sfparse-rs

A #![no_std], high-performance parser for HTTP Structured Field Values (RFC 8941 / RFC 9651).

Designed for zero-copy and zero-allocation operation, sfparse-rs parses input data in-place without allocating dynamic data structures (such as maps, lists, or strings). It provides minimal, stream-oriented parsing primitives suitable for memory-constrained environments and high-throughput network applications.

It is the port of sfparse written in C.

This is an example of parsing RFC 9218 Priority header field:

use sfparse::{Parser, Value};

let mut urgency :i32 = 3;
let mut incremental = false;
let mut p = Parser::new("u=2, i".as_bytes());

loop {
    match p.parse_dict().unwrap() {
        None => break,
        Some(("u", Value::Integer(v))) if (0i64..=7i64).contains(&v) => urgency = v as i32,
        Some(("i", Value::Bool(v))) => incremental = v,
        _ => (),
    }
}

println!("urgency={urgency} incremental={incremental}");

The MIT License

Copyright (c) 2024 sfparse-rs contributors