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server/node_modules/graphql/language/location.js.flow

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+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict
+ */
+
+import type { Source } from './source';
+
+/**
+ * Represents a location in a Source.
+ */
+export type SourceLocation = {|
+  +line: number,
+  +column: number,
+|};
+
+/**
+ * Takes a Source and a UTF-8 character offset, and returns the corresponding
+ * line and column as a SourceLocation.
+ */
+export function getLocation(source: Source, position: number): SourceLocation {
+  const lineRegexp = /\r\n|[\n\r]/g;
+  let line = 1;
+  let column = position + 1;
+  let match;
+  while ((match = lineRegexp.exec(source.body)) && match.index < position) {
+    line += 1;
+    column = position + 1 - (match.index + match[0].length);
+  }
+  return { line, column };
+}