private static BoundScope CreateParentScopes(BoundGlobalScope previous)
{
// create scopes in the opposite order
// submission 3 => submission 2 => submission 1
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 variable in previous.Variables)
{
scope.TryDeclare(variable);
}
parent = scope;
}
return(parent);
}
public BoundGlobalScope(BoundGlobalScope previous
, ImmutableArray <Diagnostic> diagnostics, ImmutableArray <VariableSymbol> variables, BoundStatement statement)
{
Previous = previous;
Diagnostics = diagnostics;
Variables = variables;
Statement = statement;
}
/// <summary>
/// All previous submissions are parent scopes to the current scope
/// </summary>
/// <param name="previous"></param>
/// <param name="syntax"></param>
/// <returns></returns>
public static BoundGlobalScope BindGlobalScope(BoundGlobalScope previous, CompliationUnitSyntax syntax)
{
var parentScope = CreateParentScopes(previous);
var binder = new Binder(parentScope);
var expression = binder.BindStatement(syntax.Statement);
var variables = binder._scope.GetDeclaredVariables();
var diagnostics = binder.Diagnostics.ToImmutableArray();
if (previous != null)
{
diagnostics = diagnostics.InsertRange(0, previous.Diagnostics);
}
return(new BoundGlobalScope(previous, diagnostics, variables, expression));
}