src/PHPT/Util/Diff.php

   1 <?php
   2
   3 class PHPT_Util_Diff
   4 {
   5     private $_wanted = array();
   6     private $_actual = array();
   7
   8     public function __construct($wanted, $actual)
   9     {
  10         if ($this->_invalidString($wanted)) {
  11             throw new PHPT_Util_Diff_InvalidParameter('wanted');
  12         }
  13         if ($this->_invalidString($actual)) {
  14             throw new PHPT_Util_Diff_InvalidParameter('actual');
  15         }
  16         $standardize_eol = array($this, '_standardizeEol');
  17         $this->_wanted = array_map($standardize_eol, explode("\n", $wanted));
  18         $this->_actual = array_map($standardize_eol, explode("\n", $actual));
  19     }
  20
  21     public function __toString()
  22     {
  23         if ($this->_cheapComparison()) {
  24             return '';
  25         }
  26
  27         $return = array();
  28
  29         $actual_diff = array_diff_assoc($this->_wanted, $this->_actual);
  30         $wanted_diff = array_diff_assoc($this->_actual, $this->_wanted);
  31
  32         foreach ($wanted_diff as $key => $value) {
  33             if (empty($value)) {
  34                 continue;
  35             }
  36             $key++;
  37             $return[sprintf('%03d>', $key)] = sprintf('%03d+ %s', $key, $value);
  38         }
  39
  40         foreach ($actual_diff as $key => $value) {
  41             if (empty($value)) {
  42                 continue;
  43             }
  44             $key++;
  45             $return[sprintf('%03d<', $key)] = sprintf('%03d- %s', $key, $value);
  46         }
  47
  48         ksort($return);
  49         return implode(PHP_EOL, $return);
  50     }
  51
  52     private function _standardizeEol($value)
  53     {
  54         return rtrim($value, "\r");
  55     }
  56
  57     private function _cheapComparison()
  58     {
  59         return strcmp(serialize($this->_wanted), serialize($this->_actual)) === 0;
  60     }
  61
  62     private function _invalidString($string)
  63     {
  64         if (is_string($string)) {
  65             return false;
  66         } elseif (is_object($string)) {
  67             return !(method_exists($string, '__toString') && (string)$string == $string);
  68         }
  69         return (string)$string != $string;
  70     }
  71 }
  72