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Contents
class Kiss
# Enables `loop' features for certain template loops (while, for...in).
# Similar to features of Perl's Template::Iterator by Andy Wardley.
class Iterator
_attr_reader :index, :collection
# Creates a new loop iterator.
def initialize(collection = nil)
@_collection = collection
@_index = -1
end
# Return current iteration number, indexed from one instead of zero.
def count
@_index + 1
end
# Returns true if this is loop's first iteration.
def first?
@_index == 0
end
alias_method :first, :first?
# Returns true if this is the last iteration of a
# loop over a collection.
def last?
count == size
end
alias_method :last, :last?
# Return previous item in loop-iterated collection.
def prev
@_collection ? @_collection[index-1] : nil
end
# Return next item in loop-iterated collection.
def next
@_collection ? @_collection[index+1] : nil
end
# Returns index of loop's last iteration.
def max
@_collection ? @_collection.size-1 : nil
end
# Returns number of iterations in loop over a collection
# (size of the iterated collection).
def size
@_collection ? @_collection.size : nil
end
# Used by template erubis pre-processing voodoo to advance
# the iterator index. Not intended for any other use.
def increment
@_index = @_index + 1
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems