public static BoundScope CreateParentScopes(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 BindForStatement(ForStatementSyntax syntax)
{
var lowerBound = BindExpression(syntax.LowerBound, TypeSymbol.Int);
var upperBound = BindExpression(syntax.UpperBound, TypeSymbol.Int);
_scope = new BoundScope(_scope);
// TODO (R) isReadOnly: true by Immo
var variable = DeclareVariable(syntax.Identifier, TypeSymbol.Int, false);
var statement = BindStatement(syntax.Statement);
_scope = _scope.Parent;
return(new BoundForStatement(variable, lowerBound, upperBound, statement));
}
private BoundStatement BindBlockStatement(BlockStatementSyntax statement)
{
var statements = ImmutableArray.CreateBuilder <BoundStatement>();
_scope = new BoundScope(_scope);
foreach (var s in statement.Statements)
{
statements.Add(BindStatement(s));
}
_scope = _scope.Parent;
return(new BoundBlockStatement(statements.ToImmutable()));
}
private Binder(BoundScope parent)
{
_scope = new BoundScope(parent);
}
public BoundScope(BoundScope parent)
{
Parent = parent;
_variables = new Dictionary <string, VariableSymbol>();
}