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module Banzai
module Filter
# Issues, Merge Requests, Snippets, Commits and Commit Ranges share
# similar functionality in reference filtering.
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, id, project_ref, matches|
# object = find_object(project_ref, id)
# "<a href=...>#{object.to_reference}</a>"
# end
#
# text - String text to search.
#
# Yields the String match, the Integer referenced object ID, an optional String
# of the external project reference, and all of the matchdata.
#
# Returns a String replaced with the return of the block.
def self.references_in(text, pattern = object_class.reference_pattern)
text.gsub(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
def object_class
self.class.object_class
end
def object_sym
self.class.object_sym
end
def references_in(*args, &block)
self.class.references_in(*args, &block)
end
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
if object_class.reference_pattern
# `#123`
replace_text_nodes_matching(object_class.reference_pattern) do |content|
object_link_filter(content, object_class.reference_pattern)
end
# `[Issue](#123)`, which is turned into
# `<a href="#123">Issue</a>`
replace_link_nodes_with_href(object_class.reference_pattern) do |link, text|
object_link_filter(link, object_class.reference_pattern, link_text: text)
end
end
if object_class.link_reference_pattern
# `http://gitlab.example.com/namespace/project/issues/123`, which is turned into
# `<a href="http://gitlab.example.com/namespace/project/issues/123">http://gitlab.example.com/namespace/project/issues/123</a>`
replace_link_nodes_with_text(object_class.link_reference_pattern) do |text|
object_link_filter(text, object_class.link_reference_pattern)
end
# `[Issue](http://gitlab.example.com/namespace/project/issues/123)`, which is turned into
# `<a href="http://gitlab.example.com/namespace/project/issues/123">Issue</a>`
replace_link_nodes_with_href(object_class.link_reference_pattern) do |link, text|
object_link_filter(link, object_class.link_reference_pattern, link_text: text)
end
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.
# pattern - Reference pattern to match against.
# link_text - Original content of the link being replaced.
#
# 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, pattern, link_text: nil)
references_in(text, pattern) do |match, id, project_ref, matches|
project = project_from_ref(project_ref)
if project && object = find_object(project, id)
title = object_link_title(object)
klass = reference_class(object_sym)
data = data_attribute(
original: link_text || match,
project: project.id,
object_sym => object.id
)
url = matches[:url] if matches.names.include?("url")
url ||= url_for_object(object, project)
text = link_text || object_link_text(object, matches)
%(<a href="#{url}" #{data}
title="#{escape_once(title)}"
class="#{klass}">#{escape_once(text)}</a>)
else
match
end
end
end
def object_link_text_extras(object, matches)
extras = []
if matches.names.include?("anchor") && matches[:anchor] && matches[:anchor] =~ /\A\#note_(\d+)\z/
extras << "comment #{$1}"
end
extras
end
def object_link_title(object)
"#{object_class.name.titleize}: #{object.title}"
end
def object_link_text(object, matches)
text = object.reference_link_text(context[:project])
extras = object_link_text_extras(object, matches)
text += " (#{extras.join(", ")})" if extras.any?
text
end
end
end
end
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