private static BoundScope CreateParentScope(BoundGlobalScope previous)
{
var stack = new Stack <BoundGlobalScope>();
while (previous != null)
{
stack.Push(previous);
previous = previous.Previous;
}
var parent = CreateRootScope();
while (stack.Count > 0)
{
previous = stack.Pop();
var scope = new BoundScope(parent);
foreach (var f in previous.Functions)
{
scope.TryDeclareFunction(f);
}
foreach (var v in previous.Variables)
{
scope.TryDeclareVariable(v);
}
parent = scope;
}
return(parent);
}
public Binder(BoundScope parent, FunctionSymbol function)
{
_scope = new BoundScope(parent);
_function = function;
if (function != null)
{
foreach (var p in function.Parameters)
{
_scope.TryDeclareVariable(p);
}
}
}
private VariableSymbol BindVariable(SyntaxToken identifier, bool isReadOnly, TypeSymbol type)
{
var name = identifier.Text ?? "?";
var declare = !identifier.IsMissing;
var variable = new VariableSymbol(name, isReadOnly, type);
if (declare && !scope.TryDeclareVariable(variable))
{
diagnostics.ReportVariableAlreadyDeclared(identifier.Span, name);
}
return(variable);
}
private VariableSymbol BindVariable(SyntaxToken identifier, bool isReadOnly, TypeSymbol type)
{
var name = identifier.Text ?? "?";
var declare = !identifier.IsMissing;
var variable = _function == null
? (VariableSymbol) new GlobalVariableSymbol(name, isReadOnly, type)
: new LocalVariableSymbol(name, isReadOnly, type);
if (declare && !_scope.TryDeclareVariable(variable))
{
_diagnostics.ReportSymbolAlreadyDeclared(identifier.Span, name);
}
return(variable);
}