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// Copyright (C) 2017 Ecma International. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
description: |
This regex makes a best-effort determination that the tested string matches
the NativeFunction grammar production without requiring a correct tokeniser.
---*/
const NATIVE_FUNCTION_RE = /\bfunction\b[\s\S]*\([\s\S]*\)[\s\S]*\{[\s\S]*\[[\s\S]*\bnative\b[\s\S]+\bcode\b[\s\S]*\][\s\S]*\}/;
const assertToStringOrNativeFunction = function(fn, expected) {
const actual = "" + fn;
try {
assert.sameValue(actual, expected);
} catch (unused) {
assertNativeFunction(fn);
}
};
const assertNativeFunction = function(fn) {
const actual = "" + fn;
assert(NATIVE_FUNCTION_RE.test(actual), "looks pretty much like a NativeFunction");
};
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