| import { invariant } from '../jsutils/invariant.mjs'; |
| const LineRegExp = /\r\n|[\n\r]/g; |
| /** |
| * Represents a location in a Source. |
| */ |
| |
| /** |
| * Takes a Source and a UTF-8 character offset, and returns the corresponding |
| * line and column as a SourceLocation. |
| */ |
| export function getLocation(source, position) { |
| let lastLineStart = 0; |
| let line = 1; |
| |
| for (const match of source.body.matchAll(LineRegExp)) { |
| typeof match.index === 'number' || invariant(false); |
| |
| if (match.index >= position) { |
| break; |
| } |
| |
| lastLineStart = match.index + match[0].length; |
| line += 1; |
| } |
| |
| return { |
| line, |
| column: position + 1 - lastLineStart, |
| }; |
| } |