ludic/examples/library/os.ludic
Orkuncakilkaya 647dfec334 feat(compiler): list literals, typed compound assignment, file:line diagnostics
- `[a, b, c]` list literals (E_LIST → emit_list); static_type learns
  slice-element, `new T`, list, string and literal kinds
- `x op= y` lowers through the same path as `x = x op y` (emit_bin_vals):
  fixed `*=`/`/=` use the Q16.16 64-bit paths, string `+=` concatenates,
  int→long widens; unary `-` keeps a fixed operand's type (arith_ty)
- one `unescape()` table for "strings", 'chars' and `interpolation`;
  `'\''`, `'\\'`, `'\"'` no longer read as 0; unterminated char literals
  and unexpected characters are errors instead of silently skipped
- every diagnostic is `file:line: error: msg` (g_parse_file / g_err_file,
  Node.file + Node.line set by node()); tok_desc() in expectation errors;
  duplicate `function` names and unknown `phase` names are reported in
  source terms (phase_id used to default unknown phases to Overlay)
- interpolation holes skip braces inside string literals
- hand-IR preludes move from the user `@fn_` prefix to `@lp_` so a user
  `is_ws` / `str_eq` / `path_join` no longer collides at link time
- `@ClearColor(expr)` accepts any constant expression; `Os.pid()` added
  (docs page + inventory); `str_starts()` in support/str
- main.ludic: `else if` flag ladder, char literals, stale script comments
- examples/lang/operators.ludic covers all of the above; os.ludic covers
  Os.pid; docs pages for Os.pid and the Overlay phase; ten changesets
- reseeded: selfhost/ludicc.seed.ll is the new compiler's own fixpoint

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
2026-09-05 01:12:16 +03:00

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# os.ludic — Os.* environment interface. args/env/platform are non-deterministic
# host input, so instead of fixed answers we assert the invariants that must hold
# regardless of where it runs: an env var round-trips, env_or falls back when a
# var is unset, unset removes it, args() agrees with arg_count(), and the host
# facts and known folders are all non-empty. Running it prints: 1 2 3 4 5 6 7 8 9 10 11 12 13 14
program Os {
entry {
# environment variables round-trip through set/get
if Os.set_env("LUDIC_OS_TEST", "42") { print(1) }
if Os.env("LUDIC_OS_TEST") == "42" { print(2) }
if Os.has_env("LUDIC_OS_TEST") { print(3) }
# env_or returns the fallback for a variable that is not set
if Os.env_or("LUDIC_OS_DEFINITELY_UNSET", "fallback") == "fallback" { print(4) }
# unset removes the variable
if Os.unset_env("LUDIC_OS_TEST") { print(5) }
if not Os.has_env("LUDIC_OS_TEST") { print(6) }
# the argument vector always carries at least the program path, and args()
# is a []string of exactly arg_count() elements
if Os.arg_count() >= 1 { print(7) }
if len(Os.args()) == Os.arg_count() { print(8) }
# platform and arch are non-empty host facts
if len(Os.platform()) > 0 { print(9) }
if len(Os.arch()) > 0 { print(10) }
# per-user known folders resolve to non-empty paths
if len(Os.save_dir("MyGame")) > 0 { print(11) }
if len(Os.temp_dir()) > 0 { print(12) }
# the process id is a live, positive OS handle
if Os.pid() > 0 { print(13) }
# diagnostics go to stderr, so they never disturb this program's stdout
Os.stderr_write("os.ludic: hello from stderr\n")
print(14)
}
}