jqsh::parser::Code

clone.rs

impl Clone for Code {
    fn clone(&self) -> Code {
        let mut lock = self.0.lock().unwrap();
        match *&mut *lock {
            CodeVariant::Empty => Code(Mutex::new(CodeVariant::Empty)),
            CodeVariant::UString { ref s, .. } => Code(Mutex::new(CodeVariant::UString { s: s.clone(), peek_index: 0 })),
            CodeVariant::UStringIter(_) => {
                if let CodeVariant::UStringIter(it) = mem::replace(&mut *lock, CodeVariant::Mutation) {
                    let s = it.collect::<UString>();
                    *lock = CodeVariant::UString { s: s.clone(), peek_index: 0 };
                    Code(Mutex::new(CodeVariant::UString { s: s, peek_index: 0 }))
                } else {
                    unreachable!()
                }
            }
            CodeVariant::Mutation => panic!("code mutex has been emptied")
        }
    }
}