// vim: ft=rust
use ast::*;
use path_lexer::{self, PathToken};
use std::borrow::Cow;

grammar<'input>();

pub Path: PathSpec<'input> = {
    "/" =>
    PathSpec {
        steps: vec![],
    },
    <steps:Step*> =>
    PathSpec {
        steps: steps,
    },
};

Step: PathStep<'input> =
    "/" <parts:Part+> =>
    PathStep {
        parts: parts,
    };

Part: PathPart<'input> = {
    "{" <variable:ident> "}" => PathPart::Variable(variable),
    <segment:segment> => PathPart::Segment(segment),
};

extern {
    type Location = usize;
    type Error = path_lexer::Error;

    enum PathToken<'input> {
        "/" => PathToken::Slash,
        "{" => PathToken::LeftCurly,
        "}" => PathToken::RightCurly,
        ident => PathToken::Identifier(<Cow<'input, str>>),
        segment => PathToken::Segment(<String>),
    }
}