smartest json parser

smartest json parser.txt

最小的json parser使用递归逻辑也要100到200行代码:
https://github.com/no1msd/json.hpp/blob/master/include/json.hpp
https://www.jianshu.com/p/d5eee50c5e24

有没有更巧妙的办法呢? smartest dirty json parser 体现程序员"分形复用"的思维而不要去写if else switch:

类似于:
<?php
$json='{"a":{"b":"c", "k":"jack"},"d":"peter", "x": 1, "t": {"bb":"c", "kk":"jack"}}';

function get($json, $path)
{
    $json=implode(",\n", explode(',', $json));
    $json=preg_replace_callback_array(array('/{[^{}]+}/'=>function($match){return strtr($match[0], array("\n"=>"\n    "));}), $json);
    return $json;
}

echo get($json, 'a[0].b');