instiki/lib/page_renderer.rb

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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 initialize(revision)
@revision = revision
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
unless @wiki_words_cache
wiki_chunks = display_content.find_chunks(WikiChunk::WikiLink)
@wiki_words_cache = wiki_chunks.map { |c| ( c.escaped? ? nil : c.page_name ) }.compact.uniq
end
@wiki_words_cache
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
# Explicit check for new type of display cache with chunks_by_type method.
# Ensures new version works with older snapshots.
def display_content
unless @display_cache && @display_cache.respond_to?(:chunks_by_type)
@display_cache = WikiContent.new(@revision)
@display_cache.render!
end
@display_cache
end
# TODO this probably doesn't belong in revision (because it has to call back the page)
def display_diff
previous_revision = @revision.page.previous_revision(@revision)
if previous_revision
HTMLDiff.diff(PageRenderer.new(previous_revision).display_content, display_content)
else
display_content
end
end
def clear_display_cache
@wiki_words_cache = @published_cache = @display_cache = @wiki_includes_cache =
@wiki_references_cache = nil
end
def display_published
unless @published_cache && @published_cache.respond_to?(:chunks_by_type)
@published_cache = WikiContent.new(@revision, {:mode => :publish})
@published_cache.render!
end
@published_cache
end
def display_content_for_export
WikiContent.new(@revision, {:mode => :export} ).render!
end
def force_rendering
begin
display_content.render!
rescue => e
logger.error "Failed rendering page #{@name}"
logger.error e
message = e.message
# substitute content with an error message
@revision.content = <<-EOL
<p>Markup engine has failed to render this page, raising the following error:</p>
<p>#{message}</p>
<pre>#{self.content}</pre>
EOL
clear_display_cache
raise e
end
end
protected
end