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 Swift_CharacterStream_ArrayCharacterStream 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 Swift_CharacterStream_ArrayCharacterStream, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 16 | class Swift_CharacterStream_ArrayCharacterStream implements Swift_CharacterStream |
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| 17 | { |
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| 18 | /** |
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| 19 | * A map of byte values and their respective characters |
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| 20 | * |
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| 21 | * @var array |
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| 22 | */ |
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| 23 | private static $_charMap; |
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| 24 | |||
| 25 | /** |
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| 26 | * A map of characters and their derivative byte values |
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| 27 | * |
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| 28 | * @var array |
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| 29 | */ |
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| 30 | private static $_byteMap; |
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| 31 | |||
| 32 | /** |
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| 33 | * The char reader (lazy-loaded) for the current charset |
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| 34 | * |
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| 35 | * @var Swift_CharacterReader |
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| 36 | */ |
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| 37 | private $_charReader; |
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| 38 | |||
| 39 | /** |
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| 40 | * A factory for creating CharacterReader instance |
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| 41 | * |
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| 42 | * @var Swift_CharacterReaderFactory |
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| 43 | */ |
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| 44 | private $_charReaderFactory; |
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| 45 | |||
| 46 | /** |
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| 47 | * The character set this stream is using |
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| 48 | * |
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| 49 | * @var string |
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| 50 | */ |
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| 51 | private $_charset; |
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| 52 | |||
| 53 | /** |
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| 54 | * Array of characters |
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| 55 | * |
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| 56 | * @var array |
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| 57 | */ |
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| 58 | private $_array = array(); |
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| 59 | |||
| 60 | /** |
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| 61 | * Size of the array of character |
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| 62 | * |
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| 63 | * @var int |
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| 64 | */ |
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| 65 | private $_array_size = 0; |
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| 66 | |||
| 67 | /** |
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| 68 | * The current character offset in the stream |
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| 69 | * |
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| 70 | * @var int |
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| 71 | */ |
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| 72 | private $_offset = 0; |
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| 73 | |||
| 74 | /** |
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| 75 | * Create a new CharacterStream with the given $chars, if set. |
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| 76 | * |
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| 77 | * @param Swift_CharacterReaderFactory $factory for loading validators |
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| 78 | * @param string $charset used in the stream |
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| 79 | */ |
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| 80 | 48 | public function __construct(Swift_CharacterReaderFactory $factory, $charset) |
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| 81 | { |
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| 82 | 48 | self::_initializeMaps(); |
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| 83 | 48 | $this->setCharacterReaderFactory($factory); |
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| 84 | 48 | $this->setCharacterSet($charset); |
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| 85 | 48 | } |
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| 86 | |||
| 87 | /** |
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| 88 | * Set the character set used in this CharacterStream. |
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| 89 | * |
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| 90 | * @param string $charset |
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| 91 | */ |
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| 92 | 48 | public function setCharacterSet($charset) |
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| 93 | { |
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| 94 | 48 | $this->_charset = $charset; |
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| 95 | 48 | $this->_charReader = null; |
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| 96 | 48 | } |
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| 97 | |||
| 98 | /** |
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| 99 | * Set the CharacterReaderFactory for multi charset support. |
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| 100 | * |
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| 101 | * @param Swift_CharacterReaderFactory $factory |
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| 102 | */ |
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| 103 | 48 | public function setCharacterReaderFactory(Swift_CharacterReaderFactory $factory) |
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| 107 | |||
| 108 | /** |
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| 109 | * Overwrite this character stream using the byte sequence in the byte stream. |
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| 110 | * |
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| 111 | * @param Swift_OutputByteStream $os output stream to read from |
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| 112 | */ |
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| 113 | 2 | public function importByteStream(Swift_OutputByteStream $os) |
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| 114 | { |
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| 115 | 2 | if (!isset($this->_charReader)) { |
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| 116 | 2 | $this->_charReader = $this->_charReaderFactory->getReaderFor($this->_charset); |
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| 117 | 2 | } |
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| 118 | |||
| 119 | 2 | $startLength = $this->_charReader->getInitialByteSize(); |
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| 120 | 2 | while (false !== $bytes = $os->read($startLength)) { |
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| 121 | |||
| 122 | 2 | $c = array(); |
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| 123 | 2 | $len = strlen($bytes); |
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| 124 | 2 | for ($i = 0; $i < $len; ++$i) { |
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| 125 | 2 | $c[] = self::$_byteMap[$bytes[$i]]; |
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| 126 | 2 | } |
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| 127 | |||
| 128 | 2 | $size = count($c); |
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| 129 | 2 | $need = $this->_charReader->validateByteSequence($c, $size); |
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| 130 | 2 | if ($need > 0) { |
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| 131 | 2 | $bytes = $os->read($need); |
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| 132 | 2 | View Code Duplication | if (false !== $bytes) { |
| 133 | 2 | $len = strlen($bytes); |
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| 134 | 2 | for ($i = 0; $i < $len; ++$i) { |
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| 135 | 2 | $c[] = self::$_byteMap[$bytes[$i]]; |
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| 136 | 2 | } |
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| 137 | 2 | } |
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| 138 | 2 | } |
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| 139 | |||
| 140 | 2 | $this->_array[] = $c; |
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| 141 | 2 | ++$this->_array_size; |
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| 142 | 2 | } |
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| 143 | 2 | } |
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| 144 | |||
| 145 | /** |
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| 146 | * Import a string a bytes into this CharacterStream, overwriting any existing |
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| 147 | * data in the stream. |
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| 148 | * |
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| 149 | * @param string $string |
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| 150 | */ |
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| 151 | 17 | public function importString($string) |
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| 156 | |||
| 157 | /** |
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| 158 | * Read $length characters from the stream and move the internal pointer |
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| 159 | * $length further into the stream. |
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| 160 | * |
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| 161 | * @param int $length |
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| 162 | * |
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| 163 | * @return false|string false on error |
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| 164 | */ |
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| 165 | 7 | public function read($length) |
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| 166 | { |
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| 167 | 7 | if ($this->_offset === $this->_array_size) { |
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| 168 | 6 | return false; |
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| 169 | } |
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| 170 | |||
| 171 | // Don't use array slice |
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| 172 | 6 | $arrays = array(); |
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| 173 | 6 | $end = $length + $this->_offset; |
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| 174 | 6 | View Code Duplication | for ($i = $this->_offset; $i < $end; ++$i) { |
| 175 | 6 | if (!isset($this->_array[$i])) { |
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| 176 | 2 | break; |
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| 177 | } |
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| 178 | 6 | $arrays[] = $this->_array[$i]; |
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| 179 | 6 | } |
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| 180 | |||
| 181 | 6 | $this->_offset += $i - $this->_offset; // Limit function calls |
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| 182 | |||
| 183 | 6 | $chars = false; |
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| 184 | 6 | foreach ($arrays as $array) { |
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| 185 | 6 | $chars .= implode('', array_map('chr', $array)); |
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| 186 | 6 | } |
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| 187 | |||
| 188 | 6 | return $chars; |
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| 189 | } |
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| 190 | |||
| 191 | /** |
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| 192 | * Read $length characters from the stream and return a 1-dimensional array |
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| 193 | * containing there octet values. |
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| 194 | * |
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| 195 | * @param int $length |
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| 196 | * |
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| 197 | * @return integer[] |
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| 198 | */ |
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| 199 | 9 | public function readBytes($length) |
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| 200 | { |
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| 201 | 9 | if ($this->_offset === $this->_array_size) { |
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| 202 | 9 | return false; |
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| 203 | } |
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| 204 | |||
| 205 | 9 | $arrays = array(); |
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| 206 | 9 | $end = $length + $this->_offset; |
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| 207 | 9 | View Code Duplication | for ($i = $this->_offset; $i < $end; ++$i) { |
| 208 | 9 | if (!isset($this->_array[$i])) { |
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| 209 | 8 | break; |
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| 210 | } |
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| 211 | 9 | $arrays[] = $this->_array[$i]; |
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| 212 | 9 | } |
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| 213 | |||
| 214 | 9 | $this->_offset += ($i - $this->_offset); // Limit function calls |
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| 215 | |||
| 216 | 9 | return call_user_func_array('array_merge', $arrays); |
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| 217 | } |
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| 218 | |||
| 219 | /** |
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| 220 | * Write $chars to the end of the stream. |
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| 221 | * |
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| 222 | * @param string $chars |
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| 223 | */ |
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| 224 | 17 | public function write($chars) |
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| 225 | { |
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| 226 | 17 | if (!isset($this->_charReader)) { |
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| 227 | 17 | $this->_charReader = $this->_charReaderFactory->getReaderFor($this->_charset); |
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| 228 | 17 | } |
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| 229 | |||
| 230 | 17 | $startLength = $this->_charReader->getInitialByteSize(); |
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| 231 | |||
| 232 | 17 | $fp = fopen('php://memory', 'w+b'); |
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| 233 | 17 | fwrite($fp, $chars); |
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| 234 | 17 | unset($chars); |
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| 235 | 17 | fseek($fp, 0, SEEK_SET); |
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| 236 | |||
| 237 | 17 | $buffer = array(0); |
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| 238 | 17 | $buf_pos = 1; |
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| 239 | 17 | $buf_len = 1; |
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| 240 | 17 | $has_datas = true; |
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| 241 | do { |
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| 242 | 17 | $bytes = array(); |
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| 243 | // Buffer Filing |
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| 244 | 17 | if ($buf_len - $buf_pos < $startLength) { |
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| 245 | 17 | $buf = array_splice($buffer, $buf_pos); |
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| 246 | 17 | $new = $this->_reloadBuffer($fp, 100); |
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| 247 | 17 | if ($new) { |
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| 248 | 17 | $buffer = array_merge($buf, $new); |
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| 249 | 17 | $buf_len = count($buffer); |
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| 250 | 17 | $buf_pos = 0; |
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| 251 | 17 | } else { |
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| 252 | 17 | $has_datas = false; |
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| 253 | } |
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| 254 | 17 | } |
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| 255 | 17 | if ($buf_len - $buf_pos > 0) { |
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| 256 | 17 | $size = 0; |
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| 257 | 17 | View Code Duplication | for ($i = 0; $i < $startLength && isset($buffer[$buf_pos]); ++$i) { |
| 258 | 17 | ++$size; |
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| 259 | 17 | $bytes[] = $buffer[$buf_pos++]; |
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| 260 | 17 | } |
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| 261 | 17 | $need = $this->_charReader->validateByteSequence( |
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| 262 | 17 | $bytes, $size |
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| 263 | 17 | ); |
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| 264 | 17 | if ($need > 0) { |
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| 265 | 11 | if ($buf_len - $buf_pos < $need) { |
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| 266 | 2 | $new = $this->_reloadBuffer($fp, $need); |
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| 267 | |||
| 268 | 2 | if ($new) { |
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| 269 | 2 | $buffer = array_merge($buffer, $new); |
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| 270 | 2 | $buf_len = count($buffer); |
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| 271 | 2 | } |
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| 272 | 2 | } |
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| 273 | 11 | View Code Duplication | for ($i = 0; $i < $need && isset($buffer[$buf_pos]); ++$i) { |
| 274 | 11 | $bytes[] = $buffer[$buf_pos++]; |
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| 275 | 11 | } |
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| 276 | 11 | } |
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| 277 | 17 | $this->_array[] = $bytes; |
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| 278 | 17 | ++$this->_array_size; |
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| 279 | 17 | } |
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| 280 | 17 | } while ($has_datas); |
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| 281 | |||
| 282 | 17 | fclose($fp); |
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| 283 | 17 | } |
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| 284 | |||
| 285 | /** |
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| 286 | * Move the internal pointer to $charOffset in the stream. |
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| 287 | * |
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| 288 | * @param int $charOffset |
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| 289 | */ |
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| 290 | 1 | public function setPointer($charOffset) |
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| 291 | { |
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| 292 | 1 | if ($charOffset > $this->_array_size) { |
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| 293 | $charOffset = $this->_array_size; |
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| 294 | 1 | } elseif ($charOffset < 0) { |
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| 295 | $charOffset = 0; |
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| 296 | } |
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| 297 | 1 | $this->_offset = $charOffset; |
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| 298 | 1 | } |
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| 299 | |||
| 300 | /** |
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| 301 | * Empty the stream and reset the internal pointer. |
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| 302 | */ |
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| 303 | 17 | public function flushContents() |
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| 309 | |||
| 310 | /** |
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| 311 | * @param resource $fp |
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| 312 | * @param int $len |
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| 313 | * |
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| 314 | * @return array|false false on error |
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| 315 | */ |
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| 316 | 17 | private function _reloadBuffer($fp, $len) |
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| 333 | |||
| 334 | 48 | private static function _initializeMaps() |
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| 344 | } |
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| 345 |
You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.