159 lines
4.3 KiB
Ruby
159 lines
4.3 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
module Banzai
|
|
module Filter
|
|
# HTML Filter for parsing Gollum's tags in HTML. It's only parses the
|
|
# following tags:
|
|
#
|
|
# - Link to internal pages:
|
|
#
|
|
# * [[Bug Reports]]
|
|
# * [[How to Contribute|Contributing]]
|
|
#
|
|
# - Link to external resources:
|
|
#
|
|
# * [[http://en.wikipedia.org/wiki/Git_(software)]]
|
|
# * [[Git|http://en.wikipedia.org/wiki/Git_(software)]]
|
|
#
|
|
# - Link internal images, the special attributes will be ignored:
|
|
#
|
|
# * [[images/logo.png]]
|
|
# * [[images/logo.png|alt=Logo]]
|
|
#
|
|
# - Link external images, the special attributes will be ignored:
|
|
#
|
|
# * [[http://example.com/images/logo.png]]
|
|
# * [[http://example.com/images/logo.png|alt=Logo]]
|
|
#
|
|
# Based on Gollum::Filter::Tags
|
|
#
|
|
# Note: the table of contents tag is now handled by TableOfContentsTagFilter
|
|
#
|
|
# Context options:
|
|
# :project_wiki (required) - Current project wiki.
|
|
#
|
|
class GollumTagsFilter < HTML::Pipeline::Filter
|
|
include ActionView::Helpers::TagHelper
|
|
|
|
# Pattern to match tags content that should be parsed in HTML.
|
|
#
|
|
# Gollum's tags have been made to resemble the tags of other markups,
|
|
# especially MediaWiki. The basic syntax is:
|
|
#
|
|
# [[tag]]
|
|
#
|
|
# Some tags will accept attributes which are separated by pipe
|
|
# symbols.Some attributes must precede the tag and some must follow it:
|
|
#
|
|
# [[prefix-attribute|tag]]
|
|
# [[tag|suffix-attribute]]
|
|
#
|
|
# See https://github.com/gollum/gollum/wiki
|
|
#
|
|
# Rubular: http://rubular.com/r/7dQnE5CUCH
|
|
TAGS_PATTERN = /\[\[(.+?)\]\]/.freeze
|
|
|
|
# Pattern to match allowed image extensions
|
|
ALLOWED_IMAGE_EXTENSIONS = /.+(jpg|png|gif|svg|bmp)\z/i.freeze
|
|
|
|
# Do not perform linking inside these tags.
|
|
IGNORED_ANCESTOR_TAGS = %w(pre code tt).to_set
|
|
|
|
def call
|
|
doc.search(".//text()").each do |node|
|
|
next if has_ancestor?(node, IGNORED_ANCESTOR_TAGS)
|
|
next unless node.content =~ TAGS_PATTERN
|
|
|
|
html = process_tag($1)
|
|
|
|
node.replace(html) if html && html != node.content
|
|
end
|
|
|
|
doc
|
|
end
|
|
|
|
private
|
|
|
|
# Process a single tag into its final HTML form.
|
|
#
|
|
# tag - The String tag contents (the stuff inside the double brackets).
|
|
#
|
|
# Returns the String HTML version of the tag.
|
|
def process_tag(tag)
|
|
parts = tag.split('|')
|
|
|
|
return if parts.size.zero?
|
|
|
|
process_image_tag(parts) || process_page_link_tag(parts)
|
|
end
|
|
|
|
# Attempt to process the tag as an image tag.
|
|
#
|
|
# tag - The String tag contents (the stuff inside the double brackets).
|
|
#
|
|
# Returns the String HTML if the tag is a valid image tag or nil
|
|
# if it is not.
|
|
def process_image_tag(parts)
|
|
content = parts[0].strip
|
|
|
|
return unless image?(content)
|
|
|
|
if url?(content)
|
|
path = content
|
|
elsif file = project_wiki.find_file(content)
|
|
path = ::File.join project_wiki_base_path, file.path
|
|
end
|
|
|
|
if path
|
|
content_tag(:img, nil, data: { src: path }, class: 'gfm')
|
|
end
|
|
end
|
|
|
|
def image?(path)
|
|
path =~ ALLOWED_IMAGE_EXTENSIONS
|
|
end
|
|
|
|
def url?(path)
|
|
path.start_with?(*%w(http https))
|
|
end
|
|
|
|
# Attempt to process the tag as a page link tag.
|
|
#
|
|
# tag - The String tag contents (the stuff inside the double brackets).
|
|
#
|
|
# Returns the String HTML if the tag is a valid page link tag or nil
|
|
# if it is not.
|
|
def process_page_link_tag(parts)
|
|
if parts.size == 1
|
|
reference = parts[0].strip
|
|
else
|
|
name, reference = *parts.compact.map(&:strip)
|
|
end
|
|
|
|
href =
|
|
if url?(reference)
|
|
reference
|
|
else
|
|
::File.join(project_wiki_base_path, reference)
|
|
end
|
|
|
|
content_tag(:a, name || reference, href: href, class: 'gfm')
|
|
end
|
|
|
|
def project_wiki
|
|
context[:project_wiki]
|
|
end
|
|
|
|
def project_wiki_base_path
|
|
project_wiki && project_wiki.wiki_base_path
|
|
end
|
|
|
|
# Ensure that a :project_wiki key exists in context
|
|
#
|
|
# Note that while the key might exist, its value could be nil!
|
|
def validate
|
|
needs :project_wiki
|
|
end
|
|
end
|
|
end
|
|
end
|