Class: SwitchGroup

Inherits:
Object
  • Object
show all
Defined in:
lib/whatnot/switch_group.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(nums = [], min_on: 1, max_on: 1) ⇒ SwitchGroup

Returns a new instance of SwitchGroup.



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# File 'lib/whatnot/switch_group.rb', line 4

def initialize(nums=[], min_on: 1, max_on: 1)
  @min_on = min_on
  @max_on = max_on
  @switches = []
  @possibilities = []

  if block_given?
    Switch.each do |switch|
      @switches << switch if yield(switch.payload)
    end
  else
    @switches = Switch.all.values_at(*nums)
  end

  find_all_possibilities!
end

Instance Attribute Details

#possibilities ⇒ Object

Returns the value of attribute possibilities.



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# File 'lib/whatnot/switch_group.rb', line 2

def possibilities
  @possibilities
end

#switches ⇒ Object

Returns the value of attribute switches.



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# File 'lib/whatnot/switch_group.rb', line 2

def switches
  @switches
end

Instance Method Details

#dimacs ⇒ Object 



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# File 'lib/whatnot/switch_group.rb', line 124

def dimacs
  r = ""

  r << "c Switches:\n"
  @switches.each do |switch|
    switch_pp = switch.payload.pretty_inspect.lines
    r << "c   #{switch.number}: #{switch_pp[0]}"
    switch_pp[1..-1].each do |line|
      r << "c     #{line}"
    end
  end

  if @min_on > 0
    @switches.combination(@switches.size - (@min_on-1)).each do |combo|
      r << combo.map(&:number).map(&:to_s).join(" ") + " 0\n"
    end
  end

  if @max_on < @switches.size
    @switches.combination(@max_on+1).each do |combo|
      r << combo.map(&:number).map { |s| "-#{s}" }.join(" ") + " 0\n"
    end
  end

  r << "\n\n"
  r
end

#find_all_possibilities! ⇒ Object 



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# File 'lib/whatnot/switch_group.rb', line 21

def find_all_possibilities!
  switchmap = Hash[@switches.each_with_index.map { |s, ix| [s.number, ix+1] }]

  groupdimacs = dimacs.lines.map do |line|
    next if line.start_with?("c") || line.lstrip == ""

    nums = line.split(" ").map(&:to_i)

    newnums = []
    nums.each do |n|
      if n > 0
        newnums << switchmap[n]
      elsif n < 0
        newnums << switchmap[n*-1] * -1
      else
        newnums << n
      end
    end

    newnums.map(&:to_s).join(" ")
  end

  groupdimacs = groupdimacs.compact.join("\n")

  groupinterpreter = -> (str) do
    nums = str.split(" ").map(&:to_i)

    newnums = []
    nums.each do |n|
      if n > 0
        newnums << @switches[n-1].number
      elsif n == 0
        newnums << n
      else
        newnums << @switches[(-1*n)-1].number * -1
      end
    end

    solution = newnums.map(&:to_s).join(" ")

    [group_interpret(solution), solution]
  end

  if groupdimacs.empty?
    # all solutions are possible, so iterate all.
    # can't use minisat here (it won't know how many vars there are).
    possibilities = {}

    switch_combos = switches.map do |switch|
      n = switch.number
      [n, -1 * n]
    end

    switch_combos.inject(&:product).each do |product|
      product = product.is_a?(Array) ? product.flatten : [product]
      solution = product.map(&:to_s).join(" ") + " 0"
      possibilities[group_interpret(solution)] = solution
    end

    @possibilities = possibilities
  else
    @possibilities = Hash[SolutionEnumerator.new(groupinterpreter, groupdimacs).entries]
  end
end

#group_interpret(solution) ⇒ Object 



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# File 'lib/whatnot/switch_group.rb', line 86

def group_interpret(solution)
  out = {}

  solution.split(" ").each do |num|
    num = num.to_i

    if num > 0
      merge_payload!(for_num: num, to_hash: out)
    end
  end

  out
end

#merge_payload!(for_num: nil, to_hash: nil) ⇒ Object 



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# File 'lib/whatnot/switch_group.rb', line 100

def merge_payload!(for_num: nil, to_hash: nil)
  if for_num.nil? || to_hash.nil?
    raise "left off required kwargs #{"for_num, " unless for_num}#{"to_hash" unless to_hash}" 
  end

  payload = Switch.find(for_num).payload
  payload_key, payload_val = *payload.to_a[0]

  # manage sets vs. slots
  if @max_on > 1
    payload_val = [payload_val] unless payload_val.is_a?(Array)

    if to_hash[payload_key]
      to_hash[payload_key] += payload_val
    else
      to_hash[payload_key] = payload_val
    end

    return to_hash
  end

  to_hash.merge!(payload)
end