Next-Level & Cluster
Next-Level
Cluster, heard you’re building a custom editor—let’s see if it can parse a 200KB config faster than my game’s AI loop. Ready to prove your speed?
Cluster
Sure, but first let’s get some numbers. I’ll hand‑roll a minimal lexer in Rust, run a quick micro‑benchmark on your 200 KB file, and compare it to your AI loop. No third‑party libs, no guesswork. If I win, you’ll have to admit my editor’s faster than your game’s AI. If not, we’ll tweak the parser or your AI code. Ready?
Next-Level
Bring it on—show me your lexer, I’ll drop my AI loop, and we’ll crunch the data. Whoever finishes first wins the brag rights. Let's do this.
Cluster
```rust
// minimal lexer for a custom config format
// no external crates, pure std
use std::fs::File;
use std::io::{self, Read};
use std::time::Instant;
#[derive(Debug, PartialEq)]
enum Token {
Identifier(String),
Number(String),
Equal,
Newline,
EOF,
}
struct Lexer {
input: Vec<char>,
pos: usize,
cur: Option<char>,
}
impl Lexer {
fn new(s: String) -> Self {
let mut l = Lexer {
input: s.chars().collect(),
pos: 0,
cur: None,
};
l.advance();
l
}
fn advance(&mut self) {
self.cur = self.input.get(self.pos).cloned();
self.pos += 1;
}
fn skip_whitespace(&mut self) {
while matches!(self.cur, Some(c) if c.is_whitespace() && c != '\n') {
self.advance();
}
}
fn next_token(&mut self) -> Token {
self.skip_whitespace();
match self.cur {
Some(c) if c == '=' => {
self.advance();
Token::Equal
}
Some(c) if c == '\n' => {
self.advance();
Token::Newline
}
Some(c) if c.is_alphabetic() || c == '_' => {
let mut ident = String::new();
while let Some(ch) = self.cur {
if ch.is_alphanumeric() || ch == '_' {
ident.push(ch);
self.advance();
} else {
break;
}
}
Token::Identifier(ident)
}
Some(c) if c.is_digit(10) => {
let mut num = String::new();
while let Some(ch) = self.cur {
if ch.is_digit(10) {
num.push(ch);
self.advance();
} else {
break;
}
}
Token::Number(num)
}
Some(_) => {
self.advance();
self.next_token()
}
None => Token::EOF,
}
}
}
fn main() -> io::Result<()> {
let mut file = File::open("config.cfg")?;
let mut contents = String::new();
file.read_to_string(&mut contents)?;
let start = Instant::now();
let mut lexer = Lexer::new(contents);
loop {
let token = lexer.next_token();
if token == Token::EOF {
break;
}
// normally we'd process the token, but we just want timing
}
let duration = start.elapsed();
println!("Lexer finished in: {:.2?}", duration);
Ok(())
}
```
Next-Level
Nice snippet—clear, no crate overhead. I’d bet my AI loop runs in about the same ballpark, but let’s push it: try a byte‑slice lexer, skip the Vec<char> and just index the string. That’ll shave a few ms. Also profile the token generation, see if the recursion in `next_token` for non‑matching chars hurts. Let’s see those numbers, and if yours wins, I’ll buy you a coffee, but I’ll still claim my AI’s tighter. Ready to benchmark?