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use std::io::{self, BufRead, Write};
use crate::{lexer::Lexer, parser::Parser, token::Kind};
use super::{bytecode::compiler::Compiler, vm::VM};
const PROMPT: &str = "-> ";
pub fn start() {
let mut buf = String::new();
let mut stdin = io::stdin().lock(); // We get `Stdin` here.
let debug_lexer = false;
let debug_parser = false;
let show_error = true;
loop {
io::stdout().lock().write_all(PROMPT.as_bytes()).unwrap();
io::stdout().flush().unwrap();
match stdin.read_line(&mut buf) {
Ok(_) => {
let lexer = Lexer::new(buf.clone());
let mut cloned_lexer = lexer.clone();
if debug_lexer {
loop {
let cur_token = cloned_lexer.next_token();
println!("Debug Output (Lexer) >> {:?}", cur_token);
if cur_token.kind == Kind::EOF {
break;
}
}
}
let mut parser = Parser::new(lexer);
let program = parser.parse();
if debug_parser {
println!("Debug Output (Parser) >> {:?}", program);
}
if let Ok(program) = program {
let comp_rst = Compiler::create();
if comp_rst.is_err() {
println!(
"Error while compiler creation {:?}",
comp_rst
);
continue;
}
let mut compiler = comp_rst.unwrap();
let comp = compiler.compile(program);
if comp.is_err() {
println!("Error while compiler creation {:?}", comp);
continue;
}
let bytecode_rst = compiler.bytecode();
match bytecode_rst {
Ok(_) => (),
Err(err) => {
println!("Error while taking bytecode {:?}", err);
continue;
}
}
let mut vm =
unsafe { VM::new(bytecode_rst.unwrap_unchecked()) };
buf.clear();
println!("Intitial state:{}", vm);
println!("Commands:");
println!("\tpressing enter: excute next cycle.");
println!("\t exit: terminate");
loop {
match stdin.read_line(&mut buf) {
Ok(_) => {
// HACK: clear screen
println!("\n\n\n\n\n\n\n\n\n");
println!("\n\n\n\n\n\n\n\n\n");
println!("\n\n\n\n\n\n\n\n\n");
println!("\n\n\n\n\n\n\n\n\n");
if buf == "exit" {
break;
}
if !vm.is_runable() {
break;
}
if let Err(e) = vm.run_single() {
eprintln!("{:?}", e);
}
println!("{}", vm);
}
Err(err) => {
println!("Error occured during reading stdin");
println!("{:?}", err);
}
}
}
println!("VM Terminated.");
println!("Please give new input.");
} else if show_error {
println!("!!!> ERROR OCCURED <!!!");
for errs in program.err().unwrap() {
println!(">> ERROR DETAIL ");
for err in errs {
println!("Pos>> {:?}", err.as_ref().position());
println!("Detail>> {} ", err.as_ref().detail());
}
}
}
buf.clear();
}
Err(err) => {
println!("Error occured during reading stdin");
println!("{:?}", err);
return;
}
}
}
}