297 lines
11 KiB
Rust
297 lines
11 KiB
Rust
use super::repl::Repl;
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use crate::bf_interpreter::interpreter::Interpreter;
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use crate::repl::repl::{COMMAND_PREFIX, HISTORY_FILE, PROMPT};
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use colored::Colorize;
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use console::Key;
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use std::io::Write;
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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
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.history
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.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).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 if !input.is_empty() => {
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self.term.clear_line()?;
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self.print_prompt();
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self.term.write_str(&input[0..input.len() - 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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let mut print = false;
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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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} else if ch == '.' {
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print = true;
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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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if print {
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println!(); // Print newline after output, if user requested print any output
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}
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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]
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.to_char()
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.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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