/// <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);
}
/// <summary>
/// Returns a new FromImport statement that is identical to this one but has
/// removed the specified import statement. Otherwise preserves any attributes
/// for the statement.
///
/// New in 1.1.
/// <param name="ast">The parent AST whose attributes should be updated for the new node.</param>
/// <param name="index">The index in Names of the import to be removed.</param>
/// </summary>
public FromImportStatement RemoveImport(PythonAst ast, int index)
{
if (index < 0 || index >= Names.Count)
{
throw new ArgumentOutOfRangeException("index");
}
if (ast == null)
{
throw new ArgumentNullException("ast");
}
var names = new NameExpression[Names.Count - 1];
var asNames = AsNames == null ? null : new NameExpression[AsNames.Count - 1];
var asNameWhiteSpace = this.GetNamesWhiteSpace(ast);
var newAsNameWhiteSpace = new List <string>();
var importIndex = ImportIndex;
var asIndex = 0;
for (int i = 0, write = 0; i < Names.Count; 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 (asNameWhiteSpace != null && asIndex < asNameWhiteSpace.Length)
{
if (write > 0)
{
if (includingCurrentName)
{
newAsNameWhiteSpace.Add(asNameWhiteSpace[asIndex++]);
}
else
{
asIndex++;
}
}
else if (i > 0)
{
asIndex++;
}
}
if (asNameWhiteSpace != null && asIndex < asNameWhiteSpace.Length)
{
if (includingCurrentName)
{
if (newAsNameWhiteSpace.Count == 0)
{
// no matter what we want the 1st entry to have the whitespace after the import keyword
newAsNameWhiteSpace.Add(asNameWhiteSpace[0]);
asIndex++;
}
else
{
newAsNameWhiteSpace.Add(asNameWhiteSpace[asIndex++]);
}
}
else
{
asIndex++;
}
}
if (includingCurrentName)
{
names[write] = Names[i];
if (AsNames != null)
{
asNames[write] = AsNames[i];
}
write++;
}
if (AsNames != null && AsNames[i] != null)
{
if (asNameWhiteSpace != null && asIndex < asNameWhiteSpace.Length)
{
if (i != index)
{
newAsNameWhiteSpace.Add(asNameWhiteSpace[asIndex++]);
}
else
{
asIndex++;
}
}
if (AsNames[i].Name.Length != 0)
{
if (asNameWhiteSpace != null && asIndex < asNameWhiteSpace.Length)
{
if (i != index)
{
newAsNameWhiteSpace.Add(asNameWhiteSpace[asIndex++]);
}
else
{
asIndex++;
}
}
}
else
{
asIndex++;
}
}
}
if (asNameWhiteSpace != null && asIndex < asNameWhiteSpace.Length)
{
// trailing comma
newAsNameWhiteSpace.Add(asNameWhiteSpace[asNameWhiteSpace.Length - 1]);
}
var res = new FromImportStatement(Root, names, asNames, IsFromFuture, ForceAbsolute, importIndex);
ast.CopyAttributes(this, res);
ast.SetAttribute(res, NodeAttributes.NamesWhiteSpace, newAsNameWhiteSpace.ToArray());
return(res);
}