bc-envelope-pattern 0.14.0

Pattern matcher for Gordian Envelope
Documentation 
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use crate::{
    Error, Pattern, Result,
    parse::{Token, utils},
};

pub(crate) fn parse_cbor(lexer: &mut logos::Lexer<Token>) -> Result<Pattern> {
    let mut lookahead = lexer.clone();
    match lookahead.next() {
        Some(Ok(Token::ParenOpen)) => {
            lexer.next();
            let src = lexer.remainder();
            let (pattern, consumed) = utils::parse_cbor_inner(src)?;
            lexer.bump(consumed);
            match lexer.next() {
                Some(Ok(Token::ParenClose)) => Ok(pattern),
                Some(Ok(t)) => {
                    Err(Error::UnexpectedToken(Box::new(t), lexer.span()))
                }
                Some(Err(e)) => Err(e),
                None => Err(Error::ExpectedCloseParen(lexer.span())),
            }
        }
        _ => Ok(Pattern::any_cbor()),
    }
}