| // @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 }; |
| } |