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547 lines
15 KiB
547 lines
15 KiB
<?php
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/**
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* Flight: an extensible PHP micro-framework.
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*
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* @copyright Copyright (c) 2011, Mike Cao <mike@mikecao.com>
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* @license http://www.opensource.org/licenses/mit-license.php
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* @version 0.1
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*/
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class Flight {
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/**
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* Stored variables.
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*
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* @var array
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*/
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protected static $vars = array();
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/**
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* Registered classes.
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*
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* @var array
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*/
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protected static $classes = array();
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/**
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* Mapped methods.
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*
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* @var array
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*/
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protected static $methods = array();
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/**
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* Method filters.
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*
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* @var array
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*/
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protected static $filters = array();
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// Don't allow object instantiation
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private function __construct() {}
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private function __destruct() {}
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private function __clone() {}
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/**
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* Handles calls to static methods.
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*
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* @param string $name Method name
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* @param array $args Method parameters
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*/
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public static function __callStatic($name, $params) {
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// Check if call is mapped to a method
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if (isset(self::$methods[$name]) || method_exists(__CLASS__, '_'.$name)) {
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$method = self::$methods[$name] ?: array(__CLASS__, '_'.$name);
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// Run pre-filters
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if (!empty(self::$filters['before'][$name])) {
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self::filter(self::$filters['before'][$name], $params);
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}
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// Run requested method
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$output = self::execute($method, $params);
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// Run post-filters
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if (!empty(self::$filters['after'][$name])) {
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self::filter(self::$filters['after'][$name], $output);
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}
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return $output;
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}
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// Otherwise try to autoload class
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return self::load($name, (bool)$params[0]);
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}
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/**
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* Maps a callback to a framework method.
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*
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* @param string $name Method name
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* @param callback $callback Callback function
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*/
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public static function map($name, $callback) {
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if (method_exists(__CLASS__, $name)) {
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throw new Exception('Cannot override an existing framework method.');
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}
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self::$methods[$name] = $callback;
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}
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/**
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* Registers a class to a framework method.
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*
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* @param string $name Method name
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* @param string $class Class name
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* @param array $params Class initialization parameters
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* @param callback $callback Function to call after object instantiation
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*/
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public static function register($name, $class, array $params = array(), $callback = null) {
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if (method_exists(__CLASS__, $name)) {
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throw new Exception('Cannot override an existing framework method.');
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}
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self::$classes[$name] = array($class, $params, $callback);
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}
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/**
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* Loads a registered class.
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*
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* @param string $class Class name
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* @param array $method List of methods to load
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*/
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public static function load($name, $shared = true) {
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if (isset(self::$classes[$name])) {
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list($class, $params, $callback) = self::$classes[$name];
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$obj = ($shared) ?
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self::getInstance($class, $params) :
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self::getClass($class, $params);
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if ($callback) self::execute($callback, $ref = array($obj));
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return $obj;
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}
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return self::getInstance(ucfirst($name));
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}
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/**
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* Adds a pre-filter to a method.
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*
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* @param string $name Method name
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* @param callback $callback Callback function
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*/
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public static function before($name, $callback) {
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self::$filters['before'][$name][] = $callback;
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}
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/**
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* Adds a post-filter to a method.
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*
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* @param string $name Method name
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* @param callback $callback Callback function
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*/
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public static function after($name, $callback) {
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self::$filters['after'][$name][] = $callback;
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}
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/**
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* Executes a callback function.
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*
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* @param callback $callback Callback function
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* @param array $params Function parameters
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* @return mixed Function results
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*/
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public static function execute($callback, &$params) {
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if (is_callable($callback)) {
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return is_array($callback) ?
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self::invokeMethod($callback, $params) :
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self::callFunction($callback, $params);
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}
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}
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/**
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* Executes a chain of method filters.
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*
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* @param array $filters Chain of filters
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* @param array $params Method parameters
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* @param mixed $data Method output
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*/
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public static function filter($filters, &$data) {
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foreach ($filters as $callback) {
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$continue = self::execute($callback, $params = array(&$data));
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if ($continue === false) break;
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}
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}
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/**
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* Calls a function.
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*
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* @param string $func Name of function to call
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* @param array $params Function parameters
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*/
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public static function callFunction($func, array &$params = array()) {
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switch (count($params)) {
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case 0:
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return $func();
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case 1:
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return $func($params[0]);
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case 2:
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return $func($params[0], $params[1]);
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case 3:
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return $func($params[0], $params[1], $params[2]);
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case 4:
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return $func($params[0], $params[1], $params[2], $params[3]);
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case 5:
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return $func($params[0], $params[1], $params[2], $params[3], $params[4]);
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default:
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return call_user_func_array($func, $params);
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}
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}
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/**
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* Invokes a method.
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*
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* @param mixed $func Class method as either an array or string
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* @param array $params Class initialization parameters
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*/
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public static function invokeMethod($func, array &$params = array()) {
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list($class, $method) = $func;
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switch (count($params)) {
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case 0:
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return $class::$method();
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case 1:
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return $class::$method($params[0]);
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case 2:
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return $class::$method($params[0], $params[1]);
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case 3:
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return $class::$method($params[0], $params[1], $params[2]);
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case 4:
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return $class::$method($params[0], $params[1], $params[2], $params[3]);
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case 5:
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return $class::$method($params[0], $params[1], $params[2], $params[3], $params[4]);
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default:
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return call_user_func_array($func, $params);
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}
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}
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/**
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* Gets a single instance of a class.
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*
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* @param string $class Class name
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* @param array $params Class initialization parameters
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*/
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public static function getInstance($class, array $params = array()) {
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static $instances = array();
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if (!isset($instances[$class])) {
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$instances[$class] = self::getClass($class, $params);
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}
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return $instances[$class];
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}
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/**
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* Gets a class object.
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*
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* @param string $class Class name
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* @param array $params Class initialization parameters
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*/
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public static function getClass($class, array $params = array()) {
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switch (count($params)) {
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case 0:
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return new $class();
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case 1:
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return new $class($params[0]);
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case 2:
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return new $class($params[0], $params[1]);
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case 3:
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return new $class($params[0], $params[1], $params[2]);
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case 4:
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return new $class($params[0], $params[1], $params[2], $params[3]);
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case 5:
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return new $class($params[0], $params[1], $params[2], $params[3], $params[4]);
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default:
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$ref_class = new ReflectionClass($class);
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return $ref_class->newInstanceArgs($params);
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}
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}
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/**
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* Gets a variable.
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*
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* @param string $key Key
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* @return mixed
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*/
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public static function get($key) {
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return self::$vars[$key];
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}
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/**
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* Sets a variable.
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*
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* @param mixed $key Key
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* @param string $value Value
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*/
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public static function set($key, $value = null) {
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// If key is an array, save each key value pair
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if (is_array($key)) {
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foreach ($key as $k => $v) {
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self::$vars[$k] = $v;
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}
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}
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// If key is an object, save each property
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else if (is_object($key)) {
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foreach (get_object_vars($key) as $k => $v) {
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self::$vars[$k] = $v;
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}
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}
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else if (is_string($key)) {
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self::$vars[$key] = $value;
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}
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}
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/**
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* Checks if a variable exists.
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*
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* @param string $key Key
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* @return bool Variable status
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*/
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public static function exists($key) {
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return isset(self::$vars[$key]);
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}
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/**
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* Unsets a variable. If no key is passed in, clear all variables.
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*
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* @param string $key Key
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*/
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public static function clear($key = null) {
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if (is_null($key)) {
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self::$vars = array();
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}
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else {
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unset(self::$vars[$key]);
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}
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}
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/**
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* Initializes the framework.
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*/
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public static function init() {
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static $initialized = false;
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if (!$initialized) {
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// Register autoloader
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spl_autoload_register(array(__CLASS__, 'autoload'));
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// Handle errors internally
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set_error_handler(array(__CLASS__, 'handleError'));
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// Handle exceptions internally
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set_exception_handler(array(__CLASS__, 'handleException'));
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// Turn off notices
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error_reporting (E_ALL ^ E_NOTICE);
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// Fix magic quotes
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if (get_magic_quotes_gpc()) {
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$func = function ($value) use (&$func) {
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return is_array($value) ? array_map($func, $value) : stripslashes($value);
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};
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$_GET = array_map($func, $_GET);
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$_POST = array_map($func, $_POST);
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$_COOKIE = array_map($func, $_COOKIE);
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}
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// Enable output buffering
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ob_start();
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$initialized = true;
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}
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}
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/**
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* Autoloads classes.
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*
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* @param string $class Class name
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*/
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public static function autoload($class) {
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$file = str_replace('\\', '/', str_replace('_', '/', $class)).'.php';
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$base = (strpos($file, '/') === false) ? __DIR__ : (self::get('flight.lib.path') ?: '.');
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if (file_exists($base.'/'.$file)) {
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require $base.'/'.$file;
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}
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else {
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throw new Exception('Unable to load file: '.$base.'/'.$file);
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}
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}
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/**
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* Custom error handler.
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*/
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public static function handleError($errno, $errstr, $errfile, $errline) {
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if (in_array($errno, array(E_USER_ERROR, E_RECOVERABLE_ERROR))) {
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static::error(new ErrorException($errstr, 0, $errno, $errfile, $errline));
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}
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}
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/**
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* Custom exception handler.
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*/
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public static function handleException(Exception $e) {
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try {
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static::error($e);
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}
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catch (Exception $ex) {
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exit(
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'<h1>500 Internal Server Error</h1>'.
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'<h3>'.$ex->getMessage().'</h3>'.
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'<pre>'.$ex->getTraceAsString().'</pre>'
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);
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}
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}
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/**
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* Routes a URL to a callback function.
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*
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* @param string $pattern URL pattern to match
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* @param callback $callback Callback function
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*/
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public static function _route($pattern, $callback) {
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self::router()->map($pattern, $callback);
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}
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/**
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* Start the framework.
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*/
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public static function _start() {
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// Route the request
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$result = self::router()->route(self::request());
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if ($result !== false) {
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list($callback, $params) = $result;
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self::execute($callback, $params);
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}
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else {
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self::notFound();
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}
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// Disable caching for AJAX requests
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if (self::request()->isAjax) {
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self::response()->cache(false);
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}
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// Allow post-filters to run
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self::after('start', array(__CLASS__, 'stop'));
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}
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/**
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* Stops the framework and outputs the current response.
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*/
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public static function _stop() {
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self::response()->
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write(ob_get_clean())->
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send();
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}
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/**
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* Stops processing and returns a given response.
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*
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* @param int $code HTTP status code
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* @param int $msg Response text
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*/
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public static function _halt($code = 200, $text = '') {
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self::response(false)->
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status($code)->
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write($text)->
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cache(false)->
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send();
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}
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/**
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* Sends an HTTP 500 response for any errors.
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*
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* @param object $ex Exception
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*/
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public static function _error(Exception $e) {
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self::response(false)->
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status(500)->
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write(
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'<h1>500 Internal Server Error</h1>'.
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'<h3>'.$e->getMessage().'</h3>'.
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'<pre>'.$e->getTraceAsString().'</pre>'
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)->
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send();
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}
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/**
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* Sends an HTTP 404 response when a URL is not found.
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*/
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public static function _notFound() {
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self::response(false)->
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status(404)->
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write(
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'<h1>404 Not Found</h1>'.
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'<h3>The page you have requested could not be found.</h3>'.
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str_repeat(' ', 512)
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)->
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send();
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}
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/**
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* Redirects the current request to another URL.
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*
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* @param string $url URL
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*/
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public static function _redirect($url, $code = 303) {
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self::response(false)->
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status($code)->
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header('Location', $url)->
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write($url)->
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send();
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}
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/**
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* Renders a template.
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*
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* @param string $file Template file
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* @param array $data Template data
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*/
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public static function _render($file, $data = null) {
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self::view()->render($file, $data);
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}
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/**
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* Handles ETag HTTP caching.
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*
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* @param string $id ETag identifier
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* @param string $type ETag type
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*/
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public static function _etag($id, $type = 'strong') {
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$id = (($type === 'weak') ? 'W/' : '').$id;
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self::response()->header('ETag', $id);
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if ($_SERVER['HTTP_IF_NONE_MATCH'] === $id) {
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self::halt(304);
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}
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}
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/**
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* Handles last modified HTTP caching.
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*
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* @param int $time Unix timestamp
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*/
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public static function _lastModified($time) {
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self::response()->header('Last-Modified', date(DATE_RFC1123, $time));
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if (strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) === $time) {
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self::halt(304);
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}
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}
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}
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// Initialize framework on include
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Flight::init();
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?>
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