# STATUS-lex

Commit: 70b71caacd1f7334e387ff15b007573201b524b6

## Gate Results

### D1 — numbers

**Check:** `tokenize("42")` → `[NUMBER(42), EOF]`; also `.5`, `3.14`, `10.` tokenize to float NUMBER.

**Command:**
```bash
python -c "from calc.lexer import tokenize; print([(t.kind,t.value) for t in tokenize('42')])"
```

**Expected:** `[('NUMBER', 42), ('EOF', None)]`

**Observed:** `[('NUMBER', 42), ('EOF', None)]` ✓

Additional verified: `.5` → `NUMBER(0.5, float)`, `10.` → `NUMBER(10.0, float)`, `3.14` → `NUMBER(3.14, float)`

**Result: PASS**

---

### D2 — operators & parens

**Check:** `tokenize("1+2*3")` → `NUMBER PLUS NUMBER STAR NUMBER EOF`

**Command:**
```bash
python -c "from calc.lexer import tokenize; print([t.kind for t in tokenize('1+2*3')])"
```

**Expected:** `['NUMBER', 'PLUS', 'NUMBER', 'STAR', 'NUMBER', 'EOF']`

**Observed:** `['NUMBER', 'PLUS', 'NUMBER', 'STAR', 'NUMBER', 'EOF']` ✓

All operator kinds verified: PLUS, MINUS, STAR, SLASH, LPAREN, RPAREN.

**Result: PASS**

---

### D3 — whitespace & errors

**Check 1 (whitespace):** `"  12  +  3 "` → `NUMBER PLUS NUMBER EOF`

**Command:**
```bash
python -c "from calc.lexer import tokenize; print([(t.kind,t.value) for t in tokenize('  12  +  3 ')])"
```

**Expected:** `[('NUMBER', 12), ('PLUS', '+'), ('NUMBER', 3), ('EOF', None)]`

**Observed:** `[('NUMBER', 12), ('PLUS', '+'), ('NUMBER', 3), ('EOF', None)]` ✓

**Check 2 (LexError):** `"1 @ 2"` raises `LexError` with `@` and position in message.

**Command:**
```bash
python -c "from calc.lexer import tokenize; tokenize('1 @ 2')"
```

**Expected:** `LexError: Invalid character '@' at position 2`

**Observed:**
```
calc.lexer.LexError: Invalid character '@' at position 2
```
✓

**Result: PASS**

---

### D4 — tests green

**Command:**
```bash
python -m unittest -q
```

**Expected:** 0 failures

**Observed:**
```
----------------------------------------------------------------------
Ran 18 tests in 0.000s

OK
```
✓

**Result: PASS**

---

### Plan verification commands

```bash
python -m unittest -q
# Ran 18 tests in 0.000s / OK

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')"
# calc.lexer.LexError: Invalid character '@' at position 2
```

## DONE