mirror of
https://github.com/RGBCube/serenity
synced 2025-05-15 21:14:59 +00:00
3194177dce
This commit implements parsing for `yield *expr`, and the multiple
ways something can or can't be parsed like that.
Also makes yield-from a TODO in the bytecode generator.
Behold, the glory of javascript syntax:
```js
// 'yield' = expression in generators.
function* foo() {
yield
*bar; // <- Syntax error here, expression can't start with *
}
// 'yield' = identifier anywhere else.
function foo() {
yield
*bar; // Perfectly fine, this is just `yield * bar`
}
```
41 lines
1.5 KiB
JavaScript
41 lines
1.5 KiB
JavaScript
describe("parsing freestanding generators", () => {
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test("simple", () => {
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expect(`function* foo() {}`).toEval();
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expect(`function *foo() {}`).toEval();
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expect(`function
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*foo() {}`).toEval();
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});
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test("yield expression", () => {
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expect(`function* foo() { yield; }`).toEval();
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expect(`function* foo() { yield (yield); }`).toEval();
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expect(`function* foo() { yield (yield foo); }`).toEval();
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expect(`function foo() { yield; }`).toEval();
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expect(`function foo() { yield 3; }`).not.toEval();
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});
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test("yield-from expression", () => {
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expect(`function* foo() { yield *bar; }`).toEval();
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expect(`function* foo() { yield *(yield); }`).toEval();
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expect(`function* foo() { yield
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*bar; }`).not.toEval();
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expect(`function foo() { yield
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*bar; }`).toEval();
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});
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});
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describe("parsing object literal generator functions", () => {
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test("simple", () => {
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expect(`x = { *foo() { } }`).toEval();
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expect(`x = { * foo() { } }`).toEval();
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expect(`x = { *
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foo() { } }`).toEval();
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});
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test("yield", () => {
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expect(`x = { foo() { yield; } }`).toEval();
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expect(`x = { *foo() { yield; } }`).toEval();
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expect(`x = { *foo() { yield 42; } }`).toEval();
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expect(`x = { foo() { yield 42; } }`).not.toEval();
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expect(`x = { *foo() { yield (yield); } }`).toEval();
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expect(`x = { *
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foo() { yield (yield); } }`).toEval();
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});
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});
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