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      1 // Copyright 2015 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 // Flags: --harmony-regexp-named-captures
      6 
      7 // Malformed named captures.
      8 assertThrows("/(?<>a)/u");  // Empty name.
      9 assertThrows("/(?<aa)/u");  // Unterminated name.
     10 assertThrows("/(?<42a>a)/u");  // Name starting with digits.
     11 assertThrows("/(?<:a>a)/u");  // Name starting with invalid char.
     12 assertThrows("/(?<a:>a)/u");  // Name containing with invalid char.
     13 assertThrows("/(?<a>a)(?<a>a)/u");  // Duplicate name.
     14 assertThrows("/(?<a>a)(?<b>b)(?<a>a)/u");  // Duplicate name.
     15 assertThrows("/\\k<a>/u");  // Invalid reference.
     16 assertThrows("/(?<a>a)\\k<ab>/u");  // Invalid reference.
     17 assertThrows("/(?<ab>a)\\k<a>/u");  // Invalid reference.
     18 assertThrows("/\\k<a>(?<ab>a)/u");  // Invalid reference.
     19 
     20 // Fallback behavior in non-unicode mode.
     21 assertThrows("/(?<>a)/");
     22 assertThrows("/(?<aa)/");
     23 assertThrows("/(?<42a>a)/");
     24 assertThrows("/(?<:a>a)/");
     25 assertThrows("/(?<a:>a)/");
     26 assertThrows("/(?<a>a)(?<a>a)/");
     27 assertThrows("/(?<a>a)(?<b>b)(?<a>a)/");
     28 assertThrows("/(?<a>a)\\k<ab>/");
     29 assertThrows("/(?<ab>a)\\k<a>/");
     30 
     31 assertEquals(["k<a>"], "xxxk<a>xxx".match(/\k<a>/));
     32 assertEquals(["k<a"], "xxxk<a>xxx".match(/\k<a/));
     33 
     34 // Basic named groups.
     35 assertEquals(["a", "a"], "bab".match(/(?<a>a)/u));
     36 assertEquals(["a", "a"], "bab".match(/(?<a42>a)/u));
     37 assertEquals(["a", "a"], "bab".match(/(?<_>a)/u));
     38 assertEquals(["a", "a"], "bab".match(/(?<$>a)/u));
     39 assertEquals(["bab", "a"], "bab".match(/.(?<$>a)./u));
     40 assertEquals(["bab", "a", "b"], "bab".match(/.(?<a>a)(.)/u));
     41 assertEquals(["bab", "a", "b"], "bab".match(/.(?<a>a)(?<b>.)/u));
     42 assertEquals(["bab", "ab"], "bab".match(/.(?<a>\w\w)/u));
     43 assertEquals(["bab", "bab"], "bab".match(/(?<a>\w\w\w)/u));
     44 assertEquals(["bab", "ba", "b"], "bab".match(/(?<a>\w\w)(?<b>\w)/u));
     45 
     46 assertEquals("bab".match(/(a)/u), "bab".match(/(?<a>a)/u));
     47 assertEquals("bab".match(/(a)/u), "bab".match(/(?<a42>a)/u));
     48 assertEquals("bab".match(/(a)/u), "bab".match(/(?<_>a)/u));
     49 assertEquals("bab".match(/(a)/u), "bab".match(/(?<$>a)/u));
     50 assertEquals("bab".match(/.(a)./u), "bab".match(/.(?<$>a)./u));
     51 assertEquals("bab".match(/.(a)(.)/u), "bab".match(/.(?<a>a)(.)/u));
     52 assertEquals("bab".match(/.(a)(.)/u), "bab".match(/.(?<a>a)(?<b>.)/u));
     53 assertEquals("bab".match(/.(\w\w)/u), "bab".match(/.(?<a>\w\w)/u));
     54 assertEquals("bab".match(/(\w\w\w)/u), "bab".match(/(?<a>\w\w\w)/u));
     55 assertEquals("bab".match(/(\w\w)(\w)/u), "bab".match(/(?<a>\w\w)(?<b>\w)/u));
     56 
     57 assertEquals(["bab", "b"], "bab".match(/(?<b>b).\1/u));
     58 assertEquals(["baba", "b", "a"], "baba".match(/(.)(?<a>a)\1\2/u));
     59 assertEquals(["baba", "b", "a", "b", "a"],
     60     "baba".match(/(.)(?<a>a)(?<b>\1)(\2)/u));
     61 assertEquals(["<a", "<"], "<a".match(/(?<lt><)a/u));
     62 assertEquals([">a", ">"], ">a".match(/(?<gt>>)a/u));
     63 
     64 // Named references.
     65 assertEquals(["bab", "b"], "bab".match(/(?<b>.).\k<b>/u));
     66 assertNull("baa".match(/(?<b>.).\k<b>/u));
     67 
     68 // Nested groups.
     69 assertEquals(["bab", "bab", "ab", "b"], "bab".match(/(?<a>.(?<b>.(?<c>.)))/u));
     70 
     71 // Reference inside group.
     72 assertEquals(["bab", "b"], "bab".match(/(?<a>\k<a>\w)../u));
     73 
     74 // Reference before group.
     75 assertEquals(["bab", "b"], "bab".match(/\k<a>(?<a>b)\w\k<a>/u));
     76 assertEquals(["bab", "b", "a"], "bab".match(/(?<b>b)\k<a>(?<a>a)\k<b>/u));
     77