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<?php |
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/** |
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* This file is part of NACL. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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* |
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* @copyright 2019 Nuglif (2018) Inc. |
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* @license http://www.opensource.org/licenses/mit-license.html MIT License |
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* @author Pierrick Charron <[email protected]> |
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* @author Charle Demers <[email protected]> |
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*/ |
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declare(strict_types=1); |
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namespace Nuglif\Nacl; |
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abstract class AbstractLexer |
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{ |
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const STATE_INITIAL = 0; |
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const EOF = '<<EOF>>'; |
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private $regexes = []; |
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private $tokenMaps = []; |
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private $state = self::STATE_INITIAL; |
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private $stack = []; |
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protected $line; |
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protected $content; |
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protected $count; |
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protected $filename; |
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abstract protected function getRules(); |
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public function __construct() |
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{ |
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foreach ($this->getRules() as $state => $patterns) { |
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$eofCallback = false; |
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if (isset($patterns[self::EOF])) { |
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$eofCallback = $patterns[self::EOF]; |
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unset($patterns[self::EOF]); |
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} |
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$this->regexes[$state] = $this->computeRegex(array_keys($patterns)); |
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$this->tokenMaps[$state] = array_values($patterns); |
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$this->tokenMaps[$state][-1] = $eofCallback; |
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} |
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} |
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public function yylex() |
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{ |
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do { |
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if (isset($this->content[$this->count])) { |
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if (!preg_match($this->regexes[$this->state], $this->content, $matches, 0, $this->count)) { |
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$this->error(sprintf('Unexpected character "%s"', $this->content[$this->count])); |
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} |
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for ($i = 1; '' === $matches[$i]; ++$i) { |
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} |
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$this->count += strlen($matches[0]); |
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$this->line += substr_count($matches[0], "\n"); |
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} else { |
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$i = 0; |
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$matches = [ '' ]; |
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} |
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if ($this->tokenMaps[$this->state][$i - 1]) { |
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$callback = $this->tokenMaps[$this->state][$i - 1]; |
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if ($token = $callback($matches[$i])) { |
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return new Token($token, $matches[$i]); |
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} |
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} |
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} while ($i); |
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} |
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protected function error($errorMessage) |
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{ |
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throw new LexingException($errorMessage, $this->filename, $this->line); |
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} |
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protected function begin($state) |
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{ |
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$this->state = $state; |
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} |
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private function computeRegex($patterns) |
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{ |
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return '#\G(' . implode(')|\G(', $patterns) . ')#A'; |
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} |
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public function push($content, $filename = null) |
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{ |
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if (null !== $this->content) { |
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$this->stack[] = [ |
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$this->line, |
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$this->content, |
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$this->count, |
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$this->filename, |
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]; |
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} |
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$this->line = 1; |
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$this->content = $content; |
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$this->count = 0; |
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$this->filename = $filename; |
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} |
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public function pop() |
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{ |
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if (empty($this->stack)) { |
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return false; |
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} |
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[ |
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$this->line, |
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$this->content, |
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$this->count, |
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$this->filename |
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] = array_pop($this->stack); |
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return true; |
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} |
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public function getLine() |
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{ |
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return $this->line; |
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} |
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public function getFilename() |
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{ |
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return $this->filename; |
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} |
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} |
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Nuglif /
nacl
