frameassembly 1.0.0

A Domain-Specific Language (DSL) for writing deterministic network traffic to .pcap files.
Documentation 
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//! PTP Layer 7 precision time 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_str_val, parse_u32, tag, ParsedField, Stream};

/// Parses a PTP protocol declaration or timestamp field.
pub(crate) fn parse_ptp_field<'i, 'a>(input: &mut Stream<'i, 'a>) -> PResult<ParsedField<'a>> {
    alt((
        alt((
            tag(Token::Ptp).map(|(_, s)| ParsedField::Protocol(Protocol::Ptp, (s.start, s.len()))),
            (tag(Token::MsgType), cut_err(parse_str_val)).map(|((_, s), v)| ParsedField::L7StringField("MSG_TYPE", v, (s.start, s.end - s.start))),
            tag(Token::Sync).map(|(_, s)| ParsedField::L7Flag("SYNC", (s.start, s.len()))),
            tag(Token::DelayReq).map(|(_, s)| ParsedField::L7Flag("DELAY_REQ", (s.start, s.len()))),
            tag(Token::FollowUp).map(|(_, s)| ParsedField::L7Flag("FOLLOW_UP", (s.start, s.len()))),
        )),
        alt((
            tag(Token::DelayResp).map(|(_, s)| ParsedField::L7Flag("DELAY_RESP", (s.start, s.len()))),
            tag(Token::Announce).map(|(_, s)| ParsedField::L7Flag("ANNOUNCE", (s.start, s.len()))),
            (tag(Token::Domain), parse_u32).map(|((_, s), v)| ParsedField::L7U32Field("DOMAIN", v, (s.start, s.end - s.start))),
            (tag(Token::SeqId), cut_err(parse_u32)).map(|((_, s), v)| ParsedField::L7U32Field("SEQ_ID", v, (s.start, s.end - s.start))),
            (tag(Token::ClockId), cut_err(parse_str_val)).map(|((_, s), v)| ParsedField::L7StringField("CLOCK_ID", v, (s.start, s.end - s.start))),
        )),
    ))
    .parse_next(input)
}