public void NodeFromRangeTest()
{
AstRoot ast = RParser.Parse(new TextStream(" x <- a123+b"));
IAstNode node = ast.NodeFromRange(new TextRange(2, 5));
node.Should().BeAssignableTo <IOperator>();
node = ast.NodeFromRange(new TextRange(7, 2));
node.Should().BeOfType <Variable>();
}
/// <summary>
/// Removes nodes from the tree collection if node range is partially or entirely
/// within the deleted region. This is needed since parsing is asynchronous and
/// without node removal intellisense and syntax checker may end up processing
/// nodes that are out of date. Where possible stops at the nearest scope level
/// so scope nodes may still be used in smart indenter.
/// </summary>
/// <param name="range">Range to invalidate elements in</param>
internal bool InvalidateInRange(ITextRange range)
{
var removedElements = new List <IAstNode>();
int firstToRemove = -1;
int lastToRemove = -1;
var node = AstRoot.NodeFromRange(range);
var scope = node as IScope;
while (scope == null || scope.OpenCurlyBrace == null || scope.CloseCurlyBrace == null ||
TextRange.Intersect(range, scope.OpenCurlyBrace) || TextRange.Intersect(range, scope.CloseCurlyBrace))
{
scope = node.GetEnclosingScope();
if (scope is GlobalScope)
{
break;
}
node = scope;
}
for (int i = 0; i < scope.Children.Count; i++)
{
var child = scope.Children[i];
if (TextRange.Intersect(range, child))
{
if (firstToRemove < 0)
{
firstToRemove = i;
}
else
{
lastToRemove = i;
}
}
}
if (firstToRemove >= 0)
{
if (lastToRemove < 0)
{
lastToRemove = firstToRemove;
}
for (int i = firstToRemove; i <= lastToRemove; i++)
{
IAstNode child = scope.Children[i];
removedElements.Add(child);
_astRoot.Errors.RemoveInRange(child);
}
scope.RemoveChildren(firstToRemove, lastToRemove - firstToRemove + 1);
}
if (removedElements.Count > 0)
{
FireOnNodesRemoved(removedElements);
return(true);
}
return(false);
}