2201-initial-recognition-overlap.yaml

version: 1
name: Structure recognition - precluding initial overlaps
description: |
  A cell may be a member of at most one structure.

  Since recognition of pre-placed structures bypasses
  the regular "search" process, we need to ensure that
  overlaps are properly excluded by this alternate mechanism.
  In this scenario, only the upper-left structure should be recognized,
  based on the precedence criteria (structure size, then grid location)
creative: false
objectives:
  - teaser: Recognize exactly one structure
    goal:
      - |
        `square`{=structure} structure should be recognized upon scenario start.
      - |
        Although two of these structures were initially placed, only
        the upper-left one should be recognized.
    condition: |
      def length : (rec l. Unit + a * l) -> Int = \l.
        case l (\_. 0) (\c. match c \_. \tl. 1 + length tl)
      end;
      foundStructures <- structures "square";
      pure $ length foundStructures == 1;
robots:
  - name: base
    dir: north
    devices:
      - ADT calculator
      - blueprint
      - fast grabber
      - logger
      - treads
solution: |
  noop;
structures:
  - name: square
    recognize: [north]
    structure:
      palette:
        'x': [stone, rock]
      mask: '.'
      map: |
        xx
        xx
known: [rock]
world:
  dsl: |
    {blank}
  palette:
    '.': [grass, erase]
    'B': [grass, erase, base]
    's':
      structure:
        name: square
      cell: [grass]
  upperleft: [0, 0]
  map: |
    ...s...
    ....s..
    .B.....