tests/stress/string-iterators.js

   1 // This test checks the behavior of the String iterator
   2
   3 var testString = "Cocoa,Cappuccino";
   4 var stringIterator = testString[Symbol.iterator]();
   5 var stringIteratorPrototype = stringIterator.__proto__;
   6 var stringIteratorPrototypeNext = stringIteratorPrototype.next;
   7
   8 if (stringIterator.hasOwnProperty('next'))
   9     throw "next method should exists on %StringIteratorPrototype%";
  10 if (!stringIteratorPrototype.hasOwnProperty('next'))
  11     throw "next method should exists on %StringIteratorPrototype%";
  12
  13 var iterator = testString[Symbol.iterator]();
  14 var i = 0;
  15 while (true) {
  16     var {done, value} = iterator.next();
  17     if (done)
  18         break;
  19     if (value !== testString[i])
  20         throw "Error: bad value: " + value;
  21     i++;
  22 }
  23
  24 if (testString.length !== i)
  25     throw "Error: bad value: " + i;
  26
  27 function testSurrogatePair(testString, expected, numberOfElements) {
  28     if (testString.length !== numberOfElements)
  29         throw "Error: bad value: " + testString.length;
  30
  31     var iterator = testString[Symbol.iterator]();
  32     var i = 0;
  33     while (true) {
  34         var {done, value} = iterator.next();
  35         if (done)
  36             break;
  37         if (value !== expected[i])
  38             throw "Error: bad value: " + value;
  39         i++;
  40     }
  41
  42     if (i !== expected.length)
  43         throw "Error: bad value: " + i;
  44
  45     for (var codePoint of testString) {
  46         if (value !== expected[i])
  47             throw "Error: bad value: " + value;
  48     }
  49 }
  50
  51 // "\uD842\uDFB7\u91ce\u5bb6"
  52 var testString = "𠮷野家";
  53 var expected = [
  54     String.fromCharCode(0xD842, 0xDFB7),
  55     String.fromCharCode(0x91CE),
  56     String.fromCharCode(0x5BB6),
  57 ];
  58 testSurrogatePair(testString, expected, 4);
  59
  60 var testString = "A\uD842";
  61 var expected = [
  62     String.fromCharCode(0x0041),
  63     String.fromCharCode(0xD842),
  64 ];
  65 testSurrogatePair(testString, expected, 2);
  66
  67 var testString = "A\uD842A";
  68 var expected = [
  69     String.fromCharCode(0x0041),
  70     String.fromCharCode(0xD842),
  71     String.fromCharCode(0x0041),
  72 ];
  73 testSurrogatePair(testString, expected, 3);
  74
  75 var testString = "A\uD842\uDFB7";
  76 var expected = [
  77     String.fromCharCode(0x0041),
  78     String.fromCharCode(0xD842, 0xDFB7),
  79 ];
  80 testSurrogatePair(testString, expected, 3);
  81
  82 var testString = "\uD842A\uDFB7";
  83 var expected = [
  84     String.fromCharCode(0xD842),
  85     String.fromCharCode(0x0041),
  86     String.fromCharCode(0xDFB7),
  87 ];
  88 testSurrogatePair(testString, expected, 3);
  89
  90 var testString = "\uDFB7\uD842A";
  91 var expected = [
  92     String.fromCharCode(0xDFB7),
  93     String.fromCharCode(0xD842),
  94     String.fromCharCode(0x0041),
  95 ];
  96 testSurrogatePair(testString, expected, 3);
  97
  98 var string1 = "Cocoa";
  99 var string1Iterator = string1[Symbol.iterator]();
 100 var index = 0;
 101 while (true) {
 102     var result = stringIteratorPrototypeNext.call(string1Iterator);
 103     var value = result.value;
 104     if (result.done) {
 105         break;
 106     }
 107     if (value !== string1[index++])
 108         throw "Error: bad value: " + value;
 109 }
 110 if (index !== 5)
 111     throw "Error: bad index: " + index;
 112
 113 function increment(iter) {
 114     return stringIteratorPrototypeNext.call(iter);
 115 }
 116 var string1 = "Cocoa";
 117 var string2 = "Cocoa";
 118 var string1Iterator = string1[Symbol.iterator]();
 119 var string2Iterator = string2[Symbol.iterator]();
 120 for (var i = 0; i < 3; ++i) {
 121     var value1 = increment(string1Iterator).value;
 122     var value2 = increment(string2Iterator).value;
 123     if (value1 !== value2)
 124         throw "Error: bad value: " + value1 + " " + value2;
 125 }
 126
 127 var string1 = "Cappuccino";
 128 var string1Iterator = string1[Symbol.iterator]();
 129
 130 var value = string1Iterator.next().value;
 131 if (value !== "C")
 132     throw "Error: bad value: " + value;
 133 var value = string1Iterator.next().value;
 134 if (value !== "a")
 135     throw "Error: bad value: " + value;
 136 var value = string1Iterator.next().value;
 137 if (value !== "p")
 138     throw "Error: bad value: " + value;
 139 var value = stringIteratorPrototypeNext.call(string1Iterator).value;
 140 if (value !== "p")
 141     throw "Error: bad value: " + value;
 142 var value = stringIteratorPrototypeNext.call(string1Iterator).value;
 143 if (value !== "u")
 144     throw "Error: bad value: " + value;
 145 var value = stringIteratorPrototypeNext.call(string1Iterator).value;
 146 if (value !== "c")
 147     throw "Error: bad value: " + value;
 148 var value = stringIteratorPrototypeNext.call(string1Iterator).value;
 149 if (value !== "c")
 150     throw "Error: bad value: " + value;
 151 var value = stringIteratorPrototypeNext.call(string1Iterator).value;
 152 if (value !== "i")
 153     throw "Error: bad value: " + value;
 154 var value = stringIteratorPrototypeNext.call(string1Iterator).value;
 155 if (value !== "n")
 156     throw "Error: bad value: " + value;
 157 var value = stringIteratorPrototypeNext.call(string1Iterator).value;
 158 if (value !== "o")
 159     throw "Error: bad value: " + value;
 160 var value = stringIteratorPrototypeNext.call(string1Iterator).value;
 161 if (value !== undefined)
 162     throw "Error: bad value: " + value;
 163
 164 var primitives = [
 165     "string",
 166     42,
 167     0.03,
 168     false,
 169     true,
 170     Symbol("Cocoa"),
 171     null,
 172     undefined
 173 ];
 174 for (var primitive of primitives) {
 175     var didThrow = null;
 176     try {
 177         stringIteratorPrototypeNext.call(primitive);
 178     } catch (e) {
 179         didThrow = e;
 180     }
 181     if (!didThrow)
 182         throw "Error: no error thrown";
 183     var message = 'TypeError: %StringIteratorPrototype%.next requires that |this| be a String Iterator instance';
 184     if (primitive == null)
 185         message = 'TypeError: %StringIteratorPrototype%.next requires that |this| not be null or undefined'
 186     if (String(didThrow) !== message)
 187         throw "Error: bad error thrown: " + didThrow;
 188 }
 189
 190 var nonRelatedObjects = [
 191     {},
 192     [],
 193     new Date(),
 194     new Error(),
 195     Object(Symbol()),
 196     new String("Cappuccino"),
 197     new Number(42),
 198     new Boolean(false),
 199     function () { },
 200 ];
 201 for (var object of nonRelatedObjects) {
 202     var didThrow = null;
 203     try {
 204         stringIteratorPrototypeNext.call(object);
 205     } catch (e) {
 206         didThrow = e;
 207     }
 208     if (!didThrow)
 209         throw "Error: no error thrown";
 210     if (String(didThrow) !== 'TypeError: %StringIteratorPrototype%.next requires that |this| be a String Iterator instance')
 211         throw "Error: bad error thrown: " + didThrow;
 212 }