sysml-v2-parser 0.3.1

SysML v2 textual notation parser for Rust
Documentation 
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//! Metadata definition parsing (BNF MetadataDefinition).

use crate::ast::{DefinitionBody, MetadataDef, Node};
use crate::parser::lex::{
    identification, skip_until_brace_end, take_until_terminator, ws1, ws_and_comments,
};
use crate::parser::node_from_to;
use crate::parser::Input;
use nom::branch::alt;
use nom::bytes::complete::tag;
use nom::combinator::{map, opt};
use nom::sequence::preceded;
use nom::IResult;
use nom::Parser;

fn definition_body(input: Input<'_>) -> IResult<Input<'_>, DefinitionBody> {
    let (input, _) = ws_and_comments(input)?;
    alt((
        map(tag(&b";"[..]), |_| DefinitionBody::Semicolon),
        map(
            nom::sequence::delimited(
                tag(&b"{"[..]),
                skip_until_brace_end,
                preceded(ws_and_comments, tag(&b"}"[..])),
            ),
            |_| DefinitionBody::Brace,
        ),
    ))
    .parse(input)
}

/// Metadata definition: `metadata def` Identification body (optional `abstract` prefix).
pub(crate) fn metadata_def(input: Input<'_>) -> IResult<Input<'_>, Node<MetadataDef>> {
    let start = input;
    let (input, _) = ws_and_comments(input)?;
    let (input, is_abstract) = opt(preceded(tag(&b"abstract"[..]), ws1))
        .parse(input)
        .map(|(i, o)| (i, o.is_some()))?;
    let (input, _) = tag(&b"metadata"[..]).parse(input)?;
    let (input, _) = ws1(input)?;
    let (input, _) = tag(&b"def"[..]).parse(input)?;
    let (input, _) = ws1(input)?;
    let (input, identification) = identification(input)?;
    let (input, _) = ws_and_comments(input)?;
    let (input, _) = take_until_terminator(input, b";{")?;
    let (input, body) = definition_body(input)?;
    Ok((
        input,
        node_from_to(
            start,
            input,
            MetadataDef {
                is_abstract,
                identification,
                body,
            },
        ),
    ))
}