frameassembly 1.0.1

A Domain-Specific Language (DSL) for writing deterministic network traffic to .pcap files.
Documentation 
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//! OPC UA Layer 7 industrial architecture 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 an OPC UA protocol declaration or secure channel field.
pub(crate) fn parse_opcua_field<'i, 'a>(input: &mut Stream<'i, 'a>) -> PResult<ParsedField<'a>> {
    alt((
        alt((
            tag(Token::Opcua).map(|(_, s)| ParsedField::Protocol(Protocol::Opcua, (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::ChunkType), cut_err(parse_str_val)).map(|((_, s), v)| ParsedField::L7StringField("CHUNK_TYPE", v, (s.start, s.end - s.start))),
            (tag(Token::SecureChannelId), cut_err(parse_u32)).map(|((_, s), v)| ParsedField::L7U32Field("SECURE_CHANNEL_ID", v, (s.start, s.end - s.start))),
            (tag(Token::TokenId), cut_err(parse_u32)).map(|((_, s), v)| ParsedField::L7U32Field("TOKEN_ID", v, (s.start, s.end - s.start))),
        )),
        alt((
            (tag(Token::SeqNum), cut_err(parse_u32)).map(|((_, s), v)| ParsedField::L7U32Field("SEQ_NUM", v, (s.start, s.end - s.start))),
            (tag(Token::ReqId), cut_err(parse_u32)).map(|((_, s), v)| ParsedField::L7U32Field("REQ_ID", v, (s.start, s.end - s.start))),
            (tag(Token::EndpointUrl), cut_err(parse_str_val)).map(|((_, s), v)| ParsedField::L7StringField("ENDPOINT_URL", v, (s.start, s.end - s.start))),
            (tag(Token::NodeId), cut_err(parse_str_val)).map(|((_, s), v)| ParsedField::L7StringField("NODE_ID", v, (s.start, s.end - s.start))),
        )),
    ))
    .parse_next(input)
}