Class: Fbe::Award::PTerm

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

Overview

A term for policy.

Instance Method Summary collapse

Constructor Details

#initialize(operator, operands) ⇒ PTerm

Returns a new instance of PTerm.



177
178
179
180
 
# File 'lib/fbe/award.rb', line 177

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

Instance Method Details

#publish_to(policy) ⇒ Object 



223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
 
# File 'lib/fbe/award.rb', line 223

def publish_to(policy)
  case @op
  when :award
    @operands.each do |o|
      o.publish_to(policy)
    rescue StandardError => e
      raise "Failure in #{o}: #{e.message}"
    end
  when :aka
    @operands[0..-2].each do |o|
      o.publish_to(policy)
    rescue StandardError => e
      raise "Failure in #{o}: #{e.message}"
    end
    policy.revert(@operands.size - 1)
    policy.line(to_p(@operands[@operands.size - 1]))
  when :explain
    policy.intro(to_p(@operands[0]))
  when :in
    policy.line("assume that #{to_p(@operands[0])} is #{to_p(@operands[1])}")
  when :let
    policy.line("let #{to_p(@operands[0])} be equal to #{to_p(@operands[1])}")
    policy.let(@operands[0], @operands[1])
  when :set
    policy.line("set #{to_p(@operands[0])} to #{to_p(@operands[1])}")
  when :give
    policy.line("award #{to_p(@operands[0])}")
  else
    raise "Unknown term '#{@op}'"
  end
end

#to_p(any) ⇒ Object 



255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
 
# File 'lib/fbe/award.rb', line 255

def to_p(any)
  case any
  when PTerm
    any.to_s
  when Symbol
    s = any.to_s
    subs = {
      0 => '₀',
      1 => '₁',
      2 => '₂',
      3 => '₃',
      4 => '₄',
      5 => '₅',
      6 => '₆',
      7 => '₇',
      8 => '₈',
      9 => '₉'
    }
    s.gsub!(/([a-z]+)([0-9])/) { |_| "#{Regexp.last_match[1]}#{subs[Regexp.last_match[2].to_i]}" }
    "_#{s.gsub('_', '-')}_"
  when Integer, Float
    "**#{any}**"
  else
    any
  end
end

#to_s ⇒ Object 



182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
 
# File 'lib/fbe/award.rb', line 182

def to_s
  case @op
  when :total
    'total'
  when :if
    "if #{to_p(@operands[0])} then #{to_p(@operands[1])} else #{to_p(@operands[2])}"
  when :and
    @operands.map(&:to_s).join(' and ')
  when :or
    @operands.map(&:to_s).join(' or ')
  when :not
    "not #{@operands[0]}"
  when :eq
    "#{to_p(@operands[0])} = #{to_p(@operands[1])}"
  when :lt
    "#{to_p(@operands[0])} < #{to_p(@operands[1])}"
  when :lte
    "#{to_p(@operands[0])} ≤ #{to_p(@operands[1])}"
  when :gt
    "#{to_p(@operands[0])} > #{to_p(@operands[1])}"
  when :gte
    "#{to_p(@operands[0])} ≥ #{to_p(@operands[1])}"
  when :div
    "#{to_p(@operands[0])} ÷ #{to_p(@operands[1])}"
  when :times
    "#{to_p(@operands[0])} × #{to_p(@operands[1])}"
  when :plus
    "#{to_p(@operands[0])} + #{to_p(@operands[1])}"
  when :minus
    "#{to_p(@operands[0])} - #{to_p(@operands[1])}"
  when :max
    "maximum of #{to_p(@operands[0])} and #{to_p(@operands[1])}"
  when :min
    "minimum of #{to_p(@operands[0])} and #{to_p(@operands[1])}"
  when :between
    "at least #{to_p(@operands[0])} and at most #{to_p(@operands[1])}"
  else
    raise "Unknown term '#{@op}'"
  end
end