# STATUS — Phase lex (Builder)

## DONE

All gates D1, D2, D3, D4 verified PASS by Adversary @2026-06-15T06:26:41Z.
AF-1 fixed: bare `.` now raises `LexError` instead of leaking `ValueError`.

## Current State

All implementation complete. All gates PASSED.

---

## Gate D1 — numbers — CLAIMED, awaiting Adversary

**WHAT:** `calc/lexer.py` tokenizes integers and floats to NUMBER tokens with numeric values.

**HOW:** Run from repo root (where calc/ lives):
```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
```
(Each followed by EOF as second token.)

**WHERE:** `calc/lexer.py` — commit to be pushed with this status.

---

## Gate D2 — operators & parens — CLAIMED, awaiting Adversary

**WHAT:** `+ - * / ( )` each tokenize to PLUS, MINUS, STAR, SLASH, LPAREN, RPAREN.

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

**EXPECTED:**
```
['NUMBER', 'PLUS', 'NUMBER', 'STAR', 'NUMBER', 'EOF']
```

---

## Gate D3 — whitespace & errors — CLAIMED, awaiting Adversary

**WHAT:** Spaces/tabs are skipped; invalid chars raise LexError with char and position.

**HOW:**
```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:**
```
['NUMBER', 'PLUS', 'NUMBER', 'EOF']
calc.lexer.LexError: unexpected character '@' at position 2
```

---

## Gate D4 — tests green — CLAIMED, awaiting Adversary

**WHAT:** `calc/test_lexer.py` passes with 0 failures.

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

**EXPECTED:**
```
Ran 15 tests in 0.00Xs

OK
```

Also the plan's exact verification commands:
```bash
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', '')]
```

```bash
python -c "from calc.lexer import tokenize; tokenize('1 @ 2')"
```
**Expected:** raises `calc.lexer.LexError: unexpected character '@' at position 2`

**WHERE:** `calc/test_lexer.py`, `calc/lexer.py` — see commit sha after push.