uindex 0.1.1

Universal index
Documentation 
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// Copyright (c) 2020 by Enrique Pérez Arnaud <enrique at cazalla.net>
//
// This file is part of the modus_ponens project.
// http://www.modus_ponens.net
//
// The modus_ponens project is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The modus_ponens project is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with any part of the modus_ponens project.
// If not, see <http://www.gnu.org/licenses/>.

use std::{cell::RefCell, collections::HashMap, mem};

use crate::segment::MPSegment;

pub struct Lexicon {
    segments: RefCell<HashMap<u64, Box<MPSegment>>>,
}

impl Lexicon {
    pub fn new() -> Self {
        Lexicon {
            segments: RefCell::new(HashMap::new()),
        }
    }
    pub fn intern_with_name(
        &self,
        name: u64,
        text: &str,
        key: u64,
        is_leaf: bool,
        is_var: bool,
        in_var_range: bool,
        is_empty: bool,
        unique: bool,
    ) -> &MPSegment {
        let mut map = self.segments.borrow_mut();

        if !map.contains_key(&key) {
            let segment = MPSegment::new(
                name,
                text.to_string(),
                is_leaf,
                is_var,
                in_var_range,
                is_empty,
                unique,
            );
            map.insert(key, Box::new(segment));
        }

        let interned = map.get(&key).unwrap();

        unsafe { mem::transmute(interned.as_ref()) }
    }
}