Crate p_arse[−][src]

Expand description

WARNING: Thorough documentation is one of the goals. However, at the moment it’s not near completion. This is an early version and many things may change in the near future. The documentation will be improved as the crate matures.

`( ㅅ )` the inelegant parser

p-arse is a PEG parser library. It provides Parser trait with methods corresponding to PEG parsers and some basic utils.

The main focus of this library is simple syntax, type safety and easy debugging. It attempts to follow the original PEG syntax as closely as possible. Speed and efficiency are secondary.

For now the library only contains tools for dealing with complete strings. It may be developed in the future to cover byte slices and incomplete input, although I’m not planning to do it at the moment.

Examples

FASTA parser:

use p_arse::{Parser, CharExt, any, eoi};

let nl = '\n';

let header_content = (nl.not_ahead(), any()).more();
let header_tag = ">";
let header = (header_tag, header_content, nl);

let sequence_char = ('A'.to('Z')).or('*').or('-');
let subsequence = sequence_char.more();
let sequence =
    (subsequence, (nl, subsequence).zore(), nl.opt());

let entry = (header, sequence);

let file = (entry.zore(), eoi());

assert!(file.p_arse(input).is_ok());

Example input:

>MCHU - Calmodulin - Human, rabbit, bovine, rat, and chicken
MADQLTEEQIAEFKEAFSLFDKDGDGTITTKELGTVMRSLGQNPTEAELQDMINEVDADGNGTID
FPEFLTMMARKMKDTDSEEEIREAFRVFDKDGNGYISAAELRHVMTNLGEKLTDEEVDEMIREA
DIDGDGQVNYEEFVQMMTAK*
>gi|5524211|gb|AAD44166.1| cytochrome b [Elephas maximus maximus]
LCLYTHIGRNIYYGSYLYSETWNTGIMLLLITMATAFMGYVLPWGQMSFWGATVITNLFSAIPYIGTNLV
EWIWGGFSVDKATLNRFFAFHFILPFTMVALAGVHLTFLHETGSNNPLGLTSDSDKIPFHPYYTIKDFLG
LLILILLLLLLALLSPDMLGDPDNHMPADPLNTPLHIKPEWYFLFAYAILRSVPNKLGGVLALFLSIVIL
GLMPFLHTSKHRSMMLRPLSQALFWTLTMDLLTLTWIGSQPVEYPYTIIGQMASILYFSIILAFLPIAGX
IENY