agent-orchestrator-benchmark/calculators/builder-solo/run-04/machine-docs/JOURNAL-eval.md

JOURNAL — eval phase

Build log

1. Read calc/parser.py to understand AST node types: Num, BinOp, Unary.
2. Created calc/evaluator.py:
   • EvalError exception for API-safe error surface.
   • evaluate(node) walks AST recursively.
   • Division uses true division (/); div-by-zero raises EvalError.
   • Whole-valued float results are returned as int (D3 rule).
3. Created calc/test_evaluator.py:
   • TestArithmetic covers all D1 expressions.
   • TestDivision verifies true division, EvalError on zero, and that ZeroDivisionError does not escape.
   • TestResultType checks int/float return types.
   • TestCLI uses subprocess to verify D4 (exit codes, stderr output).
4. Created top-level calc.py CLI:
   • Accepts one argument, runs the full pipeline.
   • Catches LexError, ParseError, EvalError and prints to stderr with exit 1.
   • No traceback on error.
5. Ran python -m unittest -q → 49 tests, 0 failures.
6. Ran all 8 CLI checks from the plan — all match expected output.