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<?php |
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/** |
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* ExpressionParser.php |
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* |
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* @date 28.03.2015 1:03:37 |
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* @copyright Sklyarov Alexey <[email protected]> |
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*/ |
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namespace Sufir\Calc; |
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use InvalidArgumentException; |
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use Sufir\Calc\Token; |
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use Sufir\Calc\Token\TokenFactory; |
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/** |
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* ExpressionParser |
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* |
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* Description of ExpressionParser |
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* |
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* @todo Multibyte encoding support. |
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* @author Sklyarov Alexey <[email protected]> |
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* @package Sufir\Calc |
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*/ |
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class Lexer |
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{ |
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/** |
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* Разбивает переданную строку на токены |
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* |
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* @param string $expr |
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* @return Token[] |
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*/ |
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public function parse($expr) |
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{ |
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if (!is_string($expr) || strlen($expr) < 1) { |
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throw new InvalidArgumentException('Wrong expression'); |
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} |
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$stack = array(); |
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$tokenFactory = new TokenFactory(); |
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$lastToken = ''; |
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$lastTokenType = null; |
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for ($i = 0; $i < mb_strlen($expr); $i++) { |
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$char = $expr[$i]; |
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// Скобки |
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if ($char === '(' || $char === ')') { |
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if ($lastTokenType) { |
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$stack[] = $tokenFactory->create($lastTokenType, $lastToken); |
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} |
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$lastTokenType = Token::TYPE_BRACKET; |
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$lastToken = $char; |
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// Разделители параметров функции |
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} elseif ($char === ',') { |
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if ($lastTokenType) { |
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$stack[] = $tokenFactory->create($lastTokenType, $lastToken); |
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} |
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$lastTokenType = Token::TYPE_DELIMITER; |
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$lastToken = $char; |
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} elseif ($char === '-') { |
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// Если предыдущий токен не число и не закрывающая скобка, |
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// то минус означает отрицательное число |
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if (!$lastTokenType) { |
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$lastTokenType = Token::TYPE_NUMBER; |
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} elseif ($lastTokenType === Token::TYPE_NUMBER |
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|| $lastToken === ')' |
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) { |
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$stack[] = $tokenFactory->create($lastTokenType, $lastToken); |
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$lastTokenType = Token::TYPE_OPERATOR; |
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} else { |
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$stack[] = $tokenFactory->create($lastTokenType, $lastToken); |
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$lastTokenType = Token::TYPE_NUMBER; |
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} |
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$lastToken = $char; |
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} elseif (preg_match("/[\+\*\/\^]+/i", $char)) { |
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if ($lastTokenType) { |
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$stack[] = $tokenFactory->create($lastTokenType, $lastToken); |
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} |
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$lastTokenType = Token::TYPE_OPERATOR; |
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$lastToken = $char; |
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// Начало переменной |
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} elseif ($char === '$') { |
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if (!$lastTokenType) { |
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$lastTokenType = Token::TYPE_VARIABLE; |
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$lastToken = $char; |
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} else { |
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$stack[] = $tokenFactory->create($lastTokenType, $lastToken); |
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$lastTokenType = Token::TYPE_VARIABLE; |
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$lastToken = $char; |
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} |
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// Буквы a-z, A-Z или символ подчеркивания |
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// (могут использоваться в именах переменных и функций) |
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View Code Duplication |
} elseif (preg_match("/[a-zA-Z\_]+/i", $char)) { |
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if (!$lastTokenType) { |
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$lastTokenType = Token::TYPE_FUNCTION; |
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$lastToken = $char; |
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} elseif ($lastTokenType === Token::TYPE_FUNCTION |
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|| $lastTokenType === Token::TYPE_VARIABLE |
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) { |
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$lastToken .= $char; |
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} else { |
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$stack[] = $tokenFactory->create($lastTokenType, $lastToken); |
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$lastTokenType = Token::TYPE_FUNCTION; |
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$lastToken = $char; |
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} |
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// Числа |
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} elseif (is_numeric($char) || $char === '.') { |
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View Code Duplication |
if (!$lastTokenType) { |
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$lastTokenType = Token::TYPE_NUMBER; |
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$lastToken = $char; |
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} elseif ($lastTokenType === Token::TYPE_NUMBER |
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|| $lastTokenType === Token::TYPE_VARIABLE |
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|| $lastTokenType === Token::TYPE_FUNCTION |
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) { |
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$lastToken .= $char; |
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} else { |
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$stack[] = $tokenFactory->create($lastTokenType, $lastToken); |
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$lastTokenType = Token::TYPE_NUMBER; |
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$lastToken = $char; |
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} |
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} |
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} |
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$stack[] = $tokenFactory->create($lastTokenType, $lastToken); |
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return $stack; |
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} |
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} |
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Sufir /
php-calc
