execute method

@override List execute(List results, Map<String, dynamic> passed)

The iterable, nested function that evaluates the entire FHIRPath expression one object at a time

Implementation

@override
List execute(List results, Map<String, dynamic> passed) {
  final finalTotal =
      IterationContext.withIterationContext((iterationContext) {
    List<dynamic> currentTotal = [];

    late FhirPathParser expression;
    late dynamic initialValue;
    if (value.value.first is CommaParser) {
      initialValue = (value.value.first as CommaParser)
          .after
          .execute(results.toList(), passed);
      expression = (value.value.first as CommaParser).before;
    } else {
      initialValue = [];
      expression = value;
    }

    iterationContext.totalValue = initialValue as List;
    results.forEachIndexed((i, r) {
      iterationContext.indexValue = i;
      iterationContext.thisValue = r;
      iterationContext.totalValue = expression.execute([r], passed);
      currentTotal = iterationContext.totalValue;
    });

    return currentTotal;
  }, passed);

  return finalTotal;
}