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
/**
* Generic property list implementation
*/
class HTMLPurifier_PropertyList
{
/**
* Internal data-structure for properties
*/
protected $data = array();
/**
* Parent plist
*/
protected $parent;
protected $cache;
public function __construct($parent = null) {
$this->parent = $parent;
}
/**
* Recursively retrieves the value for a key
*/
public function get($name) {
if ($this->has($name)) return $this->data[$name];
// possible performance bottleneck, convert to iterative if necessary
if ($this->parent) return $this->parent->get($name);
throw new HTMLPurifier_Exception("Key '$name' not found");
}
/**
* Sets the value of a key, for this plist
*/
public function set($name, $value) {
$this->data[$name] = $value;
}
/**
* Returns true if a given key exists
*/
public function has($name) {
return array_key_exists($name, $this->data);
}
/**
* Resets a value to the value of it's parent, usually the default. If
* no value is specified, the entire plist is reset.
*/
public function reset($name = null) {
if ($name == null) $this->data = array();
else unset($this->data[$name]);
}
/**
* Squashes this property list and all of its property lists into a single
* array, and returns the array. This value is cached by default.
* @param $force If true, ignores the cache and regenerates the array.
*/
public function squash($force = false) {
if ($this->cache !== null && !$force) return $this->cache;
if ($this->parent) {
return $this->cache = array_merge($this->parent->squash($force), $this->data);
} else {
return $this->cache = $this->data;
}
}
/**
* Returns the parent plist.
*/
public function getParent() {
return $this->parent;
}
/**
* Sets the parent plist.
*/
public function setParent($plist) {
$this->parent = $plist;
}
}
// vim: et sw=4 sts=4