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require 'gitlab/markdown'
module Gitlab
module Markdown
# Issues, Snippets and Merge Requests shares similar functionality in refernce filtering.
# All this functionality moved to this class
class AbstractReferenceFilter < ReferenceFilter
include CrossProjectReference
def self.object_class
# Implement in child class
# Example: MergeRequest
end
def self.object_name
object_class.name.underscore
end
def self.object_sym
object_name.to_sym
end
def self.data_reference
"data-#{object_name.dasherize}"
end
# Public: Find references in text (like `!123` for merge requests)
#
# AnyReferenceFilter.references_in(text) do |match, object|
# "<a href=...>PREFIX#{object}</a>"
# end
#
# PREFIX - symbol that detects reference (like ! for merge requests)
# object - reference object (snippet, merget request etc)
# text - String text to search.
#
# Yields the String match, the Integer referenced object ID, and an optional String
# of the external project reference.
#
# Returns a String replaced with the return of the block.
def self.references_in(text)
text.gsub(object_class.reference_pattern) do |match|
yield match, $~[object_sym].to_i, $~[:project]
end
end
def self.referenced_by(node)
{ object_sym => LazyReference.new(object_class, node.attr(data_reference)) }
end
delegate :object_class, :object_sym, :references_in, to: :class
def find_object(project, id)
# Implement in child class
# Example: project.merge_requests.find
end
def url_for_object(object, project)
# Implement in child class
# Example: project_merge_request_url
end
def call
replace_text_nodes_matching(object_class.reference_pattern) do |content|
object_link_filter(content)
end
end
# Replace references (like `!123` for merge requests) in text with links
# to the referenced object's details page.
#
# text - String text to replace references in.
#
# Returns a String with references replaced with links. All links
# have `gfm` and `gfm-OBJECT_NAME` class names attached for styling.
def object_link_filter(text)
references_in(text) do |match, id, project_ref|
project = project_from_ref(project_ref)
if project && object = find_object(project, id)
title = escape_once("#{object_title}: #{object.title}")
klass = reference_class(object_sym)
data = data_attribute(project: project.id, object_sym => object.id)
url = url_for_object(object, project)
%(<a href="#{url}" #{data}
title="#{title}"
class="#{klass}">#{match}</a>)
else
match
end
end
end
def object_title
object_class.name.titleize
end
end
end
end
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