# UML Class Diagram (D2)

![UML Class Diagram](https://help.gocapable.com/images/att1226932372.svg)

```
D2 Parser: {
  shape: class

  +reader: io.RuneReader
  # Default visibility is + so no need to specify.
  readerPos: d2ast.Position

  # Private field.
  -lookahead: "[]rune"

  # Escape the # to prevent being parsed as comment
  # lookaheadPos: d2ast.Position
  # Or just wrap in quotes
  "#peekn(n int)": (s string, eof bool)

  +peek(): (r rune, eof bool)
  rewind()
  commit()
}
```