1 // Copyright 2012 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 // Summary of the spec: lastIndex is reset to 0 if 29 // - a regexp fails to match, regardless of global or non-global. 30 // - a global regexp is used in a function that returns multiple results, 31 // such as String.prototype.replace or String.prototype.match, since it 32 // repeats the regexp until it fails to match. 33 // Otherwise lastIndex is only set when a global regexp matches, to the index 34 // after the match. 35 36 // Test Regexp.prototype.exec 37 r = /a/; 38 r.lastIndex = 1; 39 r.exec("zzzz"); 40 assertEquals(0, r.lastIndex); 41 42 // Test Regexp.prototype.test 43 r = /a/; 44 r.lastIndex = 1; 45 r.test("zzzz"); 46 assertEquals(0, r.lastIndex); 47 48 // Test String.prototype.match 49 r = /a/; 50 r.lastIndex = 1; 51 "zzzz".match(r); 52 assertEquals(0, r.lastIndex); 53 54 // Test String.prototype.replace with atomic regexp and empty string. 55 r = /a/; 56 r.lastIndex = 1; 57 "zzzz".replace(r, ""); 58 assertEquals(0, r.lastIndex); 59 60 // Test String.prototype.replace with non-atomic regexp and empty string. 61 r = /\d/; 62 r.lastIndex = 1; 63 "zzzz".replace(r, ""); 64 assertEquals(0, r.lastIndex); 65 66 // Test String.prototype.replace with atomic regexp and non-empty string. 67 r = /a/; 68 r.lastIndex = 1; 69 "zzzz".replace(r, "a"); 70 assertEquals(0, r.lastIndex); 71 72 // Test String.prototype.replace with non-atomic regexp and non-empty string. 73 r = /\d/; 74 r.lastIndex = 1; 75 "zzzz".replace(r, "a"); 76 assertEquals(0, r.lastIndex); 77 78 // Test String.prototype.replace with replacement function 79 r = /a/; 80 r.lastIndex = 1; 81 "zzzz".replace(r, function() { return ""; }); 82 assertEquals(0, r.lastIndex); 83 84 // Regexp functions that returns multiple results: 85 // A global regexp always resets lastIndex regardless of whether it matches. 86 r = /a/g; 87 r.lastIndex = -1; 88 "0123abcd".replace(r, "x"); 89 assertEquals(0, r.lastIndex); 90 91 r.lastIndex = -1; 92 "01234567".replace(r, "x"); 93 assertEquals(0, r.lastIndex); 94 95 r.lastIndex = -1; 96 "0123abcd".match(r); 97 assertEquals(0, r.lastIndex); 98 99 r.lastIndex = -1; 100 "01234567".match(r); 101 assertEquals(0, r.lastIndex); 102 103 // A non-global regexp resets lastIndex iff it does not match. 104 r = /a/; 105 r.lastIndex = -1; 106 "0123abcd".replace(r, "x"); 107 assertEquals(-1, r.lastIndex); 108 109 r.lastIndex = -1; 110 "01234567".replace(r, "x"); 111 assertEquals(0, r.lastIndex); 112 113 r.lastIndex = -1; 114 "0123abcd".match(r); 115 assertEquals(-1, r.lastIndex); 116 117 r.lastIndex = -1; 118 "01234567".match(r); 119 assertEquals(0, r.lastIndex); 120 121 // Also test RegExp.prototype.exec and RegExp.prototype.test 122 r = /a/g; 123 r.lastIndex = 1; 124 r.exec("01234567"); 125 assertEquals(0, r.lastIndex); 126 127 r.lastIndex = 1; 128 r.exec("0123abcd"); 129 assertEquals(5, r.lastIndex); 130 131 r = /a/; 132 r.lastIndex = 1; 133 r.exec("01234567"); 134 assertEquals(0, r.lastIndex); 135 136 r.lastIndex = 1; 137 r.exec("0123abcd"); 138 assertEquals(1, r.lastIndex); 139 140 r = /a/g; 141 r.lastIndex = 1; 142 r.test("01234567"); 143 assertEquals(0, r.lastIndex); 144 145 r.lastIndex = 1; 146 r.test("0123abcd"); 147 assertEquals(5, r.lastIndex); 148 149 r = /a/; 150 r.lastIndex = 1; 151 r.test("01234567"); 152 assertEquals(0, r.lastIndex); 153 154 r.lastIndex = 1; 155 r.test("0123abcd"); 156 assertEquals(1, r.lastIndex); 157
