wip

1 files changed, 83 insertions, 0 deletions

diff --git a/lib/page.rb b/lib/page.rb
new file mode 100644
index 0000000..d0b18ef
--- /dev/null
+++ b/lib/page.rb
@@ -0,0 +1,83 @@
+# 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