Calc::__construct() - Code Metrics - Inspection of "add defineVars(array) + small fixes" - Sufir/php-calc - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 542d84...357932 )

by Alexey

created 2015-12-27 09:45 UTC

Calc::__construct() A

↳ Parent: Calc

Complexity

Conditions	1
Paths	1

Size

Total Lines	4
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	3
CRAP Score	1

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
c	1
b	0
f	0
dl	0
loc	4
ccs	3
cts	3
cp	1
rs	10
cc	1
eloc	2
nc	1
nop	1
crap	1

<?php

/**
 * Calc.php
 *
 * @date 28.03.2015 0:54:24
 * @copyright Sklyarov Alexey <[email protected]>
 */

namespace Sufir\Calc;

use Closure;
use InvalidArgumentException;
use ReflectionObject;
use RuntimeException;
use SplStack;
use Sufir\Calc\Token;
use Sufir\Calc\Token\FunctionToken;
use Sufir\Calc\Token\NumberToken;
use Sufir\Calc\Token\VariableToken;

/**
 * Calc
 *
 * Description of Calc
 *
 * @author Sklyarov Alexey <[email protected]>
 * @package Sufir\Calc
 */
final class Calc
{
    private $functions = [];

    private $variables = [];

    /**
     * @param integer $scale
     */
    public function __construct($scale = 5)
    {
        bcscale($scale);
    }

    /**
     *
     * @param Token $tokens
     * @param array $variables
     * @return string
     * @throws RuntimeException
     */
    public function evaluate(array $tokens, array $variables = [])
    {
        $stack = new SplStack;

        $this->defineVars($variables);

        foreach ($tokens as $token) {
            if ($token->isNumber()) {
                $stack->push($token);

            } elseif ($token->isVariable()) {
                if (!isset($this->variables[$token->getValue()])) {
                    throw new RuntimeException(
                        "Undefined variable: «{$token}»"
                    );
                }

                $stack->push(new NumberToken($this->variables[$token->getValue()]));

            } elseif ($token->isOperator()) {
                if ($stack->count() > 1) {
                    $second = $stack->pop();
                    $first = $stack->pop();

                    $result = self::math($token->getValue(), $first->getValue(), $second->getValue());

                    $stack->push(new NumberToken($result));
                } else {
                    throw new RuntimeException(
                        "Not enough operands for a binary operator: «{$token}»"
                    );
                }

            } elseif ($token->isFunction()) {
                if (!isset($this->functions[$token->getValue()])) {
                    throw new RuntimeException("Undefined function: «{$token}()»");
                }

                $countOfArguments = $this->functions[$token->getValue()]['args'];

                if ($stack->count() < $countOfArguments) {
                    throw new RuntimeException(
                        "Wrong argenents for function «{$token}()»:"
                        . "defined {$stack->count()} expected {$countOfArguments}"
                    );
                }

                $arguments = [];
                for ($idx = 0; $idx < $countOfArguments; $idx++) {
                    $arguments[] = $stack->pop()->getValue();
                }
                $arguments = array_reverse($arguments);

                $result = call_user_func_array($this->functions[$token->getValue()]['func'], $arguments);

                if (!is_numeric($result)) {
                    throw new RuntimeException(
                        "Wrong result type of «{$token->getValue()}()» function, expected integer or float"
                    );
                }

                $stack->push(new NumberToken($result));
            }
        }

        return $stack->top()->getValue();
    }

    /**
     * Register new function.
     *
     * @param string $name
     * @param Closure $callable
     * @return \Sufir\Calc\Calc
     */
    public function registerFunction($name, Closure $callable)
    {
        $name = rtrim($name, " \t\n\r\0\x0B\(\)");
        if (!FunctionToken::validate($name)) {
            throw new InvalidArgumentException("Wrong function name «{$name}»");
        }

        $objReflector = new ReflectionObject($callable);
        $reflector = $objReflector->getMethod('__invoke');
        $parameters = $reflector->getParameters();

        $this->functions[$name] = array(
            'args' => count($parameters),
            'func' => $callable,
        );

        return $this;
    }

    /**
     * Define new variable.
     *
     * @param string $name
     * @param integer $value
     * @return \Sufir\Calc\Calc
     * @throws RuntimeException
     */
    public function defineVar($name, $value)
    {
        $name = '$' . ltrim($name, " \t\n\r\0\x0B\$");
        if (!VariableToken::validate($name)) {
            throw new InvalidArgumentException("Wrong variable name «{$name}»");
        }

        if (!is_numeric($value)) {
            throw new InvalidArgumentException(
                "Wrong type of «{$name}», expected integer or float"
            );
        }

        $this->variables[$name] = $value;

        return $this;
    }

    /**
     * Define new variables.
     * <br>
     * Array format ['varName' => 'varValue', ...]
     *
     * @param array $variables
     * @return \Sufir\Calc\Calc
     */
    public function defineVars(array $variables = [])
    {
        foreach ($variables as $name => $value) {
            $this->defineVar($name, $value);
        }

        return $this;
    }

    /**
     * @param string $operator
     * @param integer|float $firstOperand
     * @param integer|float $secondOperand
     * @return string|null
     */
    private static function math($operator, $firstOperand, $secondOperand)
    {
        switch ($operator) {
            case '^':
                return bcpow($firstOperand, $secondOperand);
            case '*':
                return bcmul($firstOperand, $secondOperand);
            case '/':
                return bcdiv($firstOperand, $secondOperand);
            case '+':
                return bcadd($firstOperand, $secondOperand);
            case '-':
                return bcsub($firstOperand, $secondOperand);
        }
    }
}


1		<?php
2
3		/**
4		* Calc.php
5		*
6		* @date 28.03.2015 0:54:24
7		* @copyright Sklyarov Alexey <[email protected]>
8		*/
9
10		namespace Sufir\Calc;
11
12		use Closure;
13		use InvalidArgumentException;
14		use ReflectionObject;
15		use RuntimeException;
16		use SplStack;
17		use Sufir\Calc\Token;
18		use Sufir\Calc\Token\FunctionToken;
19		use Sufir\Calc\Token\NumberToken;
20		use Sufir\Calc\Token\VariableToken;
21
22		/**
23		* Calc
24		*
25		* Description of Calc
26		*
27		* @author Sklyarov Alexey <[email protected]>
28		* @package Sufir\Calc
29		*/
30		final class Calc
31		{
32		private $functions = [];
33
34		private $variables = [];
35
36		/**
37		* @param integer $scale
38		*/
39	17	public function __construct($scale = 5)
40		{
41	17	bcscale($scale);
42	17	}
43
44		/**
45		*
46		* @param Token $tokens
47		* @param array $variables
48		* @return string
49		* @throws RuntimeException
50		*/
51	14	public function evaluate(array $tokens, array $variables = [])
52		{
53	14	$stack = new SplStack;
54
55	14	$this->defineVars($variables);
56
57	14	foreach ($tokens as $token) {
58	14	if ($token->isNumber()) {
59	14	$stack->push($token);
60
61	14	} elseif ($token->isVariable()) {
62	4	if (!isset($this->variables[$token->getValue()])) {
63	1	throw new RuntimeException(
64	1	"Undefined variable: «{$token}»"
65	1	);
66		}
67
68	3	$stack->push(new NumberToken($this->variables[$token->getValue()]));
69
70	14	} elseif ($token->isOperator()) {
71	12	if ($stack->count() > 1) {
72	12	$second = $stack->pop();
73	12	$first = $stack->pop();
74
75	12	$result = self::math($token->getValue(), $first->getValue(), $second->getValue());
76
77	12	$stack->push(new NumberToken($result));
78	12	} else {
79	1	throw new RuntimeException(
80	1	"Not enough operands for a binary operator: «{$token}»"
81	1	);
82		}
83
84	14	} elseif ($token->isFunction()) {
85	9	if (!isset($this->functions[$token->getValue()])) {
86	1	throw new RuntimeException("Undefined function: «{$token}()»");
87		}
88
89	8	$countOfArguments = $this->functions[$token->getValue()]['args'];
90
91	8	if ($stack->count() < $countOfArguments) {
92	1	throw new RuntimeException(
93	1	"Wrong argenents for function «{$token}()»:"
94	1	. "defined {$stack->count()} expected {$countOfArguments}"
95	1	);
96		}
97
98	7	$arguments = [];
99	7	for ($idx = 0; $idx < $countOfArguments; $idx++) {
100	4	$arguments[] = $stack->pop()->getValue();
101	4	}
102	7	$arguments = array_reverse($arguments);
103
104	7	$result = call_user_func_array($this->functions[$token->getValue()]['func'], $arguments);
105
106	7	if (!is_numeric($result)) {
107	1	throw new RuntimeException(
108	1	"Wrong result type of «{$token->getValue()}()» function, expected integer or float"
109	1	);
110		}
111
112	6	$stack->push(new NumberToken($result));
113	6	}
114	14	}
115
116	9	return $stack->top()->getValue();
117		}
118
119		/**
120		* Register new function.
121		*
122		* @param string $name
123		* @param Closure $callable
124		* @return \Sufir\Calc\Calc
125		*/
126	9	public function registerFunction($name, Closure $callable)
127		{
128	9	$name = rtrim($name, " \t\n\r\0\x0B\(\)");
129	9	if (!FunctionToken::validate($name)) {
130	1	throw new InvalidArgumentException("Wrong function name «{$name}»");
131		}
132
133	8	$objReflector = new ReflectionObject($callable);
134	8	$reflector = $objReflector->getMethod('__invoke');
135	8	$parameters = $reflector->getParameters();
136
137	8	$this->functions[$name] = array(
138	8	'args' => count($parameters),
139	8	'func' => $callable,
140		);
141
142	8	return $this;
143		}
144
145		/**
146		* Define new variable.
147		*
148		* @param string $name
149		* @param integer $value
150		* @return \Sufir\Calc\Calc
151		* @throws RuntimeException
152		*/
153	5	public function defineVar($name, $value)
154		{
155	5	$name = '$' . ltrim($name, " \t\n\r\0\x0B\$");
156	5	if (!VariableToken::validate($name)) {
157	1	throw new InvalidArgumentException("Wrong variable name «{$name}»");
158		}
159
160	4	if (!is_numeric($value)) {
161	1	throw new InvalidArgumentException(
162	1	"Wrong type of «{$name}», expected integer or float"
163	1	);
164		}
165
166	3	$this->variables[$name] = $value;
167
168	3	return $this;
169		}
170
171		/**
172		* Define new variables.
173		* <br>
174		* Array format ['varName' => 'varValue', ...]
175		*
176		* @param array $variables
177		* @return \Sufir\Calc\Calc
178		*/
179	14	public function defineVars(array $variables = [])
180		{
181	14	foreach ($variables as $name => $value) {
182	3	$this->defineVar($name, $value);
183	14	}
184
185	14	return $this;
186		}
187
188		/**
189		* @param string $operator
190		* @param integer\|float $firstOperand
191		* @param integer\|float $secondOperand
192		* @return string\|null
193		*/
194	12	private static function math($operator, $firstOperand, $secondOperand)
195		{
196		switch ($operator) {
197	12	case '^':
198	4	return bcpow($firstOperand, $secondOperand);
199	12	case '*':
200	9	return bcmul($firstOperand, $secondOperand);
201	5	case '/':
202	3	return bcdiv($firstOperand, $secondOperand);
203	5	case '+':
204	5	return bcadd($firstOperand, $secondOperand);
205	4	case '-':
206	4	return bcsub($firstOperand, $secondOperand);
207		}
208		}
209		}
210

Sufir / php-calc

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Calc::__construct() A

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