# `CefrLevel`

A level of the Common European Framework of Reference for Languages, written `B2`.

[Other with a published standard](types.md#other-with-a-published-standard); not ordered; since Jadpo 0.1.0.

## Make one

Pick one of its variants, `CefrLevel.a1`.

`text.parse(raw, as: CefrLevel)` reads one from its text; text that isn't one at all fails `malformed`, such as `C3`, `B` or `native`.

## Variants

| Variant | Written |
|---|---|
| `a1` | `A1` |
| `a2` | `A2` |
| `b1` | `B1` |
| `b2` | `B2` |
| `c1` | `C1` |
| `c2` | `C2` |

## Text, JSON and storage

`text.from` writes its canonical text, the one form `text.parse` reads back. JSON sends its canonical text as a string.

| Text | JSON |
|---|---|
| `A1` | `"A1"` |
| `B2` | `"B2"` |
| `C2` | `"C2"` |

It is stored in one column named for the field, of type `text`. `B2` is stored as `'B2'`.

## Shown to people

`text.format(value, locale:)` shows it to people in their locale.

With `locale: Locale.en_gb`:

| Value | Shown |
|---|---|
| `A1` | `A1` |
| `B2` | `B2` |
| `C2` | `C2` |

## Operations

It has the contract's own operations: `text.parse`, `text.from`, `text.format`, `json.read`, `json.write` and `==`. It isn't ordered, so `<` and sorting don't take it. [Every standard type meets one contract](../topics/every-standard-type-meets-one-contract.md) says how they work.