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use clap::Args;
use crossterm::{
cursor,
event::{self, Event, KeyCode, KeyEvent, KeyModifiers},
execute as cs_execute,
terminal::{self, ClearType},
};
use std::{
io::{self, Write},
rc::Rc,
};
use mruby_compiler2_sys as mrbc;
use mrubyedge::{
RObject,
yamrb::{helpers::mrb_call_inspect, value::RHashMap},
};
#[derive(Args)]
pub struct ReplArgs {
/// Show verbose output
#[arg(short = 'v', long)]
pub verbose: bool,
}
pub fn execute(args: ReplArgs) -> Result<(), Box<dyn std::error::Error>> {
eprintln!("mruby/edge REPL ({})", mrubyedge::version!());
eprintln!("Type 'exit[↩]' or press Ctrl+D to quit");
eprintln!(
"Press Enter to execute, Option+Enter(Shift+Enter also supported in iTerm2) for line continuation"
);
eprintln!();
// Initialize VM with empty rite
let empty_code = "";
let mrb_bin = unsafe {
let mut ctx = mrbc::MRubyCompiler2Context::new();
ctx.compile(empty_code)?
};
let mut rite = mrubyedge::rite::load(&mrb_bin)?;
let mut vm = mrubyedge::yamrb::vm::VM::open(&mut rite);
mrubyedge_math::init_math(&mut vm);
mrubyedge_time::init_time(&mut vm);
// Enable raw mode
terminal::enable_raw_mode()?;
let mut stdout = io::stdout();
let mut line_number = 1;
let mut buffer = String::new();
let mut current_line = String::new();
// Print initial prompt
print!("repl:{:03}> ", line_number);
stdout.flush()?;
let mut top_level_lvars: RHashMap<String, Rc<RObject>> = RHashMap::default();
let mut ctx = unsafe { mrbc::MRubyCompiler2Context::new() };
let result = (|| -> Result<(), Box<dyn std::error::Error>> {
loop {
// Read key event
if let Event::Key(key_event) = event::read()? {
match key_event {
// Ctrl+D - Exit
KeyEvent {
code: KeyCode::Char('d'),
modifiers: KeyModifiers::CONTROL,
..
} => {
terminal::disable_raw_mode()?;
println!();
break;
}
// Ctrl+C - Clear current line
KeyEvent {
code: KeyCode::Char('c'),
modifiers: KeyModifiers::CONTROL,
..
} => {
terminal::disable_raw_mode()?;
println!();
current_line.clear();
buffer.clear();
line_number += 1;
print!("repl:{:03}> ", line_number);
stdout.flush()?;
terminal::enable_raw_mode()?;
}
// Alt+Enter (Option+Enter) - Add line to buffer and continue
KeyEvent {
code: KeyCode::Enter,
modifiers: KeyModifiers::ALT | KeyModifiers::SHIFT,
..
} => {
terminal::disable_raw_mode()?;
println!();
buffer.push_str(¤t_line);
buffer.push('\n');
current_line.clear();
print!("repl:{:03}* ", line_number);
stdout.flush()?;
terminal::enable_raw_mode()?;
}
// Regular Enter - Execute buffer
KeyEvent {
code: KeyCode::Enter,
modifiers: KeyModifiers::NONE,
..
} => {
terminal::disable_raw_mode()?;
println!();
// Add current line to buffer
if !current_line.is_empty() {
buffer.push_str(¤t_line);
buffer.push('\n');
}
if buffer.trim().is_empty() {
current_line.clear();
print!("repl:{:03}> ", line_number);
stdout.flush()?;
terminal::enable_raw_mode()?;
continue;
}
// Check for exit command
let trimmed = buffer.trim();
if trimmed == "exit" || trimmed == "quit" {
break;
}
// Execute buffered code
unsafe {
if args.verbose {
ctx.dump_bytecode(&buffer).unwrap();
}
match ctx.compile(&buffer) {
Ok(mrb_bin) => match mrubyedge::rite::load(&mrb_bin) {
Ok(mut new_rite) => {
// FIXME: sub ireps's lv not handled yet
let top_rep = &new_rite.irep[0];
for (reg, name) in top_rep.lv.iter().enumerate() {
if let Some(name) = name
&& let Some(value) = top_level_lvars
.get(&name.to_string_lossy().to_string())
{
vm.regs[reg + 1] = value.clone().into();
}
}
match vm.eval_rite(&mut new_rite) {
Ok(result) => match mrb_call_inspect(&mut vm, result) {
Ok(inspect_result) => {
match TryInto::<String>::try_into(
inspect_result.as_ref(),
) {
Ok(s) => println!(" => {}", s),
Err(_) => println!(" => <unprintable>"),
}
}
Err(_) => println!(" => <inspect failed>"),
},
Err(e) => {
eprintln!("{:?}", e);
vm.exception.take();
}
}
// Display top-level local variables
if let Some(lv) = &vm.current_irep.lv {
for (reg, name) in lv.iter() {
let value =
vm.regs[*reg].as_ref().cloned().unwrap_or(
RObject::nil().to_refcount_assigned(),
);
top_level_lvars
.insert(name.to_string(), value.clone());
}
for (k, v) in top_level_lvars.iter() {
let inspect: String =
mrb_call_inspect(&mut vm, v.clone())
.unwrap()
.as_ref()
.try_into()
.unwrap();
if args.verbose {
eprintln!(" [lv] {} => {}", k, inspect);
}
}
}
}
Err(e) => {
eprintln!("Failed to load bytecode: {:?}", e);
}
},
Err(e) => {
eprintln!("Compilation error: {}", e);
}
}
}
buffer.clear();
current_line.clear();
line_number += 1;
print!("repl:{:03}> ", line_number);
stdout.flush()?;
terminal::enable_raw_mode()?;
}
// Backspace
KeyEvent {
code: KeyCode::Backspace,
..
} => {
if !current_line.is_empty() {
current_line.pop();
cs_execute!(
stdout,
cursor::MoveLeft(1),
terminal::Clear(ClearType::UntilNewLine)
)?;
stdout.flush()?;
}
}
// Regular character input
KeyEvent {
code: KeyCode::Char(c),
modifiers: KeyModifiers::NONE | KeyModifiers::SHIFT,
..
} => {
current_line.push(c);
print!("{}", c);
stdout.flush()?;
}
_ => {
// Ignore unhandled key events
}
}
}
}
Ok(())
})();
// Disable raw mode
terminal::disable_raw_mode()?;
if args.verbose {
eprintln!("REPL session ended");
}
result
}