107 lines
2.6 KiB
Ruby
107 lines
2.6 KiB
Ruby
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require 'banzai'
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require 'html/pipeline/filter'
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module Banzai
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module Filter
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# HTML Filter for parsing Gollum's tags in HTML.
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#
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# Based on Gollum::Filter::Tags
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#
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# Context options:
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# :project_wiki (required) - Current project wiki.
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#
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class GollumTagsFilter < HTML::Pipeline::Filter
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include ActionView::Helpers::TagHelper
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# Pattern to match tag contents.
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TAGS_PATTERN = %r{(.?)\[\[(.+?)\]\]([^\[]?)}
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def call
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search_text_nodes(doc).each do |node|
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content = node.content
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next unless content.match(TAGS_PATTERN)
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html = process_tag($2)
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node.replace(html) if html != node.content
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end
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doc
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end
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private
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# Process a single tag into its final HTML form.
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#
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# tag - The String tag contents (the stuff inside the double brackets).
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#
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# Returns the String HTML version of the tag.
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def process_tag(tag)
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if html = process_image_tag(tag)
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html
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else
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process_page_link_tag(tag)
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end
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end
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# Attempt to process the tag as an image tag.
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#
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# tag - The String tag contents (the stuff inside the double brackets).
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#
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# Returns the String HTML if the tag is a valid image tag or nil
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# if it is not.
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def process_image_tag(tag)
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parts = tag.split('|')
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return if parts.size.zero?
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name = parts[0].strip
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if file = project_wiki.find_file(name)
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path = ::File.join project_wiki_base_path, file.path
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elsif name =~ /^https?:\/\/.+(jpg|png|gif|svg|bmp)$/i
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path = name
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end
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if path
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content_tag(:img, nil, src: path)
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end
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end
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# Attempt to process the tag as a page link tag.
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#
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# tag - The String tag contents (the stuff inside the double brackets).
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#
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# Returns the String HTML if the tag is a valid page link tag or nil
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# if it is not.
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def process_page_link_tag(tag)
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parts = tag.split('|')
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return if parts.size.zero?
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if parts.size == 1
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url = parts[0].strip
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else
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name, url = *parts.compact.map(&:strip)
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end
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content_tag(:a, name || url, href: url)
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end
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def project_wiki
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context[:project_wiki]
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end
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def project_wiki_base_path
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project_wiki && project_wiki.wiki_base_path
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end
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# Ensure that a :project_wiki key exists in context
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#
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# Note that while the key might exist, its value could be nil!
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def validate
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needs :project_wiki
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end
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end
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end
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end
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