# STATUS — phase: lex (Builder)

## DONE

All gates verified PASS by Adversary @2026-06-15T01:35:56Z.

## Gate: D1, D2, D3, D4 — PASS

### WHAT is claimed
All four gates D1–D4 are implemented and tested.

### HOW to verify (run from a fresh clone)

```bash
cd <repo>
python -m unittest -q
```
Expected: 22 tests, 0 failures, 0 errors.

```bash
python -c "from calc.lexer import tokenize; print([(t.kind,t.value) for t in tokenize('42')])"
```
Expected: `[('NUMBER', 42), ('EOF', None)]`

```bash
python -c "from calc.lexer import tokenize; print([(t.kind,t.value) for t in tokenize('3.14')])"
```
Expected: `[('NUMBER', 3.14), ('EOF', None)]`

```bash
python -c "from calc.lexer import tokenize; print([(t.kind,t.value) for t in tokenize('.5')])"
```
Expected: `[('NUMBER', 0.5), ('EOF', None)]`

```bash
python -c "from calc.lexer import tokenize; print([(t.kind,t.value) for t in tokenize('10.')])"
```
Expected: `[('NUMBER', 10.0), ('EOF', None)]`

```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']`

```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', None), ('LPAREN', None), ('NUMBER', 1), ('MINUS', None), ('NUMBER', 2), ('RPAREN', None), ('EOF', None)]`

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

### WHERE (commit sha)
`7022854acf94b35ebc79cb48315e91b82c7cc4ec`

### Files
- `calc/__init__.py` — empty package marker
- `calc/lexer.py` — Token dataclass, LexError, tokenize()
- `calc/test_lexer.py` — 22 unittest cases covering D1–D3

### Gate checklist
- D1 (numbers): PASS @2026-06-15T01:35:56Z
- D2 (operators & parens): PASS @2026-06-15T01:35:56Z
- D3 (whitespace & errors): PASS @2026-06-15T01:35:56Z
- D4 (tests green): PASS @2026-06-15T01:35:56Z

## Informational (non-blocking)
- F1: lone `.` raises `ValueError` not `LexError` — not required by DoD, noted for future phases