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Discard the state in reservoir() for invalid arguments #121

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merged 1 commit into from
Apr 15, 2023
Merged

Discard the state in reservoir() for invalid arguments #121

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3 changes: 3 additions & 0 deletions src/Standard.php
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Original file line number Diff line number Diff line change
Expand Up @@ -778,6 +778,9 @@ public function reservoir(int $size, ?callable $weightFunc = null): array
}

if ($size <= 0) {
// Discard the state to emulate full consumption
$this->pipeline = null;

return [];
}

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10 changes: 8 additions & 2 deletions tests/ReservoirTest.php
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Original file line number Diff line number Diff line change
Expand Up @@ -158,9 +158,15 @@ public static function provideWeightedInputs(): iterable
*/
public function testWeightedSampleFromGenerator(array $input, int $size, callable $weightFn, array $expected): void
{
$this->assertSame($expected, map(static function () use ($input) {
$pipeline = map(static function () use ($input) {
yield from $input;
})->reservoir($size, $weightFn));
});

$this->assertSame($expected, $pipeline->reservoir($size, $weightFn));

if ($size <= 0) {
$this->assertSame([], $pipeline->toArray());
}
}

/**
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