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mod build;
mod lex;
mod split;
mod util;

pub use build::build;
pub use lex::distribute_lex as lex;
pub use split::split;
use std::rc::Rc;
pub use util::*;

pub fn parse(src: &str) -> Vec<Result<Rc<Expr>, ParseErr>> {
    let symbols = split(src);
    if let Err(e) = symbols {
        return vec![Err(e)];
    }
    let tokens = lex(&symbols.unwrap());
    if let Err(e) = tokens {
        return vec![Err(e)];
    }
    build(&tokens.unwrap())
}

#[cfg(test)]
#[cfg_attr(tarpaulin, skip)]
mod integrate {
    const ASSETS: [&str; 9] = [
        "sort",
        "set-construct",
        "word-count",
        "printer",
        "interprete",
        "unification",
        "timer",
        "sprintf",
        "matrix",
    ];
    use super::*;
    use crate::source;

    #[test]
    fn read_sources() {
        for file in ASSETS.iter() {
            let prog = source(&("assets/".to_owned() + *file)).unwrap();
            let symbols = split(&prog[..]);
            if let Err(e) = symbols {
                panic!("Could not split {} properly: {:?}", file, e);
            }
            let symbols = symbols.ok().unwrap();
            let tokens = lex(&symbols);
            if let Err(e) = tokens {
                panic!("Could not tokenize {} properly: {:?}", file, e);
            }
            let tokens = tokens.ok().unwrap();
            let exprs = build(&tokens);
            for expr in exprs.iter() {
                if let Err(e) = expr {
                    match e {
                        ParseErr::MismatchedOpenBrace(n)
                        | ParseErr::MismatchedOpenParen(n)
                        | ParseErr::MismatchedCloseBrace(n)
                        | ParseErr::MismatchedCloseParen(n) => panic!(
                            "Could not build {} properly: {:?}\nContext: {:?}",
                            file,
                            e,
                            &tokens[n - 5..n + 5]
                        ),
                        e => panic!("Could not build {} properly: {:?}", file, e),
                    }
                }
            }
        }
    }

    #[test]
    fn failures() {
        assert_eq!(
            *parse("(")[0].as_ref().err().unwrap(),
            ParseErr::MismatchedOpenParen(0)
        );
        assert_eq!(
            *parse("#")[0].as_ref().err().unwrap(),
            ParseErr::LoneNumbersign
        );
        assert_eq!(source("nofile"), None);
        assert_eq!(
            *parse("abc |# x")[0].as_ref().err().unwrap(),
            ParseErr::NoCommentStart
        );
        assert_eq!(
            *parse("x #| abc")[0].as_ref().err().unwrap(),
            ParseErr::UnterminatedComment
        );
        assert_eq!(
            *parse("\"abc")[0].as_ref().err().unwrap(),
            ParseErr::UnterminatedString(1)
        );
    }
}