builtins/StringConstructor.js

   1 /*
   2  * Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 function raw(template) {
  27     "use strict";
  28
  29     if (template === null || template === undefined)
  30         throw new @TypeError("String.raw requires template not be null or undefined");
  31     var cookedSegments = @Object(template);
  32
  33     var rawValue = cookedSegments.raw;
  34     if (rawValue === null || rawValue === undefined)
  35         throw new @TypeError("String.raw requires template.raw not be null or undefined");
  36     var rawSegments = @Object(rawValue);
  37
  38     var numberOfSubstitutions = arguments.length - 1;
  39
  40     var segmentCount = @toLength(rawSegments.length);
  41
  42     if (segmentCount <= 0)
  43         return '';
  44
  45     var stringElements = '';
  46     for (var i = 0; ; ++i) {
  47         var segment = @toString(rawSegments[i]);
  48         stringElements += segment;
  49
  50         if ((i + 1) === segmentCount)
  51             return stringElements;
  52
  53         if (i < numberOfSubstitutions) {
  54             var substitutionIndexInArguments = i + 1;
  55             var next = @toString(arguments[substitutionIndexInArguments]);
  56             stringElements += next;
  57         }
  58     }
  59 }