/// <summary>
/// 开始对指定的节点解析。
/// </summary>
/// <param name="script">语法树。</param>
/// <param name="comments">所有注释。</param>
/// <returns>全局对象。所有变量都可从这个节点找到。</returns>
public void Parse(Script script, DocComment[] comments)
{
_map = comments;
_position = 0;
CurrentScope = new Scope() { CurrentMemberOf = "window" };
VisitScript(script);
}
void PushScope(DocComment docComment)
{
Scope scope = new Scope();
scope.Comment = docComment;
scope.Parent = CurrentScope;
scope.CurrentMemberOf = CurrentScope.CurrentMemberOf;
scope.CurrentMemberOfIsClass = CurrentScope.CurrentMemberOfIsClass;
CurrentScope = scope;
}