@dillonkearns/elm-graphql
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Flow
/**
* 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
*/
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 };
}