groups-object-subclass.js (1123B)
1 // Copyright 2017 the V8 project authors. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 4 /*--- 5 description: > 6 Test the groups object on RegExp subclass results that have their own. 7 esid: sec-regexpbuiltinexec 8 features: [regexp-named-groups] 9 info: | 10 Runtime Semantics: RegExpBuiltinExec ( R, S ) 11 24. If _R_ contains any |GroupName|, then 12 a. Let _groups_ be ObjectCreate(*null*). 13 25. Else, 14 a. Let _groups_ be *undefined*. 15 26. Perform ! CreateDataProperty(_A_, `"groups"`, _groups_). 16 ---*/ 17 18 class FakeRegExp extends RegExp { 19 exec(subject) { 20 const fakeResult = ["ab", "a"]; 21 fakeResult.index = 0; 22 fakeResult.groups = { a: "b" }; 23 Object.getPrototypeOf(fakeResult.groups).b = "c"; 24 return fakeResult; 25 } 26 }; 27 28 const re = new FakeRegExp(); 29 const result = re.exec("ab"); 30 assert.sameValue(Object.getPrototypeOf(result), Array.prototype); 31 assert(result.hasOwnProperty("groups")); 32 assert.sameValue("b", result.groups.a); 33 assert.sameValue("b", "ab".replace(re, "$<a>")); 34 assert.sameValue("c", "ab".replace(re, "$<b>")); 35 36 reportCompare(0, 0);