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#![allow(dead_code)]
use std::fmt;

#[derive(Copy, Clone)]
pub struct Range(isize, isize);

const INVALID_INDEX: isize = -1;

#[inline]
pub fn new() -> Range {
    Range(INVALID_INDEX, INVALID_INDEX)
}

#[inline]
pub fn with_start(pos: isize) -> Range {
    Range(pos, pos)
}

#[inline]
pub fn with_start_end(start: isize, end: isize) -> Range {
    Range(start, end)
}


impl Range {
    pub fn below(&self, pos: isize) -> bool {
        return (self.0 - 1) == pos;
    }

    pub fn start_pos(&mut self, pos: isize) {
        self.0 = pos;
    }

    #[inline]
    pub fn start(&self) -> isize {
        self.0
    }

    #[inline]
    pub fn end(&self) -> isize {
        self.1
    }

}

impl fmt::Display for Range {
    fn fmt(&self, f: &mut fmt::Formatter ) -> fmt::Result {
        let mut buffer = "".to_string();
        if self.0 != INVALID_INDEX {
            buffer.push_str(&format!("{:3}", self.0 + 1));
            if self.1 != INVALID_INDEX {
                if self.1 != self.0 {
                    buffer.push_str(&format!(",{:<3}", self.1 + 1));
                }
                else {
                    buffer.push_str(&format!(",{:<3}", "-"));
                }
            }
        }
        write!(f, "({})", buffer)
    }
}