LMScript & LMCode Cheat Sheet

Outer LMScript (.lms)

1. LMScript Syntax At a Glance

# Constants, variables & 0-based collections
const DOMAIN = "lmscript.io";
x  = 42;
xs = ["a", "b", "c"];      # xs[0] == "a", xs[-1] == "c"
m  = {host: "db", port: 5432};

# Strings, Regex & Path literals
s1  = f"host={m.host}:{m.port}";
s2  = r"^\d+\.\d+$";
cfg = path"config/settings.json";
one = regex_find("cpu 72% mem 88%", r"\d+%");     # "72%"
all = regex_matches("cpu 72% mem 88%", r"\d+%");  # ["72%", "88%"]
pos("let x", 0);
tok = regex_find_pos("let x", r"[A-Za-z_]\w*");   # "let", pos() -> 3

# Control flow & Loops ({ } blocks, ; terminators)
if (x > 10 && m.port == 5432) {
  println(s1);
} else if (x == 0) {
  println("zero");
} else {
  println("other");
}

for (val in xs) { println(val); }
for (k in m)    { println(f"{k}={m[k]}"); }
for (i = 0; i < 5; i = i + 1) { println(i); }

# Functions (hoisted, recursion allowed, isolated locals)
fn greet(who) {
  msg = f"Hello, {who}!";
  return msg;
}

prog = _lmcode_ cli="lmaws" install="github:lmctl-ai/lmaws@v0.1.34";
  # Strongly typed locals (let + ; required)
  let count  = 3;
  let ratio  = 1.25;
  let active = true;

  # Quote-lists (0-indexed!) & homogeneous maps
  let names   = qw(alpha beta gamma);        # StrList
  let nums    = qi(10 20 30);                # IntList
  let weights = qf(0.5 1.5 2e-2);            # FloatList
  let tags    = %(env => "prod", tier => "web"); # StrMap

  # Validated JSONC heredoc -> immutable Json handle
  let doc = json <<~JSON;
    { "domain": "lmscript.io", "ports": [80, 443] }
  JSON

  # Control flow & 0-based range
  for (name in names) {
    if (name == "alpha" && active) {
      lmcode_return_put("first", name);
    }
  }
  for (i in range(0, nums.len())) {
    lmcode_return_put("sum", nums.at(i) + count);
  }
end _lmcode_

r = run_lmcode(prog);