SamandClaude Fable 5.1
5af3a15d0e
- a nameplate's name and level stop popping a pixel every other step as the plate slides, and the whole plate no longer jumps 19 px to the top of the screen on a rounding tie; the chat bubble takes the same fix (2172) - creatures and other players stop sinking through the ground while the world is still streaming in, where a Stormwind patroller had been 31 yd under its street: a body our world cannot yet answer for holds the server's pose (2174) - select and the string metatable are gone, as in 1.12's Lua 5.0: pfUI's heal prediction parses its messages with the right format, BuffCheck2's own select wins its fallback, and a method call on a string raises the reference's own error (2171) - the camera's water collision comes back out for now: with the pivot a hair under the plane, a surface swimmer's camera snapped in and out against the waterline, so the boom ignores water again (2173) Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
421 lines
22 KiB
Rust
421 lines
22 KiB
Rust
//! **Client-identity and script-evaluation verbs** — the small engine globals an addon asks for
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//! before it does anything else (1188 phase 5, prioritised by the phase 6 corpus).
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//!
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//! These are not a guess at what addons want. They are the top of the measured demand list: over a
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//! 218-addon vanilla corpus, `GetBuildInfo` is called by 69 addons and `RunScript` by 52, and both
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//! are called *at file scope* — so a missing one does not degrade an addon, it stops the addon's
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//! very first chunk with `attempt to call global … (a nil value)`. `GetBuildInfo` alone was the
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//! first error for the whole Ace/Atlas/AtlasLoot family, which is a large slice of the ecosystem.
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//!
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//! ## The host-fed pair (decision 1195)
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//!
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//! `GetRealmName` and `GetFramerate` are the next two down that list — 24 addons are stopped dead
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//! by `GetRealmName` at file scope, and it is the **top runtime wall in the corpus** after the
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//! dialect gap. Both read a slot the app pushes, the same shape as the zone-text family: the
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//! engine owns the verb, the host owns the fact.
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//!
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//! `GetRealmName` returning `""` before a realm is known is deliberate and is what the reference
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//! does at the glue screen. An addon keys its saved variables on it (`db[GetRealmName()]`), so
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//! answering `nil` would make that a `table index is nil` error one call deeper — the failure mode
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//! we have been paying for all arc.
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use mlua::{Lua, MultiValue, Value};
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use super::Model;
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/// The 1.12.1 client's own build identity, read out of `WoW.exe`'s string table rather than
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/// remembered: `5875` and `1.12.1` sit adjacent in the binary, and `Sep 19 2006` is its only
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/// build-date string.
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///
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/// **Hardcoding is the faithful answer here, not a shortcut.** benilla targets exactly 1.12.1
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/// (decision 1188), so these are constants of the target, not of our build — an addon asking
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/// `GetBuildInfo()` is asking "which client am I on", and the honest answer is the one we
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/// implement the API of. Our *own* build stamp is a different question with a different verb
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/// ([`crate::script`] has no binding for it, and the reference has none either).
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const VERSION: &str = "1.12.1";
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const BUILD: &str = "5875";
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const BUILD_DATE: &str = "Sep 19 2006";
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// There was a `TOC_VERSION = 11200` here, and `GetBuildInfo` pushed it as a fourth value. The
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// in-game registrar pushes three (decision 1842); the interface number is a later expansion's
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// return, and `benilla.toc`'s own `## Interface` line is where that number belongs.
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pub(super) fn install(lua: &Lua) -> mlua::Result<()> {
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let g = lua.globals();
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// `GetLocale()` -> one string, and `IsMacClient()` -> nil, both ARITY-EXACT in the reference's
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// own shape table (`re/audit/binding-shapes.tsv`: `GetLocale 0x46ce40`/`0x48d8b0` is
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// `0 -> 1 (string?)`, `IsMacClient 0x48c980` is `0 -> 1 (nil)`, both `exact`/`agree`).
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//
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// **`IsMacClient` answering nil is the whole verb, not a placeholder.** The table records the
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// return KIND as `(nil)` — this binding pushes nil on the PC build the reference was carved
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// from, and there is nothing else for it to say. FrameXML branches on it for Mac-only key
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// labels; nil takes the PC arm, which is the arm this client wants.
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//
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// `GetLocale` is the two-registration case the shape gate warns about (1843): a glue copy and
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// an in-game copy, same shape. Ours answers the one locale this client ships against — the
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// enUS `GlobalStrings.lua` the manifest loads and 1804's reference defaults are read from.
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// Decision 1880.
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g.set(
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"GetLocale",
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lua.create_function(|lua, ()| lua.create_string("enUS"))?,
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)?;
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g.set("IsMacClient", lua.create_function(|_, ()| Ok(Value::Nil))?)?;
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// **`FrameXML_Debug([v])` — the XML loader's own trace switch, get-or-set** (decision 2160,
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// wow-re `ui/scratch/framexml-debug-trace-flag.md`). `0x488440` reads the global `[0xceea30]`
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// through `0x6edb40`, and:
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//
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// - a **Lua-truthy** argument takes the SET arm (`0x48845d je` after `lua_toboolean 0x6f34d0`)
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// — so `FrameXML_Debug(0)` genuinely disables it rather than being a masked no-op, because
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// the NUMBER zero is truthy in Lua; only `nil`/`false` are not;
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// - the stored value is `lua_tonumber` truncated **toward zero** (`0x40a2b0`), so `1.9` is 1
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// and a non-numeric string is 0, which is 5.0's `tonumber` coercion;
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// - an absent, nil or false argument is a pure GET and leaves the flag alone;
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// - it always returns ONE number — the flag's value *after* the call
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// (`re/audit/binding-shapes.tsv`: `argc 1 exact, returns 1, (number), agree`).
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//
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// The reference ships a call to it commented out in its own `BasicControls.xml:20`; the
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// corpus's consumer is `ImprovedErrorFrame`, which drives it off a saved `XMLDebug` CVar at
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// its OnLoad and died on the missing global. What it gates is
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// [`crate::loader::LoadReport::traces`].
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g.set(
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"FrameXML_Debug",
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lua.create_function(|lua, v: Value| {
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let model = lua.app_data_ref::<Model>().expect("model app_data");
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let truthy = !matches!(v, Value::Nil | Value::Boolean(false));
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if truthy {
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// `lua_tonumber`'s coercion, then truncate toward zero. Anything that will not
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// coerce is 0 — the same answer `0x6f3620` gives for a non-numeric argument.
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let n = lua.coerce_number(v)?.unwrap_or(0.0);
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model.framexml_debug.set(n.trunc() as i32);
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}
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Ok(model.framexml_debug.get())
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})?,
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)?;
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// version, build, date — three, and no fourth (decision 1842)
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g.set(
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"GetBuildInfo",
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lua.create_function(|lua, ()| {
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Ok(MultiValue::from_vec(vec![
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Value::String(lua.create_string(VERSION)?),
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Value::String(lua.create_string(BUILD)?),
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Value::String(lua.create_string(BUILD_DATE)?),
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// **THREE, not four.** The reference's in-game `GetBuildInfo 0x4884a0` pushes
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// `(string, string, string)`; the interface/TOC number is a later-expansion return
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// and 1.12 has no fourth value here. (Its GLUE twin `0x46cd70` pushes five — the
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// same name with a different shape per registrar table, which is why 1842's gate
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// keys on the table and not the name.) Decision 1842.
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]))
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})?,
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)?;
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// `RunScript(text)` — compile and run a chunk in the shared global state.
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//
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// `RunScript 0x48b980` (pair `0x83e288`, name `0x83ea60`) is how a macro body, a `/script`
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// slash command and every addon's "evaluate this snippet" helper reach Lua. It inherits the
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// same sandbox as our chunk loader: there is no `setfenv` here and none in the reference
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// either — a script runs with full API access.
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//
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// Read end to end, its contract is four facts, and three of them were wrong here (2136's
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// "left open", closed at the bytes):
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//
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// **1 · The chunk name is the SOURCE ITSELF, verbatim.** `0x48b9c7 mov edx,eax` and
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// `0x48b9c9 mov ecx,eax` hand `lua_tostring 0x6f3690`'s one return to
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// `0x704cd0 FrameScript_Execute(code, chunkname)` as BOTH arguments. `0x704cd0` strlens the
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// code (`0x704cd7`) and passes the name straight through `FS_DoBuffer 0x704ae0`
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// (`0x704b06 push ecx`, the fourth argument of `luaL_loadbuffer 0x6f5690` at `0x704b0c`)
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// untouched. No `=`, no `@` — so `luaO_chunkid 0x6f5c40` renders it by its third rule,
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// `[string "…"]`, exactly as `loadstring`'s default source-name does (2136 §4). `=[RunScript]`
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// was a placeholder that rendered plausibly; `=` is chunkid's *print-verbatim* marker and
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// `[RunScript]` is not a literal the image contains.
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//
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// **2 · A bad argument is a SILENT NO-OP, not a raise.** `0x48b988 call 0x6f3510`
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// (`lua_isstring` — tag-based, so a *number* passes) failing takes `0x48b98f je` straight to
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// `0x48b9f3 xor eax,eax; ret`. So does a NULL from `lua_tostring` (`0x48b99f`) and an EMPTY
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// string (`0x48b9a1 cmp byte ptr [eax],0`). There is no `luaL_error 0x6f4940` anywhere in the
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// function — `RunScript(nil)` does nothing at all.
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//
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// **3 · An error does NOT reach the caller.** `0x704ae0` pushes the registered error handler
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// from the registry first (`0x704afe`, `[0x8722c8]` at `LUA_REGISTRYINDEX 0xffffd8f0`) and
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// runs the chunk as `lua_pcall(L, 0, 0, -2)` (`0x704b68`); a *compile* failure takes the other
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// leg and pcalls that same handler with the message (`0x704b42`). Either way the raise is
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// consumed, the red line is the handler's doing, and the caller's next statement runs. Raising
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// here made one bad `RunScript` abort whatever ran it — a macro could take FrameXML down with
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// it.
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//
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// **4 · It answers zero values on every path** (`xor eax,eax` at both exits).
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g.set(
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"RunScript",
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lua.create_function(|lua, text: Value| {
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// `lua_isstring` + `lua_tostring`, in one: strings and numbers coerce, everything
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// else is `None` — and `None` is the silent return, per fact 2.
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let Some(s) = lua.coerce_string(text)? else {
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return Ok(());
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};
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let raw = s.as_bytes();
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if raw.is_empty() {
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return Ok(());
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}
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// The name is the source bytes as given. Same rule as `loadstring`'s default
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// (`stdlib::loadstring`), and for the same reason: the image passes one pointer twice.
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let name = String::from_utf8_lossy(&raw).into_owned();
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if let Err(e) = lua
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.load(&*raw)
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.set_name(name)
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.set_mode(mlua::ChunkMode::Text)
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.exec()
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{
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lua.app_data_mut::<crate::script::Model>()
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.expect("model")
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.record_script_error(super::stdlib::lua_message(&e));
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}
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Ok(())
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})?,
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)?;
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// `GetRealmName()` — the realm this session is on, as the realm list spells it.
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//
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// The corpus's most-wanted engine verb after the dialect fix: 24 addons stop on it, and they
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// stop *at file scope*, because the idiom is `MyAddonDB[GetRealmName()] = …` in a chunk's
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// opening lines. `""` until the app pushes one (the glue screen's own answer), never `nil`.
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g.set(
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"GetRealmName",
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lua.create_function(|lua, ()| {
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let model = lua.app_data_ref::<Model>().expect("model app_data");
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lua.create_string(&model.realm_name)
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})?,
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)?;
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// `RequestTimePlayed()` — ask the server for /played, answered by `TIME_PLAYED_MSG`.
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//
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// **The request and the answer are two halves and only both are worth having.** The binding
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// queues a `CMSG_PLAYED_TIME` the app drains; the app fires `TIME_PLAYED_MSG(total, level)`
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// when `SMSG_PLAYED_TIME` lands. Shipping only this half would be 1203 exactly: `QuestHistory`
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// calls it and then waits on an event that never comes, which is quieter and worse than the
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// `attempt to call global` it gets today.
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//
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// It returns nothing — the answer arrives as an event, never as a return value.
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g.set(
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"RequestTimePlayed",
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lua.create_function(|lua, ()| {
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lua.app_data_mut::<Model>()
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.expect("model app_data")
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.played_time_asks += 1;
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Ok(())
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})?,
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)?;
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// `GetBindLocation()` — the hearthstone's bind location NAME, as the reference's own hearth
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// confirmation prints it (`StaticPopup.lua:1742` formats it straight into the dialog text).
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//
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// Three corpus addons read it, in three separate files: FuBar_TransporterFu
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// (`TransporterFu.lua:456`), Necrosis (`Necrosis.lua:1089`) and _LazyPig (`LazyPig.lua:623`).
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//
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// **`""` until the app pushes one, never nil — the same choice `GetRealmName` above makes, for
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// the same reason.** Necrosis CONCATENATES the result (`..GetBindLocation()`), so a nil is a
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// raise rather than a blank; the reference holds a string buffer that is empty before
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// `SMSG_BINDPOINTUPDATE` lands, and no logged-in character is ever without a bind point, so the
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// empty window is ours alone. Conflating "not yet known" with "bound nowhere" is the price, and
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// it is the price the neighbouring verb already pays deliberately.
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g.set(
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"GetBindLocation",
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lua.create_function(|lua, ()| {
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let model = lua.app_data_ref::<Model>().expect("model app_data");
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lua.create_string(&model.bind_location)
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})?,
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)?;
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// `GetFramerate()` — frames per second, as a number.
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//
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// 71 addons in the corpus call it; every performance readout on the ecosystem's FuBar/Titan
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// panels is this one verb. The app pushes a smoothed value each tick
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// ([`super::UiScript::set_framerate`]); 0 before the first push, which is what an addon's
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// `format("%.1f", GetFramerate())` needs to not error.
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g.set(
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"GetFramerate",
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lua.create_function(|lua, ()| {
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let model = lua.app_data_ref::<Model>().expect("model app_data");
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Ok(model.framerate)
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})?,
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)?;
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Ok(())
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}
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impl super::UiScript {
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/// Drain the `RequestTimePlayed()` asks queued since the last call — each one is a
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/// `CMSG_PLAYED_TIME`. [`super::UiScript::take_pvp_toggles`]'s shape, and a count for the same
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/// reason: the request packet is empty, so nothing distinguishes two asks but their number.
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pub fn take_played_time_asks(&mut self) -> u32 {
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std::mem::take(&mut self.model_mut().played_time_asks)
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}
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/// Push the hearthstone bind location's name — the host's half of `GetBindLocation`.
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///
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/// The app resolves `SMSG_BINDPOINTUPDATE`'s AreaTable id through the same catalog the
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/// hearthstone's `$z` token already goes through, so the two can never disagree about where the
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/// player is bound. Idempotent; the empty string means the packet has not landed yet.
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pub fn set_bind_location(&mut self, area_name: &str) {
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let mut model = self.model_mut();
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if model.bind_location != area_name {
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model.bind_location = area_name.to_string();
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}
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}
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/// Push the realm name — the host's half of `GetRealmName` (decision 1195).
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///
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/// Set at world entry from the realm the session actually connected to. Idempotent, and the
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/// empty string is a legitimate value (no realm yet), not a "clear".
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pub fn set_realm_name(&mut self, realm: &str) {
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{
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let mut model = self.model_mut();
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if model.realm_name != realm {
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model.realm_name = realm.to_string();
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}
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// The `realmName` CVar is the SAME fact, and it is set here so it cannot drift from
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// `GetRealmName()`. It is a real 1.12 CVar (`0x83f2d0`, persisted — the client builds
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// its SavedVariables path from it, wow-re `savedvariables-protocol.md`), and it had no
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// value at all here: `Ace/AceState.lua:27` is
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// `ace.trim(GetCVar("realmName"))` inside `SetGameState`, which EVERY Ace addon runs at
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// PLAYER_ENTERING_WORLD, so the nil became `gsub(nil, ...)` and took the family down.
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//
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// Through the **engine-write** path, not a bare slot poke. `realmName` is a persisted
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// CVar — its whole documented job is to be the last realm connected to — and a slot
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// written in place never reaches `cvar_changes`, so the host never hears it and never
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// dirties the config file. The value was therefore correct for exactly as long as the
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// process lived and absent from `config.toml` forever, which is the one thing a
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// persisted CVar must not be. `set_from_engine` is the same silent-on-unknown-name
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// write (a bare test VM registers nothing) and additionally queues the change.
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super::cvars::set_from_engine(&mut model, "realmName", realm.to_string());
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}
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}
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/// Push the current framerate — the host's half of `GetFramerate`.
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///
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/// Pushed per tick from the app's own frame clock rather than computed here: this crate has no
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/// clock, and a number an addon polls every `OnUpdate` should not be re-derived per call.
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pub fn set_framerate(&mut self, fps: f64) {
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self.model_mut().framerate = fps;
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}
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}
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#[cfg(test)]
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mod tests {
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use crate::script::UiScript;
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/// `GetBuildInfo` answers as the 1.12.1 client: **three strings, and no fourth value.**
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///
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/// This used to assert four and explain the fourth as the `tocversion` an addon compares
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/// against its own `## Interface` — which is a TBC-and-later idiom. The in-game registrar
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/// `0x4884a0` pushes `(string, string, string)` and nothing else (decision 1842); the
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/// interface number arrives in a later expansion.
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///
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/// The corpus agrees, and it is worth the count: **458 sites** write
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/// `local version = GetBuildInfo()` and take one value. **Four** destructure a fourth — and on
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/// the real 1.12 client those four read `nil`, which is what their authors shipped against.
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/// Handing them `11200` was benilla being more generous than the client, which is the superset
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/// 1189 exists to stop.
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///
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/// **The same name has a different shape in the glue registrar** (`0x46cd70`, five strings).
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/// This VM is the in-game one. That pair is why 1842's gate keys on the table, not the name.
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#[test]
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fn get_build_info_answers_as_the_1_12_1_client() {
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let s = UiScript::new().unwrap();
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assert_eq!(
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s.eval::<Vec<String>>("return { GetBuildInfo() }").unwrap(),
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vec!["1.12.1", "5875", "Sep 19 2006"]
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);
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assert_eq!(
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s.arity("GetBuildInfo()").unwrap(),
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3,
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"three values, never a fourth"
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);
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}
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/// `GetRealmName` answers `""` before the host pushes one — **never `nil`**, because the
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/// corpus idiom is `MyAddonDB[GetRealmName()] = …` at file scope and a nil index errors one
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/// call deeper, far from the cause.
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#[test]
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fn get_realm_name_is_empty_before_it_is_known_and_the_host_pushes_it() {
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let mut s = UiScript::new().unwrap();
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assert_eq!(s.eval::<String>("return GetRealmName()").unwrap(), "");
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assert!(
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s.eval::<bool>("local t = {} t[GetRealmName()] = 1 return t[''] == 1")
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.unwrap(),
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"the empty string is a usable table key; nil is not, and that is the whole point"
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);
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s.set_realm_name("Whitemane");
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assert_eq!(
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s.eval::<String>("return GetRealmName()").unwrap(),
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"Whitemane"
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);
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}
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/// `GetFramerate` is a number from the first call, so `format("%.1f", GetFramerate())` in an
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/// addon's `OnUpdate` cannot error before the app has pushed a frame.
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#[test]
|
|
fn get_framerate_is_a_number_before_the_first_push() {
|
|
let mut s = UiScript::new().unwrap();
|
|
assert_eq!(s.eval::<f64>("return GetFramerate()").unwrap(), 0.0);
|
|
assert_eq!(
|
|
s.eval::<String>("return format(\"%.1f\", GetFramerate())")
|
|
.unwrap(),
|
|
"0.0"
|
|
);
|
|
s.set_framerate(59.94);
|
|
assert_eq!(
|
|
s.eval::<String>("return format(\"%.1f\", GetFramerate())")
|
|
.unwrap(),
|
|
"59.9"
|
|
);
|
|
}
|
|
|
|
/// `RunScript` runs its text in the shared global state, and a failure is **recorded, not
|
|
/// raised** — `0x704ae0` runs the chunk under `lua_pcall(L, 0, 0, -2)` with the registry's
|
|
/// error handler, so the raise never reaches the caller. (The full contract, and the three
|
|
/// silent legs, are in `script::tests::stdlib`.)
|
|
///
|
|
/// This test used to assert the opposite, on the reasoning that "a silent nil is a broken
|
|
/// macro that looks fine". The reasoning was sound and the premise was not: the reference is
|
|
/// not silent, it hands the message to the error handler and keeps going. Failing loudly *at
|
|
/// the caller* is the part it does not do, and doing it meant one bad macro could abort the
|
|
/// FrameXML function that ran it.
|
|
#[test]
|
|
fn run_script_evaluates_in_the_shared_state_and_reports_without_raising() {
|
|
let mut s = UiScript::new().unwrap();
|
|
s.run(r#"RunScript("RunScriptProbe = 41 + 1")"#).unwrap();
|
|
assert_eq!(s.eval::<i64>("return RunScriptProbe").unwrap(), 42);
|
|
s.run(r#"RunScript("this is not lua")"#)
|
|
.expect("a malformed script is caught inside RunScript, not raised at its caller");
|
|
let errs = s.take_errors();
|
|
assert!(
|
|
errs.iter()
|
|
.any(|e| e.starts_with("[string \"this is not lua\"]:1:")),
|
|
"it must not vanish either — the handler channel gets it: {errs:?}"
|
|
);
|
|
}
|
|
|
|
/// `GetLocale` answers one string and `IsMacClient` answers nil — the reference's own shapes
|
|
/// (`binding-shapes.tsv`, both `exact`/`agree`), and the arity is the half a caller branches on.
|
|
#[test]
|
|
fn the_client_identity_pair_answers_its_reference_arity() {
|
|
let s = UiScript::new().unwrap();
|
|
assert_eq!(
|
|
s.arity("GetLocale()").unwrap(),
|
|
1,
|
|
"GetLocale pushes exactly one value"
|
|
);
|
|
assert_eq!(s.eval::<String>("return GetLocale()").unwrap(), "enUS");
|
|
assert_eq!(
|
|
s.arity("IsMacClient()").unwrap(),
|
|
1,
|
|
"IsMacClient pushes one value, and it is nil"
|
|
);
|
|
assert!(
|
|
s.eval::<bool>("return IsMacClient() == nil").unwrap(),
|
|
"nil is the PC arm, which is the arm this client wants"
|
|
);
|
|
}
|
|
}
|