Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1 | // Copyright 2016 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | var log = []; |
| 6 | |
| 7 | var fake = |
| 8 | { |
| 9 | get source() { |
| 10 | log.push("p"); |
| 11 | return { |
| 12 | toString: function() { |
| 13 | log.push("ps"); |
| 14 | return "pattern"; |
| 15 | } |
| 16 | }; |
| 17 | }, |
| 18 | get flags() { |
| 19 | log.push("f"); |
| 20 | return { |
| 21 | toString: function() { |
| 22 | log.push("fs"); |
| 23 | return "flags"; |
| 24 | } |
| 25 | }; |
| 26 | } |
| 27 | } |
| 28 | |
| 29 | function testThrows(x) { |
| 30 | try { |
| 31 | RegExp.prototype.toString.call(x); |
| 32 | } catch (e) { |
| 33 | assertTrue(/incompatible receiver/.test(e.message)); |
| 34 | return; |
| 35 | } |
| 36 | assertUnreachable(); |
| 37 | } |
| 38 | |
| 39 | testThrows(1); |
| 40 | testThrows(null); |
| 41 | Number.prototype.source = "a"; |
| 42 | Number.prototype.flags = "b"; |
| 43 | testThrows(1); |
| 44 | |
| 45 | assertEquals("/pattern/flags", RegExp.prototype.toString.call(fake)); |
| 46 | assertEquals(["p", "ps", "f", "fs"], log); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 47 | |
| 48 | // Monkey-patching is also possible on RegExp instances |
| 49 | |
| 50 | let weird = /foo/; |
| 51 | Object.defineProperty(weird, 'flags', {value: 'bar'}); |
| 52 | Object.defineProperty(weird, 'source', {value: 'baz'}); |
| 53 | assertEquals('/baz/bar', weird.toString()); |
| 54 | |
| 55 | assertEquals('/(?:)/', RegExp.prototype.toString()); |
| 56 | assertEquals('(?:)', RegExp.prototype.source); |
| 57 | assertEquals('', RegExp.prototype.flags); |