Expression::parse() - Code Metrics - zicht/z - Measure and Improve Code Quality continuously with Scrutinizer

Expression::parse() F
last analyzed 2017-06-16 11:38 UTC

↳ Parent: Expression

Complexity

Conditions	30
Paths	281

Size

Total Lines	119
Code Lines	90

Duplication

Lines	11
Ratio	9.24 %

Code Coverage

Tests	69
CRAP Score	53.3172

Importance

Changes

Metric	Value
c	0
b	0
f	0
dl	11
loc	119
ccs	69
cts	98
cp	0.704
rs	3.4683
cc	30
eloc	90
nc	281
nop	1
crap	53.3172

How to fix Long Method Complexity

<?php
/**
 * For licensing information, please see the LICENSE file accompanied with this file.
 *
 * @author Gerard van Helden <[email protected]>
 * @copyright 2012 Gerard van Helden <http://melp.nl>
 */

namespace Zicht\Tool\Script\Parser;

use Zicht\Tool\Script\Token;
use Zicht\Tool\Script\Node;
use Zicht\Tool\Script\Node\Expr\Op;
use Zicht\Tool\Script\AbstractParser;
use Zicht\Tool\Script\TokenStream;

/**
 * Expression parser
 */
class Expression extends AbstractParser
{
    /**
     * Unary prefix operators
     *
     * @var array
     */
    public static $PREFIX_UNARY = array('!', '-', '~');

    /**
     * Binary infix operators
     *
     * @var array
     */
    public static $INFIX_BINARY = array(
        '==', '!=', '<=', '>=', '<', '>', '&&', '||', '=~',
        '+', '*', '/', '-'
    );


    /**
     * Does a recursive descent parsing of the token stream and returns the resulting node.
     *
     * @param \Zicht\Tool\Script\TokenStream $stream
     * @return \Zicht\Tool\Script\Node\Node
     */
    public function parse(TokenStream $stream)
    {
        if ($stream->match(Token::OPERATOR, array('!', '-'))) {
function acceptsInteger($int) { }

$x = '123'; // string "123"

// Instead of
acceptsInteger($x);

// we recommend to use
acceptsInteger((integer) $x);
            $value = $stream->current()->value;
            $stream->next();
            $ret = new Op\Unary($value, $this->parse($stream));

        } elseif ($stream->match(Token::KEYWORD, array('true', 'false'))) {
function acceptsInteger($int) { }

$x = '123'; // string "123"

// Instead of
acceptsInteger($x);

// we recommend to use
acceptsInteger((integer) $x);
            $ret = new Node\Expr\Literal($stream->current()->value === 'true');
            $stream->next();
        } elseif ($stream->match(Token::KEYWORD, 'null')) {
            $ret = new Node\Expr\Literal(null);
            $stream->next();
        } elseif ($stream->match(Token::IDENTIFIER)) {
            $name = $stream->current()->value;
            $stream->next();

            $ret = new Node\Expr\Variable($name);
        } elseif ($stream->match(Token::STRING)) {
            $ret = new Node\Expr\Str($stream->current()->value);
            $stream->next();
        } elseif ($stream->match(Token::NUMBER)) {
            $value = $stream->current()->value;
            if (strpos('.', $value) !== false) {
                $ret = new Node\Expr\Number((float)$value);
            } else {
                $ret = new Node\Expr\Number((int)$value);
            }
            $stream->next();
        } elseif ($stream->match(Token::OPERATOR, '(')) {
            $stream->next();
            $ret = new Node\Expr\Parens($this->parse($stream));

            $stream->expect(Token::OPERATOR, ')');
        } elseif ($stream->match(Token::OPERATOR, '[')) {
            $stream->next();
            $ret = new Node\Expr\ListNode();
            if (!$stream->match(Token::OPERATOR, ']')) {
                $ret->append($this->parse($stream));

                while ($stream->match(',')) {
                    $stream->next();
                    $ret->append($this->parse($stream));

                }
            }
            $stream->expect(Token::OPERATOR, ']');
        } else {
            $this->err($stream);
            return null;
        }

        if ($stream->valid()) {
            while ($stream->valid() && $stream->match(Token::OPERATOR, array('(', '.', '['))) {
function acceptsInteger($int) { }

$x = '123'; // string "123"

// Instead of
acceptsInteger($x);

// we recommend to use
acceptsInteger((integer) $x);
                $type = $stream->current();

                $stream->next();
                if ($type->value === '(') {
                    $ret = new Node\Expr\Call($ret);
                    if (!$stream->match(Token::OPERATOR, ')')) {
                        do {
                            $arg = $this->parse($stream);
                            $ret->append($arg);
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}

                            if ($stream->match(',')) {
                                $stream->next();
                            } else {
                                break;
                            }
                        } while (true);
                    }
                    $stream->expect(Token::OPERATOR, ')');
                } else {
                    $ret = new Node\Expr\Subscript($ret);

                    if ($type->value === '.') {
                        $token = $stream->expect(Token::IDENTIFIER);
                        $ret->append(new Node\Expr\Str($token->value));
                    } else {
                        $ret->append($this->parse($stream));

                    }

                    switch ($type->value) {
                        case '[':
                            $stream->expect(Token::OPERATOR, ']');
                            break;
                    }
                }
            }
        }

        if ($stream->valid()) {
            if ($stream->match(Token::OPERATOR, self::$INFIX_BINARY) || $stream->match(Token::KEYWORD, 'in')) {
function acceptsInteger($int) { }

$x = '123'; // string "123"

// Instead of
acceptsInteger($x);

// we recommend to use
acceptsInteger((integer) $x);
                $value = $stream->current()->value;
                $stream->next();
                $ret = new Op\Binary($value, $ret, $this->parse($stream));

            } elseif ($stream->match(Token::OPERATOR, '?')) {
                $stream->next();
                if ($stream->match(Token::OPERATOR, ':')) {

                    $then = null;
                } else {
                    $then = $this->parse($stream);
                }

                if ($stream->valid() && $stream->match(Token::OPERATOR, ':')) {

                    $stream->next();
                    $else = $this->parse($stream);
                } else {
                    $else = null;
                }
                $ret = new Op\Ternary('?', $ret, $then, $else);
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
            }
        }

        // little syntactic sugar for function calls without parentheses:
        $allowInlineCallTokens = array(Token::IDENTIFIER, Token::STRING, Token::NUMBER);
        if ($stream->valid() && ($stream->match($allowInlineCallTokens))) {
function acceptsInteger($int) { }

$x = '123'; // string "123"

// Instead of
acceptsInteger($x);

// we recommend to use
acceptsInteger((integer) $x);
            $ret = new Node\Expr\Call($ret);
            $ret->append($this->parse($stream));

        }

        return $ret;
    }
}


1			<?php
2			/**
3			* For licensing information, please see the LICENSE file accompanied with this file.
4			*
5			* @author Gerard van Helden <[email protected]>
6			* @copyright 2012 Gerard van Helden <http://melp.nl>
7			*/
8
9			namespace Zicht\Tool\Script\Parser;
10
11			use Zicht\Tool\Script\Token;
12			use Zicht\Tool\Script\Node;
13			use Zicht\Tool\Script\Node\Expr\Op;
14			use Zicht\Tool\Script\AbstractParser;
15			use Zicht\Tool\Script\TokenStream;
16
17			/**
18			* Expression parser
19			*/
20			class Expression extends AbstractParser
21			{
22			/**
23			* Unary prefix operators
24			*
25			* @var array
26			*/
27			public static $PREFIX_UNARY = array('!', '-', '~');
28
29			/**
30			* Binary infix operators
31			*
32			* @var array
33			*/
34			public static $INFIX_BINARY = array(
35			'==', '!=', '<=', '>=', '<', '>', '&&', '\|\|', '=~',
36			'+', '*', '/', '-'
37			);
38
39
40			/**
41			* Does a recursive descent parsing of the token stream and returns the resulting node.
42			*
43			* @param \Zicht\Tool\Script\TokenStream $stream
44			* @return \Zicht\Tool\Script\Node\Node
45			*/
46	12		public function parse(TokenStream $stream)
47			{
48	12		if ($stream->match(Token::OPERATOR, array('!', '-'))) {
			0 ignored issues – show Documentation introduced 2017-01-21 13:11 UTC by Report Bug Copy Issue Report `array('!', '-')` is of type `array<integer,string,{"0":"string","1":"string"}>`, but the function expects a `string\|null`. It seems like the type of the argument is not accepted by the function/method which you are calling. In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug. We suggest to add an explicit type cast like in the following example: function acceptsInteger($int) { } $x = '123'; // string "123" // Instead of acceptsInteger($x); // we recommend to use acceptsInteger((integer) $x); Loading history...
49			$value = $stream->current()->value;
50			$stream->next();
51			$ret = new Op\Unary($value, $this->parse($stream));
			0 ignored issues – show Bug introduced 2017-01-21 13:11 UTC by Report Bug Copy Issue Report It seems like `$this->parse($stream)` targeting `Zicht\Tool\Script\Parser\Expression::parse()` can also be of type `null`; however, `Zicht\Tool\Script\Node\E...Op\Unary::__construct()` does only seem to accept `object<Zicht\Tool\Script\Node\Node>`, maybe add an additional type check? This check looks at variables that are passed out again to other methods. If the outgoing method call has stricter type requirements than the method itself, an issue is raised. An additional type check may prevent trouble. Loading history...
52	12		} elseif ($stream->match(Token::KEYWORD, array('true', 'false'))) {
			0 ignored issues – show Documentation introduced 2017-01-21 13:11 UTC by Report Bug Copy Issue Report `array('true', 'false')` is of type `array<integer,string,{"0":"string","1":"string"}>`, but the function expects a `string\|null`. It seems like the type of the argument is not accepted by the function/method which you are calling. In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug. We suggest to add an explicit type cast like in the following example: function acceptsInteger($int) { } $x = '123'; // string "123" // Instead of acceptsInteger($x); // we recommend to use acceptsInteger((integer) $x); Loading history...
53			$ret = new Node\Expr\Literal($stream->current()->value === 'true');
54			$stream->next();
55	12		} elseif ($stream->match(Token::KEYWORD, 'null')) {
56			$ret = new Node\Expr\Literal(null);
57			$stream->next();
58	12		} elseif ($stream->match(Token::IDENTIFIER)) {
59	9		$name = $stream->current()->value;
60	9		$stream->next();
61
62	9		$ret = new Node\Expr\Variable($name);
63	12		} elseif ($stream->match(Token::STRING)) {
64	2		$ret = new Node\Expr\Str($stream->current()->value);
65	2		$stream->next();
66	5		} elseif ($stream->match(Token::NUMBER)) {
67	4		$value = $stream->current()->value;
68	4		if (strpos('.', $value) !== false) {
69			$ret = new Node\Expr\Number((float)$value);
70			} else {
71	4		$ret = new Node\Expr\Number((int)$value);
72			}
73	4		$stream->next();
74	4		} elseif ($stream->match(Token::OPERATOR, '(')) {
75			$stream->next();
76			$ret = new Node\Expr\Parens($this->parse($stream));
			0 ignored issues – show Bug introduced 2017-01-21 13:11 UTC by Report Bug Copy Issue Report It seems like `$this->parse($stream)` targeting `Zicht\Tool\Script\Parser\Expression::parse()` can also be of type `null`; however, `Zicht\Tool\Script\Node\Expr\Parens::__construct()` does only seem to accept `object<Zicht\Tool\Script\Node\Node>`, maybe add an additional type check? This check looks at variables that are passed out again to other methods. If the outgoing method call has stricter type requirements than the method itself, an issue is raised. An additional type check may prevent trouble. Loading history...
77			$stream->expect(Token::OPERATOR, ')');
78			} elseif ($stream->match(Token::OPERATOR, '[')) {
79			$stream->next();
80			$ret = new Node\Expr\ListNode();
81			if (!$stream->match(Token::OPERATOR, ']')) {
82			$ret->append($this->parse($stream));
			0 ignored issues – show Bug introduced 2017-01-21 13:11 UTC by Report Bug Copy Issue Report It seems like `$this->parse($stream)` targeting `Zicht\Tool\Script\Parser\Expression::parse()` can also be of type `null`; however, `Zicht\Tool\Script\Node\Branch::append()` does only seem to accept `object<Zicht\Tool\Script\Node\Node>`, maybe add an additional type check? This check looks at variables that are passed out again to other methods. If the outgoing method call has stricter type requirements than the method itself, an issue is raised. An additional type check may prevent trouble. Loading history...
83			while ($stream->match(',')) {
84			$stream->next();
85			$ret->append($this->parse($stream));
			0 ignored issues – show Bug introduced 2017-01-21 13:11 UTC by Report Bug Copy Issue Report It seems like `$this->parse($stream)` targeting `Zicht\Tool\Script\Parser\Expression::parse()` can also be of type `null`; however, `Zicht\Tool\Script\Node\Branch::append()` does only seem to accept `object<Zicht\Tool\Script\Node\Node>`, maybe add an additional type check? This check looks at variables that are passed out again to other methods. If the outgoing method call has stricter type requirements than the method itself, an issue is raised. An additional type check may prevent trouble. Loading history...
86			}
87			}
88			$stream->expect(Token::OPERATOR, ']');
89			} else {
90			$this->err($stream);
91			return null;
92			}
93
94	12		if ($stream->valid()) {
95	11		while ($stream->valid() && $stream->match(Token::OPERATOR, array('(', '.', '['))) {
			0 ignored issues – show Documentation introduced 2017-01-21 13:11 UTC by Report Bug Copy Issue Report `array('(', '.', '[')` is of type `array<integer,string,{"0..."string","2":"string"}>`, but the function expects a `string\|null`. It seems like the type of the argument is not accepted by the function/method which you are calling. In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug. We suggest to add an explicit type cast like in the following example: function acceptsInteger($int) { } $x = '123'; // string "123" // Instead of acceptsInteger($x); // we recommend to use acceptsInteger((integer) $x); Loading history...
96	6		$type = $stream->current();
97
98	6		$stream->next();
99	6		if ($type->value === '(') {
100	3		$ret = new Node\Expr\Call($ret);
101	3		if (!$stream->match(Token::OPERATOR, ')')) {
102			do {
103	2		$arg = $this->parse($stream);
104	2		$ret->append($arg);
			0 ignored issues – show Bug introduced 2017-01-21 13:11 UTC by Report Bug Copy Issue Report It seems like `$arg` defined by `$this->parse($stream)` on line `103` can also be of type `null`; however, `Zicht\Tool\Script\Node\Branch::append()` does only seem to accept `object<Zicht\Tool\Script\Node\Node>`, maybe add an additional type check? If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check: /** * @return array\|string */ function returnsDifferentValues($x) { if ($x) { return 'foo'; } return array(); } $x = returnsDifferentValues($y); if (is_array($x)) { // $x is an array. } If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue. Loading history...
105
106	2		if ($stream->match(',')) {
107	1		$stream->next();
108	1		} else {
109	2		break;
110			}
111	1		} while (true);
112	2		}
113	3		$stream->expect(Token::OPERATOR, ')');
114	3		} else {
115	3		$ret = new Node\Expr\Subscript($ret);
116
117	3		if ($type->value === '.') {
118	1		$token = $stream->expect(Token::IDENTIFIER);
119	1		$ret->append(new Node\Expr\Str($token->value));
120	1		} else {
121	2		$ret->append($this->parse($stream));
			0 ignored issues – show Bug introduced 2017-01-21 13:11 UTC by Report Bug Copy Issue Report It seems like `$this->parse($stream)` targeting `Zicht\Tool\Script\Parser\Expression::parse()` can also be of type `null`; however, `Zicht\Tool\Script\Node\Branch::append()` does only seem to accept `object<Zicht\Tool\Script\Node\Node>`, maybe add an additional type check? This check looks at variables that are passed out again to other methods. If the outgoing method call has stricter type requirements than the method itself, an issue is raised. An additional type check may prevent trouble. Loading history...
122			}
123
124	3		switch ($type->value) {
125	3		case '[':
126	2		$stream->expect(Token::OPERATOR, ']');
127	2		break;
128	3		}
129			}
130	6		}
131	11		}
132
133	12		if ($stream->valid()) {
134	9		if ($stream->match(Token::OPERATOR, self::$INFIX_BINARY) \|\| $stream->match(Token::KEYWORD, 'in')) {
			0 ignored issues – show Documentation introduced 2017-01-21 13:11 UTC by Report Bug Copy Issue Report `self::$INFIX_BINARY` is of type `array`, but the function expects a `string\|null`. It seems like the type of the argument is not accepted by the function/method which you are calling. In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug. We suggest to add an explicit type cast like in the following example: function acceptsInteger($int) { } $x = '123'; // string "123" // Instead of acceptsInteger($x); // we recommend to use acceptsInteger((integer) $x); Loading history...
135			$value = $stream->current()->value;
136			$stream->next();
137			$ret = new Op\Binary($value, $ret, $this->parse($stream));
			0 ignored issues – show Bug introduced 2017-01-21 13:11 UTC by Report Bug Copy Issue Report It seems like `$this->parse($stream)` targeting `Zicht\Tool\Script\Parser\Expression::parse()` can also be of type `null`; however, `Zicht\Tool\Script\Node\E...p\Binary::__construct()` does only seem to accept `object<Zicht\Tool\Script\Node\Node>`, maybe add an additional type check? This check looks at variables that are passed out again to other methods. If the outgoing method call has stricter type requirements than the method itself, an issue is raised. An additional type check may prevent trouble. Loading history...
138	9		} elseif ($stream->match(Token::OPERATOR, '?')) {
139	3		$stream->next();
140	3	View Code Duplication	if ($stream->match(Token::OPERATOR, ':')) {
			0 ignored issues – show Duplication introduced 2017-01-21 13:11 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
141	1		$then = null;
142	1		} else {
143	2		$then = $this->parse($stream);
144			}
145
146	3	View Code Duplication	if ($stream->valid() && $stream->match(Token::OPERATOR, ':')) {
			0 ignored issues – show Duplication introduced 2017-01-21 13:11 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
147	2		$stream->next();
148	2		$else = $this->parse($stream);
149	2		} else {
150	1		$else = null;
151			}
152	3		$ret = new Op\Ternary('?', $ret, $then, $else);
			0 ignored issues – show Bug introduced 2017-01-21 13:11 UTC by Report Bug Copy Issue Report It seems like `$then` can also be of type `null`; however, `Zicht\Tool\Script\Node\E...\Ternary::__construct()` does only seem to accept `object<Zicht\Tool\Script\Node\Node>`, maybe add an additional type check? If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check: /** * @return array\|string / function returnsDifferentValues($x) { if ($x) { return 'foo'; } return array(); } $x = returnsDifferentValues($y); if (is_array($x)) { // $x is an array. } If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue. Loading history... Bug introduced 2017-01-21 13:11 UTC by Report Bug Copy Issue Report It seems like `$else` can also be of type `null`; however, `Zicht\Tool\Script\Node\E...\Ternary::__construct()` does only seem to accept `object<Zicht\Tool\Script\Node\Node>`, maybe add an additional type check? If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check: /* * @return array\|string */ function returnsDifferentValues($x) { if ($x) { return 'foo'; } return array(); } $x = returnsDifferentValues($y); if (is_array($x)) { // $x is an array. } If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue. Loading history...
153	3		}
154	9		}
155
156			// little syntactic sugar for function calls without parentheses:
157	12		$allowInlineCallTokens = array(Token::IDENTIFIER, Token::STRING, Token::NUMBER);
158	12		if ($stream->valid() && ($stream->match($allowInlineCallTokens))) {
			0 ignored issues – show Documentation introduced 2017-01-21 13:11 UTC by Report Bug Copy Issue Report `$allowInlineCallTokens` is of type `array<integer,?>`, but the function expects a `string`. It seems like the type of the argument is not accepted by the function/method which you are calling. In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug. We suggest to add an explicit type cast like in the following example: function acceptsInteger($int) { } $x = '123'; // string "123" // Instead of acceptsInteger($x); // we recommend to use acceptsInteger((integer) $x); Loading history...
159	1		$ret = new Node\Expr\Call($ret);
160	1		$ret->append($this->parse($stream));
			0 ignored issues – show Bug introduced 2017-01-21 13:11 UTC by Report Bug Copy Issue Report It seems like `$this->parse($stream)` targeting `Zicht\Tool\Script\Parser\Expression::parse()` can also be of type `null`; however, `Zicht\Tool\Script\Node\Branch::append()` does only seem to accept `object<Zicht\Tool\Script\Node\Node>`, maybe add an additional type check? This check looks at variables that are passed out again to other methods. If the outgoing method call has stricter type requirements than the method itself, an issue is raised. An additional type check may prevent trouble. Loading history...
161	1		}
162
163	12		return $ret;
164			}
165			}
166

zicht / z

Expression::parse() F last analyzed 2017-06-16 11:38 UTC

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Expression::parse() F
last analyzed 2017-06-16 11:38 UTC