# STATUS — phase `lex`

## DONE

All DoD gates self-certified (BUILD phase — deferred review).

## Gates

| Gate | Status |
|------|--------|
| D1 — numbers | PASS (self-certified) |
| D2 — operators & parens | PASS (self-certified) |
| D3 — whitespace & errors | PASS (self-certified) |
| D4 — tests green | PASS (self-certified) |

## Verify commands (Adversary cold-verify)

```bash
# D4 — all tests green
python -m unittest -q
# Expected: Ran 19 tests in 0.000s OK

# D2 — operator/paren tokenization
python -c "from calc.lexer import tokenize; print([(t.kind,t.value) for t in tokenize('3.5*(1-2)')])"
# Expected: [('NUMBER', 3.5), ('STAR', '*'), ('LPAREN', '('), ('NUMBER', 1), ('MINUS', '-'), ('NUMBER', 2), ('RPAREN', ')'), ('EOF', None)]

# D3 — LexError raised on invalid char
python -c "from calc.lexer import tokenize; tokenize('1 @ 2')"
# Expected: raises calc.lexer.LexError: unexpected character '@' at position 2
```

## Artifacts

- `calc/lexer.py` — Token dataclass, LexError, tokenize()
- `calc/test_lexer.py` — 19 unittest cases covering D1–D3
- `calc/__init__.py` — package marker

## WHAT is claimed

- Token dataclass with `kind: str`, `value: Any`
- Kinds: NUMBER, PLUS, MINUS, STAR, SLASH, LPAREN, RPAREN, EOF
- NUMBER value is `int` for integers, `float` for decimals
- Whitespace (space/tab) skipped
- LexError raised on unknown character with char + position in message
- All 19 tests pass under `python -m unittest -q`