instiki/lib/page_renderer.rb

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Ruby
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require 'xhtmldiff'
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# Temporary class containing all rendering stuff from a Revision
# I want to shift all rendering loguc to the controller eventually
class PageRenderer
def self.setup_url_generator(url_generator)
@@url_generator = url_generator
end
def self.teardown_url_generator
@@url_generator = nil
end
attr_reader :revision
def initialize(revision = nil)
self.revision = revision
end
def revision=(r)
@revision = r
@display_content = @display_published = @wiki_words_cache = @wiki_includes_cache =
@wiki_references_cache = nil
end
def display_content(update_references = false)
@display_content ||= render(:update_references => update_references)
end
def display_content_for_export
render :mode => :export
end
def display_published
@display_published ||= render(:mode => :publish)
end
def display_diff
previous_revision = @revision.page.previous_revision(@revision)
if previous_revision
previous_content = "<div>" + WikiContent.new(previous_revision, @@url_generator).render!.to_s + "</div>"
current_content = "<div>" + display_content.to_s + "</div>"
diff_doc = REXML::Document.new
div = REXML::Element.new('div', nil, {:respect_whitespace =>:all})
div.attributes['class'] = 'xhtmldiff_wrapper'
diff_doc << div
hd = XHTMLDiff.new(div)
parsed_previous_revision = REXML::HashableElementDelegator.new(
REXML::XPath.first(REXML::Document.new(previous_content), '/div'))
parsed_display_content = REXML::HashableElementDelegator.new(
REXML::XPath.first(REXML::Document.new(current_content), '/div'))
Diff::LCS.traverse_balanced(parsed_previous_revision, parsed_display_content, hd)
diffs = ''
diff_doc.write(diffs, -1, true, true)
diffs.gsub(/\A<div class='xhtmldiff_wrapper'>(.*)<\/div>\Z/m, '\1')
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else
display_content
end
end
# Returns an array of all the WikiIncludes present in the content of this revision.
def wiki_includes
unless @wiki_includes_cache
chunks = display_content.find_chunks(Include)
@wiki_includes_cache = chunks.map { |c| ( c.escaped? ? nil : c.page_name ) }.compact.uniq
end
@wiki_includes_cache
end
# Returns an array of all the WikiReferences present in the content of this revision.
def wiki_references
unless @wiki_references_cache
chunks = display_content.find_chunks(WikiChunk::WikiReference)
@wiki_references_cache = chunks.map { |c| ( c.escaped? ? nil : c.page_name ) }.compact.uniq
end
@wiki_references_cache
end
# Returns an array of all the WikiWords present in the content of this revision.
def wiki_words
@wiki_words_cache ||= find_wiki_words(display_content)
end
def find_wiki_words(rendering_result)
wiki_links = rendering_result.find_chunks(WikiChunk::WikiLink)
# Exclude backslash-escaped wiki words, such as \WikiWord, as well as links to files
# and pictures, such as [[foo.txt:file]] or [[foo.jpg:pic]]
wiki_links.delete_if { |link| link.escaped? or [:pic, :file].include?(link.link_type) }
# convert to the list of unique page names
wiki_links.map { |link| ( link.page_name ) }.uniq
end
# Returns an array of all the WikiWords present in the content of this revision.
# that already exists as a page in the web.
def existing_pages
wiki_words.select { |wiki_word| @revision.page.web.page(wiki_word) }
end
# Returns an array of all the WikiWords present in the content of this revision
# that *doesn't* already exists as a page in the web.
def unexisting_pages
wiki_words - existing_pages
end
private
def render(options = {})
rendering_result = WikiContent.new(@revision, @@url_generator, options).render!
update_references(rendering_result) if options[:update_references]
rendering_result
end
def update_references(rendering_result)
WikiReference.delete_all ['page_id = ?', @revision.page_id]
references = @revision.page.wiki_references
wiki_words = find_wiki_words(rendering_result)
# TODO it may be desirable to save links to files and pictures as WikiReference objects
# present version doesn't do it
wiki_words.each do |referenced_name|
# Links to self are always considered linked
if referenced_name == @revision.page.name
link_type = WikiReference::LINKED_PAGE
else
link_type = WikiReference.link_type(@revision.page.web, referenced_name)
end
references.create :referenced_name => referenced_name, :link_type => link_type
end
include_chunks = rendering_result.find_chunks(Include)
includes = include_chunks.map { |c| ( c.escaped? ? nil : c.page_name ) }.compact.uniq
includes.each do |included_page_name|
references.create :referenced_name => included_page_name,
:link_type => WikiReference::INCLUDED_PAGE
end
categories = rendering_result.find_chunks(Category).map { |cat| cat.list }.flatten
categories.each do |category|
references.create :referenced_name => category, :link_type => WikiReference::CATEGORY
end
end
end