public static IEnumerable <IFluentPathValue> Evaluate(this Evaluator evaluator, IFluentPathValue instance, IEvaluationContext context)
{
var original = FhirValueList.Create(instance);
context.OriginalContext = original;
return(evaluator(original, context));
}
public static IEnumerable <IFluentPathValue> IntegerEval(this IEnumerable <IFluentPathValue> focus)
{
if (focus.JustValues().Count() == 1)
{
var val = focus.Single().Value;
if (val != null)
{
if (val is long)
{
return(FhirValueList.Create((long)val));
}
//if (val is decimal) return (Int64)Math.Round((decimal)val);
if (val is string)
{
long result;
if (Int64.TryParse((string)val, out result))
{
return(FhirValueList.Create(result));
}
}
}
}
return(FhirValueList.Empty());
}
public static IEnumerable <IFluentPathValue> Create(params object[] values)
{
if (values != null)
{
return(values.Select(value => value == null ? null : value is IFluentPathValue ? (IFluentPathValue)value : new TypedValue(value)));
}
else
{
return(FhirValueList.Empty());
}
}
public static IEnumerable <IFluentPathValue> IsEquivalentTo(this IEnumerable <IFluentPathValue> left, IEnumerable <IFluentPathValue> right)
{
if (!left.Any() && !right.Any())
{
return(FhirValueList.Create(true));
}
if (left.Count() != right.Count())
{
return(FhirValueList.Create(false));
}
return(FhirValueList.Create(left.All((IFluentPathValue l) => right.Any(r => l.IsEquivalentTo(r)))));
}
public static IEnumerable <IFluentPathValue> IsEqualTo(this IEnumerable <IFluentPathValue> left, IEnumerable <IFluentPathValue> right)
{
if (!left.Any() && !right.Any())
{
return(FhirValueList.Create(true));
}
if (left.Count() != right.Count())
{
return(FhirValueList.Create(false));
}
return(FhirValueList.Create(left.Zip(right, (l, r) => l.IsEqualTo(r)).All(x => x)));
}
public static Evaluator Any(Evaluator condition)
{
return((f, c) =>
{
if (condition != null)
{
return f.Any(elements => condition(elements, c));
}
else
{
return FhirValueList.Create(f.Any());
}
});
}
public static Evaluator Axis(Axis axis)
{
return((focus, ctx) =>
{
switch (axis)
{
case FluentPath.Axis.Descendants:
return focus.JustElements().Descendants();
case FluentPath.Axis.Parent:
return focus.JustElements().Parents();
case FluentPath.Axis.Focus:
return focus;
case FluentPath.Axis.Children:
return focus.JustElements().Children();
case FluentPath.Axis.Context:
if (ctx.OriginalContext == null)
{
throw new InvalidOperationException("Cannot resolve the $context, the Evaluator did not provide it at runtime");
}
else
{
return ctx.OriginalContext;
}
case FluentPath.Axis.Resource:
if (ctx.OriginalResource == null)
{
throw new InvalidOperationException("Cannot resolve the $resource, the evaluation context has no information about it.");
}
else
{
return FhirValueList.Create(ctx.OriginalResource);
}
default:
throw new InvalidOperationException("Internal error: unknown axis '{0}'".FormatWith(axis));
}
});
}
public static IEnumerable <IFluentPathValue> Substring(this IEnumerable <IFluentPathValue> focus, long start, long?length)
{
if (focus.Count() == 1)
{
if (focus.First().Value != null)
{
var str = focus.First().AsStringRepresentation();
if (length.HasValue)
{
return(FhirValueList.Create(str.Substring((int)start, (int)length.Value)));
}
else
{
return(FhirValueList.Create(str.Substring((int)start)));
}
}
}
return(FhirValueList.Empty());
}
public static IEnumerable <IFluentPathValue> IsEmpty(this IEnumerable <IFluentPathValue> focus)
{
return(FhirValueList.Create(!focus.Any()));
}
public static IEnumerable <IFluentPathValue> IsEqualTo(this IEnumerable <IFluentPathValue> left, object value)
{
var result = left.SingleOrDefault(v => Object.Equals(v.Value, value)) != null;
return(FhirValueList.Create(result));
}
//public static IEnumerable<IFluentPathElement> Resolve(this IEnumerable<IFluentPathValue> focus, FhirClient client)
//{
// return focus.Resolve(new BaseEvaluationContext(client));
//}
//public static IEnumerable<IFluentPathElement> Resolve(this IEnumerable<IFluentPathValue> focus, IEvaluationContext context)
//{
// foreach (var item in focus)
// {
// string url = null;
// // Something that looks like a Reference
// if (item is IFluentPathElement)
// {
// var maybeReference = ((IFluentPathElement)item).Children("reference").SingleOrDefault();
// if (maybeReference != null && maybeReference.Value != null && maybeReference.Value is string)
// url = maybeReference.AsString();
// }
// // A string as a direct url
// if (item.Value != null && item.Value is string)
// url = item.AsString();
// if(url != null)
// yield return context.ResolveResource(url);
// }
//}
public static IEnumerable <IFluentPathValue> MaxLength(this IEnumerable <IFluentPathValue> focus)
{
return(FhirValueList.Create(focus.JustValues()
.Aggregate(0, (val, item) => Math.Max(item.AsStringRepresentation().Length, val))));
}
public static IEnumerable <IFluentPathValue> CountItems(this IEnumerable <IFluentPathValue> focus)
{
return(FhirValueList.Create(focus.Count()));
}
public static IEnumerable <IFluentPathValue> Select(this IEnumerable <IFluentPathValue> focus,
Func <IEnumerable <IFluentPathValue>, IEnumerable <IFluentPathValue> > mapper)
{
return(focus.SelectMany(v => mapper(FhirValueList.Create(v))));
}
public static IEnumerable <IFluentPathValue> All(this IEnumerable <IFluentPathValue> focus,
Func <IEnumerable <IFluentPathValue>, IEnumerable <IFluentPathValue> > condition)
{
return(FhirValueList.Create(focus.All(v => condition(FhirValueList.Create(v)).booleanEval())));
}
public static IEnumerable <IFluentPathValue> Evaluate(this Evaluator evaluator, IFluentPathValue instance)
{
var original = FhirValueList.Create(instance);
return(evaluator.Evaluate(instance, new BaseEvaluationContext()));
}
public static IEnumerable <IFluentPathValue> Not(this IEnumerable <IFluentPathValue> focus)
{
return(FhirValueList.Create(!focus.booleanEval()));
}
public static IEnumerable <IFluentPathValue> Or(this IEnumerable <IFluentPathValue> left, IEnumerable <IFluentPathValue> right)
{
return(FhirValueList.Create(left.booleanEval() || right.booleanEval()));
}
public static IEnumerable <IFluentPathValue> Evaluate(string expression, IFluentPathValue instance)
{
var evaluator = Compile(expression);
return(evaluator(FhirValueList.Create(instance), new BaseEvaluationContext()));
}
