Function lower_with_reader 

pub fn lower_with_reader(
    src: &str,
    file: &Path,
    reader: &dyn ResourceReader,
) -> LowerResult

Parse, lower and resolve source using supplied external resource reads.

No filesystem reads occur unless reader performs them. Paths retain the same source-relative resolution and portability checks as lower. Each resolved path, including failures, is captured once in LowerResult::resources.

Examples

use std::{io, path::Path};
use mos_eval::{ResourceData, lower_with_reader};

let reader = |path: &Path| {
    if path == Path::new("project/refs.bib") {
        Ok(ResourceData::new(b"@book{key, title={In memory}}".as_slice()))
    } else {
        Err(io::Error::from(io::ErrorKind::NotFound))
    }
};
let result = lower_with_reader(
    "#bibliography(\"refs.bib\")\nSee [@key]\n",
    Path::new("project/main.mos"),
    &reader,
);
assert!(!result.has_errors());
assert!(result.bibliography_complete);
assert!(result.resources.get(Path::new("project/refs.bib")).is_some());