1 files changed, 44 insertions, 0 deletions
diff --git a/dom/webgpu/tests/cts/checkout/src/common/internal/query/stringify_params.ts b/dom/webgpu/tests/cts/checkout/src/common/internal/query/stringify_params.ts
new file mode 100644
index 0000000000..907cc0791a
--- /dev/null
+++ b/dom/webgpu/tests/cts/checkout/src/common/internal/query/stringify_params.ts
@@ -0,0 +1,44 @@
+import { TestParams } from '../../framework/fixture.js';
+import { assert } from '../../util/util.js';
+import { JSONWithUndefined, badParamValueChars, paramKeyIsPublic } from '../params_utils.js';
+
+import { stringifyParamValue, stringifyParamValueUniquely } from './json_param_value.js';
+import { kParamKVSeparator, kParamSeparator, kWildcard } from './separators.js';
+
+export function stringifyPublicParams(p: TestParams, addWildcard = false): string {
+  const parts = Object.keys(p)
+    .filter(k => paramKeyIsPublic(k))
+    .map(k => stringifySingleParam(k, p[k]));
+
+  if (addWildcard) parts.push(kWildcard);
+
+  return parts.join(kParamSeparator);
+}
+
+/**
+ * An _approximately_ unique string representing a CaseParams value.
+ */
+export function stringifyPublicParamsUniquely(p: TestParams): string {
+  const keys = Object.keys(p).sort();
+  return keys
+    .filter(k => paramKeyIsPublic(k))
+    .map(k => stringifySingleParamUniquely(k, p[k]))
+    .join(kParamSeparator);
+}
+
+export function stringifySingleParam(k: string, v: JSONWithUndefined) {
+  return `${k}${kParamKVSeparator}${stringifySingleParamValue(v)}`;
+}
+
+function stringifySingleParamUniquely(k: string, v: JSONWithUndefined) {
+  return `${k}${kParamKVSeparator}${stringifyParamValueUniquely(v)}`;
+}
+
+function stringifySingleParamValue(v: JSONWithUndefined): string {
+  const s = stringifyParamValue(v);
+  assert(
+    !badParamValueChars.test(s),
+    `JSON.stringified param value must not match ${badParamValueChars} - was ${s}`
+  );
+  return s;
+}