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<?php | ||
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namespace Amp\ByteStream; | ||
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use Amp\Promise; | ||
use function Amp\call; | ||
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final class LineReader | ||
{ | ||
/** @var string */ | ||
private $buffer = ""; | ||
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/** @var InputStream */ | ||
private $source; | ||
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public function __construct(InputStream $inputStream) | ||
{ | ||
$this->source = $inputStream; | ||
} | ||
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/** | ||
* @return Promise<string|null> | ||
*/ | ||
public function readLine(): Promise | ||
{ | ||
return call(function () { | ||
if (($pos = \strpos($this->buffer, "\n")) !== false) { | ||
$line = \substr($this->buffer, 0, $pos); | ||
$this->buffer = \substr($this->buffer, $pos + 1); | ||
return \rtrim($line, "\r"); | ||
} | ||
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while (null !== $chunk = yield $this->source->read()) { | ||
$this->buffer .= $chunk; | ||
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if (($pos = \strpos($this->buffer, "\n")) !== false) { | ||
$line = \substr($this->buffer, 0, $pos); | ||
$this->buffer = \substr($this->buffer, $pos + 1); | ||
return \rtrim($line, "\r"); | ||
} | ||
} | ||
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if ($this->buffer === "") { | ||
return null; | ||
} | ||
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$line = $this->buffer; | ||
$this->buffer = ""; | ||
return \rtrim($line, "\r"); | ||
}); | ||
} | ||
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public function getBuffer(): string | ||
{ | ||
return $this->buffer; | ||
} | ||
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public function clearBuffer(): void | ||
{ | ||
$this->buffer = ""; | ||
} | ||
} |
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<?php /** @noinspection PhpUnhandledExceptionInspection */ | ||
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namespace Amp\ByteStream; | ||
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use Amp\Iterator; | ||
use Amp\PHPUnit\TestCase; | ||
use function Amp\call; | ||
use function Amp\Promise\wait; | ||
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class LineReaderTest extends TestCase | ||
{ | ||
public function testSingleLine() | ||
{ | ||
$this->check(["abc"], ["abc"]); | ||
} | ||
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public function testMultiLineLf() | ||
{ | ||
$this->check(["abc\nef"], ["abc", "ef"]); | ||
} | ||
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public function testMultiLineCrLf() | ||
{ | ||
$this->check(["abc\r\nef"], ["abc", "ef"]); | ||
} | ||
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public function testMultiLineEmptyNewlineStart() | ||
{ | ||
$this->check(["\r\nabc\r\nef\r\n"], ["", "abc", "ef"]); | ||
} | ||
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public function testMultiLineEmptyNewlineEnd() | ||
{ | ||
$this->check(["abc\r\nef\r\n"], ["abc", "ef"]); | ||
} | ||
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public function testMultiLineEmptyNewlineMiddle() | ||
{ | ||
$this->check(["abc\r\n\r\nef\r\n"], ["abc", "", "ef"]); | ||
} | ||
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public function testEmpty() | ||
{ | ||
$this->check([], []); | ||
} | ||
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public function testEmptyCrLf() | ||
{ | ||
$this->check(["\r\n"], [""]); | ||
} | ||
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public function testEmptyCr() | ||
{ | ||
$this->check(["\r"], [""]); | ||
} | ||
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public function testMultiLineSlow() | ||
{ | ||
$this->check(["a", "bc", "\r", "\n\r\nef\r", "\n"], ["abc", "", "ef"]); | ||
} | ||
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public function testClearBuffer() | ||
{ | ||
wait(call(static function () { | ||
$inputStream = new IteratorStream(Iterator\fromIterable(["a\nb\nc"])); | ||
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$reader = new LineReader($inputStream); | ||
self::assertSame("a", yield $reader->readLine()); | ||
self::assertSame("b\nc", $reader->getBuffer()); | ||
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$reader->clearBuffer(); | ||
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self::assertSame("", $reader->getBuffer()); | ||
self::assertNull(yield $reader->readLine()); | ||
})); | ||
} | ||
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private function check(array $chunks, array $expectedLines) | ||
{ | ||
wait(call(static function () use ($chunks, $expectedLines) { | ||
$inputStream = new IteratorStream(Iterator\fromIterable($chunks)); | ||
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$reader = new LineReader($inputStream); | ||
$lines = []; | ||
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while (null !== $line = yield $reader->readLine()) { | ||
$lines[] = $line; | ||
} | ||
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self::assertSame($expectedLines, $lines); | ||
self::assertSame("", $reader->getBuffer()); | ||
})); | ||
} | ||
} |