pub struct ReadBuffer {
    pub bytes: Vec<u8>,
    pub pointer: usize,
}

impl ReadBuffer {
    pub fn new() -> Self {
        Self {
            bytes: Vec::new(),
            pointer: 0,
        }
    }

    pub fn from_str(text: &str) -> Self {
        Self {
            bytes: text.bytes().collect(),
            pointer: 0,
        }
    }

    pub fn set_str(&mut self, text: &str) {
        self.bytes = text.bytes().collect();
        self.pointer = 0;
    }

    pub fn read(&mut self) -> u8 {
        let pointer = self.pointer;
        self.pointer += 1;
        match self.bytes.get(pointer) {
            Some(byte) => *byte,
            None => 0,
        }
    }
}