Share comment generation logic

templates/java/org/prism/Nodes.java.erb

@@ -175,8 +175,8 @@ public abstract class Nodes {
     <%- nodes.each do |node| -%>
 
     /**
-    <%- node.comment.each_line do |line| -%>
-     *<%= line.prepend(" ").rstrip %>
+    <%- node.each_comment_line do |line| -%>
+     *<%= line %>
     <%- end -%>
      */
     public static final class <%= node.name -%> extends Node {

templates/javascript/src/nodes.js.erb

@@ -42,8 +42,8 @@ const <%= flag.name %> = {
 <%- nodes.each do |node| -%>
 
 /**
-<%- node.comment.each_line do |line| -%>
- *<%= line.prepend(" ").rstrip %>
+<%- node.each_comment_line do |line| -%>
+ *<%= line %>
 <%- end -%>
  */
 export class <%= node.name -%> {

templates/lib/prism/node.rb.erb

@@ -32,8 +32,8 @@ module Prism
   end
   <%- nodes.each do |node| -%>
 
-  <%- node.comment.each_line do |line| -%>
-  #<%= line.prepend(" ").rstrip %>
+  <%- node.each_comment_line do |line| -%>
+  #<%= line %>
   <%- end -%>
   class <%= node.name -%> < Node
     <%- node.fields.each do |field| -%>

templates/rbi/prism.rbi.erb

@@ -1,8 +1,8 @@
 
 module Prism
   <%- nodes.each do |node| -%>
-  <%- node.comment.each_line do |line| -%>
-  #<%= line.prepend(" ").rstrip %>
+  <%- node.each_comment_line do |line| -%>
+  #<%= line %>
   <%- end -%>
   class <%= node.name -%> < Node
     <%- node.fields.each do |field| -%>

templates/sig/prism.rbs.erb

@@ -1,7 +1,7 @@
 module Prism
   <%- nodes.each do |node| -%>
-  <%- node.comment.each_line do |line| -%>
-  #<%= line.prepend(" ").rstrip %>
+  <%- node.each_comment_line do |line| -%>
+  #<%= line %>
   <%- end -%>
   class <%= node.name -%> < Node
     <%- node.fields.each do |field| -%>

templates/template.rb

@@ -255,6 +255,10 @@ def initialize(config)
       @comment = config.fetch("comment")
     end
 
+    def each_comment_line
+      comment.each_line { |line| yield line.prepend(" ").rstrip }
+    end
+
     def semantic_fields
       @semantic_fields ||= @fields.select(&:semantic_field?)
     end