//empty content
public static void Empty(IIonReader reader)
{
//also convieniently testing symtab
Assert.IsNotNull(reader.GetSymbolTable());
Assert.AreEqual(IonType.None, reader.MoveNext());
}
public static ISymbolTable ImportReaderTable(IIonReader reader, ICatalog catalog, bool isOnStruct)
{
var table = reader.GetSymbolTable() as ReaderLocalTable ?? new ReaderLocalTable(reader.GetSymbolTable());
var imports = table.Imports;
var symbols = table.OwnSymbols;
var newSymbols = new List <string>();
if (!isOnStruct)
{
reader.MoveNext();
}
Debug.Assert(
reader.CurrentType == IonType.Struct,
"Invalid symbol table image passed in reader " + reader.CurrentType + " encountered when a struct was expected.");
Debug.Assert(
SystemSymbols.IonSymbolTable.Equals(reader.GetTypeAnnotations()[0]),
"Local symbol tables must be annotated by " + SystemSymbols.IonSymbolTable + ".");
// Assume that we're standing before a struct.
reader.StepIn();
IonType fieldType;
bool foundImport = false;
bool foundLocals = false;
while ((fieldType = reader.MoveNext()) != IonType.None)
{
if (reader.CurrentIsNull)
{
continue;
}
var sid = reader.GetFieldNameSymbol().Sid;
if (sid == SymbolToken.UnknownSid)
{
// This is a user-defined IonReader or a pure DOM, fall
// back to text.
sid = SystemSymbols.ResolveSidForSymbolTableField(reader.CurrentFieldName);
}
switch (sid)
{
case SystemSymbols.SymbolsSid:
// As per the spec, other field types are treated as
// empty lists.
if (foundLocals)
{
throw new IonException("Multiple symbol fields found within a single local symbol table.");
}
foundLocals = true;
if (fieldType == IonType.List)
{
ReadSymbolList(reader, newSymbols);
}
break;
case SystemSymbols.ImportsSid:
if (foundImport)
{
throw new IonException("Multiple imports fields found within a single local symbol table.");
}
foundImport = true;
if (fieldType == IonType.List)
{
// List of symbol tables to imports.
ReadImportList(reader, catalog, imports);
}
// Trying to import the current table.
else if (fieldType == IonType.Symbol &&
reader.GetSymbolTable().IsLocal &&
(SystemSymbols.IonSymbolTable.Equals(reader.StringValue()) || reader.IntValue() == SystemSymbols.IonSymbolTableSid))
{
var currentSymbolTable = reader.GetSymbolTable();
var declaredSymbols = currentSymbolTable.GetDeclaredSymbolNames();
if (foundLocals)
{
// Ordering matters. Maintain order as 'symbols'
// and 'imports' fields can come in any order.
newSymbols.InsertRange(0, declaredSymbols);
}
else
{
newSymbols.AddRange(declaredSymbols);
}
}
break;
default:
// As per the spec, any other field is ignored.
break;
}
}
reader.StepOut();
symbols.Clear();
// If there were prior imports and now only a system table is
// seen, then start fresh again as prior imports no longer matter.
if (imports.Count > 1 && !foundImport && foundLocals)
{
imports.RemoveAll(symbolTable => symbolTable.IsSubstitute == true);
}
symbols.AddRange(newSymbols);
table.Refresh();
return(table);
}