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 JmesPath;
/**
* Uses an external tree visitor to interpret an AST.
*/
class AstRuntime
{
private $parser;
private $interpreter;
private $cache = [];
private $cachedCount = 0;
public function __construct(
Parser $parser = null,
callable $fnDispatcher = null
) {
$fnDispatcher = $fnDispatcher ?: FnDispatcher::getInstance();
$this->interpreter = new TreeInterpreter($fnDispatcher);
$this->parser = $parser ?: new Parser();
}
/**
* Returns data from the provided input that matches a given JMESPath
* expression.
*
* @param string $expression JMESPath expression to evaluate
* @param mixed $data Data to search. This data should be data that
* is similar to data returned from json_decode
* using associative arrays rather than objects.
*
* @return mixed|null Returns the matching data or null
*/
public function __invoke($expression, $data)
{
if (!isset($this->cache[$expression])) {
// Clear the AST cache when it hits 1024 entries
if (++$this->cachedCount > 1024) {
$this->cache = [];
$this->cachedCount = 0;
}
$this->cache[$expression] = $this->parser->parse($expression);
}
return $this->interpreter->visit($this->cache[$expression], $data);
}
}