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# coding: utf-8
require 'set'
require 'tag'
class Page
# Page is an abstract class.
#
# Implementors must implement several methods:
#
# def url => URI
# def title => String
# def author => Person
# def content => html | nil
# def rights => html | nil
#
# def _tags => String | Enumerable<String>
#
# def _published => DateTime | nil
# def _updated => DateTime | nil
# def _years => Enumerable<Fixnum>
def tags # => Enumerable<Tag>
if @tags.nil?
raw = _tags
if raw.is_a?(String)
raw = raw.split
end
@tags = raw.map{|tag|Tag.new(tag)}
end
@tags
end
def published # => DateTime | nil
if @published.nil?
unless _published.nil?
@published = _published
else
unless _updated.nil?
@published = _updated
end
end
# sanity check
unless _published.nil? or _updated.nil?
if _updated < _published
@published = _updated
end
end
end
@published
end
def updated # => DateTime | nil
if @updated.nil?
unless _updated.nil?
@updated = _updated
else
unless _published.nil?
@updated = _published
end
end
end
@updated
end
def years # => Enumerable<Fixnum>
if @years.nil?
if published.nil? || updated.nil?
@years = Set[]
else
first = published.year
last = updated.year
years = _years
years.add(first)
years.add(last)
@years = Set[*years.select{|i|i >= first && i <= last}]
end
end
@years
end
end
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