/**
* Returns the File currently being lexed.
*
* <p>If this Source is not a {@link FileLexerSource}, then it will ask the parent Source, and so
* forth recursively. If no Source on the stack is a FileLexerSource, returns null.
*/
protected String getPath() {
Source parent = getParent();
while (parent != null) {
String path = parent.getPath();
if (path != null) return path;
parent = parent.getParent();
}
return null;
}
