fn consume_repository_name()

in util/label/label.rs [66:103]

• 37 lines of code
• 9 McCabe index (conditional complexity)

fn consume_repository_name<'s>(
    input: &'s str,
    label: &'s str,
) -> Result<(&'s str, Option<&'s str>)> {
    if !input.starts_with('@') {
        return Ok((input, None));
    }

    let slash_pos = input
        .find("//")
        .ok_or_else(|| err(label, "labels with repository must contain //."))?;
    let repository_name = &input[1..slash_pos];
    if repository_name.is_empty() {
        return Ok((&input[1..], None));
    }
    if !repository_name
        .chars()
        .next()
        .unwrap()
        .is_ascii_alphabetic()
    {
        return Err(LabelError(err(
            label,
            "workspace names must start with a letter.",
        )));
    }
    if !repository_name
        .chars()
        .all(|c| c.is_ascii_alphanumeric() || c == '-' || c == '_' || c == '.')
    {
        return Err(LabelError(err(
            label,
            "workspace names \
                may contain only A-Z, a-z, 0-9, '-', '_', and '.'.",
        )));
    }
    Ok((&input[slash_pos..], Some(repository_name)))
}