# STATUS — lex phase (Builder)

## DONE

All DoD gates (D1–D4) verified PASS by Adversary @2026-06-15T06:09:05Z. No veto. Phase complete.

## Gates

### D1 — numbers: **CLAIMED** — awaiting Adversary
**WHAT:** `tokenize("42")` → `[Token(NUMBER, 42), Token(EOF, None)]`; floats `3.14`, `.5`, `10.` each produce one NUMBER token with numeric value (int or float).

**HOW to verify:**
```bash
python -c "from calc.lexer import tokenize; t=tokenize('42'); print(t[0].kind, t[0].value, type(t[0].value).__name__)"
python -c "from calc.lexer import tokenize; t=tokenize('3.14'); print(t[0].kind, t[0].value, type(t[0].value).__name__)"
python -c "from calc.lexer import tokenize; t=tokenize('.5'); print(t[0].kind, t[0].value, type(t[0].value).__name__)"
python -c "from calc.lexer import tokenize; t=tokenize('10.'); print(t[0].kind, t[0].value, type(t[0].value).__name__)"
```

**EXPECTED:**
```
NUMBER 42 int
NUMBER 3.14 float
NUMBER 0.5 float
NUMBER 10.0 float
```

**WHERE:** `calc/lexer.py` — `tokenize()` function

---

### D2 — operators & parens: **CLAIMED** — awaiting Adversary
**WHAT:** `+ - * / ( )` tokenize to `PLUS MINUS STAR SLASH LPAREN RPAREN`; `tokenize("1+2*3")` → `NUMBER PLUS NUMBER STAR NUMBER EOF`

**HOW to verify:**
```bash
python -c "from calc.lexer import tokenize; print([t.kind for t in tokenize('1+2*3')])"
python -c "from calc.lexer import tokenize; print([t.kind for t in tokenize('+-*/()')] )"
```

**EXPECTED:**
```
['NUMBER', 'PLUS', 'NUMBER', 'STAR', 'NUMBER', 'EOF']
['PLUS', 'MINUS', 'STAR', 'SLASH', 'LPAREN', 'RPAREN', 'EOF']
```

**WHERE:** `calc/lexer.py` — `_SINGLE` dict and `tokenize()`

---

### D3 — whitespace & errors: **CLAIMED** — awaiting Adversary
**WHAT:** Spaces/tabs skipped; invalid chars raise `LexError` with offending char and position.

**HOW to verify:**
```bash
python -c "from calc.lexer import tokenize; print([t.kind for t in tokenize('  12  +  3 ')])"
python -c "from calc.lexer import tokenize; tokenize('1 @ 2')"
```

**EXPECTED:**
- First command: `['NUMBER', 'PLUS', 'NUMBER', 'EOF']`
- Second command: raises `calc.lexer.LexError: unexpected character '@' at position 2`

**WHERE:** `calc/lexer.py` — whitespace skip + `LexError` raise

---

### D4 — tests green: **CLAIMED** — awaiting Adversary
**WHAT:** `calc/test_lexer.py` runs 24 tests, 0 failures under `python -m unittest`

**HOW to verify:**
```bash
python -m unittest -q
```

**EXPECTED:**
```
----------------------------------------------------------------------
Ran 24 tests in 0.000s

OK
```

**WHERE:** `calc/test_lexer.py`

---