| import { StringReader, StringWriter } from './strings'; |
| import { decodeInteger, encodeInteger, semicolon } from './vlq'; |
|
|
| export type MappingIndex = number; |
| export type RangeMappings = MappingIndex[][]; |
|
|
| export function decodeRangeMappings(input: string): RangeMappings { |
| const { length } = input; |
| const reader = new StringReader(input); |
| const rangeMappings: RangeMappings = []; |
|
|
| do { |
| const semi = reader.indexOf(';'); |
| const indices: MappingIndex[] = []; |
| let index = 0; |
|
|
| while (reader.pos < semi) { |
| index += decodeInteger(reader); |
| indices.push(index); |
| } |
|
|
| rangeMappings.push(indices); |
| reader.pos = semi + 1; |
| } while (reader.pos <= length); |
|
|
| return rangeMappings; |
| } |
|
|
| export function encodeRangeMappings(decoded: RangeMappings): string { |
| if (decoded.length === 0) return ''; |
|
|
| const writer = new StringWriter(); |
|
|
| for (let i = 0; i < decoded.length; i++) { |
| const indices = decoded[i]; |
| if (i > 0) writer.write(semicolon); |
|
|
| let index = 0; |
| for (let j = 0; j < indices.length; j++) { |
| const offset = indices[j]; |
| encodeInteger(writer, offset - index); |
| index = offset; |
| } |
| } |
|
|
| return writer.flush(); |
| } |
|
|
