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<?php |
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/* |
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Copyright (c) 2016 Michal Čihař <[email protected]> |
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This file is part of SimpleMath. |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License along |
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with this program; if not, write to the Free Software Foundation, Inc., |
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
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*/ |
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namespace SimpleMath; |
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abstract class Expression { |
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protected $value = ''; |
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protected $precidence = 0; |
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protected $leftAssoc = true; |
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public function __construct($value) { |
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$this->value = $value; |
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} |
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public function getPrecidence() { |
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return $this->precidence; |
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} |
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public function isLeftAssoc() { |
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return $this->leftAssoc; |
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} |
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public function isOpen() { |
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return false; |
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} |
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public static function factory($value) { |
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if (is_object($value) && $value instanceof Expression) { |
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return $value; |
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} elseif (is_numeric($value)) { |
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return new Expressions\Number($value); |
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} elseif (preg_match('/^\$?[a-z]+$/', $value)) { |
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return new Expressions\Variable($value); |
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} |
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switch ($value) { |
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case '+': |
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return new Expressions\Addition($value); |
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case '-': |
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return new Expressions\Subtraction($value); |
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case '*': |
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return new Expressions\Multiplication($value); |
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case '/': |
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return new Expressions\Division($value); |
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case '%': |
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return new Expressions\Modulo($value); |
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case '?': |
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case ':': |
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return new Expressions\Ternary($value); |
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case '(': |
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case ')': |
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return new Expressions\Parenthesis($value); |
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case '==': |
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return new Expressions\ComparisonEQ($value); |
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case '<': |
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return new Expressions\ComparisonLT($value); |
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case '>': |
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return new Expressions\ComparisonGT($value); |
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case '<=': |
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return new Expressions\ComparisonLTE($value); |
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case '>=': |
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return new Expressions\ComparisonGTE($value); |
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case '!=': |
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return new Expressions\ComparisonNE($value); |
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case '||': |
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return new Expressions\OperatorOr($value); |
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case '&&': |
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return new Expressions\OperatorAnd($value); |
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} |
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throw new \Exception('Undefined Value ' . $value); |
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} |
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abstract public function operate(Stack $stack, $variables=array()); |
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public function isOperator() { |
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return false; |
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} |
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public function isParenthesis() { |
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return false; |
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} |
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public function render() { |
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return $this->value; |
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} |
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} |
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phpmyadmin /
simple-math
