Automattic /
jetpack
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 csstidy_print 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 csstidy_print, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 42 | class csstidy_print { |
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| 43 | |||
| 44 | /** |
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| 45 | * Saves the input CSS string |
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| 46 | * @var string |
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| 47 | * @access private |
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| 48 | */ |
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| 49 | public $input_css = ''; |
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| 50 | /** |
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| 51 | * Saves the formatted CSS string |
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| 52 | * @var string |
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| 53 | * @access public |
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| 54 | */ |
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| 55 | public $output_css = ''; |
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| 56 | /** |
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| 57 | * Saves the formatted CSS string (plain text) |
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| 58 | * @var string |
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| 59 | * @access public |
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| 60 | */ |
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| 61 | public $output_css_plain = ''; |
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| 62 | |||
| 63 | function csstidy_print(&$css) { |
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| 66 | /** |
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| 67 | * Constructor |
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| 68 | * @param array $css contains the class csstidy |
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| 69 | * @access private |
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| 70 | * @version 1.0 |
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| 71 | */ |
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| 72 | function __construct(&$css) { |
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| 81 | |||
| 82 | /** |
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| 83 | * Resets output_css and output_css_plain (new css code) |
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| 84 | * @access private |
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| 85 | * @version 1.0 |
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| 86 | */ |
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| 87 | function _reset() { |
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| 91 | |||
| 92 | /** |
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| 93 | * Returns the CSS code as plain text |
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| 94 | * @param string $default_media default @media to add to selectors without any @media |
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| 95 | * @return string |
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| 96 | * @access public |
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| 97 | * @version 1.0 |
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| 98 | */ |
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| 99 | function plain($default_media='') { |
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| 103 | |||
| 104 | /** |
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| 105 | * Returns the formatted CSS code |
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| 106 | * @param string $default_media default @media to add to selectors without any @media |
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| 107 | * @return string |
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| 108 | * @access public |
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| 109 | * @version 1.0 |
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| 110 | */ |
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| 111 | function formatted($default_media='') { |
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| 115 | |||
| 116 | /** |
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| 117 | * Returns the formatted CSS code to make a complete webpage |
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| 118 | * @param string $doctype shorthand for the document type |
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| 119 | * @param bool $externalcss indicates whether styles to be attached internally or as an external stylesheet |
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| 120 | * @param string $title title to be added in the head of the document |
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| 121 | * @param string $lang two-letter language code to be added to the output |
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| 122 | * @return string |
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| 123 | * @access public |
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| 124 | * @version 1.4 |
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| 125 | */ |
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| 126 | function formatted_page($doctype='xhtml1.1', $externalcss=true, $title='', $lang='en') { |
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| 160 | |||
| 161 | /** |
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| 162 | * Returns the formatted CSS Code and saves it into $this->output_css and $this->output_css_plain |
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| 163 | * @param bool $plain plain text or not |
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| 164 | * @param string $default_media default @media to add to selectors without any @media |
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| 165 | * @access private |
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| 166 | * @version 2.0 |
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| 167 | */ |
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| 168 | function _print($plain = false, $default_media='') { |
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| 277 | |||
| 278 | /** |
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| 279 | * Gets the next token type which is $move away from $key, excluding comments |
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| 280 | * @param integer $key current position |
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| 281 | * @param integer $move move this far |
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| 282 | * @return mixed a token type |
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| 283 | * @access private |
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| 284 | * @version 1.0 |
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| 285 | */ |
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| 286 | function _seeknocomment($key, $move) { |
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| 299 | |||
| 300 | /** |
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| 301 | * Converts $this->css array to a raw array ($this->tokens) |
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| 302 | * @param string $default_media default @media to add to selectors without any @media |
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| 303 | * @access private |
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| 304 | * @version 1.0 |
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| 305 | */ |
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| 306 | function _convert_raw_css($default_media='') { |
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| 340 | |||
| 341 | /** |
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| 342 | * Same as htmlspecialchars, only that chars are not replaced if $plain !== true. This makes print_code() cleaner. |
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| 343 | * @param string $string |
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| 344 | * @param bool $plain |
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| 345 | * @return string |
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| 346 | * @see csstidy_print::_print() |
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| 347 | * @access private |
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| 348 | * @version 1.0 |
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| 349 | */ |
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| 350 | function _htmlsp($string, $plain) { |
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| 356 | |||
| 357 | /** |
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| 358 | * Get compression ratio |
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| 359 | * @access public |
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| 360 | * @return float |
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| 361 | * @version 1.2 |
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| 362 | */ |
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| 363 | function get_ratio() { |
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| 369 | |||
| 370 | /** |
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| 371 | * Get difference between the old and new code in bytes and prints the code if necessary. |
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| 372 | * @access public |
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| 373 | * @return string |
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| 374 | * @version 1.1 |
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| 375 | */ |
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| 376 | function get_diff() { |
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| 391 | |||
| 392 | /** |
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| 393 | * Get the size of either input or output CSS in KB |
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| 394 | * @param string $loc default is "output" |
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| 395 | * @access public |
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| 396 | * @return integer |
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| 397 | * @version 1.0 |
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| 398 | */ |
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| 399 | function size($loc = 'output') { |
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| 410 | |||
| 411 | } |
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| 412 |
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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: