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<?php |
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declare(strict_types=1); |
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namespace Smoren\FormulaTools\Validators; |
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use InvalidArgumentException; |
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use Smoren\FormulaTools\Exceptions\BracketsException; |
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use Smoren\FormulaTools\Exceptions\InappropriateTokenException; |
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use Smoren\FormulaTools\Exceptions\InappropriateTokenPairException; |
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use Smoren\FormulaTools\Exceptions\InvalidTokenException; |
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use Smoren\FormulaTools\Exceptions\SyntaxException; |
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use Smoren\FormulaTools\Helpers\LoopHelper; |
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class LogicFormulaValidator |
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{ |
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/** |
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* @var array<string> |
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*/ |
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protected array $unaryOperators; |
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/** |
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* @var array<string> |
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*/ |
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protected array $binaryOperators; |
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/** |
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* @param array<string> $unaryOperators |
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* @param array<string> $binaryOperators |
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*/ |
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public function __construct(array $unaryOperators, array $binaryOperators) |
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{ |
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$this->unaryOperators = $unaryOperators; |
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$this->binaryOperators = $binaryOperators; |
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} |
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/** |
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* @param array<string> $tokens |
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* @return void |
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* |
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* @throws InvalidArgumentException |
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* @throws SyntaxException |
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*/ |
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210 |
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public function validate(array $tokens): void |
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{ |
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210 |
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if (!count($tokens)) { |
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2 |
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return; |
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} |
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$bracketsCount = 0; |
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foreach ($tokens as $token) { |
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if (!is_string($token)) { |
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throw new InvalidArgumentException("Token must be string"); |
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} |
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switch (true) { |
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case $this->isOpeningBracket($token): |
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$bracketsCount++; |
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break; |
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188 |
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case $this->isClosingBracket($token): |
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$bracketsCount--; |
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break; |
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case !$this->isValidToken($token): |
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throw new InvalidTokenException("Token is invalid", $token); |
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} |
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if ($bracketsCount < 0) { |
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throw new BracketsException("Brackets error", $token); |
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} |
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} |
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$lastToken = $tokens[count($tokens) - 1]; |
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if ($bracketsCount !== 0) { |
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throw new BracketsException( |
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"Brackets error", |
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$lastToken |
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); |
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} |
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if ($this->isOperator($lastToken)) { |
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throw new InappropriateTokenException( |
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"The last token '{$lastToken}' cannot be operator", |
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$lastToken |
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); |
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} |
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/** |
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* @var string $lhs |
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* @var string $rhs |
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*/ |
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foreach (LoopHelper::pairwise($tokens) as [$lhs, $rhs]) { |
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switch (true) { |
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case $this->isOperand($lhs) |
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&& ($this->isOperand($rhs) || $this->isOpeningBracket($rhs) || $this->isUnaryOperator($rhs)): |
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throw new InappropriateTokenPairException( |
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"Inappropriate token '{$rhs}' after operand '{$lhs}'", |
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$rhs, |
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$lhs |
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); |
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case $this->isOpeningBracket($lhs) |
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&& ($this->isClosingBracket($rhs) || $this->isBinaryOperator($rhs)): |
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throw new InappropriateTokenPairException( |
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"Inappropriate token '{$rhs}' after opening bracket", |
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$rhs, |
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$lhs |
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); |
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case $this->isClosingBracket($lhs) |
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&& ($this->isOpeningBracket($rhs) || $this->isOperand($rhs) || $this->isUnaryOperator($rhs)): |
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throw new InappropriateTokenPairException( |
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"Inappropriate token '{$rhs}' after closing bracket", |
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$rhs, |
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$lhs |
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); |
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case $this->isOperator($lhs) |
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&& ($this->isBinaryOperator($rhs) || $this->isClosingBracket($rhs)): |
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throw new InappropriateTokenPairException( |
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"Inappropriate token '{$rhs}' after operator '{$lhs}'", |
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$rhs, |
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$lhs |
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); |
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} |
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} |
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} |
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protected function isBracket(string $token): bool |
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{ |
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return $this->isOpeningBracket($token) || $this->isClosingBracket($token); |
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} |
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protected function isOpeningBracket(string $token): bool |
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{ |
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return $token === '('; |
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} |
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protected function isClosingBracket(string $token): bool |
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{ |
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return $token === ')'; |
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} |
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protected function isOperator(string $token): bool |
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{ |
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return $this->isUnaryOperator($token) || $this->isBinaryOperator($token); |
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} |
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protected function isUnaryOperator(string $token): bool |
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{ |
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return in_array($token, $this->unaryOperators); |
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} |
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protected function isBinaryOperator(string $token): bool |
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{ |
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return in_array($token, $this->binaryOperators); |
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} |
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protected function isOperand(string $token): bool |
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{ |
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return !$this->isBracket($token) && !$this->isOperator($token); |
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} |
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private function isValidToken(string $token): bool |
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{ |
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return $this->isBracket($token) || !preg_match('/[\(\)]/', $token); |
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} |
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} |
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Smoren /
formula-tools-php
