digiaonline /
graphql-php
| Total Complexity | 112 |
| Total Lines | 708 |
| 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 | protected const ENCODING = 'UTF-8'; |
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| 10 | |||
| 11 | /** |
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| 12 | * A map between punctuation character code and the corresponding token kind. |
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| 13 | * |
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| 14 | * @var array |
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| 15 | */ |
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| 16 | protected static $codeTokenKindMap = [ |
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| 17 | 33 => TokenKindEnum::BANG, |
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| 18 | 36 => TokenKindEnum::DOLLAR, |
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| 19 | 38 => TokenKindEnum::AMP, |
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| 20 | 40 => TokenKindEnum::PAREN_L, |
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| 21 | 41 => TokenKindEnum::PAREN_R, |
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| 22 | 58 => TokenKindEnum::COLON, |
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| 23 | 61 => TokenKindEnum::EQUALS, |
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| 24 | 64 => TokenKindEnum::AT, |
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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 | 124 => TokenKindEnum::PIPE, |
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| 29 | 125 => TokenKindEnum::BRACE_R, |
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| 30 | ]; |
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| 31 | |||
| 32 | /** |
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| 33 | * The source file for this lexer. |
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| 34 | * |
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| 35 | * @var Source |
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| 36 | */ |
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| 37 | protected $source; |
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| 38 | |||
| 39 | /** |
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| 40 | * The contents of the source file. |
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| 41 | * |
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| 42 | * @var string |
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| 43 | */ |
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| 44 | protected $body; |
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| 45 | |||
| 46 | /** |
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| 47 | * The total number of characters in the source file. |
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| 48 | * |
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| 49 | * @var int |
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| 50 | */ |
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| 51 | protected $bodyLength; |
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| 52 | |||
| 53 | /** |
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| 54 | * The options for this lexer. |
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| 55 | * |
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| 56 | * @var array |
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| 57 | */ |
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| 58 | protected $options = []; |
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| 59 | |||
| 60 | /** |
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| 61 | * The previously focused non-ignored token. |
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| 62 | * |
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| 63 | * @var Token |
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| 64 | */ |
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| 65 | protected $lastToken; |
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| 66 | |||
| 67 | /** |
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| 68 | * The currently focused non-ignored token. |
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| 69 | * |
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| 70 | * @var Token |
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| 71 | */ |
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| 72 | protected $token; |
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| 73 | |||
| 74 | /** |
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| 75 | * The current position. |
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| 76 | * |
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| 77 | * @var int |
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| 78 | */ |
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| 79 | protected $pos; |
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| 80 | |||
| 81 | /** |
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| 82 | * The (1-indexed) line containing the current token. |
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| 83 | * |
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| 84 | * @var int |
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| 85 | */ |
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| 86 | protected $line; |
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| 87 | |||
| 88 | /** |
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| 89 | * The character offset at which the current line begins. |
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| 90 | * |
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| 91 | * @var int |
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| 92 | */ |
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| 93 | protected $lineStart; |
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| 94 | |||
| 95 | /** |
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| 96 | * @var array |
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| 97 | */ |
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| 98 | protected static $charCodeCache = []; |
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| 99 | |||
| 100 | /** |
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| 101 | * Lexer constructor. |
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| 102 | * @param Source|null $source |
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| 103 | * @param array $options |
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| 104 | */ |
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| 105 | public function __construct(Source $source, array $options) |
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| 106 | { |
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| 107 | $startOfFileToken = $this->createStartOfFileToken(); |
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| 108 | |||
| 109 | $this->lastToken = $startOfFileToken; |
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| 110 | $this->token = $startOfFileToken; |
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| 111 | $this->line = 1; |
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| 112 | $this->lineStart = 0; |
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| 113 | $this->body = $source->getBody(); |
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| 114 | $this->bodyLength = \strlen($this->body); |
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| 115 | $this->source = $source; |
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| 116 | $this->options = $options; |
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| 117 | } |
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| 118 | |||
| 119 | /** |
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| 120 | * @inheritdoc |
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| 121 | * @throws SyntaxErrorException |
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| 122 | */ |
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| 123 | public function advance(): Token |
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| 124 | { |
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| 125 | $this->lastToken = $this->token; |
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| 126 | return $this->token = $this->lookahead(); |
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| 127 | } |
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| 128 | |||
| 129 | /** |
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| 130 | * @inheritdoc |
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| 131 | * @throws SyntaxErrorException |
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| 132 | */ |
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| 133 | public function lookahead(): Token |
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| 134 | { |
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| 135 | $token = $this->token; |
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| 136 | |||
| 137 | if (TokenKindEnum::EOF !== $token->getKind()) { |
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| 138 | do { |
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| 139 | $next = $this->readToken($token); |
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| 140 | $token->setNext($next); |
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| 141 | $token = $next; |
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| 142 | } while (TokenKindEnum::COMMENT === $token->getKind()); |
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| 143 | } |
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| 144 | |||
| 145 | return $token; |
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| 146 | } |
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| 147 | |||
| 148 | /** |
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| 149 | * @inheritdoc |
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| 150 | */ |
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| 151 | public function getOption(string $name, $default = null) |
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| 152 | { |
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| 153 | return $this->options[$name] ?? $default; |
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| 154 | } |
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| 155 | |||
| 156 | /** |
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| 157 | * @inheritdoc |
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| 158 | */ |
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| 159 | public function getTokenKind(): string |
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| 160 | { |
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| 161 | return $this->token->getKind(); |
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| 162 | } |
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| 163 | |||
| 164 | /** |
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| 165 | * @inheritdoc |
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| 166 | */ |
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| 167 | public function getTokenValue(): ?string |
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| 168 | { |
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| 169 | return $this->token->getValue(); |
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| 170 | } |
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| 171 | |||
| 172 | /** |
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| 173 | * @inheritdoc |
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| 174 | */ |
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| 175 | public function getToken(): Token |
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| 176 | { |
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| 177 | return $this->token; |
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| 178 | } |
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| 179 | |||
| 180 | /** |
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| 181 | * @inheritdoc |
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| 182 | */ |
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| 183 | public function getSource(): Source |
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| 184 | { |
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| 185 | return $this->source; |
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| 186 | } |
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| 187 | |||
| 188 | /** |
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| 189 | * @inheritdoc |
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| 190 | */ |
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| 191 | public function getLastToken(): Token |
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| 192 | { |
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| 193 | return $this->lastToken; |
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| 194 | } |
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| 195 | |||
| 196 | /** |
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| 197 | * @inheritdoc |
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| 198 | */ |
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| 199 | public function createSyntaxErrorException(?string $description = null): SyntaxErrorException |
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| 200 | { |
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| 201 | return new SyntaxErrorException( |
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| 202 | $this->source, |
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| 203 | $this->pos, |
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| 204 | $description ?? $this->unexpectedCharacterMessage($this->readCharCode($this->pos)) |
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| 205 | ); |
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| 206 | } |
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| 207 | |||
| 208 | /** |
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| 209 | * Reads the token after the given token. |
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| 210 | * |
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| 211 | * @param Token $prev |
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| 212 | * @return Token |
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| 213 | * @throws SyntaxErrorException |
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| 214 | */ |
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| 215 | protected function readToken(Token $prev): Token |
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| 216 | { |
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| 217 | $this->pos = $prev->getEnd(); |
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| 218 | |||
| 219 | $this->skipWhitespace(); |
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| 220 | |||
| 221 | $line = $this->line; |
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| 222 | $col = (1 + $this->pos) - $this->lineStart; |
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| 223 | |||
| 224 | if ($this->pos >= $this->bodyLength) { |
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| 225 | return $this->createEndOfFileToken($line, $col, $prev); |
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| 226 | } |
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| 227 | |||
| 228 | $code = $this->readCharCode($this->pos); |
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| 229 | |||
| 230 | // Punctuation: [!$&:=@|()\[\]{}]{1} |
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| 231 | if (33 === $code || 36 === $code || 38 === $code || 58 === $code || 61 === $code || 64 === $code || 124 === $code || |
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| 232 | 40 === $code || 41 === $code || 91 === $code || 93 === $code || 123 === $code || 125 === $code) { |
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| 233 | return $this->lexPunctuation($code, $line, $col, $prev); |
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| 234 | } |
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| 235 | |||
| 236 | // Comment: #[\u0009\u0020-\uFFFF]* |
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| 237 | if (35 === $code) { |
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| 238 | return $this->lexComment($line, $col, $prev); |
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| 239 | } |
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| 240 | |||
| 241 | // Int: -?(0|[1-9][0-9]*) |
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| 242 | // Float: -?(0|[1-9][0-9]*)(\.[0-9]+)?((E|e)(+|-)?[0-9]+)? |
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| 243 | if (45 === $code || isNumber($code)) { |
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| 244 | return $this->lexNumber($code, $line, $col, $prev); |
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| 245 | } |
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| 246 | |||
| 247 | // Name: [_A-Za-z][_0-9A-Za-z]* |
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| 248 | if (isAlphaNumeric($code)) { |
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| 249 | return $this->lexName($line, $col, $prev); |
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| 250 | } |
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| 251 | |||
| 252 | // Spread: ... |
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| 253 | if ($this->bodyLength >= 3 && $this->isSpread($code)) { |
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| 254 | return $this->lexSpread($line, $col, $prev); |
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| 255 | } |
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| 256 | |||
| 257 | // String: "([^"\\\u000A\u000D]|(\\(u[0-9a-fA-F]{4}|["\\/bfnrt])))*" |
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| 258 | if ($this->isString($code)) { |
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| 259 | return $this->lexString($line, $col, $prev); |
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| 260 | } |
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| 261 | |||
| 262 | // Block String: """("?"?(\\"""|\\(?!=""")|[^"\\]))*""" |
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| 263 | if ($this->bodyLength >= 3 && $this->isTripleQuote($code)) { |
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| 264 | return $this->lexBlockString($line, $col, $prev); |
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| 265 | } |
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| 266 | |||
| 267 | throw $this->createSyntaxErrorException(); |
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| 268 | } |
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| 269 | |||
| 270 | /** |
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| 271 | * @return Token |
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| 272 | */ |
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| 273 | protected function createStartOfFileToken(): Token |
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| 274 | { |
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| 275 | return new Token(TokenKindEnum::SOF); |
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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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| 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 = $this->pos; |
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| 321 | |||
| 322 | ++$this->pos; |
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| 323 | |||
| 324 | while ($this->pos !== $this->bodyLength && |
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| 325 | ($code = $this->readCharCode($this->pos)) !== null && |
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| 326 | isAlphaNumeric($code)) { |
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| 327 | ++$this->pos; |
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| 328 | } |
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| 329 | |||
| 330 | $value = sliceString($this->body, $start, $this->pos); |
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| 331 | |||
| 332 | return new Token(TokenKindEnum::NAME, $start, $this->pos, $line, $col, $prev, $value); |
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| 333 | } |
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| 334 | |||
| 335 | /** |
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| 336 | * Reads a number (int or float) token from the source file. |
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| 337 | * |
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| 338 | * @param int $code |
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| 339 | * @param int $line |
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| 340 | * @param int $col |
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| 341 | * @param Token $prev |
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| 342 | * @return Token |
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| 343 | * @throws SyntaxErrorException |
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| 344 | */ |
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| 345 | protected function lexNumber(int $code, int $line, int $col, Token $prev): Token |
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| 400 | ); |
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| 401 | } |
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| 402 | |||
| 403 | /** |
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| 404 | * Skips digits at the current position. |
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| 405 | * |
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| 406 | * @param int $code |
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| 407 | * @throws SyntaxErrorException |
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| 408 | */ |
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| 409 | protected function skipDigits(int $code): void |
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| 410 | { |
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| 411 | if (isNumber($code)) { |
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| 412 | do { |
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| 413 | $code = $this->readCharCode(++$this->pos); |
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| 414 | } while (isNumber($code)); |
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| 415 | |||
| 416 | return; |
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| 417 | } |
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| 418 | |||
| 419 | throw $this->createSyntaxErrorException( |
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| 420 | \sprintf('Invalid number, expected digit but got: %s.', printCharCode($code)) |
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| 421 | ); |
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| 422 | } |
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| 423 | |||
| 424 | /** |
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| 425 | * Reads a comment token from the source file. |
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| 426 | * |
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| 427 | * @param int $line |
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| 428 | * @param int $col |
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| 429 | * @param Token $prev |
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| 430 | * @return Token |
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| 431 | */ |
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| 432 | protected function lexComment(int $line, int $col, Token $prev): Token |
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| 433 | { |
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| 434 | $start = $this->pos; |
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| 435 | |||
| 436 | do { |
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| 437 | $code = $this->readCharCode(++$this->pos); |
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| 438 | } while ($code !== null && ($code > 0x001f || 0x0009 === $code)); // SourceCharacter but not LineTerminator |
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| 439 | |||
| 440 | return new Token( |
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| 441 | TokenKindEnum::COMMENT, |
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| 442 | $start, |
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| 443 | $this->pos, |
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| 444 | $line, |
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| 445 | $col, |
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| 446 | $prev, |
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| 447 | sliceString($this->body, $start + 1, $this->pos) |
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| 448 | ); |
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| 449 | } |
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| 450 | |||
| 451 | /** |
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| 452 | * Reads a spread token from the source. |
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| 453 | * |
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| 454 | * @param int $line |
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| 455 | * @param int $col |
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| 456 | * @param Token $prev |
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| 457 | * @return Token |
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| 458 | */ |
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| 459 | protected function lexSpread(int $line, int $col, Token $prev): Token |
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| 460 | { |
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| 461 | return new Token(TokenKindEnum::SPREAD, $this->pos, $this->pos + 3, $line, $col, $prev); |
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| 462 | } |
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| 463 | |||
| 464 | /** |
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| 465 | * Reads a string token from the source. |
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| 466 | * |
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| 467 | * @param int $line |
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| 468 | * @param int $col |
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| 469 | * @param Token $prev |
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| 470 | * @return Token |
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| 471 | * @throws SyntaxErrorException |
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| 472 | */ |
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| 473 | protected function lexString(int $line, int $col, Token $prev): Token |
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| 474 | { |
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| 475 | $start = $this->pos; |
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| 476 | $chunkStart = ++$this->pos; // skip the quote |
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| 477 | $value = ''; |
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| 478 | |||
| 479 | while ($this->pos < $this->bodyLength && |
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| 480 | ($code = $this->readCharCode($this->pos)) !== null && !isLineTerminator($code)) { |
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| 481 | // Closing Quote (") |
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| 482 | if (34 === $code) { |
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| 483 | $value .= sliceString($this->body, $chunkStart, $this->pos); |
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| 484 | return new Token(TokenKindEnum::STRING, $start, $this->pos + 1, $line, $col, $prev, $value); |
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| 485 | } |
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| 486 | |||
| 487 | if (isSourceCharacter($code)) { |
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| 488 | throw $this->createSyntaxErrorException( |
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| 489 | \sprintf('Invalid character within String: %s.', printCharCode($code)) |
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| 490 | ); |
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| 491 | } |
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| 492 | |||
| 493 | ++$this->pos; |
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| 494 | |||
| 495 | if (92 === $code) { |
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| 496 | // \ |
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| 497 | $value .= sliceString($this->body, $chunkStart, $this->pos - 1); |
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| 498 | |||
| 499 | $code = $this->readCharCode($this->pos); |
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| 500 | |||
| 501 | switch ($code) { |
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| 502 | case 34: // " |
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| 503 | $value .= '"'; |
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| 504 | break; |
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| 505 | case 47: // / |
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| 506 | $value .= '/'; |
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| 507 | break; |
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| 508 | case 92: // \ |
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| 509 | $value .= '\\'; |
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| 510 | break; |
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| 511 | case 98: // b |
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| 512 | $value .= '\b'; |
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| 513 | break; |
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| 514 | case 102: // f |
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| 515 | $value .= '\f'; |
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| 516 | break; |
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| 517 | case 110: // n |
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| 518 | $value .= '\n'; |
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| 519 | break; |
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| 520 | case 114: // r |
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| 521 | $value .= '\r'; |
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| 522 | break; |
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| 523 | case 116: // t |
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| 524 | $value .= '\t'; |
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| 525 | break; |
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| 526 | case 117: // u |
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| 527 | $unicodeString = sliceString($this->body, $this->pos + 1, $this->pos + 5); |
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| 528 | |||
| 529 | if (!\preg_match('/[0-9A-Fa-f]{4}/', $unicodeString)) { |
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| 530 | throw $this->createSyntaxErrorException( |
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| 531 | \sprintf('Invalid character escape sequence: \\u%s.', $unicodeString) |
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| 532 | ); |
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| 533 | } |
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| 534 | |||
| 535 | $value .= '\\u' . $unicodeString; |
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| 536 | $this->pos += 4; |
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| 537 | |||
| 538 | break; |
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| 539 | default: |
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| 540 | throw $this->createSyntaxErrorException( |
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| 541 | \sprintf('Invalid character escape sequence: \\%s.', \chr($code)) |
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| 542 | ); |
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| 543 | } |
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| 544 | |||
| 545 | ++$this->pos; |
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| 546 | |||
| 547 | $chunkStart = $this->pos; |
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| 548 | } |
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| 549 | } |
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| 550 | |||
| 551 | throw $this->createSyntaxErrorException('Unterminated string.'); |
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| 552 | } |
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| 553 | |||
| 554 | /** |
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| 555 | * Reads a block string token from the source file. |
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| 556 | * |
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| 557 | * @param int $line |
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| 558 | * @param int $col |
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| 559 | * @param Token $prev |
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| 560 | * @return Token |
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| 561 | * @throws SyntaxErrorException |
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| 562 | */ |
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| 563 | protected function lexBlockString(int $line, int $col, Token $prev): Token |
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| 601 | } |
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| 602 | |||
| 603 | /** |
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| 604 | * Skips whitespace at the current position. |
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| 605 | */ |
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| 606 | protected function skipWhitespace(): void |
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| 607 | { |
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| 608 | while ($this->pos < $this->bodyLength) { |
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| 609 | $code = $this->readCharCode($this->pos); |
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| 610 | |||
| 611 | if (9 === $code || 32 === $code || 44 === $code || 0xfeff === $code) { |
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| 612 | // tab | space | comma | BOM |
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| 613 | ++$this->pos; |
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| 614 | } elseif (10 === $code) { |
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| 615 | // new line (\n) |
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| 616 | ++$this->pos; |
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| 617 | ++$this->line; |
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| 618 | $this->lineStart = $this->pos; |
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| 619 | } elseif (13 === $code) { |
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| 620 | // carriage return (\r) |
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| 621 | if (10 === $this->readCharCode($this->pos + 1)) { |
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| 622 | // carriage return and new line (\r\n) |
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| 623 | $this->pos += 2; |
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| 624 | } else { |
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| 625 | ++$this->pos; |
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| 626 | } |
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| 627 | ++$this->line; |
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| 628 | $this->lineStart = $this->pos; |
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| 629 | } else { |
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| 630 | break; |
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| 631 | } |
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| 632 | } |
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| 633 | } |
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| 634 | |||
| 635 | /** |
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| 636 | * @param int $pos |
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| 637 | * @return int |
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| 638 | */ |
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| 639 | protected function readCharCode(int $pos): int |
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| 652 | } |
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| 653 | |||
| 654 | /** |
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| 655 | * Report a message that an unexpected character was encountered. |
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| 656 | * |
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| 657 | * @param int $code |
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| 658 | * @return string |
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| 659 | */ |
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| 660 | protected function unexpectedCharacterMessage(int $code): string |
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| 661 | { |
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| 662 | if (isSourceCharacter($code) && !isLineTerminator($code)) { |
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| 663 | return \sprintf('Cannot contain the invalid character %s.', printCharCode($code)); |
||
| 664 | } |
||
| 665 | |||
| 666 | if ($code === 39) { |
||
| 667 | // ' |
||
| 668 | return 'Unexpected single quote character (\'), did you mean to use a double quote (")?'; |
||
| 669 | } |
||
| 670 | |||
| 671 | return \sprintf('Cannot parse the unexpected character %s.', printCharCode($code)); |
||
| 672 | } |
||
| 673 | |||
| 674 | /** |
||
| 675 | * @param int $code |
||
| 676 | * @return bool |
||
| 677 | */ |
||
| 678 | protected function isSpread(int $code): bool |
||
| 679 | { |
||
| 680 | return 46 === $code && |
||
| 681 | $this->readCharCode($this->pos + 1) === 46 && |
||
| 682 | $this->readCharCode($this->pos + 2) === 46; // ... |
||
| 683 | } |
||
| 684 | |||
| 685 | /** |
||
| 686 | * @param int $code |
||
| 687 | * @return bool |
||
| 688 | */ |
||
| 689 | protected function isString(int $code): bool |
||
| 690 | { |
||
| 691 | return 34 === $code && $this->readCharCode($this->pos + 1) !== 34; |
||
| 692 | } |
||
| 693 | |||
| 694 | /** |
||
| 695 | * @param int $code |
||
| 696 | * @return bool |
||
| 697 | */ |
||
| 698 | protected function isTripleQuote(int $code): bool |
||
| 699 | { |
||
| 700 | return 34 === $code && |
||
| 701 | 34 === $this->readCharCode($this->pos + 1) && |
||
| 702 | 34 === $this->readCharCode($this->pos + 2); // """ |
||
| 703 | } |
||
| 704 | |||
| 705 | /** |
||
| 706 | * @param int $code |
||
| 707 | * @return bool |
||
| 708 | */ |
||
| 709 | protected function isEscapedTripleQuote(int $code): bool |
||
| 715 | } |
||
| 716 | } |
||
| 717 |
