fn parse_rustc_z_ls()

in src/compiler/rust.rs [2572:2631]

• 51 lines of code
• 8 McCabe index (conditional complexity)

fn parse_rustc_z_ls(stdout: &str) -> Result<Vec<&str>> {
    let mut lines = stdout.lines();
    loop {
        match lines.next() {
            Some("=External Dependencies=") => break,
            Some(_s) => {}
            None => bail!("No output from rustc -Z ls"),
        }
    }

    let mut dep_names = vec![];

    for line in &mut lines {
        if line.is_empty() {
            break;
        }

        let mut line_splits = line.splitn(2, ' ');
        let num: usize = line_splits
            .next()
            .expect("Zero strings from line split")
            .parse()
            .context("Could not parse number from rustc -Z ls")?;
        let libstring = line_splits
            .next()
            .context("No lib string on line from rustc -Z ls")?;
        if num != dep_names.len() + 1 {
            bail!(
                "Unexpected numbering of {} in rustc -Z ls output",
                libstring
            )
        }
        assert!(line_splits.next().is_none());

        let mut libstring_splits = libstring.rsplitn(2, '-');
        // Most things get printed as ${LIBNAME}-${HASH} but for some things
        // (native code-only libraries?), ${LIBNAME} is all you get.
        let libname = {
            let maybe_hash = libstring_splits
                .next()
                .context("Nothing in lib string from `rustc -Z ls`")?;
            if let Some(name) = libstring_splits.next() {
                name
            } else {
                maybe_hash
            }
        };
        assert!(libstring_splits.next().is_none());

        dep_names.push(libname);
    }

    for line in lines {
        if !line.is_empty() {
            bail!("Trailing non-blank lines in rustc -Z ls output")
        }
    }

    Ok(dep_names)
}