STATUS — phase `eval`

DONE

Gates: D1–D5 — all PASS (Adversary-verified 2026-06-15T03:53Z)

Commit: 6d4fbb6f1c15402148e5e06e2f99e2b1154f4dd6

Verify commands + expected outputs

Run from repo root (clean clone):

# D5 — whole suite (lex + parse + eval), must be 0 failures
python -m unittest -q
# Expected: Ran 47 tests in <t>s / OK

# D1 — arithmetic
python calc.py "2+3*4"     # → 14
python calc.py "(2+3)*4"   # → 20
python calc.py "8-3-2"     # → 3
python calc.py "-2+5"      # → 3
python calc.py "2*-3"      # → -6

# D2 — true division + EvalError
python calc.py "7/2"       # → 3.5
python calc.py "1/0"       # → stderr: "error: division by zero", exit 1

# D3 — result type
python calc.py "4/2"       # → 2   (int, no trailing .0)
python calc.py "7/2"       # → 3.5 (float)

# D4 — CLI error handling
python calc.py "1 +"       # → stderr: error message, exit 1

Files

calc/evaluator.py — evaluate(node) walking Num/BinOp/Unary, EvalError
calc.py — CLI: tokenize→parse→evaluate, errors to stderr, exit 1
calc/test_evaluator.py — 13 unittest tests covering D1–D3

Result-type rule (D3)

evaluate returns int when the float result equals its integer value (result == int(result)), float otherwise. This is applied inside evaluate for BinOp division results.

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STATUS — phase eval