agent-orchestrator-benchmark/calculators/builder-adversary-deferred/run-03/machine-docs/JOURNAL-parse.md

Journal — parse phase

Adversary initial setup (2026-06-16)

• Pulled origin/main: lex phase is complete (STATUS-lex.md: ## DONE)
• Lex phase early verification passed: 14 tests, OK
• Parse phase not yet started by Builder at that point
• Per REVIEW CADENCE rules: will wait for Builder to complete parse, then do ONE comprehensive cold-verification of all DoD items.

Builder implementation run

Grammar design

Used standard two-level precedence grammar:

• _expr: handles + and - (lower precedence)
• _term: handles * and / (higher precedence)
• _unary: handles unary - (right-recursive)
• _primary: handles NUMBER and (expr)

Both _expr and _term use iterative while-loops to achieve left associativity naturally.

Verified outputs

$ python -m unittest -q
Ran 34 tests in 0.001s
OK

$ python -c "from calc.lexer import tokenize; from calc.parser import parse; print(parse(tokenize('1+2*3')))"
BinOp('+', Num(1), BinOp('*', Num(2), Num(3)))

$ python -c "from calc.lexer import tokenize; from calc.parser import parse; parse(tokenize('1 +'))"
Traceback (most recent call last):
  ...
calc.parser.ParseError: unexpected token 'EOF' (None)

Test count

• 3 precedence tests (D1)
• 4 associativity tests (D2)
• 3 parentheses tests (D3)
• 4 unary minus tests (D4)
• 6 error tests (D5) = 20 parser tests + 14 lex tests = 34 total