Merge pull request #1232 from tsigo/refactor_gfm

GFM Refactoring

app/helpers/gitlab_markdown_helper.rb

@@ -12,53 +12,10 @@ module GitlabMarkdownHelper
       "{gfm-extraction-#{md5}}"
     end
 
-    # match     1    2 3               4     5            6
-    text.gsub!(/(\W)?(@([\w\._]+)|[#!$](\d+)|([\h]{6,40}))(\W)?/) do |match|
-      prefix    = $1
-      reference = $2
-      user_name = $3
-      issue_id  = $4
-      merge_request_id = $4
-      snippet_id = $4
-      commit_id = $5
-      suffix    = $6
-
     # TODO: add popups with additional information
-      ref_link = case reference
-
-                  # team member: @foo
-                  when /^@/
-                    user = @project.users.where(name: user_name).first
-                    member = @project.users_projects.where(user_id: user).first if user
-                    link_to("@#{user_name}", project_team_member_path(@project, member), html_options.merge(class: "gfm gfm-team_member #{html_options[:class]}")) if member
-
-                  # issue: #123
-                  when /^#/
-                    # avoid HTML entities
-                    unless prefix.try(:end_with?, "&") && suffix.try(:start_with?, ";")
-                      issue = @project.issues.where(id: issue_id).first
-                      link_to("##{issue_id}", project_issue_path(@project, issue), html_options.merge(title: "Issue: #{issue.title}", class: "gfm gfm-issue #{html_options[:class]}")) if issue
-                    end
-
-                  # merge request: !123
-                  when /^!/
-                    merge_request = @project.merge_requests.where(id: merge_request_id).first
-                    link_to("!#{merge_request_id}", project_merge_request_path(@project, merge_request), html_options.merge(title: "Merge Request: #{merge_request.title}", class: "gfm gfm-merge_request #{html_options[:class]}")) if merge_request
-
-                  # snippet: $123
-                  when /^\$/
-                    snippet = @project.snippets.where(id: snippet_id).first
-                    link_to("$#{snippet_id}", project_snippet_path(@project, snippet), html_options.merge(title: "Snippet: #{snippet.title}", class: "gfm gfm-snippet #{html_options[:class]}")) if snippet
-
-                  # commit: 123456...
-                  when /^\h/
-                    commit = @project.commit(commit_id)
-                    link_to(commit_id, project_commit_path(@project, id: commit.id), html_options.merge(title: "Commit: #{commit.author_name} - #{CommitDecorator.new(commit).title}", class: "gfm gfm-commit #{html_options[:class]}")) if commit
-
-                  end # case
 
-      ref_link.nil? ? match : "#{prefix}#{ref_link}#{suffix}"
-    end # gsub
+    parser = Gitlab::Markdown.new(@project, html_options)
+    text = parser.parse(text)
 
     # Insert pre block extractions
     text.gsub!(/\{gfm-extraction-(\h{32})\}/) do

lib/gitlab/markdown.rb

+module Gitlab
+  # Custom parsing for Gitlab-flavored Markdown
+  #
+  # Examples
+  #
+  #   >> m = Markdown.new(...)
+  #
+  #   >> m.parse("Hey @david, can you fix this?")
+  #   => "Hey <a href="/gitlab/team_members/1">@david</a>, can you fix this?"
+  #
+  #   >> m.parse("Commit 35d5f7c closes #1234")
+  #   => "Commit <a href="/gitlab/commits/35d5f7c">35d5f7c</a> closes <a href="/gitlab/issues/1234">#1234</a>"
+  class Markdown
+    include Rails.application.routes.url_helpers
+    include ActionView::Helpers
+
+    REFERENCE_PATTERN = %r{
+      ([^\w&;])?      # Prefix (1)
+      (               # Reference (2)
+        @([\w\._]+)   # User name (3)
+        |[#!$](\d+)   # Issue/MR/Snippet ID (4)
+        |([\h]{6,40}) # Commit ID (5)
+      )
+      ([^\w&;])?      # Suffix (6)
+    }x.freeze
+
+    attr_reader :html_options
+
+    def initialize(project, html_options = {})
+      @project      = project
+      @html_options = html_options
+    end
+
+    def parse(text)
+      text.gsub(REFERENCE_PATTERN) do |match|
+        prefix     = $1 || ''
+        reference  = $2
+        identifier = $3 || $4 || $5
+        suffix     = $6 || ''
+
+        if ref_link = reference_link(reference, identifier)
+          prefix + ref_link + suffix
+        else
+          match
+        end
+      end
+    end
+
+    private
+
+    # Private: Dispatches to a dedicated processing method based on reference
+    #
+    # reference  - Object reference ("@1234", "!567", etc.)
+    # identifier - Object identifier (Issue ID, SHA hash, etc.)
+    #
+    # Returns string rendered by the processing method
+    def reference_link(reference, identifier)
+      case reference
+      when /^@/  then reference_user(identifier)
+      when /^#/  then reference_issue(identifier)
+      when /^!/  then reference_merge_request(identifier)
+      when /^\$/ then reference_snippet(identifier)
+      when /^\h/ then reference_commit(identifier)
+      end
+    end
+
+    def reference_user(identifier)
+      if user = @project.users.where(name: identifier).first
+        member = @project.users_projects.where(user_id: user).first
+        link_to("@#{user.name}", project_team_member_path(@project, member), html_options.merge(class: "gfm gfm-team_member #{html_options[:class]}")) if member
+      end
+    end
+
+    def reference_issue(identifier)
+      if issue = @project.issues.where(id: identifier).first
+        link_to("##{issue.id}", project_issue_path(@project, issue), html_options.merge(title: "Issue: #{issue.title}", class: "gfm gfm-issue #{html_options[:class]}"))
+      end
+    end
+
+    def reference_merge_request(identifier)
+      if merge_request = @project.merge_requests.where(id: identifier).first
+        link_to("!#{merge_request.id}", project_merge_request_path(@project, merge_request), html_options.merge(title: "Merge Request: #{merge_request.title}", class: "gfm gfm-merge_request #{html_options[:class]}"))
+      end
+    end
+
+    def reference_snippet(identifier)
+      if snippet = @project.snippets.where(id: identifier).first
+        link_to("$#{snippet.id}", project_snippet_path(@project, snippet), html_options.merge(title: "Snippet: #{snippet.title}", class: "gfm gfm-snippet #{html_options[:class]}"))
+      end
+    end
+
+    def reference_commit(identifier)
+      if commit = @project.commit(identifier)
+        link_to(identifier, project_commit_path(@project, id: commit.id), html_options.merge(title: "Commit: #{commit.author_name} - #{CommitDecorator.new(commit).title}", class: "gfm gfm-commit #{html_options[:class]}"))
+      end
+    end
+  end
+end