Refactor rendering

This reimplements the `SDoc::Templatable` module as an `SDoc::Renderer`
class.  An `SDoc::Renderer` is instantiated per file render, which
provides an isolated scope for each rendering.  Utilizing that
isolation, the context object (the `RDoc::CodeObject` instance) is now
stored in `@context` so that it doesn't have to be explicitly passed to
partials.

Also, as an optimization, `SDoc::Renderer` memoizes compiled ERB.

lib/rdoc/generator/template/rails/_context.rhtml

@@ -1,24 +1,24 @@
 <div id="context">
-  <% unless (description = context.description).empty? %>
+  <% unless (description = @context.description).empty? %>
     <div class="description">
       <%= description %>
     </div>
   <% end %>
 
 
   <%# File only: requires %>
-  <% unless context.requires.empty? %>
+  <% unless @context.requires.empty? %>
     <div class="content__divider">Required Files</div>
     <ul>
-      <% context.requires.each do |req| %>
+      <% @context.requires.each do |req| %>
         <li><%= full_name req.name %></li>
       <% end %>
     </ul>
   <% end %>
 
 
   <%# Module only: ancestors %>
-  <% unless context.is_a?(RDoc::TopLevel) || (ancestors = module_ancestors(context)).empty? %>
+  <% unless @context.is_a?(RDoc::TopLevel) || (ancestors = module_ancestors(@context)).empty? %>
     <div class="content__divider">Inherits From</div>
     <ul>
       <% ancestors.each do |kind, ancestor| %>
@@ -31,7 +31,7 @@
   <% end %>
 
 
-  <% sections = context.sections.select { |s| s.title }.sort_by{ |s| s.title.to_s } %>
+  <% sections = @context.sections.select { |s| s.title }.sort_by{ |s| s.title.to_s } %>
   <% unless sections.empty? then %>
     <!-- Sections -->
     <div class="content__divider">Sections</div>
@@ -42,11 +42,11 @@
     </ul>
   <% end %>
 
-  <% unless context.method_list.empty? %>
+  <% unless @context.method_list.empty? %>
     <!-- Method ref -->
     <div class="content__divider">Methods</div>
     <dl class="methods">
-      <% group_by_first_letter(context.method_list).each do |letter, methods| %>
+      <% group_by_first_letter(@context.method_list).each do |letter, methods| %>
         <dt><%= letter %></dt>
         <dd>
           <ul>
@@ -64,7 +64,7 @@
 
 
 
-  <% context.each_section do |section, constants, attributes| %>
+  <% @context.each_section do |section, constants, attributes| %>
 
     <% if section.title then %>
       <div class="content__section-title" id="<%= h section.aref %>">
@@ -117,7 +117,7 @@
 
     <!-- Methods -->
     <%
-      context.methods_by_type(section).each do |type, visibilities|
+      @context.methods_by_type(section).each do |type, visibilities|
         next if visibilities.empty?
 
         visibilities.each do |visibility, methods|
@@ -174,11 +174,11 @@
     <% end %><%# context.methods_by_type %>
   <% end %><%# context.each_section %>
 
-  <% unless context.classes_and_modules.empty? %>
+  <% unless @context.classes_and_modules.empty? %>
     <!-- Namespace -->
     <div class="content__divider">Namespace</div>
     <ul>
-      <% (context.modules.sort + context.classes.sort).each do |mod| %>
+      <% (@context.modules.sort + @context.classes.sort).each do |mod| %>
         <li>
           <span class="kind"><%= mod.type %></span>
           <%= link_to mod %>

lib/rdoc/generator/template/rails/_head.rhtml

@@ -1,4 +1,4 @@
-<%= base_tag_for_context(context) %>
+<%= base_tag_for_context(@context) %>
 
 <link rel="stylesheet" href="/css/panel.css" type="text/css" media="screen" />
 <link rel="stylesheet" href="/css/main.css" type="text/css" media="screen" />
@@ -11,13 +11,13 @@
 <script src="/js/searchdoc.js" type="text/javascript"></script>
 <meta name="data-tree-keys" content='<%= tree_keys %>'>
 
-<% if canonical = canonical_url(context) %>
+<% if canonical = canonical_url(@context) %>
 <link rel="canonical" href="<%= canonical %>" />
 <meta property="og:url" content="<%= canonical %>">
 <meta property="og:image" content="<%= canonical_url("/i/logo.svg") %>">
 <% end %>
 <meta property="og:type" content="article">
 <meta property="article:modified_time" content="<%= og_modified_time %>">
-<% if description = page_description(context.description) %>
+<% if description = page_description(@context.description) %>
 <meta name="description" property="og:description" content="<%= description %>">
 <% end %>

lib/rdoc/generator/template/rails/class.rhtml

@@ -2,28 +2,28 @@
 <html lang="en">
 <head>
     <meta charset="<%= @options.charset %>">
-    <title><%= page_title klass.full_name %></title>
+    <title><%= page_title @context.full_name %></title>
     <meta name="viewport" content="width=device-width,initial-scale=1">
-    <%= include_template '_head.rhtml', {:context => klass, :tree_keys => klass.full_name.split('::') } %>
+    <%= render "_head.rhtml", { :tree_keys => @context.full_name.split('::') } %>
 
-    <meta property="og:title" value="<%= og_title klass.full_name %>">
+    <meta property="og:title" value="<%= og_title @context.full_name %>">
 </head>
 
 <body>
     <a class="sr-only sr-only-focusable" href="#context" data-turbo="false">Skip to Content</a>
     <a class="sr-only sr-only-focusable" href="#search" data-turbo="false">Skip to Search</a>
 
-    <%= include_template '_panel.rhtml' %>
+    <%= render "_panel.rhtml" %>
 
     <main id="content">
         <hgroup class="content__title">
-          <h1><span class="kind"><%= klass.type %></span> <%= module_breadcrumbs klass %></h1>
+          <h1><span class="kind"><%= @context.type %></span> <%= module_breadcrumbs @context %></h1>
         </hgroup>
 
-        <%= include_template '_context.rhtml', {:context => klass} %>
+        <%= render "_context.rhtml" %>
 
         <div class="content__divider">Definition files</div>
-        <%= more_less_ul klass.in_files.map { |file| link_to file }, 5..9 %>
+        <%= more_less_ul @context.in_files.map { |file| link_to file }, 5..9 %>
     </main>
   </body>
 </html>

lib/rdoc/generator/template/rails/file.rhtml

@@ -2,31 +2,31 @@
 <html lang="en">
 <head>
     <meta charset="<%= @options.charset %>">
-    <title><%= page_title file.name %></title>
+    <title><%= page_title @context.name %></title>
     <meta name="viewport" content="width=device-width,initial-scale=1">
-    <%= include_template '_head.rhtml', {:context => file, :tree_keys => [] } %>
+    <%= render "_head.rhtml", { :tree_keys => [] } %>
 
-    <meta property="og:title" value="<%= og_title file.name %>">
+    <meta property="og:title" value="<%= og_title @context.name %>">
 </head>
 
 <body>
     <a class="sr-only sr-only-focusable" href="#context" data-turbo="false">Skip to Content</a>
     <a class="sr-only sr-only-focusable" href="#search" data-turbo="false">Skip to Search</a>
 
-    <%= include_template '_panel.rhtml' %>
+    <%= render "_panel.rhtml" %>
 
     <main id="content">
         <div class="content__title">
-          <%= "<h1>" if file.comment.empty? %>
-            <%= full_name file %>
-          <%= "</h1>" if file.comment.empty? %>
+          <%= "<h1>" if @context.comment.empty? %>
+            <%= full_name @context %>
+          <%= "</h1>" if @context.comment.empty? %>
         </div>
 
-        <% if source_url = github_url(file.relative_name) %>
+        <% if source_url = github_url(@context.relative_name) %>
           <p class="content__source-link"><%= link_to_external "View on GitHub", source_url %></p>
         <% end %>
 
-        <%= include_template '_context.rhtml', {:context => file} %>
+        <%= render "_context.rhtml" %>
     </main>
   </body>
 </html>

lib/rdoc/generator/template/rails/file_links.rhtml

@@ -6,7 +6,7 @@
     <meta name="viewport" content="width=device-width,initial-scale=1">
 </head>
     <body>
-    <% @files.each do |file| %>
+    <% @context.each do |file| %>
       <a href="../<%= file.path %>"><%= file.relative_name %></a>
     <% end %>
     </body>

lib/rdoc/generator/template/rails/index.rhtml

@@ -4,17 +4,17 @@
     <meta charset="<%= @options.charset %>">
     <title><%= page_title %></title>
     <meta name="viewport" content="width=device-width,initial-scale=1">
-    <%= include_template '_head.rhtml', {:context => index, tree_keys: []} %>
+    <%= render "_head.rhtml", {tree_keys: []} %>
 </head>
 
 <body>
     <a class="sr-only sr-only-focusable" href="#context" data-turbo="false">Skip to Content</a>
     <a class="sr-only sr-only-focusable" href="#search" data-turbo="false">Skip to Search</a>
 
-    <%= include_template '_panel.rhtml' %>
+    <%= render "_panel.rhtml" %>
 
     <main id="content">
-        <%= include_template '_context.rhtml', {:context => index } %>
+        <%= render "_context.rhtml" %>
     </main>
   </body>
 </html>

lib/sdoc/generator.rb

@@ -1,15 +1,14 @@
-require 'erb'
 require 'pathname'
 require 'fileutils'
 require 'json'
 
 require "rdoc"
 require_relative "rdoc_monkey_patches"
 
-require 'sdoc/templatable'
-require 'sdoc/helpers'
-require 'sdoc/search_index'
-require 'sdoc/version'
+require "sdoc/postprocessor"
+require "sdoc/renderer"
+require "sdoc/search_index"
+require "sdoc/version"
 
 class RDoc::ClassModule
   def with_documentation?
@@ -27,19 +26,13 @@ class RDoc::Generator::SDoc
 
   DESCRIPTION = 'Searchable HTML documentation'
 
-  include ERB::Util
-  include SDoc::Templatable
-  include SDoc::Helpers
-
   TREE_FILE = File.join 'panel', 'tree.js'
 
   FILE_DIR = 'files'
   CLASS_DIR = 'classes'
 
   RESOURCES_DIR = File.join('resources', '.')
 
-  attr_reader :base_dir
-
   attr_reader :options
 
   ##
@@ -81,17 +74,15 @@ def initialize(store, options)
     @options.pipe = true
 
     @original_dir = Pathname.pwd
-    @template_dir = Pathname.new(options.template_dir)
-    @base_dir = options.root
+    @template_dir = Pathname(options.template_dir)
+    @output_dir = Pathname(@options.op_dir).expand_path(options.root)
   end
 
   def generate
-    @outputdir = Pathname.new(@options.op_dir).expand_path(@base_dir)
-    FileUtils.mkdir_p @outputdir
     @files = @store.all_files.sort
     @classes = @store.all_classes_and_modules.sort
 
-    # Now actually write the output
+    FileUtils.mkdir_p(@output_dir)
     copy_resources
     generate_search_index
     generate_file_links
@@ -131,58 +122,53 @@ def debug_msg( *msg )
     $stderr.puts( *msg )
   end
 
+  def render_file(template_path, output_path, context = nil)
+    return if @options.dry_run
+
+    result = SDoc::Renderer.new(context, @options).render(template_path)
+    result = SDoc::Postprocessor.process(result)
+
+    output_path = @output_dir.join(output_path)
+    output_path.dirname.mkpath
+    output_path.write(result)
+  end
+
   ### Create index.html with frameset
   def generate_index_file
-    debug_msg "Generating index file in #{@outputdir}"
-    templatefile = @template_dir + 'index.rhtml'
-    outfile      = @outputdir + 'index.html'
-
-    render_template(templatefile, binding, outfile)
+    debug_msg "Generating index file in #{@output_dir}"
+    render_file("index.rhtml", "index.html", index)
   end
 
   ### Generate a documentation file for each class
   def generate_class_files
-    debug_msg "Generating class documentation in #{@outputdir}"
-    templatefile = @template_dir + 'class.rhtml'
-
+    debug_msg "Generating class documentation in #{@output_dir}"
     @classes.each do |klass|
-      debug_msg "  working on %s (%s)" % [ klass.full_name, klass.path ]
-      outfile     = @outputdir + klass.path
-
-      debug_msg "  rendering #{outfile}"
-      render_template(templatefile, binding, outfile)
+      debug_msg "  rendering #{klass.path}"
+      render_file("class.rhtml", klass.path, klass)
     end
   end
 
   ### Generate a documentation file for each file
   def generate_file_files
-    debug_msg "Generating file documentation in #{@outputdir}"
-    templatefile = @template_dir + 'file.rhtml'
-
+    debug_msg "Generating file documentation in #{@output_dir}"
     @files.each do |file|
-      outfile     = @outputdir + file.path
-      debug_msg "  working on %s (%s)" % [ file.full_name, outfile ]
-
-      debug_msg "  rendering #{outfile}"
-      render_template(templatefile, binding, outfile)
+      debug_msg "  rendering #{file.path}"
+      render_file("file.rhtml", file.path, file)
     end
   end
 
   ### Generate file with links for the search engine
   def generate_file_links
-    debug_msg "Generating search engine index in #{@outputdir}"
-    templatefile = @template_dir + 'file_links.rhtml'
-    outfile      = @outputdir + 'panel/file_links.html'
-
-    render_template(templatefile, binding, outfile)
+    debug_msg "Generating search engine index in #{@output_dir}"
+    render_file("file_links.rhtml", "panel/file_links.html", @files)
   end
 
   ### Create class tree structure and write it as json
   def generate_class_tree
     debug_msg "Generating class tree"
     topclasses = @classes.select {|klass| !(RDoc::ClassModule === klass.parent) }
     tree = generate_file_tree + generate_class_tree_level(topclasses)
-    file = @outputdir + TREE_FILE
+    file = @output_dir + TREE_FILE
     debug_msg "  writing class tree to %s" % file
     File.open(file, "w", 0644) do |f|
       f.write('var tree = '); f.write(tree.to_json(:max_nesting => 0))
@@ -212,7 +198,7 @@ def generate_search_index
     unless @options.dry_run
       index = SDoc::SearchIndex.generate(@store.all_classes_and_modules)
 
-      @outputdir.join("js/search-index.js").open("w") do |file|
+      @output_dir.join("js/search-index.js").open("w") do |file|
         file.write("export default ")
         JSON.dump(index, file)
         file.write(";")
@@ -223,8 +209,8 @@ def generate_search_index
   ### Copy all the resource files to output dir
   def copy_resources
     resources_path = @template_dir + RESOURCES_DIR
-    debug_msg "Copying #{resources_path}/** to #{@outputdir}/**"
-    FileUtils.cp_r resources_path.to_s, @outputdir.to_s unless @options.dry_run
+    debug_msg "Copying #{resources_path}/** to #{@output_dir}/**"
+    FileUtils.cp_r resources_path.to_s, @output_dir.to_s unless @options.dry_run
   end
 
   class FilesTree

lib/sdoc/helpers.rb

@@ -1,4 +1,8 @@
+require "erb"
+
 module SDoc::Helpers
+  include ERB::Util
+
   require_relative "helpers/git"
   include SDoc::Helpers::Git