private void UpdateFromImport(JAst curAst, FromImportStatement fromImport)
{
NameExpression[] names = new NameExpression[fromImport.Names.Count + 1];
NameExpression[] asNames = fromImport.AsNames == null ? null : new NameExpression[fromImport.AsNames.Count + 1];
NameExpression newName = new NameExpression(_name);
for (int i = 0; i < fromImport.Names.Count; i++) {
names[i] = fromImport.Names[i];
}
names[fromImport.Names.Count] = newName;
if (asNames != null) {
for (int i = 0; i < fromImport.AsNames.Count; i++) {
asNames[i] = fromImport.AsNames[i];
}
}
var newImport = new FromImportStatement((ModuleName)fromImport.Root, names, asNames, fromImport.IsFromFuture, fromImport.ForceAbsolute);
curAst.CopyAttributes(fromImport, newImport);
var newCode = newImport.ToCodeString(curAst);
var span = fromImport.GetSpan(curAst);
using (var edit = _buffer.CreateEdit()) {
edit.Delete(span.Start.Index, span.Length + fromImport.GetTrailingWhitespace(curAst).Length);
edit.Insert(span.Start.Index, newCode);
edit.Apply();
}
}
/// <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(JAst ast, int index)
{
if (index < 0 || index >= _names.Length) {
throw new ArgumentOutOfRangeException("index");
}
if (ast == null) {
throw new ArgumentNullException("ast");
}
NameExpression[] names = new NameExpression[_names.Length - 1];
NameExpression[] asNames = _asNames == null ? null : new NameExpression[_asNames.Length - 1];
var asNameWhiteSpace = this.GetNamesWhiteSpace(ast);
List<string> newAsNameWhiteSpace = new List<string>();
int asIndex = 0;
for (int i = 0, write = 0; i < _names.Length; i++) {
bool 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);
ast.CopyAttributes(this, res);
ast.SetAttribute(res, NodeAttributes.NamesWhiteSpace, newAsNameWhiteSpace.ToArray());
return res;
}
/// <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(JAst ast, int index)
{
if (index < 0 || index >= _names.Length) {
throw new ArgumentOutOfRangeException("index");
}
if (ast == null) {
throw new ArgumentNullException("ast");
}
ModuleName[] names = new ModuleName[_names.Length - 1];
NameExpression[] asNames = _asNames == null ? null : new NameExpression[_asNames.Length - 1];
var asNameWhiteSpace = this.GetNamesWhiteSpace(ast);
var itemWhiteSpace = this.GetListWhiteSpace(ast);
List<string> newAsNameWhiteSpace = new List<string>();
List<string> newListWhiteSpace = new List<string>();
int asIndex = 0;
for (int i = 0, write = 0; i < _names.Length; i++) {
bool 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;
}
