Reimplement toc using Kramdown toc generator

lib/rpub/chapter.rb

@@ -17,6 +17,11 @@ def initialize(content, number, layout)
       @content, @number, @layout = content, number, layout
       @document = Kramdown::Document.new(content, KRAMDOWN_OPTIONS.merge(:template => layout))
     end
+
+    # @return [Kramdown::Element] Toc elements hierarchy
+    def toc
+      Kramdown::Converter::Toc.convert(@document.root).first
+    end
 
     # @return [String] Unique identifier for this chapter.
     def uid

lib/rpub/epub/toc.rb

@@ -16,14 +16,14 @@ def render
         xml.ncx :xmlns => 'http://www.daisy.org/z3986/2005/ncx/', :version => '2005-1' do
           xml.head do
             xml.meta :name => 'dtb:uid',            :content => book.uid
-            xml.meta :name => 'dtb:depth',          :content => '1'
+            xml.meta :name => 'dtb:depth',          :content => @max_level
             xml.meta :name => 'dtb:totalPageCount', :content => '0'
             xml.meta :name => 'dtb:maxPageNumber',  :content => '0'
           end
           xml.docTitle { xml.text book.title }
           xml.navMap do
             book.chapters.each do |chapter|
-              nav_points_nested_by_level chapter
+              nav_points_nested_by_level chapter.toc, chapter.filename
             end
           end
         end
@@ -35,13 +35,13 @@ def next_play_order
         @play_order += 1
       end
 
-      def nav_points_nested_by_level(chapter, level = 1, start = nil)
-        chapter.outline.each_with_index do |heading, i|
-          next if start && i < start
-          break unless heading.level == level
-          nav_point chapter.xml_id + '-' + heading.html_id, next_play_order, heading.text, chapter.filename + '#' + heading.html_id do
-            if level < @max_level
-              nav_points_nested_by_level chapter, level + 1, i + 1
+      def nav_points_nested_by_level(heading, filename, level = 1)
+        heading.children.each do |heading|
+          html_id = heading.attr[:id]
+          source = filename+'#'+html_id
+          nav_point html_id, next_play_order, heading.value.options[:raw_text], source do
+            if level <= @max_level
+              nav_points_nested_by_level heading, filename, level + 1
             end
           end
         end
@@ -57,4 +57,3 @@ def nav_point(id, play_order, text, filename)
     end
   end
 end
-

spec/rpub/epub/toc_spec.rb

@@ -7,7 +7,7 @@
 
   it { should have_xpath('/xmlns:ncx') }
   it { should have_xpath('/xmlns:ncx/xmlns:head/xmlns:meta[@name="dtb:uid"][@content="foo"]') }
-  it { should have_xpath('/xmlns:ncx/xmlns:head/xmlns:meta[@name="dtb:depth"][@content="1"]') }
+  it { should have_xpath('/xmlns:ncx/xmlns:head/xmlns:meta[@name="dtb:depth"][@content="2"]') }
   it { should have_xpath('/xmlns:ncx/xmlns:head/xmlns:meta[@name="dtb:totalPageCount"][@content="0"]') }
   it { should have_xpath('/xmlns:ncx/xmlns:head/xmlns:meta[@name="dtb:maxPageNumber"][@content="0"]') }
   it { should have_xpath('/xmlns:ncx/xmlns:docTitle/xmlns:text[text()="title"]') }
@@ -17,13 +17,14 @@
   end
 
   context 'with chapters' do
-    let(:heading1) { double('heading', :level => 1, :text => 'chapter title', :html_id => 'foo') }
-    let(:heading2) { double('heading', :level => 2, :text => 'chapter title 2', :html_id => 'bar') }
-    let(:chapters) { [double('chapter', :title => 'chapter title', :filename => 'filename', :xml_id => 'id', :outline => [heading1, heading2])] }
-    it { should have_xpath('/xmlns:ncx/xmlns:navMap/xmlns:navPoint[@id="id-foo"]') }
+    let(:heading1) { double('heading', :children => [heading2], :value => double('value', :options => {:raw_text => 'chapter title'  }), :attr => {:id => 'foo'}) }
+    let(:heading2) { double('heading', :children => [], :value => double('value', :options => {:raw_text => 'chapter title 2'}), :attr => {:id => 'bar'}) }
+    let(:toc)      { double('toc', :children => [heading1])}
+    let(:chapters) { [double('chapter', :title => 'chapter title', :filename => 'filename', :xml_id => 'id', :toc => toc)] }
+    it { should have_xpath('/xmlns:ncx/xmlns:navMap/xmlns:navPoint[@id="foo"]') }
     it { should have_xpath('/xmlns:ncx/xmlns:navMap/xmlns:navPoint/xmlns:navLabel/xmlns:text[text()="chapter title"]') }
     it { should have_xpath('/xmlns:ncx/xmlns:navMap/xmlns:navPoint/xmlns:content[@src="filename#foo"]') }
-    it { should have_xpath('/xmlns:ncx/xmlns:navMap/xmlns:navPoint/xmlns:navPoint[@id="id-bar"]') }
+    it { should have_xpath('/xmlns:ncx/xmlns:navMap/xmlns:navPoint/xmlns:navPoint[@id="bar"]') }
     it { should have_xpath('/xmlns:ncx/xmlns:navMap/xmlns:navPoint/xmlns:navPoint/xmlns:navLabel/xmlns:text[text()="chapter title 2"]') }
     it { should have_xpath('/xmlns:ncx/xmlns:navMap/xmlns:navPoint/xmlns:navPoint/xmlns:content[@src="filename#bar"]') }
   end