fn is_valid_url_scheme()

in glean-core/src/metrics/url.rs [46:61]

• 12 lines of code
• 5 McCabe index (conditional complexity)

    fn is_valid_url_scheme(&self, value: String) -> bool {
        let mut splits = value.split(':');
        if let Some(scheme) = splits.next() {
            if scheme.is_empty() {
                return false;
            }
            let mut chars = scheme.chars();
            // The list of characters allowed in the scheme is on
            // the spec here: https://url.spec.whatwg.org/#url-scheme-string
            return chars.next().unwrap().is_ascii_alphabetic()
                && chars.all(|c| c.is_ascii_alphanumeric() || ['+', '-', '.'].contains(&c));
        }

        // No ':' found, this is not valid :)
        false
    }