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#[macro_use]
extern crate error_chain;
extern crate lalrpop_util;
extern crate reproto_ast as ast;
extern crate reproto_path_lexer as path_lexer;

pub mod errors;
mod parser;

use self::errors::{ErrorKind, Result};
use ast::PathSpec;

pub fn parse(input: &str) -> Result<PathSpec> {
    use lalrpop_util::ParseError::*;
    use self::ErrorKind::*;
    use self::path_lexer::Error::*;

    let lexer = path_lexer::path_lex(input);

    match parser::parse_path(lexer) {
        Ok(file) => Ok(file),
        Err(e) => {
            match e {
                InvalidToken { location } => Err(Syntax(Some((location, location)), vec![]).into()),
                UnrecognizedToken { token, expected } => {
                    let pos = token.map(|(start, _, end)| (start, end));
                    Err(Syntax(pos, expected).into())
                }
                User { error } => {
                    match error {
                        Unexpected { pos } => {
                            return Err(Parse(Some((pos, pos)), "unexpected input").into());
                        }
                    }
                }
                _ => Err(Parse(None, "parse error").into()),
            }
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_basic_path() {
        let spec = parse("/foo\\//{bar}_baz\\{\\}").unwrap();
        println!("spec = {:?}", spec);
    }
}