private static BoundScope CreateParentScope(BoundGlobalScope previous)
{
var stack = new Stack <BoundGlobalScope>();
while (previous != null)
{
stack.Push(previous);
previous = previous.Previous;
}
BoundScope parent = null;
while (stack.Count > 0)
{
previous = stack.Pop();
var scope = new BoundScope(parent);
foreach (var v in previous.Variables)
{
scope.TryDeclare(v);
}
parent = scope;
}
return(parent);
}
private BoundStatement BindVariableDeclarationStatement(VariableDeclarationSyntax syntax)
{
var name = syntax.Identifier.Text;
var isReadOnly = syntax.Keyword.Kind == SyntaxKind.LetKeyword;
var initializer = BindExpression(syntax.Initializer);
var variable = new VariableSymbol(name, isReadOnly, initializer.Type);
if (!_scope.TryDeclare(variable))
{
_diagnostics.ReportVariableAlreadyDeclared(syntax.Identifier.Span, name);
}
return(new BoundVariableDeclaration(variable, initializer));
}