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• buildASTSchema.js

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node_modules.graphql.utilities.buildASTSchema.js Maven / Gradle / Ivy

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.buildASTSchema = buildASTSchema;
exports.getDeprecationReason = getDeprecationReason;
exports.getDescription = getDescription;
exports.buildSchema = buildSchema;

var _invariant = require('../jsutils/invariant');

var _invariant2 = _interopRequireDefault(_invariant);

var _keyValMap = require('../jsutils/keyValMap');

var _keyValMap2 = _interopRequireDefault(_keyValMap);

var _valueFromAST = require('./valueFromAST');

var _lexer = require('../language/lexer');

var _parser = require('../language/parser');

var _values = require('../execution/values');

var _kinds = require('../language/kinds');

var Kind = _interopRequireWildcard(_kinds);

var _schema = require('../type/schema');

var _scalars = require('../type/scalars');

var _definition = require('../type/definition');

var _directives = require('../type/directives');

var _introspection = require('../type/introspection');

function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 *  Copyright (c) 2015, Facebook, Inc.
 *  All rights reserved.
 *
 *  This source code is licensed under the BSD-style license found in the
 *  LICENSE file in the root directory of this source tree. An additional grant
 *  of patent rights can be found in the PATENTS file in the same directory.
 */

function buildWrappedType(innerType, inputTypeNode) {
  if (inputTypeNode.kind === Kind.LIST_TYPE) {
    return new _definition.GraphQLList(buildWrappedType(innerType, inputTypeNode.type));
  }
  if (inputTypeNode.kind === Kind.NON_NULL_TYPE) {
    var wrappedType = buildWrappedType(innerType, inputTypeNode.type);
    !!(wrappedType instanceof _definition.GraphQLNonNull) ? (0, _invariant2.default)(0, 'No nesting nonnull.') : void 0;
    return new _definition.GraphQLNonNull(wrappedType);
  }
  return innerType;
}

function getNamedTypeNode(typeNode) {
  var namedType = typeNode;
  while (namedType.kind === Kind.LIST_TYPE || namedType.kind === Kind.NON_NULL_TYPE) {
    namedType = namedType.type;
  }
  return namedType;
}

/**
 * This takes the ast of a schema document produced by the parse function in
 * src/language/parser.js.
 *
 * If no schema definition is provided, then it will look for types named Query
 * and Mutation.
 *
 * Given that AST it constructs a GraphQLSchema. The resulting schema
 * has no resolve methods, so execution will use default resolvers.
 */
function buildASTSchema(ast) {
  if (!ast || ast.kind !== Kind.DOCUMENT) {
    throw new Error('Must provide a document ast.');
  }

  var schemaDef = void 0;

  var typeDefs = [];
  var nodeMap = Object.create(null);
  var directiveDefs = [];
  for (var i = 0; i < ast.definitions.length; i++) {
    var d = ast.definitions[i];
    switch (d.kind) {
      case Kind.SCHEMA_DEFINITION:
        if (schemaDef) {
          throw new Error('Must provide only one schema definition.');
        }
        schemaDef = d;
        break;
      case Kind.SCALAR_TYPE_DEFINITION:
      case Kind.OBJECT_TYPE_DEFINITION:
      case Kind.INTERFACE_TYPE_DEFINITION:
      case Kind.ENUM_TYPE_DEFINITION:
      case Kind.UNION_TYPE_DEFINITION:
      case Kind.INPUT_OBJECT_TYPE_DEFINITION:
        var typeName = d.name.value;
        if (nodeMap[typeName]) {
          throw new Error('Type "' + typeName + '" was defined more than once.');
        }
        typeDefs.push(d);
        nodeMap[typeName] = d;
        break;
      case Kind.DIRECTIVE_DEFINITION:
        directiveDefs.push(d);
        break;
    }
  }

  var queryTypeName = void 0;
  var mutationTypeName = void 0;
  var subscriptionTypeName = void 0;
  if (schemaDef) {
    schemaDef.operationTypes.forEach(function (operationType) {
      var typeName = operationType.type.name.value;
      if (operationType.operation === 'query') {
        if (queryTypeName) {
          throw new Error('Must provide only one query type in schema.');
        }
        if (!nodeMap[typeName]) {
          throw new Error('Specified query type "' + typeName + '" not found in document.');
        }
        queryTypeName = typeName;
      } else if (operationType.operation === 'mutation') {
        if (mutationTypeName) {
          throw new Error('Must provide only one mutation type in schema.');
        }
        if (!nodeMap[typeName]) {
          throw new Error('Specified mutation type "' + typeName + '" not found in document.');
        }
        mutationTypeName = typeName;
      } else if (operationType.operation === 'subscription') {
        if (subscriptionTypeName) {
          throw new Error('Must provide only one subscription type in schema.');
        }
        if (!nodeMap[typeName]) {
          throw new Error('Specified subscription type "' + typeName + '" not found in document.');
        }
        subscriptionTypeName = typeName;
      }
    });
  } else {
    if (nodeMap.Query) {
      queryTypeName = 'Query';
    }
    if (nodeMap.Mutation) {
      mutationTypeName = 'Mutation';
    }
    if (nodeMap.Subscription) {
      subscriptionTypeName = 'Subscription';
    }
  }

  if (!queryTypeName) {
    throw new Error('Must provide schema definition with query type or a type named Query.');
  }

  var innerTypeMap = {
    String: _scalars.GraphQLString,
    Int: _scalars.GraphQLInt,
    Float: _scalars.GraphQLFloat,
    Boolean: _scalars.GraphQLBoolean,
    ID: _scalars.GraphQLID,
    __Schema: _introspection.__Schema,
    __Directive: _introspection.__Directive,
    __DirectiveLocation: _introspection.__DirectiveLocation,
    __Type: _introspection.__Type,
    __Field: _introspection.__Field,
    __InputValue: _introspection.__InputValue,
    __EnumValue: _introspection.__EnumValue,
    __TypeKind: _introspection.__TypeKind
  };

  var types = typeDefs.map(function (def) {
    return typeDefNamed(def.name.value);
  });

  var directives = directiveDefs.map(getDirective);

  // If specified directives were not explicitly declared, add them.
  if (!directives.some(function (directive) {
    return directive.name === 'skip';
  })) {
    directives.push(_directives.GraphQLSkipDirective);
  }

  if (!directives.some(function (directive) {
    return directive.name === 'include';
  })) {
    directives.push(_directives.GraphQLIncludeDirective);
  }

  if (!directives.some(function (directive) {
    return directive.name === 'deprecated';
  })) {
    directives.push(_directives.GraphQLDeprecatedDirective);
  }

  return new _schema.GraphQLSchema({
    query: getObjectType(nodeMap[queryTypeName]),
    mutation: mutationTypeName ? getObjectType(nodeMap[mutationTypeName]) : null,
    subscription: subscriptionTypeName ? getObjectType(nodeMap[subscriptionTypeName]) : null,
    types: types,
    directives: directives,
    astNode: schemaDef
  });

  function getDirective(directiveNode) {
    return new _directives.GraphQLDirective({
      name: directiveNode.name.value,
      description: getDescription(directiveNode),
      locations: directiveNode.locations.map(function (node) {
        return node.value;
      }),
      args: directiveNode.arguments && makeInputValues(directiveNode.arguments),
      astNode: directiveNode
    });
  }

  function getObjectType(typeNode) {
    var type = typeDefNamed(typeNode.name.value);
    !(type instanceof _definition.GraphQLObjectType) ? (0, _invariant2.default)(0, 'AST must provide object type.') : void 0;
    return type;
  }

  function produceType(typeNode) {
    var typeName = getNamedTypeNode(typeNode).name.value;
    var typeDef = typeDefNamed(typeName);
    return buildWrappedType(typeDef, typeNode);
  }

  function produceInputType(typeNode) {
    return (0, _definition.assertInputType)(produceType(typeNode));
  }

  function produceOutputType(typeNode) {
    return (0, _definition.assertOutputType)(produceType(typeNode));
  }

  function produceObjectType(typeNode) {
    var type = produceType(typeNode);
    !(type instanceof _definition.GraphQLObjectType) ? (0, _invariant2.default)(0, 'Expected Object type.') : void 0;
    return type;
  }

  function produceInterfaceType(typeNode) {
    var type = produceType(typeNode);
    !(type instanceof _definition.GraphQLInterfaceType) ? (0, _invariant2.default)(0, 'Expected Interface type.') : void 0;
    return type;
  }

  function typeDefNamed(typeName) {
    if (innerTypeMap[typeName]) {
      return innerTypeMap[typeName];
    }

    if (!nodeMap[typeName]) {
      throw new Error('Type "' + typeName + '" not found in document.');
    }

    var innerTypeDef = makeSchemaDef(nodeMap[typeName]);
    if (!innerTypeDef) {
      throw new Error('Nothing constructed for "' + typeName + '".');
    }
    innerTypeMap[typeName] = innerTypeDef;
    return innerTypeDef;
  }

  function makeSchemaDef(def) {
    if (!def) {
      throw new Error('def must be defined');
    }
    switch (def.kind) {
      case Kind.OBJECT_TYPE_DEFINITION:
        return makeTypeDef(def);
      case Kind.INTERFACE_TYPE_DEFINITION:
        return makeInterfaceDef(def);
      case Kind.ENUM_TYPE_DEFINITION:
        return makeEnumDef(def);
      case Kind.UNION_TYPE_DEFINITION:
        return makeUnionDef(def);
      case Kind.SCALAR_TYPE_DEFINITION:
        return makeScalarDef(def);
      case Kind.INPUT_OBJECT_TYPE_DEFINITION:
        return makeInputObjectDef(def);
      default:
        throw new Error('Type kind "' + def.kind + '" not supported.');
    }
  }

  function makeTypeDef(def) {
    var typeName = def.name.value;
    return new _definition.GraphQLObjectType({
      name: typeName,
      description: getDescription(def),
      fields: function fields() {
        return makeFieldDefMap(def);
      },
      interfaces: function interfaces() {
        return makeImplementedInterfaces(def);
      },
      astNode: def
    });
  }

  function makeFieldDefMap(def) {
    return (0, _keyValMap2.default)(def.fields, function (field) {
      return field.name.value;
    }, function (field) {
      return {
        type: produceOutputType(field.type),
        description: getDescription(field),
        args: makeInputValues(field.arguments),
        deprecationReason: getDeprecationReason(field),
        astNode: field
      };
    });
  }

  function makeImplementedInterfaces(def) {
    return def.interfaces && def.interfaces.map(function (iface) {
      return produceInterfaceType(iface);
    });
  }

  function makeInputValues(values) {
    return (0, _keyValMap2.default)(values, function (value) {
      return value.name.value;
    }, function (value) {
      var type = produceInputType(value.type);
      return {
        type: type,
        description: getDescription(value),
        defaultValue: (0, _valueFromAST.valueFromAST)(value.defaultValue, type),
        astNode: value
      };
    });
  }

  function makeInterfaceDef(def) {
    var typeName = def.name.value;
    return new _definition.GraphQLInterfaceType({
      name: typeName,
      description: getDescription(def),
      fields: function fields() {
        return makeFieldDefMap(def);
      },
      astNode: def,
      resolveType: cannotExecuteSchema
    });
  }

  function makeEnumDef(def) {
    var enumType = new _definition.GraphQLEnumType({
      name: def.name.value,
      description: getDescription(def),
      values: (0, _keyValMap2.default)(def.values, function (enumValue) {
        return enumValue.name.value;
      }, function (enumValue) {
        return {
          description: getDescription(enumValue),
          deprecationReason: getDeprecationReason(enumValue),
          astNode: enumValue
        };
      }),
      astNode: def
    });

    return enumType;
  }

  function makeUnionDef(def) {
    return new _definition.GraphQLUnionType({
      name: def.name.value,
      description: getDescription(def),
      types: def.types.map(function (t) {
        return produceObjectType(t);
      }),
      resolveType: cannotExecuteSchema,
      astNode: def
    });
  }

  function makeScalarDef(def) {
    return new _definition.GraphQLScalarType({
      name: def.name.value,
      description: getDescription(def),
      astNode: def,
      serialize: function serialize() {
        return null;
      },
      // Note: validation calls the parse functions to determine if a
      // literal value is correct. Returning null would cause use of custom
      // scalars to always fail validation. Returning false causes them to
      // always pass validation.
      parseValue: function parseValue() {
        return false;
      },
      parseLiteral: function parseLiteral() {
        return false;
      }
    });
  }

  function makeInputObjectDef(def) {
    return new _definition.GraphQLInputObjectType({
      name: def.name.value,
      description: getDescription(def),
      fields: function fields() {
        return makeInputValues(def.fields);
      },
      astNode: def
    });
  }
}

/**
 * Given a field or enum value node, returns the string value for the
 * deprecation reason.
 */
function getDeprecationReason(node) {
  var deprecated = (0, _values.getDirectiveValues)(_directives.GraphQLDeprecatedDirective, node);
  return deprecated && deprecated.reason;
}

/**
 * Given an ast node, returns its string description based on a contiguous
 * block full-line of comments preceding it.
 */
function getDescription(node) {
  var loc = node.loc;
  if (!loc) {
    return;
  }
  var comments = [];
  var minSpaces = void 0;
  var token = loc.startToken.prev;
  while (token && token.kind === _lexer.TokenKind.COMMENT && token.next && token.prev && token.line + 1 === token.next.line && token.line !== token.prev.line) {
    var value = String(token.value);
    var spaces = leadingSpaces(value);
    if (minSpaces === undefined || spaces < minSpaces) {
      minSpaces = spaces;
    }
    comments.push(value);
    token = token.prev;
  }
  return comments.reverse().map(function (comment) {
    return comment.slice(minSpaces);
  }).join('\n');
}

/**
 * A helper function to build a GraphQLSchema directly from a source
 * document.
 */
function buildSchema(source) {
  return buildASTSchema((0, _parser.parse)(source));
}

// Count the number of spaces on the starting side of a string.
function leadingSpaces(str) {
  var i = 0;
  for (; i < str.length; i++) {
    if (str[i] !== ' ') {
      break;
    }
  }
  return i;
}

function cannotExecuteSchema() {
  throw new Error('Generated Schema cannot use Interface or Union types for execution.');
}