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<?php |
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declare(strict_types=1); |
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namespace Version\Constraint; |
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use Version\Exception\ExceptionInterface; |
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use Version\Exception\InvalidComparisonConstraintStringException; |
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use Version\Version; |
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/** |
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* @author Nikola Posa <[email protected]> |
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*/ |
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class ComparisonConstraintParser |
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{ |
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public const OPERATOR_OR = '||'; |
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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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* @var array |
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*/ |
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protected $constraintParts = []; |
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/** |
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* @param string $constraintString |
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* @return ComparisonConstraint|CompositeConstraint |
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*/ |
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public function parse(string $constraintString) |
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{ |
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$constraintString = trim($constraintString); |
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if ('' === $constraintString) { |
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1 |
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throw InvalidComparisonConstraintStringException::forEmptyString(); |
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} |
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$this->constraintString = $constraintString; |
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if (! $this->isMultiPartConstraint()) { |
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return $this->buildConstraint($this->constraintString); |
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} |
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$this->splitConstraintParts(); |
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return $this->buildCompositeConstraint(); |
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} |
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protected function isMultiPartConstraint() : bool |
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{ |
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return (false !== strpos($this->constraintString, ' ')); |
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} |
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3 |
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protected function splitConstraintParts() : void |
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{ |
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$constraintParts = explode(' ', $this->constraintString); |
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$this->constraintParts = array_map('trim', $constraintParts); |
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} |
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protected function buildConstraint(string $constraintPart) : ComparisonConstraint |
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{ |
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[$operator, $operandString] = array_values($this->parseConstraint($constraintPart)); |
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if (empty($operandString)) { |
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1 |
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$this->error(); |
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} |
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try { |
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return new ComparisonConstraint( |
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$operator ?: ComparisonConstraint::OPERATOR_EQ, |
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Version::fromString($operandString) |
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); |
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2 |
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} catch (ExceptionInterface $ex) { |
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2 |
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$this->error(); |
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} |
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} |
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protected function parseConstraint(string $constraintStringUnit) : array |
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{ |
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$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' => $operand, |
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]; |
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} |
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3 |
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protected function buildCompositeConstraint() : CompositeConstraint |
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{ |
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3 |
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$compositeAndConstraints = $compositeOrConstraints = []; |
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foreach ($this->constraintParts as $constraintPart) { |
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if (self::OPERATOR_OR === $constraintPart) { |
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$compositeOrConstraints[] = CompositeConstraint::and(...$compositeAndConstraints); |
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$compositeAndConstraints = []; //reset collected AND constraints |
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} else { |
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$compositeAndConstraints[] = $this->buildConstraint($constraintPart); |
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} |
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} |
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3 |
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if (!empty($compositeOrConstraints)) { |
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2 |
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if (empty($compositeAndConstraints)) { |
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//invalid OR constraint; no right side |
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1 |
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$this->error(); |
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} |
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115
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1 |
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$compositeOrConstraints[] = CompositeConstraint::and(...$compositeAndConstraints); |
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1 |
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return CompositeConstraint::or(...$compositeOrConstraints); |
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} |
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1 |
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return CompositeConstraint::and(...$compositeAndConstraints); |
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} |
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4 |
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protected function error() : void |
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{ |
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4 |
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throw InvalidComparisonConstraintStringException::forUnparsableString($this->constraintString); |
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} |
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127
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} |
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nikolaposa /
version
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This check marks access to variables or properties that have not been declared yet. While PHP has no explicit notion of declaring a variable, accessing it before a value is assigned to it is most likely a bug.