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

1 files changed, 55 insertions, 0 deletions

diff --git a/vanilla/node_modules/@jridgewell/sourcemap-codec/src/vlq.ts b/vanilla/node_modules/@jridgewell/sourcemap-codec/src/vlq.ts
new file mode 100644
index 0000000..a42c681
--- /dev/null
+++ b/vanilla/node_modules/@jridgewell/sourcemap-codec/src/vlq.ts
@@ -0,0 +1,55 @@
+import type { StringReader, StringWriter } from './strings';
+
+export const comma = ','.charCodeAt(0);
+export const semicolon = ';'.charCodeAt(0);
+
+const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
+const intToChar = new Uint8Array(64); // 64 possible chars.
+const charToInt = new Uint8Array(128); // z is 122 in ASCII
+
+for (let i = 0; i < chars.length; i++) {
+  const c = chars.charCodeAt(i);
+  intToChar[i] = c;
+  charToInt[c] = i;
+}
+
+export function decodeInteger(reader: StringReader, relative: number): number {
+  let value = 0;
+  let shift = 0;
+  let integer = 0;
+
+  do {
+    const c = reader.next();
+    integer = charToInt[c];
+    value |= (integer & 31) << shift;
+    shift += 5;
+  } while (integer & 32);
+
+  const shouldNegate = value & 1;
+  value >>>= 1;
+
+  if (shouldNegate) {
+    value = -0x80000000 | -value;
+  }
+
+  return relative + value;
+}
+
+export function encodeInteger(builder: StringWriter, num: number, relative: number): number {
+  let delta = num - relative;
+
+  delta = delta < 0 ? (-delta << 1) | 1 : delta << 1;
+  do {
+    let clamped = delta & 0b011111;
+    delta >>>= 5;
+    if (delta > 0) clamped |= 0b100000;
+    builder.write(intToChar[clamped]);
+  } while (delta > 0);
+
+  return num;
+}
+
+export function hasMoreVlq(reader: StringReader, max: number) {
+  if (reader.pos >= max) return false;
+  return reader.peek() !== comma;
+}