Formalized GraphQLEnumType, add enumType funcion

graphql_schema/lib/src/enum.dart

@@ -1,8 +1,15 @@
 part of graphql_schema.src.schema;
 
+GraphQLEnumType enumType(String name, List<String> values,
+    {String description}) {
+  return new GraphQLEnumType(
+      name, values.map((s) => new GraphQLEnumValue(s)).toList(),
+      description: description);
+}
+
 class GraphQLEnumType extends _GraphQLStringType {
   final String name;
-  final List<String> values;
+  final List<GraphQLEnumValue> values;
   final String description;
 
   GraphQLEnumType(this.name, this.values, {this.description}) : super._();
@@ -11,7 +18,8 @@ class GraphQLEnumType extends _GraphQLStringType {
   ValidationResult<String> validate(String key, String input) {
     var result = super.validate(key, input);
 
-    if (result.successful && !values.contains(result.value)) {
+    if (result.successful &&
+        !values.map((v) => v.name).contains(result.value)) {
       return result._asFailure()
         ..errors.add(
             '"${result.value}" is not a valid value for the enum "$name".');
@@ -20,3 +28,15 @@ class GraphQLEnumType extends _GraphQLStringType {
     return result;
   }
 }
+
+class GraphQLEnumValue {
+  final String name;
+  final String deprecationReason;
+
+  GraphQLEnumValue(this.name, {this.deprecationReason});
+
+  bool get isDeprecated => deprecationReason != null;
+
+  @override
+  bool operator ==(other) => other is GraphQLEnumValue && other.name == name;
+}

graphql_schema/test/validation_test.dart

@@ -2,7 +2,7 @@ import 'package:graphql_schema/graphql_schema.dart';
 import 'package:test/test.dart';
 
 void main() {
-  var typeType = new GraphQLEnumType('Type', [
+  var typeType = enumType('Type', [
     'FIRE',
     'WATER',
     'GRASS',