| // 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"); |
| }; |
