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<?php |
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namespace Popy\Calendar\Parser\DateLexer; |
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use BadMethodCallException; |
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use Popy\Calendar\Parser\DateLexerResult; |
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use Popy\Calendar\Parser\PregDateLexerInterface; |
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/** |
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* Collection/Chain implementation of Preg lexer. It differs from a standard |
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* collection on few points : |
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* - accept only PregDateLexerInterface lexers |
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* - will not call tokenizeDate on lexers |
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* - will integrate sub lexers' patterns into it's own, in order to perform |
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* a single preg_match |
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* At the end, this collection will perform 3x faster than the standard |
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* Collection implementation with the same internal lexers. |
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*/ |
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class PregCollection extends AbstractPreg |
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{ |
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/** |
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* Currently built expression. |
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* |
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* @var string |
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*/ |
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protected $regexp = ''; |
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/** |
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* Registered lexers. |
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* |
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* @var array<PregDateLexerInterface> |
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*/ |
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protected $lexers = []; |
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/** |
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* Built expressions. |
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* |
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* @var array<string> |
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*/ |
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protected $expressions = []; |
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/** |
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* Final compiled regular expression. |
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* |
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* @var string|null |
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*/ |
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protected $compiled; |
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/** |
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* Registers a pattern in the collection. |
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* |
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* @param PregDateLexerInterface $lexer |
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*/ |
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public function register(PregDateLexerInterface $lexer) |
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{ |
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$this->regexp .= $lexer->getExpression(); |
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$this->lexers[] = $lexer; |
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} |
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/** |
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* Closes/finishes the current expression, by adding it to the list of |
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* finished expressions and resetting it in case another expression has to |
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* be built. |
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*/ |
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public function close() |
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{ |
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if ($this->regexp) { |
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$this->expressions[] = $this->regexp; |
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$this->regexp = ''; |
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} |
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} |
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/** |
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* Compile internal expression into the final one. |
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*/ |
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public function compile() |
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{ |
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if ($this->compiled !== null) { |
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return; |
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} |
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$this->compiled = $this->compileExpressions(); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function getExpression() |
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{ |
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$this->compile(); |
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return $this->compiled; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function hydrateResult(DateLexerResult $result, $match, $offset = 1) |
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{ |
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foreach ($this->lexers as $lexer) { |
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// No more matches : useless to continue |
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if (!isset($match[$offset])) { |
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return $offset; |
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} |
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$offset = $lexer->hydrateResult($result, $match, $offset); |
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} |
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return $offset; |
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} |
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/** |
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* Compile expression list. |
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* |
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* @return string |
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*/ |
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protected function compileExpressions() |
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{ |
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if (count($this->expressions) === 0) { |
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throw new BadMethodCallException('Can\'t compile an empty expression'); |
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} |
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if (count($this->expressions) === 1) { |
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return reset($this->expressions); |
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} |
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$parts = []; |
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foreach ($this->expressions as $expr) { |
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$expr = '(?:' . $expr . ')'; |
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$parts[] = $expr; |
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} |
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return '(?:' . implode('|', $parts) . ')'; |
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} |
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} |
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popy-dev /
popy-calendar
