The Tor Browser / file comparison
comparison: js/src/tests/ecma_6/Generators/syntax.js
js/src/tests/ecma_6/Generators/syntax.js
- changeset 0
- 6474c204b198
equal
deleted
inserted
replaced
| -1:000000000000 | 0:9973ba3daa30 |
|---|---|
| 1 // This file was written by Andy Wingo <wingo@igalia.com> and originally | |
| 2 // contributed to V8 as generators-parsing.js, available here: | |
| 3 // | |
| 4 // http://code.google.com/p/v8/source/browse/branches/bleeding_edge/test/mjsunit/harmony/generators-parsing.js | |
| 5 | |
| 6 function assertSyntaxError(str) { | |
| 7 var msg; | |
| 8 var evil = eval; | |
| 9 try { | |
| 10 // Non-direct eval. | |
| 11 evil(str); | |
| 12 } catch (exc) { | |
| 13 if (exc instanceof SyntaxError) | |
| 14 return; | |
| 15 msg = "Assertion failed: expected SyntaxError, got " + exc; | |
| 16 } | |
| 17 if (msg === undefined) | |
| 18 msg = "Assertion failed: expected SyntaxError, but no exception thrown"; | |
| 19 throw new Error(msg + " - " + str); | |
| 20 } | |
| 21 | |
| 22 // Yield statements. | |
| 23 function* g() { yield 3; yield 4; } | |
| 24 | |
| 25 // Yield expressions. | |
| 26 function* g() { (yield 3) + (yield 4); } | |
| 27 | |
| 28 // You can have a generator in strict mode. | |
| 29 function* g() { "use strict"; yield 3; yield 4; } | |
| 30 | |
| 31 // Generators can have return statements also, which internally parse to a kind | |
| 32 // of yield expression. | |
| 33 function* g() { yield 1; return; } | |
| 34 function* g() { yield 1; return 2; } | |
| 35 function* g() { yield 1; return 2; yield "dead"; } | |
| 36 | |
| 37 // Generator expression. | |
| 38 (function* () { yield 3; }); | |
| 39 | |
| 40 // Named generator expression. | |
| 41 (function* g() { yield 3; }); | |
| 42 | |
| 43 // Generators do not have to contain yield expressions. | |
| 44 function* g() { } | |
| 45 | |
| 46 // YieldExpressions can occur in the RHS of a YieldExpression. | |
| 47 function* g() { yield yield 1; } | |
| 48 function* g() { yield 3 + (yield 4); } | |
| 49 | |
| 50 // Generator definitions with a name of "yield" are not specifically ruled out | |
| 51 // by the spec, as the `yield' name is outside the generator itself. However, | |
| 52 // in strict-mode, "yield" is an invalid identifier. | |
| 53 function* yield() { (yield 3) + (yield 4); } | |
| 54 assertSyntaxError("function* yield() { 'use strict'; (yield 3) + (yield 4); }"); | |
| 55 | |
| 56 // In classic mode, yield is a normal identifier, outside of generators. | |
| 57 function yield(yield) { yield: yield (yield + yield (0)); } | |
| 58 | |
| 59 // Yield is always valid as a key in an object literal. | |
| 60 ({ yield: 1 }); | |
| 61 function* g() { yield ({ yield: 1 }) } | |
| 62 function* g() { yield ({ get yield() { return 1; }}) } | |
| 63 | |
| 64 // Yield is a valid property name. | |
| 65 function* g(obj) { yield obj.yield; } | |
| 66 | |
| 67 // Checks that yield is a valid label in classic mode, but not valid in a strict | |
| 68 // mode or in generators. | |
| 69 function f() { yield: 1 } | |
| 70 assertSyntaxError("function f() { 'use strict'; yield: 1 }") | |
| 71 assertSyntaxError("function* g() { yield: 1 }") | |
| 72 | |
| 73 // Yield is only a keyword in the body of the generator, not in nested | |
| 74 // functions. | |
| 75 function* g() { function f(yield) { yield (yield + yield (0)); } } | |
| 76 | |
| 77 // Yield needs a RHS. | |
| 78 assertSyntaxError("function* g() { yield; }"); | |
| 79 | |
| 80 // Yield in a generator is not an identifier. | |
| 81 assertSyntaxError("function* g() { yield = 10; }"); | |
| 82 | |
| 83 // Yield binds very loosely, so this parses as "yield (3 + yield 4)", which is | |
| 84 // invalid. | |
| 85 assertSyntaxError("function* g() { yield 3 + yield 4; }"); | |
| 86 | |
| 87 // Yield is still a future-reserved-word in strict mode | |
| 88 assertSyntaxError("function f() { 'use strict'; var yield = 13; }"); | |
| 89 | |
| 90 // The name of the NFE is let-bound in G, so is invalid. | |
| 91 assertSyntaxError("function* g() { yield (function yield() {}); }"); | |
| 92 | |
| 93 // In generators, yield is invalid as a formal argument name. | |
| 94 assertSyntaxError("function* g(yield) { yield (10); }"); | |
| 95 | |
| 96 if (typeof reportCompare == "function") | |
| 97 reportCompare(true, true); |
