pub mod declaration;
pub mod error;
pub mod expression;
mod literals;
pub mod module;
pub mod proc;
pub mod tokens;

use nom::{
    branch::alt,
    bytes::complete::tag,
    character::complete::{alpha1, alphanumeric1, multispace0},
    combinator::{map, opt, recognize},
    error::{ErrorKind, ParseError},
    multi::{many0, separated_list0},
    sequence::{delimited, pair, preceded, separated_pair, tuple},
};
use nom_greedyerror::GreedyError;
use nom_locate::LocatedSpan;

// custom span type for nom_locate
pub type Span<'a> = LocatedSpan<&'a str>;

pub type IErr<I> = GreedyError<I, ErrorKind>;
// custom IResult type for VerboseError
pub type IResult<I, O, E = IErr<I>> = nom::IResult<I, O, E>;

pub use crate::parser::declaration::{
    assign_statement, declaration, typename, Assign, NetDecl, TypeName,
};
pub use crate::parser::expression::{expression, Call, Expression, Operation};
pub use crate::parser::module::{module, Module, ModuleItem, PortDirection};
use crate::parser::tokens::{token, TokenKind as tk, TokenSpan};

pub fn parse(input: TokenSpan) -> IResult<TokenSpan, Module> {
    module(input)
}

#[cfg(test)]
mod test {
    use super::*;
    use nom::combinator::all_consuming;

    #[test]
    fn test_operation() {
        operation(" a | b ".into()).unwrap();
        operation(" a & b ".into()).unwrap();
    }

    #[test]
    fn test_expression() {
        expression(" a ".into()).unwrap();
        expression(" a | b ".into()).unwrap();
        expression(" a | b | c ".into()).unwrap();
    }

    #[test]
    fn test_assignment() {
        // TODO: make wrapper and use for all tests
        all_consuming(assign_statement)(" a = b ".into()).unwrap();
        all_consuming(assign_statement)(" a = b | c ".into()).unwrap();
    }

    #[test]
    fn test_call() {
        call_item("thing ( )".into()).unwrap();
        call_item("thing ( a , b , c )".into()).unwrap();
        call_item("thing(a,b,c)".into()).unwrap();
    }
}