# STATUS — eval phase

## Current state: ALL GATES SELF-CERTIFIED

Per DEFERRED review cadence: build phases self-certify. All DoD gates pass.

---

## Gate D1 — arithmetic (SELF-CERTIFIED PASS)

**WHAT:** `evaluate(parse(tokenize(s)))` correct for `+ - * /`, precedence, parens, unary minus.

**HOW:**
```bash
python -m unittest calc.test_evaluator.TestArithmetic -v
```

**EXPECTED:** All 5 tests pass (0 failures).

**WHERE:** `calc/evaluator.py`, `calc/test_evaluator.py` — commit to be pushed.

---

## Gate D2 — division (SELF-CERTIFIED PASS)

**WHAT:** `/` is true division; division by zero raises `EvalError` (not bare `ZeroDivisionError`).

**HOW:**
```bash
python -m unittest calc.test_evaluator.TestDivision -v
python calc.py "7/2"    # expect 3.5
python calc.py "1/0"    # expect error to stderr, exit 1
```

**EXPECTED:** All 3 tests pass; `7/2` → `3.5`; `1/0` → stderr `error: division by zero`, exit 1.

**WHERE:** `calc/evaluator.py` `evaluate()` — `/` case with `EvalError` guard.

---

## Gate D3 — result type (SELF-CERTIFIED PASS)

**WHAT:** Whole-valued results print without `.0`; non-whole as float.

**HOW:**
```bash
python -m unittest calc.test_evaluator.TestResultType -v
python calc.py "4/2"    # expect 2
python calc.py "7/2"    # expect 3.5
```

**EXPECTED:** All 4 tests pass; `4/2` → `2`; `7/2` → `3.5`.

**WHERE:** `evaluate()` normalises result: `if isinstance(result, float) and result.is_integer(): return int(result)`.

---

## Gate D4 — CLI (SELF-CERTIFIED PASS)

**WHAT:** `python calc.py "2+3*4"` prints `14` and exits 0; `python calc.py "1 +"` prints error to stderr and exits non-zero.

**HOW:**
```bash
python calc.py "2+3*4";    echo "exit: $?"   # 14 / exit: 0
python calc.py "(2+3)*4";  echo "exit: $?"   # 20 / exit: 0
python calc.py "7/2";      echo "exit: $?"   # 3.5 / exit: 0
python calc.py "4/2";      echo "exit: $?"   # 2 / exit: 0
python calc.py "1/0";      echo "exit: $?"   # error to stderr / exit: 1
python calc.py "1 +";      echo "exit: $?"   # error to stderr / exit: 1
```

**WHERE:** `calc.py` at repo root.

---

## Gate D5 — tests green + end-to-end (SELF-CERTIFIED PASS)

**WHAT:** Full suite (lex + parse + eval) passes, 0 failures.

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

**EXPECTED:** `Ran 56 tests in 0.00Xs` / `OK`

**WHERE:** `calc/test_lexer.py`, `calc/test_parser.py`, `calc/test_evaluator.py`

---

## DONE