Class SyncEnumerator
In: lib/generator.rb
Parent: Object

SyncEnumerator creates an Enumerable object from multiple Enumerable objects and enumerates them synchronously.

Example

  require 'generator'

  s = SyncEnumerator.new([1,2,3], ['a', 'b', 'c'])

  # Yields [1, 'a'], [2, 'b'], and [3,'c']
  s.each { |row| puts row.join(', ') }

Methods

each   end?   length   new   size  

Included Modules

Enumerable

Public Class methods

new(*enums)

Creates a new SyncEnumerator which enumerates rows of given Enumerable objects.

[Source]

     # File lib/generator.rb, line 186
186:   def initialize(*enums)
187:     @gens = enums.map { |e| Generator.new(e) }
188:   end

Public Instance methods

each() {|ret| ...}

Enumerates rows of the Enumerable objects.

[Source]

     # File lib/generator.rb, line 214
214:   def each
215:     @gens.each { |g| g.rewind }
216: 
217:     loop do
218:       count = 0
219: 
220:       ret = @gens.map { |g|
221:         if g.end?
222:           count += 1
223:           nil
224:         else
225:           g.next
226:         end
227:       }
228: 
229:       if count == @gens.size
230:         break
231:       end
232: 
233:       yield ret
234:     end
235: 
236:     self
237:   end
end?(i = nil)

Returns true if the given nth Enumerable object has reached the end. If no argument is given, returns true if any of the Enumerable objects has reached the end.

[Source]

     # File lib/generator.rb, line 205
205:   def end?(i = nil)
206:     if i.nil?
207:       @gens.detect { |g| g.end? } ? true : false
208:     else
209:       @gens[i].end?
210:     end
211:   end
length()

Returns the number of enumerated Enumerable objects, i.e. the size of each row.

[Source]

     # File lib/generator.rb, line 198
198:   def length
199:     @gens.length
200:   end
size()

Returns the number of enumerated Enumerable objects, i.e. the size of each row.

[Source]

     # File lib/generator.rb, line 192
192:   def size
193:     @gens.size
194:   end

[Validate]