public bool HandleFor(ForStatement node)
{
var iterable = Eval.GetValueFromExpression(node.List);
var iterator = (iterable as IPythonIterable)?.GetIterator();
var value = iterator?.Next ?? Eval.UnknownType;
switch (node.Left)
{
case NameExpression nex:
// for x in y:
if (!string.IsNullOrEmpty(nex.Name))
{
Eval.DeclareVariable(nex.Name, value, VariableSource.Declaration, Eval.GetLoc(nex));
}
break;
case TupleExpression tex:
// x = [('abc', 42, True), ('abc', 23, False)]
// for some_str, (some_int, some_bool) in x:
var h = new TupleExpressionHandler(Walker);
h.HandleTupleAssignment(tex, node.List, value);
break;
}
node.Body?.Walk(Walker);
return(false);
}
public async Task HandleAssignmentAsync(AssignmentStatement node, CancellationToken cancellationToken = default)
{
cancellationToken.ThrowIfCancellationRequested();
var value = await Eval.GetValueFromExpressionAsync(node.Right, cancellationToken);
if (value.IsUnknown())
{
Log?.Log(TraceEventType.Verbose, $"Undefined value: {node.Right.ToCodeString(Ast).Trim()}");
}
if (value?.GetPythonType().TypeId == BuiltinTypeId.Ellipsis)
{
value = Eval.UnknownType;
}
if (node.Left.FirstOrDefault() is TupleExpression lhs)
{
// Tuple = Tuple. Transfer values.
var texHandler = new TupleExpressionHandler(Walker);
await texHandler.HandleTupleAssignmentAsync(lhs, node.Right, value, cancellationToken);
return;
}
foreach (var expr in node.Left.OfType <ExpressionWithAnnotation>())
{
// x: List[str] = [...]
await HandleAnnotatedExpressionAsync(expr, value, cancellationToken);
}
foreach (var ne in node.Left.OfType <NameExpression>())
{
if (Eval.CurrentScope.NonLocals[ne.Name] != null)
{
Eval.LookupNameInScopes(ne.Name, out var scope, LookupOptions.Nonlocal);
if (scope != null)
{
scope.Variables[ne.Name].Value = value;
}
else
{
// TODO: report variable is not declared in outer scopes.
}
continue;
}
if (Eval.CurrentScope.Globals[ne.Name] != null)
{
Eval.LookupNameInScopes(ne.Name, out var scope, LookupOptions.Global);
if (scope != null)
{
scope.Variables[ne.Name].Value = value;
}
else
{
// TODO: report variable is not declared in global scope.
}
continue;
}
Eval.DeclareVariable(ne.Name, value, Eval.GetLoc(ne));
}
}
public void HandleAssignment(AssignmentStatement node)
{
if (node.Right is ErrorExpression)
{
return;
}
var value = Eval.GetValueFromExpression(node.Right) ?? Eval.UnknownType;
// Check PEP hint first
var valueType = Eval.GetTypeFromPepHint(node.Right);
if (valueType != null)
{
HandleTypedVariable(valueType, value, node.Left.FirstOrDefault());
return;
}
if (value.IsUnknown())
{
Log?.Log(TraceEventType.Verbose, $"Undefined value: {node.Right.ToCodeString(Ast).Trim()}");
}
if (value?.GetPythonType().TypeId == BuiltinTypeId.Ellipsis)
{
value = Eval.UnknownType;
}
if (node.Left.FirstOrDefault() is TupleExpression lhs)
{
// Tuple = Tuple. Transfer values.
var texHandler = new TupleExpressionHandler(Walker);
texHandler.HandleTupleAssignment(lhs, node.Right, value);
return;
}
// Process annotations, if any.
foreach (var expr in node.Left.OfType <ExpressionWithAnnotation>())
{
// x: List[str] = [...]
HandleAnnotatedExpression(expr, value);
}
foreach (var ne in node.Left.OfType <NameExpression>())
{
if (Eval.CurrentScope.NonLocals[ne.Name] != null)
{
Eval.LookupNameInScopes(ne.Name, out var scope, LookupOptions.Nonlocal);
if (scope != null)
{
scope.Variables[ne.Name].Assign(value, Eval.GetLoc(ne));
}
else
{
// TODO: report variable is not declared in outer scopes.
}
continue;
}
if (Eval.CurrentScope.Globals[ne.Name] != null)
{
Eval.LookupNameInScopes(ne.Name, out var scope, LookupOptions.Global);
if (scope != null)
{
scope.Variables[ne.Name].Assign(value, Eval.GetLoc(ne));
}
else
{
// TODO: report variable is not declared in global scope.
}
continue;
}
var source = value.IsGeneric() ? VariableSource.Generic : VariableSource.Declaration;
Eval.DeclareVariable(ne.Name, value ?? Module.Interpreter.UnknownType, source, Eval.GetLoc(ne));
}
TryHandleClassVariable(node, value);
}