private void _addButton_Click(object sender, EventArgs e)
{
var expression = new AssignmentExpression(new VariableExpression("?"), new LiteralExpression("[[?]]?"));
var oldIndex = SelectedLineIndex;
var head = _root.Children.Take(oldIndex + 1);
var @new = new ExpressionStatement(expression);
var tail = _root.Children.Skip(oldIndex + 1);
var newchi = head.Concat(@new.AsArray()).Concat(tail).Cast<Statement>();
_root = (Block)_root.ReplaceMeWith(() => new Block(newchi));
RebuildTopPanelContent();
SelectedLineIndex = oldIndex + 1;
}
private IEnumerable<ElfVmInstruction> CompileExpression(ExpressionStatement es)
{
// todo. would be nice to somehow guard ourselves against useless expressions, but how?
// so far any expression can be meaningful because of side-effects
foreach (var evi in Compile(es.Expression))
yield return evi;
// every expression results in a value on the stack
// when we abandon the expression, we should get rid of that value
yield return new Pop();
}