Conditional groups / Alternatives

[ematipico]

Alternatives are a way to express different IRs, and the printer decides which ones best fits the situation.

Requirements:

• at least two alternatives must be passed;

• each alternative should be print flat and bail if it can't fit; if all alternatives don't fit in one line, print the last one in flat mode;

• alternatives should be placed from the one line version to the most multi line version, e.g.:

  ```
  [
      (something.in.one.line),
      (something.in.\n.one.line),
      (something\n.in\n.one\n.line)
  ]
  ```
  

• the logic of fitting an alternative should be different from the normal logic. At the moment current flatting logic of the printer stops when it finds a hard line break. If so, it rolls back to it's previous state and it print everything in multi line mode. For alternatives, should go in a different way and flat them progressively until we find an hardline break. This is only a concept and it should be verified during the implementation if that's what we need

• during the flatting mode, the printer should choose the first alternative as element to print