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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Current File : //home/akaindir/www/crm/libraries/htmlpurifier/library/HTMLPurifier/AttrDef/Integer.php
<?php

/**
 * Validates an integer.
 * @note While this class was modeled off the CSS definition, no currently
 *       allowed CSS uses this type.  The properties that do are: widows,
 *       orphans, z-index, counter-increment, counter-reset.  Some of the
 *       HTML attributes, however, find use for a non-negative version of this.
 */
class HTMLPurifier_AttrDef_Integer extends HTMLPurifier_AttrDef
{

    /**
     * Bool indicating whether or not negative values are allowed
     */
    protected $negative = true;

    /**
     * Bool indicating whether or not zero is allowed
     */
    protected $zero = true;

    /**
     * Bool indicating whether or not positive values are allowed
     */
    protected $positive = true;

    /**
     * @param $negative Bool indicating whether or not negative values are allowed
     * @param $zero Bool indicating whether or not zero is allowed
     * @param $positive Bool indicating whether or not positive values are allowed
     */
    public function __construct(
        $negative = true, $zero = true, $positive = true
    ) {
        $this->negative = $negative;
        $this->zero     = $zero;
        $this->positive = $positive;
    }

    public function validate($integer, $config, $context) {

        $integer = $this->parseCDATA($integer);
        if ($integer === '') return false;

        // we could possibly simply typecast it to integer, but there are
        // certain fringe cases that must not return an integer.

        // clip leading sign
        if ( $this->negative && $integer[0] === '-' ) {
            $digits = substr($integer, 1);
            if ($digits === '0') $integer = '0'; // rm minus sign for zero
        } elseif( $this->positive && $integer[0] === '+' ) {
            $digits = $integer = substr($integer, 1); // rm unnecessary plus
        } else {
            $digits = $integer;
        }

        // test if it's numeric
        if (!ctype_digit($digits)) return false;

        // perform scope tests
        if (!$this->zero     && $integer == 0) return false;
        if (!$this->positive && $integer > 0) return false;
        if (!$this->negative && $integer < 0) return false;

        return $integer;

    }

}

// vim: et sw=4 sts=4

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