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use std::{
path::{Path, PathBuf},
io::Read,
fs::File,
rc::Rc,
};
// TODO: make path optional
/// `Source` represents some literal source code.
/// Whether a repl session, a file on disk, or some library code.
/// It's essentially a string with a path, the path serving as the source's name.
/// Source files without a path point to `./source`,
/// though this behaviour might change in the future.
#[derive(Debug, PartialEq, Eq)]
pub struct Source {
pub contents: String,
pub path: PathBuf,
}
impl Source {
/// Creates a new `Source` given both an `&str` and a `PathBuf`.
/// Note that this function does not check that the contents of the file
/// match the source.
/// `Source::path` or `Source::source` should be used instead.
pub fn new(source: &str, path: &Path) -> Rc<Source> {
Rc::new(Source { contents: source.to_string(), path: path.to_owned() })
}
/// Build a `Source` from a path.
/// This will read a file to create a new source.
pub fn path(path: &Path) -> std::io::Result<Rc<Source>> {
let mut source = String::new();
let mut file = File::open(path)?;
file.read_to_string(&mut source)?;
Ok(Source::new(&source, path))
}
/// Build an empty `Source` containing just a string.
/// Note that this source will point towards `./source`.
pub fn source(source: &str) -> Rc<Source> {
Source::new(&source.to_string(), &PathBuf::from("./source"))
}
}