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sort.ts
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sort.ts
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import { COLUMN } from './sourcemap-segment';
import type { SourceMapSegment } from './sourcemap-segment';
export default function maybeSort(
mappings: SourceMapSegment[][],
owned: boolean,
): SourceMapSegment[][] {
const unsortedIndex = nextUnsortedSegmentLine(mappings, 0);
if (unsortedIndex === mappings.length) return mappings;
// If we own the array (meaning we parsed it from JSON), then we're free to directly mutate it. If
// not, we do not want to modify the consumer's input array.
if (!owned) mappings = mappings.slice();
for (let i = unsortedIndex; i < mappings.length; i = nextUnsortedSegmentLine(mappings, i + 1)) {
mappings[i] = sortSegments(mappings[i], owned);
}
return mappings;
}
function nextUnsortedSegmentLine(mappings: SourceMapSegment[][], start: number): number {
for (let i = start; i < mappings.length; i++) {
if (!isSorted(mappings[i])) return i;
}
return mappings.length;
}
function isSorted(line: SourceMapSegment[]): boolean {
for (let j = 1; j < line.length; j++) {
if (line[j][COLUMN] < line[j - 1][COLUMN]) {
return false;
}
}
return true;
}
function sortSegments(line: SourceMapSegment[], owned: boolean): SourceMapSegment[] {
if (!owned) line = line.slice();
return line.sort(sortComparator);
}
function sortComparator(a: SourceMapSegment, b: SourceMapSegment): number {
return a[COLUMN] - b[COLUMN];
}