feat(vanilla): add testing infrastructure and tests (NK-wjnczv)

1 files changed, 45 insertions, 0 deletions

diff --git a/vanilla/node_modules/@jridgewell/trace-mapping/src/sort.ts b/vanilla/node_modules/@jridgewell/trace-mapping/src/sort.ts
new file mode 100644
index 0000000..5d016cb
--- /dev/null
+++ b/vanilla/node_modules/@jridgewell/trace-mapping/src/sort.ts
@@ -0,0 +1,45 @@
+import { COLUMN } from './sourcemap-segment';
+
+import type { ReverseSegment, 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);
+}
+
+export function sortComparator<T extends SourceMapSegment | ReverseSegment>(a: T, b: T): number {
+  return a[COLUMN] - b[COLUMN];
+}