digiaonline /
graphql-php
| Total Complexity | 111 |
| Total Lines | 704 |
| 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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| 7 | class Lexer implements LexerInterface |
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| 8 | { |
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| 9 | /** |
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| 10 | * A map between punctuation character code and the corresponding token kind. |
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| 11 | * |
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| 12 | * @var array |
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| 13 | */ |
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| 14 | protected static $codeTokenKindMap = [ |
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| 15 | 33 => TokenKindEnum::BANG, |
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| 16 | 36 => TokenKindEnum::DOLLAR, |
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| 17 | 38 => TokenKindEnum::AMP, |
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| 18 | 40 => TokenKindEnum::PAREN_L, |
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| 19 | 41 => TokenKindEnum::PAREN_R, |
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| 20 | 58 => TokenKindEnum::COLON, |
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| 21 | 61 => TokenKindEnum::EQUALS, |
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| 22 | 64 => TokenKindEnum::AT, |
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| 23 | 91 => TokenKindEnum::BRACKET_L, |
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| 24 | 93 => TokenKindEnum::BRACKET_R, |
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| 25 | 123 => TokenKindEnum::BRACE_L, |
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| 26 | 124 => TokenKindEnum::PIPE, |
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| 27 | 125 => TokenKindEnum::BRACE_R, |
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| 28 | ]; |
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| 29 | |||
| 30 | /** |
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| 31 | * The source file for this lexer. |
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| 32 | * |
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| 33 | * @var Source |
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| 34 | */ |
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| 35 | protected $source; |
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| 36 | |||
| 37 | /** |
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| 38 | * The contents of the source file. |
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| 39 | * |
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| 40 | * @var string |
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| 41 | */ |
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| 42 | protected $body; |
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| 43 | |||
| 44 | /** |
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| 45 | * The total number of characters in the source file. |
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| 46 | * |
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| 47 | * @var int |
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| 48 | */ |
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| 49 | protected $bodyLength; |
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| 50 | |||
| 51 | /** |
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| 52 | * The options for this lexer. |
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| 53 | * |
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| 54 | * @var array |
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| 55 | */ |
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| 56 | protected $options = []; |
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| 57 | |||
| 58 | /** |
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| 59 | * The previously focused non-ignored token. |
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| 60 | * |
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| 61 | * @var Token |
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| 62 | */ |
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| 63 | protected $lastToken; |
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| 64 | |||
| 65 | /** |
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| 66 | * The currently focused non-ignored token. |
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| 67 | * |
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| 68 | * @var Token |
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| 69 | */ |
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| 70 | protected $token; |
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| 71 | |||
| 72 | /** |
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| 73 | * The current position. |
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| 74 | * |
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| 75 | * @var int |
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| 76 | */ |
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| 77 | protected $pos; |
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| 78 | |||
| 79 | /** |
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| 80 | * The (1-indexed) line containing the current token. |
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| 81 | * |
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| 82 | * @var int |
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| 83 | */ |
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| 84 | protected $line; |
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| 85 | |||
| 86 | /** |
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| 87 | * The character offset at which the current line begins. |
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| 88 | * |
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| 89 | * @var int |
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| 90 | */ |
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| 91 | protected $lineStart; |
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| 92 | |||
| 93 | /** |
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| 94 | * @var array |
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| 95 | */ |
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| 96 | protected static $charCodeCache = []; |
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| 97 | |||
| 98 | /** |
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| 99 | * Lexer constructor. |
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| 100 | * @param Source|null $source |
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| 101 | * @param array $options |
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| 102 | */ |
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| 103 | public function __construct(Source $source, array $options) |
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| 104 | { |
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| 105 | $startOfFileToken = $this->createStartOfFileToken(); |
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| 106 | |||
| 107 | $this->lastToken = $startOfFileToken; |
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| 108 | $this->token = $startOfFileToken; |
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| 109 | $this->line = 1; |
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| 110 | $this->lineStart = 0; |
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| 111 | $this->body = $source->getBody(); |
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| 112 | $this->bodyLength = \strlen($this->body); |
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| 113 | $this->source = $source; |
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| 114 | $this->options = $options; |
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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 advance(): Token |
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| 122 | { |
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| 123 | $this->lastToken = $this->token; |
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| 124 | return $this->token = $this->lookahead(); |
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| 125 | } |
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| 126 | |||
| 127 | /** |
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| 128 | * @inheritdoc |
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| 129 | * @throws SyntaxErrorException |
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| 130 | */ |
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| 131 | public function lookahead(): Token |
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| 132 | { |
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| 133 | $token = $this->token; |
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| 134 | |||
| 135 | if (TokenKindEnum::EOF !== $token->getKind()) { |
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| 136 | do { |
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| 137 | $next = $this->readToken($token); |
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| 138 | $token->setNext($next); |
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| 139 | $token = $next; |
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| 140 | } while (TokenKindEnum::COMMENT === $token->getKind()); |
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| 141 | } |
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| 142 | |||
| 143 | return $token; |
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| 144 | } |
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| 145 | |||
| 146 | /** |
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| 147 | * @inheritdoc |
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| 148 | */ |
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| 149 | public function getOption(string $name, $default = null) |
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| 150 | { |
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| 151 | return $this->options[$name] ?? $default; |
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| 152 | } |
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| 153 | |||
| 154 | /** |
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| 155 | * @inheritdoc |
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| 156 | */ |
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| 157 | public function getTokenKind(): string |
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| 158 | { |
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| 159 | return $this->token->getKind(); |
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| 160 | } |
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| 161 | |||
| 162 | /** |
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| 163 | * @inheritdoc |
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| 164 | */ |
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| 165 | public function getTokenValue(): ?string |
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| 166 | { |
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| 167 | return $this->token->getValue(); |
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| 168 | } |
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| 169 | |||
| 170 | /** |
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| 171 | * @inheritdoc |
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| 172 | */ |
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| 173 | public function getToken(): Token |
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| 174 | { |
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| 175 | return $this->token; |
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| 176 | } |
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| 177 | |||
| 178 | /** |
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| 179 | * @inheritdoc |
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| 180 | */ |
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| 181 | public function getSource(): Source |
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| 182 | { |
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| 183 | return $this->source; |
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| 184 | } |
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| 185 | |||
| 186 | /** |
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| 187 | * @inheritdoc |
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| 188 | */ |
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| 189 | public function getLastToken(): Token |
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| 190 | { |
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| 191 | return $this->lastToken; |
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| 192 | } |
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| 193 | |||
| 194 | /** |
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| 195 | * Reads the token after the given token. |
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| 196 | * |
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| 197 | * @param Token $prev |
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| 198 | * @return Token |
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| 199 | * @throws SyntaxErrorException |
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| 200 | */ |
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| 201 | protected function readToken(Token $prev): Token |
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| 202 | { |
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| 203 | $this->pos = $prev->getEnd(); |
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| 204 | |||
| 205 | $this->skipWhitespace(); |
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| 206 | |||
| 207 | $line = $this->line; |
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| 208 | $col = (1 + $this->pos) - $this->lineStart; |
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| 209 | |||
| 210 | if ($this->pos >= $this->bodyLength) { |
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| 211 | return $this->createEndOfFileToken($line, $col, $prev); |
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| 212 | } |
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| 213 | |||
| 214 | $code = $this->readCharCode($this->pos); |
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| 215 | |||
| 216 | // Punctuation: [!$&:=@|()\[\]{}]{1} |
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| 217 | if (33 === $code || 36 === $code || 38 === $code || 58 === $code || 61 === $code || 64 === $code || 124 === $code || |
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| 218 | 40 === $code || 41 === $code || 91 === $code || 93 === $code || 123 === $code || 125 === $code) { |
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| 219 | return $this->lexPunctuation($code, $line, $col, $prev); |
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| 220 | } |
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| 221 | |||
| 222 | // Comment: #[\u0009\u0020-\uFFFF]* |
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| 223 | if (35 === $code) { |
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| 224 | return $this->lexComment($line, $col, $prev); |
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| 225 | } |
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| 226 | |||
| 227 | // Int: -?(0|[1-9][0-9]*) |
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| 228 | // Float: -?(0|[1-9][0-9]*)(\.[0-9]+)?((E|e)(+|-)?[0-9]+)? |
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| 229 | if (45 === $code || isNumber($code)) { |
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| 230 | return $this->lexNumber($code, $line, $col, $prev); |
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| 231 | } |
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| 232 | |||
| 233 | // Name: [_A-Za-z][_0-9A-Za-z]* |
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| 234 | if (isAlphaNumeric($code)) { |
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| 235 | return $this->lexName($line, $col, $prev); |
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| 236 | } |
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| 237 | |||
| 238 | // Spread: ... |
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| 239 | if ($this->bodyLength >= 3 && $this->isSpread($code)) { |
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| 240 | return $this->lexSpread($line, $col, $prev); |
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| 241 | } |
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| 242 | |||
| 243 | // String: "([^"\\\u000A\u000D]|(\\(u[0-9a-fA-F]{4}|["\\/bfnrt])))*" |
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| 244 | if ($this->isString($code)) { |
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| 245 | return $this->lexString($line, $col, $prev); |
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| 246 | } |
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| 247 | |||
| 248 | // Block String: """("?"?(\\"""|\\(?!=""")|[^"\\]))*""" |
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| 249 | if ($this->bodyLength >= 3 && $this->isTripleQuote($code)) { |
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| 250 | return $this->lexBlockString($line, $col, $prev); |
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| 251 | } |
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| 252 | |||
| 253 | throw $this->createSyntaxErrorException(); |
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| 254 | } |
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| 255 | |||
| 256 | /** |
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| 257 | * @return Token |
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| 258 | */ |
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| 259 | protected function createStartOfFileToken(): Token |
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| 262 | } |
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| 263 | |||
| 264 | /** |
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| 265 | * Creates an End Of File (EOF) token. |
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| 266 | * |
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| 267 | * @param int $line |
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| 268 | * @param int $col |
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| 269 | * @param Token $prev |
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| 270 | * @return Token |
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| 271 | */ |
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| 272 | protected function createEndOfFileToken(int $line, int $col, Token $prev): Token |
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| 273 | { |
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| 274 | return new Token(TokenKindEnum::EOF, $this->bodyLength, $this->bodyLength, $line, $col, $prev); |
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| 275 | } |
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| 276 | |||
| 277 | /** |
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| 278 | * Reads a punctuation token from the source file. |
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| 279 | * |
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| 280 | * @param int $code |
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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 | * @throws SyntaxErrorException |
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| 286 | */ |
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| 287 | protected function lexPunctuation(int $code, int $line, int $col, Token $prev): ?Token |
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| 288 | { |
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| 289 | if (!isset(self::$codeTokenKindMap[$code])) { |
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| 290 | throw $this->createSyntaxErrorException(); |
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| 291 | } |
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| 292 | |||
| 293 | return new Token(self::$codeTokenKindMap[$code], $this->pos, $this->pos + 1, $line, $col, $prev); |
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| 294 | } |
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| 295 | |||
| 296 | /** |
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| 297 | * Reads a name token from the source file. |
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| 298 | * |
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| 299 | * @param int $line |
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| 300 | * @param int $col |
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| 301 | * @param Token $prev |
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| 302 | * @return Token |
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| 303 | */ |
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| 304 | protected function lexName(int $line, int $col, Token $prev): Token |
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| 305 | { |
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| 306 | $start = $this->pos; |
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| 307 | |||
| 308 | ++$this->pos; |
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| 309 | |||
| 310 | while ($this->pos !== $this->bodyLength && |
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| 311 | ($code = $this->readCharCode($this->pos)) !== null && |
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| 312 | isAlphaNumeric($code)) { |
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| 313 | ++$this->pos; |
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| 314 | } |
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| 315 | |||
| 316 | $value = sliceString($this->body, $start, $this->pos); |
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| 317 | |||
| 318 | return new Token(TokenKindEnum::NAME, $start, $this->pos, $line, $col, $prev, $value); |
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| 319 | } |
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| 320 | |||
| 321 | /** |
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| 322 | * Reads a number (int or float) token from the source file. |
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| 323 | * |
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| 324 | * @param int $code |
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| 325 | * @param int $line |
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| 326 | * @param int $col |
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| 327 | * @param Token $prev |
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| 328 | * @return Token |
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| 329 | * @throws SyntaxErrorException |
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| 330 | */ |
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| 331 | protected function lexNumber(int $code, int $line, int $col, Token $prev): Token |
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| 385 | ); |
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| 386 | } |
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| 387 | |||
| 388 | /** |
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| 389 | * Skips digits at the current position. |
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| 390 | * |
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| 391 | * @param int $code |
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| 392 | * @throws SyntaxErrorException |
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| 393 | */ |
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| 394 | protected function skipDigits(int $code): void |
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| 395 | { |
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| 396 | if (isNumber($code)) { |
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| 397 | do { |
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| 398 | $code = $this->readCharCode(++$this->pos); |
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| 399 | } while (isNumber($code)); |
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| 400 | |||
| 401 | return; |
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| 402 | } |
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| 403 | |||
| 404 | throw $this->createSyntaxErrorException( |
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| 405 | \sprintf('Invalid number, expected digit but got: %s.', printCharCode($code)) |
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| 406 | ); |
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| 407 | } |
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| 408 | |||
| 409 | /** |
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| 410 | * Reads a comment token from the source file. |
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| 411 | * |
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| 412 | * @param int $line |
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| 413 | * @param int $col |
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| 414 | * @param Token $prev |
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| 415 | * @return Token |
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| 416 | */ |
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| 417 | protected function lexComment(int $line, int $col, Token $prev): Token |
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| 418 | { |
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| 419 | $start = $this->pos; |
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| 420 | |||
| 421 | do { |
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| 422 | $code = $this->readCharCode(++$this->pos); |
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| 423 | } while ($code !== null && ($code > 0x001f || 0x0009 === $code)); // SourceCharacter but not LineTerminator |
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| 424 | |||
| 425 | return new Token( |
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| 426 | TokenKindEnum::COMMENT, |
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| 427 | $start, |
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| 428 | $this->pos, |
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| 429 | $line, |
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| 430 | $col, |
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| 431 | $prev, |
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| 432 | sliceString($this->body, $start + 1, $this->pos) |
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| 433 | ); |
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| 434 | } |
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| 435 | |||
| 436 | /** |
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| 437 | * Reads a spread token from the source. |
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| 438 | * |
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| 439 | * @param int $line |
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| 440 | * @param int $col |
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| 441 | * @param Token $prev |
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| 442 | * @return Token |
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| 443 | */ |
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| 444 | protected function lexSpread(int $line, int $col, Token $prev): Token |
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| 445 | { |
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| 446 | return new Token(TokenKindEnum::SPREAD, $this->pos, $this->pos + 3, $line, $col, $prev); |
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| 447 | } |
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| 448 | |||
| 449 | /** |
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| 450 | * Reads a string token from the source. |
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| 451 | * |
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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 | * @throws SyntaxErrorException |
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| 457 | */ |
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| 458 | protected function lexString(int $line, int $col, Token $prev): Token |
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| 459 | { |
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| 460 | $start = $this->pos; |
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| 461 | $chunkStart = ++$this->pos; // skip the quote |
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| 462 | $value = ''; |
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| 463 | |||
| 464 | while ($this->pos < $this->bodyLength && |
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| 465 | ($code = $this->readCharCode($this->pos)) !== null && !isLineTerminator($code)) { |
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| 466 | // Closing Quote (") |
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| 467 | if (34 === $code) { |
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| 468 | $value .= sliceString($this->body, $chunkStart, $this->pos); |
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| 469 | return new Token(TokenKindEnum::STRING, $start, $this->pos + 1, $line, $col, $prev, $value); |
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| 470 | } |
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| 471 | |||
| 472 | if (isSourceCharacter($code)) { |
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| 473 | throw $this->createSyntaxErrorException( |
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| 474 | \sprintf('Invalid character within String: %s.', printCharCode($code)) |
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| 475 | ); |
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| 476 | } |
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| 477 | |||
| 478 | ++$this->pos; |
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| 479 | |||
| 480 | if (92 === $code) { |
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| 481 | // \ |
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| 482 | $value .= sliceString($this->body, $chunkStart, $this->pos - 1); |
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| 483 | |||
| 484 | $code = $this->readCharCode($this->pos); |
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| 485 | |||
| 486 | switch ($code) { |
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| 487 | case 34: // " |
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| 488 | $value .= '"'; |
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| 489 | break; |
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| 490 | case 47: // / |
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| 491 | $value .= '/'; |
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| 492 | break; |
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| 493 | case 92: // \ |
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| 494 | $value .= '\\'; |
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| 495 | break; |
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| 496 | case 98: // b |
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| 497 | $value .= '\b'; |
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| 498 | break; |
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| 499 | case 102: // f |
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| 500 | $value .= '\f'; |
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| 501 | break; |
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| 502 | case 110: // n |
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| 503 | $value .= '\n'; |
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| 504 | break; |
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| 505 | case 114: // r |
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| 506 | $value .= '\r'; |
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| 507 | break; |
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| 508 | case 116: // t |
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| 509 | $value .= '\t'; |
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| 510 | break; |
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| 511 | case 117: // u |
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| 512 | $unicodeString = sliceString($this->body, $this->pos + 1, $this->pos + 5); |
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| 513 | |||
| 514 | if (!\preg_match('/[0-9A-Fa-f]{4}/', $unicodeString)) { |
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| 515 | throw $this->createSyntaxErrorException( |
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| 516 | \sprintf('Invalid character escape sequence: \\u%s.', $unicodeString) |
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| 517 | ); |
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| 518 | } |
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| 519 | |||
| 520 | $value .= '\\u' . $unicodeString; |
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| 521 | $this->pos += 4; |
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| 522 | |||
| 523 | break; |
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| 524 | default: |
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| 525 | throw $this->createSyntaxErrorException( |
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| 526 | \sprintf('Invalid character escape sequence: \\%s.', \chr($code)) |
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| 527 | ); |
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| 528 | } |
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| 529 | |||
| 530 | ++$this->pos; |
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| 531 | |||
| 532 | $chunkStart = $this->pos; |
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| 533 | } |
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| 534 | } |
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| 535 | |||
| 536 | throw $this->createSyntaxErrorException('Unterminated string.'); |
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| 537 | } |
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| 538 | |||
| 539 | /** |
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| 540 | * Reads a block string token from the source file. |
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| 541 | * |
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| 542 | * @param int $line |
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| 543 | * @param int $col |
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| 544 | * @param Token $prev |
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| 545 | * @return Token |
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| 546 | * @throws SyntaxErrorException |
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| 547 | */ |
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| 548 | protected function lexBlockString(int $line, int $col, Token $prev): Token |
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| 586 | } |
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| 587 | |||
| 588 | /** |
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| 589 | * Skips whitespace at the current position. |
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| 590 | */ |
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| 591 | protected function skipWhitespace(): void |
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| 592 | { |
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| 593 | while ($this->pos < $this->bodyLength) { |
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| 594 | $code = $this->readCharCode($this->pos); |
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| 595 | |||
| 596 | if (9 === $code || 32 === $code || 44 === $code || 0xfeff === $code) { |
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| 597 | // tab | space | comma | BOM |
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| 598 | ++$this->pos; |
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| 599 | } elseif (10 === $code) { |
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| 600 | // new line (\n) |
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| 601 | ++$this->pos; |
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| 602 | ++$this->line; |
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| 603 | $this->lineStart = $this->pos; |
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| 604 | } elseif (13 === $code) { |
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| 605 | // carriage return (\r) |
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| 606 | if (10 === $this->readCharCode($this->pos + 1)) { |
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| 607 | // carriage return and new line (\r\n) |
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| 608 | $this->pos += 2; |
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| 609 | } else { |
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| 610 | ++$this->pos; |
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| 611 | } |
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| 612 | ++$this->line; |
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| 613 | $this->lineStart = $this->pos; |
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| 614 | } else { |
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| 615 | break; |
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| 616 | } |
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| 617 | } |
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| 618 | } |
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| 619 | |||
| 620 | /** |
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| 621 | * @param int $pos |
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| 622 | * @return int |
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| 623 | */ |
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| 624 | protected function readCharCode(int $pos): int |
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| 633 | } |
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| 634 | |||
| 635 | /** |
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| 636 | * Creates a `SyntaxErrorException` for the current position in the source. |
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| 637 | * |
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| 638 | * @param null|string $description |
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| 639 | * @return SyntaxErrorException |
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| 640 | */ |
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| 641 | protected function createSyntaxErrorException(?string $description = null): SyntaxErrorException |
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| 642 | { |
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| 643 | return new SyntaxErrorException( |
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| 644 | $this->source, |
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| 645 | $this->pos, |
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| 646 | $description ?? $this->unexpectedCharacterMessage($this->readCharCode($this->pos)) |
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| 647 | ); |
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| 648 | } |
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| 649 | |||
| 650 | /** |
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| 651 | * Report a message that an unexpected character was encountered. |
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| 652 | * |
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| 653 | * @param int $code |
||
| 654 | * @return string |
||
| 655 | */ |
||
| 656 | protected function unexpectedCharacterMessage(int $code): string |
||
| 657 | { |
||
| 658 | if (isSourceCharacter($code) && !isLineTerminator($code)) { |
||
| 659 | return \sprintf('Cannot contain the invalid character %s.', printCharCode($code)); |
||
| 660 | } |
||
| 661 | |||
| 662 | if ($code === 39) { |
||
| 663 | // ' |
||
| 664 | return 'Unexpected single quote character (\'), did you mean to use a double quote (")?'; |
||
| 665 | } |
||
| 666 | |||
| 667 | return \sprintf('Cannot parse the unexpected character %s.', printCharCode($code)); |
||
| 668 | } |
||
| 669 | |||
| 670 | /** |
||
| 671 | * @param int $code |
||
| 672 | * @return bool |
||
| 673 | */ |
||
| 674 | protected function isSpread(int $code): bool |
||
| 675 | { |
||
| 676 | return 46 === $code && |
||
| 677 | $this->readCharCode($this->pos + 1) === 46 && |
||
| 678 | $this->readCharCode($this->pos + 2) === 46; // ... |
||
| 679 | } |
||
| 680 | |||
| 681 | /** |
||
| 682 | * @param int $code |
||
| 683 | * @return bool |
||
| 684 | */ |
||
| 685 | protected function isString(int $code): bool |
||
| 686 | { |
||
| 687 | return 34 === $code && $this->readCharCode($this->pos + 1) !== 34; |
||
| 688 | } |
||
| 689 | |||
| 690 | /** |
||
| 691 | * @param int $code |
||
| 692 | * @return bool |
||
| 693 | */ |
||
| 694 | protected function isTripleQuote(int $code): bool |
||
| 695 | { |
||
| 696 | return 34 === $code && |
||
| 697 | 34 === $this->readCharCode($this->pos + 1) && |
||
| 698 | 34 === $this->readCharCode($this->pos + 2); // """ |
||
| 699 | } |
||
| 700 | |||
| 701 | /** |
||
| 702 | * @param int $code |
||
| 703 | * @return bool |
||
| 704 | */ |
||
| 705 | protected function isEscapedTripleQuote(int $code): bool |
||
| 711 | } |
||
| 712 | } |
||
| 713 |
This check compares calls to functions or methods with their respective definitions. If the call has less arguments than are defined, it raises an issue.
If a function is defined several times with a different number of parameters, the check may pick up the wrong definition and report false positives. One codebase where this has been known to happen is Wordpress. Please note the @ignore annotation hint above.