digiaonline /
graphql-php
| Total Complexity | 82 |
| Total Lines | 519 |
| 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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| 129 | { |
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| 130 | $start = $pos; |
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| 131 | $pos = $start + 3; |
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| 132 | $chunkStart = $pos; |
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| 133 | $rawValue = ''; |
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| 134 | |||
| 135 | while ($pos < $bodyLength && ($code = charCodeAt($body, $pos)) !== null) { |
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| 136 | // Closing Triple-Quote (""") |
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| 137 | if (isTripleQuote($body, $code, $pos)) { |
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| 138 | $rawValue .= sliceString($body, $chunkStart, $pos); |
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| 139 | return new Token( |
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| 140 | TokenKindEnum::BLOCK_STRING, |
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| 141 | $start, |
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| 142 | $pos + 3, |
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| 143 | $line, |
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| 144 | $col, |
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| 145 | $prev, |
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| 146 | blockStringValue($rawValue) |
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| 147 | ); |
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| 148 | } |
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| 149 | |||
| 150 | if (isSourceCharacter($code) && !isLineTerminator($code)) { |
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| 151 | throw new SyntaxErrorException( |
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| 152 | $this->lexer->getSource(), |
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| 153 | $pos, |
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| 154 | \sprintf('Invalid character within String: %s', printCharCode($code)) |
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| 155 | ); |
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| 156 | } |
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| 157 | |||
| 158 | if (isEscapedTripleQuote($body, $code, $pos)) { |
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| 159 | $rawValue .= sliceString($body, $chunkStart, $pos) . '"""'; |
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| 160 | $pos += 4; |
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| 161 | $chunkStart = $pos; |
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| 162 | } else { |
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| 163 | ++$pos; |
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| 164 | } |
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| 165 | } |
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| 166 | |||
| 167 | throw new SyntaxErrorException($this->lexer->getSource(), $pos, 'Unterminated string.'); |
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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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| 180 | { |
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| 181 | $body = $this->lexer->getBody(); |
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| 182 | $start = $pos; |
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| 183 | $isFloat = false; |
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| 184 | |||
| 185 | if ($code === 45) { |
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| 186 | // - |
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| 187 | $code = charCodeAt($body, ++$pos); |
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| 188 | } |
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| 189 | |||
| 190 | if ($code === 48) { |
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| 191 | // 0 |
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| 192 | $code = charCodeAt($body, ++$pos); |
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| 193 | if (isNumber($code)) { |
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| 194 | throw new SyntaxErrorException( |
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| 195 | $this->lexer->getSource(), |
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| 196 | $pos, |
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| 197 | \sprintf('Invalid number, unexpected digit after 0: %s.', printCharCode($code)) |
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| 198 | ); |
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| 199 | } |
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| 200 | } else { |
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| 201 | $pos = $this->readDigits($code, $pos); |
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| 202 | $code = charCodeAt($body, $pos); |
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| 203 | } |
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| 204 | |||
| 205 | if ($code === 46) { |
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| 206 | // . |
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| 207 | $isFloat = true; |
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| 208 | $code = charCodeAt($body, ++$pos); |
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| 209 | $pos = $this->readDigits($code, $pos); |
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| 210 | $code = charCodeAt($body, $pos); |
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| 211 | } |
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| 212 | |||
| 213 | if ($code === 69 || $code === 101) { |
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| 214 | // e or E |
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| 215 | $isFloat = true; |
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| 216 | $code = charCodeAt($body, ++$pos); |
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| 217 | |||
| 218 | if ($code === 43 || $code === 45) { |
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| 219 | // + or - |
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| 220 | $code = charCodeAt($body, ++$pos); |
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| 221 | } |
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| 222 | |||
| 223 | $pos = $this->readDigits($code, $pos); |
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| 224 | } |
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| 225 | |||
| 226 | return new Token( |
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| 227 | $isFloat ? TokenKindEnum::FLOAT : TokenKindEnum::INT, |
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| 228 | $start, |
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| 229 | $pos, |
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| 230 | $line, |
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| 231 | $col, |
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| 232 | $prev, |
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| 233 | sliceString($body, $start, $pos) |
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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 | $value = ''; |
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| 253 | while ($pos < $bodyLength && ($code = charCodeAt($body, $pos)) !== null && !isLineTerminator($code)) { |
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| 254 | // Closing Quote (") |
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| 255 | if ($code === 34) { |
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| 256 | $value .= sliceString($body, $chunkStart, $pos); |
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| 257 | return new Token(TokenKindEnum::STRING, $start, $pos + 1, $line, $col, $prev, $value); |
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| 258 | } |
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| 259 | |||
| 260 | if (isSourceCharacter($code)) { |
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| 261 | throw new SyntaxErrorException( |
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| 262 | $this->lexer->getSource(), |
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| 263 | $pos, |
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| 264 | \sprintf('Invalid character within String: %s', printCharCode($code)) |
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| 265 | ); |
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| 266 | } |
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| 267 | |||
| 268 | ++$pos; |
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| 269 | |||
| 270 | if ($code === 92) { |
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| 271 | // \ |
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| 272 | $value .= sliceString($body, $chunkStart, $pos - 1); |
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| 273 | $code = charCodeAt($body, $pos); |
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| 274 | |||
| 275 | switch ($code) { |
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| 276 | case 34: |
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| 277 | $value .= '"'; |
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| 278 | break; |
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| 279 | case 47: |
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| 280 | $value .= '/'; |
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| 281 | break; |
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| 282 | case 92: |
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| 283 | $value .= '\\'; |
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| 284 | break; |
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| 285 | case 98: |
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| 286 | $value .= '\b'; |
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| 287 | break; |
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| 288 | case 102: |
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| 289 | $value .= '\f'; |
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| 290 | break; |
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| 291 | case 110: |
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| 292 | $value .= '\n'; |
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| 293 | break; |
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| 294 | case 114: |
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| 295 | $value .= '\r'; |
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| 296 | break; |
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| 297 | case 116: |
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| 298 | $value .= '\t'; |
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| 299 | break; |
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| 300 | case 117: |
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| 301 | // u |
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| 302 | $unicodeString = sliceString($body, $pos - 1, $pos + 5); |
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| 303 | $charCode = uniCharCode( |
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| 304 | charCodeAt($body, $pos + 1), |
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| 305 | charCodeAt($body, $pos + 2), |
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| 306 | charCodeAt($body, $pos + 3), |
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| 307 | charCodeAt($body, $pos + 4) |
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| 308 | ); |
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| 309 | if ($charCode < 0) { |
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| 310 | throw new SyntaxErrorException( |
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| 311 | $this->lexer->getSource(), |
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| 312 | $pos, |
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| 313 | \sprintf('Invalid character escape sequence: %s.', $unicodeString) |
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| 314 | ); |
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| 315 | } |
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| 316 | $value .= $unicodeString; |
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| 317 | $pos += 4; |
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| 318 | break; |
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| 319 | default: |
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| 320 | throw new SyntaxErrorException( |
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| 321 | $this->lexer->getSource(), |
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| 322 | $pos, |
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| 323 | \sprintf('Invalid character escape sequence: \\%s.', \chr($code)) |
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| 324 | ); |
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| 325 | } |
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| 326 | |||
| 327 | ++$pos; |
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| 328 | |||
| 329 | $chunkStart = $pos; |
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| 330 | } |
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| 331 | } |
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| 332 | |||
| 333 | throw new SyntaxErrorException($this->lexer->getSource(), $pos, 'Unterminated string.'); |
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| 334 | } |
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| 335 | |||
| 336 | /** |
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| 337 | * @param int $pos |
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| 338 | * @param int $line |
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| 339 | * @param int $col |
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| 340 | * @param Token $prev |
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| 341 | * @return Token |
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| 342 | */ |
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| 343 | protected function readSpread(int $pos, int $line, int $col, Token $prev): Token |
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| 344 | { |
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| 345 | return new Token(TokenKindEnum::SPREAD, $pos, $pos + 3, $line, $col, $prev); |
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| 346 | } |
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| 347 | |||
| 348 | /** |
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| 349 | * @param int $pos |
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| 350 | * @param int $line |
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| 351 | * @param int $col |
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| 352 | * @param Token $prev |
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| 353 | * @return Token |
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| 354 | */ |
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| 355 | protected function readDollar(int $pos, int $line, int $col, Token $prev): Token |
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| 356 | { |
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| 357 | return new Token(TokenKindEnum::DOLLAR, $pos, $pos + 1, $line, $col, $prev); |
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| 358 | } |
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| 359 | |||
| 360 | /** |
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| 361 | * @param int $pos |
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| 362 | * @param int $line |
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| 363 | * @param int $col |
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| 364 | * @param Token $prev |
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| 365 | * @return Token |
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| 366 | */ |
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| 367 | protected function readPipe(int $pos, int $line, int $col, Token $prev): Token |
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| 368 | { |
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| 369 | return new Token(TokenKindEnum::PIPE, $pos, $pos + 1, $line, $col, $prev); |
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| 370 | } |
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| 371 | |||
| 372 | /** |
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| 373 | * @param int $code |
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| 374 | * @param int $pos |
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| 375 | * @param int $line |
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| 376 | * @param int $col |
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| 377 | * @param Token $prev |
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| 378 | * @return Token |
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| 379 | */ |
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| 380 | protected function readParenthesis(int $code, int $pos, int $line, int $col, Token $prev): Token |
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| 381 | { |
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| 382 | return $code === 40 |
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| 383 | ? new Token(TokenKindEnum::PAREN_L, $pos, $pos + 1, $line, $col, $prev) |
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| 384 | : new Token(TokenKindEnum::PAREN_R, $pos, $pos + 1, $line, $col, $prev); |
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| 385 | } |
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| 386 | |||
| 387 | /** |
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| 388 | * @param int $pos |
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| 389 | * @param int $line |
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| 390 | * @param int $col |
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| 391 | * @param Token $prev |
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| 392 | * @return Token |
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| 393 | */ |
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| 394 | protected function readEquals(int $pos, int $line, int $col, Token $prev): Token |
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| 395 | { |
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| 396 | return new Token(TokenKindEnum::EQUALS, $pos, $pos + 1, $line, $col, $prev); |
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| 397 | } |
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| 398 | |||
| 399 | /** |
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| 400 | * @param int $pos |
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| 401 | * @param int $line |
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| 402 | * @param int $col |
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| 403 | * @param Token $prev |
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| 404 | * @return Token |
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| 405 | */ |
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| 406 | protected function readAt(int $pos, int $line, int $col, Token $prev): Token |
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| 407 | { |
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| 408 | return new Token(TokenKindEnum::AT, $pos, $pos + 1, $line, $col, $prev); |
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| 409 | } |
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| 410 | |||
| 411 | /** |
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| 412 | * @param int $pos |
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| 413 | * @param int $line |
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| 414 | * @param int $col |
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| 415 | * @param Token $prev |
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| 416 | * @return Token |
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| 417 | */ |
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| 418 | protected function readComment(int $pos, int $line, int $col, Token $prev): Token |
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| 419 | { |
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| 420 | $body = $this->lexer->getBody(); |
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| 421 | $start = $pos; |
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| 422 | |||
| 423 | do { |
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| 424 | $code = charCodeAt($body, ++$pos); |
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| 425 | } while ($code !== null && ($code > 0x001f || $code === 0x0009)); // SourceCharacter but not LineTerminator |
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| 426 | |||
| 427 | return new Token( |
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| 428 | TokenKindEnum::COMMENT, |
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| 429 | $start, |
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| 430 | $pos, |
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| 431 | $line, |
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| 432 | $col, |
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| 433 | $prev, |
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| 434 | sliceString($body, $start + 1, $pos) |
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| 435 | ); |
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| 436 | } |
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| 437 | |||
| 438 | /** |
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| 439 | * @param int $pos |
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| 440 | * @param int $line |
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| 441 | * @param int $col |
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| 442 | * @param Token $prev |
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| 443 | * @return Token |
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| 444 | */ |
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| 445 | protected function readColon(int $pos, int $line, int $col, Token $prev): Token |
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| 446 | { |
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| 447 | return new Token(TokenKindEnum::COLON, $pos, $pos + 1, $line, $col, $prev); |
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| 448 | } |
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| 449 | |||
| 450 | /** |
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| 451 | * @param int $pos |
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| 452 | * @param int $line |
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| 453 | * @param int $col |
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| 454 | * @param Token $prev |
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| 455 | * @return Token |
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| 456 | */ |
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| 457 | protected function readAmp(int $pos, int $line, int $col, Token $prev): Token |
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| 458 | { |
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| 459 | return new Token(TokenKindEnum::AMP, $pos, $pos + 1, $line, $col, $prev); |
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| 460 | } |
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| 461 | |||
| 462 | /** |
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| 463 | * @param int $pos |
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| 464 | * @param int $line |
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| 465 | * @param int $col |
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| 466 | * @param Token $prev |
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| 467 | * @return Token |
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| 468 | */ |
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| 469 | protected function readBang(int $pos, int $line, int $col, Token $prev): Token |
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| 470 | { |
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| 471 | return new Token(TokenKindEnum::BANG, $pos, $pos + 1, $line, $col, $prev); |
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| 472 | } |
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| 473 | |||
| 474 | /** |
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| 475 | * @param int $code |
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| 476 | * @param int $pos |
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| 477 | * @param int $line |
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| 478 | * @param int $col |
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| 479 | * @param Token $prev |
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| 480 | * @return Token |
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| 481 | */ |
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| 482 | protected function readBrace(int $code, int $pos, int $line, int $col, Token $prev): Token |
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| 483 | { |
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| 484 | return $code === 123 |
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| 485 | ? new Token(TokenKindEnum::BRACE_L, $pos, $pos + 1, $line, $col, $prev) |
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| 486 | : new Token(TokenKindEnum::BRACE_R, $pos, $pos + 1, $line, $col, $prev); |
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| 487 | } |
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| 488 | |||
| 489 | /** |
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| 490 | * @param int $code |
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| 491 | * @param int $pos |
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| 492 | * @param int $line |
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| 493 | * @param int $col |
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| 494 | * @param Token $prev |
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| 495 | * @return Token |
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| 496 | */ |
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| 497 | protected function readBracket(int $code, int $pos, int $line, int $col, Token $prev): Token |
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| 502 | } |
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| 503 | |||
| 504 | /** |
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| 505 | * @param int $code |
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| 506 | * @param int $pos |
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| 507 | * @return int |
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| 508 | * @throws SyntaxErrorException |
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| 509 | */ |
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| 510 | protected function readDigits(int $code, int $pos): int |
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| 511 | { |
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| 512 | $body = $this->lexer->getBody(); |
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| 513 | |||
| 526 | ); |
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| 527 | } |
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| 528 | } |
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| 529 |
