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【PHP】解释器模式

作者:PHP设计模式 / 发布于2011/11/29/ 628

<div>?<?php
/**
* 转自 《PHP设计模式》 第十章： 解释器模式
* 解释器： 解释器设计模式用于分析一个实体的关键元素，并且针对每个元素都提供自己的解释或相应的动作。
* 解释器设计模式最常用于PHP/HTML 模板系统。
*
*/
class User {

protected $_username = "";

public function __construct($username) {
$this->_username = $username;
}

public function getProfilePage() {
$profile = "<h2>I like Never Again ! </h2>";
$profile .= "I love all of their songs. My favorite CD: ";
$profile .= "{{myCD.getTitle}}!!";

return $profile;
}
}
<div>class userCD {

protected $_user = NULL;

public function setUser(User $user) {
$this->_user = $user;
}

public function getTitle() {
$title = "Waste of a Rib";

return $title;
}
}
<div>class userCDInterpreter {

protected $_user = NULL;

public function setUser(User $user) {
$this->_user = $user;
}

public function getInterpreted() {
$profile = $this->_user->getProfilePage();

if (preg_match_all('/\{\{myCD\.(.*?)\}\}/', $profile, $triggers, PREG_SET_ORDER)) {
$replacements = array();

foreach ($triggers as $trigger) {
$replacements[] = $trigger[1];
}

$replacements = array_unique($replacements);

$myCD = new userCD();
$myCD->setUser($this->_user);

foreach ($replacements as $replacement) {
$profile = str_replace("{{myCD.{$replacement}}}", call_user_func(array($myCD, $replacement)), $profile);
}
}

return $profile;
}

}
<div>$username = "aaron";
$user = new User($username);
$interpreter = new userCDInterpreter();
$interpreter->setUser($user);</div>
<div>print "<h1>{$username}'s Profile</h1>";
print $interpreter->getInterpreted();</div>
<div>/* End of Interpreter.class.php */
/* Location the file Design/Interpreter.class.php */</div>

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