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<?php |
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/** |
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* This file is part of the Version package. |
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* |
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* Copyright (c) Nikola Posa <[email protected]> |
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* |
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* For full copyright and license information, please refer to the LICENSE file, |
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* located at the package root folder. |
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*/ |
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namespace Version\Constraint\Parser; |
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use Version\Constraint\ConstraintInterface; |
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use Version\Constraint\Constraint; |
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use Version\Version; |
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use Version\Exception\InvalidConstraintStringException; |
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use Version\Exception\Exception; |
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/** |
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* @author Nikola Posa <[email protected]> |
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*/ |
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abstract class AbstractParser implements ParserInterface |
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{ |
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/** |
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* @var string |
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*/ |
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protected $constraintString; |
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/** |
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* {@inheritdoc} |
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*/ |
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public function parse($constraintString) |
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{ |
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if (!is_string($constraintString)) { |
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throw InvalidConstraintStringException::forInvalidType($constraintString); |
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} |
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$constraintString = trim($constraintString); |
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if ($constraintString == '') { |
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throw InvalidConstraintStringException::forEmptyCostraintString(); |
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} |
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$this->constraintString = $constraintString; |
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return $this->doParse(); |
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} |
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/** |
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* @return ConstraintInterface |
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*/ |
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abstract protected function doParse(); |
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protected function error() |
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{ |
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throw InvalidConstraintStringException::forConstraintString($this->constraintString); |
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} |
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/** |
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* @param string $constraintStringUnit |
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* @return Constraint |
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*/ |
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protected function buildConstraintFromStringUnit($constraintStringUnit) |
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{ |
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list($operator, $operandString) = array_values( |
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$this->parseConstraintStringUnit($constraintStringUnit) |
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); |
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if (empty($operandString)) { |
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$this->error(); |
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} |
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try { |
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return Constraint::fromProperties( |
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$operator ?: Constraint::OPERATOR_EQ, |
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Version::fromString($operandString) |
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); |
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} catch (Exception $ex) { |
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$this->error(); |
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} |
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} |
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/** |
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* @param string $constraintStringUnit |
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* @return array |
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*/ |
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protected function parseConstraintStringUnit($constraintStringUnit) |
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{ |
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$i = 0; |
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while (isset($constraintStringUnit[$i]) && !ctype_digit($constraintStringUnit[$i])) { |
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$i++; |
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} |
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$operator = substr($constraintStringUnit, 0, $i); |
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$operand = substr($constraintStringUnit, $i); |
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return [ |
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'operator' => $operator, |
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'operand' => $operand, |
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]; |
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} |
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} |
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nikolaposa /
version
