/// <summary>
/// Removes the import at the specified index (which must be in the range of
/// the Names property) and returns a new ImportStatement which is the same
/// as this one minus the imported name. Preserves all round-tripping metadata
/// in the process.
///
/// New in 1.1.
/// </summary>
public ImportStatement RemoveImport(PythonAst ast, int index)
{
if (index < 0 || index >= _names.Length)
{
throw new ArgumentOutOfRangeException("index");
}
if (ast == null)
{
throw new ArgumentNullException("ast");
}
var names = new ModuleName[_names.Length - 1];
var asNames = _asNames == null ? null : new NameExpression[_asNames.Length - 1];
var asNameWhiteSpace = this.GetNamesWhiteSpace(ast);
var itemWhiteSpace = this.GetListWhiteSpace(ast);
var newAsNameWhiteSpace = new List <string>();
var newListWhiteSpace = new List <string>();
var asIndex = 0;
for (int i = 0, write = 0; i < _names.Length; i++)
{
var includingCurrentName = i != index;
// track the white space, this needs to be kept in sync w/ ToCodeString and how the
// parser creates the white space.
if (i > 0 && itemWhiteSpace != null)
{
if (includingCurrentName)
{
newListWhiteSpace.Add(itemWhiteSpace[i - 1]);
}
}
if (includingCurrentName)
{
names[write] = _names[i];
if (_asNames != null)
{
asNames[write] = _asNames[i];
}
write++;
}
if (AsNames[i] != null && includingCurrentName)
{
if (asNameWhiteSpace != null)
{
newAsNameWhiteSpace.Add(asNameWhiteSpace[asIndex++]);
}
if (_asNames[i].Name.Length != 0)
{
if (asNameWhiteSpace != null)
{
newAsNameWhiteSpace.Add(asNameWhiteSpace[asIndex++]);
}
}
}
}
var res = new ImportStatement(names, asNames, ForceAbsolute);
ast.CopyAttributes(this, res);
ast.SetAttribute(res, NodeAttributes.NamesWhiteSpace, newAsNameWhiteSpace.ToArray());
ast.SetAttribute(res, NodeAttributes.ListWhiteSpace, newListWhiteSpace.ToArray());
return(res);
}
public virtual void PostWalk(ModuleName node)
{
}
// ModuleName
public virtual bool Walk(ModuleName node)
{
return(true);
}
// ModuleName
public override bool Walk(ModuleName node)
{
return(Location >= node.StartIndex && Location <= node.EndIndex);
}
public override void PostWalk(ModuleName node)
{
}
// ModuleName
public override bool Walk(ModuleName node)
{
return(false);
}