// More type safe than base class's ParseJson
// Parse json.
// [1,2,3] is a single column table, actually equivalent to:
// [{Value : 1, Value: 2, Value :3 }]
internal static TableValue TableFromJsonArray(JsonElement array)
{
Contract.Assert(array.ValueKind == JsonValueKind.Array);
List <RecordValue> records = new List <RecordValue>();
for (var i = 0; i < array.GetArrayLength(); ++i)
{
var element = array[i];
var val = GuaranteeRecord(FormulaValue.FromJson(element));
records.Add(val);
}
// Constructor will handle both single-column table
TableType type;
if (records.Count == 0)
{
type = new TableType();
}
else
{
type = TableType.FromRecord((RecordType)GuaranteeRecord(records[0]).IRContext.ResultType);
}
return(new InMemoryTableValue(IRContext.NotInSource(type), records.Select(r => DValue <RecordValue> .Of(r))));
}
// Used for converting an arbitrary .net enumerable.
// The types of the elements my be heterogenous even after this call
private static IEnumerable <RecordValue> TableToRecords(
System.Collections.IEnumerable values,
Type elementType)
{
foreach (var obj in values)
{
var formulaValue = GuaranteeRecord(FormulaValue.New(obj, elementType));
yield return(formulaValue);
}
}
private FormulaValue PropagateFieldType(FormulaValue fieldValue, FormulaType fieldType)
{
if (fieldValue is RecordValue recordValue)
{
return(new InMemoryRecordValue(IRContext.NotInSource(fieldType), recordValue.Fields));
}
if (fieldValue is TableValue tableValue)
{
return(new InMemoryTableValue(IRContext.NotInSource(fieldType), tableValue.Rows));
}
return(fieldValue);
}
private static RecordValue GuaranteeRecord(FormulaValue rawVal)
{
if (rawVal is RecordValue record)
{
return(record);
}
// Handle the single-column-table case.
var defaultField = new NamedValue("Value", rawVal);
RecordValue val = RecordFromFields(defaultField);
return(val);
}
public static TableValue TableFromRecords <T>(IEnumerable <T> values, TableType type)
{
var values2 = values.Select(v => GuaranteeRecord(FormulaValue.New(v, typeof(T))));
return(new InMemoryTableValue(IRContext.NotInSource(type), values2.Select(r => DValue <RecordValue> .Of(r))));
}
public NamedValue(string name, FormulaValue value)
{
Name = name ?? throw new ArgumentNullException(nameof(name));
Value = value;
}
