Update Godot docs to include v4.2 and fix older version scraping

Godot 4.2 was released on Nov 2023.

Since v3.5, godot upstream docs have used some new HTML layouts and file
structures. Since older versions still need to be scrapable, this
introduces another set of versioned filters for godot.

This change also makes small changes to the filters to handle the
current website markup for the previous godot doc versions.

The @gdscript and @globalscope entries can't currently be browsed, because of
an encoding mismatch between the frontend and backend; I've identified a
possible fix for that but will PR that separately.

lib/docs/filters/godot/clean_html.rb

@@ -6,12 +6,13 @@ module Docs
           at_css('h1').content = 'Godot Engine'
           at_css('.admonition.note').remove
         end
+        css('.admonition-grid').remove
 
-        css('ul[id].simple li:first-child:last-child').each do |node|
+        css('p[id]').each do |node|
           heading = Nokogiri::XML::Node.new 'h3', doc.document
-          heading['id'] = node.parent['id']
+          heading['id'] = node['id']
           heading.children = node.children
-          node.parent.before(heading).remove
+          node.before(heading).remove
         end
 
         css('h3 strong').each do |node|
@@ -20,6 +21,22 @@ module Docs
 
         css('a.reference').remove_attr('class')
 
+        # flatten gdscript+C# example blocks and add language name.
+        css('div[role="tabpanel"]').each do |node|
+          language_label = Nokogiri::XML::Node.new 'strong', doc.document
+          language_name = 'GDScript' if node.at_css('div.highlight-gdscript')
+          language_name = 'C#' if node.at_css('div.highlight-csharp')
+          language_label.content = language_name.to_s
+
+          node.before(language_label)
+          node.before(node.children).remove
+        end
+
+        css('div.sphinx-tabs [role="tablist"]').remove
+
+        # remove the remotely hosted "percent-translated" badge
+        css('a[href^="https://hosted.weblate"]').remove if root_page?
+
         doc
       end
     end

lib/docs/filters/godot/clean_html_v2.rb

@@ -4,7 +4,7 @@ module Docs
       def call
         if root_page?
           at_css('h1').content = 'Godot Engine'
-          at_css('.admonition.tip').remove
+          at_css('.admonition.caution').remove
         end
 
         css('ul[id].simple li:first-child:last-child').each do |node|

lib/docs/filters/godot/clean_html_v3.rb

@@ -0,0 +1,27 @@
+module Docs
+  class Godot
+    class CleanHtmlV3Filter < Filter
+      def call
+        if root_page?
+          at_css('h1').content = 'Godot Engine'
+          at_css('.admonition.caution').remove
+        end
+
+        css('ul[id].simple li:first-child:last-child').each do |node|
+          heading = Nokogiri::XML::Node.new 'h3', doc.document
+          heading['id'] = node.parent['id']
+          heading.children = node.children
+          node.parent.before(heading).remove
+        end
+
+        css('h3 strong').each do |node|
+          node.before(node.children).remove
+        end
+
+        css('a.reference').remove_attr('class')
+
+        doc
+      end
+    end
+  end
+end

lib/docs/filters/godot/entries.rb

@@ -11,7 +11,7 @@ module Docs
         if slug.start_with?('getting_started')
           # Getting started sections are different even between different minor
           # versions from v3 so we're programmatically generating them instead.
-          "Getting started: " + slug.split('/')[1].tr_s('_', ' ').capitalize
+          'Getting started: ' + slug.split('/')[1].tr_s('_', ' ').capitalize
         else
           name
         end
@@ -20,9 +20,10 @@ module Docs
       def additional_entries
         return [] unless slug.start_with?('classes')
 
-        css('.simple[id]').each_with_object [] do |node, entries|
+        css('p[id]').each_with_object [] do |node, entries|
           name = node.at_css('strong').content
           next if name == self.name
+
           name.prepend "#{self.name}."
           name << '()'
           entries << [name, node['id']] unless entries.any? { |entry| entry[0] == name }
@@ -32,6 +33,7 @@ module Docs
       def include_default_entry?
         return false if subpath.start_with?('getting_started') && subpath.end_with?('index.html')
         return false if subpath == 'classes/index.html'
+
         true
       end
     end

lib/docs/filters/godot/entries_v3.rb

@@ -0,0 +1,39 @@
+module Docs
+  class Godot
+    class EntriesV3Filter < Docs::EntriesFilter
+      def get_name
+        name = at_css('h1').content
+        name.remove! "\u{00B6}" # Remove the pilcrow
+        name
+      end
+
+      def get_type
+        if slug.start_with?('getting_started')
+          # Getting started sections are different even between different minor
+          # versions from v3 so we're programmatically generating them instead.
+          "Getting started: " + slug.split('/')[1].tr_s('_', ' ').capitalize
+        else
+          name
+        end
+      end
+
+      def additional_entries
+        return [] unless slug.start_with?('classes')
+
+        css('.simple[id]').each_with_object [] do |node, entries|
+          name = node.at_css('strong').content
+          next if name == self.name
+          name.prepend "#{self.name}."
+          name << '()'
+          entries << [name, node['id']] unless entries.any? { |entry| entry[0] == name }
+        end
+      end
+
+      def include_default_entry?
+        return false if subpath.start_with?('getting_started') && subpath.end_with?('index.html')
+        return false if subpath == 'classes/index.html'
+        true
+      end
+    end
+  end
+end

lib/docs/scrapers/godot.rb

@@ -5,59 +5,72 @@ module Docs
       home: 'https://godotengine.org/',
       code: 'https://github.com/godotengine/godot'
     }
+    # godot docs since 3.5 don't link everything from the index.
+    self.initial_paths = %w[
+      getting_started/introduction/index.html
+      getting_started/step_by_step/index.html
+      classes/index.html
+    ]
 
-    options[:container] = '.document .section'
-
+    options[:container] = '.document > [itemprop="articleBody"]'
     options[:download_images] = false
-    options[:only_patterns] = [/\Agetting_started\//, /\Aclasses\//]
+    options[:only_patterns] = [%r{\Agetting_started/}, %r{\Aclasses/}]
+
+    options[:attribution] = <<-HTML
+      &copy; 2014&ndash;present Juan Linietsky, Ariel Manzur and the Godot community<br>
+      Licensed under the Creative Commons Attribution Unported License v3.0.
+    HTML
 
-    options[:attribution] = ->(filter) do
-      if filter.subpath.start_with?('classes')
-         <<-HTML
-          &copy; 2014&ndash;2022 Juan Linietsky, Ariel Manzur, Godot Engine contributors<br>
-          Licensed under the MIT License.
-        HTML
-      else
-        <<-HTML
-          &copy; 2014&ndash;2022 Juan Linietsky, Ariel Manzur and the Godot community<br>
-          Licensed under the Creative Commons Attribution Unported License v3.0.
-        HTML
-      end
+    version '4.2' do
+      self.release = '4.2.2'
+      self.base_url = "https://docs.godotengine.org/en/#{self.version}/"
+      html_filters.push 'godot/entries', 'godot/clean_html', 'sphinx/clean_html'
     end
 
     version '3.5' do
-      self.release = '3.5.1'
+      self.release = '3.5.3'
       self.base_url = "https://docs.godotengine.org/en/#{self.version}/"
-      options[:container] = '.document > [itemprop="articleBody"] > section[id]'
+
+      # godot 3.5 upstream docs are formatted like godot4
       html_filters.push 'godot/entries', 'godot/clean_html', 'sphinx/clean_html'
     end
 
     version '3.4' do
       self.release = '3.4.5'
       self.base_url = "https://docs.godotengine.org/en/#{self.version}/"
+
       options[:container] = '.document > [itemprop="articleBody"] > section[id]'
-      html_filters.push 'godot/entries', 'godot/clean_html', 'sphinx/clean_html'
+      html_filters.push 'godot/entries_v3', 'godot/clean_html_v3', 'sphinx/clean_html'
     end
 
     version '3.3' do
       self.release = '3.3.0'
       self.base_url = "https://docs.godotengine.org/en/#{self.version}/"
-      html_filters.push 'godot/entries', 'godot/clean_html', 'sphinx/clean_html'
+      self.initial_paths = %w[/index.html]
+
+      options[:only_patterns] = [%r{\Aclasses/}]
+      options[:container] = '.document .section'
+      html_filters.push 'godot/entries_v3', 'godot/clean_html_v3', 'sphinx/clean_html'
     end
 
     version '3.2' do
       self.release = '3.2.3'
       self.base_url = "https://docs.godotengine.org/en/#{self.version}/"
-      html_filters.push 'godot/entries', 'godot/clean_html', 'sphinx/clean_html'
+      self.initial_paths = %w[/index.html]
+
+      options[:only_patterns] = [%r{\Aclasses/}]
+      options[:container] = '.document .section'
+      html_filters.push 'godot/entries_v3', 'godot/clean_html_v3', 'sphinx/clean_html'
     end
 
     version '2.1' do
       self.release = '2.1.6'
       self.base_url = "https://docs.godotengine.org/en/#{self.version}/"
+      self.initial_paths = %w[/index.html]
 
       options[:skip] = %w(classes/class_@global\ scope.html)
-      options[:only_patterns] = [/\Alearning\//, /\Aclasses\//]
-
+      options[:only_patterns] = [%r{\Alearning/}, %r{\Aclasses/}]
+      options[:container] = '.document .section'
       html_filters.push 'godot/entries_v2', 'godot/clean_html_v2', 'sphinx/clean_html'
     end