public Node VisitExpression(IronPython.Compiler.Ast.IndexExpression exp)
{
var changed = false;
Node newCode = exp;
foreach (var edit in _edits)
{
if (edit.CanApply(exp))
{
changed = true;
if (edit is Update)
{
newCode = edit.ModifiedNode.InnerNode;
}
else if (edit is Insert)
{
throw new NotImplementedException();
}
else
{
throw new NotImplementedException();
}
}
}
if (changed)
{
return(newCode);
}
return(new IronPython.Compiler.Ast.IndexExpression(VisitExpression(exp.Target),
VisitExpression(exp.Index)));
}
public override void PostWalk(IndexExpression node)
{
SliceExpression slice = node.Index as SliceExpression;
if (slice != null)
{
List<string> parts = new List<string>();
parts.Add(slice.SliceStop != null ? Content() : "null");
if (slice.SliceStep != null)
{
Content();
}
parts.Add(slice.SliceStart != null ? Content() : "null");
string target = Content();
Content("{0}.slice({1})", target, String.Join(", ", parts));
}
else
{
string index = Content();
string target = Content();
Content("{0}[{1}]", target, index);
}
CommonPostWalk(node);
}
public override bool Walk(IndexExpression node)
{
CommonWalk(node);
return true;
}
// IndexExpression
public bool Walk(IndexExpression node)
{
return Process(node);
}
public void PostWalk(IndexExpression node)
{
PostProcess(node);
}
internal Subscript(IndexExpression expr, expr_context ctx)
: this()
{
_value = Convert(expr.Target);
_ctx = ctx;
_slice = TrySliceConvert(expr.Index);
if (_slice == null)
_slice = new Index(Convert(expr.Index));
}
/// <summary>
/// Deserializes a call expression where the target is an array expression.
///
/// System.Array[String](["a", "b"])
/// </summary>
object DeserializeCreateArrayExpression(CallExpression callExpression, IndexExpression target)
{
ListExpression list = callExpression.Args[0].Expression as ListExpression;
Type arrayType = GetType(target.Index as MemberExpression);
Array array = Array.CreateInstance(arrayType, list.Items.Count);
for (int i = 0; i < list.Items.Count; ++i) {
Expression listItemExpression = list.Items[i];
ConstantExpression constantExpression = listItemExpression as ConstantExpression;
MemberExpression memberExpression = listItemExpression as MemberExpression;
NameExpression nameExpression = listItemExpression as NameExpression;
CallExpression listItemCallExpression = listItemExpression as CallExpression;
if (constantExpression != null) {
array.SetValue(constantExpression.Value, i);
} else if (memberExpression != null) {
string name = PythonControlFieldExpression.GetVariableName(memberExpression.Name);
array.SetValue(componentCreator.GetComponent(name), i);
} else if (nameExpression != null) {
array.SetValue(componentCreator.GetInstance(nameExpression.Name), i);
} else if (listItemCallExpression != null) {
Type arrayInstanceType = GetType(listItemCallExpression.Target as MemberExpression);
object instance = componentCreator.CreateInstance(arrayInstanceType, GetArguments(listItemCallExpression), null, false);
array.SetValue(instance, i);
}
}
return array;
}
public override bool Walk(IndexExpression node)
{
writer.WriteLine("Index: " + node.Index.ToString());
return base.Walk(node);
}
public virtual void PostWalk(IndexExpression node)
{
}
// IndexExpression
public virtual bool Walk(IndexExpression node)
{
return true;
}
public override bool Walk(IndexExpression node)
{
node.Walk(_fc);
return(false);
}
public override bool Walk(IndexExpression node)
{
node.Parent = _currentScope;
return(base.Walk(node));
}
// trailer: '(' [ arglist_genexpr ] ')' | '[' subscriptlist ']' | '.' NAME
private Expression AddTrailers(Expression ret)
{
while (true) {
Token t = PeekToken();
switch (t.Kind) {
case TokenKind.LeftParenthesis:
NextToken();
Arg[] args = FinishArgListOrGenExpr();
CallExpression call = FinishCallExpr(ret, args);
call.SetLoc(GetExternal(), ret.Start, GetEnd());
ret = call;
break;
case TokenKind.LeftBracket:
NextToken();
Expression index = ParseSubscriptList();
IndexExpression ie = new IndexExpression(ret, index);
ie.SetLoc(GetExternal(), ret.Start, GetEnd());
ret = ie;
break;
case TokenKind.Dot:
NextToken();
SymbolId name = ReadNameMaybeNone();
FieldExpression fe = new FieldExpression(ret, name);
fe.SetLoc(GetExternal(), ret.Start, GetEnd());
ret = fe;
break;
default:
return ret;
}
}
}
public string Visit(PyAst.IndexExpression node) => $"{Visit(node.Target)}[{Visit(node.Index)}]";
internal Subscript(IndexExpression expr, expr_context ctx)
: this() {
_value = Convert(expr.Target);
AST index = Convert(expr.Index);
if (index is expr)
if (index is Tuple && ((TupleExpression)expr.Index).IsExpandable)
_slice = new ExtSlice(((Tuple)index).elts);
else
_slice = new Index((expr)index);
else if (index is slice) // includes Ellipsis
_slice = (slice)index;
else
throw new ArgumentTypeException("Unexpected index expression: " + expr.Index.GetType());
_ctx = ctx;
}
// trailer: '(' [ arglist_genexpr ] ')' | '[' subscriptlist ']' | '.' NAME
private Expression AddTrailers(Expression ret, bool allowGeneratorExpression) {
bool prevAllow = _allowIncomplete;
try {
_allowIncomplete = true;
while (true) {
switch (PeekToken().Kind) {
case TokenKind.LeftParenthesis:
if (!allowGeneratorExpression) return ret;
NextToken();
Arg[] args = FinishArgListOrGenExpr();
CallExpression call;
if (args != null) {
call = FinishCallExpr(ret, args);
} else {
call = new CallExpression(ret, new Arg[0]);
}
call.SetLoc(_globalParent, ret.StartIndex, GetEnd());
ret = call;
break;
case TokenKind.LeftBracket:
NextToken();
Expression index = ParseSubscriptList();
IndexExpression ie = new IndexExpression(ret, index);
ie.SetLoc(_globalParent, ret.StartIndex, GetEnd());
ret = ie;
break;
case TokenKind.Dot:
NextToken();
string name = ReadNameMaybeNone();
MemberExpression fe = new MemberExpression(ret, name);
fe.SetLoc(_globalParent, ret.StartIndex, GetEnd());
ret = fe;
break;
case TokenKind.Constant:
// abc.1, abc"", abc 1L, abc 0j
ReportSyntaxError("invalid syntax");
return Error();
default:
return ret;
}
}
} finally {
_allowIncomplete = prevAllow;
}
}
public override bool Walk(IndexExpression node) {
node.Walk(_fc);
return false;
}