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<?php declare(strict_types=1); |
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/** |
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* portable-game-notation (https://github.com/chesszebra/portable-game-notation) |
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* |
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* @link https://github.com/chesszebra/portable-game-notation for the canonical source repository |
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* @copyright Copyright (c) 2017 Chess Zebra (https://chesszebra.com) |
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* @license https://github.com/chesszebra/portable-game-notation/blob/master/LICENSE.md MIT |
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*/ |
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namespace ChessZebra\PortableGameNotation\Lexer; |
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use ChessZebra\PortableGameNotation\Token\Comment; |
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use ChessZebra\PortableGameNotation\Token\EndResult; |
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use ChessZebra\PortableGameNotation\Token\MoveNumber; |
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use ChessZebra\PortableGameNotation\Token\TokenInterface; |
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use ChessZebra\PortableGameNotation\Token\NullMove; |
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use ChessZebra\PortableGameNotation\Token\NumericAnnotationGlyph; |
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use ChessZebra\PortableGameNotation\Token\RecursiveAnnotationVariation; |
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use ChessZebra\PortableGameNotation\Token\StandardAlgebraicNotation; |
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use ChessZebra\PortableGameNotation\Token\TagPair; |
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use ChessZebra\PortableGameNotation\Lexer\Exception\InvalidTokenException; |
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use ChessZebra\StandardAlgebraicNotation\Notation; |
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abstract class AbstractLexer implements LexerInterface |
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{ |
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/** |
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* @var string |
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*/ |
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protected $buffer; |
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/** |
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* Initializes a new instance of this class. |
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*/ |
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public function __construct() |
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{ |
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$this->buffer = ''; |
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} |
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/** |
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* Gets the next token from the lexer. |
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* |
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* @return TokenInterface|null |
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* @throws InvalidTokenException |
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*/ |
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public function getNextToken(): ?TokenInterface |
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{ |
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if (!$this->buffer) { |
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return null; |
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} |
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// Match a tag pair: |
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if (preg_match('/^\s*\[(.+?)(\s+"(.+?)")?\]/s', $this->buffer, $matches) !== 0) { |
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$this->buffer = substr($this->buffer, strlen($matches[0])); |
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return new TagPair($matches[1], $matches[3]); |
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} |
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// Match a null move |
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if (preg_match('/^\s*--\s*/', $this->buffer, $matches)) { |
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$this->buffer = substr($this->buffer, strlen($matches[0])); |
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return new NullMove(); |
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} |
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// Match a null move |
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if (preg_match('/^\s*Z0\s*/', $this->buffer, $matches)) { |
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$this->buffer = substr($this->buffer, strlen($matches[0])); |
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return new NullMove(); |
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} |
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// Match an end result: |
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if (preg_match('/^\s*(\*|1-0|0-1|1\/2-1\/2)\s*/', $this->buffer, $matches)) { |
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$this->buffer = substr($this->buffer, strlen($matches[0])); |
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return new EndResult($matches[1]); |
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} |
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// Match a move number: |
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if (preg_match('/^\s*([0-9]+)\.+\s*/', $this->buffer, $matches)) { |
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$this->buffer = substr($this->buffer, strlen($matches[0])); |
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return new MoveNumber((int)$matches[1]); |
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} |
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// Match a SAN (castling): |
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if (preg_match('/^\s*(O-O(?:-O)?[\+\-\!\#\=\?]*)\s*/s', $this->buffer, $matches)) { |
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$this->buffer = substr($this->buffer, strlen($matches[0])); |
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return new StandardAlgebraicNotation(new Notation($matches[1])); |
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} |
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// Match a SAN (castling): |
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if (preg_match('/^\s*(0-0(?:-0)?[\+\-\!\#\=\?]*)\s*/s', $this->buffer, $matches)) { |
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$this->buffer = substr($this->buffer, strlen($matches[0])); |
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return new StandardAlgebraicNotation(new Notation($matches[1])); |
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} |
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// Match a SAN: |
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if (preg_match('/^\s*([a-zA-Z][a-zA-Z0-9\+\-\!\#\=\?]+)\s*/s', $this->buffer, $matches)) { |
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$this->buffer = substr($this->buffer, strlen($matches[0])); |
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return new StandardAlgebraicNotation(new Notation($matches[1])); |
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} |
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// Match a comment: |
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if (preg_match('/^\s*\{(.*?)\}\s*/s', $this->buffer, $matches)) { |
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$this->buffer = substr($this->buffer, strlen($matches[0])); |
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return new Comment($matches[1]); |
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} |
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// Match a Recursive Annotation Variation: |
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if (preg_match('/^\s*[\(|\)]/s', $this->buffer, $matches)) { |
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$this->buffer = substr($this->buffer, strlen($matches[0])); |
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return new RecursiveAnnotationVariation(trim($matches[0]) === '('); |
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} |
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// Match a Numeric Annotation Glyph |
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if (preg_match('/^\s*\$([0-9]+)\s*/', $this->buffer, $matches)) { |
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$this->buffer = substr($this->buffer, strlen($matches[0])); |
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return new NumericAnnotationGlyph((int)trim($matches[1])); |
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} |
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throw InvalidTokenException::createForBuffer($this->buffer); |
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} |
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/** |
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* Peeks in the stream what the next token will be. |
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* |
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* @return TokenInterface|null |
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* @throws InvalidTokenException |
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*/ |
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public function peekNextToken(): ?TokenInterface |
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{ |
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$buffer = $this->buffer; |
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$token = $this->getNextToken(); |
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$this->buffer = $buffer; |
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return $token; |
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} |
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} |
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chesszebra /
portable-game-notation
