digiaonline /
graphql-php
| Total Complexity | 82 |
| Total Lines | 516 |
| Duplicated Lines | 0 % |
| Changes | 0 | ||
Complex classes like TokenReader 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.
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 TokenReader, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 7 | class TokenReader implements TokenReaderInterface |
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| 8 | { |
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| 9 | |||
| 10 | /** |
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| 11 | * The lexer owning this token reader. |
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| 12 | * |
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| 13 | * @var LexerInterface |
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| 14 | */ |
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| 15 | protected $lexer; |
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| 16 | |||
| 17 | /** |
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| 18 | * @inheritdoc |
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| 19 | */ |
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| 20 | public function setLexer(LexerInterface $lexer) |
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| 21 | { |
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| 22 | $this->lexer = $lexer; |
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| 23 | return $this; |
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| 24 | } |
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| 25 | |||
| 26 | /** |
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| 27 | * @inheritdoc |
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| 28 | */ |
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| 29 | public function getLexer(): LexerInterface |
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| 32 | } |
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| 33 | |||
| 34 | /** |
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| 35 | * @inheritdoc |
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| 36 | * @throws SyntaxErrorException |
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| 37 | */ |
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| 38 | public function read(string $body, int $bodyLength, int $code, int $pos, int $line, int $col, Token $prev): ?Token |
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| 39 | { |
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| 40 | switch ($code) { |
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| 41 | case 33: // ! |
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| 42 | return $this->readBang($pos, $line, $col, $prev); |
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| 43 | case 35: // # |
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| 44 | return $this->readComment($pos, $line, $col, $prev); |
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| 45 | case 36: // $ |
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| 46 | return $this->readDollar($pos, $line, $col, $prev); |
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| 47 | case 38: // & |
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| 48 | return $this->readAmp($pos, $line, $col, $prev); |
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| 49 | case 58: // : |
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| 50 | return $this->readColon($pos, $line, $col, $prev); |
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| 51 | case 61: // = |
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| 52 | return $this->readEquals($pos, $line, $col, $prev); |
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| 53 | case 64: // @ |
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| 54 | return $this->readAt($pos, $line, $col, $prev); |
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| 55 | case 124: // | |
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| 56 | return $this->readPipe($pos, $line, $col, $prev); |
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| 57 | case 40: |
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| 58 | case 41: // ( or )~ |
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| 59 | return $this->readParenthesis($code, $pos, $line, $col, $prev); |
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| 60 | case 91: |
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| 61 | case 93: // [ or ] |
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| 62 | return $this->readBracket($code, $pos, $line, $col, $prev); |
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| 63 | case 123: |
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| 64 | case 125: // { or } |
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| 65 | return $this->readBrace($code, $pos, $line, $col, $prev); |
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| 66 | } |
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| 67 | |||
| 68 | // Int: -?(0|[1-9][0-9]*) |
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| 69 | // Float: -?(0|[1-9][0-9]*)(\.[0-9]+)?((E|e)(+|-)?[0-9]+)? |
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| 70 | if ($code === 45 || isNumber($code)) { |
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| 71 | return $this->readNumber($code, $pos, $line, $col, $prev); |
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| 72 | } |
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| 73 | |||
| 74 | // Name: [_A-Za-z][_0-9A-Za-z]* |
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| 75 | if (isAlphaNumeric($code)) { |
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| 76 | return $this->readName($body, $bodyLength, $pos, $line, $col, $prev); |
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| 77 | } |
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| 78 | |||
| 79 | // Spread: ... |
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| 80 | if ($bodyLength >= 3 && isSpread($body, $code, $pos)) { |
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| 81 | return $this->readSpread($pos, $line, $col, $prev); |
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| 82 | } |
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| 83 | |||
| 84 | // String: "([^"\\\u000A\u000D]|(\\(u[0-9a-fA-F]{4}|["\\/bfnrt])))*" |
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| 85 | if (isString($body, $code, $pos)) { |
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| 86 | return $this->readString($body, $bodyLength, $pos, $line, $col, $prev); |
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| 87 | } |
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| 88 | |||
| 89 | // Block String: """("?"?(\\"""|\\(?!=""")|[^"\\]))*""" |
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| 90 | if ($bodyLength >= 3 && isTripleQuote($body, $code, $pos)) { |
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| 91 | return $this->readBlockString($body, $bodyLength, $pos, $line, $col, $prev); |
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| 92 | } |
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| 93 | |||
| 94 | return null; |
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| 95 | } |
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| 96 | |||
| 97 | /** |
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| 98 | * @param string $body |
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| 99 | * @param int $bodyLength |
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| 100 | * @param int $pos |
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| 101 | * @param int $line |
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| 102 | * @param int $col |
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| 103 | * @param Token $prev |
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| 104 | * @return Token |
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| 105 | */ |
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| 106 | protected function readName(string $body, int $bodyLength, int $pos, int $line, int $col, Token $prev): Token |
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| 107 | { |
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| 108 | $start = $pos; |
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| 109 | $pos = $start + 1; |
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| 110 | |||
| 111 | while ($pos !== $bodyLength && ($code = charCodeAt($body, $pos)) !== null && isAlphaNumeric($code)) { |
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| 112 | ++$pos; |
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| 113 | } |
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| 114 | |||
| 115 | return new Token(TokenKindEnum::NAME, $start, $pos, $line, $col, $prev, sliceString($body, $start, $pos)); |
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| 116 | } |
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| 117 | |||
| 118 | /** |
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| 119 | * @param string $body |
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| 120 | * @param int $bodyLength |
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| 121 | * @param int $pos |
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| 122 | * @param int $line |
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| 123 | * @param int $col |
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| 124 | * @param Token $prev |
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| 125 | * @return Token |
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| 126 | * @throws SyntaxErrorException |
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| 127 | */ |
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| 128 | protected function readBlockString(string $body, int $bodyLength, int $pos, int $line, int $col, Token $prev): Token |
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| 168 | } |
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| 169 | |||
| 170 | /** |
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| 171 | * @param int $code |
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| 172 | * @param int $pos |
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| 173 | * @param int $line |
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| 174 | * @param int $col |
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| 175 | * @param Token $prev |
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| 176 | * @return Token |
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| 177 | * @throws SyntaxErrorException |
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| 178 | */ |
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| 179 | protected function readNumber(int $code, int $pos, int $line, int $col, Token $prev): Token |
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| 234 | ); |
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| 235 | } |
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| 236 | |||
| 237 | /** |
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| 238 | * @param string $body |
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| 239 | * @param int $bodyLength |
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| 240 | * @param int $pos |
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| 241 | * @param int $line |
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| 242 | * @param int $col |
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| 243 | * @param Token $prev |
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| 244 | * @return Token |
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| 245 | * @throws SyntaxErrorException |
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| 246 | */ |
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| 247 | protected function readString(string $body, int $bodyLength, int $pos, int $line, int $col, Token $prev): Token |
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| 248 | { |
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| 249 | $start = $pos; |
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| 250 | $pos = $start + 1; |
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| 251 | $chunkStart = $pos; |
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| 252 | $value = ''; |
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| 253 | |||
| 254 | while ($pos < $bodyLength && ($code = charCodeAt($body, $pos)) !== null && !isLineTerminator($code)) { |
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| 255 | // Closing Quote (") |
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| 256 | if ($code === 34) { |
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| 257 | $value .= sliceString($body, $chunkStart, $pos); |
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| 258 | return new Token(TokenKindEnum::STRING, $start, $pos + 1, $line, $col, $prev, $value); |
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| 259 | } |
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| 260 | |||
| 261 | if (isSourceCharacter($code)) { |
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| 262 | throw new SyntaxErrorException( |
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| 263 | $this->lexer->getSource(), |
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| 264 | $pos, |
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| 265 | \sprintf('Invalid character within String: %s.', printCharCode($code)) |
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| 266 | ); |
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| 267 | } |
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| 268 | |||
| 269 | ++$pos; |
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| 270 | |||
| 271 | if ($code === 92) { |
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| 272 | // \ |
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| 273 | $value .= sliceString($body, $chunkStart, $pos - 1); |
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| 274 | $code = charCodeAt($body, $pos); |
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| 275 | |||
| 276 | switch ($code) { |
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| 277 | case 34: |
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| 278 | $value .= '"'; |
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| 279 | break; |
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| 280 | case 47: |
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| 281 | $value .= '/'; |
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| 282 | break; |
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| 283 | case 92: |
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| 284 | $value .= '\\'; |
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| 285 | break; |
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| 286 | case 98: |
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| 287 | $value .= '\b'; |
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| 288 | break; |
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| 289 | case 102: |
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| 290 | $value .= '\f'; |
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| 291 | break; |
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| 292 | case 110: |
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| 293 | $value .= '\n'; |
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| 294 | break; |
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| 295 | case 114: |
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| 296 | $value .= '\r'; |
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| 297 | break; |
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| 298 | case 116: |
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| 299 | $value .= '\t'; |
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| 300 | break; |
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| 301 | case 117: |
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| 302 | // u |
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| 303 | $unicodeString = sliceString($body, $pos + 1, $pos + 5); |
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| 304 | |||
| 305 | if (!\preg_match('/[0-9A-Fa-f]{4}/', $unicodeString)) { |
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| 306 | throw new SyntaxErrorException( |
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| 307 | $this->lexer->getSource(), |
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| 308 | $pos, |
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| 309 | \sprintf('Invalid character escape sequence: \\u%s.', $unicodeString) |
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| 310 | ); |
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| 311 | } |
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| 312 | |||
| 313 | $value .= '\\u' . $unicodeString; |
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| 314 | $pos += 4; |
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| 315 | break; |
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| 316 | default: |
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| 317 | throw new SyntaxErrorException( |
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| 318 | $this->lexer->getSource(), |
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| 319 | $pos, |
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| 320 | \sprintf('Invalid character escape sequence: \\%s.', \chr($code)) |
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| 321 | ); |
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| 322 | } |
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| 323 | |||
| 324 | ++$pos; |
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| 325 | |||
| 326 | $chunkStart = $pos; |
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| 327 | } |
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| 328 | } |
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| 329 | |||
| 330 | throw new SyntaxErrorException($this->lexer->getSource(), $pos, 'Unterminated string.'); |
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| 331 | } |
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| 332 | |||
| 333 | /** |
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| 334 | * @param int $pos |
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| 335 | * @param int $line |
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| 336 | * @param int $col |
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| 337 | * @param Token $prev |
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| 338 | * @return Token |
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| 339 | */ |
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| 340 | protected function readSpread(int $pos, int $line, int $col, Token $prev): Token |
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| 341 | { |
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| 342 | return new Token(TokenKindEnum::SPREAD, $pos, $pos + 3, $line, $col, $prev); |
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| 343 | } |
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| 344 | |||
| 345 | /** |
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| 346 | * @param int $pos |
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| 347 | * @param int $line |
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| 348 | * @param int $col |
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| 349 | * @param Token $prev |
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| 350 | * @return Token |
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| 351 | */ |
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| 352 | protected function readDollar(int $pos, int $line, int $col, Token $prev): Token |
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| 353 | { |
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| 354 | return new Token(TokenKindEnum::DOLLAR, $pos, $pos + 1, $line, $col, $prev); |
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| 355 | } |
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| 356 | |||
| 357 | /** |
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| 358 | * @param int $pos |
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| 359 | * @param int $line |
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| 360 | * @param int $col |
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| 361 | * @param Token $prev |
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| 362 | * @return Token |
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| 363 | */ |
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| 364 | protected function readPipe(int $pos, int $line, int $col, Token $prev): Token |
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| 365 | { |
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| 366 | return new Token(TokenKindEnum::PIPE, $pos, $pos + 1, $line, $col, $prev); |
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| 367 | } |
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| 368 | |||
| 369 | /** |
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| 370 | * @param int $code |
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| 371 | * @param int $pos |
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| 372 | * @param int $line |
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| 373 | * @param int $col |
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| 374 | * @param Token $prev |
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| 375 | * @return Token |
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| 376 | */ |
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| 377 | protected function readParenthesis(int $code, int $pos, int $line, int $col, Token $prev): Token |
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| 378 | { |
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| 379 | return $code === 40 |
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| 380 | ? new Token(TokenKindEnum::PAREN_L, $pos, $pos + 1, $line, $col, $prev) |
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| 381 | : new Token(TokenKindEnum::PAREN_R, $pos, $pos + 1, $line, $col, $prev); |
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| 382 | } |
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| 383 | |||
| 384 | /** |
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| 385 | * @param int $pos |
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| 386 | * @param int $line |
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| 387 | * @param int $col |
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| 388 | * @param Token $prev |
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| 389 | * @return Token |
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| 390 | */ |
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| 391 | protected function readEquals(int $pos, int $line, int $col, Token $prev): Token |
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| 392 | { |
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| 393 | return new Token(TokenKindEnum::EQUALS, $pos, $pos + 1, $line, $col, $prev); |
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| 394 | } |
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| 395 | |||
| 396 | /** |
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| 397 | * @param int $pos |
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| 398 | * @param int $line |
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| 399 | * @param int $col |
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| 400 | * @param Token $prev |
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| 401 | * @return Token |
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| 402 | */ |
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| 403 | protected function readAt(int $pos, int $line, int $col, Token $prev): Token |
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| 404 | { |
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| 405 | return new Token(TokenKindEnum::AT, $pos, $pos + 1, $line, $col, $prev); |
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| 406 | } |
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| 407 | |||
| 408 | /** |
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| 409 | * @param int $pos |
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| 410 | * @param int $line |
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| 411 | * @param int $col |
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| 412 | * @param Token $prev |
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| 413 | * @return Token |
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| 414 | */ |
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| 415 | protected function readComment(int $pos, int $line, int $col, Token $prev): Token |
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| 416 | { |
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| 417 | $body = $this->lexer->getBody(); |
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| 418 | $start = $pos; |
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| 419 | |||
| 420 | do { |
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| 421 | $code = charCodeAt($body, ++$pos); |
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| 422 | } while ($code !== null && ($code > 0x001f || $code === 0x0009)); // SourceCharacter but not LineTerminator |
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| 423 | |||
| 424 | return new Token( |
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| 425 | TokenKindEnum::COMMENT, |
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| 426 | $start, |
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| 427 | $pos, |
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| 428 | $line, |
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| 429 | $col, |
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| 430 | $prev, |
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| 431 | sliceString($body, $start + 1, $pos) |
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| 432 | ); |
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| 433 | } |
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| 434 | |||
| 435 | /** |
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| 436 | * @param int $pos |
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| 437 | * @param int $line |
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| 438 | * @param int $col |
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| 439 | * @param Token $prev |
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| 440 | * @return Token |
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| 441 | */ |
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| 442 | protected function readColon(int $pos, int $line, int $col, Token $prev): Token |
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| 443 | { |
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| 444 | return new Token(TokenKindEnum::COLON, $pos, $pos + 1, $line, $col, $prev); |
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| 445 | } |
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| 446 | |||
| 447 | /** |
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| 448 | * @param int $pos |
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| 449 | * @param int $line |
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| 450 | * @param int $col |
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| 451 | * @param Token $prev |
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| 452 | * @return Token |
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| 453 | */ |
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| 454 | protected function readAmp(int $pos, int $line, int $col, Token $prev): Token |
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| 455 | { |
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| 456 | return new Token(TokenKindEnum::AMP, $pos, $pos + 1, $line, $col, $prev); |
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| 457 | } |
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| 458 | |||
| 459 | /** |
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| 460 | * @param int $pos |
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| 461 | * @param int $line |
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| 462 | * @param int $col |
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| 463 | * @param Token $prev |
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| 464 | * @return Token |
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| 465 | */ |
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| 466 | protected function readBang(int $pos, int $line, int $col, Token $prev): Token |
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| 467 | { |
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| 468 | return new Token(TokenKindEnum::BANG, $pos, $pos + 1, $line, $col, $prev); |
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| 469 | } |
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| 470 | |||
| 471 | /** |
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| 472 | * @param int $code |
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| 473 | * @param int $pos |
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| 474 | * @param int $line |
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| 475 | * @param int $col |
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| 476 | * @param Token $prev |
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| 477 | * @return Token |
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| 478 | */ |
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| 479 | protected function readBrace(int $code, int $pos, int $line, int $col, Token $prev): Token |
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| 480 | { |
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| 481 | return $code === 123 |
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| 482 | ? new Token(TokenKindEnum::BRACE_L, $pos, $pos + 1, $line, $col, $prev) |
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| 483 | : new Token(TokenKindEnum::BRACE_R, $pos, $pos + 1, $line, $col, $prev); |
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| 484 | } |
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| 485 | |||
| 486 | /** |
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| 487 | * @param int $code |
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| 488 | * @param int $pos |
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| 489 | * @param int $line |
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| 490 | * @param int $col |
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| 491 | * @param Token $prev |
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| 492 | * @return Token |
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| 493 | */ |
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| 494 | protected function readBracket(int $code, int $pos, int $line, int $col, Token $prev): Token |
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| 499 | } |
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| 500 | |||
| 501 | /** |
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| 502 | * @param int $code |
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| 503 | * @param int $pos |
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| 504 | * @return int |
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| 505 | * @throws SyntaxErrorException |
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| 506 | */ |
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| 507 | protected function readDigits(int $code, int $pos): int |
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| 523 | ); |
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| 524 | } |
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| 525 | } |
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| 526 |
