/// <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;
}
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();
}
}
// 'from' relative_module 'import' identifier ['as' name] (',' identifier ['as' name]) *
// 'from' relative_module 'import' '(' identifier ['as' name] (',' identifier ['as' name])* [','] ')'
// 'from' module 'import' "*"
private FromImportStatement ParseFromImportStmt()
{
Eat(TokenKind.KeywordFrom);
string fromWhiteSpace = _tokenWhiteSpace;
var start = GetStart();
ModuleName dname = ParseRelativeModuleName();
bool ateImport = Eat(TokenKind.KeywordImport);
string importWhiteSpace = _tokenWhiteSpace;
bool ateParen = ateImport && MaybeEat(TokenKind.LeftParenthesis);
string parenWhiteSpace = ateParen ? _tokenWhiteSpace : null;
NameExpression/*!*/[] names;
NameExpression[] asNames;
bool fromFuture = false;
List<string> namesWhiteSpace = null;
if (ateImport) {
if (MaybeEat(TokenKind.Multiply)) {
if (_langVersion.Is7x() && ((_functions != null && _functions.Count > 0) || _classDepth > 0)) {
ReportSyntaxError(start, GetEnd(), "import * only allowed at module level");
}
if (_verbatim) {
namesWhiteSpace = new List<string>() { _tokenWhiteSpace };
}
names = new[] { new NameExpression("*") };
asNames = null;
} else {
List<NameExpression/*!*/> l = new List<NameExpression>();
List<NameExpression> las = new List<NameExpression>();
ParseAsNameList(l, las, out namesWhiteSpace);
names = l.ToArray();
asNames = las.ToArray();
}
} else {
names = EmptyNames;
asNames = EmptyNames;
}
// Process from __future__ statement
if (dname.Names.Count == 1 && dname.Names[0].Name == "__future__") {
fromFuture = ProcessFutureStatements(start, names, fromFuture);
}
bool ateRightParen = false;
if (ateParen) {
ateRightParen = Eat(TokenKind.RightParenthesis);
}
FromImportStatement ret = new FromImportStatement(dname, names, asNames, fromFuture, AbsoluteImports);
if (_verbatim) {
AddPreceedingWhiteSpace(ret, fromWhiteSpace);
AddSecondPreceedingWhiteSpace(ret, importWhiteSpace);
if (namesWhiteSpace != null) {
AddNamesWhiteSpace(ret, namesWhiteSpace.ToArray());
}
if (ateParen) {
AddThirdPreceedingWhiteSpace(ret, parenWhiteSpace);
AddFourthPreceedingWhiteSpace(ret, _tokenWhiteSpace);
if (!ateRightParen) {
AddErrorMissingCloseGrouping(ret);
}
} else {
AddIsAltForm(ret);
}
if (!ateImport) {
AddErrorIsIncompleteNode(ret);
}
}
ret.SetLoc(start, GetEnd());
return ret;
}
public UpdatedFromImportStatement(FromImportStatement fromImport)
{
_fromImport = fromImport;
}
// FromImportStmt
public override bool Walk(FromImportStatement node)
{
if (node.Names.Count != 1 || node.Names[0].Name != "*") {
for (int i = 0; i < node.Names.Count; i++) {
Define(node.AsNames[i] != null ? node.AsNames[i].Name : node.Names[i].Name);
}
}
return true;
}
public override bool Walk(FromImportStatement node)
{
if (InTargetScope && !node.IsFromFuture && !(_scopes[_scopes.Count - 1] is ClassDefinition)) {
for (int i = 0; i < node.Names.Count; i++) {
if (node.Names[i].Name == "*") {
// ignore from .. import *
continue;
}
if (node.AsNames != null && node.AsNames[i] != null) {
TrackImport(node, node.AsNames[i].Name);
} else {
TrackImport(node, node.Names[i].Name);
}
}
}
return base.Walk(node);
}
public RemovedFromImportStatement(FromImportStatement fromImport)
{
_fromImport = fromImport;
}
public override bool Walk(FromImportStatement node)
{
UpdateChildRanges(node);
var asNames = node.AsNames ?? node.Names;
int len = Math.Min(node.Names.Count, asNames.Count);
for (int i = 0; i < len; i++) {
var nameNode = asNames[i] ?? node.Names[i];
if (nameNode != null) {
CreateVariableInDeclaredScope(nameNode);
}
}
return base.Walk(node);
}
// FromImportStatement
public override bool Walk(FromImportStatement node)
{
return ShouldWalkWorker(node);
}
public override void PostWalk(FromImportStatement node)
{
PostWalkWorker(node);
}
public override bool Walk(FromImportStatement node)
{
var vars = node.Variables;
var refs = node.GetReferences(_root);
if (refs != null) { // from .. import * will have null refs
for (int i = 0; i < vars.Length; i++) {
if (vars[i] != null) {
_allWrites.Add(refs[i]);
_allWrittenVariables.Add(vars[i]);
}
}
}
return base.Walk(node);
}
public override bool Walk(FromImportStatement node)
{
if (node.Names.Count == 1 && node.Names[0].Name == "*") {
ContainsImportStar = true;
}
return base.Walk(node);
}