third_party/WebKit/LayoutTests/fast/js/script-tests/reserved-words-as-property.js

   1 description("Tests to ensure that we can use ES reserved words as property names.");
   2
   3 var reservedWords = ["true", "false", "null", "break", "case", "catch", "continue", "debugger", "default", "delete", "do", "else", "finally", "for",
   4                      "function", "if", "in", "instanceof", "new", "return", "switch", "this", "throw", "try", "typeof", "var", "void", "while", "with",
   5                      "class", "const", "enum", "export", "extends", "import", "super"];
   6
   7 var strictReservedWords = [
   8     "implements",
   9     "let",
  10     "private",
  11     "public",
  12     "yield",
  13     "interface",
  14     "package",
  15     "protected",
  16     "static"
  17 ];
  18
  19 var unreservedWords = [
  20     "abstract",
  21     "boolean",
  22     "byte",
  23     "char",
  24     "double",
  25     "final",
  26     "float",
  27     "goto",
  28     "int",
  29     "long",
  30     "native",
  31     "short",
  32     "synchronized",
  33     "throws",
  34     "transient",
  35     "volatile"
  36 ];
  37
  38
  39 function testWordEvalAndFunction(str, strShouldThrow) {
  40     if (strShouldThrow) {
  41         shouldThrow(str);
  42         shouldThrow("(function(){"+str+"}); true");
  43     } else {
  44         shouldBeTrue(str);
  45         shouldBeTrue("(function(){"+str+"}); true");
  46     }
  47 }
  48
  49 function testWord(word, strictPrefix, expectedResult) {
  50     testWordEvalAndFunction(strictPrefix + "var " + word + "; true", expectedResult);
  51     testWordEvalAndFunction(strictPrefix + "var " + word + " = 42; " + word + " === 42", expectedResult);
  52     testWordEvalAndFunction(strictPrefix + "function g(" + word + "){ " + strictPrefix + " }; true", expectedResult);
  53     testWordEvalAndFunction(strictPrefix + "/" + word + "/.test(function g(" + word + "){ " + strictPrefix + " })", expectedResult);
  54     testWordEvalAndFunction(strictPrefix + "try{}catch(" + word + "){}; true", expectedResult);
  55     testWordEvalAndFunction(strictPrefix + "function " + word + "(){ " + strictPrefix + " }; true", expectedResult);
  56     // These should be allowed for all words, even reserved ones.
  57     testWordEvalAndFunction(strictPrefix + "({ \"" + word + "\": 42 }." + word + " === 42)", false);
  58     testWordEvalAndFunction(strictPrefix + "({ " + word + ": 42 }." + word + " === 42)", false);
  59     testWordEvalAndFunction(strictPrefix + "({ get " + word + "(){}, set " + word + "(_){}, parsedOkay: 42 }.parsedOkay === 42)", false);
  60 }
  61
  62 function testWordStrictAndNonStrict(word, condition) {
  63     testWord(word, '', condition == "keyword");
  64     testWord(word, '"use strict";', condition != "identifier");
  65 }
  66
  67 for (var i = 0; i < reservedWords.length; i++)
  68     testWordStrictAndNonStrict(reservedWords[i], "keyword");
  69 for (var i = 0; i < strictReservedWords.length; i++)
  70     testWordStrictAndNonStrict(strictReservedWords[i], "strict");
  71 for (var i = 0; i < unreservedWords.length; i++)
  72     testWordStrictAndNonStrict(unreservedWords[i], "identifier");
  73
  74 // test access via window.
  75 var yield = 42;
  76 shouldBeTrue("window.yield === 42");