digiaonline /
graphql-php
| Total Complexity | 100 |
| Total Lines | 656 |
| Duplicated Lines | 0 % |
| Changes | 0 | ||
Complex classes like Lexer 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 Lexer, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 8 | class Lexer implements LexerInterface |
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| 9 | { |
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| 10 | /** |
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| 11 | * A map between character code and the corresponding token kind. |
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| 12 | * |
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| 13 | * @var array |
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| 14 | */ |
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| 15 | protected static $codeTokenKindMap = [ |
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| 16 | 33 => TokenKindEnum::BANG, |
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| 17 | 36 => TokenKindEnum::DOLLAR, |
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| 18 | 38 => TokenKindEnum::AMP, |
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| 19 | 58 => TokenKindEnum::COLON, |
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| 20 | 61 => TokenKindEnum::EQUALS, |
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| 21 | 64 => TokenKindEnum::AT, |
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| 22 | 124 => TokenKindEnum::PIPE, |
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| 23 | 40 => TokenKindEnum::PAREN_L, |
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| 24 | 41 => TokenKindEnum::PAREN_R, |
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| 25 | 91 => TokenKindEnum::BRACKET_L, |
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| 26 | 93 => TokenKindEnum::BRACKET_R, |
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| 27 | 123 => TokenKindEnum::BRACE_L, |
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| 28 | 125 => TokenKindEnum::BRACE_R, |
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| 29 | ]; |
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| 30 | |||
| 31 | /** |
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| 32 | * TODO: Document this |
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| 33 | * |
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| 34 | * @var Source|null |
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| 35 | */ |
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| 36 | protected $source; |
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| 37 | |||
| 38 | /** |
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| 39 | * TODO: Document this |
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| 40 | * |
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| 41 | * @var string|null |
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| 42 | */ |
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| 43 | protected $body; |
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| 44 | |||
| 45 | /** |
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| 46 | * TODO: Document this |
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| 47 | * |
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| 48 | * @var int |
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| 49 | */ |
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| 50 | protected $bodyLength; |
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| 51 | |||
| 52 | /** |
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| 53 | * @var array |
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| 54 | */ |
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| 55 | protected $options = []; |
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| 56 | |||
| 57 | /** |
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| 58 | * The previously focused non-ignored token. |
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| 59 | * |
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| 60 | * @var Token |
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| 61 | */ |
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| 62 | protected $lastToken; |
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| 63 | |||
| 64 | /** |
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| 65 | * The currently focused non-ignored token. |
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| 66 | * |
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| 67 | * @var Token |
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| 68 | */ |
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| 69 | protected $token; |
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| 70 | |||
| 71 | /** |
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| 72 | * TODO: Document this |
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| 73 | * |
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| 74 | * @var int |
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| 75 | */ |
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| 76 | protected $pos; |
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| 77 | |||
| 78 | /** |
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| 79 | * The (1-indexed) line containing the current token. |
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| 80 | * |
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| 81 | * @var int |
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| 82 | */ |
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| 83 | protected $line; |
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| 84 | |||
| 85 | /** |
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| 86 | * The character offset at which the current line begins. |
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| 87 | * |
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| 88 | * @var int |
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| 89 | */ |
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| 90 | protected $lineStart; |
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| 91 | |||
| 92 | /** |
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| 93 | * Lexer constructor. |
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| 94 | * |
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| 95 | * @param TokenReaderInterface $reader |
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| 96 | */ |
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| 97 | public function __construct() |
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| 98 | { |
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| 99 | $startOfFileToken = new Token(TokenKindEnum::SOF); |
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| 100 | |||
| 101 | $this->lastToken = $startOfFileToken; |
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| 102 | $this->token = $startOfFileToken; |
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| 103 | $this->line = 1; |
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| 104 | $this->lineStart = 0; |
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| 105 | } |
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| 106 | |||
| 107 | /** |
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| 108 | * @inheritdoc |
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| 109 | * @throws SyntaxErrorException |
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| 110 | */ |
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| 111 | public function advance(): Token |
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| 112 | { |
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| 113 | $this->lastToken = $this->token; |
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| 114 | return $this->token = $this->lookahead(); |
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| 115 | } |
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| 116 | |||
| 117 | /** |
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| 118 | * @inheritdoc |
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| 119 | * @throws SyntaxErrorException |
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| 120 | */ |
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| 121 | public function lookahead(): Token |
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| 122 | { |
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| 123 | $token = $this->token; |
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| 124 | |||
| 125 | if (TokenKindEnum::EOF !== $token->getKind()) { |
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| 126 | do { |
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| 127 | $next = $this->readToken($token); |
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| 128 | $token->setNext($next); |
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| 129 | $token = $next; |
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| 130 | } while (TokenKindEnum::COMMENT === $token->getKind()); |
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| 131 | } |
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| 132 | |||
| 133 | return $token; |
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| 134 | } |
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| 135 | |||
| 136 | /** |
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| 137 | * @inheritdoc |
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| 138 | */ |
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| 139 | public function getOption(string $name, $default = null) |
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| 140 | { |
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| 141 | return $this->options[$name] ?? $default; |
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| 142 | } |
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| 143 | |||
| 144 | /** |
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| 145 | * @inheritdoc |
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| 146 | * @throws LanguageException |
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| 147 | */ |
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| 148 | public function getBody(): string |
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| 149 | { |
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| 150 | return $this->getSource()->getBody(); |
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| 151 | } |
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| 152 | |||
| 153 | /** |
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| 154 | * @inheritdoc |
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| 155 | */ |
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| 156 | public function getTokenKind(): string |
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| 157 | { |
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| 158 | return $this->token->getKind(); |
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| 159 | } |
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| 160 | |||
| 161 | /** |
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| 162 | * @inheritdoc |
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| 163 | */ |
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| 164 | public function getTokenValue(): ?string |
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| 165 | { |
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| 166 | return $this->token->getValue(); |
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| 167 | } |
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| 168 | |||
| 169 | /** |
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| 170 | * @inheritdoc |
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| 171 | */ |
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| 172 | public function getToken(): Token |
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| 173 | { |
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| 174 | return $this->token; |
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| 175 | } |
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| 176 | |||
| 177 | /** |
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| 178 | * @inheritdoc |
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| 179 | * @throws LanguageException |
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| 180 | */ |
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| 181 | public function getSource(): Source |
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| 182 | { |
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| 183 | if ($this->source instanceof Source) { |
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| 184 | return $this->source; |
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| 185 | } |
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| 186 | |||
| 187 | throw new LanguageException('No source has been set.'); |
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| 188 | } |
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| 189 | |||
| 190 | /** |
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| 191 | * @inheritdoc |
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| 192 | */ |
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| 193 | public function getLastToken(): Token |
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| 194 | { |
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| 195 | return $this->lastToken; |
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| 196 | } |
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| 197 | |||
| 198 | /** |
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| 199 | * @inheritdoc |
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| 200 | */ |
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| 201 | public function setSource(Source $source) |
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| 202 | { |
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| 203 | $this->body = $source->getBody(); |
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| 204 | $this->bodyLength = \strlen($this->body); |
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| 205 | $this->source = $source; |
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| 206 | return $this; |
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| 207 | } |
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| 208 | |||
| 209 | /** |
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| 210 | * @inheritdoc |
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| 211 | */ |
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| 212 | public function setOptions(array $options) |
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| 216 | } |
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| 217 | |||
| 218 | /** |
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| 219 | * @param Token $prev |
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| 220 | * @return Token |
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| 221 | * @throws SyntaxErrorException |
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| 222 | */ |
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| 223 | protected function readToken(Token $prev): Token |
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| 224 | { |
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| 225 | $this->pos = $prev->getEnd(); |
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| 226 | |||
| 227 | $this->skipWhitespace(); |
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| 228 | |||
| 229 | $line = $this->line; |
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| 230 | $col = 1 + $this->pos - $this->lineStart; |
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| 231 | |||
| 232 | if ($this->pos >= $this->bodyLength) { |
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| 233 | return $this->createEndOfFileToken($line, $col, $prev); |
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| 234 | } |
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| 235 | |||
| 236 | $code = charCodeAt($this->body, $this->pos); |
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|
Bug
introduced
by
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| 237 | |||
| 238 | // Punctuation: [!$&:=@|()\[\]{}]{1} |
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| 239 | if (33 === $code || 36 === $code || 38 === $code || 58 === $code || 61 === $code || 64 === $code || 124 === $code || |
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| 240 | 40 === $code || 41 === $code || 91 === $code || 93 === $code || 123 === $code || 125 === $code) { |
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| 241 | return $this->lexPunctuation($code, $line, $col, $prev); |
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| 242 | } |
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| 243 | |||
| 244 | // Comment: #[\u0009\u0020-\uFFFF]* |
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| 245 | if (35 === $code) { |
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| 246 | return $this->lexComment($line, $col, $prev); |
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| 247 | } |
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| 248 | |||
| 249 | // Int: -?(0|[1-9][0-9]*) |
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| 250 | // Float: -?(0|[1-9][0-9]*)(\.[0-9]+)?((E|e)(+|-)?[0-9]+)? |
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| 251 | if (45 === $code || isNumber($code)) { |
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| 252 | return $this->lexNumber($code, $line, $col, $prev); |
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| 253 | } |
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| 254 | |||
| 255 | // Name: [_A-Za-z][_0-9A-Za-z]* |
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| 256 | if (isAlphaNumeric($code)) { |
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| 257 | return $this->lexName($line, $col, $prev); |
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| 258 | } |
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| 259 | |||
| 260 | // Spread: ... |
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| 261 | if ($this->bodyLength >= 3 && isSpread($this->body, $code, $this->pos)) { |
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| 262 | return $this->lexSpread($line, $col, $prev); |
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| 263 | } |
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| 264 | |||
| 265 | // String: "([^"\\\u000A\u000D]|(\\(u[0-9a-fA-F]{4}|["\\/bfnrt])))*" |
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| 266 | if (isString($this->body, $code, $this->pos)) { |
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| 267 | return $this->lexString($line, $col, $prev); |
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| 268 | } |
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| 269 | |||
| 270 | // Block String: """("?"?(\\"""|\\(?!=""")|[^"\\]))*""" |
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| 271 | if ($this->bodyLength >= 3 && isTripleQuote($this->body, $code, $this->pos)) { |
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| 272 | return $this->lexBlockString($line, $col, $prev); |
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| 273 | } |
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| 274 | |||
| 275 | throw $this->createSyntaxErrorException(); |
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| 276 | } |
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| 277 | |||
| 278 | /** |
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| 279 | * Creates an End Of File (EOF) token. |
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| 280 | * |
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| 281 | * @param int $line |
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| 282 | * @param int $col |
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| 283 | * @param Token $prev |
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| 284 | * @return Token |
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| 285 | */ |
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| 286 | protected function createEndOfFileToken(int $line, int $col, Token $prev): Token |
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| 287 | { |
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| 288 | return new Token(TokenKindEnum::EOF, $this->bodyLength, $this->bodyLength, $line, $col, $prev); |
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| 289 | } |
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| 290 | |||
| 291 | /** |
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| 292 | * Reads a punctuation token from the source file. |
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| 293 | * |
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| 294 | * @param int $code |
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| 295 | * @param int $line |
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| 296 | * @param int $col |
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| 297 | * @param Token $prev |
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| 298 | * @return Token |
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| 299 | * @throws SyntaxErrorException |
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| 300 | */ |
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| 301 | protected function lexPunctuation(int $code, int $line, int $col, Token $prev): ?Token |
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| 302 | { |
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| 303 | if (!isset(self::$codeTokenKindMap[$code])) { |
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| 304 | throw $this->createSyntaxErrorException(); |
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| 305 | } |
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| 306 | |||
| 307 | return new Token(self::$codeTokenKindMap[$code], $this->pos, $this->pos + 1, $line, $col, $prev); |
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| 308 | } |
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| 309 | |||
| 310 | /** |
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| 311 | * Reads a name token from the source file. |
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| 312 | * |
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| 313 | * @param int $line |
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| 314 | * @param int $col |
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| 315 | * @param Token $prev |
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| 316 | * @return Token |
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| 317 | */ |
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| 318 | protected function lexName(int $line, int $col, Token $prev): Token |
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| 319 | { |
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| 320 | $start = $this->pos; |
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| 321 | $this->pos = $start + 1; |
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| 322 | |||
| 323 | while ($this->pos !== $this->bodyLength && |
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| 324 | ($code = charCodeAt($this->body, $this->pos)) !== null && |
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| 325 | isAlphaNumeric($code)) { |
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| 326 | ++$this->pos; |
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| 327 | } |
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| 328 | |||
| 329 | $value = sliceString($this->body, $start, $this->pos); |
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| 330 | |||
| 331 | return new Token(TokenKindEnum::NAME, $start, $this->pos, $line, $col, $prev, $value); |
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| 332 | } |
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| 333 | |||
| 334 | /** |
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| 335 | * Reads a number (int/float) token from the source file. |
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| 336 | * |
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| 337 | * @param int $code |
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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 | * @throws SyntaxErrorException |
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| 343 | */ |
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| 344 | protected function lexNumber(int $code, int $line, int $col, Token $prev): Token |
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| 399 | ); |
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| 400 | } |
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| 401 | |||
| 402 | /** |
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| 403 | * Reads digits from the source file. |
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| 404 | * |
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| 405 | * @param int $code |
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| 406 | * @throws SyntaxErrorException |
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| 407 | */ |
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| 408 | protected function skipDigits(int $code): void |
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| 409 | { |
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| 410 | if (isNumber($code)) { |
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| 411 | do { |
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| 412 | $code = charCodeAt($this->body, ++$this->pos); |
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| 413 | } while (isNumber($code)); |
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| 414 | |||
| 415 | return; |
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| 416 | } |
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| 417 | |||
| 418 | throw $this->createSyntaxErrorException( |
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| 419 | \sprintf('Invalid number, expected digit but got: %s.', printCharCode($code)) |
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| 420 | ); |
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| 421 | } |
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| 422 | |||
| 423 | /** |
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| 424 | * Reads a comment token from the source file. |
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| 425 | * |
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| 426 | * @param int $line |
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| 427 | * @param int $col |
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| 428 | * @param Token $prev |
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| 429 | * @return Token |
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| 430 | */ |
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| 431 | protected function lexComment(int $line, int $col, Token $prev): Token |
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| 432 | { |
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| 433 | $start = $this->pos; |
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| 434 | |||
| 435 | do { |
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| 436 | $code = charCodeAt($this->body, ++$this->pos); |
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| 437 | } while ($code !== null && ($code > 0x001f || 0x0009 === $code)); // SourceCharacter but not LineTerminator |
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| 438 | |||
| 439 | return new Token( |
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| 440 | TokenKindEnum::COMMENT, |
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| 441 | $start, |
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| 442 | $this->pos, |
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| 443 | $line, |
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| 444 | $col, |
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| 445 | $prev, |
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| 446 | sliceString($this->body, $start + 1, $this->pos) |
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| 447 | ); |
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| 448 | } |
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| 449 | |||
| 450 | /** |
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| 451 | * Reads a spread token from the source. |
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| 452 | * |
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| 453 | * @param int $line |
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| 454 | * @param int $col |
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| 455 | * @param Token $prev |
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| 456 | * @return Token |
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| 457 | */ |
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| 458 | protected function lexSpread(int $line, int $col, Token $prev): Token |
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| 459 | { |
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| 460 | return new Token(TokenKindEnum::SPREAD, $this->pos, $this->pos + 3, $line, $col, $prev); |
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| 461 | } |
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| 462 | |||
| 463 | /** |
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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 | * @throws SyntaxErrorException |
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| 469 | */ |
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| 470 | protected function lexString(int $line, int $col, Token $prev): Token |
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| 471 | { |
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| 472 | $start = $this->pos; |
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| 473 | $chunkStart = ++$this->pos; |
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| 474 | $value = ''; |
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| 475 | |||
| 476 | while ($this->pos < $this->bodyLength && |
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| 477 | ($code = charCodeAt($this->body, $this->pos)) !== null && !isLineTerminator($code)) { |
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| 478 | // Closing Quote (") |
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| 479 | if (34 === $code) { |
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| 480 | $value .= sliceString($this->body, $chunkStart, $this->pos); |
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| 481 | return new Token(TokenKindEnum::STRING, $start, $this->pos + 1, $line, $col, $prev, $value); |
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| 482 | } |
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| 483 | |||
| 484 | if (isSourceCharacter($code)) { |
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| 485 | throw $this->createSyntaxErrorException( |
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| 486 | \sprintf('Invalid character within String: %s.', printCharCode($code)) |
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| 487 | ); |
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| 488 | } |
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| 489 | |||
| 490 | ++$this->pos; |
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| 491 | |||
| 492 | if (92 === $code) { |
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| 493 | // \ |
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| 494 | $value .= sliceString($this->body, $chunkStart, $this->pos - 1); |
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| 495 | |||
| 496 | $code = charCodeAt($this->body, $this->pos); |
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| 497 | |||
| 498 | switch ($code) { |
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| 499 | case 34: // " |
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| 500 | $value .= '"'; |
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| 501 | break; |
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| 502 | case 47: // / |
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| 503 | $value .= '/'; |
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| 504 | break; |
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| 505 | case 92: // \ |
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| 506 | $value .= '\\'; |
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| 507 | break; |
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| 508 | case 98: // b |
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| 509 | $value .= '\b'; |
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| 510 | break; |
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| 511 | case 102: // f |
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| 512 | $value .= '\f'; |
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| 513 | break; |
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| 514 | case 110: // n |
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| 515 | $value .= '\n'; |
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| 516 | break; |
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| 517 | case 114: // r |
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| 518 | $value .= '\r'; |
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| 519 | break; |
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| 520 | case 116: // t |
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| 521 | $value .= '\t'; |
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| 522 | break; |
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| 523 | case 117: // u |
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| 524 | $unicodeString = sliceString($this->body, $this->pos + 1, $this->pos + 5); |
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| 525 | |||
| 526 | if (!\preg_match('/[0-9A-Fa-f]{4}/', $unicodeString)) { |
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| 527 | throw $this->createSyntaxErrorException( |
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| 528 | \sprintf('Invalid character escape sequence: \\u%s.', $unicodeString) |
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| 529 | ); |
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| 530 | } |
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| 531 | |||
| 532 | $value .= '\\u' . $unicodeString; |
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| 533 | $this->pos += 4; |
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| 534 | |||
| 535 | break; |
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| 536 | default: |
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| 537 | throw $this->createSyntaxErrorException( |
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| 538 | \sprintf('Invalid character escape sequence: \\%s.', \chr($code)) |
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| 539 | ); |
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| 540 | } |
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| 541 | |||
| 542 | ++$this->pos; |
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| 543 | |||
| 544 | $chunkStart = $this->pos; |
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| 545 | } |
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| 546 | } |
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| 547 | |||
| 548 | throw $this->createSyntaxErrorException('Unterminated string.'); |
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| 549 | } |
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| 550 | |||
| 551 | /** |
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| 552 | * @param int $line |
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| 553 | * @param int $col |
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| 554 | * @param Token $prev |
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| 555 | * @return Token |
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| 556 | * @throws SyntaxErrorException |
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| 557 | */ |
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| 558 | protected function lexBlockString(int $line, int $col, Token $prev): Token |
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| 596 | } |
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| 597 | |||
| 598 | /** |
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| 599 | * Skips all whitespace after current position. |
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| 600 | */ |
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| 601 | protected function skipWhitespace(): void |
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| 626 | } |
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| 627 | } |
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| 628 | } |
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| 629 | |||
| 630 | /** |
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| 631 | * Creates a `SyntaxErrorException` for the current position in the source. |
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| 632 | * |
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| 633 | * @param null|string $description |
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| 634 | * @return SyntaxErrorException |
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| 635 | */ |
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| 636 | protected function createSyntaxErrorException(?string $description = null): SyntaxErrorException |
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| 637 | { |
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| 638 | $code = charCodeAt($this->body, $this->pos); |
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| 639 | return new SyntaxErrorException( |
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| 640 | $this->source, |
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| 643 | ); |
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| 644 | } |
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| 645 | |||
| 646 | /** |
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| 647 | * Report a message that an unexpected character was encountered. |
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| 648 | * |
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| 649 | * @param int $code |
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| 650 | * @return string |
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| 651 | */ |
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| 652 | protected function unexpectedCharacterMessage(int $code): string |
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| 666 |
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