fn build_fragments()

in prover/src/trace/trace_table.rs [281:316]
34 lines of code
2 McCabe index (conditional complexity)

    fn build_fragments(&mut self, fragment_length: usize) -> Vec<TraceTableFragment<B>> {
        assert!(
            fragment_length >= MIN_FRAGMENT_LENGTH,
            "fragment length must be at least {}, but was {}",
            MIN_FRAGMENT_LENGTH,
            fragment_length
        );
        assert!(
            fragment_length <= self.length(),
            "length of a fragment cannot exceed {}, but was {}",
            self.length(),
            fragment_length
        );
        assert!(
            fragment_length.is_power_of_two(),
            "fragment length must be a power of 2"
        );
        let num_fragments = self.length() / fragment_length;

        let mut fragment_data = (0..num_fragments).map(|_| Vec::new()).collect::<Vec<_>>();
        self.trace.columns_mut().for_each(|column| {
            for (i, fragment) in column.chunks_mut(fragment_length).enumerate() {
                fragment_data[i].push(fragment);
            }
        });

        fragment_data
            .into_iter()
            .enumerate()
            .map(|(i, data)| TraceTableFragment {
                index: i,
                offset: i * fragment_length,
                data,
            })
            .collect()
    }