tegwick
f32b500f44
Add ./selectors and ./types subpath exports so node-env consumers get a pdfjs-free entry (the umbrella roundtrip test uses them). Update README status to 'extracted; umbrella consumes this package'. Mark T05 done; record the blocker as resolved. Umbrella verified green (typecheck, 95 tests, build) at citation-evidence@d145148. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
92 lines
4.4 KiB
Markdown
92 lines
4.4 KiB
Markdown
# evidence-anchor
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Selector creation, resolution, and the `DocumentViewerAdapter` contract that
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every document viewer in the citation-evidence workspace implements. This repo
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turns annotations from static marks into durable, reopenable source references.
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- **Owns:** selector *behavior* — `createSelectors`, `resolveSelectors`, PDF
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selector math, the viewer-adapter contract, and highlight/scroll helpers.
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- **Does not own:** selector *type interfaces* — those live in `citation-engine`
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(`shared/selector`). See `ADR-0006` and `SharedContracts.md` §8.
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- **May depend on:** `citation-engine` only (DependencyMap §4). Nothing from
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`binder/`, `source/`, or `work/` may flow back into it.
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See `SCOPE.md` for the boundary and `INTENT.md` for the long-range intent.
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## Status: extracted; umbrella consumes this package
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The anchor slice has been extracted from the umbrella and now lives here.
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`citation-evidence` consumes it as `@citation-evidence/evidence-anchor`
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(`link:../evidence-anchor`); its former `src/anchor/` directory is gone and the
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`@anchor` alias is retired. Shared-contract changes still happen in the umbrella
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(`citation-evidence/wiki/`), not here.
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Remaining anchor work beyond this MVP slice (stale/orphan semantics, fuzzy
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re-anchoring, HTML/Markdown selectors, promoting the PDF spike to a production
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adapter) is tracked as follow-on work — see `workplans/`.
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## Install model
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Sibling-checkout, linked-package model — this repo is checked out next to its
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consumers and consumed via a local link (e.g. `link:../evidence-anchor`), not
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published to a registry during MVP. Its only shared-type dependency is
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`citation-engine`, imported through the engine's public `shared` entrypoint
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(`@citation-evidence/engine/shared`) rather than umbrella-only `@shared/*`
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aliases.
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## Package layout (initial extracted version)
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```text
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src/
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index.ts public entrypoint — full barrel (core + pdf)
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types.ts adapter-side types: SelectionCapture,
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ResolvedAnchorTarget, AnchorResolution,
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HighlightRenderOptions, DocumentViewerAdapter
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css.d.ts ambient decl for side-effect .css imports
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selectors/ pure core — no viewer/UI deps
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index.ts createSelectors, resolveSelectors, DEFAULT_CONTEXT_CHARS
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create.ts selector creation from a captured selection
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resolve.ts resolution + the exact-match confidence ladder
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create.test.ts
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resolve.test.ts
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pdf/ adapter boundary — the only place viewer libs live
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index.ts subpath entry `evidence-anchor/pdf`
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pdf-selector-math.ts pure page + normalized-rect math (capture↔selectors)
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pdf-selector-math.test.ts
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pdf-viewer-adapter-spike.tsx concrete PDF adapter (PdfSpikeViewer)
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scroll-job.ts retryable scroll-to-highlight helper
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scroll-job.test.ts
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highlight-styles.css highlight rendering styles
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debug-textlayer.css optional text-layer debugging styles
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```
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Boundary rules for the layout (enforced by `eslint.config.js`):
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- viewer-library imports (`pdfjs-dist`, `react`, `react-pdf-highlighter-plus`)
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are confined to `src/pdf/` — the pure zone (`src/selectors/**`, `src/types.ts`)
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may not import them;
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- `src/selectors/` is pure and depends only on `citation-engine` shared types;
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- the **root** entrypoint (`evidence-anchor`) is the full barrel — selector
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creation/resolution, the adapter types/contract, and the PDF adapter — so
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consumers resolve every anchor symbol (and their test `vi.mock(...)` calls)
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from a single specifier, matching the umbrella's prior `@anchor/index`;
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- a focused, viewer-free entry is also published at **`evidence-anchor/pdf`**
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for consumers that want the PDF surface explicitly. The concrete adapter is
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still the explicitly-named `PdfSpikeViewer` spike; promoting it to a
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production `PDFViewerAdapter` is registered follow-on work (T06).
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## Public API (target surface)
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```ts
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import {
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createSelectors,
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resolveSelectors,
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type DocumentViewerAdapter,
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type AnchorResolution,
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} from "@citation-evidence/evidence-anchor";
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```
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Resolution is explicit about uncertainty — `AnchorResolution.status` is one of
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`resolved` / `ambiguous` / `unresolved` / `stale` with a `0..1` confidence, so a
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caller can highlight, ask the user to confirm, or mark a citation stale rather
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than silently highlight the wrong passage.
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