520 lines
18 KiB
Rust
520 lines
18 KiB
Rust
use crate::bf_interpreter::interpreter::Interpreter;
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use colored::Colorize;
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use std::io::Write;
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use console::{Term, Key};
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struct Repl {
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pub interpreter: Interpreter,
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term: Term,
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history: Vec<String>,
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loop_body: String,
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loop_depth: usize,
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}
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const PROMPT: &str = "bf-interpreter> ";
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const HISTORY_FILE: &str = "bf-interpreter-history.bfr";
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const COMMAND_PREFIX: &str = "!";
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impl Repl {
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pub fn new(interpreter: Interpreter) -> Repl {
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Repl {
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term: interpreter.term.clone(),
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interpreter,
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history: Vec::new(),
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loop_body: String::new(),
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loop_depth: 0,
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}
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}
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// #[no_panic]
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pub fn run(mut self) -> Result<(), std::io::Error> {
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loop {
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self.print_prompt();
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std::io::stdout().flush()?;
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match self.read_input() {
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Ok(input) => {
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let user_input = input.trim().to_string(); // Remove trailing newline
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if !user_input.is_empty() && user_input.len() > 0 {
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self.history.push(user_input.clone()); // Save input to history
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self.process(user_input); // Process the input
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}
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}
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Err(e) => {
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eprintln!("Error: {}", e);
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}
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}
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}
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}
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fn print_prompt(&self) {
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print!(
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"{}",
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if self.loop_depth != 0 {
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"........ ".yellow()
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} else {
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PROMPT.to_string().truecolor(54, 76, 76)
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}
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);
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}
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fn read_input(&mut self) -> Result<String, std::io::Error> {
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let mut input = String::new();
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let mut rev_index = 0;
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loop {
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let key = self.term.read_key()?; // Read key from terminal
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match key {
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Key::ArrowUp => {
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if !self.history.is_empty() && rev_index < self.history.len() {
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let last = self.history.get(self.history.len() - 1 - rev_index)
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.unwrap();
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rev_index += 1;
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self.term.clear_line()?;
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self.print_prompt();
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self.term.write_str(last)?;
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input = last.clone();
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}
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}
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Key::ArrowDown => {
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if !self.history.is_empty() && rev_index > 0 {
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let first = self.history.get(self.history.len() - rev_index)
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.unwrap();
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rev_index -= 1;
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self.term.clear_line()?;
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self.print_prompt();
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self.term.write_str(first)?;
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input = first.clone();
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}
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}
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Key::Char(c) => {
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self.term.write_str(&c.to_string())?;
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input.push(c);
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}
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Key::Backspace => {
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self.term.clear_line()?;
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self.term.write_str(&input[0..input.len() - 1])?;
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self.term.move_cursor_left(1)?;
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input.pop();
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}
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Key::Enter => {
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self.term.write_str("\n")?;
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break;
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}
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_ => {}
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}
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}
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Ok(input)
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}
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pub fn process(&mut self, mut user_input: String) {
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user_input.chars().for_each(|ch| {
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if ch == '[' {
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self.loop_depth += 1;
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} else if ch == ']' {
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self.loop_depth -= 1;
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}
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});
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match user_input.find('[') {
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Some(index) if self.loop_depth != 0 && self.loop_body.is_empty() => {
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self.loop_body.push_str(&user_input[index..]);
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user_input = user_input[..index].to_string();
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}
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Some(_) if !self.loop_body.is_empty() => {
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self.loop_body.push_str(&user_input);
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return;
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}
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_ => {
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if user_input.contains(']') {
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if self.loop_depth == 0 {
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self.loop_body.push_str(&user_input);
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user_input = self.loop_body.clone();
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self.loop_body = String::new();
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}
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}
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if self.loop_depth != 0 {
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self.loop_body.push_str(&user_input);
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return;
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}
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}
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}
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if user_input.is_empty() || user_input.len() == 0 {
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return;
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}
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if user_input.starts_with(COMMAND_PREFIX) {
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self.run_repl_cmd(user_input);
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} else {
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match self.interpreter.run(user_input) {
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Ok(_) => {
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info!("Successfully ran brainfuck source code from REPL");
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}
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Err(e) => {
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error!("Failed to run brainfuck source code from REPL: {}", e);
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}
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}
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}
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}
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fn run_repl_cmd(&mut self, user_input: String) {
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let mut cmd = user_input.split_whitespace();
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match cmd.next() {
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Some(repl_cmd) => {
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match repl_cmd.get(COMMAND_PREFIX.len()..).unwrap_or("") {
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"fuck" => {
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println!("{}", "Bye bye :D".green());
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std::process::exit(0);
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}
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"array" | "a" => {
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println!("{}", format!("Current array: {:?}", self.interpreter.cells));
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}
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"array_size" | "as" => {
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println!(
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"{}",
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format!(
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"Current array size: {}",
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self.interpreter.cells.len().to_string().bold().green()
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)
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);
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}
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"pointer" | "p" => {
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println!(
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"{}",
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format!(
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"Current pointer: {}",
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self.interpreter.pointer.to_string().bold().green()
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)
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);
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}
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"pointer_value" | "pv" => {
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println!(
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"Current pointer value: {} = \'{}\' (char)",
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self.interpreter.cells[self.interpreter.pointer],
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self.interpreter.cells[self.interpreter.pointer].to_char().unwrap_or_else(|_| '?')
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);
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}
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"history" | "h" => {
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println!("{}", "History:".underline().green());
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for (i, cmd) in self.history.iter().enumerate() {
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println!("{}", format!("{}: {}", i, cmd));
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}
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}
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"save" | "s" => {
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let file_name = cmd.next().unwrap_or(HISTORY_FILE);
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println!(
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"{}",
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format!("Saving history to file: {file_name}").yellow()
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);
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match std::fs::write(file_name, self.history.join("\n")) {
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Ok(_) => {
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println!(
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"{}",
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format!("Successfully saved history to file: {file_name}")
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.green()
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);
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}
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Err(e) => {
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error!("Failed to save history to file: {}", e);
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}
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}
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}
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"load" | "l" => {
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let file_name = cmd.next().unwrap_or(HISTORY_FILE);
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println!(
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"{}",
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format!("Loading history from file: {file_name}").yellow()
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);
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match std::fs::read_to_string(file_name) {
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Ok(history) => {
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println!(
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"{}",
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format!("Successfully loaded history from file: {file_name}")
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.green()
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);
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self.history = history.split("\n").map(|s| s.to_string()).collect();
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// Run all commands in history
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for cmd in self.history.iter() {
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match self.interpreter.run(cmd.clone()) {
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Ok(_) => {
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info!(
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"Successfully ran brainfuck source code from REPL"
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);
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}
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Err(e) => {
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error!(
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"Failed to run brainfuck source code from REPL: {}",
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e
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);
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}
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}
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}
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}
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Err(e) => {
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error!("Failed to load history from file: {}", e);
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}
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}
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}
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"reset" | "r" => {
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println!("{}", "Resetting REPL".truecolor(56, 33, 102));
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self.interpreter.reset();
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self.history = Vec::new();
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}
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"help" => {
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println!(
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"!array, !a: print the current array\n\
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!array_size, !as: print the current array size\n\
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!pointer, !p: print the current pointer\n\
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!pointer_value, !pv: print the current pointer value\n\
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!history, !h: print the REPL history\n\
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!save, !s: save the REPL history to a file\n\
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!load, !l: load the REPL history from a file\n\
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!reset, !r: reset the REPL\n\
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!help: print this help message\n\
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!fuck: exit the REPL"
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);
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}
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_ => println!(
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"{}",
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format!(
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"Unknown command: {}, type {} to show the help",
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user_input,
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(COMMAND_PREFIX.to_string() + "help").green()
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)
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.red()
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),
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}
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}
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None => {}
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}
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}
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}
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/// Run the REPL
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/// # Arguments
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/// * `interpreter` - The interpreter to use
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pub fn start(interpreter: Interpreter) {
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info!("Entering REPL mode");
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println!(
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"{}\n\
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Brainfuck interpreter v {}\nBy {}\n\
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{}\n\
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Type {} to exit :D\n\
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type {} to get more fu*king help",
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"Welcome to the brainfuck REPL mode! :)".green(),
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clap::crate_version!().to_string().yellow(),
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clap::crate_authors!().to_string().green(),
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"Enter your brainfuck code and press enter to run it."
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.italic()
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.blue(),
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(COMMAND_PREFIX.to_string() + "fuck").bold().red(),
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(COMMAND_PREFIX.to_string() + "help").bold().green(),
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);
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match Repl::new(interpreter).run() {
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Ok(_) => {
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info!("Successfully ran REPL");
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}
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Err(e) => {
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error!("Failed to run REPL: {}", e);
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std::process::exit(1);
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use pretty_assertions::assert_eq;
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use crate::bf_interpreter::cell::Cell;
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#[test]
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fn nested_loop_level_1() {
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let term = Term::stdout();
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let interpreter = Interpreter::new(4, vec![], term);
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let mut repl = Repl::new(interpreter);
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repl.process("++".to_string());
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repl.process("[>++".to_string());
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repl.process("[>+<-]".to_string());
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repl.process("<-]".to_string());
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let cells = &repl.interpreter.cells;
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assert_eq!(cells[0], Cell::default_cell(&vec![]));
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assert_eq!(cells[1], Cell::default_cell(&vec![]));
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assert_eq!(cells[2], Cell::new(4, &vec![]));
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}
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#[test]
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fn nested_loop_level_2() {
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let term = Term::stdout();
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let interpreter = Interpreter::new(4, vec![], term);
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let mut repl = Repl::new(interpreter);
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repl.process("++".to_string());
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repl.process("[>++".to_string());
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repl.process("[>+<-]".to_string());
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repl.process("[>++".to_string());
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repl.process("[>+<-]".to_string());
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repl.process("<-]".to_string());
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repl.process("<-]".to_string());
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let cells = &repl.interpreter.cells;
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assert_eq!(cells[0], Cell::default_cell(&vec![]));
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assert_eq!(cells[1], Cell::default_cell(&vec![]));
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assert_eq!(cells[2], Cell::new(4, &vec![]));
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}
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#[test]
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fn print_my_first_name() {
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let term = Term::stdout();
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let interpreter = Interpreter::new(10, vec![], term);
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let mut repl = Repl::new(interpreter);
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let code = "++++ ++++ 8
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[
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>++++
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[
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>++ A
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>+++ a
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>++++
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>+ space
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<<<<-
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]
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>>>>>>++
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[
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<<<-
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>>>-
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]
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<<<<<<<-
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]
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>>+. Print cell 2: A
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<<++++
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[
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>+++
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[
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>+++
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<-
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]
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>++
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<<-
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]
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>>+. Print n
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<<+++
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[
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>+++
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[
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>-
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<-
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]
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>-
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<<-
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]
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>>-. Print n
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<<++++++
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[
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>>+++
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<<-
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]
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>>. Print s"
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.to_string()
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.split("\n")
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.map(|s| s.to_string())
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.collect::<Vec<String>>();
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for line in code {
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repl.process(line);
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}
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assert_eq!(repl.interpreter.cells[0], Cell::default_cell(&vec![]));
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assert_eq!(repl.interpreter.cells[1], Cell::default_cell(&vec![]));
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assert_eq!(repl.interpreter.cells[2], Cell::new(115, &vec![]));
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assert_eq!(repl.interpreter.cells[3], Cell::new(96, &vec![]));
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assert_eq!(repl.interpreter.cells[4], Cell::new(112, &vec![]));
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assert_eq!(repl.interpreter.cells[5], Cell::new(32, &vec![]));
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}
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#[test]
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fn print_my_first_name_in_one_command() {
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let term = Term::stdout();
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let interpreter = Interpreter::new(10, vec![], term);
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let mut repl = Repl::new(interpreter);
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let code = "++++++++[>++++[>++>+++>++++>+<<<<-]>>>>>>++[<<<->>>-]<<<<<<<-]>>+.\
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<<++++[>+++[>+++<-]>++<<-]>>+.<<+++[>+++[>-<-]>-<<-]>>-.<<++++++[>>+++<<-]>>."
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.to_string();
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repl.process(code);
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assert_eq!(repl.interpreter.cells[0], Cell::default_cell(&vec![]));
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assert_eq!(repl.interpreter.cells[1], Cell::default_cell(&vec![]));
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assert_eq!(repl.interpreter.cells[2], Cell::new(115, &vec![]));
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assert_eq!(repl.interpreter.cells[3], Cell::new(96, &vec![]));
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assert_eq!(repl.interpreter.cells[4], Cell::new(112, &vec![]));
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assert_eq!(repl.interpreter.cells[5], Cell::new(32, &vec![]));
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}
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#[test]
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fn print_hello_world() {
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let term = Term::stdout();
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let interpreter = Interpreter::new(10, vec![], term);
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let mut repl = Repl::new(interpreter);
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let _ = "[ This program prints \"Hello World!\" and a newline to the screen, its
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length is 106 active command characters. [It is not the shortest.]
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]
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++++++++ Set Cell #0 to 8
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[
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>++++ Add 4 to Cell #1; this will always set Cell #1 to 4
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[ as the cell will be cleared by the loop
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>++ Add 2 to Cell #2
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>+++ Add 3 to Cell #3
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>+++ Add 3 to Cell #4
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>+ Add 1 to Cell #5
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<<<<- Decrement the loop counter in Cell #1
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] Loop until Cell #1 is zero; number of iterations is 4
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>+ Add 1 to Cell #2
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>+ Add 1 to Cell #3
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>- Subtract 1 from Cell #4
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>>+ Add 1 to Cell #6
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[<] Move back to the first zero cell you find; this will
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be Cell #1 which was cleared by the previous loop
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<- Decrement the loop Counter in Cell #0
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] Loop until Cell #0 is zero; number of iterations is 8
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The result of this is:
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Cell no : 0 1 2 3 4 5 6
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Contents: 0 0 72 104 88 32 8
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Pointer : ^
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>>. Cell #2 has value 72 which is 'H'
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>---. Subtract 3 from Cell #3 to get 101 which is 'e'
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+++++++..+++. Likewise for 'llo' from Cell #3
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>>. Cell #5 is 32 for the space
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<-. Subtract 1 from Cell #4 for 87 to give a 'W'
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<. Cell #3 was set to 'o' from the end of 'Hello'
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+++.------.--------. Cell #3 for 'rl' and 'd'
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>>+. Add 1 to Cell #5 gives us an exclamation point
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>++. And finally a newline from Cell #6
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"
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.to_string()
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.split("\n")
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.for_each(|s| repl.process(s.to_string()));
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}
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}
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