ludic/examples/cancel.ludic
Orkuncakilkaya bca8f126fc Networking N2–N6, and a fully C-free toolchain
Implement the rest of NETWORKING-DESIGN.md (N2–N6) and eliminate every
`.c` file from the repo. clang remains only the LLVM-IR assembler; no C
is compiled anywhere.

Networking (selfhost/emit_net.ludic + parser/emit changes):
- N2 @Sync: per-model serialize/apply + by-kind dispatchers; POD-scalar
  compile error and empty-participation warning; selective replication.
- N3 @Owned: @L_owner array + owner/set_owner/is_owner; owners snapshot.
- N4 @ToServer/@ToClients remote events: framed net_send + net_pump re-emit.
- N5 @Server/@Predicted role guards + drivable sim (tick_fixed/tick_render,
  entry-owns-the-loop).
- Built-in loopback transport so multiplayer runs with zero foreign code;
  extern fn net_send/net_poll still overrides it for a real socket.
- N6 blessed runtime (examples/net_rt.ludic) + end-to-end demo (net_demo).
- Fix: llty("entity") is now i32 (entities are i32 handles), so let e = self().

C elimination:
- Networking + foreign-mod-ABI tests rewritten as self-contained pure-Ludic
  programs (examples/net_*, world_*, mod_events, scoped); tests/ removed.
- Reflection ABI exposed to Ludic as world_* builtins (Ludic-to-Ludic modding).
- Formatter rewritten C→Ludic: tools/ludic-tools/fmt.ludic.
- Language server rewritten C→Ludic: tools/ludic-tools/lsp.ludic (lexer, index
  parser, cross-file workspace resolver, JSON, all LSP handlers).
- Obsolete migrate_*.c codemods deleted; ludic_syntax.h kept as vocabulary data.

Suites: ./test.sh 44/44, ./tools/test-tools.sh 28/28 (LSP 42/42), fixpoint holds.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-08-29 15:08:23 +03:00

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# cancel.ludic — EV3: cancellable (decision) events.
#
# A `cancellable` event is fired BEFORE an action so a listener can veto it. The
# listener calls `cancel`; the caller reads the verdict back — `emit E(…)` used as
# an expression yields the cancelled flag (1 = vetoed, 0 = allowed). A foreign mod
# vetoes the same way, by setting the payload's trailing `cancelled` field over
# the ABI. This is the modding headline: observation becomes control.
#
# Running it prints: 0 1 92
program Cancel {
event cancellable BeforeHurt { amount: int = 0 }
@On(BeforeHurt) handler Armor { if amount > 10 { cancel } } # veto any hit over 10
entry {
let v1 = emit BeforeHurt(amount: 5) # 5 <= 10 -> allowed
print(v1) # 0
let v2 = emit BeforeHurt(amount: 15) # 15 > 10 -> vetoed
print(v2) # 1
# the realistic shape: only apply the effect when the decision isn't vetoed
var hp = 100
if emit BeforeHurt(amount: 8) == 0 { hp = hp - 8 } # allowed -> 92
if emit BeforeHurt(amount: 50) == 0 { hp = hp - 50 } # vetoed -> unchanged
print(hp) # 92
}
}