private IDisposable EnterFunction(string name)
{
var fn = scope = function = new AnalysisScope.Function(scope, name);
return new Disposable(() =>
{
Assert.IsTrue(() => scope == function && function == fn);
scope = function.ParentScope;
if (scope is AnalysisScope.Function)
{
function = (AnalysisScope.Function)scope;
}
else
{
var s = scope.ParentScope;
var set = false;
while (s != null)
{
if (s is AnalysisScope.Function)
{
function = (AnalysisScope.Function)s;
set = true;
break;
}
s = s.ParentScope;
}
if (!set)
throw new InvalidOperationException("Invalid scope-chain");
}
});
}
private AstGenerator(AnalysisScope.TopLevel global)
{
this.global = global;
this.engine = global.Engine;
this.scope = this.function = new AnalysisScope.Function(global, "module", true);
}