Struct property accessable from method but not from outside - rust

Question

I'm trying to build a basic web crawler in Rust, which I'm trying to port to html5ever. As of right now, I have a function with a struct inside that is supposed to return a Vec<String>. It gets this Vec from the struct in the return statement. Why does it always return an empty vector? (Does it have anything to do with the lifetime parameters?)
fn find_urls_in_html<'a>(
original_url: &Url,
raw_html: String,
fetched_cache: &Vec<String>,
) -> Vec<String> {
#[derive(Clone)]
struct Sink<'a> {
original_url: &'a Url,
returned_vec: Vec<String>,
fetched_cache: &'a Vec<String>,
}
impl<'a> TokenSink for Sink<'a> {
type Handle = ();
fn process_token(&mut self, token: Token, _line_number: u64) -> TokenSinkResult<()> {
trace!("token {:?}", token);
match token {
TagToken(tag) => {
if tag.kind == StartTag && tag.attrs.len() != 0 {
let _attribute_name = get_attribute_for_elem(&tag.name);
if _attribute_name == None {
return TokenSinkResult::Continue;
}
let attribute_name = _attribute_name.unwrap();
for attribute in &tag.attrs {
if &attribute.name.local != attribute_name {
continue;
}
trace!("element {:?} found", tag);
add_urls_to_vec(
repair_suggested_url(
self.original_url,
(&attribute.name.local, &attribute.value),
),
&mut self.returned_vec,
&self.fetched_cache,
);
}
}
}
ParseError(error) => {
warn!("error parsing html for {}: {:?}", self.original_url, error);
}
_ => {}
}
return TokenSinkResult::Continue;
}
}
let html = Sink {
original_url: original_url,
returned_vec: Vec::new(),
fetched_cache: fetched_cache,
};
let mut byte_tendril = ByteTendril::new();
{
let tendril_push_result = byte_tendril.try_push_bytes(&raw_html.into_bytes());
if tendril_push_result.is_err() {
warn!("error pushing bytes to tendril: {:?}", tendril_push_result);
return Vec::new();
}
}
let mut queue = BufferQueue::new();
queue.push_back(byte_tendril.try_reinterpret().unwrap());
let mut tok = Tokenizer::new(html.clone(), std::default::Default::default()); // default default! default?
let feed = tok.feed(&mut queue);
return html.returned_vec;
}
The output ends with no warning (and a panic, caused by another function due to this being empty). Can anyone help me figure out what's going on?
Thanks in advance.

Answer 1

When I initialize the Tokenizer, I use:
let mut tok = Tokenizer::new(html.clone(), std::default::Default::default());
The problem is that I'm telling the Tokenizer to use html.clone() instead of html. As such, it is writing returned_vec to the cloned object, not html. Changing a few things, such as using a variable with mutable references, fixes this problem.