`, favicon, and body of `Root()` to\nmatch your app's existing `index.html`, and stamp anything else your shell\nreferences directly (images, css) with `immutableFileUrl()`.\n\n1. Create `frontend/root.tsx`:\n\n```tsx\n/** @jsxImportSource npm:hono@4/jsx */\nimport { raw } from \"npm:hono@4/html\";\nimport { immutableFileUrl } from \"https://esm.town/v/std/utils/index.ts\";\n\n// The HTML shell for the app. It is never cached, so immutableFileUrl can stamp\n// the current val version into each asset URL — the browser caches those\n// immutably, and publishing the val changes the URLs, refetching exactly once.\nexport function Root() {\n return (\n <>\n {raw(\"<!DOCTYPE html>\")}\n <html lang=\"en\">\n <head>\n <meta charSet=\"UTF-8\" />\n <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\" />\n <title>React Hono Val Town Starter

[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8,"_9":10},"actionData","errors","root",{"_414":415,"_416":417},"routes/_app.x.$handle.$name",{"_11":12,"_13":14,"_15":-7,"_18":19,"_17":-7,"_311":-5,"_20":312,"_22":313,"_314":315,"_316":317,"_26":318,"_24":319,"_320":-5,"_321":-5,"_322":51,"_323":324,"_325":43,"_326":-5,"_327":-5,"_328":329},"routes/_app.x.$handle.$name.code.$",{"_11":12,"_13":14,"_15":16,"_17":-7,"_18":19,"_20":21,"_22":23,"_24":25,"_26":27,"_28":-5,"_29":-5,"_30":-5,"_31":-5,"_32":-5},"handle","justinstevens","name","caselens-canada","branchName","main","version","path","README.md","project",{"_33":253,"_13":14,"_44":254,"_255":-5,"_256":51,"_257":258,"_259":258,"_260":261,"_262":-5,"_263":264,"_265":73,"_266":43,"_267":-5,"_268":-5,"_269":65,"_270":271,"_272":273,"_274":275,"_276":277,"_278":-5,"_279":280,"_281":280,"_282":283,"_284":283,"_285":283,"_286":280,"_287":280,"_288":289,"_290":291,"_292":293,"_294":51},"tree",[54,55,56,57,58,59],"file",{"_33":34,"_13":19,"_35":36,"_37":-5,"_38":39,"_40":41,"_42":43,"_44":45,"_17":46,"_47":24,"_48":49,"_50":51,"_52":-5,"_18":53},"contents",[],"upstream","pull","ahead","behind","envVars","id","7ec3c0ac-c897-4a54-b3fe-46a0f1bed21d","fileId","01a0780a-5903-77b6-aac8-7592d4e98454","parentId","branchId","9da8d75d-5b67-4db9-bfe9-96a9f922df07","branchVersion",28,"latest",true,"createdAt",["D",1788720715968],1,"fileType","content","# CaseLens Canada\n\nA polished, Canadian-legal reader that helps users analyse a court or tribunal\ndecision. Upload a judgment (PDF, DOCX, or plain text), and CaseLens:\n\n- Parses it into numbered paragraphs and reads the case header — neutral citation, court, decision date, justice(s), style of cause, and docket number.\n- Identifies **citation-worthy passages** and highlights them **verbatim, in place**, against the categories in the legend below.\n- Explains each highlight in a right-side panel: what the judge is saying, why it matters, the legal type (ratio, test, application, finding, credibility, procedural, remedy, obiter, definition), a suggested proposition, and how to cite it.\n- Lets the user mark passages **Saved / Not useful**, add notes, and **export** the saved set (copy, `.txt`, `.md`).\n\nThe full uploaded judgment stays central — CaseLens never replaces it with a summary, and it never invents citations, parallel citations, history, or treatment. Anything it cannot confidently extract is shown as **\"Not detected\"**.\n\n[Try the app](url:index.ts)\n\n## Analytics engine\n\n- **Default (no key):** a built-in, transparent heuristic engine (regex + rules in `server/analyze.ts`) that works out of the box and is labelled in the UI.\n- **AI (recommended):** set an `ANTHROPIC_API_KEY` and the pipeline uses Claude for deep, structured extraction (`server/ai.ts`). `CLAUDE_MODEL` optionally overrides the default model.\n\n👉 Add ANTHROPIC_API_KEY here: https://www.val.town/x/justinstevens/caselens-canada/environment-variables?key=ANTHROPIC_API_KEY\n\nWhen AI is enabled, every highlight is still **anchored to a verbatim substring** of the uploaded text; candidates that can't be anchored are dropped. If the AI call fails, the app transparently falls back to the heuristic engine.\n\n### How anchoring works\n\n1. `server/text.ts` segments the document into paragraphs (preserving numbers/headings) and extracts case metadata (best-effort, honest).\n2. The engine produces highlight candidates with an `exactQuote` — AI or heuristic.\n3. `server/analyze.ts` finds each quote as a character-exact substring, records `startChar`/`endChar` offsets, and **dedupes overlapping spans** (keeping the more important one).\n\n## Architecture\n\n```mermaid\ngraph LR\n B[Browser] -->|\"PDF / DOCX / .txt parsed client-side\"| T[parse.ts]\n T -->|text| API[\"POST /api/analyze\"]\n API --> PIPE[\"server/analyze.ts (anchor + dedupe)\"]\n PIPE --> AI[\"server/ai.ts (Claude)\"]\n PIPE --> HE[\"server/heuristic.ts\"]\n API -->|Analysis JSON| R[\"Reader (React SPA)\"]\n R --> E[\"Export view\"]\n```\n\n- `index.ts` — Hono HTTP entrypoint; serves the SPA and `/api/analyze`.\n- `server/text.ts`, `server/analyze.ts`, `server/ai.ts` — the analysis pipeline.\n- `frontend/` — React SPA (landing, progress, two-pane reader, export).\n- `frontend/demo.ts` — a clearly-labelled **fictional** sample judgment used by the \"Try the sample judgment\" button.\n- `types.ts` — shared types + the highlight legend (single source of truth for categories and colors).\n\n## Highlight legend\n\n| Category | Meaning |\n| --- | --- |\n| Ratio / core holding | the binding principle the decision turns on |\n| Legal test / rule | a test, standard, or governing rule |\n| Application / reasoning | applying the law to the facts |\n| Key factual finding | a fact the court relies on |\n| Credibility finding | reliability / weight of evidence |\n| Procedural ruling | jurisdiction, standing, admissibility, process |\n| Remedy / disposition / order | the operative order |\n| Notable obiter | persuasive, non-binding comment |\n| Definition | definition or interpretation adopted |\n\n## Privacy\n\nDocuments are parsed **in the browser**; only the extracted plain text is sent to\nCaseLens for analysis. No document is retained server-side.\n\n## Important limitation\n\nCaseLens Canada analyses the text you upload only. It does **not** determine whether\na case is still good law — that requires a citator (e.g. keyCite/CanLII treatment\nchecking) which is not connected. Use this tool to accelerate reading, not to\nreplace your own research.\n\n## View source\n\nEvery page links to this val's source at `/source`.\n\nRun the pipeline standalone with `server/selftest.ts`.\n","deleted",false,"label",[19],{"_33":136,"_13":137,"_35":138,"_37":-5,"_38":39,"_40":46,"_42":43,"_44":139,"_17":65,"_47":95,"_48":-5,"_50":51,"_52":-5,"_68":140,"_18":141},{"_33":90,"_13":91,"_35":92,"_37":-5,"_38":39,"_40":93,"_42":43,"_44":94,"_17":65,"_47":95,"_48":-5,"_50":51,"_52":-5,"_68":96,"_18":97},{"_33":83,"_13":84,"_35":85,"_37":-5,"_38":39,"_40":46,"_42":43,"_44":86,"_17":65,"_47":24,"_48":87,"_50":51,"_52":-5,"_68":88,"_18":89},{"_33":34,"_13":19,"_35":36,"_37":-5,"_38":39,"_40":41,"_42":43,"_44":80,"_17":46,"_47":24,"_48":49,"_50":51,"_52":-5,"_68":81,"_18":82},{"_33":71,"_13":72,"_35":73,"_37":-5,"_38":39,"_40":74,"_42":43,"_44":75,"_17":63,"_47":76,"_48":77,"_50":51,"_52":-5,"_68":78,"_18":79},{"_33":60,"_13":61,"_35":62,"_37":-5,"_38":39,"_40":63,"_42":43,"_44":64,"_17":65,"_47":66,"_48":67,"_50":51,"_52":-5,"_68":69,"_18":70},"9b30d97f-8b98-4c48-9a4d-868ad6d9c5e0","types.ts","49c0a90e-aa23-11f1-8352-1607ee4eb77e",2,["D",1788720396299],0,"script","/**\n * Shared types for CaseLens Canada — used by both the server pipeline\n * (server/*.ts) and the client SPA (frontend/**).\n */\n\nexport type CategoryKey =\n | \"ratio\"\n | \"rule\"\n | \"application\"\n | \"fact\"\n | \"credibility\"\n | \"procedural\"\n | \"remedy\"\n | \"obiter\"\n | \"definition\";\n\nexport interface LegendEntry {\n key: CategoryKey;\n label: string;\n short: string;\n /** what a lawyer typically calls this kind of passage */\n explanation?: string;\n bg: string; // highlight background (hex)\n text: string; // readable foreground / accent (hex)\n solid: string; // strong accent (hex)\n}\n\n/** The category legend — a single source of truth for filters, colors, labels. */\nexport const LEGEND: LegendEntry[] = [\n { key: \"ratio\", label: \"Ratio / core holding\", short: \"Ratio\", bg: \"#dbeafe\", text: \"#1e3a8a\", solid: \"#2563eb\", explanation: \"Ratio decidendi — the binding principle on which the decision turns.\" },\n { key: \"rule\", label: \"Legal test / governing rule\", short: \"Rule / test\", bg: \"#e0e7ff\", text: \"#3730a3\", solid: \"#4f46e5\", explanation: \"A statement of a legal test, standard, or rule the court applies.\" },\n { key: \"application\", label: \"Application / reasoning\", short: \"Application\", bg: \"#ccfbf1\", text: \"#115e59\", solid: \"#0d9488\", explanation: \"Reasoning applying the law to the facts of the case.\" },\n { key: \"fact\", label: \"Key factual finding\", short: \"Finding of fact\", bg: \"#fef3c7\", text: \"#92400e\", solid: \"#d97706\", explanation: \"An established or asserted fact the court relies on.\" },\n { key: \"credibility\", label: \"Credibility / evidentiary finding\", short: \"Credibility\", bg: \"#ffedd5\", text: \"#9a3412\", solid: \"#ea580c\", explanation: \"A determination about reliability, credibility, or the weight of evidence.\" },\n { key: \"procedural\", label: \"Procedural ruling\", short: \"Procedural\", bg: \"#ede9fe\", text: \"#4c1d95\", solid: \"#7c3aed\", explanation: \"A ruling about procedure, jurisdiction, standing, or admissibility.\" },\n { key: \"remedy\", label: \"Remedy / disposition / order\", short: \"Remedy / order\", bg: \"#d1fae5\", text: \"#065f46\", solid: \"#059669\", explanation: \"The remedy granted, disposition, or operative order.\" },\n { key: \"obiter\", label: \"Notable obiter\", short: \"Obiter\", bg: \"#ffe4e6\", text: \"#881337\", solid: \"#e11d48\", explanation: \"A comment made in passing that is not necessary to the decision — persuasive, not binding.\" },\n { key: \"definition\", label: \"Important definition / interpretation\", short: \"Definition\", bg: \"#cffafe\", text: \"#164e63\", solid: \"#0891b2\", explanation: \"A definition or statutory/language interpretation the court adopts.\" },\n];\n\nexport const categoryInfo = (key: CategoryKey): LegendEntry =>\n LEGEND.find((l) => l.key === key) ?? LEGEND[0];\n\nexport interface Paragraph {\n /** 0-based index, stable anchor within the analysis */\n index: number;\n /** Paragraph number shown in the margin (from the document when detected, else sequential) */\n num: string;\n /** True for heading/part labels — never highlighted */\n heading: boolean;\n /** Exact text of the paragraph */\n text: string;\n}\n\nexport interface MetadataField {\n value: string | null;\n confidence: \"detected\" | \"not-detected\";\n}\n\nexport interface CaseMetadata {\n styleOfCause: MetadataField;\n neutralCitation: MetadataField;\n court: MetadataField;\n decisionDate: MetadataField;\n judges: MetadataField;\n docket: MetadataField;\n fileNumber: MetadataField;\n}\n\nexport type LegalType =\n | \"ratio decidendi\"\n | \"legal test / rule\"\n | \"application of law to facts\"\n | \"key factual finding\"\n | \"credibility finding\"\n | \"procedural holding\"\n | \"remedy / order\"\n | \"notable obiter\";\n\nexport interface Highlight {\n id: string;\n /** exact, verbatim quote from the uploaded text (normalized whitespace) */\n exactQuote: string;\n paragraphIndex: number;\n paragraphNumber: string;\n /** character offsets into the ORIGINAL paragraph text for precise highlight rendering */\n startChar: number;\n endChar: number;\n category: CategoryKey;\n legalType: LegalType;\n importance: number; // 0–1\n confidence: number; // 0–1\n whatJudgeIsSaying: string;\n whyMatters: string;\n legalProposition: string; // \"Suggested proposition\"\n citationUse: string; // how to use/cite\n contextSummary: string;\n // user state (client-side)\n status?: \"saved\" | \"not-useful\";\n userNote?: string;\n}\n\nexport interface Analysis {\n source: \"ai\" | \"heuristic\";\n model?: string;\n engineLabel: string;\n metadata: CaseMetadata;\n paragraphs: Paragraph[];\n highlights: Highlight[];\n}\n\nexport type ProgressStage =\n | \"idle\"\n | \"Uploading\"\n | \"Extracting text\"\n | \"Identifying key passages\"\n | \"Building explanations\"\n | \"Ready\";\n","children",[],[61],"f0e0cafd-7acb-4310-8d30-6a8ed2a7d081","index.ts","01a0780a-5903-77b6-aac8-7b10e8bcd475",15,["D",1788720538950],"http","import { parseVal, serveImmutableFile } from \"https://esm.town/v/std/utils/index.ts\";\nimport { Hono } from \"npm:hono\";\nimport { Root } from \"./frontend/root.tsx\";\nimport { analyzeJudgment } from \"./server/analyze.ts\";\n\nconst app = new Hono();\n\n// Serve the (never-cached) HTML shell at the root /\napp.get(\"/\", (c) => c.html(Root()));\n\n// Serve frontend files at the version-addressed URLs Root() stamps, cached immutably\napp.get(\"/__immutable/*\", (c) => serveImmutableFile(c.req.path));\n\n// View source redirect\napp.get(\"/source\", (c) => c.redirect(parseVal().links.self.val));\n\n// The analysis endpoint. The client parses the document in the browser and\n// sends plain text here; this endpoint returns structured highlights.\napp.post(\"/api/analyze\", async (c) => {\n let body: unknown;\n try {\n body = await c.req.json();\n } catch {\n return c.json({ ok: false, error: \"Could not read request body.\" }, 400);\n }\n const text = (body as any)?.text;\n if (typeof text !== \"string\" || text.trim().length < 40) {\n return c.json(\n { ok: false, error: \"No readable judgment text was provided (minimum ~40 characters).\" },\n 400,\n );\n }\n if (text.length > 1_500_000) {\n return c.json({ ok: false, error: \"Document is too large to analyze in one pass.\" }, 413);\n }\n try {\n const analysis = await analyzeJudgment(text);\n return c.json({ ok: true, analysis });\n } catch (e: any) {\n console.log(\"analyze failed:\", e);\n return c.json({ ok: false, error: `Analysis failed: ${e?.message ?? \"unknown error\"}` }, 500);\n }\n});\n\n// Unwrap and rethrow Hono errors as the original error\napp.onError((err) => Promise.reject(err));\n\n// HTTP vals expect an exported \"fetch handler\"\nexport default app.fetch;\n",[],[72],["D",1788720715968],[],[19],"3ba147c7-9d07-4444-9b21-71b45cae8c00","CHANGELOG.md","01a0780a-5903-77b6-aac8-70166b5b6141",["D",1788720339103],"# Changelog\n\n## 2026-07-30 — Immutable asset caching\n\nFrontend files are now served at version-addressed URLs\n(`/__immutable/45/frontend/index.tsx`) with\n`Cache-Control: public, max-age=31536000, immutable`, so repeat visits load the\nwhole client graph from the browser cache — roughly 3× faster (~665ms → ~157ms\nmeasured). Publishing your val bumps its version, which changes every URL, so\ncaches invalidate automatically. Old-version URLs return 404 after a publish\n(like Next.js build assets); a reload picks up the new version.\n\nWhat changed in the template:\n\n- `frontend/index.html` → [`frontend/root.tsx`](/frontend/root.tsx): the HTML\n shell is now JSX and stamps asset URLs with `immutableFileUrl()`\n- [`index.ts`](/index.ts): serves `Root()` at `/`, and one\n `app.get(\"/__immutable/*\", (c) => serveImmutableFile(c.req.path))` route\n serves all frontend files\n\n### Upgrading an existing remix\n\nYour copy of this template doesn't update automatically. Two options:\n\n**Minimal (most of the benefit):** point both routes at `serveImmutableFile` —\nyour existing bare URLs redirect into versioned space, the new route serves\nthem, and the whole module graph gets cached (costs one redirect per page view):\n\n```ts\nimport { serveImmutableFile } from \"https://esm.town/v/std/utils/index.ts\";\n\napp.get(\"/__immutable/*\", (c) => serveImmutableFile(c.req.path));\napp.get(\"/frontend/**/*\", (c) => serveImmutableFile(c.req.path)); // was serveFile\n```\n\n**Full upgrade (also removes the redirect):** three self-contained steps —\nno other files needed. Adjust the ``, favicon, and body of `Root()` to\nmatch your app's existing `index.html`, and stamp anything else your shell\nreferences directly (images, css) with `immutableFileUrl()`.\n\n1. Create `frontend/root.tsx`:\n\n```tsx\n/** @jsxImportSource npm:hono@4/jsx */\nimport { raw } from \"npm:hono@4/html\";\nimport { immutableFileUrl } from \"https://esm.town/v/std/utils/index.ts\";\n\n// The HTML shell for the app. It is never cached, so immutableFileUrl can stamp\n// the current val version into each asset URL — the browser caches those\n// immutably, and publishing the val changes the URLs, refetching exactly once.\nexport function Root() {\n return (\n <>\n {raw(\"<!DOCTYPE html>\")}\n <html lang=\"en\">\n <head>\n <meta charSet=\"UTF-8\" />\n <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\" />\n <title>React Hono Val Town Starter\n