From d930eb88b671fa6e5573fe7342bcdda87501bdb7 Mon Sep 17 00:00:00 2001
From: Eugen Rochko <eugen@zeonfederated.com>
Date: Thu, 19 Sep 2019 11:09:05 +0200
Subject: Add table of contents to about page (#11885)

Move public domain blocks information to about page
---
 app/lib/toc_generator.rb | 69 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 app/lib/toc_generator.rb

(limited to 'app/lib/toc_generator.rb')

diff --git a/app/lib/toc_generator.rb b/app/lib/toc_generator.rb
new file mode 100644
index 000000000..c6e179557
--- /dev/null
+++ b/app/lib/toc_generator.rb
@@ -0,0 +1,69 @@
+# frozen_string_literal: true
+
+class TOCGenerator
+  TARGET_ELEMENTS = %w(h1 h2 h3 h4 h5 h6).freeze
+  LISTED_ELEMENTS = %w(h2 h3).freeze
+
+  class Section
+    attr_accessor :depth, :title, :children, :anchor
+
+    def initialize(depth, title, anchor)
+      @depth    = depth
+      @title    = title
+      @children = []
+      @anchor   = anchor
+    end
+
+    delegate :<<, to: :children
+  end
+
+  def initialize(source_html)
+    @source_html = source_html
+    @processed   = false
+    @target_html = ''
+    @headers     = []
+    @slugs       = Hash.new { |h, k| h[k] = 0 }
+  end
+
+  def html
+    parse_and_transform unless @processed
+    @target_html
+  end
+
+  def toc
+    parse_and_transform unless @processed
+    @headers
+  end
+
+  private
+
+  def parse_and_transform
+    return if @source_html.blank?
+
+    parsed_html = Nokogiri::HTML.fragment(@source_html)
+
+    parsed_html.traverse do |node|
+      next unless TARGET_ELEMENTS.include?(node.name)
+
+      anchor = node.text.parameterize
+      @slugs[anchor] += 1
+      anchor = "#{anchor}-#{@slugs[anchor]}" if @slugs[anchor] > 1
+
+      node['id'] = anchor
+
+      next unless LISTED_ELEMENTS.include?(node.name)
+
+      depth          = node.name[1..-1]
+      latest_section = @headers.last
+
+      if latest_section.nil? || latest_section.depth >= depth
+        @headers << Section.new(depth, node.text, anchor)
+      else
+        latest_section << Section.new(depth, node.text, anchor)
+      end
+    end
+
+    @target_html = parsed_html.to_s
+    @processed   = true
+  end
+end
-- 
cgit 


From 73a5ef03b2ea175a24c33257638f46f71d22b95a Mon Sep 17 00:00:00 2001
From: Yamagishi Kazutoshi <ykzts@desire.sh>
Date: Sat, 21 Sep 2019 00:13:45 +0900
Subject: Respect original ID with ToC (#11895)

---
 app/lib/toc_generator.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'app/lib/toc_generator.rb')

diff --git a/app/lib/toc_generator.rb b/app/lib/toc_generator.rb
index c6e179557..351675a5c 100644
--- a/app/lib/toc_generator.rb
+++ b/app/lib/toc_generator.rb
@@ -45,7 +45,7 @@ class TOCGenerator
     parsed_html.traverse do |node|
       next unless TARGET_ELEMENTS.include?(node.name)
 
-      anchor = node.text.parameterize
+      anchor = node['id'] || node.text.parameterize
       @slugs[anchor] += 1
       anchor = "#{anchor}-#{@slugs[anchor]}" if @slugs[anchor] > 1
 
-- 
cgit 


From 67bef15e53a77b6f1557fdd0efa65f3e916c20df Mon Sep 17 00:00:00 2001
From: Yamagishi Kazutoshi <ykzts@desire.sh>
Date: Tue, 24 Sep 2019 00:25:10 +0900
Subject: Add fallback section ID with ToC (#11941)

---
 app/lib/toc_generator.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'app/lib/toc_generator.rb')

diff --git a/app/lib/toc_generator.rb b/app/lib/toc_generator.rb
index 351675a5c..0c8f766ca 100644
--- a/app/lib/toc_generator.rb
+++ b/app/lib/toc_generator.rb
@@ -45,7 +45,7 @@ class TOCGenerator
     parsed_html.traverse do |node|
       next unless TARGET_ELEMENTS.include?(node.name)
 
-      anchor = node['id'] || node.text.parameterize
+      anchor = node['id'] || node.text.parameterize.presence || 'sec'
       @slugs[anchor] += 1
       anchor = "#{anchor}-#{@slugs[anchor]}" if @slugs[anchor] > 1
 
-- 
cgit