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\n ◆ For Canadian courts & tribunals\n

\n CaseLens Canada\n

\n Upload a judgment and read it with the key passages highlighted. CaseLens finds the\n citation-worthy law — the ratio, the tests, the findings — anchors each quote\n verbatim to the paragraph, and explains in plain language why it matters and how to cite it.\n

\n\n !busy && inputRef.current?.click()}\n onKeyDown={(e) => {\n if ((e.key === \"Enter\" || e.key === \" \") && !busy) inputRef.current?.click();\n }}\n onDragOver={(e) => {\n e.preventDefault();\n setDragOver(true);\n }}\n onDragLeave={() => setDragOver(false)}\n onDrop={(e) => {\n e.preventDefault();\n setDragOver(false);\n if (busy) return;\n const files = Array.from(e.dataTransfer.files ?? []);\n if (files.length) onFiles(files);\n }}\n className={\n \"border-2 border-dashed rounded-2xl py-14 px-8 text-center transition-colors focus:outline-none focus:ring-4 focus:ring-amber-200 cursor-pointer \" +\n (dragOver ? \"border-amber-500 bg-amber-50\" : \"border-charcoal/25 bg-white hover:border-charcoal/50 hover:bg-charcoal/[0.02]\")\n }\n >\n {busy ? (\n

\n \n

Processing…

\n ) : (\n

📄

Drag & drop a judgment here, or browse

Accepts PDF, DOCX, and plain-text (.txt)

\n {\n const files = Array.from(e.target.files ?? []);\n if (files.length) onFiles(files);\n e.target.value = \"\";\n }}\n />\n

\n )}\n

\n\n

\n Files are parsed in your browser — nothing is uploaded for extraction.\n

\n\n

\n \n Try the sample judgment 〈no upload needed〉\n \n

\n\n

What it does

• Parses paragraph structure, numbers, headings, citation, court, date, judges, docket.
• Flags citation-worthy passages and quotes them verbatim in place.
• Explains each passage: what the judge is saying, why it matters, legal type, and how to cite it.
• Never invents citations or case law beyond the text you upload.

Highlight legend

\n \n {l.label}\n

\n\n

\n CaseLens Canada analyses the text of the judgment you upload. It does not check whether a case is\n still good law, and is not a substitute for your own legal research.\n

\n view source\n

\n \n );\n}\n\nfunction Loader() {\n return (\n

\n \n \n \n

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// 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","label",[143],"f0e0cafd-7acb-4310-8d30-6a8ed2a7d081","index.ts",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",[153],"362d2787-1892-450e-a045-b1158ca752a2","README.md","01a0780a-5903-77b6-aac8-7592d4e98454",1,["D",1788720339103],"# React + Hono Starter\n\nA minimal starter template for building client-side React apps with a Hono\nbackend on Val Town. Click **Remix** to get your own copy.\n\n## Picking a starter\n\n| Starter | When to pick it |\n| --- | --- |\n| [`basic-html-starter`](https://www.val.town/x/templates/basic-html-starter) | Static HTML pages. Sprinkle of vanilla JS. No server-side rendering. |\n| [`hono-jsx-starter`](https://www.val.town/x/templates/hono-jsx-starter) | Dynamic server-rendered HTML with JSX. API routes. No React, no SPA. |\n| **[`react-hono-starter`](https://www.val.town/x/templates/react-hono-starter)** *(you're here)* | Client-side React SPA with a Hono API backend. |\n\n**Want to build UI?** Start writing React components in\n[`frontend/components/`](/frontend/components/). Import them into `App.tsx` and\nyou're good to go. Styling is [Twind](https://twind.style/) — just use Tailwind\nutility classes, zero config.\n\n**Want to add an API?** Add routes in [`index.ts`](/index.ts) (there's a\ncommented-out example). Fetch them from your React components.\n\n## Architecture\n\n```mermaid\ngraph LR\n Browser -->|\"GET /\"| Hono[\"index.ts
(Hono server)\"]\n Hono -->|serves| HTML[\"root.tsx\"]\n HTML -->|loads| Entry[\"index.tsx\"]\n Entry -->|renders| App[\"App.tsx\"]\n App -->|renders| Counter[\"Counter.tsx\"]\n```\n\n## File structure\n\n```\nindex.ts ← Hono backend (serves frontend + API routes)\nfrontend/\n root.tsx ← HTML shell (stamps immutable asset URLs)\n index.tsx ← React entrypoint (mounts )\n favicon.svg ← App icon\n components/\n App.tsx ← Root component (layout + view source link)\n Counter.tsx ← Example component with state\n```\n\n## How it works\n\n1. **`index.ts`** is the HTTP entrypoint — a Hono server that serves the\n frontend and any API routes you add.\n2. **`frontend/root.tsx`** is the HTML shell — it loads Twind and stamps\n immutable asset URLs for the favicon and React entrypoint.\n3. **`frontend/index.tsx`** mounts the React app.\n4. **`frontend/components/App.tsx`** is the root layout — add new components\n alongside it.\n5. **`frontend/components/Counter.tsx`** is an example stateful component —\n replace it with your own!\n\n## Next steps\n\n- Add API routes in `index.ts`\n- Add new components in `frontend/components/`\n- Add a SQLite database — see the\n [React Hono Example](https://www.val.town/x/stevekrouse/reactHonoExample) for\n a full-stack example with database, queries, and shared types\n\nTemplate updates and upgrade paths for existing remixes: [CHANGELOG.md](/CHANGELOG.md)\n",[160],"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

Diff · v20