subsetter 0.2.3

Reduces the size and coverage of OpenType fonts.
Documentation 
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use crate::write::{Writeable, Writer};
use std::fmt::{Display, Formatter};

pub const TWO_BYTE_OPERATOR_MARK: u8 = 12;

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum OperatorType {
    OneByteOperator([u8; 1]),
    TwoByteOperator([u8; 2]),
}

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct Operator(pub OperatorType);

impl Display for Operator {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        match self.0 {
            OperatorType::OneByteOperator(b) => write!(f, "{}", b[0]),
            OperatorType::TwoByteOperator(b) => write!(f, "{}{}", b[0], b[1]),
        }
    }
}

impl Writeable for Operator {
    fn write(&self, w: &mut Writer) {
        match &self.0 {
            OperatorType::OneByteOperator(b) => w.write(b),
            OperatorType::TwoByteOperator(b) => w.write(b),
        }
    }
}

impl Operator {
    pub const fn from_one_byte(b: u8) -> Self {
        Self(OperatorType::OneByteOperator([b]))
    }

    pub const fn from_two_byte(b: u8) -> Self {
        Self(OperatorType::TwoByteOperator([TWO_BYTE_OPERATOR_MARK, b]))
    }
}