/// # Token Metadata
/// Data contained is:
/// * File that the token was parsed in
/// * Line that the token was parsed in
/// * Position of the *first character making up the token* in said line
#[derive(Debug)]
pub struct TokenMeta {
    file: String,
    line: u32,
    pos: u32,
}

#[derive(Debug)]
pub enum OpType {
    MUL,
    DIV,
    ADD,
    SUB,
    POW,
}

/// Bracket types, either OPEN or CLOSE.
#[derive(Debug)]
pub enum BrType {
    OPEN,
    CLOSE,
}

/// # Tokens
/// The tokens all contain [metadata](TokenMeta).
/// 1. `ID`: A number, parsed into 64 bit floating-point.
/// 1. `OBR`: An opening bracket (`(`).
/// 1. `CBR`: A closing bracket (`)`).
/// 1. `OP`: An operation. Containing an [Operation Type](OpType).
#[derive(Debug)]
pub enum Token {
    ID (TokenMeta, f64),
    OBR (TokenMeta),
    CBR (TokenMeta),
    OP (TokenMeta, OpType),
}