0.1.1

支持 W3X
2026-08-02 19:11:54 +02:00 · 2026-08-02 14:32:18 +02:00
27 changed files with 1949 additions and 219 deletions
@@ -3,3 +3,4 @@ out/
 dist/
 *.vsix
 OpenSAGE/
+debug.log
@@ -18,6 +18,14 @@
 - **引用导航**：从引用值（`CommandSet="..."`、`Weapon="..."`、`inheritFrom`）跳转到定义（严格按引用类型过滤，候选由 `ra3modxml.definitionMode` 控制：`all` 列出 mod + 原版、`project-only` 优先项目内定义）；`Ctrl+点击` Include / `xi:include href` 打开目标文件；Find All References 搜索整个工作区；文档大纲列出顶层资产与 `$DEFINE`。
 - **错误检查**：XML 格式错误、未知元素/属性（`xi:` 等外来命名空间不误报）、顶层资产缺 `id`、重复 ID、未解析引用（含类型不匹配）、Include / 嵌套 `xi:include` 目标找不到、`$DEFINE` 未定义。
 - **manifest 支持**：`<Include type="reference">` 指向的 `static/global/audio.manifest`（SDK `builtmods`）会被解析，manifest 中的原版资产 ID 可用于补全/悬停/导航/诊断。
+- **美术资产（`.w3x`）**：`W3X.xml` / `ART:` include 链中的 `.w3x` 模型文件会被
+  索引（`W3DContainer` / `W3DMesh` / `W3DHierarchy` 等顶层资产），因此
+  `Model@Name`、`Hierarchy`、`Mesh` 等引用可以解析、悬停与跳转。超大模型
+  （几十 MB 的顶点/三角形数据）采用浅扫描——只提取顶层资产记录、不建 DOM 树，
+  结果在 workspace 级缓存并跨重建复用，保存文件触发的重建不会重读未变化的模型文件。
+- **大项目性能**：索引记录（资产 / Define / Include / 行号）与 include 解析结果
+  跨重建缓存，保存触发的重建零 stat、零重读（Corona 实测约 2 秒）；DOM 树只按需
+  保留并设元素预算，避免内存膨胀。

 ## 使用

@@ -72,7 +80,11 @@ src/
    manifestParser.ts     .manifest 二进制解析（移植 OpenSAGE ManifestFile.cs）
    fileScanner.ts        目录扫描与 Include source 候选
    refs.ts               引用目标解析（按引用类型过滤）
-    indexer.ts            工作区索引器（后台、缓存、增量重建）
+    shallowScan.ts        .w3x 等大体积美术资产顶层浅扫描（纯 TS，不建 DOM）
+    records.ts            每文件紧凑索引记录（资产/Define/Include/xi + 行号）
+    caches.ts             跨重建持久缓存（DocumentCache / IndexRecordsCache /
+                          IncludeResolveCache）
+    indexer.ts            工作区索引器（后台、缓存、记录驱动重建）
  features/               completion / hover / navigation / diagnostics / semanticTokens
 syntaxes/                 TextMate 注入语法
 tools/                    XSD → 模型、AssetType 枚举提取
@@ -1 +0,0 @@
-[0801/032923.150:ERROR:third_party\crashpad\crashpad\util\win\registration_protocol_win.cc:108] CreateFile: 拒绝访问。 (0x5)
@@ -590,3 +590,175 @@ token：文档出现解析错误时，由插件用自己的容错解析树继续
  配色，可能与 TextMate XML 配色略有差异——只在打字过程中出现，可接受；
 - 未实现 `provideDocumentSemanticTokensEdits`（delta 版本），每次全量计算；单文件
  解析在 KB 级，开销可忽略。
+
+---
+
+## 十三、问题分析（第八轮，2026-08-02）：`.w3x` 美术资产未被索引（AUGunship_SKN）
+
+### 问题
+
+AttachTest `Harbinger Gunship\GameObject.xml` 中 `<Model Name="AUGunship_SKN"/>`
+报两条错误：
+
+1. Problems 面板诊断：`Unresolved reference "AUGunship_SKN" (not found in the current index)`
+   （`unresolved-reference`，来自 `features/diagnostics.ts`）；
+2. 悬停提示：`No matching definition of type BaseRenderAssetType in the current index
+   (may exist in a compiled manifest or vanilla data).`（来自 `features/hover.ts`）。
+
+两条是同一缺失定义的两种呈现（诊断 + hover），不是两个独立 bug。
+`W3DContainer:AUGunship_SKN` 确实由 mod 定义——但定义在
+`Harbinger Gunship\W3X\AUGUNSHIP_SKN.w3x` 里，而索引器只解析 `.xml` / `.manifestxml`。
+
+### 关键事实（实测）
+
+1. **`.w3x` 是文本 XML**：文件头即 `<?xml ...?>` + `<AssetDeclaration>`，内容为
+   `<W3DContainer id="AUGUNSHIP_SKN" Hierarchy="AUGUNSHIP_SKL">` + `<SubObject>` 子树。
+   附带 UTF-8 BOM（抽样 292 个 Corona w3x：0 个 UTF-16，40 个带 BOM）。
+2. **w3x 通过 `<Include type="all">` 链进索引**：`Mod.xml → … → W3X.xml → W3X/*.w3x`，
+   也常用 `ART:xxx.w3x`（SDK 根、项目 `Art` 等搜索路径）。索引器此前只把 w3x 登记为
+   文件（`stream.files`），从不解析，因此其顶层资产不在 `assetsById` 中。
+3. **类型匹配本来是对的**：`Model@Name` 的 refType 是 `BaseRenderAssetType`，
+   `W3DContainer → BaseRenderAssetType` 可赋值（`isAssignableTo` = true）。缺的只是定义。
+4. **manifest / SageXml 支持早已存在**（第二轮/第三轮），但该资产是 mod 自己的 w3x，
+   不在 `builtmods/*.manifest` 也不在 SageXml——hover 的 "may exist in a compiled manifest
+   or vanilla data" 只是通用兜底文案。
+
+### 规模调查（Corona，D: 盘已连接）
+
+- **3788 个 w3x，共 2.64 GB**；最大 22.8 MB；163 个超过原 4 MB 解析上限，11 个超 10 MB。
+- 大文件结构符合"建模软件导出"模式：顶层是少量固定 W3D 资产
+  （`W3DHierarchy` + 若干 `W3DMesh` / `W3DContainer` / `W3DCollisionBox`，
+  有的还带 `<Includes>` 引用 `ART:*.xml`）；体积大头是 `W3DMesh` 内的
+  `Vertices/V`、`Normals/N`、`TexCoords/T`、`Triangles/T` 等 `maxOccurs="unbounded"`
+  数值元素。例如 21.7 MB 的 `CBRefinery_BLD.W3X` 只有 22 个顶层记录，
+  Vertices+Triangles 块占约 12 MB（55%）。
+- 全量建 DOM 的代价（实测 6.3 MB Aegis 文件）：407 ms、193,651 个元素、
+  **堆内存 +109 MB（约 17 倍文本体积）**；22 MB 文件外推约 1.5 s + ~380 MB/份。
+  浅扫描（只取顶层记录）：6.3 MB ~200 ms、22 MB ~600 ms，保留内存近似为零。
+- **读整个文件不可避免，但建树不是**：浅扫描仍然是线性扫描全文（要知道顶层元素边界
+  就必须扫完），只是不分配子节点对象——所以"事后优化"完全有意义，且是必要项。
+
+### 修复
+
+1. **新增浅扫描模块** `src/indexer/shallowScan.ts`（纯 TS）：
+   单次线性扫描，只提取顶层元素 `name + id`（含精确 offset）、顶层 `<Includes>`
+   的 `Include@type/source`、任意层级 `<xi:include>` 的 `href/xpointer`、`<Defines>`
+   常量；注释 / CDATA / DOCTYPE / PI 整体跳过；属性解析兼容引号内 `>` 与 `/`。
+2. **索引模式三分**：`.xml`/`.manifestxml` 全量解析（4 MB 上限不变）；
+   `.w3x` 一律浅扫描；未知扩展名先嗅探文件头（512 字节，BOM/空白后以 `<` 开头且无
+   NUL 字节 → 按 XML 浅扫描，否则按二进制仅登记）。w3x 自身的 `<Includes>` 与
+   嵌套 `xi:include` 会继续被 walk（BAB 语义）。
+3. **持久缓存**：`DocumentCache` / `ShallowScanCache` 移到 `src/indexer/caches.ts`，
+   由 `ModWorkspace` 持有并传入每次新建的 `ModIndexer`；读取时按 `mtimeMs + size`
+   校验，未变化不重读。这是 w3x 方案在 Corona 上可用的前提（否则每次保存都重读 2.6 GB）。
+4. **BOM 剥离**：`xmlParser` 新增 `stripBom()`，全量解析与浅扫描前统一剥离，
+   保证第一行偏移与编辑器一致。
+5. **Include source 补全候选**：DATA 目录与项目相对路径候选加入 `.w3x`
+   （`fileScanner`），`W3X/xxx.w3x`、`ART/xxx.w3x` 可补全。
+6. 索引报告/状态栏新增 `shallowScannedFiles` / `shallowCacheHits` 统计。
+
+### 验证
+
+- 单元测试 **53 → 63 全绿**：新增 `test/shallowScan.test.mjs`（顶层资产 / Includes /
+  xi:include / Defines / 引号内 `>` / CDATA / 未闭合标签 / 数值载荷不产生记录）；
+  indexer 新增 w3x 链、`.w3d` 嗅探、二进制 `.dds` 跳过、跨重建缓存命中、
+  BOM 偏移断言；xmlParser 新增 `stripBom` 用例。
+- AttachTest 实机：
+  - 首次构建 1.2 s，浅扫 62 个文件；`Model@Name=AUGunship_SKN` →
+    `W3DContainer @ …\W3X\AUGUNSHIP_SKN.w3x:3`；`Hierarchy=AUGunship_SKL`、
+    `AUGunship_FP` 同样解析；资产数 35,546 → 35,607。
+  - 第二次构建 354 ms，0 次重扫，62 次缓存命中。
+- Corona 实机（D: 盘）：
+  - 首次构建 241 s：8,976 个文件、**浅扫 4,829 个**、资产 64,868
+    （manifest 35,322）、3 个流、183 个 Define。
+  - 第二次构建 38 s：0 次重扫、4,829 次缓存命中、资产数一致。
+  - `CBREFINERY_BLD` 正确解析到 `W3DHierarchy @ cb/CBRefinery_BLD.w3x:16` 与
+    `W3DContainer @ …:776412`。
+
+### 边界与后续
+
+- 首次建索引较慢（Corona ~4 分钟，机械盘）：读 2.6 GB 是下限，浅扫描本身 ~30-90 s；
+  后续可做并行扫描或把 w3x 顶层记录做成独立小缓存文件。
+- 第二次构建仍有 ~38 s（主要是对 ~9k 文件逐文件 stat + 重建 Map，机械盘随机读）；
+  后续可做"文件清单 + stat 快照"级缓存。
+- 浅扫描对 w3x 不做 XSD 校验（编辑器特性不注册 w3x 语言）；若用户手动把 `*.w3x`
+  关联为 xml，完整解析仍会发生在打开的文档上（VS Code 自身行为）。
+- UTF-16 XML 的 w3x 会被嗅探判定为二进制（文件头含 NUL）；实测生态中不存在，
+  如遇可再扩展解码。
+
+---
+
+## 十四、问题分析（第九轮，2026-08-02）：Corona 重建性能与内存
+
+### 目标与基线
+
+第八轮后 Corona 的实测基线：
+
+| 场景 | 耗时 |
+|---|---|
+| 首次全量建索引 | ~180-290s（机械盘波动） |
+| 信任二次构建（保存触发） | 8-21s |
+| 强制 reindex | 26-38s |
+| 首建后保留堆 | ~2.5GB（原因不明） |
+
+### 调查 1：二次构建为何仍有 8-21s
+
+插桩 `fs.statSync` 后发现：**每次构建（含信任重建）都会执行约 11 万次同步 statSync**，
+全部来自 `resolveSource` 的 include 目标存在性检查（BAB 搜索路径逐 base `statSync`）。
+机械盘上这就是 10-20s 的来源——即使文件内容全部命中缓存，include 解析仍在逐路径 stat。
+
+修复：新增 `IncludeResolveCache`（workspace 级、跨重建复用）：
+- 键 = 当前文件目录 + source 字符串；命中直接返回，不 stat；
+- 内容编辑不影响"文件是否存在"，因此保存触发的重建**不清除**解析缓存；
+- 文件创建/删除（watcher `onDidCreate` / `onDidDelete`）与 `ra3modxml.reindex`
+  （强制校验）清除缓存；
+- `reference` 的 manifest 查找（`builtmods/*.manifest` 存在性）同样缓存；
+- 配置变更（搜索路径 / builtmods 目录）时清除。
+
+### 调查 2：首建后保留堆 2.5GB 是什么
+
+逐级清空测量（构建 → 清 DOM 缓存 → 清 records → 清 walker → 清索引 Map）：
+
+- `DocumentCache`（元素预算 1M、64 条）：实际只保留 64 条 / 1788 个元素 ≈ 1MB；
+- `IndexRecordsCache`（8976 个文件的紧凑记录）：约 11MB；
+- 目录 walker：约 4MB；
+- 全部索引 Map（manifests + assets + assetsById + defines + files + streams +
+  candidates + diagnostics）：约 75MB；
+- 全部清空并强制 GC 后，堆回到基线（0MB 保留）。
+
+结论：2.5GB 是**构建期可回收垃圾**（60MB XML 的 DOM 瞬态 + 2.6GB w3x 扫描文本/行映射
+的分配压力），不是常驻泄漏；VSCode 正常 GC 压力下会回收。扩展常驻内存约为
+基线 + ~100MB。顺带修复了一个潜在常驻风险：w3x 的 `LineMap`（Corona 全量约 700MB）
+不再随 `ShallowScanCache` 保留，浅扫描结果以"带行号的紧凑记录"形式缓存。
+
+### 其他改动
+
+1. **`IndexRecordsCache` 取代 DOM 依赖的重建**：新增 `src/indexer/records.ts`，
+   每个文件解析时提取紧凑索引记录（顶层资产 / Define / Include / xi:include +
+   1-based 行号），跨重建缓存；信任重建完全不接触 DOM。
+2. **`DocumentCache` 双重淘汰**：条数（LRU）+ 元素预算（超预算先淘汰最大树），
+   把 DOM 常驻内存封顶；DOM 只服务于按需特性（跳转精确范围等）。
+3. **候选目录扫描并行化**（`collectSourceCandidates` 各目录 `Promise.all`）。
+4. **阶段计时**：`stats.candidatesMs` / `stats.walkMs` / `stats.resolveCalls` /
+   `stats.resolveCacheHits` 进入索引报告，便于后续定位耗时。
+5. 版本 0.1.0 → **0.1.1**。
+
+### 实测（Corona，D: 机械盘）
+
+| 场景 | 优化前 | 优化后 |
+|---|---|---|
+| 首次全量建索引 | ~180-290s | ~250s（含 2.6GB w3x 读取+浅扫描、~7.6 万次冷 statSync） |
+| 信任二次构建 | 8-21s | **2.0s**（statSync 0 次，resolveHits 15,333） |
+| 强制 reindex | 26-38s | ~5s（保留解析缓存时）；显式命令会清解析缓存，约 15-25s |
+| 首建后保留堆 | ~2.5GB（疑为泄漏） | 确认是可回收垃圾；常驻 ~100MB |
+
+单元测试 **63 → 73 全绿**：新增 `records.test.mjs`（DOM→记录提取、浅扫描→记录）、
+`caches.test.mjs`（元素预算淘汰、LRU、records/resolve 缓存），indexer 测试补充
+resolve 缓存命中与"信任重建 0 次重解析"断言。
+
+### 遗留
+
+- 首次全量建索引仍受限于机械盘读 2.6GB + 冷 statSync（~4 分钟）；后续可考虑
+  并行浅扫描（worker）或把 w3x 顶层记录持久化到磁盘缓存。
+- `ra3modxml.reindex` 出于正确性会清空解析缓存（可能 ~15-25s）；如接受 watcher
+  可靠性可改为保留。
@@ -85,7 +85,11 @@ src/
    manifestParser.ts  .manifest 二进制解析 + 类型/ID 推导（纯 TS）
    fileScanner.ts     目录遍历缓存 + Include source 候选收集
    refs.ts            引用目标解析（按 refType / isRef / inheritFrom 过滤，纯 TS）
-    indexer.ts         工作区索引器（资产/Define/流/manifest 合并，LRU 解析缓存）
+    shallowScan.ts     大体积美术资产（.w3x 等）顶层浅扫描（纯 TS，不建 DOM）
+    records.ts         每文件紧凑索引记录（资产/Define/Include/xi + 行号）
+    caches.ts          跨重建持久缓存（DocumentCache / IndexRecordsCache /
+                       IncludeResolveCache）
+    indexer.ts         工作区索引器（资产/Define/流/manifest/w3x 合并）
    types.ts           共享类型
  features/
    completion.ts      补全 provider（元素/属性/值，上下文感知；xs:list 多值按当前段过滤）
@@ -109,6 +113,11 @@ test/

 1. **语言激活范围**：不劫持 `*.xml`。通过 `workspaceContains:**/Data/Mod.xml`、`**/*.babproj` 激活；语法高亮为**纯注入** grammar（不声明 `language`，避免覆盖内置 XML 语法）。
 2. **索引范围与默认值**：索引“项目 Data + additionalmaps + 沿 include 可达的 SageXml 原版源码”；SDK 路径默认 `C:\Apps\RA3-MODSDK-X`（可配置）。`reference` include 解析为 `builtmods` 下对应 manifest（惰性解析、按文件缓存），manifest 缺失/无效时回退到占位 XML。
+   **美术资产（.w3x）**：`<Include type="all">` / `ART:` 指向的 `.w3x`（及内容嗅探为
+   XML 的未知扩展名文件）按其顶层资产入库（`W3DContainer` / `W3DMesh` /
+   `W3DHierarchy` / `W3DCollisionBox` 等），使 `Model@Name`、`Hierarchy`、`Mesh`
+   等引用可解析；大模型文件**浅扫描**（不建 DOM），结果缓存在 workspace 级、
+   跨重建复用（详见设计决策 14）。
 3. **manifest 资产建模**：类型优先用哈希表，未知时从名称前缀推导；可引用 ID 取最后冒号段；类型名统一走大小写规范化（`W3dContainer` ↔ `W3DContainer`），类型匹配严格遵循 XSD 继承链。
 4. **上下文感知元素类型**：同名元素按父元素类型解析（`resolveElementType` 沿解析树逐层 `childTypeOf`，失败回退全局映射），保证 `<Weapon>` 等元素的属性/引用判定正确。
 5. **引用判定与解析**：`refType` 或 `isRef` 均视为引用；带 `refType` 时严格按类型过滤（同名 ID 不串类型）；`inheritFrom` 按可继承类型过滤。**局部作用域例外**（`isLocalReferenceAttribute`）：`id` 是元素自身的定义点——无 refType 或 refType 与自身类型兼容时不检查、不解析（`RoadObject@id→Road` 这类跨类型 id 引用保留检查）；Poid 类型属性是管线局部引用，全局索引无法判定，不检查、不解析。
@@ -128,6 +137,33 @@ test/
    XML 编辑器皆然）；扩展注册 `DocumentSemanticTokensProvider`，仅当解析报错时用
    语义 token 覆盖标签名 / 属性名 / 属性值（标准 token 类型 `type` / `property` /
    `string`，主题自带配色）。合法文件返回空，观感与纯 TextMate 完全一致。
+14. **大体积美术资产浅扫描 + 跨重建持久缓存**（第八轮，2026-08-02）：
+    - 实测 Corona：3788 个 w3x / 2.64 GB，163 个超过 4 MB，最大 22.8 MB；大文件是
+      `W3DHierarchy` + 若干 `W3DMesh`（`Vertices/V`、`Triangles/T` 等 unbounded 数值
+      载荷），顶层记录通常只有几个到二十几个。
+    - 全量解析内存放大约 17 倍（6.3 MB 文本 → +109 MB DOM），不可接受；`scanXmlShallow`
+      单次线性扫描只提取顶层 `name+id`、`<Includes>`、`<xi:include>`、`<Defines>`，
+      22 MB 文件 ~600 ms、保留内存≈0。
+    - 索引按扩展名三分：`.xml`/`.manifestxml` 全量解析（4 MB 上限不变）；`.w3x` 浅扫描；
+      未知扩展名嗅探文件头（`<` 开头、无 NUL）决定按 XML 浅扫描或二进制登记。
+    - `DocumentCache` / `ShallowScanCache` 由 `ModWorkspace` 持有，每次重建传入新的
+      `ModIndexer`；按 `mtimeMs + size` 校验，未变化不重读。Corona 第二次构建
+      w3x 重扫数为 0（4,829 次缓存命中）。
+    - 读取整个文件不可避免（顶层边界需要全量扫描），但建 DOM 不是；优化的是
+      "不分配子节点对象"与"跨重建不重读"，两者叠加后方案可行。
+15. **重建零 stat + 记录驱动索引**（第九轮，2026-08-02，v0.1.1）：
+    - 插桩发现每次重建（含信任重建）都有约 11 万次同步 `statSync`
+      （`resolveSource` 的 include 存在性检查），机械盘上占 10-20s；
+      `IncludeResolveCache` 按（目录 + source）缓存解析结果，内容编辑不清、
+      创建/删除文件与强制 reindex 才清。信任重建 statSync 降到 0。
+    - `IndexRecordsCache` 缓存每文件紧凑索引记录（顶层资产 / Define / Include /
+      xi:include + 1-based 行号），信任重建完全不接触 DOM；`DocumentCache`
+      双重淘汰（条数 LRU + 元素预算，超预算先淘汰最大树）把 DOM 常驻内存封顶。
+    - w3x 缓存不再保留 LineMap（Corona 全量约 700MB），浅扫描直接产出带行号的记录。
+    - 实测：Corona 信任二次构建 21s → **2.0s**（statSync 0）；首建后 2.5GB
+      堆保留确认为构建期可回收垃圾，常驻 ~100MB；强制 reindex ~5-25s。
+    - 候选目录扫描并行化；`stats` 新增 `candidatesMs` / `walkMs` / `resolveCalls` /
+      `resolveCacheHits` 供索引报告定位耗时。

 ## 三、实施步骤

@@ -136,22 +172,28 @@ test/
 3. [x] 生成模型：`schema-model.json`（XSD，295 顶层元素 / 1851 类型）与 `asset-types.json`（79 个 AssetType 哈希）。
 4. [x] 纯 TS 核心：include 解析、manifest 解析、XML 解析封装、索引器、引用解析。
 5. [x] 功能层：补全、hover、导航、诊断、大纲、高亮 grammar。
-6. [x] 单测（fixture Mod，53 个用例全绿：含 xs:list 枚举、未闭合引号恢复、list 多值
+6. [x] 单测（fixture Mod，73 个用例全绿：含 xs:list 枚举、未闭合引号恢复、list 多值
   分段、带 vscode stub 的补全集成、语义 token 兜底）+ 编译 + `vsce package` 打包
-   （ra3-mod-xml-0.1.0.vsix，约 495KB）。
-7. [x] 在 AttachTest / GenEvoTest / Corona 上做冒烟验证，并按真实项目反馈修复问题（详见 `docs/analysis-issues.md` 六轮分析）。
+   （ra3-mod-xml-0.1.1.vsix，约 499KB）。
+7. [x] 在 AttachTest / GenEvoTest / Corona 上做冒烟验证，并按真实项目反馈修复问题（详见 `docs/analysis-issues.md` 八轮分析）。
+8. [x] w3x 美术资产索引（第八轮）：新增 `shallowScan.ts` / `caches.ts`，w3x 与内容嗅探
+   XML 走浅扫描，Include source 补全候选加入 w3x，BOM 剥离，缓存跨重建持久化；
+   AttachTest 报错场景（`AUGunship_SKN`）修复，Corona 首次/二次构建实测验证。
+9. [x] Corona 性能与内存优化（第九轮，v0.1.1）：`records.ts` 记录驱动索引、
+   `IncludeResolveCache` 零 stat 重建、DOM 元素预算淘汰、w3x LineMap 移除、
+   候选并行扫描、阶段计时；Corona 信任重建 2.0s；确认首建 2.5GB 为可回收垃圾。

 ## 四、验证结果（实测）

 | 项目 | 规模 | 索引耗时 | 资产数 | 说明 |
 |---|---|---|---|---|
-| AttachTest | 71 文件 | ~0.6s | 35,546（manifest 35,322） | 2 个流（static + mapmetadata） |
-| GenEvoTest | 24 文件 | ~1.8s | 35,392（manifest 35,322） | 项目 ID（alliedmcv 等）正确收录 |
-| Corona | 3,448 文件（+ 非 XML 资产路径） | ~54.5s | 55,305（manifest 35,322） | 3 个流、183 个 Define、0 诊断 |
+| AttachTest | 88 文件 | ~1.2s | 35,607（manifest 35,322，w3x 浅扫 62） | 2 个流（static + mapmetadata）；二次构建 354ms / 62 缓存命中 |
+| GenEvoTest | 66 文件 | 首次 ~2.6s / 二次 ~0.4s | 35,502（manifest 35,322，w3x 浅扫 38） | 2 个流、73 个 Define；二次构建 0 重扫 / 38 缓存命中 |
+| Corona | 8,976 文件 | 首次 ~250s / 信任二次 ~2s / 强制 ~5-25s | 64,868（manifest 35,322，w3x 浅扫 4,829） | 3 个流、183 个 Define、0 诊断；二次构建 statSync 0、resolveHits 15,333 |

 单元测试覆盖：XML 解析（自闭合/容错/偏移/未闭合引号行尾恢复）、补全上下文（未闭合引号仍为 attribute-value、list 多值分段）、补全集成（vscode stub 下 `LocomotorTemplate@Surfaces` 未闭合引号枚举补全、空格后第二段过滤与替换范围）、语义 token（标签/属性/值范围、合法文档返回空、malformed 返回兜底 token）、include 解析（BAB 顺序、SDK 根优先于 SageXml）、manifest 二进制解析（合成 v5 样本、类型/ID 推导）、索引器（资产/Define/流/缺失 include/嵌套 xi:include）、XSD 模型（上下文类型、`childTypeOf`、大小写规范化、属性级 refType、外来命名空间判定、`xs:list` 枚举继承与 `isList` 标记）、引用过滤（`Weapon="X"` 只跳 `WeaponTemplate`、模块 `id` 定义点、Poid 局部引用、`xi:include` 不校验、`Side="Allies"` 命中 manifest 的 `PlayerTemplate`）。

-> 注：`D:\Mods\CoronaMod` 位于移动硬盘，当前未连接；GenEvoTest / Corona 的回归需在 D: 盘可用时补跑（用户会另行通知）。
+> 注：D: 盘移动硬盘已恢复连接；Corona 已在第八 / 九轮按上述新数据回归。

 ## 五、假设与开放问题

@@ -70,6 +70,15 @@ XML 之间的组织靠 `<Include>` 标签，共有三种语义：
  - `TypeId` 哈希 → 类型名的映射来自 OpenSAGE 的 `AssetType` 枚举（本工作区可提取）；
  - 资产名与源文件名各自存放在独立的空字符结尾字符串缓冲区中。

+**补充（美术资产 `.w3x` 索引）**：
+- `W3X.xml` / `ART:` include 链中的 `.w3x` 是文本 XML（建模工具导出，BAB 同样按
+  XML 编译），其顶层资产（`W3DContainer` / `W3DMesh` / `W3DHierarchy` 等）应参与
+  补全、悬停、导航与诊断——`Model@Name`、`Hierarchy`、`Mesh` 等引用依赖这些定义；
+- 大模型文件（实测 Corona 最大 22.8 MB，顶点/三角形数据占大头）采用**顶层浅扫描**
+  （不建 DOM 树），结果在 workspace 级缓存并跨重建复用，避免每次保存都重读整个
+  美术资产目录（Corona 约 2.6 GB）；索引记录与 include 解析结果同样跨重建缓存，
+  保存触发的重建零 stat、零重读（Corona 实测约 2 秒）。
+
 ### P1：非近期目标（本期不做，但预留扩展点）

 6. **高效搜索**：Mod 项目巨大（Corona 约 7500 个 XML、38MB）时直接全文搜索很慢，需要一个高效的 XML 内容索引机制。
@@ -1,12 +1,12 @@
 {
  "name": "ra3-mod-xml",
-  "version": "0.1.0",
+  "version": "0.1.1",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "ra3-mod-xml",
-      "version": "0.1.0",
+      "version": "0.1.1",
      "license": "MIT",
      "dependencies": {
        "fast-xml-parser": "^4.5.0"
@@ -2,7 +2,7 @@
  "name": "ra3-mod-xml",
  "displayName": "RA3 Mod XML",
  "description": "Red Alert 3 Mod XML tooling: syntax highlighting, completions, reference navigation and diagnostics for SAGE/BinaryAssetBuilder XML.",
-  "version": "0.1.0",
+  "version": "0.1.1",
  "publisher": "ra3-mod-xml",
  "license": "MIT",
  "engines": {
@@ -109,18 +109,24 @@ export function activate(context: vscode.ExtensionContext): void {
  context.subscriptions.push(
    vscode.workspace.onDidSaveTextDocument((doc) => {
      if (doc.languageId !== "xml") return;
+      ws.invalidate(doc.uri.fsPath);
      ws.scheduleRebuild();
      void diagnostics.update(doc);
    }),
  );
  context.subscriptions.push(
    vscode.workspace.onDidChangeConfiguration((e) => {
-      if (e.affectsConfiguration("ra3modxml")) ws.scheduleRebuild();
+      if (e.affectsConfiguration("ra3modxml")) {
+        // Search paths / builtmods locations may have changed: cached include
+        // resolutions and manifest lookups are no longer valid.
+        ws.invalidateExistence();
+        ws.scheduleRebuild();
+      }
    }),
  );

  context.subscriptions.push(
-    vscode.commands.registerCommand("ra3modxml.reindex", () => ws.rebuild()),
+    vscode.commands.registerCommand("ra3modxml.reindex", () => ws.rebuild(true)),
  );
  context.subscriptions.push(
    vscode.commands.registerCommand("ra3modxml.openIndexReport", () => {
@@ -135,7 +141,7 @@ export function activate(context: vscode.ExtensionContext): void {
      void vscode.window.showInformationMessage(
        `RA3 Mod XML index\n` +
          `Project: ${s.projectDir}\n` +
-          `Files: ${s.indexedFiles} (${s.parsedFiles} parsed)\n` +
+          `Files: ${s.indexedFiles} (${s.parsedFiles} parsed, ${s.shallowScannedFiles} shallow-scanned, ${s.shallowCacheHits + s.recordsCacheHits} cache hits)\n` +
          `Assets: ${s.assetCount} (${s.manifestAssetCount} from ${s.manifestFiles} manifests)\n` +
          `Defines: ${s.defineCount} · Streams: ${s.streams} · Candidates: ${s.sourceCandidates}\n` +
          `Indexed in ${(s.elapsedMs / 1000).toFixed(1)}s`,
@@ -0,0 +1,226 @@
+/**
+ * Caches shared by the indexer.
+ *
+ * The workspace owns one instance of each cache and passes them into every
+ * ModIndexer, so a rebuild (which creates a fresh indexer) does not re-read
+ * files whose stat (mtime/size) is unchanged. This is what makes indexing
+ * large art-asset corpora (Corona: ~3800 .w3x files, 2.6 GB) practical:
+ * after the first build, save-triggered rebuilds only re-scan files that
+ * actually changed.
+ */
+
+import { resolve } from "node:path";
+import type { IndexedFile, ParsedFile } from "./types";
+import type { IndexRecords } from "./records";
+import type { ResolveResult } from "./includeResolver";
+
+/** Case-insensitive absolute path key. */
+export function normKey(path: string): string {
+  return resolve(path).toLowerCase();
+}
+
+/**
+ * LRU cache for fully parsed XML documents.
+ *
+ * Parse trees of huge mods can be memory-heavy (~17x the source text), so
+ * retention is bounded twice: by entry count (least-recently-used eviction)
+ * and by a total element budget (largest trees are evicted first). Evicted
+ * entries are re-read from disk on demand.
+ */
+export class DocumentCache {
+  private map = new Map<string, ParsedFile>();
+  private totalElements = 0;
+
+  constructor(
+    private capacity = 64,
+    private elementBudget = 2_000_000,
+  ) {}
+
+  get(path: string): ParsedFile | undefined {
+    const key = normKey(path);
+    const hit = this.map.get(key);
+    if (!hit) return undefined;
+    this.map.delete(key);
+    this.map.set(key, hit);
+    return hit;
+  }
+
+  /** Number of cached documents (for diagnostics). */
+  get size(): number {
+    return this.map.size;
+  }
+
+  /** Total elements held by cached parse trees (for diagnostics). */
+  get elements(): number {
+    return this.totalElements;
+  }
+
+  set(parsed: ParsedFile): void {
+    const key = normKey(parsed.file.path);
+    const prev = this.map.get(key);
+    if (prev) this.totalElements -= elementCount(prev);
+    this.map.delete(key);
+    this.map.set(key, parsed);
+    this.totalElements += elementCount(parsed);
+    this.evict();
+  }
+
+  invalidate(path: string): void {
+    const key = normKey(path);
+    const prev = this.map.get(key);
+    if (prev) this.totalElements -= elementCount(prev);
+    this.map.delete(key);
+  }
+
+  clear(): void {
+    this.map.clear();
+    this.totalElements = 0;
+  }
+
+  private evict(): void {
+    while (this.map.size > this.capacity || this.totalElements > this.elementBudget) {
+      if (this.map.size === 0) break;
+      if (this.map.size > this.capacity) {
+        // Over capacity: drop the least recently used entry.
+        const oldest = this.map.keys().next().value;
+        if (oldest === undefined) break;
+        this.remove(oldest);
+      } else {
+        // Over the element budget: drop the largest tree, which frees the
+        // most memory per eviction.
+        let largestKey: string | undefined;
+        let largest = -1;
+        for (const [key, value] of this.map) {
+          const n = elementCount(value);
+          if (n > largest) {
+            largest = n;
+            largestKey = key;
+          }
+        }
+        if (largestKey === undefined || largest <= 0) break;
+        this.remove(largestKey);
+      }
+    }
+  }
+
+  private remove(key: string): void {
+    const prev = this.map.get(key);
+    if (prev) this.totalElements -= elementCount(prev);
+    this.map.delete(key);
+  }
+}
+
+function elementCount(parsed: ParsedFile): number {
+  return parsed.parse?.elements.length ?? 0;
+}
+
+export interface IndexRecordsCacheEntry {
+  stat: IndexedFile["stat"];
+  records: IndexRecords;
+  /** "shallow" for art-asset scans (.w3x), "full" for parsed XML. */
+  kind: "shallow" | "full";
+}
+
+/**
+ * Cache for per-file index records (top-level assets, defines, includes,
+ * xi:include targets). Records are tiny compared to DOM trees or line maps of
+ * multi-megabyte model files, so the capacity comfortably covers a whole mod
+ * (Corona: ~9k files) and rebuilds never re-read unchanged files.
+ */
+export class IndexRecordsCache {
+  private map = new Map<string, IndexRecordsCacheEntry>();
+
+  constructor(private capacity = 16384) {}
+
+  get(path: string): IndexRecordsCacheEntry | undefined {
+    const key = normKey(path);
+    const hit = this.map.get(key);
+    if (!hit) return undefined;
+    this.map.delete(key);
+    this.map.set(key, hit);
+    return hit;
+  }
+
+  /** Number of cached record sets (for diagnostics). */
+  get size(): number {
+    return this.map.size;
+  }
+
+  set(path: string, entry: IndexRecordsCacheEntry): void {
+    const key = normKey(path);
+    this.map.delete(key);
+    this.map.set(key, entry);
+    if (this.map.size > this.capacity) {
+      const oldest = this.map.keys().next().value;
+      if (oldest !== undefined) this.map.delete(oldest);
+    }
+  }
+
+  invalidate(path: string): void {
+    this.map.delete(normKey(path));
+  }
+
+  clear(): void {
+    this.map.clear();
+  }
+}
+
+/**
+ * Cache for Include/@source (and xi:include/@href) resolution results.
+ *
+ * Resolving a source performs synchronous statSync existence checks against
+ * every search base; a Corona build issues ~110k of them (tens of seconds on
+ * a mechanical drive). Content edits never change *existence*, so this cache
+ * survives content rebuilds and is only cleared when files are created or
+ * deleted (or on a forced reindex).
+ */
+export class IncludeResolveCache {
+  private map = new Map<string, ResolveResult>();
+  private manifestMap = new Map<string, string | null>();
+
+  constructor(private capacity = 262144) {}
+
+  get(key: string): ResolveResult | undefined {
+    const hit = this.map.get(key);
+    if (!hit) return undefined;
+    this.map.delete(key);
+    this.map.set(key, hit);
+    return hit;
+  }
+
+  set(key: string, result: ResolveResult): void {
+    this.map.delete(key);
+    this.map.set(key, result);
+    if (this.map.size > this.capacity) {
+      const oldest = this.map.keys().next().value;
+      if (oldest !== undefined) this.map.delete(oldest);
+    }
+  }
+
+  getManifest(key: string): string | null | undefined {
+    const hit = this.manifestMap.get(key);
+    if (hit === undefined) return undefined;
+    this.manifestMap.delete(key);
+    this.manifestMap.set(key, hit);
+    return hit;
+  }
+
+  setManifest(key: string, path: string | null): void {
+    this.manifestMap.delete(key);
+    this.manifestMap.set(key, path);
+    if (this.manifestMap.size > this.capacity) {
+      const oldest = this.manifestMap.keys().next().value;
+      if (oldest !== undefined) this.manifestMap.delete(oldest);
+    }
+  }
+
+  clear(): void {
+    this.map.clear();
+    this.manifestMap.clear();
+  }
+
+  /** Number of cached resolutions (for diagnostics). */
+  get size(): number {
+    return this.map.size;
+  }
+}
@@ -1,7 +1,18 @@
 import { readdir, stat } from "node:fs/promises";
-import { join, relative, resolve } from "node:path";
+import { extname, join, relative, resolve } from "node:path";
 import type { FileWalker, SourceCandidate } from "./types";

+/**
+ * Extensions offered as Include/@source candidates in DATA directories:
+ * regular XML plus art-asset XML (.w3x) that mods include via W3X.xml hubs.
+ * ART/AUDIO directories already list every file.
+ */
+const DATA_CANDIDATE_EXTENSIONS = new Set([".xml", ".w3x"]);
+
+function isDataCandidate(path: string): boolean {
+  return DATA_CANDIDATE_EXTENSIONS.has(extname(path).toLowerCase());
+}
+
 /**
 * Recursive file list walker with a simple directory-mtime cache. Used to
 * enumerate candidate files for Include/@source completion. Directory scans
@@ -76,29 +87,32 @@ export async function collectSourceCandidates(
    out.push({ source, path: resolve(path), prefix, baseDir: resolve(baseDir) });
  };

-  for (const dir of dataDirs) {
-    const files = await walker.listFiles(dir);
+  // List directories in parallel; the walker caches each directory by its
+  // mtime, so rebuilds after the first are still cheap.
+  const [dataLists, artLists, audioLists] = await Promise.all([
+    Promise.all(dataDirs.map(async (dir) => ({ dir, files: await walker.listFiles(dir) }))),
+    Promise.all(artDirs.map(async (dir) => ({ dir, files: await walker.listFiles(dir) }))),
+    Promise.all(audioDirs.map(async (dir) => ({ dir, files: await walker.listFiles(dir) }))),
+  ]);
+
+  for (const { dir, files } of dataLists) {
    for (const f of files) {
-      if (!f.toLowerCase().endsWith(".xml")) continue;
+      if (!isDataCandidate(f)) continue;
      add(f, dir, "DATA");
    }
    if (samePath(dir, projectDataDir)) {
      // Also offer project-relative paths (what Mod.xml itself uses).
      for (const f of files) {
-        if (f.toLowerCase().endsWith(".xml")) add(f, projectDataDir, null);
+        if (isDataCandidate(f)) add(f, projectDataDir, null);
      }
    }
  }

-  for (const dir of artDirs) {
-    for (const f of await walker.listFiles(dir)) {
-      add(f, dir, "ART");
-    }
+  for (const { dir, files } of artLists) {
+    for (const f of files) add(f, dir, "ART");
  }
-  for (const dir of audioDirs) {
-    for (const f of await walker.listFiles(dir)) {
-      add(f, dir, "AUDIO");
-    }
+  for (const { dir, files } of audioLists) {
+    for (const f of files) add(f, dir, "AUDIO");
  }

  return out;
@@ -11,13 +11,21 @@
 * outside the extension.
 */

-import { readFile, readdir, stat } from "node:fs/promises";
+import { open, readFile, readdir, stat } from "node:fs/promises";
+import type { Stats } from "node:fs";
 import { basename, dirname, extname, join, resolve } from "node:path";
-import { LineMap, parseXml, type XmlDocument, type XmlElement } from "../language/xmlParser";
+import {
+  LineMap,
+  parseXml,
+  stripBom,
+  type XmlDocument,
+  type XmlElement,
+} from "../language/xmlParser";
 import {
  buildSearchPaths,
  manifestPathForReference,
  resolveSource,
+  type ResolveResult,
  type SearchPaths,
 } from "./includeResolver";
 import {
@@ -28,6 +36,14 @@ import {
 } from "./manifestParser";
 import { canonicalTypeName } from "../model/schemaModel";
 import { collectSourceCandidates } from "./fileScanner";
+import { DocumentCache, IncludeResolveCache, IndexRecordsCache, normKey } from "./caches";
+import type { IndexRecordsCacheEntry } from "./caches";
+import { scanXmlShallow } from "./shallowScan";
+import {
+  extractIndexRecords,
+  recordsFromShallow,
+  type IndexRecordXi,
+} from "./records";
 import type {
  AssetDef,
  DefineDef,
@@ -42,54 +58,35 @@ import type {
 const MAX_DEPTH = 300;
 /** Files above this size are never parsed (safety against binary blobs). */
 const MAX_PARSE_BYTES = 4 * 1024 * 1024;
-/** Only these extensions are treated as XML documents. */
-const XML_EXTENSIONS = new Set([".xml", ".manifestxml"]);
-
-function normKey(path: string): string {
-  return resolve(path).toLowerCase();
-}
-
 /**
- * LRU cache for parsed documents. The parse trees of huge mods can be
- * memory-heavy, so only a bounded number of recent documents is retained;
- * evicted entries are re-read from disk on demand.
+ * Fully parsed XML documents. `.xml` / `.manifestxml` files are small enough
+ * that a full DOM is affordable.
 */
-export class DocumentCache {
-  private map = new Map<string, ParsedFile>();
+const FULL_XML_EXTENSIONS = new Set([".xml", ".manifestxml"]);
+/**
+ * XML documents whose top-level structure is all the index needs (art-asset
+ * files exported by modeling tools, e.g. .w3x). They are shallow-scanned so
+ * multi-megabyte vertex/triangle payloads never become a DOM.
+ */
+const SHALLOW_XML_EXTENSIONS = new Set([".w3x"]);
+/** Bytes peeked when deciding whether an unknown extension is XML text. */
+const SNIFF_BYTES = 512;

-  constructor(private capacity = 64) {}
-
-  get(path: string): ParsedFile | undefined {
-    const key = normKey(path);
-    const hit = this.map.get(key);
-    if (!hit) return undefined;
-    this.map.delete(key);
-    this.map.set(key, hit);
-    return hit;
-  }
-
-  set(parsed: ParsedFile): void {
-    const key = normKey(parsed.file.path);
-    this.map.delete(key);
-    this.map.set(key, parsed);
-    if (this.map.size > this.capacity) {
-      const oldest = this.map.keys().next().value;
-      if (oldest !== undefined) this.map.delete(oldest);
-    }
-  }
-
-  invalidate(path: string): void {
-    this.map.delete(normKey(path));
-  }
-
-  clear(): void {
-    this.map.clear();
-  }
-}
+type XmlMode = "full" | "shallow" | "binary";

 export class ModIndexer {
  private searchPaths: SearchPaths;
-  private docs = new DocumentCache();
+  private docs: DocumentCache;
+  private recordsCache: IndexRecordsCache;
+  private resolveCache: IncludeResolveCache;
+  private scanCounters = {
+    shallowScannedFiles: 0,
+    shallowCacheHits: 0,
+    recordsCacheHits: 0,
+    resolveCacheHits: 0,
+    resolveCalls: 0,
+  };
+  private phase = { candidatesMs: 0, walkMs: 0 };
  private assets = new Map<string, Map<string, AssetDef[]>>();
  private assetsById = new Map<string, AssetDef[]>();
  private defines = new Map<string, DefineDef[]>();
@@ -106,42 +103,221 @@ export class ModIndexer {
    this.searchPaths = buildSearchPaths(opts.sdkDir, opts.projectDir, {
      DATA: opts.additionalDataSearchPaths,
    });
+    // Caches may be owned by the workspace so they survive rebuilds.
+    this.docs = opts.documentCache ?? new DocumentCache();
+    this.recordsCache = opts.recordsCache ?? new IndexRecordsCache();
+    this.resolveCache = opts.resolveCache ?? new IncludeResolveCache();
  }

-  /** Re-reads and caches a document; null when unreadable. */
+  /**
+   * Returns a document for indexing/navigation:
+   * - `.xml` / `.manifestxml` files are fully parsed (bounded by
+   *   MAX_PARSE_BYTES);
+   * - `.w3x` (and unknown-extension files whose content looks like XML) are
+   *   shallow-scanned, so huge model files never become a DOM;
+   * - everything else is registered as a file but never parsed.
+   *
+   * Cached entries are reused when the file stat is unchanged, which lets a
+   * workspace-owned cache survive rebuilds.
+   */
  async readDocument(path: string): Promise<ParsedFile | null> {
-    const hit = this.docs.get(path);
-    if (hit) return hit;
+    const key = normKey(path);
+    const trust =
+      this.opts.trustUnchanged === true && !this.opts.changedFiles?.has(key);
+
+    // Trusted fast path: a file that the watcher has not reported as changed
+    // is reused without any stat / content sniff / read at all. This is what
+    // makes save-triggered rebuilds cheap on huge corpora (Corona: ~9k files,
+    // ~2.6 GB of art assets on a mechanical drive).
+    if (trust) {
+      const rec = this.recordsCache.get(key);
+      if (rec) return this.recordsParsed(path, rec);
+      const cached = this.docs.get(key);
+      if (cached) {
+        this.files.set(key, cached.file);
+        return cached;
+      }
+    }
+
+    // Untrusted / cache miss: verify the stat against caches, then read.
    try {
-      const [st, text] = await Promise.all([stat(path), readFile(path, "utf8")]);
-      if (st.size > MAX_PARSE_BYTES) {
+      const st = await stat(path);
+      const rec = this.recordsCache.get(key);
+      if (rec?.stat && rec.stat.mtimeMs === st.mtimeMs && rec.stat.size === st.size) {
+        return this.recordsParsed(path, rec);
+      }
+      const hit = this.docs.get(key);
+      if (
+        hit?.file.stat &&
+        hit.file.stat.mtimeMs === st.mtimeMs &&
+        hit.file.stat.size === st.size
+      ) {
+        this.files.set(key, hit.file);
+        return hit;
+      }
+      const mode = await this.detectXmlMode(path);
+      if (mode === "shallow") return this.scanShallow(path, st);
+      if (mode === "binary") {
        const file: IndexedFile = { path: resolve(path), stat: { mtimeMs: st.mtimeMs, size: st.size } };
-        const parsed: ParsedFile = { file, parse: null, lineMap: null };
+        const parsed: ParsedFile = { file, parse: null, records: null, lineMap: null };
        this.docs.set(parsed);
-        this.files.set(normKey(parsed.file.path), file);
+        this.files.set(key, file);
        return parsed;
      }
+      if (st.size > MAX_PARSE_BYTES) {
+        const file: IndexedFile = { path: resolve(path), stat: { mtimeMs: st.mtimeMs, size: st.size } };
+        const parsed: ParsedFile = { file, parse: null, records: null, lineMap: null };
+        this.docs.set(parsed);
+        this.files.set(key, file);
+        return parsed;
+      }
+      const text = stripBom(await readFile(path, "utf8"));
+      const lineMap = new LineMap(text);
      const parse = parseXml(text);
+      const records = extractIndexRecords(parse, lineMap);
      const parsed: ParsedFile = {
        file: { path: resolve(path), stat: { mtimeMs: st.mtimeMs, size: st.size } },
        parse,
-        lineMap: new LineMap(text),
+        records,
+        lineMap,
      };
      this.docs.set(parsed);
-      this.files.set(normKey(parsed.file.path), parsed.file);
+      this.recordsCache.set(key, { stat: parsed.file.stat, records, kind: "full" });
+      this.files.set(key, parsed.file);
      return parsed;
    } catch {
      const parsed: ParsedFile = {
        file: { path: resolve(path), stat: null },
        parse: null,
+        records: null,
        lineMap: null,
      };
      this.docs.set(parsed);
-      this.files.set(normKey(parsed.file.path), parsed.file);
+      this.files.set(key, parsed.file);
      return parsed;
    }
  }

+  /**
+   * Shallow-scans a large art-asset XML document (no DOM built) and caches
+   * its compact index records. The transient LineMap used to compute record
+   * lines is discarded, so the cache never retains megabytes of line offsets
+   * for model files (Corona w3x alone would otherwise keep ~700 MB).
+   */
+  private async scanShallow(path: string, st: Stats): Promise<ParsedFile | null> {
+    const key = normKey(path);
+    try {
+      const text = stripBom(await readFile(path, "utf8"));
+      const lineMap = new LineMap(text);
+      const records = recordsFromShallow(scanXmlShallow(text), lineMap);
+      const parsed: ParsedFile = {
+        file: { path: resolve(path), stat: { mtimeMs: st.mtimeMs, size: st.size } },
+        parse: null,
+        records,
+        lineMap: null,
+      };
+      this.recordsCache.set(key, { stat: parsed.file.stat, records, kind: "shallow" });
+      this.files.set(key, parsed.file);
+      this.scanCounters.shallowScannedFiles++;
+      return parsed;
+    } catch {
+      return null;
+    }
+  }
+
+  /** Builds a lean ParsedFile from cached index records (no DOM / line map). */
+  private recordsParsed(path: string, entry: IndexRecordsCacheEntry): ParsedFile {
+    if (entry.kind === "shallow") this.scanCounters.shallowCacheHits++;
+    else this.scanCounters.recordsCacheHits++;
+    const file: IndexedFile = { path: resolve(path), stat: entry.stat };
+    this.files.set(normKey(path), file);
+    return { file, parse: null, records: entry.records, lineMap: null };
+  }
+
+  /**
+   * Reads a document and guarantees a DOM parse tree. Used only for
+   * root-level <xi:include> xpointer selection (rare), where the target's
+   * container children are needed.
+   */
+  private async readDom(path: string): Promise<ParsedFile | null> {
+    const key = normKey(path);
+    const cached = this.docs.get(key);
+    if (cached?.parse?.root) {
+      this.files.set(key, cached.file);
+      return cached;
+    }
+    try {
+      const st = await stat(path);
+      const hit = this.docs.get(key);
+      if (
+        hit?.parse?.root &&
+        hit.file.stat &&
+        hit.file.stat.mtimeMs === st.mtimeMs &&
+        hit.file.stat.size === st.size
+      ) {
+        this.files.set(key, hit.file);
+        return hit;
+      }
+      if (st.size > MAX_PARSE_BYTES) return null;
+      const text = stripBom(await readFile(path, "utf8"));
+      const lineMap = new LineMap(text);
+      const parse = parseXml(text);
+      const records = extractIndexRecords(parse, lineMap);
+      const parsed: ParsedFile = {
+        file: { path: resolve(path), stat: { mtimeMs: st.mtimeMs, size: st.size } },
+        parse,
+        records,
+        lineMap,
+      };
+      this.docs.set(parsed);
+      this.recordsCache.set(key, { stat: parsed.file.stat, records, kind: "full" });
+      this.files.set(key, parsed.file);
+      return parsed;
+    } catch {
+      return null;
+    }
+  }
+
+  /** Decides how a resolved include target should be consumed. */
+  private async detectXmlMode(path: string): Promise<XmlMode> {
+    const ext = extname(path).toLowerCase();
+    if (FULL_XML_EXTENSIONS.has(ext)) return "full";
+    if (SHALLOW_XML_EXTENSIONS.has(ext)) return "shallow";
+    return (await looksLikeXml(path)) ? "shallow" : "binary";
+  }
+
+  /**
+   * Resolves an include source through the cross-rebuild cache. Existence
+   * does not change on content edits, so trusted rebuilds pay zero statSync
+   * for include resolution (Corona does ~110k checks per build otherwise).
+   */
+  private resolveCached(source: string, currentDir: string | null): ResolveResult {
+    const key = `${normKey(currentDir ?? "")}\u0000${source}`;
+    const hit = this.resolveCache.get(key);
+    if (hit) {
+      this.scanCounters.resolveCacheHits++;
+      return hit;
+    }
+    this.scanCounters.resolveCalls++;
+    const result = resolveSource(source, currentDir, this.searchPaths);
+    this.resolveCache.set(key, result);
+    return result;
+  }
+
+  /** Cached manifest lookup for `reference` includes. */
+  private manifestPathCached(source: string): string | null {
+    const key = source.toLowerCase();
+    const hit = this.resolveCache.getManifest(key);
+    if (hit !== undefined) {
+      this.scanCounters.resolveCacheHits++;
+      return hit;
+    }
+    this.scanCounters.resolveCalls++;
+    const path = manifestPathForReference(source, this.opts.builtmodsDirs);
+    this.resolveCache.setManifest(key, path);
+    return path;
+  }
+
  /** Returns the cached parse if present (does not read from disk). */
  cachedDocument(path: string): ParsedFile | undefined {
    return this.docs.get(path);
@@ -155,6 +331,7 @@ export class ModIndexer {
      : null;

    // ── Streams ──
+    const walkStart = Date.now();
    const staticEntry = projectData ? join(projectData, "Mod.xml") : null;
    if (staticEntry) {
      const stream: StreamInfo = { name: "static", entry: staticEntry, files: new Set() };
@@ -183,8 +360,10 @@ export class ModIndexer {
        await this.walk(entry, "all", stream, 0);
      }
    }
+    this.phase.walkMs = Date.now() - walkStart;

    // ── Source completion candidates ──
+    const candidatesStart = Date.now();
    const dataDirs = [
      projectData ?? join(this.opts.projectDir, "Data"),
      join(this.opts.sdkDir, "SageXml"),
@@ -229,6 +408,7 @@ export class ModIndexer {
      ...sdkRootCandidates,
      ...this.sourceCandidates,
    ]);
+    this.phase.candidatesMs = Date.now() - candidatesStart;

    const manifestAssetCount = [...this.manifests.values()].reduce(
      (sum, m) => sum + m.assets.length,
@@ -253,6 +433,13 @@ export class ModIndexer {
        parsedFiles: [...this.files.values()].filter(
          (f) => f.stat != null && f.stat.size <= MAX_PARSE_BYTES,
        ).length,
+        shallowScannedFiles: this.scanCounters.shallowScannedFiles,
+        shallowCacheHits: this.scanCounters.shallowCacheHits,
+        recordsCacheHits: this.scanCounters.recordsCacheHits,
+        resolveCacheHits: this.scanCounters.resolveCacheHits,
+        resolveCalls: this.scanCounters.resolveCalls,
+        candidatesMs: this.phase.candidatesMs,
+        walkMs: this.phase.walkMs,
        assetCount: [...this.assets.values()].reduce((sum, byId) => sum + byId.size, 0),
        defineCount: this.defines.size,
        manifestFiles: this.manifests.size,
@@ -294,166 +481,160 @@ export class ModIndexer {

    stream.files.add(key);

-    // Binary assets (w3x/dds/...) are referenced but never parsed.
-    if (!isXmlPath(path)) return;
-
+    // readDocument returns compact index records for every indexable XML
+    // document (full parse or shallow scan), or a bare file registration
+    // for binary / unparseable targets.
    const parsed = await this.readDocument(path);
-    if (!parsed?.parse?.root) return;
-    const root = parsed.parse.root;
+    if (!parsed) return;
+    if (parsed.records) {
+      await this.applyRecords(parsed, stream, depth, mode === "instance");
+      return;
+    }
+  }

-    for (const child of root.children) {
-      const local = localName(child.name);
-      if (local === "Tags" || local === "Includes" || local === "Defines") continue;
-      if (local === "include") {
-        await this.handleXiInclude(child, parsed, stream, depth);
-        continue;
-      }
-      const idAttr = child.attrs.find((a) => a.name === "id");
-      if (idAttr) {
-        this.addAsset({
-          type: local,
-          id: idAttr.value,
-          file: parsed.file.path,
-          line: lineOf(parsed, idAttr.valueStart),
-          origin: this.originOf(parsed.file.path),
-          stream: stream.name,
-          viaInstance: mode === "instance",
-        });
-      }
+  /**
+   * Applies a document's compact index records: top-level assets, defines,
+   * <Includes>, nested <xi:include> and root-level <xi:include> targets.
+   * Works identically for fully parsed XML and shallow-scanned art assets.
+   */
+  private async applyRecords(
+    parsed: ParsedFile,
+    stream: StreamInfo,
+    depth: number,
+    viaInstance: boolean,
+  ): Promise<void> {
+    const records = parsed.records;
+    if (!records) return;
+    const file = parsed.file.path;
+    const origin = this.originOf(file);
+
+    for (const asset of records.assets) {
+      this.addAsset({
+        type: asset.type,
+        id: asset.id,
+        file,
+        line: asset.line,
+        origin,
+        stream: stream.name,
+        viaInstance,
+      });
    }

-    for (const child of root.children) {
-      if (localName(child.name) !== "Defines") continue;
-      for (const define of child.children) {
-        if (localName(define.name) !== "Define") continue;
-        const name = define.attrs.find((a) => a.name === "name")?.value;
-        const value = define.attrs.find((a) => a.name === "value")?.value;
-        if (!name) continue;
-        const entry: DefineDef = {
-          name,
-          value: value ?? "",
-          file: parsed.file.path,
-          line: lineOf(parsed, define.start),
-          origin: this.originOf(parsed.file.path),
-        };
-        const arr = this.defines.get(name.toLowerCase());
-        if (arr) arr.push(entry);
-        else this.defines.set(name.toLowerCase(), [entry]);
-      }
+    for (const define of records.defines) {
+      const entry: DefineDef = {
+        name: define.name,
+        value: define.value,
+        file,
+        line: define.line,
+        origin,
+      };
+      const arr = this.defines.get(define.name.toLowerCase());
+      if (arr) arr.push(entry);
+      else this.defines.set(define.name.toLowerCase(), [entry]);
    }

-    const includesElem = root.children.find((c) => localName(c.name) === "Includes");
-    if (includesElem) {
-      for (const inc of includesElem.children) {
-        if (localName(inc.name) !== "Include") continue;
-        const type = inc.attrs.find((a) => a.name === "type")?.value;
-        const source = inc.attrs.find((a) => a.name === "source")?.value;
-        if (!source) continue;
-        const resolved = resolveSource(source, dirname(parsed.file.path), this.searchPaths);
-        if (!resolved.path) {
-          this.diagnostics.push({
-            file: parsed.file.path,
-            line: lineOf(parsed, inc.start),
-            message: `Include target not found: ${source}`,
-            severity: "warning",
-            code: "include-not-found",
-          });
-          continue;
-        }
-        if (type === "all" || type === "instance") {
-          await this.walk(resolved.path, type === "all" ? "all" : "instance", stream, depth + 1);
-        } else if (type === "reference") {
-          const manifestPath = manifestPathForReference(source, this.opts.builtmodsDirs);
-          if (manifestPath) {
-            const loaded = await this.loadManifest(manifestPath, stream.name);
-            if (!loaded && isXmlPath(resolved.path)) {
-              // The manifest could not be parsed (missing/invalid): fall back
-              // to the placeholder XML so its content is still available.
-              await this.walk(resolved.path, "instance", stream, depth + 1);
-            }
-          } else if (isXmlPath(resolved.path)) {
-            // reference to a real XML file: treat its assets as available
-            await this.walk(resolved.path, "instance", stream, depth + 1);
-          }
-        }
-      }
-    }
-
-    // Nested <xi:include> anywhere in the tree (not just under the root):
-    // the target content is inlined into the parent element. We make the
-    // target file available and surface missing targets instead of ignoring
-    // them silently.
-    for (const el of parsed.parse.elements) {
-      if (localName(el.name) !== "include") continue;
-      if (el.parent === root) continue; // already handled in the loop above
-      const href = el.attrs.find((a) => a.name === "href")?.value;
-      if (!href) continue;
-      const resolved = resolveSource(href, dirname(parsed.file.path), this.searchPaths);
+    for (const inc of records.includes) {
+      const resolved = this.resolveCached(inc.source, dirname(file));
      if (!resolved.path) {
        this.diagnostics.push({
-          file: parsed.file.path,
-          line: lineOf(parsed, el.start),
-          message: `xi:include target not found: ${href}`,
+          file,
+          line: inc.line,
+          message: `Include target not found: ${inc.source}`,
+          severity: "warning",
+          code: "include-not-found",
+        });
+        continue;
+      }
+      if (inc.type === "all" || inc.type === "instance") {
+        await this.walk(
+          resolved.path,
+          inc.type === "all" ? "all" : "instance",
+          stream,
+          depth + 1,
+        );
+      } else if (inc.type === "reference") {
+        const manifestPath = this.manifestPathCached(inc.source);
+        if (manifestPath) {
+          const loaded = await this.loadManifest(manifestPath, stream.name);
+          if (!loaded) await this.walk(resolved.path, "instance", stream, depth + 1);
+        } else {
+          await this.walk(resolved.path, "instance", stream, depth + 1);
+        }
+      }
+    }
+
+    for (const xi of records.nestedXiIncludes) {
+      const resolved = this.resolveCached(xi.href, dirname(file));
+      if (!resolved.path) {
+        this.diagnostics.push({
+          file,
+          line: xi.line,
+          message: `xi:include target not found: ${xi.href}`,
          severity: "warning",
          code: "include-not-found",
        });
        continue;
      }
      stream.files.add(normKey(resolved.path));
-      if (isXmlPath(resolved.path)) {
-        await this.walk(resolved.path, "all", stream, depth + 1);
-      }
+      await this.walk(resolved.path, "all", stream, depth + 1);
+    }
+
+    for (const xi of records.rootXiIncludes) {
+      await this.handleRootXiInclude(xi, file, stream, depth);
    }
  }

-  private async handleXiInclude(
-    xi: XmlElement,
-    parent: ParsedFile,
+  /**
+   * Root-level <xi:include> with an xpointer selects a named container's
+   * children in the target document, so the target's DOM is needed. These
+   * targets are rare, so they are parsed on demand (the tree is also cached).
+   */
+  private async handleRootXiInclude(
+    xi: IndexRecordXi,
+    parentFile: string,
    stream: StreamInfo,
    depth: number,
  ): Promise<void> {
-    const href = xi.attrs.find((a) => a.name === "href")?.value;
-    if (!href) return;
-    const resolved = resolveSource(href, dirname(parent.file.path), this.searchPaths);
+    const resolved = this.resolveCached(xi.href, dirname(parentFile));
    if (!resolved.path) {
      this.diagnostics.push({
-        file: parent.file.path,
-        line: lineOf(parent, xi.start),
-        message: `xi:include target not found: ${href}`,
+        file: parentFile,
+        line: xi.line,
+        message: `xi:include target not found: ${xi.href}`,
        severity: "warning",
        code: "include-not-found",
      });
      return;
    }
-    if (!isXmlPath(resolved.path)) return;
-    const target = await this.readDocument(resolved.path);
-    if (!target?.parse?.root) return;

-    const xpointer = xi.attrs.find((a) => a.name === "xpointer")?.value ?? "";
-    let candidates: XmlElement[];
-    if (xpointer) {
-      const container = findXPointerContainer(target.parse, xpointer);
-      candidates = container ? container.children : [];
-    } else {
-      candidates = target.parse.root.children;
-    }
-    for (const el of candidates) {
-      const local = localName(el.name);
-      if (local === "Tags" || local === "Includes" || local === "Defines") continue;
-      const idAttr = el.attrs.find((a) => a.name === "id");
-      if (idAttr) {
-        this.addAsset({
-          type: local,
-          id: idAttr.value,
-          file: target.file.path,
-          line: lineOf(target, idAttr.valueStart),
-          origin: this.originOf(target.file.path),
-          stream: stream.name,
-        });
+    const target = await this.readDom(resolved.path);
+    if (target?.parse?.root) {
+      const xpointer = xi.xpointer ?? "";
+      let candidates: XmlElement[];
+      if (xpointer) {
+        const container = findXPointerContainer(target.parse, xpointer);
+        candidates = container ? container.children : [];
+      } else {
+        candidates = target.parse.root.children;
+      }
+      for (const el of candidates) {
+        const local = localName(el.name);
+        if (local === "Tags" || local === "Includes" || local === "Defines") continue;
+        const idAttr = el.attrs.find((a) => a.name === "id");
+        if (idAttr) {
+          this.addAsset({
+            type: local,
+            id: idAttr.value,
+            file: target.file.path,
+            line: lineOf(target, idAttr.valueStart),
+            origin: this.originOf(target.file.path),
+            stream: stream.name,
+          });
+        }
      }
    }
-    stream.files.add(normKey(target.file.path));
-    await this.walk(target.file.path, "all", stream, depth + 1);
+    stream.files.add(normKey(resolved.path));
+    await this.walk(resolved.path, "all", stream, depth + 1);
  }

  // ── Manifest loading ──────────────────────────────────────────────
@@ -551,9 +732,32 @@ function lineOf(parsed: ParsedFile, offset: number): number {
  return parsed.lineMap.positionAt(offset).line + 1;
 }

-function isXmlPath(path: string): boolean {
-  const ext = extname(path).toLowerCase();
-  return XML_EXTENSIONS.has(ext);
+/**
+ * Content sniffing for include targets with unknown extensions (e.g. art
+ * formats beyond .w3x): a small header that starts with "<" after an
+ * optional UTF-8 BOM / whitespace and contains no NUL bytes is treated as
+ * XML text; anything else is a binary asset (registered, never parsed).
+ */
+async function looksLikeXml(path: string): Promise<boolean> {
+  try {
+    const fh = await open(path, "r");
+    try {
+      const buf = Buffer.alloc(SNIFF_BYTES);
+      const { bytesRead } = await fh.read(buf, 0, SNIFF_BYTES, 0);
+      const head = buf.subarray(0, bytesRead);
+      if (head.includes(0)) return false;
+      let i = 0;
+      if (head[0] === 0xef && head[1] === 0xbb && head[2] === 0xbf) i = 3;
+      while (i < head.length && (head[i] === 0x20 || head[i] === 0x09 || head[i] === 0x0a || head[i] === 0x0d)) {
+        i++;
+      }
+      return i < head.length && head[i] === 0x3c; // "<"
+    } finally {
+      await fh.close();
+    }
+  } catch {
+    return false;
+  }
 }

 async function findCaseInsensitiveDir(dir: string): Promise<string | null> {
@@ -0,0 +1,177 @@
+/**
+ * Compact per-file index records.
+ *
+ * A rebuild only needs each file's top-level assets, defines, includes and
+ * xi:include targets — not the DOM. Extracting these records at parse time
+ * and caching them across rebuilds lets Corona-scale rebuilds skip both the
+ * DOM and the file I/O for unchanged files, while keeping the DOM cache small
+ * for on-demand features (hover / navigation / outline).
+ *
+ * Pure TypeScript: no vscode dependency.
+ */
+
+import type { LineMap, XmlDocument } from "../language/xmlParser";
+import type { ShallowDocument } from "./shallowScan";
+
+export interface IndexRecordAsset {
+  /** Top-level element name, e.g. "W3DContainer". */
+  type: string;
+  id: string;
+  /** 1-based line of the id attribute value. */
+  line: number;
+}
+
+export interface IndexRecordDefine {
+  name: string;
+  value: string;
+  /** 1-based line of the <Define> element. */
+  line: number;
+}
+
+export interface IndexRecordInclude {
+  type: "all" | "instance" | "reference" | null;
+  source: string;
+  /** 1-based line of the <Include> element. */
+  line: number;
+}
+
+export interface IndexRecordXi {
+  href: string;
+  xpointer: string | null;
+  /** 1-based line of the <xi:include> element. */
+  line: number;
+}
+
+export interface IndexRecords {
+  assets: IndexRecordAsset[];
+  defines: IndexRecordDefine[];
+  includes: IndexRecordInclude[];
+  /** <xi:include> elements that are direct children of the root. */
+  rootXiIncludes: IndexRecordXi[];
+  /** <xi:include> elements nested anywhere else in the document. */
+  nestedXiIncludes: IndexRecordXi[];
+}
+
+const INCLUDE_TYPES = new Set(["all", "instance", "reference"]);
+
+function lineOf(lineMap: LineMap, offset: number): number {
+  return lineMap.positionAt(offset).line + 1;
+}
+
+function localName(tag: string): string {
+  const idx = tag.lastIndexOf(":");
+  return idx >= 0 ? tag.slice(idx + 1) : tag;
+}
+
+/**
+ * Extracts the index records of a fully parsed document. Mirrors the walk
+ * semantics of the indexer exactly: top-level assets (excluding
+ * Tags/Includes/Defines), $DEFINE constants, the top-level <Includes> block
+ * and root/nested <xi:include> elements.
+ */
+export function extractIndexRecords(parse: XmlDocument, lineMap: LineMap): IndexRecords {
+  const assets: IndexRecordAsset[] = [];
+  const defines: IndexRecordDefine[] = [];
+  const includes: IndexRecordInclude[] = [];
+  const rootXiIncludes: IndexRecordXi[] = [];
+  const nestedXiIncludes: IndexRecordXi[] = [];
+  const root = parse.root;
+  if (!root) return { assets, defines, includes, rootXiIncludes, nestedXiIncludes };
+
+  for (const child of root.children) {
+    const local = localName(child.name);
+    if (local === "Tags" || local === "Includes" || local === "Defines") continue;
+    if (local === "include") {
+      const href = child.attrs.find((a) => a.name === "href")?.value;
+      if (href) {
+        rootXiIncludes.push({
+          href,
+          xpointer: child.attrs.find((a) => a.name === "xpointer")?.value ?? null,
+          line: lineOf(lineMap, child.start),
+        });
+      }
+      continue;
+    }
+    const idAttr = child.attrs.find((a) => a.name === "id");
+    if (idAttr) {
+      assets.push({ type: local, id: idAttr.value, line: lineOf(lineMap, idAttr.valueStart) });
+    }
+  }
+
+  for (const child of root.children) {
+    if (localName(child.name) !== "Defines") continue;
+    for (const define of child.children) {
+      if (localName(define.name) !== "Define") continue;
+      const name = define.attrs.find((a) => a.name === "name")?.value;
+      if (!name) continue;
+      defines.push({
+        name,
+        value: define.attrs.find((a) => a.name === "value")?.value ?? "",
+        line: lineOf(lineMap, define.start),
+      });
+    }
+  }
+
+  const includesElem = root.children.find((c) => localName(c.name) === "Includes");
+  if (includesElem) {
+    for (const inc of includesElem.children) {
+      if (localName(inc.name) !== "Include") continue;
+      const source = inc.attrs.find((a) => a.name === "source")?.value;
+      if (!source) continue;
+      const type = inc.attrs.find((a) => a.name === "type")?.value;
+      includes.push({
+        type:
+          type && INCLUDE_TYPES.has(type)
+            ? (type as "all" | "instance" | "reference")
+            : null,
+        source,
+        line: lineOf(lineMap, inc.start),
+      });
+    }
+  }
+
+  for (const el of parse.elements) {
+    if (localName(el.name) !== "include") continue;
+    if (el.parent === root) continue; // already handled above
+    const href = el.attrs.find((a) => a.name === "href")?.value;
+    if (!href) continue;
+    nestedXiIncludes.push({
+      href,
+      xpointer: el.attrs.find((a) => a.name === "xpointer")?.value ?? null,
+      line: lineOf(lineMap, el.start),
+    });
+  }
+
+  return { assets, defines, includes, rootXiIncludes, nestedXiIncludes };
+}
+
+/** Converts a shallow scan (offsets) into index records (1-based lines). */
+export function recordsFromShallow(scan: ShallowDocument, lineMap: LineMap): IndexRecords {
+  return {
+    assets: scan.assets.map((a) => ({
+      type: a.name,
+      id: a.id,
+      line: lineOf(lineMap, a.idValueStart),
+    })),
+    defines: scan.defines.map((d) => ({
+      name: d.name,
+      value: d.value,
+      line: lineOf(lineMap, d.start),
+    })),
+    includes: scan.includes.map((i) => ({
+      type: i.type,
+      source: i.source,
+      line: lineOf(lineMap, i.start),
+    })),
+    rootXiIncludes: scan.rootXiIncludes.map((x) => ({
+      href: x.href,
+      xpointer: x.xpointer,
+      line: lineOf(lineMap, x.start),
+    })),
+    nestedXiIncludes: scan.nestedXiIncludes.map((x) => ({
+      href: x.href,
+      xpointer: x.xpointer,
+      line: lineOf(lineMap, x.start),
+    })),
+  };
+}
@@ -0,0 +1,274 @@
+/**
+ * Shallow XML scanner for large art-asset documents (e.g. .w3x).
+ *
+ * Full XML parsing builds an element tree whose memory footprint is roughly
+ * 17x the source text (measured on Corona model files). Model exports like
+ * <W3DMesh> contain hundreds of thousands of tiny numeric elements
+ * (Vertices/V, Triangles/T, ...) that the extension never needs: the index
+ * only consumes top-level asset definitions (name + id), top-level
+ * <Includes>, nested <xi:include> targets and <Defines> constants.
+ *
+ * This scanner performs a single linear pass without building child nodes,
+ * so multi-megabyte model files can be indexed in linear time with ~zero
+ * retained memory.
+ *
+ * Pure TypeScript: no vscode dependency, reusable outside the extension.
+ */
+
+export interface ShallowAssetRecord {
+  /** Top-level element name, e.g. "W3DContainer". */
+  name: string;
+  /** Value of the id attribute. */
+  id: string;
+  /** Offset of the first id value character. */
+  idValueStart: number;
+  /** Offset one past the last id value character. */
+  idValueEnd: number;
+  /** Offset of the element's "<". */
+  start: number;
+  /** Offset one past the ">" of the start tag. */
+  startTagEnd: number;
+}
+
+export interface ShallowIncludeRecord {
+  /** "all" | "instance" | "reference", or null when absent/unknown. */
+  type: "all" | "instance" | "reference" | null;
+  source: string;
+  /** Offset of the <Include> element. */
+  start: number;
+}
+
+export interface ShallowXiIncludeRecord {
+  href: string;
+  xpointer: string | null;
+  /** Offset of the <xi:include> element. */
+  start: number;
+}
+
+export interface ShallowDefineRecord {
+  name: string;
+  value: string;
+  /** Offset of the <Define> element. */
+  start: number;
+}
+
+export interface ShallowScanError {
+  message: string;
+  offset: number;
+}
+
+export interface ShallowDocument {
+  assets: ShallowAssetRecord[];
+  includes: ShallowIncludeRecord[];
+  /** <xi:include> elements that are direct children of the root. */
+  rootXiIncludes: ShallowXiIncludeRecord[];
+  /** <xi:include> elements nested anywhere else in the document. */
+  nestedXiIncludes: ShallowXiIncludeRecord[];
+  defines: ShallowDefineRecord[];
+  errors: ShallowScanError[];
+}
+
+interface AttrHit {
+  value: string;
+  valueStart: number;
+  valueEnd: number;
+}
+
+/**
+ * Matches a complete XML tag while respecting quoted attribute values, so a
+ * ">" or "/" inside a value never terminates the tag early.
+ */
+const TAG_RE = /<(?:"[^"]*"|'[^']*'|[^'"<>])*>/g;
+
+export function scanXmlShallow(text: string): ShallowDocument {
+  const errors: ShallowScanError[] = [];
+  const assets: ShallowAssetRecord[] = [];
+  const includes: ShallowIncludeRecord[] = [];
+  const rootXiIncludes: ShallowXiIncludeRecord[] = [];
+  const nestedXiIncludes: ShallowXiIncludeRecord[] = [];
+  const defines: ShallowDefineRecord[] = [];
+
+  // Depth of the currently open element stack. The document root opens at
+  // depth 0 -> 1, so its direct children open when depth === 1.
+  let depth = 0;
+  let inIncludes = false;
+  let inDefines = false;
+  let i = 0;
+
+  while (i < text.length) {
+    const lt = text.indexOf("<", i);
+    if (lt < 0) break;
+
+    // Non-element constructs: comments, CDATA, DOCTYPE and processing
+    // instructions are skipped whole so their content never looks like tags.
+    if (text.startsWith("<!--", lt)) {
+      const close = text.indexOf("-->", lt + 4);
+      if (close < 0) {
+        errors.push({ message: "Unterminated comment", offset: lt });
+        break;
+      }
+      i = close + 3;
+      continue;
+    }
+    if (text.startsWith("<![CDATA[", lt)) {
+      const close = text.indexOf("]]>", lt + 9);
+      if (close < 0) {
+        errors.push({ message: "Unterminated CDATA section", offset: lt });
+        break;
+      }
+      i = close + 3;
+      continue;
+    }
+    if (text.startsWith("<!", lt)) {
+      const close = text.indexOf(">", lt + 2);
+      if (close < 0) {
+        errors.push({ message: "Unterminated DOCTYPE", offset: lt });
+        break;
+      }
+      i = close + 1;
+      continue;
+    }
+    if (text.startsWith("<?", lt)) {
+      const close = text.indexOf("?>", lt + 2);
+      if (close < 0) {
+        errors.push({ message: "Unterminated processing instruction", offset: lt });
+        break;
+      }
+      i = close + 2;
+      continue;
+    }
+
+    TAG_RE.lastIndex = lt;
+    const m = TAG_RE.exec(text);
+    if (!m) {
+      errors.push({ message: "Unterminated tag", offset: lt });
+      break;
+    }
+    const tag = m[0];
+    const gt = m.index + tag.length - 1;
+    const inner = tag.slice(1, -1);
+    const closing = inner.startsWith("/");
+    const selfClosing = !closing && /\/\s*$/.test(inner);
+    const body = closing ? inner.slice(1) : inner;
+    let nameEnd = 0;
+    while (nameEnd < body.length && !/[\s/>]/.test(body[nameEnd])) nameEnd++;
+    const name = body.slice(0, nameEnd);
+    const base = lt + 1;
+
+    if (!closing) {
+      // Top-level elements (direct children of the root).
+      if (depth === 1) {
+        inIncludes = name === "Includes";
+        inDefines = name === "Defines";
+        const idAttr = findAttr(inner, base, "id");
+        if (idAttr && idAttr.value) {
+          assets.push({
+            name,
+            id: idAttr.value,
+            idValueStart: idAttr.valueStart,
+            idValueEnd: idAttr.valueEnd,
+            start: lt,
+            startTagEnd: gt + 1,
+          });
+        }
+      }
+      // <Include> entries inside the top-level <Includes> block.
+      if (inIncludes && depth === 2 && name === "Include") {
+        const type = findAttr(inner, base, "type");
+        const source = findAttr(inner, base, "source");
+        if (source?.value) {
+          includes.push({
+            type:
+              type?.value === "all" || type?.value === "instance" || type?.value === "reference"
+                ? type.value
+                : null,
+            source: source.value,
+            start: lt,
+          });
+        }
+      }
+      // <Define> entries inside the top-level <Defines> block.
+      if (inDefines && depth === 2 && name === "Define") {
+        const nameAttr = findAttr(inner, base, "name");
+        const valueAttr = findAttr(inner, base, "value");
+        if (nameAttr?.value) {
+          defines.push({ name: nameAttr.value, value: valueAttr?.value ?? "", start: lt });
+        }
+      }
+      // Nested <xi:include> (or any *:include) anywhere in the document.
+      if (localName(name) === "include") {
+        const href = findAttr(inner, base, "href");
+        const xpointer = findAttr(inner, base, "xpointer");
+        if (href?.value) {
+          const rec: ShallowXiIncludeRecord = {
+            href: href.value,
+            xpointer: xpointer?.value ?? null,
+            start: lt,
+          };
+          if (depth === 1) rootXiIncludes.push(rec);
+          else nestedXiIncludes.push(rec);
+        }
+      }
+      if (!selfClosing) depth++;
+    } else {
+      depth--;
+    }
+    i = gt + 1;
+  }
+
+  return { assets, includes, rootXiIncludes, nestedXiIncludes, defines, errors };
+}
+
+/**
+ * Scans the attributes of a tag (its inner text, without "<" and ">") for
+ * the first occurrence of `want` and returns its value with absolute offsets
+ * (base = offset one past the "<").
+ */
+function findAttr(inner: string, base: number, want: string): AttrHit | null {
+  let i = 0;
+  while (i < inner.length) {
+    while (i < inner.length && /\s/.test(inner[i])) i++;
+    // Self-closing marker or end of tag: no more attributes.
+    if (i >= inner.length || inner[i] === "/" || inner[i] === ">") break;
+    const nameStart = i;
+    while (i < inner.length && !/[\s=/>]/.test(inner[i])) i++;
+    const name = inner.slice(nameStart, i);
+    while (i < inner.length && /\s/.test(inner[i])) i++;
+    if (inner[i] === "=") {
+      i++;
+      while (i < inner.length && /\s/.test(inner[i])) i++;
+      const q = inner[i];
+      if (q === '"' || q === "'") {
+        const vStart = i + 1;
+        const vEnd = inner.indexOf(q, vStart);
+        if (vEnd < 0) {
+          return name === want ? { value: "", valueStart: -1, valueEnd: -1 } : null;
+        }
+        if (name === want) {
+          return {
+            value: inner.slice(vStart, vEnd),
+            valueStart: base + vStart,
+            valueEnd: base + vEnd,
+          };
+        }
+        i = vEnd + 1;
+        continue;
+      }
+      // Unquoted value (tolerated).
+      const vs = i;
+      while (i < inner.length && !/[\s>]/.test(inner[i])) i++;
+      if (name === want) {
+        return { value: inner.slice(vs, i), valueStart: base + vs, valueEnd: base + i };
+      }
+      continue;
+    }
+    // Attribute without a value (rare but tolerated).
+    if (name === want) return { value: "", valueStart: -1, valueEnd: -1 };
+  }
+  return null;
+}
+
+function localName(name: string): string {
+  const idx = name.lastIndexOf(":");
+  return idx >= 0 ? name.slice(idx + 1) : name;
+}
@@ -1,6 +1,8 @@
 import type { XmlDocument } from "../language/xmlParser";
 import type { ManifestInfo } from "./manifestParser";
 import type { LineMap } from "../language/xmlParser";
+import type { IndexRecords } from "./records";
+import type { DocumentCache, IncludeResolveCache, IndexRecordsCache } from "./caches";

 export type AssetOrigin = "project" | "sdk" | "manifest";

@@ -65,6 +67,20 @@ export interface IndexStats {
  sdkDir: string;
  indexedFiles: number;
  parsedFiles: number;
+  /** Art-asset documents indexed via shallow scan (no DOM tree). */
+  shallowScannedFiles: number;
+  /** Shallow scans served from the persistent cache (unchanged files). */
+  shallowCacheHits: number;
+  /** Parsed XML files served from the persistent records cache. */
+  recordsCacheHits: number;
+  /** Include/xi:include resolutions served from the resolve cache. */
+  resolveCacheHits: number;
+  /** Include/xi:include resolutions performed during this build. */
+  resolveCalls: number;
+  /** Time spent enumerating Include source candidates (ms). */
+  candidatesMs: number;
+  /** Time spent walking the include graph (ms). */
+  walkMs: number;
  assetCount: number;
  defineCount: number;
  manifestFiles: number;
@@ -102,6 +118,23 @@ export interface IndexOptions {
  additionalDataSearchPaths: string[];
  /** Directory walker used to enumerate files for source completion. */
  walker: FileWalker;
+  /** Optional parse-tree cache shared across rebuilds (owned by the workspace). */
+  documentCache?: DocumentCache;
+  /** Optional index-records cache shared across rebuilds (owned by the workspace). */
+  recordsCache?: IndexRecordsCache;
+  /** Optional include-resolution cache shared across rebuilds (owned by the workspace). */
+  resolveCache?: IncludeResolveCache;
+  /**
+   * When true, cached documents whose path is not in `changedFiles` are used
+   * without a per-file stat. The workspace enables this while a file watcher
+   * invalidates caches for changed paths; a forced reindex passes false.
+   */
+  trustUnchanged?: boolean;
+  /**
+   * Normalized paths (see `normKey`) known to have changed since the caches
+   * were populated. Only consulted when `trustUnchanged` is true.
+   */
+  changedFiles?: ReadonlySet<string>;
 }

 export interface FileWalker {
@@ -121,5 +154,10 @@ export interface ParseCache {
 export interface ParsedFile {
  file: IndexedFile;
  parse: XmlDocument | null;
+  /**
+   * Compact index records (assets/defines/includes/xi:include with lines).
+   * Present for every indexable XML document; null for binary files.
+   */
+  records: IndexRecords | null;
  lineMap: LineMap | null;
 }
@@ -66,6 +66,14 @@ export interface Position {
  character: number;
 }

+/**
+ * Removes a leading UTF-8 byte-order mark (U+FEFF) so source offsets match
+ * the text as editors expose it (VS Code strips the BOM from document text).
+ */
+export function stripBom(text: string): string {
+  return text.charCodeAt(0) === 0xfeff ? text.slice(1) : text;
+}
+
 /** Precomputes line start offsets for offset <-> position conversion. */
 export class LineMap {
  private lineStarts: number[] = [0];
@@ -3,6 +3,7 @@ import { existsSync } from "node:fs";
 import { join, dirname } from "node:path";
 import { CachedDirectoryWalker } from "./indexer/fileScanner";
 import { ModIndexer } from "./indexer/indexer";
+import { DocumentCache, IncludeResolveCache, IndexRecordsCache } from "./indexer/caches";
 import type { ModIndex } from "./indexer/types";
 import { readSettings, type ExtensionSettings } from "./settings";

@@ -15,12 +16,21 @@ export class ModWorkspace {
  settings: ExtensionSettings;

  private walker = new CachedDirectoryWalker();
+  // Caches owned here survive rebuilds: a fresh ModIndexer reuses them and
+  // only re-reads files whose stat changed (crucial for the ~2.6 GB of .w3x
+  // art assets in a project like Corona).
+  private documentCache = new DocumentCache();
+  private recordsCache = new IndexRecordsCache();
+  private resolveCache = new IncludeResolveCache();
+  private context: vscode.ExtensionContext;
+  private watchers: vscode.FileSystemWatcher[] = [];
  private statusBar: vscode.StatusBarItem;
  private rebuildTimer: ReturnType<typeof setTimeout> | null = null;
  private building = false;
  private dirty = false;

  constructor(context: vscode.ExtensionContext) {
+    this.context = context;
    this.settings = readSettings();
    this.statusBar = vscode.window.createStatusBarItem(
      vscode.StatusBarAlignment.Left,
@@ -51,11 +61,69 @@ export class ModWorkspace {
      this.statusBar.hide();
      return;
    }
+    this.startWatching();
    this.statusBar.text = "$(sync~spin) RA3 XML: indexing…";
    this.statusBar.show();
    await this.rebuild();
  }

+  /**
+   * Invalidates cached documents for a path (called by the file watcher and
+   * on document save), so the next rebuild re-reads it instead of trusting
+   * the cached copy.
+   */
+  invalidate(path: string): void {
+    if (!path) return;
+    this.documentCache.invalidate(path);
+    this.recordsCache.invalidate(path);
+  }
+
+  /**
+   * Called when files are created or deleted: include-resolution results
+   * (which encode file existence) are no longer trustworthy.
+   */
+  invalidateExistence(): void {
+    this.resolveCache.clear();
+  }
+
+  /**
+   * Watches the project, SDK and extra DATA roots for file changes and
+   * invalidates the corresponding cache entries. With caches invalidated
+   * precisely, rebuilds can trust every other cached file and skip per-file
+   * stats (huge win on mechanical drives; Corona rebuild dropped from ~38s
+   * to a few seconds).
+   */
+  private startWatching(): void {
+    if (!this.projectRoot) return;
+    const roots = new Set([
+      this.projectRoot,
+      this.settings.sdkPath,
+      ...this.settings.additionalDataSearchPaths,
+    ]);
+    for (const root of roots) {
+      if (!existsSync(root)) continue;
+      try {
+        const watcher = vscode.workspace.createFileSystemWatcher(
+          new vscode.RelativePattern(root, "**/*"),
+        );
+        watcher.onDidCreate((uri) => {
+          this.invalidate(uri.fsPath);
+          this.invalidateExistence();
+        });
+        watcher.onDidChange((uri) => this.invalidate(uri.fsPath));
+        watcher.onDidDelete((uri) => {
+          this.invalidate(uri.fsPath);
+          this.invalidateExistence();
+        });
+        this.watchers.push(watcher);
+        this.context.subscriptions.push(watcher);
+      } catch {
+        // The root may be temporarily unavailable (e.g. removable drive);
+        // indexing still works, just without watcher-based invalidation.
+      }
+    }
+  }
+
  scheduleRebuild(): void {
    if (!this.projectRoot) return;
    if (this.rebuildTimer) clearTimeout(this.rebuildTimer);
@@ -64,12 +132,13 @@ export class ModWorkspace {
    }, REBUILD_DEBOUNCE_MS);
  }

-  async rebuild(): Promise<void> {
+  async rebuild(force = false): Promise<void> {
    if (!this.projectRoot) return;
    if (this.building) {
      this.dirty = true;
      return;
    }
+    if (force) this.resolveCache.clear();
    this.building = true;
    this.settings = readSettings();
    try {
@@ -81,6 +150,12 @@ export class ModWorkspace {
        indexSageXml: this.settings.indexSageXml,
        additionalDataSearchPaths: this.settings.additionalDataSearchPaths,
        walker: this.walker,
+        documentCache: this.documentCache,
+        recordsCache: this.recordsCache,
+        resolveCache: this.resolveCache,
+        // Trust cache entries unless the user explicitly asked for a full
+        // verification (ra3modxml.reindex).
+        trustUnchanged: !force,
      });
      const started = Date.now();
      this.index = await indexer.build();
@@ -90,7 +165,7 @@ export class ModWorkspace {
      this.statusBar.text = `$(symbol-misc) RA3 XML: ${formatCount(s.assetCount)} assets`;
      this.statusBar.tooltip =
        `${s.projectDir}\n` +
-        `${s.indexedFiles} files indexed (${secs}s)\n` +
+        `${s.indexedFiles} files indexed (${s.parsedFiles} parsed, ${s.shallowScannedFiles} art assets shallow-scanned, ${secs}s)\n` +
        `${s.assetCount} assets (${s.manifestAssetCount} from ${s.manifestFiles} manifests)\n` +
        `${s.defineCount} defines, ${s.streams} streams, ${s.sourceCandidates} include candidates`;
    } catch (err) {
@@ -113,6 +188,7 @@ export class ModWorkspace {
    return {
      file: { path, stat: null },
      parse,
+      records: null,
      lineMap: new LineMap(text),
    };
  }
@@ -0,0 +1,73 @@
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import {
+  DocumentCache,
+  IncludeResolveCache,
+  IndexRecordsCache,
+} from "../out/indexer/caches.js";
+
+function parsed(path, elements) {
+  return {
+    file: { path, stat: { mtimeMs: 1, size: 1 } },
+    parse: { root: { name: "r" }, elements: new Array(elements), errors: [] },
+    records: null,
+    lineMap: null,
+  };
+}
+
+test("DocumentCache evicts the largest tree when over the element budget", () => {
+  const cache = new DocumentCache(64, 100);
+  cache.set(parsed("a.xml", 60));
+  cache.set(parsed("b.xml", 60));
+  assert.equal(cache.get("a.xml"), undefined, "largest tree evicted first");
+  assert.ok(cache.get("b.xml"));
+});
+
+test("DocumentCache evicts least recently used when over capacity", () => {
+  const cache = new DocumentCache(2, 1_000_000);
+  cache.set(parsed("a.xml", 10));
+  cache.set(parsed("b.xml", 10));
+  cache.set(parsed("c.xml", 10));
+  assert.equal(cache.get("a.xml"), undefined);
+  assert.ok(cache.get("b.xml"));
+  assert.ok(cache.get("c.xml"));
+});
+
+test("DocumentCache invalidate frees budget", () => {
+  const cache = new DocumentCache(64, 100);
+  cache.set(parsed("a.xml", 60));
+  cache.invalidate("a.xml");
+  cache.set(parsed("b.xml", 60));
+  assert.ok(cache.get("b.xml"), "invalidating a freed its budget share");
+  cache.set(parsed("c.xml", 60));
+  assert.equal(cache.get("a.xml"), undefined);
+  assert.ok(cache.get("c.xml"));
+});
+
+test("IndexRecordsCache stores and invalidates entries", () => {
+  const cache = new IndexRecordsCache();
+  const entry = {
+    stat: { mtimeMs: 1, size: 1 },
+    records: { assets: [], defines: [], includes: [], rootXiIncludes: [], nestedXiIncludes: [] },
+    kind: "full",
+  };
+  cache.set("a.xml", entry);
+  assert.equal(cache.get("a.xml"), entry);
+  cache.invalidate("a.xml");
+  assert.equal(cache.get("a.xml"), undefined);
+});
+
+test("IncludeResolveCache stores sources and manifest lookups", () => {
+  const cache = new IncludeResolveCache();
+  const key = "dir|DATA:static.xml";
+  const result = { path: "C:/sdk/static.xml", prefix: "DATA", raw: "DATA:static.xml" };
+  assert.equal(cache.get(key), undefined);
+  cache.set(key, result);
+  assert.equal(cache.get(key), result);
+  assert.equal(cache.getManifest("static.xml"), undefined);
+  cache.setManifest("static.xml", "C:/sdk/builtmods/static.manifest");
+  assert.equal(cache.getManifest("static.xml"), "C:/sdk/builtmods/static.manifest");
+  cache.clear();
+  assert.equal(cache.get(key), undefined);
+  assert.equal(cache.getManifest("static.xml"), undefined);
+});
@@ -0,0 +1,2 @@
+This is a fake DDS payload used to verify that binary assets included from
+an XML hub are registered as files but never parsed as XML.
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<AssetDeclaration xmlns="uri:ea.com:eala:asset">
+	<W3DMesh id="Tank_FP" />
+</AssetDeclaration>
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<AssetDeclaration xmlns="uri:ea.com:eala:asset">
+	<W3DContainer id="Tank_SKN" Hierarchy="Tank_SKL" />
+	<W3DHierarchy id="Tank_SKL" />
+</AssetDeclaration>
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AssetDeclaration xmlns="uri:ea.com:eala:asset">
+	<Includes>
+		<Include type="all" source="Models/Tank_SKN.w3x" />
+		<Include type="all" source="Models/Tank_FP.w3d" />
+		<Include type="all" source="Models/Tank_Damaged.dds" />
+	</Includes>
+</AssetDeclaration>
@@ -9,5 +9,6 @@
 		<Include type="all" source="Includes/Weapons.xml" />
 		<Include type="all" source="Includes/Shared.xml" />
 		<Include type="all" source="Includes/Refs.xml" />
+		<Include type="all" source="Includes/VehicleArt.xml" />
 	</Includes>
 </AssetDeclaration>
@@ -2,8 +2,16 @@ import { test } from "node:test";
 import assert from "node:assert/strict";
 import { fileURLToPath } from "node:url";
 import { dirname, join } from "node:path";
+import fs from "node:fs";
+import os from "node:os";
 import { ModIndexer } from "../out/indexer/indexer.js";
 import { CachedDirectoryWalker } from "../out/indexer/fileScanner.js";
+import {
+  DocumentCache,
+  IncludeResolveCache,
+  IndexRecordsCache,
+} from "../out/indexer/caches.js";
+import { resolveReferenceTargetsForType } from "../out/indexer/refs.js";

 const root = dirname(dirname(fileURLToPath(import.meta.url)));
 const project = join(root, "test", "fixtures", "minimod");
@@ -70,3 +78,182 @@ test("provides include source candidates", async () => {
  assert.ok(xml.some((c) => c.source === "Includes/Units.xml"));
  assert.ok(xml.some((c) => c.source === "DATA:static.xml"));
 });
+
+test("indexes art-asset XML (.w3x / sniffed .w3d) via shallow scan and skips binary", async () => {
+  const idx = await buildIndex();
+
+  // The .w3x hub chain: Mod.xml -> VehicleArt.xml -> Models/Tank_SKN.w3x.
+  const skn = idx.assetsById.get("tank_skn");
+  assert.ok(skn?.some((d) => d.type === "W3DContainer"), "W3DContainer from .w3x indexed");
+  assert.ok(
+    idx.assetsById.get("tank_skl")?.some((d) => d.type === "W3DHierarchy"),
+    "W3DHierarchy from .w3x indexed",
+  );
+  const container = skn.find((d) => d.type === "W3DContainer");
+  assert.match(container.file, /Tank_SKN\.w3x$/);
+  assert.ok(container.line > 0, "definition line recorded from shallow scan");
+
+  // Unknown extension with XML content is sniffed and indexed.
+  assert.ok(
+    idx.assetsById.get("tank_fp")?.some((d) => d.type === "W3DMesh"),
+    "unknown-extension XML (.w3d) sniffed and indexed",
+  );
+
+  // Binary content is registered as a file but never parsed.
+  assert.equal(idx.assetsById.get("tank_damaged"), undefined, "binary asset never indexed");
+  assert.ok(
+    idx.files.has(
+      join(project, "Data", "Includes", "Models", "Tank_Damaged.dds").toLowerCase(),
+    ),
+    "binary include target registered as a file",
+  );
+
+  // The reported Harbinger scenario: <Model Name="Tank_SKN"/> (refType
+  // BaseRenderAssetType) must resolve to the W3DContainer defined in the w3x.
+  const targets = resolveReferenceTargetsForType(
+    idx,
+    "ScriptedModelDrawModel",
+    "Name",
+    "Tank_SKN",
+  );
+  assert.equal(targets.length, 1);
+  assert.equal(targets[0].def.type, "W3DContainer");
+  assert.match(targets[0].def.file, /Tank_SKN\.w3x$/);
+});
+
+test("w3x files appear in Include source completion candidates", async () => {
+  const idx = await buildIndex();
+  assert.ok(
+    idx.sourceCandidates.some((c) => c.source === "Includes/Models/Tank_SKN.w3x"),
+    "project-relative w3x candidate",
+  );
+  assert.ok(
+    idx.sourceCandidates.some((c) => c.source === "DATA:Includes/Models/Tank_SKN.w3x"),
+    "DATA: w3x candidate",
+  );
+});
+
+test("shallow scans and full parses are cached across rebuilds", async () => {
+  const documentCache = new DocumentCache();
+  const recordsCache = new IndexRecordsCache();
+  const resolveCache = new IncludeResolveCache();
+  const makeIndexer = () =>
+    new ModIndexer({
+      projectDir: project,
+      sdkDir: sdk,
+      builtmodsDirs: [join(sdk, "builtmods")],
+      indexSageXml: true,
+      additionalDataSearchPaths: [],
+      walker: new CachedDirectoryWalker(),
+      documentCache,
+      recordsCache,
+      resolveCache,
+    });
+
+  const first = await makeIndexer().build();
+  const second = await makeIndexer().build();
+
+  assert.equal(first.stats.shallowScannedFiles, 2, "w3x + sniffed w3d scanned on first build");
+  assert.equal(second.stats.shallowScannedFiles, 0, "unchanged art assets are not re-scanned");
+  assert.equal(second.stats.shallowCacheHits, 2);
+  assert.ok(second.stats.recordsCacheHits > 0, "XML records served from cache");
+  assert.ok(second.stats.resolveCacheHits > 0, "include resolutions served from cache");
+  assert.equal(second.stats.resolveCalls, 0, "no include re-resolved on a trusted rebuild");
+  assert.equal(second.stats.assetCount, first.stats.assetCount);
+  assert.equal(second.stats.indexedFiles, first.stats.indexedFiles);
+});
+
+test("trusted rebuilds skip unchanged files; invalidation forces re-reads", async () => {
+  const documentCache = new DocumentCache();
+  const recordsCache = new IndexRecordsCache();
+  const resolveCache = new IncludeResolveCache();
+  const opts = () => ({
+    projectDir: project,
+    sdkDir: sdk,
+    builtmodsDirs: [join(sdk, "builtmods")],
+    indexSageXml: true,
+    additionalDataSearchPaths: [],
+    walker: new CachedDirectoryWalker(),
+    documentCache,
+    recordsCache,
+    resolveCache,
+  });
+
+  // Trusted rebuild: cached files are reused without any per-file stat/read.
+  const first = await new ModIndexer({ ...opts(), trustUnchanged: true }).build();
+  assert.equal(first.stats.shallowScannedFiles, 2);
+  const second = await new ModIndexer({ ...opts(), trustUnchanged: true }).build();
+  assert.equal(second.stats.shallowScannedFiles, 0);
+  assert.equal(second.stats.shallowCacheHits, 2);
+  assert.ok(second.stats.recordsCacheHits > 0);
+
+  // Simulate the file watcher / save handler: invalidate one art asset.
+  // The next trusted rebuild must re-scan exactly that file.
+  recordsCache.invalidate(join(project, "Data", "Includes", "Models", "Tank_SKN.w3x"));
+  const third = await new ModIndexer({ ...opts(), trustUnchanged: true }).build();
+  assert.equal(third.stats.shallowScannedFiles, 1);
+  assert.equal(third.stats.shallowCacheHits, 1);
+  assert.ok(
+    third.assetsById.get("tank_skn")?.some((d) => d.type === "W3DContainer"),
+    "re-scanned w3x asset present",
+  );
+
+  // Invalidate one XML file: exactly its records are re-extracted.
+  recordsCache.invalidate(join(project, "Data", "Includes", "Units.xml"));
+  const fourth = await new ModIndexer({ ...opts(), trustUnchanged: true }).build();
+  assert.equal(fourth.stats.recordsCacheHits, third.stats.recordsCacheHits - 1);
+  assert.ok(
+    fourth.assetsById.get("testtank")?.some((d) => d.type === "GameObject"),
+    "re-parsed XML asset present",
+  );
+
+  // A forced rebuild (ra3modxml.reindex) verifies stats but still reuses
+  // content caches for unchanged files.
+  const forced = await new ModIndexer({ ...opts(), trustUnchanged: false }).build();
+  assert.equal(forced.stats.shallowScannedFiles, 0);
+  assert.equal(forced.stats.shallowCacheHits, 2);
+});
+
+test("index stats include candidate/walk phase timings", async () => {
+  const idx = await buildIndex();
+  assert.equal(typeof idx.stats.candidatesMs, "number");
+  assert.equal(typeof idx.stats.walkMs, "number");
+});
+
+test("w3x with a UTF-8 BOM is indexed with correct offsets", async (t) => {
+  const tmp = fs.mkdtempSync(join(os.tmpdir(), "ra3modxml-bom-"));
+  t.after(() => fs.rmSync(tmp, { recursive: true, force: true }));
+  const projectDir = join(tmp, "project");
+  fs.mkdirSync(join(projectDir, "Data", "Models"), { recursive: true });
+  fs.writeFileSync(
+    join(projectDir, "Data", "Mod.xml"),
+    `<?xml version="1.0" encoding="utf-8"?>
+<AssetDeclaration>
+  <Includes>
+    <Include type="all" source="Models/Tank_BOM.w3x"/>
+  </Includes>
+</AssetDeclaration>`,
+    "utf8",
+  );
+  fs.writeFileSync(
+    join(projectDir, "Data", "Models", "Tank_BOM.w3x"),
+    "\uFEFF<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
+      "<AssetDeclaration>\n" +
+      "  <W3DContainer id=\"Tank_BOM\" />\n" +
+      "</AssetDeclaration>\n",
+    "utf8",
+  );
+
+  const idx = await new ModIndexer({
+    projectDir,
+    sdkDir: sdk,
+    builtmodsDirs: [join(sdk, "builtmods")],
+    indexSageXml: false,
+    additionalDataSearchPaths: [],
+    walker: new CachedDirectoryWalker(),
+  }).build();
+
+  const def = idx.assetsById.get("tank_bom")?.find((d) => d.type === "W3DContainer");
+  assert.ok(def, "BOM-prefixed w3x asset indexed");
+  assert.equal(def.line, 3, "id line is correct despite the BOM");
+});
@@ -0,0 +1,65 @@
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import { parseXml, LineMap } from "../out/language/xmlParser.js";
+import { extractIndexRecords, recordsFromShallow } from "../out/indexer/records.js";
+import { scanXmlShallow } from "../out/indexer/shallowScan.js";
+
+test("extractIndexRecords mirrors the walk semantics", () => {
+  const text = `<?xml version="1.0"?>
+<AssetDeclaration>
+  <Defines>
+    <Define name="HP" value="100"/>
+  </Defines>
+  <Includes>
+    <Include type="all" source="Units.xml"/>
+    <Include type="instance" source="Base.xml"/>
+  </Includes>
+  <GameObject id="Tank" CommandSet="TankCommandSet"/>
+  <WeaponTemplate id="TankGun"/>
+  <xi:include href="DATA:Extra.xml" xpointer="xmlns(n=uri:ea.com:eala:asset) xpointer(/n:Extra/child::*)"/>
+  <GameObject id="Tank2">
+    <Draws>
+      <xi:include href="DATA:Nested.xml"/>
+    </Draws>
+  </GameObject>
+</AssetDeclaration>`;
+  const lineMap = new LineMap(text);
+  const records = extractIndexRecords(parseXml(text), lineMap);
+  assert.deepEqual(
+    records.assets.map((a) => [a.type, a.id, a.line]),
+    [
+      ["GameObject", "Tank", 10],
+      ["WeaponTemplate", "TankGun", 11],
+      ["GameObject", "Tank2", 13],
+    ],
+  );
+  assert.deepEqual(
+    records.defines.map((d) => [d.name, d.value]),
+    [["HP", "100"]],
+  );
+  assert.deepEqual(
+    records.includes.map((i) => [i.type, i.source]),
+    [
+      ["all", "Units.xml"],
+      ["instance", "Base.xml"],
+    ],
+  );
+  assert.deepEqual(
+    records.rootXiIncludes.map((x) => [x.href, x.line]),
+    [["DATA:Extra.xml", 12]],
+  );
+  assert.deepEqual(
+    records.nestedXiIncludes.map((x) => [x.href, x.line]),
+    [["DATA:Nested.xml", 15]],
+  );
+});
+
+test("recordsFromShallow converts offsets to 1-based lines", () => {
+  const text = `<AssetDeclaration>\n  <W3DContainer id="A"/>\n</AssetDeclaration>`;
+  const lineMap = new LineMap(text);
+  const records = recordsFromShallow(scanXmlShallow(text), lineMap);
+  assert.equal(records.assets.length, 1);
+  assert.equal(records.assets[0].type, "W3DContainer");
+  assert.equal(records.assets[0].id, "A");
+  assert.equal(records.assets[0].line, 2);
+});
@@ -0,0 +1,122 @@
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import { scanXmlShallow } from "../out/indexer/shallowScan.js";
+
+test("extracts top-level assets, includes, defines and xi:include", () => {
+  const text = `<?xml version="1.0"?>
+<AssetDeclaration xmlns="uri:ea.com:eala:asset">
+  <Defines>
+    <Define name="MODEL_SCALE" value="1.0"/>
+  </Defines>
+  <Includes>
+    <Include type="all" source="Art/Model_SKN.w3x"/>
+    <Include type="reference" source="DATA:static.xml"/>
+  </Includes>
+  <W3DContainer id="Model_SKN" Hierarchy="Model_SKL">
+    <SubObject SubObjectID="GUN">
+      <RenderObject><Mesh>Model_SKN.GUN</Mesh></RenderObject>
+    </SubObject>
+  </W3DContainer>
+  <W3DMesh id="Model_SKN.GUN"/>
+  <xi:include href="DATA:Includes/Extra.xml" xpointer="xmlns(n=uri:ea.com:eala:asset) xpointer(/n:Extra/child::*)"/>
+</AssetDeclaration>`;
+  const doc = scanXmlShallow(text);
+  assert.equal(doc.errors.length, 0);
+  assert.deepEqual(
+    doc.assets.map((a) => `${a.name}:${a.id}`),
+    ["W3DContainer:Model_SKN", "W3DMesh:Model_SKN.GUN"],
+  );
+  assert.equal(doc.includes.length, 2);
+  assert.equal(doc.includes[0].type, "all");
+  assert.equal(doc.includes[0].source, "Art/Model_SKN.w3x");
+  assert.equal(doc.includes[1].type, "reference");
+  assert.equal(doc.defines.length, 1);
+  assert.equal(doc.defines[0].name, "MODEL_SCALE");
+  assert.equal(doc.defines[0].value, "1.0");
+  assert.equal(doc.rootXiIncludes.length, 1);
+  assert.equal(doc.rootXiIncludes[0].href, "DATA:Includes/Extra.xml");
+  assert.match(doc.rootXiIncludes[0].xpointer, /xpointer\(/);
+  assert.equal(doc.nestedXiIncludes.length, 0);
+
+  // Recorded offsets must slice the original text back out.
+  const container = doc.assets[0];
+  assert.equal(text.slice(container.idValueStart, container.idValueEnd), "Model_SKN");
+  assert.equal(text.slice(container.start, container.startTagEnd).startsWith("<W3DContainer"), true);
+  const mesh = doc.assets[1];
+  assert.equal(text.slice(mesh.idValueStart, mesh.idValueEnd), "Model_SKN.GUN");
+});
+
+test("handles > and / inside quoted values, self-closing tags and comments", () => {
+  const text = `<?xml version="1.0"?>
+<!-- a > comment with < inside -->
+<AssetDeclaration xmlns="uri:ea.com:eala:asset">
+  <W3DContainer id="Weird" Description="a > b < c" />
+  <W3DMesh id="X" VertexData="a / b"/>
+</AssetDeclaration>`;
+  const doc = scanXmlShallow(text);
+  assert.equal(doc.errors.length, 0);
+  assert.deepEqual(
+    doc.assets.map((a) => a.id),
+    ["Weird", "X"],
+  );
+});
+
+test("skips CDATA and processing instructions", () => {
+  const text = `<AssetDeclaration>
+  <!-- <W3DMesh id="FAKE"/> -->
+  <![CDATA[ <W3DMesh id="FAKE2"/> ]]>
+  <?xml-stylesheet href="x"?>
+  <W3DContainer id="REAL"/>
+</AssetDeclaration>`;
+  const doc = scanXmlShallow(text);
+  assert.equal(doc.errors.length, 0);
+  assert.deepEqual(
+    doc.assets.map((a) => a.id),
+    ["REAL"],
+  );
+});
+
+test("reports unterminated tags and keeps partial results", () => {
+  const doc = scanXmlShallow('<AssetDeclaration><W3DMesh id="A"/><W3DMesh id="B"');
+  assert.ok(doc.errors.length >= 1);
+  assert.deepEqual(
+    doc.assets.map((a) => a.id),
+    ["A"],
+  );
+});
+
+test("nested module payload does not create asset records", () => {
+  // Only top-level elements with an id are assets; the hundreds of thousands
+  // of numeric V/T elements inside a mesh are not.
+  const doc = scanXmlShallow(`<AssetDeclaration>
+  <W3DMesh id="MESH">
+    <Vertices><V X="1" Y="2" Z="3"/><V X="4" Y="5" Z="6"/></Vertices>
+    <Triangles><T A="0" B="1" C="2"/></Triangles>
+  </W3DMesh>
+</AssetDeclaration>`);
+  assert.deepEqual(
+    doc.assets.map((a) => a.id),
+    ["MESH"],
+  );
+});
+
+test("distinguishes root-level and nested xi:include", () => {
+  const doc = scanXmlShallow(`<AssetDeclaration>
+  <xi:include href="DATA:Top.xml"/>
+  <W3DMesh id="MESH">
+    <SubObject>
+      <RenderObject>
+        <xi:include href="DATA:Nested.xml" xpointer="xmlns(n=uri:ea.com:eala:asset) xpointer(/n:X/child::*)"/>
+      </RenderObject>
+    </SubObject>
+  </W3DMesh>
+</AssetDeclaration>`);
+  assert.deepEqual(
+    doc.rootXiIncludes.map((x) => x.href),
+    ["DATA:Top.xml"],
+  );
+  assert.deepEqual(
+    doc.nestedXiIncludes.map((x) => x.href),
+    ["DATA:Nested.xml"],
+  );
+});
@@ -1,6 +1,11 @@
 import { test } from "node:test";
 import assert from "node:assert/strict";
-import { parseXml, findElementAt } from "../out/language/xmlParser.js";
+import { parseXml, findElementAt, stripBom } from "../out/language/xmlParser.js";
+
+test("stripBom removes a leading UTF-8 byte-order mark", () => {
+  assert.equal(stripBom("\uFEFF<A/>"), "<A/>");
+  assert.equal(stripBom("<A/>"), "<A/>");
+});

 test("parses elements, attributes and positions", () => {
  const text = `<AssetDeclaration xmlns="uri:ea.com:eala:asset">\n\t<GameObject id="X" KindOf="A B"/>\n</AssetDeclaration>`;
Author	SHA1	Message	Date
lanyi	44b2eaf273	0.1.1	2026-08-02 19:11:54 +02:00
lanyi	4cc07b9abc	支持 W3X	2026-08-02 14:32:18 +02:00
				`@@ -1 +0,0 @@`
				`[0801/032923.150:ERROR:third_party\crashpad\crashpad\util\win\registration_protocol_win.cc:108] CreateFile: 拒绝访问。 (0x5)`