Class: Fbe::Award::BTerm

Inherits:
Object
  • Object
show all
Defined in:
lib/fbe/award.rb

Overview

A term for bill.

Instance Method Summary collapse

Constructor Details

#initialize(operator, operands) ⇒ BTerm

Returns a new instance of BTerm.



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# File 'lib/fbe/award.rb', line 53

def initialize(operator, operands)
  @op = operator
  @operands = operands
end

Instance Method Details

#bill_to(bill) ⇒ Object 



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# File 'lib/fbe/award.rb', line 62

def bill_to(bill)
  case @op
  when :award
    @operands.each do |o|
      o.bill_to(bill)
    rescue StandardError => e
      raise "Failure in #{o}: #{e.message}"
    end
  when :aka
    @operands[0..-2].each do |o|
      o.bill_to(bill)
    rescue StandardError => e
      raise "Failure in #{o}: #{e.message}"
    end
  when :let, :set
    bill.set(@operands[0], to_val(@operands[1], bill))
  when :give
    text = @operands[1]
    text = '' if text.nil?
    bill.line(to_val(@operands[0], bill), text)
  when :explain, :in
    # nothing, just ignore
  else
    raise "Unknown term '#{@op}'"
  end
end

#calc(bill) ⇒ Object 



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# File 'lib/fbe/award.rb', line 101

def calc(bill)
  case @op
  when :total
    bill.points
  when :if
    to_val(@operands[0], bill) ? to_val(@operands[1], bill) : to_val(@operands[2], bill)
  when :eq
    to_val(@operands[0], bill) == to_val(@operands[1], bill)
  when :lt
    to_val(@operands[0], bill) < to_val(@operands[1], bill)
  when :lte
    to_val(@operands[0], bill) <= to_val(@operands[1], bill)
  when :gt
    to_val(@operands[0], bill) > to_val(@operands[1], bill)
  when :gte
    to_val(@operands[0], bill) >= to_val(@operands[1], bill)
  when :div
    to_val(@operands[0], bill) / to_val(@operands[1], bill)
  when :times
    to_val(@operands[0], bill) * to_val(@operands[1], bill)
  when :plus
    to_val(@operands[0], bill) + to_val(@operands[1], bill)
  when :minus
    to_val(@operands[0], bill) - to_val(@operands[1], bill)
  when :max
    [to_val(@operands[0], bill), to_val(@operands[1], bill)].max
  when :min
    [to_val(@operands[0], bill), to_val(@operands[1], bill)].min
  when :between
    v = to_val(@operands[0], bill)
    a = to_val(@operands[1], bill)
    b = to_val(@operands[2], bill)
    v = b if v > b
    v = a if v < a
    v
  else
    raise "Unknown term '#{@op}'"
  end
end

#to_s ⇒ Object 



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# File 'lib/fbe/award.rb', line 58

def to_s
  "(#{@op} #{@operands.join(' ')})"
end

#to_val(any, bill) ⇒ Object 



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# File 'lib/fbe/award.rb', line 89

def to_val(any, bill)
  if any.is_a?(BTerm)
    any.calc(bill)
  elsif any.is_a?(Symbol)
    v = bill.vars[any]
    raise "Unknown name '#{any}' among [#{bill.vars.keys.join(', ')}]" if v.nil?
    v
  else
    any
  end
end