Class: SwitchInterpreter

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

Defined Under Namespace

Classes: NameCollisionError

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ SwitchInterpreter

Returns a new instance of SwitchInterpreter.



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# File 'lib/whatnot/switch_interpreter.rb', line 10

def initialize
  Switch.class_variable_set(:@@all, {})
  Switch.class_variable_set(:@@next_number, 1)
  @slot_groups = {}
  @set_groups  = {}
  @non_interpreted_groups = {}
end

Instance Attribute Details

#non_interpreted_groups ⇒ Object

Returns the value of attribute non_interpreted_groups.



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# File 'lib/whatnot/switch_interpreter.rb', line 8

def non_interpreted_groups
  @non_interpreted_groups
end

#set_groups ⇒ Object

Returns the value of attribute set_groups.



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# File 'lib/whatnot/switch_interpreter.rb', line 8

def set_groups
  @set_groups
end

#slot_groups ⇒ Object

Returns the value of attribute slot_groups.



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# File 'lib/whatnot/switch_interpreter.rb', line 8

def slot_groups
  @slot_groups
end

Instance Method Details

#create_constraint(*slotnames) ⇒ Object 



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# File 'lib/whatnot/switch_interpreter.rb', line 146

def create_constraint(*slotnames)
  solutions_to_try = nil

  slotnames.each do |groupname|
    group = interpreted_groups[groupname]

    if group.nil?
      group = @non_interpreted_groups[groupname]
    end

    raise "can't find group #{groupname}" if group.nil?

    # get possible solutions for each group
    group_solutions = group.possibilities

    merge_possibilities = -> (p1, p2) do
      Hash[p1.to_a.product(p2.to_a).map { |prod| [prod.map(&:first).inject(&:merge), prod.map(&:last).inject("") { |memo, d| memo + d[0..-2] } + "0"] }]
    end

    if solutions_to_try
      solutions_to_try = merge_possibilities.call(solutions_to_try, group_solutions)
    else
      solutions_to_try = group_solutions
    end
  end

  # get source of constraint in user code
  trace = Thread.current.backtrace
  interpreter_lines = []
  trace.each.with_index do |line, ix|
    if line.match(/switch_interpreter.rb/)
      interpreter_lines << ix
    end
  end
  line_of_caller = trace[interpreter_lines.max + 1].split("/").last
  failed_solution_strings = []

  solutions_to_try.each do |solution, solution_str|
    result = yield(**solution)

    if !result
      failed_solution_strings << solution_str
    end
  end

  if constraint_group = @non_interpreted_groups[line_of_caller]
    constraint_group.failed_solutions += failed_solution_strings
  else
    @non_interpreted_groups[line_of_caller] = FailedSolutionSwitchGroup.new(failed_solution_strings)
  end
end

#create_mutually_exclusive_sets(slotnames, slotvalues, allow_empty: true, require_complete: true, max_values: 2) ⇒ Object 



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# File 'lib/whatnot/switch_interpreter.rb', line 126

def create_mutually_exclusive_sets(slotnames, slotvalues, allow_empty: true, require_complete: true, max_values: 2)
  begin
    slotnames.each do |slotname|
      create_set(slotname, slotvalues, allow_empty: allow_empty, max_values: max_values)
    end
  rescue NameCollisionError
  end

  slotvalues.each do |slotvalue|
    min_on = require_complete ? 1 : 0

    mutual_exclusion = SwitchGroup.new(nil, min_on: min_on, max_on: 1) do |payload|
      k, v = *payload.to_a[0]
      slotnames.include?(k) && slotvalue == v
    end

    @non_interpreted_groups[slotvalue] = mutual_exclusion
  end
end

#create_mutually_exclusive_slots(slotnames, slotvalues, allow_empty: false) ⇒ Object 



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# File 'lib/whatnot/switch_interpreter.rb', line 108

def create_mutually_exclusive_slots(slotnames, slotvalues, allow_empty: false)
  begin
    slotnames.each do |slotname|
      create_slot(slotname, slotvalues, allow_empty: allow_empty)
    end
  rescue NameCollisionError
  end

  slotvalues.each do |slotvalue|
    mutual_exclusion = SwitchGroup.new(nil, min_on: 0, max_on: 1) do |payload|
      k, v = *payload.to_a[0]
      slotnames.include?(k) && slotvalue == v
    end

    @non_interpreted_groups[slotvalue] = mutual_exclusion
  end
end

#create_set(setname, setvalues, allow_empty: true, max_values: 2) ⇒ Object 



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# File 'lib/whatnot/switch_interpreter.rb', line 91

def create_set(setname, setvalues, allow_empty: true, max_values: 2)
  if interpreted_groups[setname]
    raise NameCollisionError.new(setname)
  end

  numbers = []

  [setname].product(setvalues).each do |name, value|
    s = Switch.new({name => value})
    numbers << s.number
  end

  min_on = allow_empty ? 0 : 1

  @set_groups[setname] = SwitchGroup.new(numbers, min_on: min_on, max_on: max_values)
end

#create_slot(slotname, slotvalues, allow_empty: true) ⇒ Object 



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# File 'lib/whatnot/switch_interpreter.rb', line 74

def create_slot(slotname, slotvalues, allow_empty: true)
  if interpreted_groups[slotname]
    raise NameCollisionError.new(slotname)
  end

  numbers = []

  [slotname].product(slotvalues).each do |name, value|
    s = Switch.new({name => value})
    numbers << s.number
  end

  min_on = allow_empty ? 0 : 1

  @slot_groups[slotname] = SwitchGroup.new(numbers, min_on: min_on, max_on: 1)
end

#dimacs ⇒ Object 



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# File 'lib/whatnot/switch_interpreter.rb', line 25

def dimacs
  d = "c SwitchInterpreter\np cnf 1 1\n"
  d << "\n"

  interpreted_groups.to_a.each do |key, group|
    d << "c ---------------------------\n"
    d << "c INTERPRETED\n"
    d << "c #{group.class} => \n"
    d << "c   #{key}\n"
    d << "c \n"
    d << group.dimacs
  end

  @non_interpreted_groups.to_a.each do |key, group|
    d << "c ---------------------------\n"
    d << "c NON-INTERPRETED\n"
    d << "c #{group.class} => \n"
    d << "c   #{key}\n"
    d << "c \n"
    d << group.dimacs
  end

  d
end

#interpret(solution) ⇒ Object 



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# File 'lib/whatnot/switch_interpreter.rb', line 198

def 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

#interpreted_groups ⇒ Object 



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# File 'lib/whatnot/switch_interpreter.rb', line 18

def interpreted_groups
  groups = {}
  groups.merge! @slot_groups
  groups.merge! @set_groups
  groups
end

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



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# File 'lib/whatnot/switch_interpreter.rb', line 50

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 @set_groups[payload_key]
    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