Support for comments v2

guides/fields/introduction.md

@@ -21,7 +21,7 @@ The different elements of field definition are addressed below:
 
 - [Names](#field-names) identify the field in GraphQL
 - [Return types](#field-return-type) say what kind of data this field returns
-- [Documentation](#field-documentation) includes description and deprecation notes
+- [Documentation](#field-documentation) includes description, comments and deprecation notes
 - [Resolution behavior](#field-resolution) hooks up Ruby code to the GraphQL field
 - [Arguments](#field-arguments) allow fields to take input when they're queried
 - [Extra field metadata](#extra-field-metadata) for low-level access to the GraphQL-Ruby runtime
@@ -67,7 +67,7 @@ field :scores, [Integer, null: true] # `[Int]`, may return a list or `nil`, the
 
 ## Field Documentation
 
-Fields may be documented with a __description__ and may be __deprecated__.
+Fields may be documented with a __description__, __comment__ and may be __deprecated__.
 
 __Descriptions__ can be added with the `field(...)` method as a positional argument, a keyword argument, or inside the block:
 
@@ -85,6 +85,26 @@ field :name, String, null: false do
 end
 ```
 
+__Comments__ can be added with the `field(...)` method as a keyword argument, or inside the block:
+```ruby
+# `comment:` keyword
+field :name, String, null: false, comment: "Rename to full name"
+
+# inside the block
+field :name, String, null: false do
+  comment "Rename to full name"
+end
+```
+
+Generates field name with comment above "Rename to full name" above.
+
+```graphql
+type Foo {
+    # Rename to full name
+    name: String!
+}
+```
+
 __Deprecated__ fields can be marked by adding a `deprecation_reason:` keyword argument:
 
 ```ruby

guides/type_definitions/enums.md

@@ -59,6 +59,7 @@ end
 Each value may have:
 
 - A description (as the second argument or `description:` keyword)
+- A comment (as a `comment:` keyword)
 - A deprecation reason (as `deprecation_reason:`), marking this value as deprecated
 - A corresponding Ruby value (as `value:`), see below
 

guides/type_definitions/interfaces.md

@@ -80,6 +80,7 @@ Then, include that into each interface:
 ```ruby
 module Types::RetailItem
   include Types::BaseInterface
+  comment "TODO comment in the RetailItem interface"
   description "Something that can be bought"
   field :price, Types::Price, "How much this item costs", null: false
 

guides/type_definitions/objects.md

@@ -71,6 +71,7 @@ end
 
 # then...
 class Types::TodoList < Types::BaseObject
+  comment "Comment of the TodoList type"
   description "A list of items which may be completed"
 
   field :name, String, "The unique name of this list", null: false

guides/type_definitions/scalars.md

@@ -73,6 +73,7 @@ end
 
 # app/graphql/types/url.rb
 class Types::Url < Types::BaseScalar
+  comment "TODO comment of the scalar"
   description "A valid URL, transported as a string"
 
   def self.coerce_input(input_value, context)

guides/type_definitions/unions.md

@@ -54,6 +54,7 @@ Then, extend that one for each union in your schema:
 
 ```ruby
 class Types::CommentSubject < Types::BaseUnion
+  comment "TODO comment on the union"
   description "Objects which may be commented on"
   possible_types Types::Post, Types::Image
 

lib/graphql/language.rb

@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 require "graphql/language/block_string"
+require "graphql/language/comment"
 require "graphql/language/printer"
 require "graphql/language/sanitized_printer"
 require "graphql/language/document_from_schema_definition"

lib/graphql/language/comment.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+module GraphQL
+  module Language
+    module Comment
+      def self.print(str, indent: '')
+        lines = str.split("\n").map do |line|
+          comment_str = "".dup
+          comment_str << indent
+          comment_str << "# "
+          comment_str << line
+          comment_str.rstrip
+        end
+
+        lines.join("\n") + "\n"
+      end
+    end
+  end
+end

lib/graphql/language/document_from_schema_definition.rb

@@ -58,6 +58,7 @@ def build_object_type_node(object_type)
 
         GraphQL::Language::Nodes::ObjectTypeDefinition.new(
           name: object_type.graphql_name,
+          comment: object_type.comment,
           interfaces: ints,
           fields: build_field_nodes(@types.fields(object_type)),
           description: object_type.description,
@@ -68,6 +69,7 @@ def build_object_type_node(object_type)
       def build_field_node(field)
         GraphQL::Language::Nodes::FieldDefinition.new(
           name: field.graphql_name,
+          comment: field.comment,
           arguments: build_argument_nodes(@types.arguments(field)),
           type: build_type_name_node(field.type),
           description: field.description,
@@ -78,6 +80,7 @@ def build_field_node(field)
       def build_union_type_node(union_type)
         GraphQL::Language::Nodes::UnionTypeDefinition.new(
           name: union_type.graphql_name,
+          comment: union_type.comment,
           description: union_type.description,
           types: @types.possible_types(union_type).sort_by(&:graphql_name).map { |type| build_type_name_node(type) },
           directives: directives(union_type),
@@ -87,6 +90,7 @@ def build_union_type_node(union_type)
       def build_interface_type_node(interface_type)
         GraphQL::Language::Nodes::InterfaceTypeDefinition.new(
           name: interface_type.graphql_name,
+          comment: interface_type.comment,
           interfaces: @types.interfaces(interface_type).sort_by(&:graphql_name).map { |type| build_type_name_node(type) },
           description: interface_type.description,
           fields: build_field_nodes(@types.fields(interface_type)),
@@ -97,6 +101,7 @@ def build_interface_type_node(interface_type)
       def build_enum_type_node(enum_type)
         GraphQL::Language::Nodes::EnumTypeDefinition.new(
           name: enum_type.graphql_name,
+          comment: enum_type.comment,
           values: @types.enum_values(enum_type).sort_by(&:graphql_name).map do |enum_value|
             build_enum_value_node(enum_value)
           end,
@@ -108,6 +113,7 @@ def build_enum_type_node(enum_type)
       def build_enum_value_node(enum_value)
         GraphQL::Language::Nodes::EnumValueDefinition.new(
           name: enum_value.graphql_name,
+          comment: enum_value.comment,
           description: enum_value.description,
           directives: directives(enum_value),
         )
@@ -116,6 +122,7 @@ def build_enum_value_node(enum_value)
       def build_scalar_type_node(scalar_type)
         GraphQL::Language::Nodes::ScalarTypeDefinition.new(
           name: scalar_type.graphql_name,
+          comment: scalar_type.comment,
           description: scalar_type.description,
           directives: directives(scalar_type),
         )
@@ -130,6 +137,7 @@ def build_argument_node(argument)
 
         argument_node = GraphQL::Language::Nodes::InputValueDefinition.new(
           name: argument.graphql_name,
+          comment: argument.comment,
           description: argument.description,
           type: build_type_name_node(argument.type),
           default_value: default_value,
@@ -142,6 +150,7 @@ def build_argument_node(argument)
       def build_input_object_node(input_object)
         GraphQL::Language::Nodes::InputObjectTypeDefinition.new(
           name: input_object.graphql_name,
+          comment: input_object.comment,
           fields: build_argument_nodes(@types.arguments(input_object)),
           description: input_object.description,
           directives: directives(input_object),

lib/graphql/language/nodes.rb

@@ -270,15 +270,17 @@ def scalars
             "col: nil",
             "pos: nil",
             "filename: nil",
-            "source: nil",
+            "source: nil"
           ]
 
+          IGNORED_MARSHALLING_KEYWORDS = [:comment]
+
           def generate_initialize
             return if method_defined?(:marshal_load, false) # checking for `:initialize` doesn't work right
 
             scalar_method_names = @scalar_methods
             # TODO: These probably should be scalar methods, but `types` returns an array
-            [:types, :description].each do |extra_method|
+            [:types, :description, :comment].each do |extra_method|
               if method_defined?(extra_method)
                 scalar_method_names += [extra_method]
               end
@@ -307,6 +309,12 @@ def generate_initialize
               keywords = scalar_method_names.map { |m| "#{m}: #{m}"} +
                 children_method_names.map { |m| "#{m}: #{m}" }
 
+              ignored_keywords = IGNORED_MARSHALLING_KEYWORDS.map do |keyword|
+                "#{keyword.to_s}: nil"
+              end
+
+              marshalling_method_names = all_method_names - IGNORED_MARSHALLING_KEYWORDS
+
               module_eval <<-RUBY, __FILE__, __LINE__
                 def initialize(#{arguments.join(", ")})
                   @line = line
@@ -317,20 +325,20 @@ def initialize(#{arguments.join(", ")})
                   #{assignments.join("\n")}
                 end
 
-                def self.from_a(filename, line, col, #{all_method_names.join(", ")})
+                def self.from_a(filename, line, col, #{marshalling_method_names.join(", ")}, #{ignored_keywords.join(", ")})
                   self.new(filename: filename, line: line, col: col, #{keywords.join(", ")})
                 end
 
                 def marshal_dump
                   [
                     line, col, # use methods here to force them to be calculated
                     @filename,
-                    #{all_method_names.map { |n| "@#{n}," }.join}
+                    #{marshalling_method_names.map { |n| "@#{n}," }.join}
                   ]
                 end
 
                 def marshal_load(values)
-                  @line, @col, @filename #{all_method_names.map { |n| ", @#{n}"}.join} = values
+                  @line, @col, @filename #{marshalling_method_names.map { |n| ", @#{n}"}.join} = values
                 end
               RUBY
             end
@@ -635,7 +643,7 @@ class SchemaExtension < AbstractNode
       end
 
       class ScalarTypeDefinition < AbstractNode
-        attr_reader :description
+        attr_reader :description, :comment
         scalar_methods :name
         children_methods({
           directives: GraphQL::Language::Nodes::Directive,
@@ -652,7 +660,7 @@ class ScalarTypeExtension < AbstractNode
       end
 
       class InputValueDefinition < AbstractNode
-        attr_reader :description
+        attr_reader :description, :comment
         scalar_methods :name, :type, :default_value
         children_methods({
           directives: GraphQL::Language::Nodes::Directive,
@@ -661,7 +669,7 @@ class InputValueDefinition < AbstractNode
       end
 
       class FieldDefinition < AbstractNode
-        attr_reader :description
+        attr_reader :description, :comment
         scalar_methods :name, :type
         children_methods({
           arguments: GraphQL::Language::Nodes::InputValueDefinition,
@@ -681,7 +689,7 @@ def merge(new_options)
       end
 
       class ObjectTypeDefinition < AbstractNode
-        attr_reader :description
+        attr_reader :description, :comment
         scalar_methods :name, :interfaces
         children_methods({
           directives: GraphQL::Language::Nodes::Directive,
@@ -700,7 +708,7 @@ class ObjectTypeExtension < AbstractNode
       end
 
       class InterfaceTypeDefinition < AbstractNode
-        attr_reader :description
+        attr_reader :description, :comment
         scalar_methods :name
         children_methods({
           interfaces: GraphQL::Language::Nodes::TypeName,
@@ -721,7 +729,7 @@ class InterfaceTypeExtension < AbstractNode
       end
 
       class UnionTypeDefinition < AbstractNode
-        attr_reader :description, :types
+        attr_reader :description, :comment, :types
         scalar_methods :name
         children_methods({
           directives: GraphQL::Language::Nodes::Directive,
@@ -739,7 +747,7 @@ class UnionTypeExtension < AbstractNode
       end
 
       class EnumValueDefinition < AbstractNode
-        attr_reader :description
+        attr_reader :description, :comment
         scalar_methods :name
         children_methods({
           directives: GraphQL::Language::Nodes::Directive,
@@ -748,7 +756,7 @@ class EnumValueDefinition < AbstractNode
       end
 
       class EnumTypeDefinition < AbstractNode
-        attr_reader :description
+        attr_reader :description, :comment
         scalar_methods :name
         children_methods({
           directives: GraphQL::Language::Nodes::Directive,
@@ -767,7 +775,7 @@ class EnumTypeExtension < AbstractNode
       end
 
       class InputObjectTypeDefinition < AbstractNode
-        attr_reader :description
+        attr_reader :description, :comment
         scalar_methods :name
         children_methods({
           directives: GraphQL::Language::Nodes::Directive,