[regexp] Create property on result for each named capture

test/mjsunit/harmony/regexp-named-captures.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --harmony-regexp-named-captures
 
 // Malformed named captures.
 assertThrows("/(?<>a)/u");  // Empty name.
 assertThrows("/(?<aa)/u");  // Unterminated name.
 assertThrows("/(?<42a>a)/u");  // Name starting with digits.
 assertThrows("/(?<:a>a)/u");  // Name starting with invalid char.
 assertThrows("/(?<a:>a)/u");  // Name containing with invalid char.
 assertThrows("/(?<a>a)(?<a>a)/u");  // Duplicate name.
 assertThrows("/(?<a>a)(?<b>b)(?<a>a)/u");  // Duplicate name.
 assertThrows("/\\k<a>/u");  // Invalid reference.
 assertThrows("/(?<a>a)\\k<ab>/u");  // Invalid reference.
 assertThrows("/(?<ab>a)\\k<a>/u");  // Invalid reference.
 assertThrows("/\\k<a>(?<ab>a)/u");  // Invalid reference.
 
 // Fallback behavior in non-unicode mode.
-assertThrows("/(?<>a)/");
-assertThrows("/(?<aa)/");
-assertThrows("/(?<42a>a)/");
-assertThrows("/(?<:a>a)/");
-assertThrows("/(?<a:>a)/");
-assertThrows("/(?<a>a)(?<a>a)/");
-assertThrows("/(?<a>a)(?<b>b)(?<a>a)/");
-assertThrows("/(?<a>a)\\k<ab>/");
-assertThrows("/(?<ab>a)\\k<a>/");
+assertThrows("/(?<>a)/", SyntaxError);
+assertThrows("/(?<aa)/", SyntaxError);
+assertThrows("/(?<42a>a)/", SyntaxError);
+assertThrows("/(?<:a>a)/", SyntaxError);
+assertThrows("/(?<a:>a)/", SyntaxError);
+assertThrows("/(?<a>a)(?<a>a)/", SyntaxError);
+assertThrows("/(?<a>a)(?<b>b)(?<a>a)/", SyntaxError);
+assertThrows("/(?<a>a)\\k<ab>/", SyntaxError);
+assertThrows("/(?<ab>a)\\k<a>/", SyntaxError);
 
 assertEquals(["k<a>"], "xxxk<a>xxx".match(/\k<a>/));
 assertEquals(["k<a"], "xxxk<a>xxx".match(/\k<a/));
 
 // Basic named groups.
 assertEquals(["a", "a"], "bab".match(/(?<a>a)/u));
 assertEquals(["a", "a"], "bab".match(/(?<a42>a)/u));
 assertEquals(["a", "a"], "bab".match(/(?<_>a)/u));
 assertEquals(["a", "a"], "bab".match(/(?<$>a)/u));
 assertEquals(["bab", "a"], "bab".match(/.(?<$>a)./u));
@@ skipping 27 matching lines @@
 
 // Nested groups.
 assertEquals(["bab", "bab", "ab", "b"], "bab".match(/(?<a>.(?<b>.(?<c>.)))/u));
 
 // Reference inside group.
 assertEquals(["bab", "b"], "bab".match(/(?<a>\k<a>\w)../u));
 
 // Reference before group.
 assertEquals(["bab", "b"], "bab".match(/\k<a>(?<a>b)\w\k<a>/u));
 assertEquals(["bab", "b", "a"], "bab".match(/(?<b>b)\k<a>(?<a>a)\k<b>/u));
+
+// Reference properties.
+assertEquals("a", /(?<a>a)(?<b>b)\k<a>/u.exec("aba").group.a);
+assertEquals("b", /(?<a>a)(?<b>b)\k<a>/u.exec("aba").group.b);
+assertEquals(undefined, /(?<a>a)(?<b>b)\k<a>/u.exec("aba").group.c);
+assertEquals(undefined, /(?<a>a)(?<b>b)\k<a>|(?<c>c)/u.exec("aba").group.c);
+
+// Unicode names.
+assertEquals("a", /(?<π>a)/u.exec("bab").group.π);
+assertEquals("a", /(?<\u{03C0}>a)/u.exec("bab").group.\u03C0);
+assertEquals("a", /(?<$>a)/u.exec("bab").group.$);
+assertEquals("a", /(?<_>a)/u.exec("bab").group._);
+assertEquals("a", /(?<$𐒤>a)/u.exec("bab").group.$𐒤);
+assertEquals("a", /(?<_\u200C>a)/u.exec("bab").group._\u200C);
+assertEquals("a", /(?<_\u200D>a)/u.exec("bab").group._\u200D);
+assertEquals("a", /(?<ಠ_ಠ>a)/u.exec("bab").group.ಠ_ಠ);
+assertThrows('/(?<❤>a)/u', SyntaxError);
+assertThrows('/(?<𐒤>a)/u', SyntaxError);  // ID_Continue but not ID_Start.
+
+// The '__proto__' property on the groups object.
+assertEquals(undefined, /(?<a>.)/u.exec("a").group.__proto__);
+assertEquals("a", /(?<__proto__>a)/u.exec("a").group.__proto__);