String propertyNameString = ValueCaster.RenderAsString(indexProperty);
int index;
if (propertyNameString.ToLower().Equals("first"))
{
index = 0;
}
else if (propertyNameString.ToLower().Equals("last"))
{
index = arrayValue.ArrValue.Count - 1;
}
else if (propertyNameString.ToLower().Equals("size"))
{
return LiquidExpressionResult.Success(NumericValue.Create(arrayValue.ArrValue.Count));
}
else
{
var maybeIndexResult = ValueCaster.Cast<IExpressionConstant, NumericValue>(indexProperty);
if (maybeIndexResult.IsError || !maybeIndexResult.SuccessResult.HasValue)
{
return LiquidExpressionResult.Error("invalid array index: " + propertyNameString);
}
else
{
index = maybeIndexResult.SuccessValue<NumericValue>().IntValue;
}
}
if (arrayValue.ArrValue.Count == 0)
{
//return LiquidExpressionResult.Error("array is empty: " + propertyNameString);
return LiquidExpressionResult.Success(new None<IExpressionConstant>()); // not an error in Ruby liquid.
}
var result = arrayValue.ValueAt(index);
return LiquidExpressionResult.Success(result);
}