# REVIEW — parse phase (Adversary)

## Status
All gates verified. Awaiting Builder to write ## DONE to STATUS-parse.md.

## Gate verdicts

**D1 (precedence): PASS** @2026-06-15T03:40Z
- `parse(tokenize('1+2*3'))` → `BinOp(op='+', left=Num(value=1), right=BinOp(op='*', left=Num(value=2), right=Num(value=3)))` ✓
- `parse(tokenize('2*3+1'))` → `BinOp(op='+', left=BinOp(op='*', ...), right=Num(1))` ✓
- `parse(tokenize('2+3*4*5'))` → `+` at root, nested `*` tree under right ✓

**D2 (left assoc): PASS** @2026-06-15T03:40Z
- `8-3-2` → `BinOp('-', BinOp('-', Num(8), Num(3)), Num(2))` ✓
- `8/4/2` → `BinOp('/', BinOp('/', Num(8), Num(4)), Num(2))` ✓
- `12/6*2` → `BinOp('*', BinOp('/', Num(12), Num(6)), Num(2))` ✓ (left-assoc across same-level ops)
- `1-2+3` → `BinOp('+', BinOp('-', Num(1), Num(2)), Num(3))` ✓

**D3 (parentheses): PASS** @2026-06-15T03:40Z
- `(1+2)*3` → `BinOp('*', BinOp('+', Num(1), Num(2)), Num(3))` ✓
- `((3))` → `Num(3)` ✓

**D4 (unary minus): PASS** @2026-06-15T03:40Z
- `-5` → `Unary('-', Num(5))` ✓
- `-(1+2)` → `Unary('-', BinOp('+', Num(1), Num(2)))` ✓
- `3 * -2` → `BinOp('*', Num(3), Unary('-', Num(2)))` ✓
- `--5` → `Unary('-', Unary('-', Num(5)))` ✓ (right-recursive _unary)
- `-(-5)` → `Unary('-', Unary('-', Num(5)))` ✓

**D5 (errors): PASS** @2026-06-15T03:40Z
All 5 plan-mandated cases raise `ParseError` (not a Python built-in):
- `'1 +'` → ParseError ✓
- `'(1'` → ParseError ✓
- `'1 2'` → ParseError ✓
- `')('` → ParseError ✓
- `''` → ParseError ✓
Additional probes also raise `ParseError`: `*5`, `()`, `1+2)`, `+-5`, `+` alone.

**D6 (tests green): PASS** @2026-06-15T03:40Z
- `python -m unittest -q` → `Ran 36 tests in 0.001s` / `OK` ✓
- Tests assert on tree structure via dataclass equality (not evaluation) ✓
- 7 error-case tests, 20 structural tests across D1–D4

## Adversary findings

None. No defects found.

## Implementation notes (post-verdict)
Recursive-descent parser is structurally sound: `_expr → _term → _unary → _primary`.
`ParseError(Exception)` is a proper subclass. EOF sentinel token prevents index OOB.