frameassembly 1.0.0

A Domain-Specific Language (DSL) for writing deterministic network traffic to .pcap files.
Documentation 
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//! Link Layer Discovery Protocol (LLDP) 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_u16, tag, ParsedField, Stream};

/// Parses an LLDP protocol declaration or TLV field.
pub(crate) fn parse_lldp_field<'i, 'a>(input: &mut Stream<'i, 'a>) -> PResult<ParsedField<'a>> {
    alt((
        tag(Token::Lldp).map(|(_, s)| ParsedField::Protocol(Protocol::Lldp, (s.start, s.len()))),
        (tag(Token::ChassisId), cut_err(parse_str_val)).map(|((_, s), v)| ParsedField::ChassisId(v, (s.start, s.end - s.start))),
        (tag(Token::SysName), cut_err(parse_str_val)).map(|((_, s), v)| ParsedField::SysName(v, (s.start, s.end - s.start))),
        (tag(Token::SysDesc), cut_err(parse_str_val)).map(|((_, s), v)| ParsedField::SysDesc(v, (s.start, s.end - s.start))),
        (tag(Token::PortId), cut_err(alt((parse_u16.map(|p| (None, Some(p))), parse_str_val.map(|s| (Some(s), None)))))).map(|((_, s), (ps, pu))| ParsedField::PortIdVal(ps, pu, (s.start, s.end - s.start))),
    ))
    .parse_next(input)
}