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 Twilio;
use Iterator;
class Stream implements Iterator {
public $page;
public $firstPage;
public $limit;
public $currentRecord;
public $pageLimit;
public $currentPage;
function __construct(Page $page, $limit, $pageLimit) {
$this->page = $page;
$this->firstPage = $page;
$this->limit = $limit;
$this->currentRecord = 1;
$this->pageLimit = $pageLimit;
$this->currentPage = 1;
}
/**
* (PHP 5 >= 5.0.0)<br/>
* Return the current element
* @link http://php.net/manual/en/iterator.current.php
* @return mixed Can return any type.
*/
public function current() {
return $this->page->current();
}
/**
* (PHP 5 >= 5.0.0)<br/>
* Move forward to next element
* @link http://php.net/manual/en/iterator.next.php
* @return void Any returned value is ignored.
*/
public function next() {
$this->page->next();
$this->currentRecord++;
if ($this->overLimit()) {
return;
}
if (!$this->page->valid()) {
if ($this->overPageLimit()) {
return;
}
$this->page = $this->page->nextPage();
$this->currentPage++;
}
}
protected function overLimit() {
return ($this->limit !== null
&& $this->limit !== Values::NONE
&& $this->limit < $this->currentRecord);
}
protected function overPageLimit() {
return ($this->pageLimit !== null
&& $this->pageLimit !== Values::NONE
&& $this->pageLimit < $this->currentPage);
}
/**
* (PHP 5 >= 5.0.0)<br/>
* Return the key of the current element
* @link http://php.net/manual/en/iterator.key.php
* @return mixed scalar on success, or null on failure.
*/
public function key() {
return $this->currentRecord;
}
/**
* (PHP 5 >= 5.0.0)<br/>
* Checks if current position is valid
* @link http://php.net/manual/en/iterator.valid.php
* @return boolean The return value will be casted to boolean and then evaluated.
* Returns true on success or false on failure.
*/
public function valid() {
return $this->page && $this->page->valid() && !$this->overLimit() && !$this->overPageLimit();
}
/**
* (PHP 5 >= 5.0.0)<br/>
* Rewind the Iterator to the first element
* @link http://php.net/manual/en/iterator.rewind.php
* @return void Any returned value is ignored.
*/
public function rewind() {
$this->page = $this->firstPage;
$this->page->rewind();
$this->currentPage = 1;
$this->currentRecord = 1;
}
}