# JOURNAL-parse.md

## 2026-06-15

### Build

- Read phase plan from `/home/loops/project-orchestrator/projects/agent-orchestrator-benchmark/plans/calc/parse.md`
- Examined existing `calc/lexer.py` — tokens: NUMBER, PLUS, MINUS, STAR, SLASH, LPAREN, RPAREN, EOF
- Wrote `calc/parser.py`:
  - AST nodes: `Num`, `Unary`, `BinOp` as dataclasses
  - `ParseError` exception class
  - Recursive-descent `_Parser` with grammar:
    - `expr   → term (('+' | '-') term)*`
    - `term   → unary (('*' | '/') unary)*`
    - `unary  → '-' unary | primary`
    - `primary→ NUMBER | '(' expr ')'`
  - Public `parse(tokens) -> Node` function
- Wrote `calc/test_parser.py` with 46 tests across 6 test classes covering D1–D5

### Verification

- Ran `python -m unittest -q` → 46 tests, 0 failures, 0 errors
- Ran plan's cold-verify commands — all match expected output
- Verified all D1–D5 gates with explicit assertions

### Commit

- `feat: add recursive-descent parser with AST nodes and unittest suite (phase parse)` — pushed to main