ager@chromium.org | 5f0c45f | 2010-12-17 08:51:21 +0000 | [diff] [blame] | 1 | // Copyright 2010 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 | // Test the ToPrimitive internal function used by ToNumber/ToString. |
| 29 | // Does it [[Get]] and [[Call]] the object's toString and valueOf properties |
| 30 | // correctly. Specifically, does it call [[Get]] only once per property. |
| 31 | |
| 32 | var o1 = { toString: function() { return 42; }, |
| 33 | valueOf: function() { return "37"; } }; |
| 34 | var n1 = Number(o1); |
| 35 | var s1 = String(o1); |
| 36 | assertTrue(typeof n1 == "number"); |
| 37 | assertTrue(typeof s1 == "string"); |
| 38 | |
| 39 | var trace = []; |
| 40 | var valueOfValue = 42; |
| 41 | var toStringValue = "foo"; |
| 42 | function traceValueOf () { |
| 43 | trace.push("vo"); |
| 44 | return valueOfValue; |
| 45 | }; |
| 46 | function traceToString() { |
| 47 | trace.push("ts"); |
| 48 | return toStringValue; |
| 49 | }; |
| 50 | var valueOfFunc = traceValueOf; |
| 51 | var toStringFunc = traceToString; |
| 52 | |
| 53 | var ot = { get toString() { trace.push("gts"); |
| 54 | return toStringFunc; }, |
| 55 | get valueOf() { trace.push("gvo"); |
| 56 | return valueOfFunc; } |
| 57 | }; |
| 58 | |
| 59 | var nt = Number(ot); |
| 60 | assertEquals(42, nt); |
| 61 | assertEquals(["gvo","vo"], trace); |
| 62 | |
| 63 | trace = []; |
| 64 | var st = String(ot); |
| 65 | assertEquals("foo", st); |
| 66 | assertEquals(["gts","ts"], trace); |
| 67 | |
| 68 | trace = []; |
| 69 | valueOfValue = ["not primitive"]; |
| 70 | var nt = Number(ot); |
| 71 | assertEquals(Number("foo"), nt); |
| 72 | assertEquals(["gvo", "vo", "gts", "ts"], trace); |
| 73 | |
| 74 | trace = []; |
| 75 | valueOfValue = 42; |
| 76 | toStringValue = ["not primitive"]; |
| 77 | var st = String(ot); |
| 78 | assertEquals(String(42), st); |
| 79 | assertEquals(["gts", "ts", "gvo", "vo"], trace); |
| 80 | |
| 81 | trace = []; |
| 82 | valueOfValue = ["not primitive"]; |
| 83 | assertThrows("Number(ot)", TypeError); |
| 84 | assertEquals(["gvo", "vo", "gts", "ts"], trace); |
| 85 | |
| 86 | |
| 87 | toStringFunc = "not callable"; |
| 88 | trace = []; |
| 89 | valueOfValue = 42; |
| 90 | var st = String(ot); |
| 91 | assertEquals(String(42), st); |
| 92 | assertEquals(["gts", "gvo", "vo"], trace); |
| 93 | |
| 94 | valueOfFunc = "not callable"; |
| 95 | trace = []; |
| 96 | assertThrows("String(ot)", TypeError); |
| 97 | assertEquals(["gts", "gvo"], trace); |
| 98 | |
| 99 | toStringFunc = traceToString; |
| 100 | toStringValue = "87"; |
| 101 | trace = []; |
| 102 | var nt = Number(ot); |
| 103 | assertEquals(87, nt); |
| 104 | assertEquals(["gvo", "gts", "ts"], trace); |