Function collection_repr

crates/vm/src/utils.rs:40–74

(
    class_name: Option<&str>,
    prefix: &str,
    suffix: &str,
    iter: I,
    vm: &VirtualMachine,
)

impl ToCString for PyUtf8Str {}

pub(crate) fn collection_repr<'a, I>(
    class_name: Option<&str>,
    prefix: &str,
    suffix: &str,
    iter: I,
    vm: &VirtualMachine,
) -> PyResult<Wtf8Buf>
where
    I: core::iter::Iterator<Item = &'a PyObjectRef>,
{
    let mut repr = Wtf8Buf::new();
    if let Some(name) = class_name {
        repr.push_str(name);
        repr.push_char('(');
    }
    repr.push_str(prefix);
    {
        let mut parts_iter = iter.map(|o| o.repr(vm));
        let first = parts_iter
            .next()
            .transpose()?
            .expect("this is not called for empty collection");
        repr.push_wtf8(first.as_wtf8());
        for part in parts_iter {
            repr.push_str(", ");
            repr.push_wtf8(part?.as_wtf8());
        }
    }
    repr.push_str(suffix);
    if class_name.is_some() {
        repr.push_char(')');
    }

    Ok(repr)
}