Function class_names_from_data

src/completion/builder.rs:710–718

Extract the class name(s) from a `CompletionItem`'s `data` field. Returns a pipe-separated string of all class names (primary + extras), e.g. `"Lamp|Faucet"`. Returns `None` when the data field is absent or cannot be deserialized.

(item: &CompletionItem)

/// extras), e.g. `"Lamp|Faucet"`.  Returns `None` when the data
/// field is absent or cannot be deserialized.
fn class_names_from_data(item: &CompletionItem) -> Option<String> {
    let data_value = item.data.as_ref()?;
    let data: CompletionItemData = serde_json::from_value(data_value.clone()).ok()?;
    let mut names = vec![display_class_name(&data.class_name).to_string()];
    for extra in &data.extra_class_names {
        names.push(display_class_name(extra).to_string());
    }
    Some(names.join("|"))
}

/// Partition and sort completion items by union membership.
///