frameassembly 1.0.0

A Domain-Specific Language (DSL) for writing deterministic network traffic to .pcap files.
Documentation 
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//! PIM Layer 3 multicast routing protocol field parser.

use winnow::ModalResult as PResult;
use winnow::combinator::{alt, cut_err};
use winnow::prelude::*;

use crate::ast::*;
use crate::lexer::Token;
use crate::parser::{parse_ip, parse_u16, parse_u32, tag, ParsedField, Stream};

/// Parses a PIM protocol declaration or routing field.
pub(crate) fn parse_pim_field<'i, 'a>(input: &mut Stream<'i, 'a>) -> PResult<ParsedField<'a>> {
    alt((
        alt((
            tag(Token::Pim).map(|(_, s)| ParsedField::Protocol(Protocol::Pim, (s.start, s.len()))),
            tag(Token::Hello).map(|(_, s)| ParsedField::HelloWord((s.start, s.len()))),
            tag(Token::JoinPrune).map(|(_, s)| ParsedField::PimJoinPrune((s.start, s.len()))),
            tag(Token::Register).map(|(_, s)| ParsedField::PimRegister((s.start, s.len()))),
            (tag(Token::Group), parse_ip).map(|((_, s), v)| ParsedField::GroupVal(Some(v), None, (s.start, s.end - s.start))),
        )),
        alt((
            (tag(Token::Source), cut_err(parse_ip)).map(|((_, s), v)| ParsedField::SourceIp(v, (s.start, s.end - s.start))),
            (tag(Token::Rp), cut_err(parse_ip)).map(|((_, s), v)| ParsedField::Rp(v, (s.start, s.end - s.start))),
            (tag(Token::HoldTime), cut_err(parse_u16)).map(|((_, s), v)| ParsedField::HoldTime(v, (s.start, s.end - s.start))),
            (tag(Token::DrPriority), cut_err(parse_u32)).map(|((_, s), v)| ParsedField::DrPriority(v, (s.start, s.end - s.start))),
        )),
    ))
    .parse_next(input)
}