Complex classes like Str 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 Str, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 9 | class Str implements PrimitiveInterface, StringableInterface |
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| 10 | { |
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| 11 | const PAD_RIGHT = STR_PAD_RIGHT; |
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| 12 | const PAD_LEFT = STR_PAD_LEFT; |
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| 13 | const PAD_BOTH = STR_PAD_BOTH; |
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| 14 | const PREG_NO_FLAGS = 0; |
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| 15 | const PREG_SPLIT_NO_EMPTY = PREG_SPLIT_NO_EMPTY; |
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| 16 | const PREG_SPLIT_DELIM_CAPTURE = PREG_SPLIT_DELIM_CAPTURE; |
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| 17 | const PREG_SPLIT_OFFSET_CAPTURE = PREG_SPLIT_OFFSET_CAPTURE; |
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| 18 | const PREG_OFFSET_CAPTURE = PREG_OFFSET_CAPTURE; |
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| 19 | |||
| 20 | private $value; |
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| 21 | |||
| 22 | 290 | public function __construct(string $value) |
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| 26 | |||
| 27 | /** |
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| 28 | * {@inheritdoc} |
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| 29 | */ |
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| 30 | 2 | public function toPrimitive() |
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| 34 | |||
| 35 | /** |
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| 36 | * {@inheritdoc} |
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| 37 | */ |
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| 38 | 184 | public function __toString(): string |
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| 42 | |||
| 43 | /** |
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| 44 | * Split the string into a collection of ones |
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| 45 | * |
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| 46 | * @param string $delimiter |
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| 47 | * |
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| 48 | * @return StreamInterface<self> |
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| 49 | */ |
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| 50 | 4 | public function split(string $delimiter = null): StreamInterface |
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| 51 | { |
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| 52 | 4 | $parts = empty($delimiter) ? |
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| 53 | 4 | str_split($this->value) : explode($delimiter, $this->value); |
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| 54 | 4 | $stream = new Stream(self::class); |
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| 55 | |||
| 56 | 4 | foreach ($parts as $part) { |
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| 57 | 4 | $stream = $stream->add(new self($part)); |
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| 58 | } |
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| 59 | |||
| 60 | 4 | return $stream; |
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| 61 | } |
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| 62 | |||
| 63 | /** |
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| 64 | * Returns a collection of the string splitted by the given chunk size |
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| 65 | * |
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| 66 | * @param int $size |
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| 67 | * |
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| 68 | * @return StreamInterface<self> |
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| 69 | */ |
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| 70 | 2 | public function chunk(int $size = 1): StreamInterface |
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| 71 | { |
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| 72 | 2 | $pieces = str_split($this->value, $size); |
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| 73 | 2 | $stream = new Stream(self::class); |
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| 74 | |||
| 75 | 2 | foreach ($pieces as $piece) { |
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| 76 | 2 | $stream = $stream->add(new self($piece)); |
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| 77 | } |
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| 78 | |||
| 79 | 2 | return $stream; |
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| 80 | } |
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| 81 | |||
| 82 | /** |
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| 83 | * Returns the position of the first occurence of the string |
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| 84 | * |
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| 85 | * @param string $needle |
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| 86 | * @param int $offset |
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| 87 | * |
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| 88 | * @throws SubstringException If the string is not found |
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| 89 | * |
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| 90 | * @return int |
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| 91 | */ |
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| 92 | 8 | public function position(string $needle, int $offset = 0): int |
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| 93 | { |
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| 94 | 8 | $position = mb_strpos($this->value, $needle, $offset); |
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| 95 | |||
| 96 | 8 | if ($position === false) { |
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| 97 | 4 | throw new SubstringException(sprintf( |
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| 98 | 4 | 'Substring "%s" not found', |
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| 99 | $needle |
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| 100 | )); |
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| 101 | } |
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| 102 | |||
| 103 | 6 | return (int) $position; |
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| 104 | } |
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| 105 | |||
| 106 | /** |
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| 107 | * Replace all occurences of the search string with the replacement one |
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| 108 | * |
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| 109 | * @param string $search |
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| 110 | * @param string $replacement |
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| 111 | * |
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| 112 | * @return self |
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| 113 | */ |
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| 114 | 2 | public function replace(string $search, string $replacement): self |
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| 122 | |||
| 123 | /** |
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| 124 | * Returns the string following the given delimiter |
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| 125 | * |
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| 126 | * @param string $delimiter |
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| 127 | * |
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| 128 | * @throws SubstringException If the string is not found |
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| 129 | * |
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| 130 | * @return self |
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| 131 | */ |
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| 132 | 4 | public function str(string $delimiter): self |
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| 133 | { |
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| 134 | 4 | $sub = mb_strstr($this->value, $delimiter); |
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| 135 | |||
| 136 | 4 | if ($sub === false) { |
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| 137 | 2 | throw new SubstringException(sprintf( |
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| 138 | 2 | 'Substring "%s" not found', |
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| 139 | $delimiter |
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| 140 | )); |
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| 141 | } |
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| 142 | |||
| 143 | 2 | return new self($sub); |
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| 144 | } |
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| 145 | |||
| 146 | /** |
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| 147 | * Return the string in upper case |
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| 148 | * |
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| 149 | * @return self |
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| 150 | */ |
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| 151 | 2 | public function toUpper(): self |
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| 155 | |||
| 156 | /** |
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| 157 | * Return the string in lower case |
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| 158 | * |
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| 159 | * @return self |
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| 160 | */ |
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| 161 | 2 | public function toLower(): self |
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| 165 | |||
| 166 | /** |
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| 167 | * Return the string length |
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| 168 | * |
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| 169 | * @return int |
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| 170 | */ |
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| 171 | 4 | public function length(): int |
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| 175 | |||
| 176 | /** |
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| 177 | * Reverse the string |
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| 178 | * |
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| 179 | * @return self |
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| 180 | */ |
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| 181 | 2 | public function reverse(): self |
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| 185 | |||
| 186 | /** |
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| 187 | * Pad to the right |
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| 188 | * |
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| 189 | * @param int $length |
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| 190 | * @param string $character |
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| 191 | * |
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| 192 | * @return self |
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| 193 | */ |
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| 194 | 2 | public function rightPad(int $length, string $character = ' '): self |
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| 198 | |||
| 199 | /** |
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| 200 | * Pad to the left |
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| 201 | * |
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| 202 | * @param int $length |
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| 203 | * @param string $character |
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| 204 | * |
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| 205 | * @return self |
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| 206 | */ |
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| 207 | 2 | public function leftPad(int $length, string $character = ' '): self |
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| 211 | |||
| 212 | /** |
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| 213 | * Pad both sides |
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| 214 | * |
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| 215 | * @param int $length |
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| 216 | * @param string $character |
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| 217 | * |
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| 218 | * @return self |
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| 219 | */ |
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| 220 | 2 | public function uniPad(int $length, string $character = ' '): self |
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| 224 | |||
| 225 | /** |
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| 226 | * Find length of initial segment not matching mask |
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| 227 | * |
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| 228 | * @param string $mask |
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| 229 | * @param int $start |
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| 230 | * @param int $length |
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| 231 | * |
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| 232 | * @return int |
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| 233 | */ |
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| 234 | 2 | public function cspn(string $mask, int $start = 0, int $length = null): int |
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| 235 | { |
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| 236 | 2 | if ($length === null) { |
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| 237 | 2 | $value = strcspn($this->value, $mask, $start); |
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| 238 | } else { |
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| 239 | 2 | $value = strcspn( |
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| 240 | 2 | $this->value, |
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| 241 | $mask, |
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| 242 | $start, |
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| 243 | $length |
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| 244 | ); |
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| 245 | } |
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| 246 | |||
| 247 | 2 | return (int) $value; |
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| 248 | } |
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| 249 | |||
| 250 | /** |
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| 251 | * Repeat the string n times |
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| 252 | * |
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| 253 | * @param int $repeat |
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| 254 | * |
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| 255 | * @return self |
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| 256 | */ |
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| 257 | 2 | public function repeat(int $repeat): self |
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| 261 | |||
| 262 | /** |
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| 263 | * Shuffle the string |
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| 264 | * |
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| 265 | * @return self |
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| 266 | */ |
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| 267 | 2 | public function shuffle(): self |
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| 271 | |||
| 272 | /** |
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| 273 | * Strip slashes |
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| 274 | * |
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| 275 | * @return self |
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| 276 | */ |
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| 277 | 2 | public function stripSlashes(): self |
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| 281 | |||
| 282 | /** |
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| 283 | * Strip C-like slashes |
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| 284 | * |
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| 285 | * @return self |
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| 286 | */ |
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| 287 | 2 | public function stripCSlashes(): self |
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| 291 | |||
| 292 | /** |
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| 293 | * Return the word count |
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| 294 | * |
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| 295 | * @param string $charlist |
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| 296 | * |
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| 297 | * @return int |
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| 298 | */ |
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| 299 | 2 | public function wordCount(string $charlist = ''): int |
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| 307 | |||
| 308 | /** |
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| 309 | * Return the collection of words |
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| 310 | * |
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| 311 | * @param string $charlist |
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| 312 | * |
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| 313 | * @return MapInterface<int, self> |
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| 314 | */ |
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| 315 | 2 | public function words(string $charlist = ''): MapInterface |
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| 326 | |||
| 327 | /** |
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| 328 | * Split the string using a regular expression |
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| 329 | * |
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| 330 | * @param string $regex |
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| 331 | * @param int $limit |
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| 332 | * |
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| 333 | * @return StreamInterface<self> |
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| 334 | */ |
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| 335 | 4 | public function pregSplit(string $regex, int $limit = -1): StreamInterface |
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| 346 | |||
| 347 | /** |
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| 348 | * Check if the string match the given regular expression |
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| 349 | * |
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| 350 | * @param string $regex |
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| 351 | * @param int $offset |
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| 352 | * |
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| 353 | * @throws Exception If the regex failed |
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| 354 | * |
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| 355 | * @return bool |
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| 356 | */ |
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| 357 | 4 | public function matches(string $regex, int $offset = 0): bool |
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| 368 | |||
| 369 | /** |
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| 370 | * Return a collection of the elements matching the regex |
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| 371 | * |
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| 372 | * @deprecated replaced by self::capture, to be removed in 3.0 |
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| 373 | * |
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| 374 | * @param string $regex |
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| 375 | * @param int $offset |
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| 376 | * @param int $flags |
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| 377 | * |
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| 378 | * @throws Exception If the regex failed |
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| 379 | * |
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| 380 | * @return MapInterface<scalar, self> |
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| 381 | */ |
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| 382 | 2 | public function getMatches( |
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| 389 | |||
| 390 | /** |
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| 391 | * Return a collection of the elements matching the regex |
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| 392 | * |
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| 393 | * @param string $regex |
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| 394 | * @param int $offset |
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| 395 | * @param int $flags |
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| 396 | * |
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| 397 | * @throws Exception If the regex failed |
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| 398 | * |
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| 399 | * @return MapInterface<scalar, self> |
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| 400 | */ |
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| 401 | 6 | public function capture( |
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| 426 | |||
| 427 | /** |
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| 428 | * Replace part of the string by using a regular expression |
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| 429 | * |
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| 430 | * @param string $regex |
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| 431 | * @param string $replacement |
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| 432 | * @param int $limit |
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| 433 | * |
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| 434 | * @throws Exception If the regex failed |
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| 435 | * |
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| 436 | * @return self |
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| 437 | */ |
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| 438 | 2 | public function pregReplace( |
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| 456 | |||
| 457 | /** |
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| 458 | * Return part of the string |
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| 459 | * |
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| 460 | * @param int $start |
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| 461 | * @param int $length |
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| 462 | * |
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| 463 | * @return self |
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| 464 | */ |
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| 465 | 2 | public function substring(int $start, int $length = null): self |
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| 475 | |||
| 476 | /** |
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| 477 | * Return a formatted string |
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| 478 | * |
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| 479 | * @return self |
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| 480 | */ |
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| 481 | 2 | public function sprintf(...$values): self |
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| 488 | |||
| 489 | /** |
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| 490 | * Return the string with the first letter as uppercase |
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| 491 | * |
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| 492 | * @return self |
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| 493 | */ |
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| 494 | 4 | public function ucfirst(): self |
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| 498 | |||
| 499 | /** |
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| 500 | * Return the string with the first letter as lowercase |
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| 501 | * |
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| 502 | * @return self |
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| 503 | */ |
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| 504 | 2 | public function lcfirst(): self |
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| 508 | |||
| 509 | /** |
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| 510 | * Return a CamelCase representation of the string |
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| 511 | * |
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| 512 | * @return self |
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| 513 | */ |
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| 514 | 2 | public function camelize(): self |
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| 525 | |||
| 526 | /** |
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| 527 | * Append a string at the end of the current one |
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| 528 | * |
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| 529 | * @param string $string |
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| 530 | * |
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| 531 | * @return self |
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| 532 | */ |
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| 533 | 2 | public function append(string $string): self |
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| 537 | |||
| 538 | /** |
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| 539 | * Prepend a string at the beginning of the current one |
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| 540 | * |
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| 541 | * @param string $string |
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| 542 | * |
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| 543 | * @return self |
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| 544 | */ |
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| 545 | 2 | public function prepend(string $string): self |
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| 549 | |||
| 550 | /** |
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| 551 | * Check if the 2 strings are equal |
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| 552 | * |
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| 553 | * @param self $string |
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| 554 | * |
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| 555 | * @return bool |
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| 556 | */ |
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| 557 | 56 | public function equals(self $string): bool |
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| 561 | |||
| 562 | /** |
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| 563 | * Trim the string |
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| 564 | * |
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| 565 | * @param string $mask |
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| 566 | * |
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| 567 | * @return self |
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| 568 | */ |
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| 569 | 2 | public function trim(string $mask = null): self |
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| 575 | |||
| 576 | /** |
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| 577 | * Trim the right side of the string |
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| 578 | * |
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| 579 | * @param string $mask |
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| 580 | * |
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| 581 | * @return self |
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| 582 | */ |
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| 583 | 2 | public function rightTrim(string $mask = null): self |
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| 589 | |||
| 590 | /** |
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| 591 | * Trim the left side of the string |
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| 592 | * |
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| 593 | * @param string $mask |
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| 594 | * |
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| 595 | * @return self |
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| 596 | */ |
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| 597 | 2 | public function leftTrim(string $mask = null): self |
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| 603 | |||
| 604 | /** |
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| 605 | * Check if the given string is present in the current one |
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| 606 | * |
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| 607 | * @param string $value |
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| 608 | * |
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| 609 | * @return bool |
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| 610 | */ |
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| 611 | 2 | public function contains(string $value): bool |
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| 621 | |||
| 622 | /** |
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| 623 | * Quote regular expression characters |
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| 624 | * |
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| 625 | * @param string $delimiter |
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| 626 | * |
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| 627 | * @return self |
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| 628 | */ |
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| 629 | 2 | public function pregQuote(string $delimiter = ''): self |
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| 633 | |||
| 634 | /** |
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| 635 | * Pad the string |
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| 636 | * |
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| 637 | * @param int $length |
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| 638 | * @param string $character |
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| 639 | * @param int $direction |
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| 640 | * |
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| 641 | * @return self |
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| 642 | */ |
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| 643 | 2 | private function pad( |
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| 655 | } |
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| 656 |
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