JezK
Edit File: string-slices.js
// Copyright 2011 the V8 project authors. All rights reserved. // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following // disclaimer in the documentation and/or other materials provided // with the distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived // from this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. // Flags: --expose-externalize-string --allow-natives-syntax var s = 'abcdefghijklmn'; assertEquals(s, s.substr()); assertEquals(s, s.substr(0)); assertEquals(s, s.substr('0')); assertEquals(s, s.substr(void 0)); assertEquals(s, s.substr(null)); assertEquals(s, s.substr(false)); assertEquals(s, s.substr(0.9)); assertEquals(s, s.substr({ valueOf: function() { return 0; } })); assertEquals(s, s.substr({ toString: function() { return '0'; } })); var s1 = s.substring(1); assertEquals(s1, s.substr(1)); assertEquals(s1, s.substr('1')); assertEquals(s1, s.substr(true)); assertEquals(s1, s.substr(1.1)); assertEquals(s1, s.substr({ valueOf: function() { return 1; } })); assertEquals(s1, s.substr({ toString: function() { return '1'; } })); assertEquals(s.substring(s.length - 1), s.substr(-1)); assertEquals(s.substring(s.length - 1), s.substr(-1.2)); assertEquals(s.substring(s.length - 1), s.substr(-1.7)); assertEquals(s.substring(s.length - 2), s.substr(-2)); assertEquals(s.substring(s.length - 2), s.substr(-2.3)); assertEquals(s.substring(s.length - 2, s.length - 1), s.substr(-2, 1)); assertEquals(s, s.substr(-100)); assertEquals('abc', s.substr(-100, 3)); assertEquals(s1, s.substr(-s.length + 1)); // assertEquals('', s.substr(0, void 0)); // smjs and rhino assertEquals('abcdefghijklmn', s.substr(0, void 0)); // kjs and v8 assertEquals('', s.substr(0, null)); assertEquals(s, s.substr(0, String(s.length))); assertEquals('a', s.substr(0, true)); // Test substrings of different lengths and alignments. // First ASCII. var x = "ASCII"; for (var i = 0; i < 25; i++) { x += (i >> 4).toString(16) + (i & 0x0f).toString(16); } /x/.exec(x); // Try to force a flatten. for (var i = 5; i < 25; i++) { for (var j = 0; j < 25; j++) { var z = x.substring(i, i+j); var w = Math.random() * 42; // Allocate something new in new-space. assertEquals(j, z.length); for (var k = 0; k < j; k++) { assertEquals(x.charAt(i+k), z.charAt(k)); } } } // Then two-byte strings. x = "UC16\u2028"; // Non-ascii char forces two-byte string. for (var i = 0; i < 25; i++) { x += (i >> 4).toString(16) + (i & 0x0f).toString(16); } /x/.exec(x); // Try to force a flatten. for (var i = 5; i < 25; i++) { for (var j = 0; j < 25; j++) { var z = x.substring(i, i + j); var w = Math.random() * 42; // Allocate something new in new-space. assertEquals(j, z.length); for (var k = 0; k < j; k++) { assertEquals(x.charAt(i+k), z.charAt(k)); } } } // Keep creating strings to to force allocation failure on substring creation. var x = "0123456789ABCDEF"; for (var i = 0; i < 8; i++) x += x; var xl = x.length; var cache = []; for (var i = 0; i < 1000; i++) { var z = x.substring(i % xl); assertEquals(xl - (i % xl), z.length); cache.push(z); } // Same with two-byte strings var x = "\u2028123456789ABCDEF"; for (var i = 0; i < 8; i++) x += x; var xl = x.length; var cache = []; for (var i = 0; i < 1000; i++) { var z = x.substring(i % xl); assertEquals(xl - (i % xl), z.length); cache.push(z); } // Substring of substring. var cache = []; var last = x; var offset = 0; for (var i = 0; i < 64; i++) { var z = last.substring(i); last = z; cache.push(z); offset += i; } for (var i = 63; i >= 0; i--) { var z = cache.pop(); assertTrue(/\u2028123456789ABCDEF/.test(z)); assertEquals(xl - offset, z.length); assertEquals(x.charAt(i*(i+1)/2), z.charAt(0)); offset -= i; } // Test charAt for different strings. function f(s1, s2, s3, i) { assertEquals(String.fromCharCode(97+i%11), s1.charAt(i%11)); assertEquals(String.fromCharCode(97+i%11), s2.charAt(i%11)); assertEquals(String.fromCharCode(98+i%11), s3.charAt(i%11)); assertEquals(String.fromCharCode(101), s3.charAt(3)); } flat = "abcdefghijkl12345"; cons = flat + flat.toUpperCase(); slice = "abcdefghijklmn12345".slice(1, -1); for ( var i = 0; i < 1000; i++) { f(flat, cons, slice, i); } flat = "abcdefghijkl1\u20232345"; cons = flat + flat.toUpperCase(); slice = "abcdefghijklmn1\u20232345".slice(1, -1); for ( var i = 0; i < 1000; i++) { f(flat, cons, slice, i); } // Short substrings. flat = "abcdefghijkl12345"; cons = flat + flat.toUpperCase(); /x/.exec(cons); // Flatten cons slice = "abcdefghijklmn12345".slice(1, -1); assertEquals("cdefg", flat.substr(2, 5)); assertEquals("cdefg", cons.substr(2, 5)); assertEquals("cdefg", slice.substr(1, 5)); flat = "abc\u1234defghijkl12345"; cons = flat + flat.toUpperCase(); /x/.exec(cons); // Flatten cons slice = "abc\u1234defghijklmn12345".slice(1, -1); assertEquals("c\u1234def", flat.substr(2, 5)); assertEquals("c\u1234def", cons.substr(2, 5)); assertEquals("c\u1234def", slice.substr(1, 5)); // Concatenate substrings. var ascii = 'abcdefghijklmnop'; var utf = '\u03B1\u03B2\u03B3\u03B4\u03B5\u03B6\u03B7\u03B8\u03B9\u03BA\u03BB'; assertEquals("klmno", ascii.substring(10,15) + ascii.substring(16)); assertEquals("\u03B4\u03B7", utf.substring(3,4) + utf.substring(6,7)); assertEquals("klp", ascii.substring(10,12) + ascii.substring(15,16)); assertEquals("\u03B1\u03B4\u03B5", utf.substring(0,1) + utf.substring(5,3)); assertEquals("", ascii.substring(16) + utf.substring(16)); assertEquals("bcdef\u03B4\u03B5\u03B6\u03B7\u03B8\u03B9", ascii.substring(1,6) + utf.substring(3,9)); assertEquals("\u03B4\u03B5\u03B6\u03B7\u03B8\u03B9abcdefghijklmnop", utf.substring(3,9) + ascii); assertEquals("\u03B2\u03B3\u03B4\u03B5\u03B4\u03B5\u03B6\u03B7", utf.substring(5,1) + utf.substring(3,7)); // Externalizing strings. var a = "123456789" + "qwertyuiopasdfghjklzxcvbnm"; var b = "23456789qwertyuiopasdfghjklzxcvbn" assertEquals(a.slice(1,-1), b); assertTrue(isAsciiString(a)); externalizeString(a, true); assertFalse(isAsciiString(a)); assertEquals(a.slice(1,-1), b); assertTrue(/3456789qwe/.test(a)); assertEquals(5, a.indexOf("678")); assertEquals("12345", a.split("6")[0]); // Create a slice with an external string as parent string. var c = a.slice(1,-1); function test_crankshaft() { for (var i = 0; i < 20; i++) { assertEquals(b.charAt(i), a.charAt(i + 1)); assertEquals(b.charAt(i), c.charAt(i)); assertEquals(b.charAt(4), c.charAt(4)); assertTrue(/3456789qwe/.test(c)); assertEquals(4, c.indexOf("678")); assertEquals("2345", c.split("6")[0]); } } test_crankshaft(); %OptimizeFunctionOnNextCall(test_crankshaft); test_crankshaft();