Finished querying (missing interface+union types)

graphql_parser/lib/src/language/ast/selection_set.dart

@@ -1,4 +1,5 @@
 import 'package:source_span/source_span.dart';
+
 import '../token.dart';
 import 'node.dart';
 import 'selection.dart';
@@ -9,6 +10,9 @@ class SelectionSetContext extends Node {
 
   SelectionSetContext(this.LBRACE, this.RBRACE);
 
+  factory SelectionSetContext.merged(List<SelectionContext> selections) =
+      _MergedSelectionSetContext;
+
   @override
   FileSpan get span {
     var out =
@@ -16,3 +20,13 @@ class SelectionSetContext extends Node {
     return out.expand(RBRACE.span);
   }
 }
+
+class _MergedSelectionSetContext extends SelectionSetContext {
+  final List<SelectionContext> selections;
+
+  _MergedSelectionSetContext(this.selections) : super(null, null);
+
+  @override
+  FileSpan get span =>
+      selections.map((s) => s.span).reduce((a, b) => a.expand(b));
+}

graphql_schema/example/todo.dart

@@ -1,15 +1,21 @@
 import 'package:graphql_schema/graphql_schema.dart';
 
 final GraphQLSchema todoSchema = new GraphQLSchema(
-    query: objectType('Todo', [
-  field('text', type: graphQLString.nonNullable()),
-  field('created_at', type: graphQLDate)
-]));
+  query: objectType('Todo', [
+    field(
+      'text',
+      innerType: graphQLString.nonNullable(),
+    ),
+    field('created_at', innerType: graphQLDate),
+  ]),
+);
 
 main() {
   // Validation
-  var validation = todoSchema.query
-      .validate('@root', {'foo': 'bar', 'text': null, 'created_at': 24});
+  var validation = todoSchema.query.validate(
+    '@root',
+    {'foo': 'bar', 'text': null, 'created_at': 24,},
+  );
 
   if (validation.successful) {
     print('This is valid data!!!');

graphql_schema/lib/src/gen.dart

@@ -5,9 +5,10 @@ GraphQLObjectType objectType(String name,
     new GraphQLObjectType(name)..fields.addAll(fields ?? []);
 
 GraphQLField<T, Serialized> field<T, Serialized>(String name,
-    {GraphQLFieldArgument<T, Serialized> argument,
+    {Iterable<GraphQLFieldArgument<T, Serialized>> arguments:
+        const <GraphQLFieldArgument<T, Serialized>>[],
     GraphQLFieldResolver<T, Serialized> resolve,
-    GraphQLType<T, Serialized> type}) {
+    GraphQLType<T, Serialized> innerType}) {
   return new GraphQLField(name,
-      argument: argument, resolve: resolve, type: type);
+      arguments: arguments, resolve: resolve, type: innerType);
 }

graphql_schema/lib/src/type.dart

@@ -5,8 +5,6 @@ abstract class GraphQLType<Value, Serialized> {
   Value deserialize(Serialized serialized);
   ValidationResult<Serialized> validate(String key, Serialized input);
   GraphQLType<Value, Serialized> nonNullable();
-
-  bool get isNullable => false;
 }
 
 /// Shorthand to create a [GraphQLListType].
@@ -17,8 +15,8 @@ GraphQLListType<Value, Serialized> listType<Value, Serialized>(
 class GraphQLListType<Value, Serialized>
     extends GraphQLType<List<Value>, List<Serialized>>
     with _NonNullableMixin<List<Value>, List<Serialized>> {
-  final GraphQLType<Value, Serialized> type;
-  GraphQLListType(this.type);
+  final GraphQLType<Value, Serialized> innerType;
+  GraphQLListType(this.innerType);
 
   @override
   ValidationResult<List<Serialized>> validate(
@@ -32,7 +30,7 @@ class GraphQLListType<Value, Serialized>
     for (int i = 0; i < input.length; i++) {
       var k = '"$key" at index $i';
       var v = input[i];
-      var result = type.validate(k, v);
+      var result = innerType.validate(k, v);
       if (!result.successful)
         errors.addAll(result.errors);
       else
@@ -45,12 +43,12 @@ class GraphQLListType<Value, Serialized>
 
   @override
   List<Value> deserialize(List<Serialized> serialized) {
-    return serialized.map<Value>(type.deserialize).toList();
+    return serialized.map<Value>(innerType.deserialize).toList();
   }
 
   @override
   List<Serialized> serialize(List<Value> value) {
-    return value.map<Serialized>(type.serialize).toList();
+    return value.map<Serialized>(innerType.serialize).toList();
   }
 }
 
@@ -58,16 +56,13 @@ abstract class _NonNullableMixin<Value, Serialized>
     implements GraphQLType<Value, Serialized> {
   GraphQLType<Value, Serialized> _nonNullableCache;
   GraphQLType<Value, Serialized> nonNullable() => _nonNullableCache ??=
-      new _GraphQLNonNullableType<Value, Serialized>._(this);
+      new GraphQLNonNullableType<Value, Serialized>._(this);
 }
 
-class _GraphQLNonNullableType<Value, Serialized>
+class GraphQLNonNullableType<Value, Serialized>
     extends GraphQLType<Value, Serialized> {
-  final GraphQLType<Value, Serialized> type;
-  _GraphQLNonNullableType._(this.type);
-
-  @override
-  bool get isNullable => true;
+  final GraphQLType<Value, Serialized> innerType;
+  GraphQLNonNullableType._(this.innerType);
 
   @override
   GraphQLType<Value, Serialized> nonNullable() {
@@ -80,16 +75,16 @@ class _GraphQLNonNullableType<Value, Serialized>
     if (input == null)
       return new ValidationResult._failure(
           ['Expected "$key" to be a non-null value.']);
-    return type.validate(key, input);
+    return innerType.validate(key, input);
   }
 
   @override
   Value deserialize(Serialized serialized) {
-    return type.deserialize(serialized);
+    return innerType.deserialize(serialized);
   }
 
   @override
   Serialized serialize(Value value) {
-    return type.serialize(value);
+    return innerType.serialize(value);
   }
 }

graphql_schema/test/common.dart

@@ -1,14 +1,14 @@
 import 'package:graphql_schema/graphql_schema.dart';
 
 final GraphQLObjectType pokemonType = objectType('Pokemon', [
-  field('species', type: graphQLString),
-  field('catch_date', type: graphQLDate)
+  field('species', innerType: graphQLString),
+  field('catch_date', innerType: graphQLDate)
 ]);
 
 final GraphQLObjectType trainerType =
-    objectType('Trainer', [field('name', type: graphQLString)]);
+    objectType('Trainer', [field('name', innerType: graphQLString)]);
 
 final GraphQLObjectType pokemonRegionType = objectType('PokemonRegion', [
-  field('trainer', type: trainerType),
-  field('pokemon_species', type: listType(pokemonType))
+  field('trainer', innerType: trainerType),
+  field('pokemon_species', innerType: listType(pokemonType))
 ]);

graphql_server/lib/graphql.dart

@@ -44,7 +44,7 @@ class GraphQL {
     }
   }
 
-  Future<GraphQLResult> executeRequest(
+  Future<Map<String, dynamic>> executeRequest(
       GraphQLSchema schema, DocumentContext document, String operationName,
       {Map<String, dynamic> variableValues: const {}, initialValue}) async {
     var operation = getOperation(document, operationName);
@@ -53,9 +53,11 @@ class GraphQL {
     if (operation.isQuery)
       return await executeQuery(
           document, operation, schema, coercedVariableValues, initialValue);
-    else
-      return executeMutation(
-          document, operation, schema, coercedVariableValues, initialValue);
+    else {
+      throw new UnimplementedError('mutations');
+//      return executeMutation(
+//          document, operation, schema, coercedVariableValues, initialValue);
+    }
   }
 
   OperationDefinitionContext getOperation(
@@ -110,7 +112,7 @@ class GraphQL {
     return coercedValues;
   }
 
-  Future<GraphQLResult> executeQuery(
+  Future<Map<String, dynamic>> executeQuery(
       DocumentContext document,
       OperationDefinitionContext query,
       GraphQLSchema schema,
@@ -140,8 +142,8 @@ class GraphQL {
         var fieldType =
             objectType.fields.firstWhere((f) => f.name == fieldName)?.type;
         if (fieldType == null) continue;
-        var responseValue = await executeField(
-            objectType, objectValue, fields, fieldType, variableValues);
+        var responseValue = await executeField(document, fieldName, objectType,
+            objectValue, fields, fieldType, variableValues);
         resultMap[responseKey] = responseValue;
       }
     }
@@ -150,6 +152,8 @@ class GraphQL {
   }
 
   executeField(
+      DocumentContext document,
+      String fieldName,
       GraphQLObjectType objectType,
       objectValue,
       List<SelectionContext> fields,
@@ -160,7 +164,8 @@ class GraphQL {
         coerceArgumentValues(objectType, field, variableValues);
     var resolvedValue = await resolveFieldValue(
         objectType, objectValue, field.field.fieldName.name, argumentValues);
-    return completeValue(fieldType, fields, resolvedValue, variableValues);
+    return completeValue(
+        document, fieldName, fieldType, fields, resolvedValue, variableValues);
   }
 
   Map<String, dynamic> coerceArgumentValues(GraphQLObjectType objectType,
@@ -186,14 +191,14 @@ class GraphQL {
           coercedValues[argumentName] = variableValue;
         } else if (defaultValue != null || argumentDefinition.defaultsToNull) {
           coercedValues[argumentName] = defaultValue;
-        } else if (!argumentType.isNullable) {
+        } else if (argumentType is GraphQLNonNullableType) {
           throw new GraphQLException(
               'Missing value for argument "$argumentName".');
         }
       } else {
         if (defaultValue != null || argumentDefinition.defaultsToNull) {
           coercedValues[argumentName] = defaultValue;
-        } else if (!argumentType.isNullable) {
+        } else if (argumentType is GraphQLNonNullableType) {
           throw new GraphQLException(
               'Missing value for argument "$argumentName".');
         }
@@ -209,6 +214,64 @@ class GraphQL {
     return await field.resolve(objectValue, argumentValues) as T;
   }
 
+  Future completeValue(
+      DocumentContext document,
+      String fieldName,
+      GraphQLType fieldType,
+      List<SelectionContext> fields,
+      result,
+      Map<String, dynamic> variableValues) async {
+    if (fieldType is GraphQLNonNullableType) {
+      var innerType = fieldType.innerType;
+      var completedResult = completeValue(
+          document, fieldName, innerType, fields, result, variableValues);
+
+      if (completedResult == null) {
+        throw new GraphQLException(
+            'Null value provided for non-nullable field "$fieldName".');
+      } else {
+        return completedResult;
+      }
+    }
+
+    if (result == null) {
+      return null;
+    }
+
+    if (fieldType is GraphQLListType) {
+      if (result is! Iterable) {
+        throw new GraphQLException(
+            'Value of field "$fieldName" must be a list or iterable.');
+      }
+
+      var innerType = fieldType.innerType;
+      return (result as Iterable)
+          .map((resultItem) => completeValue(document, '(item in "$fieldName")',
+              innerType, fields, resultItem, variableValues))
+          .toList();
+    }
+
+    if (fieldType is GraphQLScalarType) {
+      var validation = fieldType.validate(fieldName, result);
+
+      if (!validation.successful) {
+        return null;
+      } else {
+        return validation.value;
+      }
+    }
+
+    if (fieldType is GraphQLObjectType) {
+      var objectType = fieldType;
+      var subSelectionSet = new SelectionSetContext.merged(fields);
+      return await executeSelectionSet(
+          document, subSelectionSet, objectType, result, variableValues);
+    }
+
+    // TODO: Interface/union type
+    throw new UnsupportedError('Unsupported type: $fieldType');
+  }
+
   Map<String, List<SelectionContext>> collectFields(
       DocumentContext document,
       GraphQLObjectType objectType,