Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like Router often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Router, and based on these observations, apply Extract Interface, too.
1 | <?php |
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11 | class Router |
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12 | { |
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13 | /** |
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14 | * Reference to instantiated controller object. |
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15 | * |
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16 | * @var object |
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17 | */ |
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18 | protected static $instance = false; |
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19 | |||
20 | /** |
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21 | * System configuration |
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22 | * |
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23 | * @var object |
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24 | */ |
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25 | private $configuration; |
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26 | |||
27 | /** |
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28 | * The active module |
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29 | * |
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30 | * @var string |
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31 | * @access public |
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32 | */ |
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33 | public $module; |
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34 | |||
35 | /** |
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36 | * The active controller |
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37 | * |
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38 | * @var string |
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39 | * @access public |
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40 | */ |
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41 | public $controller; |
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42 | |||
43 | /** |
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44 | * The active method |
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45 | * |
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46 | * @var string |
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47 | * @access public |
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48 | */ |
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49 | public $method; |
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50 | |||
51 | /** |
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52 | * The base URL |
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53 | * |
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54 | * @var string |
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55 | * @access public |
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56 | */ |
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57 | public $baseURL; |
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58 | |||
59 | /** |
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60 | * Default module |
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61 | * |
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62 | * @var string |
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63 | * @access public |
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64 | */ |
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65 | public $defaultModule; |
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66 | |||
67 | /** |
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68 | * Default controller |
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69 | * |
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70 | * @var string |
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71 | * @access public |
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72 | */ |
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73 | public $defaultController; |
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74 | |||
75 | /** |
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76 | * Default method |
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77 | * |
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78 | * @var string |
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79 | * @access public |
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80 | */ |
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81 | public $defaultMethod; |
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82 | |||
83 | /** |
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84 | * Default uri |
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85 | * |
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86 | * @var string |
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87 | * @access public |
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88 | */ |
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89 | public $uri; |
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90 | /** |
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91 | * Load up some basic configuration settings. |
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92 | */ |
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93 | 28 | public function __construct() |
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94 | { |
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95 | 28 | self::$instance = $this; |
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96 | |||
97 | 28 | $app = App::getInstance(); |
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98 | 28 | $moduleConfig = $app->getConfiguration('modules'); |
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99 | |||
100 | 28 | $this->defaultModule = $moduleConfig->defaultModule; |
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101 | 28 | $defaultModule = $this->defaultModule; |
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102 | 28 | $this->defaultController = $moduleConfig->$defaultModule->defaultController; |
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103 | 28 | $this->defaultMethod = $moduleConfig->$defaultModule->defaultMethod; |
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104 | |||
105 | 28 | $normalizedURI = $this->normalizeURI(); |
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106 | |||
107 | //check routes |
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108 | |||
109 | |||
110 | 28 | $this->uri = $this->uri($normalizedURI); |
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111 | 28 | $this->baseURL = $this->baseURL(); |
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112 | 28 | $this->currentURL = $this->currentURL(); |
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113 | |||
114 | //@TODO: routing |
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115 | 28 | $uriChunks = $this->parseURI($this->uri); |
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116 | |||
117 | 18 | $app = App::getInstance(); |
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118 | |||
119 | 18 | $app->setConfiguration( |
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120 | 18 | 'router', |
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121 | (object)[ |
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122 | 18 | 'module' => $uriChunks[0], |
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123 | 18 | 'controller' => $uriChunks[1], |
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124 | 18 | 'method' => $uriChunks[2], |
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125 | 18 | 'params' => array_slice($uriChunks, 3), |
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126 | 18 | 'baseURL' => $this->baseURL, |
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127 | 18 | 'currentURL' => $this->currentURL |
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128 | ] |
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129 | ); |
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130 | 18 | } |
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131 | |||
132 | |||
133 | 28 | private function isURIClean($uri, $uriChunks) |
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134 | { |
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135 | 28 | if (!preg_match("/^[a-z0-9:_\/\.\[\]-]+$/i", $uri) |
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136 | 19 | || array_filter( |
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137 | $uriChunks, |
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138 | function ($uriChunk) { |
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139 | 19 | if (strpos($uriChunk, '__') !== false) { |
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140 | 1 | return true; |
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141 | } |
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142 | 28 | } |
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143 | ) |
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144 | ) { |
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145 | 10 | return false; |
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146 | } else { |
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147 | 18 | return true; |
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148 | } |
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149 | } |
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150 | |||
151 | //@TODO add Security class. |
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152 | 22 | private function normalize($data) |
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153 | { |
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154 | 22 | if (is_numeric($data)) { |
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155 | 11 | if (is_int($data) || ctype_digit(trim($data, '-'))) { |
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156 | 3 | $data = (int)$data; |
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157 | 8 | } elseif ($data === (string)(float)$data) { |
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158 | //@TODO: this needs work.. 9E26 converts to float |
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159 | 4 | $data = (float)$data; |
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160 | } |
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161 | } |
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162 | 22 | return $data; |
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163 | } |
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164 | |||
165 | /** |
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166 | * Parse and explode URI segments into chunks |
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167 | * |
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168 | * @access private |
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169 | * |
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170 | * @param string $uri |
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171 | * |
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172 | * @return array chunks of uri |
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173 | * @throws RouteException on disallowed characters |
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174 | */ |
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175 | 28 | private function parseURI($uri) |
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176 | { |
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177 | 28 | $uriFragments = explode('/', $uri); |
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178 | 28 | $uriChunks = []; |
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179 | 28 | $params = []; |
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180 | 28 | $iteration = 0; |
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181 | 28 | foreach ($uriFragments as $location => $fragment) { |
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182 | 28 | if ($iteration > 2) { |
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183 | 22 | $params[] = $this->normalize(trim($fragment)); |
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184 | } else { |
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185 | 28 | $uriChunks[] = trim($fragment); |
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186 | } |
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187 | 28 | $iteration++; |
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188 | } |
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189 | |||
190 | 28 | $result = array_merge($uriChunks, $params); |
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191 | |||
192 | 28 | if ($this->isURIClean($uri, $result) === false) { |
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193 | 10 | throw new RouteException('Invalid key characters.'); |
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194 | } |
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195 | |||
196 | 18 | return $result; |
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197 | } |
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198 | |||
199 | /** |
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200 | * Normalize the $_SERVER vars for formatting the URI. |
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201 | * |
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202 | * @access private |
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203 | * @return string formatted/u/r/l |
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204 | */ |
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205 | 28 | private function normalizeURI() |
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206 | { |
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207 | 28 | if (!empty($_SERVER['PATH_INFO'])) { |
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208 | $normalizedURI = $_SERVER['PATH_INFO']; |
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209 | 28 | } elseif (!empty($_SERVER['REQUEST_URI'])) { |
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210 | 26 | $normalizedURI = $_SERVER['REQUEST_URI']; |
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211 | } else { |
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212 | 4 | $normalizedURI = false; |
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213 | } |
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214 | |||
215 | 28 | if ($normalizedURI === '/') { |
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216 | 2 | $normalizedURI = false; |
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217 | } |
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218 | |||
219 | 28 | $normalizedURI = ltrim(preg_replace('/\?.*/', '', $normalizedURI), '/'); |
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220 | |||
221 | 28 | if (! empty($this->configuration->routes)) { |
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222 | $normalizedURI = $this->discoverRoute($normalizedURI); |
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223 | } |
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224 | |||
225 | 28 | return $normalizedURI; |
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226 | } |
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227 | |||
228 | private function discoverRoute($uri) |
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257 | |||
258 | /** |
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259 | * Normalize the $_SERVER vars for formatting the URI. |
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260 | * |
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261 | * @access public |
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262 | * @return string formatted/u/r/l |
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263 | */ |
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264 | 28 | private function uri($uri) |
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277 | |||
278 | 28 | private function sortURISegments($uriChunks = []) |
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314 | |||
315 | 2 | private function addQueryString($url, $key, $value) |
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325 | |||
326 | 2 | private function removeQueryString($url, $key) |
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332 | |||
333 | /** |
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334 | * Return the currentURL w/ query strings |
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335 | * |
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336 | * @access public |
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337 | * @return string http://tld.com/formatted/u/r/l?q=bingo |
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338 | */ |
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339 | 28 | public function currentURL($params = false) |
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358 | |||
359 | /** |
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360 | * Return the baseURL |
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361 | * |
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362 | * @access public |
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363 | * @return string http://tld.com |
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364 | */ |
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365 | 28 | public function baseURL($path = '') |
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392 | |||
393 | /** |
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394 | * Set optional status header, and redirect to provided URL |
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395 | * |
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396 | * @access public |
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397 | * @return bool |
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398 | */ |
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399 | public function redirect($url = '/', $status = null) |
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450 | } |
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451 |
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: