5292899c9a
Updated Instiki to Rails 2.1 RC1 (aka 2.0.991).
64 lines
1.9 KiB
Ruby
64 lines
1.9 KiB
Ruby
require 'enumerator'
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module ActiveSupport #:nodoc:
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module CoreExtensions #:nodoc:
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module Array #:nodoc:
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module Grouping
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# Iterates over the array in groups of size +number+, padding any remaining
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# slots with +fill_with+ unless it is +false+.
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#
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# %w(1 2 3 4 5 6 7).in_groups_of(3) {|g| p g}
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# ["1", "2", "3"]
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# ["4", "5", "6"]
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# ["7", nil, nil]
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#
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# %w(1 2 3).in_groups_of(2, ' ') {|g| p g}
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# ["1", "2"]
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# ["3", " "]
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#
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# %w(1 2 3).in_groups_of(2, false) {|g| p g}
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# ["1", "2"]
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# ["3"]
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def in_groups_of(number, fill_with = nil, &block)
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if fill_with == false
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collection = self
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else
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# size % number gives how many extra we have;
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# subtracting from number gives how many to add;
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# modulo number ensures we don't add group of just fill.
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padding = (number - size % number) % number
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collection = dup.concat([fill_with] * padding)
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end
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if block_given?
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collection.each_slice(number, &block)
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else
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returning [] do |groups|
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collection.each_slice(number) { |group| groups << group }
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end
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end
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end
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# Divides the array into one or more subarrays based on a delimiting +value+
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# or the result of an optional block.
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#
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# [1, 2, 3, 4, 5].split(3) # => [[1, 2], [4, 5]]
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# (1..10).to_a.split { |i| i % 3 == 0 } # => [[1, 2], [4, 5], [7, 8], [10]]
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def split(value = nil, &block)
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block ||= Proc.new { |e| e == value }
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inject([[]]) do |results, element|
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if block.call(element)
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results << []
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else
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results.last << element
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end
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results
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end
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end
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end
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end
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end
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end
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