Merge pull request #28 from phpfui/support_for_double_quoted_strings

Support for double quoted strings

src/NXP/Classes/Calculator.php

@@ -13,6 +13,7 @@ namespace NXP\Classes;
 use NXP\Classes\Token\InterfaceOperator;
 use NXP\Classes\Token\TokenFunction;
 use NXP\Classes\Token\TokenNumber;
+use NXP\Classes\Token\TokenString;
 use NXP\Classes\Token\TokenVariable;
 use NXP\Exception\IncorrectExpressionException;
 use NXP\Exception\UnknownVariableException;
@@ -32,11 +33,14 @@ class Calculator
      */
     public function calculate($tokens, $variables)
     {
-        $stack = array();
+        $stack = [];
         foreach ($tokens as $token) {
             if ($token instanceof TokenNumber) {
                 array_push($stack, $token);
             }
+            if ($token instanceof TokenString) {
+                array_push($stack, $token);
+            }
             if ($token instanceof TokenVariable) {
                 $variable = $token->getValue();
                 if (!array_key_exists($variable, $variables)) {

src/NXP/Classes/Lexer.php

@@ -17,6 +17,7 @@ use NXP\Classes\Token\TokenLeftBracket;
 use NXP\Classes\Token\TokenNumber;
 use NXP\Classes\Token\TokenRightBracket;
 use NXP\Classes\Token\TokenVariable;
+use NXP\Classes\Token\TokenString;
 use NXP\Exception\IncorrectBracketsException;
 use NXP\Exception\IncorrectExpressionException;
 
@@ -42,7 +43,7 @@ class Lexer
      */
     public function stringToTokensStream($input)
     {
-        $matches = array();
+        $matches = [];
         preg_match_all($this->tokenFactory->getTokenParserRegex(), $input, $matches);
         $tokenFactory = $this->tokenFactory;
         $tokensStream = array_map(
@@ -62,10 +63,13 @@ class Lexer
      */
     public function buildReversePolishNotation($tokensStream)
     {
-        $output = array();
-        $stack = array();
+        $output = [];
+        $stack = [];
 
         foreach ($tokensStream as $token) {
+            if ($token instanceof TokenString) {
+                $output[] = $token;
+            }
             if ($token instanceof TokenNumber) {
                 $output[] = $token;
             }

src/NXP/Classes/Token/TokenFunction.php

@@ -29,7 +29,7 @@ class TokenFunction extends AbstractContainerToken implements InterfaceFunction
      */
     public function execute(&$stack)
     {
-        $args = array();
+        $args = [];
         list($places, $function) = $this->value;
         for ($i = 0; $i < $places; $i++) {
             array_push($args, array_pop($stack)->getValue());

src/NXP/Classes/Token/TokenString.php

@@ -0,0 +1,25 @@
+<?php
+/**
+ * This file is part of the MathExecutor package
+ *
+ * (c) Alexander Kiryukhin
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code
+ */
+
+namespace NXP\Classes\Token;
+
+/**
+ * @author Bruce Wells <brucekwells@gmail.com>
+ */
+class TokenString extends AbstractContainerToken
+{
+    /**
+     * @return string
+     */
+    public static function getRegex()
+    {
+        return '"([^"]|"")*"';
+    }
+}

src/NXP/Classes/TokenFactory.php

@@ -17,6 +17,7 @@ use NXP\Classes\Token\TokenLeftBracket;
 use NXP\Classes\Token\TokenNumber;
 use NXP\Classes\Token\TokenRightBracket;
 use NXP\Classes\Token\TokenVariable;
+use NXP\Classes\Token\TokenString;
 use NXP\Exception\UnknownFunctionException;
 use NXP\Exception\UnknownOperatorException;
 use NXP\Exception\UnknownTokenException;
@@ -31,27 +32,26 @@ class TokenFactory
      *
      * @var array
      */
-    protected $operators = array();
+    protected $operators = [];
 
     /**
      * Available functions
      *
      * @var array
      */
-    protected $functions = array();
+    protected $functions = [];
 
     /**
      * Add function
-     * @param $name
-     * @param $function
-     * @param $places
+     * @param string   $name
+     * @param callable $function
+     * @param int      $places
      */
-    public function addFunction($name, $function, $places = 1)
+    public function addFunction($name, callable $function, $places = 1)
     {
-        $this->functions[$name] = array($places, $function);
+        $this->functions[$name] = [$places, $function];
     }
 
-
     /**
      * get functions
      *
@@ -90,16 +90,6 @@ class TokenFactory
         return $this->operators;
     }
 
-    /**
-     * Add variable
-     * @param string $name
-     * @param mixed  $value
-     */
-    public function addVariable($name, $value)
-    {
-
-    }
-
     /**
      * @return string
      */
@@ -111,8 +101,9 @@ class TokenFactory
         }
 
         return sprintf(
-            '/(%s)|([%s])|(%s)|(%s)|([%s%s%s])/i',
+            '/(%s)|(%s)|([%s])|(%s)|(%s)|([%s%s%s])/i',
             TokenNumber::getRegex(),
+            TokenString::getRegex(),
             $operatorsRegex,
             TokenFunction::getRegex(),
             TokenVariable::getRegex(),
@@ -141,6 +132,10 @@ class TokenFactory
             return new TokenRightBracket();
         }
 
+        if ($token[0] == '"') {
+            return new TokenString(str_replace('"', '', $token));
+        }
+
         if ($token == ',') {
             return new TokenComma();
         }

src/NXP/Exception/IncorrectBracketsException.php

@@ -14,6 +14,6 @@ namespace NXP\Exception;
 /**
  * @author Alexander Kiryukhin <alexander@symdev.org>
  */
-class IncorrectBracketsException extends \Exception
+class IncorrectBracketsException extends MathExecutorException
 {
 }

src/NXP/Exception/IncorrectExpressionException.php

@@ -14,6 +14,6 @@ namespace NXP\Exception;
 /**
  * @author Vitaliy Zhuk <zhuk2205@gmail.com>
  */
-class IncorrectExpressionException extends \Exception
+class IncorrectExpressionException extends MathExecutorException
 {
 }

src/NXP/Exception/UnknownFunctionException.php

@@ -14,6 +14,6 @@ namespace NXP\Exception;
 /**
  * @author Vitaliy Zhuk <zhuk2205@gmail.com>
  */
-class UnknownFunctionException extends \Exception
+class UnknownFunctionException extends MathExecutorException
 {
 }

src/NXP/Exception/UnknownOperatorException.php

@@ -14,6 +14,6 @@ namespace NXP\Exception;
 /**
  * @author Vitaliy Zhuk <zhuk2205@gmail.com>
  */
-class UnknownOperatorException extends \Exception
+class UnknownOperatorException extends MathExecutorException
 {
 }

src/NXP/Exception/UnknownTokenException.php

@@ -14,6 +14,6 @@ namespace NXP\Exception;
 /**
  * @author Vitaliy Zhuk <zhuk2205@gmail.com>
  */
-class UnknownTokenException extends \Exception
+class UnknownTokenException extends MathExecutorException
 {
 }

src/NXP/Exception/UnknownVariableException.php

@@ -14,6 +14,6 @@ namespace NXP\Exception;
 /**
  * @author Alexander Kiryukhin <alexander@symdev.org>
  */
-class UnknownVariableException extends \Exception
+class UnknownVariableException extends MathExecutorException
 {
 }

src/NXP/MathExecutor.php

@@ -15,6 +15,7 @@ use NXP\Classes\Calculator;
 use NXP\Classes\Lexer;
 use NXP\Classes\Token;
 use NXP\Classes\TokenFactory;
+use NXP\Exception\UnknownVariableException;
 
 /**
  * Class MathExecutor
@@ -27,7 +28,7 @@ class MathExecutor
      *
      * @var array
      */
-    private $variables = array();
+    private $variables = [];
 
     /**
      * @var TokenFactory
@@ -37,7 +38,7 @@ class MathExecutor
     /**
      * @var array
      */
-    private $cache = array();
+    private $cache = [];
 
     /**
      * Base math operators
@@ -75,10 +76,36 @@ class MathExecutor
         $this->tokenFactory->addFunction('max', 'max', 2);
         $this->tokenFactory->addFunction('avg', function($arg1, $arg2) { return ($arg1 + $arg2) / 2; }, 2);
 
-        $this->setVars(array(
+        $this->setVars([
             'pi' => 3.14159265359,
             'e'  => 2.71828182846
-        ));
+        ]);
+    }
+
+    /**
+     * Get all vars
+     *
+     * @return array
+     */
+    public function getVars()
+    {
+        return $this->variables;
+    }
+
+    /**
+     * Get a specific var
+     *
+     * @param  string        $variable
+     * @return integer|float
+     * @throws UnknownVariableException
+     */
+    public function getVar($variable)
+    {
+        if (! isset($this->variables[$variable])) {
+            throw new UnknownVariableException("Variable ({$variable}) not set");
+        }
+
+        return $this->variables[$variable];
     }
 
     /**
@@ -86,7 +113,6 @@ class MathExecutor
      *
      * @param  string        $variable
      * @param  integer|float $value
-     * @throws \Exception
      * @return MathExecutor
      */
     public function setVar($variable, $value)
@@ -138,7 +164,7 @@ class MathExecutor
      */
     public function removeVars()
     {
-        $this->variables = array();
+        $this->variables = [];
 
         return $this;
     }

tests/MathTest.php

@@ -27,7 +27,7 @@ class MathTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals($calculator->execute($expression), $phpResult);
     }
 
-    public function testZeroDevision()
+    public function testZeroDivision()
     {
         $calculator = new MathExecutor();
         $this->assertEquals($calculator->execute('1 / 0'), 0);
@@ -44,35 +44,35 @@ class MathTest extends \PHPUnit_Framework_TestCase
      */
     public function providerExpressions()
     {
-        return array(
-            array('0.1 + 0.2'),
-            array('1 + 2'),
+        return [
+            ['0.1 + 0.2'],
+            ['1 + 2'],
 
-            array('0.1 - 0.2'),
-            array('1 - 2'),
+            ['0.1 - 0.2'],
+            ['1 - 2'],
 
-            array('0.1 * 2'),
-            array('1 * 2'),
+            ['0.1 * 2'],
+            ['1 * 2'],
 
-            array('0.1 / 0.2'),
-            array('1 / 2'),
+            ['0.1 / 0.2'],
+            ['1 / 2'],
 
-            array('2 * 2 + 3 * 3'),
+            ['2 * 2 + 3 * 3'],
 
-            array('1 + 0.6 - 3 * 2 / 50'),
+            ['1 + 0.6 - 3 * 2 / 50'],
 
-            array('(5 + 3) * -1'),
+            ['(5 + 3) * -1'],
 
-            array('2+2*2'),
-            array('(2+2)*2'),
-            array('(2+2)*-2'),
-            array('(2+-2)*2'),
+            ['2+2*2'],
+            ['(2+2)*2'],
+            ['(2+2)*-2'],
+            ['(2+-2)*2'],
 
-            array('sin(10) * cos(50) / min(10, 20/2)'),
+            ['sin(10) * cos(50) / min(10, 20/2)'],
 
-            array('100500 * 3.5E5'),
-            array('100500 * 3.5E-5')
-        );
+            ['100500 * 3.5E5'],
+            ['100500 * 3.5E-5'],
+        ];
     }
 
     public function testFunction()