public virtual void PostWalk(NonlocalStatement node) { }
// NonlocalStatement public virtual bool Walk(NonlocalStatement node) { return(true); }
// NonlocalStatement public override bool Walk(NonlocalStatement node) { return(Contains(node)); }
public override void PostWalk(NonlocalStatement node) { }
// NonlocalStatement public override bool Walk(NonlocalStatement node) { return(false); }
public override bool Walk(NonlocalStatement node) { foreach (var nameNode in node.Names) { var n = nameNode.Name; if (n == null) { continue; } // Check current scope for conflicting variable var assignedLocal = false; if (_currentScope.TryGetVariable(n, out var conflict)) { // conflict? switch (conflict.Kind) { case VariableKind.Global: ReportSyntaxError("name '{0}' is nonlocal and global".FormatUI(n), node); break; case VariableKind.Local: assignedLocal = true; ReportSyntaxWarning( "name '{0}' is assigned to before nonlocal declaration".FormatUI(n), node ); break; case VariableKind.Parameter: ReportSyntaxError( "name '{0}' is a parameter and nonlocal".FormatUI(n), node); break; case VariableKind.Nonlocal: // OK to reassign as long as kind is the same. // Consider example from Python test grammar: // nonlocal x // nonlocal x, y assignedLocal = true; break; } } // Check for the name being referenced previously. If it has been, issue warning. if (_currentScope.IsReferenced(n) && !assignedLocal) { ReportSyntaxWarning( "name '{0}' is used prior to nonlocal declaration".FormatUI(n), node); } if (conflict == null) { // no previously definied variables, add it to the current scope _currentScope.CreateVariable(n, VariableKind.Nonlocal); } _currentScope.AddNonLocalVariable(nameNode); nameNode.AddVariableReference(GlobalScope, BindReferences, Reference(n)); } return(true); }