0.5.0

This release fixes a few bugs in the structure of the module import and export nodes. This also introduces a spanned module which requires the user to provide a human friendly start and end position for each element of each node. For example, an empty object literal would now be defined as below.

Expr::Obj(ObjExpr {
    open_brace: Slice {
        source: Cow::Borrowed("{"),
        loc: SourceLocation {
            start: Position { line: 1, column: 1 },
            end: Position { line: 1, column: 2 },
        },
    },
    props: Vec::new(),
    close_brace: Slice {
        source: Cow::Borrowed("}"),
        loc: SourceLocation {
            start: Position { line: 1, column: 2 },
            end: Position { line: 1, column: 3 },
        },
    },
});

While that is pretty verbose, it provides all of the context needed for performing things like source maps with 100% accuracy.

This release also introduces the Node trait which has 2 methods, loc which will provide the SourceLocation and also source for accessing the string slice for that node. Using the above Expr we can see how this can see how this could be useful.

let obj = Expr::Obj(/*see above*/);
let full_loc = obj.loc();
assert_eq!(full_loc.start.line, 1);
assert_eq!(full_loc.start.column, 1);
assert_eq!(full_loc.end.line, 1);
assert_eq!(full_loc.end.column, 2);
if let Expr::Obj(inner) = &obj {
    let start_loc = inner.open_brace.loc();
    assert_eq!(start_loc.start, full_loc.start);
    let end_loc = inner.close_brace.loc();
    assert_eq!(end_loc.end, full_loc.end);
}