js/src/tests/ecma/TypeConversion/9.7.js

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  38
  39
  40 /**
  41    File Name:          9.7.js
  42    ECMA Section:       9.7  Type Conversion:  ToInt16
  43    Description:        rules for converting an argument to an unsigned
  44    16 bit integer in the range 0 to 2^16-1.
  45
  46    this test uses String.prototype.fromCharCode() and
  47    String.prototype.charCodeAt() to test ToInt16.
  48
  49    special cases:
  50    -0          returns 0
  51    Infinity    returns 0
  52    -Infinity   returns 0
  53    0           returns 0
  54
  55    Author:             christine@netscape.com
  56    Date:               17 july 1997
  57 */
  58 var SECTION = "9.7";
  59 var VERSION = "ECMA_1";
  60 startTest();
  61
  62 writeHeaderToLog( SECTION + " Type Conversion:  ToInt16");
  63
  64 /*
  65   new TestCase( "9.7",   "String.fromCharCode(0).charCodeAt(0)",          0,      String.fromCharCode(0).charCodeAt(0) );
  66   new TestCase( "9.7",   "String.fromCharCode(-0).charCodeAt(0)",         0,      String.fromCharCode(-0).charCodeAt(0) );
  67   new TestCase( "9.7",   "String.fromCharCode(1).charCodeAt(0)",          1,      String.fromCharCode(1).charCodeAt(0) );
  68   new TestCase( "9.7",   "String.fromCharCode(64).charCodeAt(0)",         64,     String.fromCharCode(64).charCodeAt(0) );
  69   new TestCase( "9.7",   "String.fromCharCode(126).charCodeAt(0)",        126,    String.fromCharCode(126).charCodeAt(0) );
  70   new TestCase( "9.7",   "String.fromCharCode(127).charCodeAt(0)",        127,    String.fromCharCode(127).charCodeAt(0) );
  71   new TestCase( "9.7",   "String.fromCharCode(128).charCodeAt(0)",        128,    String.fromCharCode(128).charCodeAt(0) );
  72   new TestCase( "9.7",   "String.fromCharCode(130).charCodeAt(0)",        130,    String.fromCharCode(130).charCodeAt(0) );
  73   new TestCase( "9.7",   "String.fromCharCode(255).charCodeAt(0)",        255,    String.fromCharCode(255).charCodeAt(0) );
  74   new TestCase( "9.7",   "String.fromCharCode(256).charCodeAt(0)",        256,    String.fromCharCode(256).charCodeAt(0) );
  75   new TestCase( "9.7",   "String.fromCharCode(Math.pow(2,16)-1).charCodeAt(0)",   65535,  String.fromCharCode(Math.pow(2,16)-1).charCodeAt(0) );
  76   new TestCase( "9.7",   "String.fromCharCode(Math.pow(2,16)).charCodeAt(0)",     0,      String.fromCharCode(Math.pow(2,16)).charCodeAt(0) );
  77 */
  78
  79
  80 new TestCase( "9.7",   "String.fromCharCode(0).charCodeAt(0)",          ToInt16(0),      String.fromCharCode(0).charCodeAt(0) );
  81 new TestCase( "9.7",   "String.fromCharCode(-0).charCodeAt(0)",         ToInt16(0),      String.fromCharCode(-0).charCodeAt(0) );
  82 new TestCase( "9.7",   "String.fromCharCode(1).charCodeAt(0)",          ToInt16(1),      String.fromCharCode(1).charCodeAt(0) );
  83 new TestCase( "9.7",   "String.fromCharCode(64).charCodeAt(0)",         ToInt16(64),     String.fromCharCode(64).charCodeAt(0) );
  84 new TestCase( "9.7",   "String.fromCharCode(126).charCodeAt(0)",        ToInt16(126),    String.fromCharCode(126).charCodeAt(0) );
  85 new TestCase( "9.7",   "String.fromCharCode(127).charCodeAt(0)",        ToInt16(127),    String.fromCharCode(127).charCodeAt(0) );
  86 new TestCase( "9.7",   "String.fromCharCode(128).charCodeAt(0)",        ToInt16(128),    String.fromCharCode(128).charCodeAt(0) );
  87 new TestCase( "9.7",   "String.fromCharCode(130).charCodeAt(0)",        ToInt16(130),    String.fromCharCode(130).charCodeAt(0) );
  88 new TestCase( "9.7",   "String.fromCharCode(255).charCodeAt(0)",        ToInt16(255),    String.fromCharCode(255).charCodeAt(0) );
  89 new TestCase( "9.7",   "String.fromCharCode(256).charCodeAt(0)",        ToInt16(256),    String.fromCharCode(256).charCodeAt(0) );
  90
  91 new TestCase( "9.7",   "String.fromCharCode(Math.pow(2,16)-1).charCodeAt(0)",   65535,  String.fromCharCode(Math.pow(2,16)-1).charCodeAt(0) );
  92 new TestCase( "9.7",   "String.fromCharCode(Math.pow(2,16)).charCodeAt(0)",     0,      String.fromCharCode(Math.pow(2,16)).charCodeAt(0) );
  93
  94 new TestCase( "9.7",   "String.fromCharCode(65535).charCodeAt(0)",     ToInt16(65535),      String.fromCharCode(65535).charCodeAt(0) );
  95 new TestCase( "9.7",   "String.fromCharCode(65536).charCodeAt(0)",     ToInt16(65536),      String.fromCharCode(65536).charCodeAt(0) );
  96 new TestCase( "9.7",   "String.fromCharCode(65537).charCodeAt(0)",     ToInt16(65537),      String.fromCharCode(65537).charCodeAt(0) );
  97
  98 new TestCase( "9.7",   "String.fromCharCode(131071).charCodeAt(0)",     ToInt16(131071),    String.fromCharCode(131071).charCodeAt(0) );
  99 new TestCase( "9.7",   "String.fromCharCode(131072).charCodeAt(0)",     ToInt16(131072),    String.fromCharCode(131072).charCodeAt(0) );
 100 new TestCase( "9.7",   "String.fromCharCode(131073).charCodeAt(0)",     ToInt16(131073),    String.fromCharCode(131073).charCodeAt(0) );
 101
 102 new TestCase( "9.7",   "String.fromCharCode('65535').charCodeAt(0)",     65535,             String.fromCharCode("65535").charCodeAt(0) );
 103 new TestCase( "9.7",   "String.fromCharCode('65536').charCodeAt(0)",     0,                 String.fromCharCode("65536").charCodeAt(0) );
 104
 105 new TestCase( "9.7",   "String.fromCharCode(-1).charCodeAt(0)",         ToInt16(-1),        String.fromCharCode(-1).charCodeAt(0) );
 106 new TestCase( "9.7",   "String.fromCharCode(-64).charCodeAt(0)",        ToInt16(-64),       String.fromCharCode(-64).charCodeAt(0) );
 107 new TestCase( "9.7",   "String.fromCharCode(-126).charCodeAt(0)",       ToInt16(-126),      String.fromCharCode(-126).charCodeAt(0) );
 108 new TestCase( "9.7",   "String.fromCharCode(-127).charCodeAt(0)",       ToInt16(-127),      String.fromCharCode(-127).charCodeAt(0) );
 109 new TestCase( "9.7",   "String.fromCharCode(-128).charCodeAt(0)",       ToInt16(-128),      String.fromCharCode(-128).charCodeAt(0) );
 110 new TestCase( "9.7",   "String.fromCharCode(-130).charCodeAt(0)",       ToInt16(-130),      String.fromCharCode(-130).charCodeAt(0) );
 111 new TestCase( "9.7",   "String.fromCharCode(-255).charCodeAt(0)",       ToInt16(-255),      String.fromCharCode(-255).charCodeAt(0) );
 112 new TestCase( "9.7",   "String.fromCharCode(-256).charCodeAt(0)",       ToInt16(-256),      String.fromCharCode(-256).charCodeAt(0) );
 113
 114 new TestCase( "9.7",   "String.fromCharCode(-Math.pow(2,16)-1).charCodeAt(0)",   65535,     String.fromCharCode(-Math.pow(2,16)-1).charCodeAt(0) );
 115 new TestCase( "9.7",   "String.fromCharCode(-Math.pow(2,16)).charCodeAt(0)",     0,         String.fromCharCode(-Math.pow(2,16)).charCodeAt(0) );
 116
 117 new TestCase( "9.7",   "String.fromCharCode(-65535).charCodeAt(0)",     ToInt16(-65535),    String.fromCharCode(-65535).charCodeAt(0) );
 118 new TestCase( "9.7",   "String.fromCharCode(-65536).charCodeAt(0)",     ToInt16(-65536),    String.fromCharCode(-65536).charCodeAt(0) );
 119 new TestCase( "9.7",   "String.fromCharCode(-65537).charCodeAt(0)",     ToInt16(-65537),    String.fromCharCode(-65537).charCodeAt(0) );
 120
 121 new TestCase( "9.7",   "String.fromCharCode(-131071).charCodeAt(0)",    ToInt16(-131071),   String.fromCharCode(-131071).charCodeAt(0) );
 122 new TestCase( "9.7",   "String.fromCharCode(-131072).charCodeAt(0)",    ToInt16(-131072),   String.fromCharCode(-131072).charCodeAt(0) );
 123 new TestCase( "9.7",   "String.fromCharCode(-131073).charCodeAt(0)",    ToInt16(-131073),   String.fromCharCode(-131073).charCodeAt(0) );
 124
 125 new TestCase( "9.7",   "String.fromCharCode('-65535').charCodeAt(0)",   ToInt16(-65535),    String.fromCharCode("-65535").charCodeAt(0) );
 126 new TestCase( "9.7",   "String.fromCharCode('-65536').charCodeAt(0)",   ToInt16(-65536),    String.fromCharCode("-65536").charCodeAt(0) );
 127
 128
 129 //    new TestCase( "9.7",   "String.fromCharCode(2147483648).charCodeAt(0)", ToInt16(2147483648),      String.fromCharCode(2147483648).charCodeAt(0) );
 130
 131
 132
 133 //    the following test cases cause a runtime error.  see:  http://scopus.mcom.com/bugsplat/show_bug.cgi?id=78878
 134
 135 //    new TestCase( "9.7",   "String.fromCharCode(Infinity).charCodeAt(0)",           0,      String.fromCharCode("Infinity").charCodeAt(0) );
 136 //    new TestCase( "9.7",   "String.fromCharCode(-Infinity).charCodeAt(0)",          0,      String.fromCharCode("-Infinity").charCodeAt(0) );
 137 //    new TestCase( "9.7",   "String.fromCharCode(NaN).charCodeAt(0)",                0,      String.fromCharCode(Number.NaN).charCodeAt(0) );
 138 //    new TestCase( "9.7",   "String.fromCharCode(Number.POSITIVE_INFINITY).charCodeAt(0)",   0,  String.fromCharCode(Number.POSITIVE_INFINITY).charCodeAt(0) );
 139 //    new TestCase( "9.7",   "String.fromCharCode(Number.NEGATIVE_INFINITY).charCodeAt(0)",   0,  String.fromCharCode(Number.NEGATIVE_INFINITY).charCodeAt(0) );
 140
 141 test();
 142
 143 function ToInt16( num ) {
 144   num = Number( num );
 145   if ( isNaN( num ) || num == 0 || num == Number.POSITIVE_INFINITY || num == Number.NEGATIVE_INFINITY ) {
 146     return 0;
 147   }
 148
 149   var sign = ( num < 0 ) ? -1 : 1;
 150
 151   num = sign * Math.floor( Math.abs( num ) );
 152
 153   num = num % Math.pow(2,16);
 154
 155   num = ( num > -65536 && num < 0) ? 65536 + num : num;
 156
 157   return num;
 158 }
 159