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 224
224:   def initialize(*enums)
225:     @gens = enums.map { |e| Generator.new(e) }
226:   end

Public Instance methods

each() {|ret| ...}

Enumerates rows of the Enumerable objects.

[Source]

     # File lib/generator.rb, line 252
252:   def each
253:     @gens.each { |g| g.rewind }
254: 
255:     loop do
256:       count = 0
257: 
258:       ret = @gens.map { |g|
259:         if g.end?
260:           count += 1
261:           nil
262:         else
263:           g.next
264:         end
265:       }
266: 
267:       if count == @gens.size
268:         break
269:       end
270: 
271:       yield ret
272:     end
273: 
274:     self
275:   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 243
243:   def end?(i = nil)
244:     if i.nil?
245:       @gens.detect { |g| g.end? } ? true : false
246:     else
247:       @gens[i].end?
248:     end
249:   end
length()

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

[Source]

     # File lib/generator.rb, line 236
236:   def length
237:     @gens.length
238:   end
size()

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

[Source]

     # File lib/generator.rb, line 230
230:   def size
231:     @gens.size
232:   end

[Validate]