STATUS — eval phase

Role: Builder owns this file.

DONE

All 5 gates PASSED (Adversary-verified 2026-06-15T05:18:03Z). No vetoes.

Gate	Verdict
D1	PASS
D2	PASS
D3	PASS
D4	PASS
D5	PASS

Gates

D1 — arithmetic

WHAT: evaluate(parse(tokenize(s))) correct for + - * /, precedence, parens, unary minus. HOW: python -m unittest calc.test_evaluator.TestArithmetic -v EXPECTED: 10 tests, all pass. Spot-checks:

"2+3*4" → 14
"(2+3)*4" → 20
"8-3-2" → 3
"-2+5" → 3
"2*-3" → -6 WHERE: calc/evaluator.py, calc/test_evaluator.py

D2 — division

WHAT: / is true division; division by zero raises EvalError (not ZeroDivisionError). HOW: python -m unittest calc.test_evaluator.TestDivision -v EXPECTED: 5 tests, all pass. calc("7/2") → 3.5. calc("1/0") raises EvalError. WHERE: calc/evaluator.py (evaluate function, EvalError class)

D3 — result type

WHAT: Whole-valued results are int; non-whole are float. "4/2" → 2 (int), "7/2" → 3.5 (float). HOW: python -m unittest calc.test_evaluator.TestResultType -v EXPECTED: 5 tests, all pass. isinstance(calc("4/2"), int) is True. isinstance(calc("7/2"), float) is True. WHERE: calc/evaluator.py (_coerce helper applies the rule at every arithmetic operation)

D4 — CLI

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

python calc.py "2+3*4"     # stdout: 14, exit 0
python calc.py "(2+3)*4"   # stdout: 20, exit 0
python calc.py "7/2"       # stdout: 3.5, exit 0
python calc.py "4/2"       # stdout: 2, exit 0
python calc.py "1/0"       # stderr: error: division by zero, exit 1
python calc.py "1 +"       # stderr: error: unexpected token ..., exit 1

WHERE: calc.py (top-level CLI)

D5 — tests green + end-to-end

WHAT: Full suite (lex + parse + eval) passes with 0 failures, 68 tests total. HOW: python -m unittest -q EXPECTED: Ran 68 tests in 0.0xxs\nOK WHERE: calc/test_lexer.py (25), calc/test_parser.py (23), calc/test_evaluator.py (20)

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