src/main.rs


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mod ast;
mod checker;
mod checker_set;
mod checker_signature;
mod checker_state;
mod parser;

use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
use tracing_tree::HierarchicalLayer;

fn main() {
    tracing_subscriber::registry()
        .with(
            HierarchicalLayer::new(2)
                .with_targets(false)
                .with_bracketed_fields(true),
        )
        .init();

    let src = r#"

// let X be the set Y, call it Z
let set X = record { .b : Bool, .n : Nat }
let set Y = X
let set Z = record { .y : Y }
// make some elements
let element x : X = { .b = true, .n = 41 }
let element z : Z = { .y = x }
// exercise case matching
let set Z_or_Float = variant [ z. : Z | f. : Float ]
let element injected : Z_or_Float = z. z
let element check_cases : Nat = case injected of [ z. myz => myz .y .n | f. myf => 2 ]

let signature Graph = theory {
    .Node :: Set,
    .Edge :: (s : Node) (t : Node) -> Set
}

// let instance natPoset :: Graph = {
//     .Node = Nat,
//     .Edge = for (s : Nat) (t : Nat), Bool
// }
//
// let element node : set-of(natPoset .Node) = 7
//
// let set NatEdges = record {
//   .source: set-of(natPoset .Node),
//   .target: set-of(natPoset .Node),
//   .connected set-of(natPoset .Edge source target)
// }
"#;
    let programme = parser::parser::program(src);

    assert!(programme.is_ok());
    let programme = programme.unwrap();
    println!("Parsed:\n```\n{}\n```\n", programme);

    if let Err(e) = programme.check() {
        println!("{}", e);
    }
}