nom-derive

Overview

nom-derive is a custom derive attribute, to derive [nom] parsers automatically from the structure definition.

• API documentation

This is only test code for now. Feedback welcome !

#[derive(Nom)]

This crate exposes a single custom-derive macro Nom which implements parse for the struct it is applied to.

The goal of this project is that:

• derive(Nom) should be enough for you to derive [nom] parsers for simple structures easily, without having to write it manually
• it allows overriding any parsing method by your own
• it allows using generated parsing functions along with handwritten parsers and combining them without efforts

Usage

Add to your Cargo.toml file::

nom-derive = "0.2" nom = "4.2"

Add #[derive(Nom)] to the structure(s) you want.

See the tests directory for examples.

Example

This implementation:

```rust

[macro_use]

extern crate nom_derive;

[macro_use]

extern crate nom;

use nom::*;

[derive(Nom)]

struct SimpleStruct { pub a: u32, b: u64, } ```

Allows you to generate the [nom] parser for SimpleStruct automatically. The function is called SimpleStruct::parse.

The generated code is equivalent to::

rust impl SimpleStruct { fn parse(i: &[u8]) -> IResult<&[u8],SimpleStruct> { do_parse!( i, a: be_u32 >> b: be_u64 >> ( SimpleStruct{ a,b } ) ) } }

Limitations

• Debugging macros is hard. Debugging macros generated by a custom derive is a nightmare. The expand cargo subcommand can help !

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.