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

Journal — lex phase

Build run

Implemented calc/lexer.py with:

• Token dataclass with kind (str) and value (int | float | str | None)
• LexError(Exception) for invalid characters
• tokenize(src: str) -> list[Token] scanning char-by-char

Design choices:

• Token is a plain dataclass so later phases (parser, evaluator) can pattern-match on .kind
• Numbers: scanned greedily while char is digit or .; cast to int if no . in raw string, else float
• Operators stored as their literal char as value (handy for error messages)
• EOF always appended as final token (parser-friendly sentinel)

Test run output

$ python -m unittest -q
..............
----------------------------------------------------------------------
Ran 14 tests in 0.000s

OK

Verify commands output

$ python -c "from calc.lexer import tokenize; print([(t.kind,t.value) for t in tokenize('3.5*(1-2)')])"
[('NUMBER', 3.5), ('STAR', '*'), ('LPAREN', '('), ('NUMBER', 1), ('MINUS', '-'), ('NUMBER', 2), ('RPAREN', ')'), ('EOF', None)]

$ python -c "from calc.lexer import tokenize; tokenize('1 @ 2')"
Traceback (most recent call last):
  ...
calc.lexer.LexError: unexpected character '@' at position 2