string-slices.js revision 69a99ed0b2b2ef69d393c371b03db3a98aaf880e
1// Copyright 2008 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// Flags: --string-slices --expose-externalize-string 29 30var s = 'abcdefghijklmn'; 31assertEquals(s, s.substr()); 32assertEquals(s, s.substr(0)); 33assertEquals(s, s.substr('0')); 34assertEquals(s, s.substr(void 0)); 35assertEquals(s, s.substr(null)); 36assertEquals(s, s.substr(false)); 37assertEquals(s, s.substr(0.9)); 38assertEquals(s, s.substr({ valueOf: function() { return 0; } })); 39assertEquals(s, s.substr({ toString: function() { return '0'; } })); 40 41var s1 = s.substring(1); 42assertEquals(s1, s.substr(1)); 43assertEquals(s1, s.substr('1')); 44assertEquals(s1, s.substr(true)); 45assertEquals(s1, s.substr(1.1)); 46assertEquals(s1, s.substr({ valueOf: function() { return 1; } })); 47assertEquals(s1, s.substr({ toString: function() { return '1'; } })); 48 49 50assertEquals(s.substring(s.length - 1), s.substr(-1)); 51assertEquals(s.substring(s.length - 1), s.substr(-1.2)); 52assertEquals(s.substring(s.length - 1), s.substr(-1.7)); 53assertEquals(s.substring(s.length - 2), s.substr(-2)); 54assertEquals(s.substring(s.length - 2), s.substr(-2.3)); 55assertEquals(s.substring(s.length - 2, s.length - 1), s.substr(-2, 1)); 56assertEquals(s, s.substr(-100)); 57assertEquals('abc', s.substr(-100, 3)); 58assertEquals(s1, s.substr(-s.length + 1)); 59 60// assertEquals('', s.substr(0, void 0)); // smjs and rhino 61assertEquals('abcdefghijklmn', s.substr(0, void 0)); // kjs and v8 62assertEquals('', s.substr(0, null)); 63assertEquals(s, s.substr(0, String(s.length))); 64assertEquals('a', s.substr(0, true)); 65 66 67// Test substrings of different lengths and alignments. 68// First ASCII. 69var x = "ASCII"; 70for (var i = 0; i < 25; i++) { 71 x += (i >> 4).toString(16) + (i & 0x0f).toString(16); 72} 73/x/.exec(x); // Try to force a flatten. 74for (var i = 5; i < 25; i++) { 75 for (var j = 0; j < 25; j++) { 76 var z = x.substring(i, i+j); 77 var w = Math.random() * 42; // Allocate something new in new-space. 78 assertEquals(j, z.length); 79 for (var k = 0; k < j; k++) { 80 assertEquals(x.charAt(i+k), z.charAt(k)); 81 } 82 } 83} 84// Then two-byte strings. 85x = "UC16\u2028"; // Non-ascii char forces two-byte string. 86for (var i = 0; i < 25; i++) { 87 x += (i >> 4).toString(16) + (i & 0x0f).toString(16); 88} 89/x/.exec(x); // Try to force a flatten. 90for (var i = 5; i < 25; i++) { 91 for (var j = 0; j < 25; j++) { 92 var z = x.substring(i, i + j); 93 var w = Math.random() * 42; // Allocate something new in new-space. 94 assertEquals(j, z.length); 95 for (var k = 0; k < j; k++) { 96 assertEquals(x.charAt(i+k), z.charAt(k)); 97 } 98 } 99} 100 101// Keep creating strings to to force allocation failure on substring creation. 102var x = "0123456789ABCDEF"; 103x += x; // 2^5 104x += x; 105x += x; 106x += x; 107x += x; 108x += x; // 2^10 109x += x; 110x += x; 111var xl = x.length; 112var cache = []; 113for (var i = 0; i < 1000; i++) { 114 var z = x.substring(i % xl); 115 assertEquals(xl - (i % xl), z.length); 116 cache.push(z); 117} 118 119 120// Same with two-byte strings 121var x = "\u2028123456789ABCDEF"; 122x += x; // 2^5 123x += x; 124x += x; 125x += x; 126x += x; 127x += x; // 2^10 128x += x; 129x += x; 130var xl = x.length; 131var cache = []; 132for (var i = 0; i < 1000; i++) { 133 var z = x.substring(i % xl); 134 assertEquals(xl - (i % xl), z.length); 135 cache.push(z); 136} 137 138// Substring of substring. 139var cache = []; 140var last = x; 141var offset = 0; 142for (var i = 0; i < 64; i++) { 143 var z = last.substring(i); 144 last = z; 145 cache.push(z); 146 offset += i; 147} 148for (var i = 63; i >= 0; i--) { 149 var z = cache.pop(); 150 assertTrue(/\u2028123456789ABCDEF/.test(z)); 151 assertEquals(xl - offset, z.length); 152 assertEquals(x.charAt(i*(i+1)/2), z.charAt(0)); 153 offset -= i; 154} 155 156// Test charAt for different strings. 157function f(s1, s2, s3, i) { 158 assertEquals(String.fromCharCode(97+i%11), s1.charAt(i%11)); 159 assertEquals(String.fromCharCode(97+i%11), s2.charAt(i%11)); 160 assertEquals(String.fromCharCode(98+i%11), s3.charAt(i%11)); 161 assertEquals(String.fromCharCode(101), s3.charAt(3)); 162} 163 164flat = "abcdefghijkl12345"; 165cons = flat + flat.toUpperCase(); 166slice = "abcdefghijklmn12345".slice(1, -1); 167for ( var i = 0; i < 1000; i++) { 168 f(flat, cons, slice, i); 169} 170flat = "abcdefghijkl1\u20232345"; 171cons = flat + flat.toUpperCase(); 172slice = "abcdefghijklmn1\u20232345".slice(1, -1); 173for ( var i = 0; i < 1000; i++) { 174 f(flat, cons, slice, i); 175} 176 177// Concatenate substrings. 178var ascii = 'abcdefghijklmnop'; 179var utf = '\u03B1\u03B2\u03B3\u03B4\u03B5\u03B6\u03B7\u03B8\u03B9\u03BA\u03BB'; 180assertEquals("klmno", ascii.substring(10,15) + ascii.substring(16)); 181assertEquals("\u03B4\u03B7", utf.substring(3,4) + utf.substring(6,7)); 182assertEquals("klp", ascii.substring(10,12) + ascii.substring(15,16)); 183assertEquals("\u03B1\u03B4\u03B5", utf.substring(0,1) + utf.substring(5,3)); 184assertEquals("", ascii.substring(16) + utf.substring(16)); 185assertEquals("bcdef\u03B4\u03B5\u03B6\u03B7\u03B8\u03B9", 186 ascii.substring(1,6) + utf.substring(3,9)); 187assertEquals("\u03B4\u03B5\u03B6\u03B7\u03B8\u03B9abcdefghijklmnop", 188 utf.substring(3,9) + ascii); 189assertEquals("\u03B2\u03B3\u03B4\u03B5\u03B4\u03B5\u03B6\u03B7", 190 utf.substring(5,1) + utf.substring(3,7)); 191 192/* 193// Externalizing strings. 194var a = "123456789qwertyuiopasdfghjklzxcvbnm"; 195var b = a.slice(1,-1); 196assertEquals(a.slice(1,-1), b); 197externalizeString(a); 198assertEquals(a.slice(1,-1), b); 199*/