/// <summary>
/// Look up the index in the value. This works for dictionaries, arrays and strings.
/// </summary>
/// <param name="ctx"></param>
/// <param name="value"></param>
/// <param name="indexProperty"></param>
/// <returns></returns>
public LiquidExpressionResult Lookup(
ITemplateContext ctx,
IExpressionConstant value,
IExpressionConstant indexProperty)
{
//Console.WriteLine("LOOKUP=> VALUE: " + value);
//Console.WriteLine(" => INDEX: " + indexProperty);
if (value == null)
{
return LiquidExpressionResult.Error("ERROR : cannot apply an index to a nil value.");
}
//return DoLookup(ctx, (dynamic) value, indexProperty);
var arr = value as ArrayValue;
if (arr != null)
{
return DoLookup(ctx, arr, indexProperty);
}
var dict = value as DictionaryValue;
if (dict != null)
{
return DoLookup(ctx, dict, indexProperty);
}
var str = value as StringValue;
if (str != null)
{
return DoLookup(ctx, str, indexProperty);
}
return LiquidExpressionResult.Error("ERROR : cannot apply an index to a " + value.LiquidTypeName + ".");
}
public static StringValue Eval(IExpressionConstant liquidExpression, Func<String, String> f)
{
String before = ValueCaster.RenderAsString(liquidExpression);
if (String.IsNullOrWhiteSpace(before))
{
return new StringValue("");
}
return new StringValue(f(before));
}
private static Func<Option<IExpressionConstant>, bool> IsEqual(IExpressionConstant expressionConstant)
{
return x =>
{
if (x.HasValue)
{
return x.Value.Value.Equals(expressionConstant.Value);
}
else
{
return expressionConstant == null;
}
};
}
public static Option<IExpressionConstant> TryField(IExpressionConstant expressionConstant, string stringVal)
{
var dict = expressionConstant as DictionaryValue;
if (dict == null)
{
return new None<IExpressionConstant>();
//return new Undefined(stringVal);
}
if (!dict.DictValue.ContainsKey(stringVal))
{
return new None<IExpressionConstant>();
}
else
{
return dict.DictValue[stringVal];
}
}
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);
}
public static bool IsBlank(IExpressionConstant val)
{
if (val == null)
{
return true; // regardless of what shopify liquid + activesupport do
}
//return CheckIsBlank((dynamic)val);
var str = val as StringValue;
if (str != null)
{
return CheckIsBlank(str);
}
var arr = val as ArrayValue;
if (arr != null)
{
return CheckIsBlank(arr);
}
var dict = val as DictionaryValue;
if (dict != null)
{
return CheckIsBlank(dict);
}
return CheckIsBlank(val);
}
public static bool IsEmpty(IExpressionConstant val)
{
if (val == null /* || val.IsNil */)
{
return false; // this appears to be the case in liquid?
}
//return CheckIsEmpty((dynamic)val);
var str = val as StringValue;
if (str != null)
{
return CheckIsEmpty(str);
}
var arr = val as ArrayValue;
if (arr != null)
{
return CheckIsEmpty(arr);
}
var dict = val as DictionaryValue;
if (dict != null)
{
return CheckIsEmpty(dict);
}
return CheckIsEmpty(val);
}
public String Render(IExpressionConstant result)
{
return ValueCaster.RenderAsString(result);
}
private LiquidExpressionResult Contains(DictionaryValue dictValue, IExpressionConstant expressionConstant)
{
return LiquidExpressionResult.Success(new BooleanValue(dictValue.DictValue.Keys.Any(x => x.Equals(expressionConstant.Value))));
}
private LiquidExpressionResult Contains(ArrayValue arrayValue, IExpressionConstant expressionConstant)
{
return LiquidExpressionResult.Success(new BooleanValue(arrayValue.ArrValue.Any(IsEqual(expressionConstant))));
}
private LiquidExpressionResult Contains(StringValue stringValue, IExpressionConstant expressionConstant)
{
String s = ValueCaster.RenderAsString(expressionConstant);
return LiquidExpressionResult.Success(stringValue.StringVal.Contains(s) ? new BooleanValue(true) : new BooleanValue(false));
}
private LiquidExpressionResult Contains(IExpressionConstant expr, IExpressionConstant expressionConstant)
{
//Console.WriteLine("ERROR");
return LiquidExpressionResult.Error("Unable to use 'contains' on this type.");
}
private LiquidExpressionResult DoLookup(ITemplateContext ctx, IExpressionConstant c, IExpressionConstant indexProperty)
{
return LiquidExpressionResult.Error("ERROR : cannot apply an index to a "+c.LiquidTypeName+".");
}
public static BooleanValue Compare(IExpressionConstant x, IExpressionConstant y,
Func<decimal, decimal, bool> func)
{
var numericValueResult1 = ValueCaster.Cast<IExpressionConstant, NumericValue>(x);
var numericValueResult2 = ValueCaster.Cast<IExpressionConstant, NumericValue>(y);
if (numericValueResult2.IsError || numericValueResult1.IsError)
{
return new BooleanValue(false);
}
var decimalValue1 = numericValueResult1.SuccessValue<NumericValue>().DecimalValue;
var decimalValue2 = numericValueResult2.SuccessValue<NumericValue>().DecimalValue;
return new BooleanValue(func(decimalValue1, decimalValue2));
}
private LiquidExpressionResult DoLookup(ITemplateContext ctx, DictionaryValue dictionaryValue, IExpressionConstant indexProperty)
{
String propertyNameString = ValueCaster.RenderAsString(indexProperty);
if (propertyNameString.ToLower().Equals("size"))
{
return LiquidExpressionResult.Success(NumericValue.Create(dictionaryValue.DictValue.Keys.Count()));
}
return LiquidExpressionResult.Success(dictionaryValue.ValueAt(indexProperty.Value.ToString()));
}
private static bool CheckIsBlank(IExpressionConstant _)
{
return false; // the only conditions will have been caught by IsBlank -- other types are never blank
}
// TODO: this is inefficient and ugly and duplicates much of ArrayValue
private LiquidExpressionResult DoLookup(ITemplateContext ctx, StringValue strValue, IExpressionConstant indexProperty)
{
var strValues = strValue.StringVal.ToCharArray().Select(ch => new StringValue(ch.ToString()).ToOption()).ToList();
String propertyNameString = ValueCaster.RenderAsString(indexProperty);
int index;
if (propertyNameString.ToLower().Equals("first"))
{
index = 0;
}
else if (propertyNameString.ToLower().Equals("last"))
{
index = strValues.Count - 1;
}
else if (propertyNameString.ToLower().Equals("size"))
{
return LiquidExpressionResult.Success(NumericValue.Create(strValues.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 (strValues.Count == 0)
{
//return LiquidExpressionResult.Error("Empty string: " + propertyNameString);
return LiquidExpressionResult.Success(new None<IExpressionConstant>()); // not an error in Ruby liquid.
}
return LiquidExpressionResult.Success(ArrayIndexer.ValueAt(strValues, index));
}
private static bool CheckIsEmpty(IExpressionConstant _)
{
return false; // the only conditions will have been caught by IsEmpty
}
public void DefineGlobal(string key, IExpressionConstant obj)
{
_symbolTables[0].DefineLocalVariable(key, obj);
}
public void Define(string reference, IExpressionConstant obj)
{
//Console.WriteLine("Adding " + reference + " to current scope");
_symbolTables.Last().DefineLocalVariable(reference, obj);
}