晋太元中,武陵人捕鱼为业。缘溪行,忘路之远近。忽逢桃花林,夹岸数百步,中无杂树,芳草鲜美,落英缤纷。渔人甚异之,复前行,欲穷其林。 林尽水源,便得一山,山有小口,仿佛若有光。便舍船,从口入。初极狭,才通人。复行数十步,豁然开朗。土地平旷,屋舍俨然,有良田、美池、桑竹之属。阡陌交通,鸡犬相闻。其中往来种作,男女衣着,悉如外人。黄发垂髫,并怡然自乐。 见渔人,乃大惊,问所从来。具答之。便要还家,设酒杀鸡作食。村中闻有此人,咸来问讯。自云先世避秦时乱,率妻子邑人来此绝境,不复出焉,遂与外人间隔。问今是何世,乃不知有汉,无论魏晋。此人一一为具言所闻,皆叹惋。余人各复延至其家,皆出酒食。停数日,辞去。此中人语云:“不足为外人道也。”(间隔 一作:隔绝) 既出,得其船,便扶向路,处处志之。及郡下,诣太守,说如此。太守即遣人随其往,寻向所志,遂迷,不复得路。 南阳刘子骥,高尚士也,闻之,欣然规往。未果,寻病终。后遂无问津者。
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<?php
namespace GuzzleHttp\Psr7;
use Psr\Http\Message\StreamInterface;
/**
* Provides a buffer stream that can be written to to fill a buffer, and read
* from to remove bytes from the buffer.
*
* This stream returns a "hwm" metadata value that tells upstream consumers
* what the configured high water mark of the stream is, or the maximum
* preferred size of the buffer.
*/
class BufferStream implements StreamInterface
{
private $hwm;
private $buffer = '';
/**
* @param int $hwm High water mark, representing the preferred maximum
* buffer size. If the size of the buffer exceeds the high
* water mark, then calls to write will continue to succeed
* but will return false to inform writers to slow down
* until the buffer has been drained by reading from it.
*/
public function __construct($hwm = 16384)
{
$this->hwm = $hwm;
}
public function __toString()
{
return $this->getContents();
}
public function getContents()
{
$buffer = $this->buffer;
$this->buffer = '';
return $buffer;
}
public function close()
{
$this->buffer = '';
}
public function detach()
{
$this->close();
}
public function getSize()
{
return strlen($this->buffer);
}
public function isReadable()
{
return true;
}
public function isWritable()
{
return true;
}
public function isSeekable()
{
return false;
}
public function rewind()
{
$this->seek(0);
}
public function seek($offset, $whence = SEEK_SET)
{
throw new \RuntimeException('Cannot seek a BufferStream');
}
public function eof()
{
return strlen($this->buffer) === 0;
}
public function tell()
{
throw new \RuntimeException('Cannot determine the position of a BufferStream');
}
/**
* Reads data from the buffer.
*/
public function read($length)
{
$currentLength = strlen($this->buffer);
if ($length >= $currentLength) {
// No need to slice the buffer because we don't have enough data.
$result = $this->buffer;
$this->buffer = '';
} else {
// Slice up the result to provide a subset of the buffer.
$result = substr($this->buffer, 0, $length);
$this->buffer = substr($this->buffer, $length);
}
return $result;
}
/**
* Writes data to the buffer.
*/
public function write($string)
{
$this->buffer .= $string;
// TODO: What should happen here?
if (strlen($this->buffer) >= $this->hwm) {
return false;
}
return strlen($string);
}
public function getMetadata($key = null)
{
if ($key == 'hwm') {
return $this->hwm;
}
return $key ? null : [];
}
}