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| 1 // Copyright 2014 the V8 project authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 // Flags: --harmony-rest-parameters |
| 6 |
| 7 (function testRestIndex() { |
| 8 assertEquals(5, (function(...args) { return args.length; })(1,2,3,4,5)); |
| 9 assertEquals(4, (function(a, ...args) { return args.length; })(1,2,3,4,5)); |
| 10 assertEquals(3, (function(a, b, ...args) { return args.length; })(1,2,3,4,5)); |
| 11 assertEquals(2, (function(a, b, c, ...args) { |
| 12 return args.length; })(1,2,3,4,5)); |
| 13 assertEquals(1, (function(a, b, c, d, ...args) { |
| 14 return args.length; })(1,2,3,4,5)); |
| 15 assertEquals(0, (function(a, b, c, d, e, ...args) { |
| 16 return args.length; })(1,2,3,4,5)); |
| 17 })(); |
| 18 |
| 19 function strictTest(a, b, ...c) { |
| 20 "use strict"; |
| 21 assertEquals(Array, c.constructor); |
| 22 assertTrue(Array.isArray(c)); |
| 23 |
| 24 var expectedLength = arguments.length >= 3 ? arguments.length - 2 : 0; |
| 25 assertEquals(expectedLength, c.length); |
| 26 |
| 27 for (var i = 2, j = 0; i < arguments.length; ++i) { |
| 28 assertEquals(c[j++], arguments[i]); |
| 29 } |
| 30 } |
| 31 |
| 32 function sloppyTest(a, b, ...c) { |
| 33 assertEquals(Array, c.constructor); |
| 34 assertTrue(Array.isArray(c)); |
| 35 |
| 36 var expectedLength = arguments.length >= 3 ? arguments.length - 2 : 0; |
| 37 assertEquals(expectedLength, c.length); |
| 38 |
| 39 for (var i = 2, j = 0; i < arguments.length; ++i) { |
| 40 assertEquals(c[j++], arguments[i]); |
| 41 } |
| 42 } |
| 43 |
| 44 |
| 45 var O = { |
| 46 strict: strictTest, |
| 47 sloppy: sloppyTest |
| 48 }; |
| 49 |
| 50 (function testStrictRestParamArity() { |
| 51 assertEquals(2, strictTest.length); |
| 52 assertEquals(2, O.strict.length); |
| 53 })(); |
| 54 |
| 55 |
| 56 (function testRestParamsStrictMode() { |
| 57 strictTest(); |
| 58 strictTest(1, 2); |
| 59 strictTest(1, 2, 3, 4, 5, 6); |
| 60 strictTest(1, 2, 3); |
| 61 O.strict(); |
| 62 O.strict(1, 2); |
| 63 O.strict(1, 2, 3, 4, 5, 6); |
| 64 O.strict(1, 2, 3); |
| 65 })(); |
| 66 |
| 67 |
| 68 (function testRestParamsStrictModeApply() { |
| 69 strictTest.apply(null, []); |
| 70 strictTest.apply(null, [1, 2]); |
| 71 strictTest.apply(null, [1, 2, 3, 4, 5, 6]); |
| 72 strictTest.apply(null, [1, 2, 3]); |
| 73 O.strict.apply(O, []); |
| 74 O.strict.apply(O, [1, 2]); |
| 75 O.strict.apply(O, [1, 2, 3, 4, 5, 6]); |
| 76 O.strict.apply(O, [1, 2, 3]); |
| 77 })(); |
| 78 |
| 79 |
| 80 (function testRestParamsStrictModeCall() { |
| 81 strictTest.call(null); |
| 82 strictTest.call(null, 1, 2); |
| 83 strictTest.call(null, 1, 2, 3, 4, 5, 6); |
| 84 strictTest.call(null, 1, 2, 3); |
| 85 O.strict.call(O); |
| 86 O.strict.call(O, 1, 2); |
| 87 O.strict.call(O, 1, 2, 3, 4, 5, 6); |
| 88 O.strict.call(O, 1, 2, 3); |
| 89 })(); |
| 90 |
| 91 |
| 92 (function testsloppyRestParamArity() { |
| 93 assertEquals(2, sloppyTest.length); |
| 94 assertEquals(2, O.sloppy.length); |
| 95 })(); |
| 96 |
| 97 |
| 98 (function testRestParamssloppyMode() { |
| 99 sloppyTest(); |
| 100 sloppyTest(1, 2); |
| 101 sloppyTest(1, 2, 3, 4, 5, 6); |
| 102 sloppyTest(1, 2, 3); |
| 103 O.sloppy(); |
| 104 O.sloppy(1, 2); |
| 105 O.sloppy(1, 2, 3, 4, 5, 6); |
| 106 O.sloppy(1, 2, 3); |
| 107 })(); |
| 108 |
| 109 |
| 110 (function testRestParamssloppyModeApply() { |
| 111 sloppyTest.apply(null, []); |
| 112 sloppyTest.apply(null, [1, 2]); |
| 113 sloppyTest.apply(null, [1, 2, 3, 4, 5, 6]); |
| 114 sloppyTest.apply(null, [1, 2, 3]); |
| 115 O.sloppy.apply(O, []); |
| 116 O.sloppy.apply(O, [1, 2]); |
| 117 O.sloppy.apply(O, [1, 2, 3, 4, 5, 6]); |
| 118 O.sloppy.apply(O, [1, 2, 3]); |
| 119 })(); |
| 120 |
| 121 |
| 122 (function testRestParamssloppyModeCall() { |
| 123 sloppyTest.call(null); |
| 124 sloppyTest.call(null, 1, 2); |
| 125 sloppyTest.call(null, 1, 2, 3, 4, 5, 6); |
| 126 sloppyTest.call(null, 1, 2, 3); |
| 127 O.sloppy.call(O); |
| 128 O.sloppy.call(O, 1, 2); |
| 129 O.sloppy.call(O, 1, 2, 3, 4, 5, 6); |
| 130 O.sloppy.call(O, 1, 2, 3); |
| 131 })(); |
| 132 |
| 133 |
| 134 (function testUnmappedArguments() { |
| 135 // Strict/Unmapped arguments should always be used for functions with rest |
| 136 // parameters |
| 137 assertThrows(function(...rest) { return arguments.caller; }, TypeError); |
| 138 assertThrows(function(...rest) { return arguments.callee; }, TypeError); |
| 139 // TODO(caitp): figure out why this doesn't throw sometimes, even though the |
| 140 // getter always does =) |
| 141 // assertThrows(function(...rest) { arguments.caller = 1; }, TypeError); |
| 142 // assertThrows(function(...rest) { arguments.callee = 1; }, TypeError); |
| 143 })(); |
| 144 |
| 145 |
| 146 (function testNoAliasArgumentsStrict() { |
| 147 function strictF(a, ...rest) { |
| 148 "use strict"; |
| 149 arguments[0] = 1; |
| 150 assertEquals(3, a); |
| 151 arguments[1] = 2; |
| 152 assertArrayEquals([4, 5], rest); |
| 153 } |
| 154 strictF(3, 4, 5); |
| 155 })(); |
| 156 |
| 157 |
| 158 (function testNoAliasArgumentsSloppy() { |
| 159 function sloppyF(a, ...rest) { |
| 160 arguments[0] = 1; |
| 161 assertEquals(3, a); |
| 162 arguments[1] = 2; |
| 163 assertArrayEquals([4, 5], rest); |
| 164 } |
| 165 sloppyF(3, 4, 5); |
| 166 })(); |
| 167 |
| 168 |
| 169 /* TODO(caitp): support arrow functions (blocked on spread operator support) |
| 170 (function testRestParamsArrowFunctions() { |
| 171 "use strict"; |
| 172 |
| 173 var fn = (a, b, ...c) => c; |
| 174 assertEquals([], fn()); |
| 175 assertEquals([], fn(1, 2)); |
| 176 assertEquals([3], fn(1, 2, 3)); |
| 177 assertEquals([3, 4], fn(1, 2, 3, 4)); |
| 178 assertEquals([3, 4, 5], fn(1, 2, 3, 4, 5)); |
| 179 assertThrows("var x = ...y => y;", SyntaxError); |
| 180 assertEquals([], ((...args) => args)()); |
| 181 assertEquals([1,2,3], ((...args) => args)(1,2,3)); |
| 182 })();*/ |
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