private String debugHiddenBefore(AST ast) {
if (!(ast instanceof antlr.CommonASTWithHiddenTokens)) {
return "";
}
antlr.CommonHiddenStreamToken parent =
((antlr.CommonASTWithHiddenTokens) ast).getHiddenBefore();
if (parent == null) {
return "";
}
antlr.CommonHiddenStreamToken child = null;
do {
child = parent;
parent = child.getHiddenBefore();
} while (parent != null);
return debugHiddenTokens(child);
}
