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require 'html/pipeline'
module Gitlab
module Markdown
# HTML filter that replaces label references with links. References within
# <pre>, <code>, <a>, and <style> elements are ignored.
#
# Context options:
# :project (required) - Current project.
# :reference_class - Custom CSS class added to reference links.
# :only_path - Generate path-only links.
#
class LabelReferenceFilter < HTML::Pipeline::Filter
# Public: Find label references in text
#
# LabelReferenceFilter.references_in(text) do |match, label|
# "<a href=...>#{label}</a>"
# end
#
# text - String text to search.
#
# Yields the String match and the Integer label ID.
#
# Returns a String replaced with the return of the block.
def self.references_in(text)
text.gsub(LABEL_PATTERN) do |match|
yield match, $~[:label].to_i
end
end
# Pattern used to extract label references from text
#
# This pattern supports cross-project references.
LABEL_PATTERN = /~(?<label>\d+)/
# Don't look for references in text nodes that are children of these
# elements.
IGNORE_PARENTS = %w(pre code a style).to_set
def call
doc.search('text()').each do |node|
content = node.to_html
next if project.nil?
next unless content.match(LABEL_PATTERN)
next if has_ancestor?(node, IGNORE_PARENTS)
html = label_link_filter(content)
next if html == content
node.replace(html)
end
doc
end
def validate
needs :project
end
# Replace label references in text with links to the label specified.
#
# text - String text to replace references in.
#
# Returns a String with label references replaced with links. All links
# have `gfm` and `gfm-label` class names attached for styling.
def label_link_filter(text)
project = context[:project]
self.class.references_in(text) do |match, id|
if label = project.labels.find_by(id: id)
url = url_for_label(project, label)
klass = "gfm gfm-label #{context[:reference_class]}".strip
%(<a href="#{url}" class="#{klass}">#{render_colored_label(label)}</a>)
else
match
end
end
end
def url_for_label(project, label)
h = Rails.application.routes.url_helpers
h.namespace_project_issues_path(project.namespace, project,
label_name: label.name,
only_path: context[:only_path])
end
def render_colored_label(label)
LabelsHelper.render_colored_label(label)
end
def project
context[:project]
end
end
end
end
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