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//! Executor engine implementation for Brainfuck interpreter.
//!
//! This predominantly allows implementation of a [`u16`] executor.
use std::io::Read;
use crate::executor::{Error, Executor};
/// Generic engine implementation for the Brainfuck interpreter.
pub trait Engine<T> {
/// Read one byte from stdin.
///
/// # Errors
///
/// This function will return an error if it is unable to read from stdin,
/// or if it indexes out of bounds.
fn read_byte() -> Result<T, Error>;
/// Write the provided byte to stdout.
///
/// # Errors
///
/// This function will return an error if it is unable to write a byte to
/// stdout.
fn write_byte(byte: T) -> Result<(), Error>;
}
impl Engine<u8> for Executor {
fn read_byte() -> Result<u8, Error> {
let mut input: [u8; 1] = [0; 1];
std::io::stdin().read_exact(&mut input)?;
Ok(input[0])
}
fn write_byte(byte: u8) -> Result<(), Error> {
print!("{}", char::from(byte));
Ok(())
}
}
impl Engine<u16> for Executor {
fn read_byte() -> Result<u16, Error> {
let mut input: [u8; 2] = [0; 2];
std::io::stdin().read_exact(&mut input)?;
let number = ((u16::from(input[0])) << 8i32) | u16::from(input[1]);
Ok(number)
}
fn write_byte(byte: u16) -> Result<(), Error> {
print!("{}", String::from_utf16_lossy(&[byte]));
Ok(())
}
}
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