instiki/app/models/wiki_content.rb

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require 'cgi'
require 'chunks/engines'
require 'chunks/category'
require 'chunks/include'
require 'chunks/wiki'
require 'chunks/literal'
require 'chunks/uri'
require 'chunks/nowiki'
# Wiki content is just a string that can process itself with a chain of
# actions. The actions can modify wiki content so that certain parts of
# it are protected from being rendered by later actions.
#
# When wiki content is rendered, it can be interrogated to find out
# which chunks were rendered. This means things like categories, wiki
# links, can be determined.
#
# Exactly how wiki content is rendered is determined by a number of
# settings that are optionally passed in to a constructor. The current
# options are:
# * :engine
# => The structural markup engine to use (Textile, Markdown, RDoc)
# * :engine_opts
# => A list of options to pass to the markup engines (safe modes, etc)
# * :pre_engine_actions
# => A list of render actions or chunks to be processed before the
# markup engine is applied. By default this is:
# Category, Include, URIChunk, WikiChunk::Link, WikiChunk::Word
# * :post_engine_actions
# => A list of render actions or chunks to apply after the markup
# engine. By default these are:
# Literal::Pre, Literal::Tags
# * :mode
# => How should the content be rendered? For normal display (:display),
# publishing (:publish) or export (:export)?
#
# AUTHOR: Mark Reid <mark @ threewordslong . com>
# CREATED: 15th May 2004
# UPDATED: 22nd May 2004
class WikiContent < String
PRE_ENGINE_ACTIONS = [ NoWiki, Category, Include, WikiChunk::Link, URIChunk, LocalURIChunk,
WikiChunk::Word ]
POST_ENGINE_ACTIONS = [ Literal::Pre, Literal::Tags ]
DEFAULT_OPTS = {
:pre_engine_actions => PRE_ENGINE_ACTIONS,
:post_engine_actions => POST_ENGINE_ACTIONS,
:engine => Engines::Textile,
:engine_opts => [],
:mode => [:display]
}
attr_reader :web, :options, :rendered, :chunks
# Create a new wiki content string from the given one.
# The options are explained at the top of this file.
def initialize(revision, options = {})
@revision = revision
@web = @revision.page.web
# Deep copy of DEFAULT_OPTS to ensure that changes to PRE/POST_ENGINE_ACTIONS stay local
@options = Marshal.load(Marshal.dump(DEFAULT_OPTS)).update(options)
@options[:engine] = Engines::MAP[@web.markup] || Engines::Textile
@options[:engine_opts] = (@web.safe_mode ? [:filter_html, :filter_styles] : [])
@options[:pre_engine_actions].delete(WikiChunk::Word) if @web.brackets_only
super(@revision.content)
begin
render!(@options[:pre_engine_actions] + [@options[:engine]] + @options[:post_engine_actions])
# FIXME this is where all the parsing problems were shoved under the carpet
# rescue => e
# @rendered = e.message
end
end
# Call @web.page_link using current options.
def page_link(name, text, link_type)
@options[:link_type] = link_type || :show
@web.make_link(name, text, @options)
end
# Find all the chunks of the given types
def find_chunks(chunk_type)
rendered.select { |chunk| chunk.kind_of?(chunk_type) }
end
# Render this content using the specified actions.
def render!(chunk_types)
@chunks = []
chunk_types.each { |chunk_type| chunk_type.apply_to(self) }
@rendered = @chunks.map { |chunk| chunk.unmask(self) }.compact
(@chunks - @rendered).each { |chunk| chunk.revert(self) }
end
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end