moonbit-bits-patterns

What problem does it solve?

This skill addresses the challenge of extracting and validating bit-level fields from BytesView slices, enabling precise interpretation of packed data without manual bit-twiddling.

Core Features & Use Cases

• Explicit bit-width patterns: Use patterns with be/le suffixes to describe exact field sizes and endianness.
• Field binding and guards: Bind fields to locals, ignore unused bits, and implement validation guards.
• Compositional parsing: Slice Bytes to BytesView and chain parsers, returning (field, rest) for multi-step decoding of protocols or file formats.
• Use Case: Decode a packet header where [u1be(flag), u3be(type), u4be(code), ..] determine routing or validation.

Quick Start

Create a BytesView with a slice of the payload and pattern-match it using the syntax described above, e.g., match bytes[0:1] with [u1be(flag), u7be(..rest)] to extract a flag.