Example 1: Compiler I/O

• The conventional design:

  • scanner: getToken(... getChar() ...)
  • parser: parse(... getToken() ...)

• The conventional motivation:

  • minimise memory requirements

• The new truth:

  • memory capacity grows fast
  • the size of a program component doesn't

• The conventional design is bad because:

  • it mixes issues which should be separate
  • it doesn't allow for IDEs or backtracking