Macro bitpattern::bitpattern

bitpattern!() { /* proc-macro */ }

bitwise pattern matching and extracting.

Example

 use bitpattern::bitpattern;

 let x = 0xacu8; // 10101100

 // '0' means the bit must be 0.
 // '1' means the bit must be 1.
 // '_' can be uses as separator.
 assert_eq!(bitpattern!("1010_1100", x), Some(()));
 assert_eq!(bitpattern!("1010_0100", x), None);

 // '?' means the bit can be 0 or 1.
 assert_eq!(bitpattern!("1?10_1?00", x), Some(()));

 // Other charactors can be used for extracting.
 // 'a' extracts a single bit.
 assert_eq!(bitpattern!("1a10_1100", x), Some(0));
 assert_eq!(bitpattern!("10a0_1100", x), Some(1));

 // Multi-bit extracting by continuous charactors.
 assert_eq!(bitpattern!("1aaa_a100", x), Some(5));

 // Multiple extracting.
 assert_eq!(bitpattern!("1aa0_aa00", x), Some((1, 3)));

 // If the extracting fields are adjacent, the different charactors can be used.
 assert_eq!(bitpattern!("1aab_bccc", x), Some((1, 1, 4)));