tests/stress/trailing-comma-in-patterns.js

   1 function shouldBe(actual, expected) {
   2     if (actual !== expected)
   3         throw new Error('bad value: ' + actual);
   4 }
   5
   6 function iterator(array) {
   7     var nextCount = 0;
   8     var returnCount = 0;
   9     var original =  array.values();
  10     return {
  11         [Symbol.iterator]() {
  12             return this;
  13         },
  14
  15         next() {
  16             ++nextCount;
  17             return original.next();
  18         },
  19
  20         return() {
  21             ++returnCount;
  22             return { done: true };
  23         },
  24
  25         reportNext() {
  26             return nextCount;
  27         },
  28
  29         reportReturn() {
  30             return returnCount;
  31         }
  32     };
  33 };
  34
  35 (function () {
  36     var iter = iterator([1, 2, 3]);
  37     var [] = iter;
  38     shouldBe(iter.reportNext(), 0);
  39     shouldBe(iter.reportReturn(), 1);
  40 }());
  41
  42 (function () {
  43     var iter = iterator([1, 2, 3]);
  44     var [,] = iter;
  45     shouldBe(iter.reportNext(), 1);
  46     shouldBe(iter.reportReturn(), 1);
  47 }());
  48
  49 (function () {
  50     var iter = iterator([1, 2, 3]);
  51     var [,,] = iter;
  52     shouldBe(iter.reportNext(), 2);
  53     shouldBe(iter.reportReturn(), 1);
  54 }());
  55
  56 (function () {
  57     var iter = iterator([1, 2, 3]);
  58     var [,,,] = iter;
  59     shouldBe(iter.reportNext(), 3);
  60     shouldBe(iter.reportReturn(), 1);
  61 }());
  62
  63 (function () {
  64     var iter = iterator([1, 2, 3]);
  65     var [,,,,] = iter;
  66     shouldBe(iter.reportNext(), 4);
  67     shouldBe(iter.reportReturn(), 0);
  68 }());
  69
  70 (function () {
  71     var iter = iterator([1, 2, 3]);
  72     var [,,,,,] = iter;
  73     shouldBe(iter.reportNext(), 4);
  74     shouldBe(iter.reportReturn(), 0);
  75 }());
  76
  77 (function () {
  78     var iter = iterator([1, 2, 3]);
  79     var [,a,] = iter;
  80     shouldBe(iter.reportNext(), 2);
  81     shouldBe(iter.reportReturn(), 1);
  82     shouldBe(a, 2);
  83 }());
  84
  85 (function () {
  86     var iter = iterator([1, 2, 3]);
  87     var [a,] = iter;
  88     shouldBe(iter.reportNext(), 1);
  89     shouldBe(iter.reportReturn(), 1);
  90     shouldBe(a, 1);
  91 }());
  92
  93 (function () {
  94     var iter = iterator([1, 2, 3]);
  95     var [a,,] = iter;
  96     shouldBe(iter.reportNext(), 2);
  97     shouldBe(iter.reportReturn(), 1);
  98     shouldBe(a, 1);
  99 }());
 100
 101 (function () {
 102     var iter = iterator([1, 2, 3]);
 103     var [a,b = 42,] = iter;
 104     shouldBe(iter.reportNext(), 2);
 105     shouldBe(iter.reportReturn(), 1);
 106     shouldBe(a, 1);
 107     shouldBe(b, 2);
 108 }());
 109
 110 (function () {
 111     var {} = { Cocoa: 15, Cappuccino: 13 };
 112 }());
 113
 114 (function () {
 115     var {Cocoa,} = { Cocoa: 15, Cappuccino: 13 };
 116     shouldBe(Cocoa, 15);
 117 }());
 118
 119 (function () {
 120     var {Cocoa = 'Cocoa',} = { Cocoa: 15, Cappuccino: 13 };
 121     shouldBe(Cocoa, 15);
 122 }());
 123
 124 (function () {
 125     var {Cocoa, Kilimanjaro = 'Coffee'} = { Cocoa: 15, Cappuccino: 13 };
 126     shouldBe(Cocoa, 15);
 127     shouldBe(Kilimanjaro, 'Coffee');
 128 }());
 129
 130 (function () {
 131     var {Cocoa, Kilimanjaro = 'Coffee'} = {};
 132     shouldBe(Cocoa, undefined);
 133     shouldBe(Kilimanjaro, 'Coffee');
 134 }());
 135
 136 (function () {
 137     var {Cocoa, Kilimanjaro = 'Coffee',} = { Cocoa: 15, Cappuccino: 13 };
 138     shouldBe(Cocoa, 15);
 139     shouldBe(Kilimanjaro, 'Coffee');
 140 }());
 141
 142 function testSyntaxError(script, message) {
 143     var error = null;
 144     try {
 145         eval(script);
 146     } catch (e) {
 147         error = e;
 148     }
 149     if (!error)
 150         throw new Error("Expected syntax error not thrown");
 151
 152     if (String(error) !== message)
 153         throw new Error("Bad error: " + String(error));
 154 }
 155
 156 testSyntaxError(String.raw`var {,} = {Cocoa: 15}`, String.raw`SyntaxError: Unexpected token ','. Expected a property name.`);
 157 testSyntaxError(String.raw`var {,} = {}`, String.raw`SyntaxError: Unexpected token ','. Expected a property name.`);