Method c_utf8_seq_

regex/src/compile.rs:890–926

(&mut self, seq: I)

    }

    fn c_utf8_seq_<'r, I>(&mut self, seq: I) -> Result
            where I: IntoIterator<Item=&'r Utf8Range> {
        // The initial instruction for each UTF-8 sequence should be the same.
        let mut from_inst = ::std::usize::MAX;
        let mut last_hole = Hole::None;
        for byte_range in seq {
            let key = SuffixCacheKey {
                from_inst: from_inst,
                start: byte_range.start,
                end: byte_range.end,
            };
            {
                let pc = self.c.insts.len();
                if let Some(cached_pc) = self.c.suffix_cache.get(key, pc) {
                    from_inst = cached_pc;
                    continue;
                }
            }
            self.c.byte_classes.set_range(byte_range.start, byte_range.end);
            if from_inst == ::std::usize::MAX {
                last_hole = self.c.push_hole(InstHole::Bytes {
                    start: byte_range.start,
                    end: byte_range.end,
                });
            } else {
                self.c.push_compiled(Inst::Bytes(InstBytes {
                    goto: from_inst,
                    start: byte_range.start,
                    end: byte_range.end,
                }));
            }
            from_inst = self.c.insts.len().checked_sub(1).unwrap();
            debug_assert!(from_inst < ::std::usize::MAX);
        }
        debug_assert!(from_inst < ::std::usize::MAX);
        Ok(Patch { hole: last_hole, entry: from_inst })
    }
}

/// `SuffixCache` is a simple bounded hash map for caching suffix entries in