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