module Gitlab # Custom parser for GitLab-flavored Markdown # # It replaces references in the text with links to the appropriate items in # GitLab. # # Supported reference formats are: # * @foo for team members # * #123 for issues # * !123 for merge requests # * $123 for snippets # * 123456 for commits # # It also parses Emoji codes to insert images. See # http://www.emoji-cheat-sheet.com/ for a list of the supported icons. # # Examples # # >> gfm("Hey @david, can you fix this?") # => "Hey @david, can you fix this?" # # >> gfm("Commit 35d5f7c closes #1234") # => "Commit 35d5f7c closes #1234" # # >> gfm(":trollface:") # => "\":trollface:\" module Markdown include IssuesHelper attr_reader :html_options # Public: Parse the provided text with GitLab-Flavored Markdown # # text - the source text # html_options - extra options for the reference links as given to link_to # # Note: reference links will only be generated if @project is set def gfm(text, html_options = {}) return text if text.nil? # Duplicate the string so we don't alter the original, then call to_str # to cast it back to a String instead of a SafeBuffer. This is required # for gsub calls to work as we need them to. text = text.dup.to_str @html_options = html_options # Extract pre blocks so they are not altered # from http://github.github.com/github-flavored-markdown/ text.gsub!(%r{
.*?
|.*?}m) { |match| extract_piece(match) } # Extract links with probably parsable hrefs text.gsub!(%r{.*?}m) { |match| extract_piece(match) } # Extract images with probably parsable src text.gsub!(%r{}m) { |match| extract_piece(match) } # TODO: add popups with additional information text = parse(text) # Insert pre block extractions text.gsub!(/\{gfm-extraction-(\h{32})\}/) do insert_piece($1) end sanitize text.html_safe, attributes: ActionView::Base.sanitized_allowed_attributes + %w(id class) end private def extract_piece(text) @extractions ||= {} md5 = Digest::MD5.hexdigest(text) @extractions[md5] = text "{gfm-extraction-#{md5}}" end def insert_piece(id) @extractions[id] end # Private: Parses text for references and emoji # # text - Text to parse # # Note: reference links will only be generated if @project is set # # Returns parsed text def parse(text) parse_references(text) if @project parse_emoji(text) text end REFERENCE_PATTERN = %r{ (?\W)? # Prefix ( # Reference @(?[a-zA-Z][a-zA-Z0-9_\-\.]*) # User name |\#(?\d+) # Issue ID |!(?\d+) # MR ID |\$(?\d+) # Snippet ID |(?[\h]{6,40}) # Commit ID ) (?\W)? # Suffix }x.freeze TYPES = [:user, :issue, :merge_request, :snippet, :commit].freeze def parse_references(text) # parse reference links text.gsub!(REFERENCE_PATTERN) do |match| prefix = $~[:prefix] suffix = $~[:suffix] type = TYPES.select{|t| !$~[t].nil?}.first identifier = $~[type] # Avoid HTML entities if prefix && suffix && prefix[0] == '&' && suffix[-1] == ';' match elsif ref_link = reference_link(type, identifier) "#{prefix}#{ref_link}#{suffix}" else match end end end EMOJI_PATTERN = %r{(:(\S+):)}.freeze def parse_emoji(text) # parse emoji text.gsub!(EMOJI_PATTERN) do |match| if valid_emoji?($2) image_tag(url_to_image("emoji/#{$2}.png"), class: 'emoji', title: $1, alt: $1, size: "20x20") else match end end end # Private: Checks if an emoji icon exists in the image asset directory # # emoji - Identifier of the emoji as a string (e.g., "+1", "heart") # # Returns boolean def valid_emoji?(emoji) Emoji.names.include? emoji end # Private: Dispatches to a dedicated processing method based on reference # # reference - Object reference ("@1234", "!567", etc.) # identifier - Object identifier (Issue ID, SHA hash, etc.) # # Returns string rendered by the processing method def reference_link(type, identifier) send("reference_#{type}", identifier) end def reference_user(identifier) if member = @project.users_projects.joins(:user).where(users: { username: identifier }).first link_to("@#{identifier}", project_team_member_url(@project, member), html_options.merge(class: "gfm gfm-team_member #{html_options[:class]}")) if member end end def reference_issue(identifier) if @project.issue_exists? identifier url = url_for_issue(identifier) title = title_for_issue(identifier) link_to("##{identifier}", url, html_options.merge(title: "Issue: #{title}", class: "gfm gfm-issue #{html_options[:class]}")) end end def reference_merge_request(identifier) if merge_request = @project.merge_requests.where(id: identifier).first link_to("!#{identifier}", project_merge_request_url(@project, merge_request), html_options.merge(title: "Merge Request: #{merge_request.title}", class: "gfm gfm-merge_request #{html_options[:class]}")) end end def reference_snippet(identifier) if snippet = @project.snippets.where(id: identifier).first link_to("$#{identifier}", project_snippet_url(@project, snippet), html_options.merge(title: "Snippet: #{snippet.title}", class: "gfm gfm-snippet #{html_options[:class]}")) end end def reference_commit(identifier) if @project.valid_repo? && commit = @project.repository.commit(identifier) link_to(identifier, project_commit_url(@project, commit), html_options.merge(title: CommitDecorator.new(commit).link_title, class: "gfm gfm-commit #{html_options[:class]}")) end end end end