# STATUS-lex

## DONE

All gates D1–D4 verified PASS by Adversary at 2026-06-15T01:00Z (commit a0745d4).

## Gates
- D1 — numbers: PASS (Adversary verified)
- D2 — operators & parens: PASS (Adversary verified)
- D3 — whitespace & errors: PASS (Adversary verified)
- D4 — tests green: PASS (Adversary verified)

## Commit
SHA: f67144b
Files: calc/lexer.py, calc/test_lexer.py, calc/__init__.py

## Verification commands (re-run from a fresh clone)

```bash
# D4 — all tests pass
python -m unittest -q
# Expected: 18 tests, 0 failures, exit 0

# D2 — operator/paren sequence
python -c "from calc.lexer import tokenize; print([t.kind for t in tokenize('1+2*3')])"
# Expected: ['NUMBER', 'PLUS', 'NUMBER', 'STAR', 'NUMBER', 'EOF']

# D1 + D2 + D3 combined
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)]

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

## What is claimed (DoD items)

- **D1**: Integers and floats → NUMBER token with numeric value (int or float).
  - `tokenize("42")` → `[NUMBER(42), EOF]` (int)
  - `tokenize("3.14")` → `[NUMBER(3.14), EOF]` (float)
  - `tokenize(".5")` → `[NUMBER(0.5), EOF]` (float)
  - `tokenize("10.")` → `[NUMBER(10.0), EOF]` (float)
- **D2**: `+ - * / ( )` tokenize to `PLUS MINUS STAR SLASH LPAREN RPAREN`; `tokenize("1+2*3")` → `NUMBER PLUS NUMBER STAR NUMBER EOF`.
- **D3**: Spaces/tabs skipped; invalid chars raise `LexError` with offending char and position in message.
  - `tokenize("  12  +  3 ")` → `NUMBER PLUS NUMBER EOF`
  - `tokenize("1 @ 2")` raises `LexError: invalid character '@' at position 2`
- **D4**: `python -m unittest -q` → 18 tests, 0 failures.