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<?php declare(strict_types=1); namespace Doctrine\Common\Lexer; use ReflectionClass; use UnitEnum; use function implode; use function preg_split; use function sprintf; use function substr; use const PREG_SPLIT_DELIM_CAPTURE; use const PREG_SPLIT_NO_EMPTY; use const PREG_SPLIT_OFFSET_CAPTURE; /** * Base class for writing simple lexers, i.e. for creating small DSLs. * * @template T of UnitEnum\|string\|int * @template V of string\|int / abstract class AbstractLexer { /* * Lexer original input string. / private string $input; /* * Array of scanned tokens. * * @var list<Token<T, V>> / private array $tokens = []; /* * Current lexer position in input string. / private int $position = 0; /* * Current peek of current lexer position. / private int $peek = 0; /* * The next token in the input. * * @var Token<T, V>\|null / public Token\|null $lookahead; /* * The last matched/seen token. * * @var Token<T, V>\|null / public Token\|null $token; /* * Composed regex for input parsing. * * @var non-empty-string\|null / private string\|null $regex = null; /* * Sets the input data to be tokenized. * * The Lexer is immediately reset and the new input tokenized. * Any unprocessed tokens from any previous input are lost. * * @param string $input The input to be tokenized. * * @return void / public function setInput(string $input) { $this->input = $input; $this->tokens = []; $this->reset(); $this->scan($input); } /* * Resets the lexer. * * @return void / public function reset() { $this->lookahead = null; $this->token = null; $this->peek = 0; $this->position = 0; } /* * Resets the peek pointer to 0. * * @return void / public function resetPeek() { $this->peek = 0; } /* * Resets the lexer position on the input to the given position. * * @param int $position Position to place the lexical scanner. * * @return void / public function resetPosition(int $position = 0) { $this->position = $position; } /* * Retrieve the original lexer's input until a given position. * * @return string / public function getInputUntilPosition(int $position) { return substr($this->input, 0, $position); } /* * Checks whether a given token matches the current lookahead. * * @param T $type * * @return bool * * @psalm-assert-if-true !=null $this->lookahead / public function isNextToken(int\|string\|UnitEnum $type) { return $this->lookahead !== null && $this->lookahead->isA($type); } /* * Checks whether any of the given tokens matches the current lookahead. * * @param list<T> $types * * @return bool * * @psalm-assert-if-true !=null $this->lookahead / public function isNextTokenAny(array $types) { return $this->lookahead !== null && $this->lookahead->isA(...$types); } /* * Moves to the next token in the input string. * * @return bool * * @psalm-assert-if-true !null $this->lookahead / public function moveNext() { $this->peek = 0; $this->token = $this->lookahead; $this->lookahead = isset($this->tokens[$this->position]) ? $this->tokens[$this->position++] : null; return $this->lookahead !== null; } /* * Tells the lexer to skip input tokens until it sees a token with the given value. * * @param T $type The token type to skip until. * * @return void / public function skipUntil(int\|string\|UnitEnum $type) { while ($this->lookahead !== null && ! $this->lookahead->isA($type)) { $this->moveNext(); } } /* * Checks if given value is identical to the given token. * * @return bool / public function isA(string $value, int\|string\|UnitEnum $token) { return $this->getType($value) === $token; } /* * Moves the lookahead token forward. * * @return Token<T, V>\|null The next token or NULL if there are no more tokens ahead. / public function peek() { if (isset($this->tokens[$this->position + $this->peek])) { return $this->tokens[$this->position + $this->peek++]; } return null; } /* * Peeks at the next token, returns it and immediately resets the peek. * * @return Token<T, V>\|null The next token or NULL if there are no more tokens ahead. / public function glimpse() { $peek = $this->peek(); $this->peek = 0; return $peek; } /* * Scans the input string for tokens. * * @param string $input A query string. * * @return void / protected function scan(string $input) { if (! isset($this->regex)) { $this->regex = sprintf( '/(%s)\|%s/%s', implode(')\|(', $this->getCatchablePatterns()), implode('\|', $this->getNonCatchablePatterns()), $this->getModifiers(), ); } $flags = PREG_SPLIT_NO_EMPTY \| PREG_SPLIT_DELIM_CAPTURE \| PREG_SPLIT_OFFSET_CAPTURE; $matches = preg_split($this->regex, $input, -1, $flags); if ($matches === false) { // Work around https://bugs.php.net/78122 $matches = [[$input, 0]]; } foreach ($matches as $match) { // Must remain before 'value' assignment since it can change content $firstMatch = $match[0]; $type = $this->getType($firstMatch); $this->tokens[] = new Token( $firstMatch, $type, $match[1], ); } } /* * Gets the literal for a given token. * * @param T $token * * @return int\|string / public function getLiteral(int\|string\|UnitEnum $token) { if ($token instanceof UnitEnum) { return $token::class . '::' . $token->name; } $className = static::class; $reflClass = new ReflectionClass($className); $constants = $reflClass->getConstants(); foreach ($constants as $name => $value) { if ($value === $token) { return $className . '::' . $name; } } return $token; } /* * Regex modifiers * * @return string / protected function getModifiers() { return 'iu'; } /* * Lexical catchable patterns. * * @return string[] / abstract protected function getCatchablePatterns(); /* * Lexical non-catchable patterns. * * @return string[] / abstract protected function getNonCatchablePatterns(); /* * Retrieve token type. Also processes the token value if necessary. * * @return T\|null * * @param-out V $value */ abstract protected function getType(string &$value); }

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