56 lines
1.4 KiB
Plaintext
56 lines
1.4 KiB
Plaintext
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow strict
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*/
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import type { ASTValidationContext } from '../ValidationContext';
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import { GraphQLError } from '../../error/GraphQLError';
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import type { ASTVisitor } from '../../language/visitor';
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export function duplicateInputFieldMessage(fieldName: string): string {
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return `There can be only one input field named "${fieldName}".`;
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}
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/**
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* Unique input field names
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*
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* A GraphQL input object value is only valid if all supplied fields are
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* uniquely named.
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*/
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export function UniqueInputFieldNames(
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context: ASTValidationContext,
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): ASTVisitor {
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const knownNameStack = [];
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let knownNames = Object.create(null);
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return {
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ObjectValue: {
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enter() {
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knownNameStack.push(knownNames);
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knownNames = Object.create(null);
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},
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leave() {
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knownNames = knownNameStack.pop();
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},
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},
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ObjectField(node) {
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const fieldName = node.name.value;
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if (knownNames[fieldName]) {
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context.reportError(
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new GraphQLError(duplicateInputFieldMessage(fieldName), [
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knownNames[fieldName],
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node.name,
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]),
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);
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} else {
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knownNames[fieldName] = node.name;
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}
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return false;
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},
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};
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}
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