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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /js/src/tests/non262/generators/syntax.js | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | js/src/tests/non262/generators/syntax.js | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/js/src/tests/non262/generators/syntax.js b/js/src/tests/non262/generators/syntax.js new file mode 100644 index 0000000000..21ecf02875 --- /dev/null +++ b/js/src/tests/non262/generators/syntax.js @@ -0,0 +1,140 @@ +// This file was written by Andy Wingo <wingo@igalia.com> and originally +// contributed to V8 as generators-parsing.js, available here: +// +// http://code.google.com/p/v8/source/browse/branches/bleeding_edge/test/mjsunit/harmony/generators-parsing.js + +function assertSyntaxError(str) { + var msg; + var evil = eval; + try { + // Non-direct eval. + evil(str); + } catch (exc) { + if (exc instanceof SyntaxError) + return; + msg = "Assertion failed: expected SyntaxError, got " + exc; + } + if (msg === undefined) + msg = "Assertion failed: expected SyntaxError, but no exception thrown"; + throw new Error(msg + " - " + str); +} + +// Yield statements. +function* g() { yield 3; yield 4; } + +// Yield expressions. +function* g() { (yield 3) + (yield 4); } + +// Yield without a RHS. +function* g() { yield; } +function* g() { yield } +function* g() { + yield +} +function* g() { (yield) } +function* g() { [yield] } +function* g() { {yield} } +function* g() { (yield), (yield) } +function* g() { yield; yield } +function* g() { (yield) ? yield : yield } +function* g() { + (yield) + ? yield + : yield +} + +// If yield has a RHS, it needs to start on the same line. The * in a +// yield* counts as starting the RHS. +function* g() { + yield * + foo +} +assertThrowsInstanceOf(() => Function("function* g() { yield\n* foo }"), SyntaxError); +assertIteratorNext(function*(){ + yield + 3 + }(), undefined) + +// A YieldExpression is not a LogicalORExpression. +assertThrowsInstanceOf(() => Function("function* g() { yield ? yield : yield }"), SyntaxError); + +// You can have a generator in strict mode. +function* g() { "use strict"; yield 3; yield 4; } + +// Generators can have return statements also, which internally parse to a kind +// of yield expression. +function* g() { yield 1; return; } +function* g() { yield 1; return 2; } +function* g() { yield 1; return 2; yield "dead"; } + +// Generator expression. +(function* () { yield 3; }); + +// Named generator expression. +(function* g() { yield 3; }); + +// Generators do not have to contain yield expressions. +function* g() { } + +// YieldExpressions can occur in the RHS of a YieldExpression. +function* g() { yield yield 1; } +function* g() { yield 3 + (yield 4); } + +// Generator definitions with a name of "yield" are not specifically ruled out +// by the spec, as the `yield' name is outside the generator itself. However, +// in strict-mode, "yield" is an invalid identifier. +function* yield() { (yield 3) + (yield 4); } +assertSyntaxError("function* yield() { 'use strict'; (yield 3) + (yield 4); }"); + +// In classic mode, yield is a normal identifier, outside of generators. +function yield(yield) { yield: yield (yield + yield (0)); } + +// Yield is always valid as a key in an object literal. +({ yield: 1 }); +function* g() { yield ({ yield: 1 }) } +function* g() { yield ({ get yield() { return 1; }}) } + +// Yield is a valid property name. +function* g(obj) { yield obj.yield; } + +// Checks that yield is a valid label in classic mode, but not valid in a strict +// mode or in generators. +function f() { yield: 1 } +assertSyntaxError("function f() { 'use strict'; yield: 1 }") +assertSyntaxError("function* g() { yield: 1 }") + +// Yield is only a keyword in the body of the generator, not in nested +// functions. +function* g() { function f(yield) { yield (yield + yield (0)); } } + +// Yield in a generator is not an identifier. +assertSyntaxError("function* g() { yield = 10; }"); + +// Yield binds very loosely, so this parses as "yield (3 + yield 4)", which is +// invalid. +assertSyntaxError("function* g() { yield 3 + yield 4; }"); + +// Yield is still a future-reserved-word in strict mode +assertSyntaxError("function f() { 'use strict'; var yield = 13; }"); + +// The name of the NFE isn't let-bound in F/G, so this is valid. +function f() { (function yield() {}); } +function* g() { (function yield() {}); } + +// The name of the NFE is let-bound in the function/generator expression, so this is invalid. +assertSyntaxError("function f() { (function* yield() {}); }"); +assertSyntaxError("function* g() { (function* yield() {}); }"); + +// The name of the declaration is let-bound in F, so this is valid. +function f() { function yield() {} } +function f() { function* yield() {} } + +// The name of the declaration is let-bound in G, so this is invalid. +assertSyntaxError("function* g() { function yield() {} }"); +assertSyntaxError("function* g() { function* yield() {} }"); + +// In generators, yield is invalid as a formal argument name. +assertSyntaxError("function* g(yield) { yield (10); }"); + +if (typeof reportCompare == "function") + reportCompare(true, true); |