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use crate::{
instruction::Instruction,
error::BrainfuckError,
};
use std::string::ToString;
use std::fmt;
use std::fmt::Debug;
pub const MEMORY_SIZE: usize = 30_000;
#[derive(Debug)]
pub struct Tape {
stream: Vec<Instruction>,
ptr: usize,
} impl Tape {
pub fn new(mut stream: Vec<Instruction>) -> Self {
if !stream.ends_with(&[Instruction::EOF]) {
stream.push(Instruction::EOF);
}
Tape {
stream,
ptr: 0usize,
}
}
pub fn from_string<S: ToString>(s: S) -> Self {
let mut stream: Vec<Instruction> = s.to_string()
.chars()
.map(|c| Instruction::from_char(c))
.collect();
if !stream.ends_with(&[Instruction::EOF]) {
stream.push(Instruction::EOF);
}
Self::new(stream)
}
pub fn get_instruction(&mut self) -> Instruction {
self.ptr += 1;
self.stream[self.ptr - 1]
}
pub fn jump_back(&mut self) -> Result<(), BrainfuckError> {
self.ptr -= 1;
let mut depth = 0;
while self.ptr != 0 {
match self.stream.get(self.ptr) {
Some(Instruction::SetJump) => { depth -= 1; },
Some(Instruction::Jump) => { depth += 1; },
_ => (),
};
if depth == 0 {
return Ok(())
} else {
self.ptr -= 1;
}
}
Err(BrainfuckError::new("Mismatched jump operations (missing a `[`)"))
}
pub fn jump_forward(&mut self) -> Result<(), BrainfuckError> {
let mut depth = 1;
while self.ptr != self.stream.len() {
match self.stream.get(self.ptr) {
Some(Instruction::SetJump) => { depth += 1; },
Some(Instruction::Jump) => { depth -= 1; },
_ => ()
};
if depth == 0 {
return Ok(());
} else {
self.ptr += 1;
}
}
Err(BrainfuckError::new("Mismatched jump operations (missing a `]`)"))
}
} impl Default for Tape {
fn default() -> Self {
Self::new(Vec::new())
}
}
pub struct Memory {
bytes: [u8; MEMORY_SIZE],
ptr: usize,
} impl Memory {
pub fn new() -> Self {
let bytes = [0u8; MEMORY_SIZE];
Memory {
bytes,
ptr: 0usize
}
}
pub fn pull(&self) -> u8 {
self.bytes[self.ptr]
}
pub fn push(&mut self, value: u8) {
self.bytes[self.ptr] = value;
}
pub fn inc_ptr(&mut self) -> Result<(), BrainfuckError> {
if self.ptr == MEMORY_SIZE - 1 {
Err(BrainfuckError::new("Attempt to increment data pointer past the end of memory"))
} else {
self.ptr += 1;
Ok(())
}
}
pub fn dec_ptr(&mut self) {
if self.ptr != 0 {
self.ptr -= 1;
}
}
pub fn inc_val(&mut self) {
self.bytes[self.ptr] = self.bytes[self.ptr].wrapping_add(1);
}
pub fn dec_val(&mut self) {
self.bytes[self.ptr] = self.bytes[self.ptr].wrapping_sub(1);
}
} impl Debug for Memory {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "Memory {{\n\tbytes: {:?},\n\tptr: {}\n}}", self.bytes.iter().map(|v| *v).collect::<Vec<u8>>(), self.ptr)
}
}
#[derive(Debug)]
pub struct IO {
input: Vec<u8>,
output: Vec<u8>,
} impl IO {
pub fn new(input: Vec<u8>) -> Self {
IO {
input,
output: Vec::new(),
}
}
pub fn write_to(&mut self, memory: &mut Memory) {
if self.input.len() != 0 {
memory.push(self.input.remove(0));
}
}
pub fn pull_from(&mut self, memory: &mut Memory) {
self.output.push(memory.pull());
}
pub fn output(&self) -> Vec<u8> {
self.output.clone()
}
} impl Default for IO {
fn default() -> Self {
Self::new(Vec::new())
}
}