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/public_html/crm/libraries/htmlpurifier/library/HTMLPurifier/Length.php
<?php

/**
 * Represents a measurable length, with a string numeric magnitude
 * and a unit. This object is immutable.
 */
class HTMLPurifier_Length
{

    /**
     * String numeric magnitude.
     */
    protected $n;

    /**
     * String unit. False is permitted if $n = 0.
     */
    protected $unit;

    /**
     * Whether or not this length is valid. Null if not calculated yet.
     */
    protected $isValid;

    /**
     * Lookup array of units recognized by CSS 2.1
     */
    protected static $allowedUnits = array(
        'em' => true, 'ex' => true, 'px' => true, 'in' => true,
        'cm' => true, 'mm' => true, 'pt' => true, 'pc' => true
    );

    /**
     * @param number $n Magnitude
     * @param string $u Unit
     */
    public function __construct($n = '0', $u = false) {
        $this->n = (string) $n;
        $this->unit = $u !== false ? (string) $u : false;
    }

    /**
     * @param string $s Unit string, like '2em' or '3.4in'
     * @warning Does not perform validation.
     */
    static public function make($s) {
        if ($s instanceof HTMLPurifier_Length) return $s;
        $n_length = strspn($s, '1234567890.+-');
        $n = substr($s, 0, $n_length);
        $unit = substr($s, $n_length);
        if ($unit === '') $unit = false;
        return new HTMLPurifier_Length($n, $unit);
    }

    /**
     * Validates the number and unit.
     */
    protected function validate() {
        // Special case:
        if ($this->n === '+0' || $this->n === '-0') $this->n = '0';
        if ($this->n === '0' && $this->unit === false) return true;
        if (!ctype_lower($this->unit)) $this->unit = strtolower($this->unit);
        if (!isset(HTMLPurifier_Length::$allowedUnits[$this->unit])) return false;
        // Hack:
        $def = new HTMLPurifier_AttrDef_CSS_Number();
        $result = $def->validate($this->n, false, false);
        if ($result === false) return false;
        $this->n = $result;
        return true;
    }

    /**
     * Returns string representation of number.
     */
    public function toString() {
        if (!$this->isValid()) return false;
        return $this->n . $this->unit;
    }

    /**
     * Retrieves string numeric magnitude.
     */
    public function getN() {return $this->n;}

    /**
     * Retrieves string unit.
     */
    public function getUnit() {return $this->unit;}

    /**
     * Returns true if this length unit is valid.
     */
    public function isValid() {
        if ($this->isValid === null) $this->isValid = $this->validate();
        return $this->isValid;
    }

    /**
     * Compares two lengths, and returns 1 if greater, -1 if less and 0 if equal.
     * @warning If both values are too large or small, this calculation will
     *          not work properly
     */
    public function compareTo($l) {
        if ($l === false) return false;
        if ($l->unit !== $this->unit) {
            $converter = new HTMLPurifier_UnitConverter();
            $l = $converter->convert($l, $this->unit);
            if ($l === false) return false;
        }
        return $this->n - $l->n;
    }

}

// vim: et sw=4 sts=4

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