JezK
Edit File: delete.js
// Copyright 2008 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. // We use the has() function to avoid relying on a functioning // implementation of 'in'. function has(o, k) { return typeof o[k] !== 'undefined'; } assertTrue(delete null); assertTrue(delete 2); assertTrue(delete 'foo'); assertTrue(delete Number(7)); assertTrue(delete new Number(8)); assertTrue(delete {}.x); assertTrue(delete {}.y); assertTrue(delete {}.toString); x = 42; assertEquals(42, x); assertTrue(delete x); assertTrue(typeof x === 'undefined', "x is gone"); var y = 87; // should have DontDelete attribute assertEquals(87, y); assertFalse(delete y, "don't delete"); assertFalse(typeof y === 'undefined'); assertEquals(87, y); var o = { x: 42, y: 87 }; assertTrue(has(o, 'x')); assertTrue(has(o, 'y')); assertTrue(delete o.x); assertFalse(has(o, 'x')); assertTrue(has(o, 'y')); assertTrue(delete o['y']); assertFalse(has(o, 'x')); assertFalse(has(o, 'y')); var o = {}; for (var i = 0x0020; i < 0x02ff; i+=2) { o[String.fromCharCode(i)] = i; o[String.fromCharCode(i+1)] = i+1; } for (var i = 0x0020; i < 0x02ff; i+=2) { assertTrue(delete o[String.fromCharCode(i)]); } for (var i = 0x0020; i < 0x02ff; i+=2) { assertFalse(has(o, String.fromCharCode(i)), "deleted (" + i + ")"); assertTrue(has(o, String.fromCharCode(i+1)), "still here (" + i + ")"); } var a = [0,1,2]; assertTrue(has(a, 0)); assertTrue(delete a[0]); assertFalse(has(a, 0), "delete 0"); assertEquals(1, a[1]); assertEquals(2, a[2]); assertTrue(delete a[100], "delete 100"); assertTrue(delete a[Math.pow(2,31)-1], "delete 2^31-1"); assertFalse(has(a, 0), "delete 0"); assertEquals(1, a[1]); assertEquals(2, a[2]); var a = [0,1,2]; assertEquals(3, a.length); assertTrue(delete a[2]); assertEquals(3, a.length); assertTrue(delete a[0]); assertEquals(3, a.length); assertTrue(delete a[1]); assertEquals(3, a.length); var o = {}; o[Math.pow(2,30)-1] = 0; o[Math.pow(2,31)-1] = 0; o[1] = 0; assertTrue(delete o[0]); assertTrue(delete o[Math.pow(2,30)]); assertFalse(has(o, 0), "delete 0"); assertFalse(has(o, Math.pow(2,30))); assertTrue(has(o, 1)); assertTrue(has(o, Math.pow(2,30)-1)); assertTrue(has(o, Math.pow(2,31)-1)); assertTrue(delete o[Math.pow(2,30)-1]); assertTrue(has(o, 1)); assertFalse(has(o, Math.pow(2,30)-1), "delete 2^30-1"); assertTrue(has(o, Math.pow(2,31)-1)); assertTrue(delete o[1]); assertFalse(has(o, 1), "delete 1"); assertFalse(has(o, Math.pow(2,30)-1), "delete 2^30-1"); assertTrue(has(o, Math.pow(2,31)-1)); assertTrue(delete o[Math.pow(2,31)-1]); assertFalse(has(o, 1), "delete 1"); assertFalse(has(o, Math.pow(2,30)-1), "delete 2^30-1"); assertFalse(has(o, Math.pow(2,31)-1), "delete 2^31-1"); var a = []; a[Math.pow(2,30)-1] = 0; a[Math.pow(2,31)-1] = 0; a[1] = 0; assertTrue(delete a[0]); assertTrue(delete a[Math.pow(2,30)]); assertFalse(has(a, 0), "delete 0"); assertFalse(has(a, Math.pow(2,30)), "delete 2^30"); assertTrue(has(a, 1)); assertTrue(has(a, Math.pow(2,30)-1)); assertTrue(has(a, Math.pow(2,31)-1)); assertEquals(Math.pow(2,31), a.length); assertTrue(delete a[Math.pow(2,30)-1]); assertTrue(has(a, 1)); assertFalse(has(a, Math.pow(2,30)-1), "delete 2^30-1"); assertTrue(has(a, Math.pow(2,31)-1)); assertEquals(Math.pow(2,31), a.length); assertTrue(delete a[1]); assertFalse(has(a, 1), "delete 1"); assertFalse(has(a, Math.pow(2,30)-1), "delete 2^30-1"); assertTrue(has(a, Math.pow(2,31)-1)); assertEquals(Math.pow(2,31), a.length); assertTrue(delete a[Math.pow(2,31)-1]); assertFalse(has(a, 1), "delete 1"); assertFalse(has(a, Math.pow(2,30)-1), "delete 2^30-1"); assertFalse(has(a, Math.pow(2,31)-1), "delete 2^31-1"); assertEquals(Math.pow(2,31), a.length); // Check that a LoadIC for a dictionary field works, even // when the dictionary probe misses. function load_deleted_property_using_IC() { var x = new Object(); x.a = 3; x.b = 4; x.c = 5; delete x.c; assertEquals(3, load_a(x)); assertEquals(3, load_a(x)); delete x.a; assertTrue(typeof load_a(x) === 'undefined', "x.a is gone"); assertTrue(typeof load_a(x) === 'undefined', "x.a is gone"); } function load_a(x) { return x.a; } load_deleted_property_using_IC();