# BACKLOG — lex phase

## Build backlog

- [x] D1 — NUMBER token for integers and floats (int/float value)
- [x] D2 — PLUS, MINUS, STAR, SLASH, LPAREN, RPAREN, EOF tokens
- [x] D3 — skip whitespace (space/tab); raise LexError on invalid char
- [x] D4 — calc/test_lexer.py passing 20 unittest cases

All items complete.

## Adversary findings

_(No findings yet.)_