public static void Evaluate(CursorStatement statement, Scope scope)
{
// TODO: global cursors? statement.Cursor.IsGlobal
var name = statement.Cursor.Name.Value;
var cursor = (Cursor)scope.Env.Vars[name];
switch (statement)
{
case OpenCursorStatement _:
cursor.Open(scope);
return;
case CloseCursorStatement _:
cursor.Close();
return;
case DeallocateCursorStatement _:
cursor.Deallocate();
return;
case FetchCursorStatement fetch:
var result = CursorFetch(fetch, cursor, scope);
scope.Env.FetchStatus = result == null ? 1 : 0;
if (result == null)
{
return;
}
foreach (var(v, x) in fetch.IntoVariables.Zip(result.Values, (v, x) => (v, x)))
{
scope.Env.Vars.DeclareOrSet(v.Name, x);
}
return;
default:
throw FeatureNotSupportedException.Subtype(statement);
}
}
public override void Visit(CursorStatement node)
{
ErrorCallback(RULE_NAME, RULE_TEXT, node.StartLine, node.StartColumn);
}
public override void ExplicitVisit(CursorStatement fragment)
{
_fragments.Add(fragment);
}
public override void Visit(CursorStatement node)
{
errorCallback(RULE_NAME, RULE_TEXT, node.StartLine, GetColumnNumber(node));
}
public sealed override void ExplicitVisit(CursorStatement node)
{
base.ExplicitVisit(node);
}
public sealed override void Visit(CursorStatement node)
{
base.Visit(node);
}
public override void ExplicitVisit(CursorStatement node) { this.action(node); }
