# crates/

These crates implement the rule-based lesson checker whose semantics are
pinned by the ADRs in `docs/adr/`: it reads an engineering-file (one lesson,
ADR-0005)
laid out per ADR-0008 (declarative `manifest.toml` + per-element
`element.toml`), validates structure and content, and emits diagnostics.
`cph-diag` (the shared diagnostic vocabulary), `cph-model` (the ADR-0008 loader),
and `cph-typst` (the typst `World` / compile / span-mapping layer) are
deliberately reusable by future components such as an `exporter`, which is why
they live in this repo-wide `crates/` directory rather than under any single
component; `cph-schema` (kind JSON Schemas + validation), `cph-check`
(orchestration + render-coverage) and `cph-cli` (the `cph` command-line
entrypoint) are the checker proper.

## Crate map

| crate         | owner | role |
|---------------|-------|------|
| `cph-diag`    | WU-1  | shared diagnostic vocabulary (`Severity`, `DiagCode`, `Diagnostic`, `SourceSpan`) — reusable |
| `cph-model`   | WU-1  | parses the ADR-0008 layout into an in-memory ordered `Lesson` — reusable |
| `cph-schema`  | WU-3  | the 4 stdlib kind JSON Schemas + structural validation |
| `cph-typst`   | WU-4  | typst `World`, driver generation, compile, PDF, span mapping — reusable |
| `cph-check`   | WU-5  | orchestration: render-coverage and the full check pipeline |
| `cph-cli`     | WU-5  | the `cph` command-line entrypoint |

## Build

```sh
# from the repository root (the cargo workspace root)
cargo build      # all crates
cargo test       # cph-diag + cph-model unit/integration tests
cargo clippy --all-targets -- -D warnings
cargo fmt --check
```
