functions.php ➔ _merge_args() - Code Metrics - Inspection of "Don't overwrite given arguments" - matteosister/php-curry - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#9)

by Arnold

created 2018-09-29 02:28 UTC

functions.php ➔ _merge_args() A

↳ Parent: Project

Complexity

Conditions	4
Paths	4

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	1
CRAP Score	4

Importance

Changes

Metric	Value
cc	4
nc	4
nop	3
dl	0
loc	13
ccs	1
cts	1
cp	1
crap	4
rs	9.8333
c	0
b	0
f	0

<?php

namespace Cypress\Curry;

use Cypress\Curry\Placeholder;

/**
 * @param callable $callable
 * @return callable
 */
function curry($callable)
{
    if (_number_of_required_params($callable) === 0) {
        return _make_function($callable);
    }
    if (_number_of_required_params($callable) === 1) {
        return _curry_array_args($callable, _rest(func_get_args()));
    }

    return _curry_array_args($callable, _rest(func_get_args()));
}

/**
 * @param $callable
 * @param array $args pass the arguments to be curried as an array
 *
 * @return callable
 */
function curry_args($callable, array $args)
{
    return _curry_array_args($callable, $args);
}

/**
 * @param callable $callable
 * @return callable
 */
function curry_right($callable)
{
    if (_number_of_required_params($callable) < 2)
        return _make_function($callable);
    return _curry_array_args($callable, _rest(func_get_args()), false);
}

/**
 * @param callable $callable
 * @param array $args pass the arguments to be curried as an array
 *
 * @return callable
 */
function curry_right_args($callable, array $args)
{
    return _curry_array_args($callable, $args, false);
}

/**
 * @param callable $callable
 * @param $args
 * @param bool $left
 * @return callable
 */
function _curry_array_args($callable, $args, $left = true)
{
    return function () use ($callable, $args, $left) {
        $newArgs = _merge_args($args, func_get_args(), $left);

        if (_is_fullfilled($callable, $newArgs)) {
            return _execute($callable, $newArgs, $left);
        }
        return _curry_array_args($callable, $newArgs, $left);
    };
}

/**
 * @internal
 * @param $callable
 * @param $args
 * @param $left
 * @return mixed
 */
function _execute($callable, $args, $left)
{
    if (! $left) {
        $args = array_reverse($args);
    }

    $n = _number_of_required_params($callable);

    if (count($args) > $n) {
        $extra = array_splice($args, $left ? $n : 0, count($args) - $n);
        $args = array_merge($args, $left ? $extra : array_reverse($extra));
    }

    return call_user_func_array($callable, $args);
}

/**
 * @internal
 * @param array $args
 * @return array
 */
function _rest(array $args)
{
    return array_slice($args, 1);
}

/**
 * @internal
 * @param callable $callable
 * @param $args
 * @return bool
 */
function _is_fullfilled($callable, $args)
{
    return count($args) >= _number_of_required_params($callable) &&
        !in_array(Placeholder::get(), $args, true);
}

/**
 * @internal
 * @param $callable
 * @return int
 */
function _number_of_required_params($callable)
{
    if (is_array($callable)) {
        $refl = new \ReflectionClass($callable[0]);
        $method = $refl->getMethod($callable[1]);
        return $method->getNumberOfRequiredParameters();
    }
    $refl = new \ReflectionFunction($callable);
    return $refl->getNumberOfRequiredParameters();
}

/**
 * if the callback is an array(instance, method), 
 * it returns an equivalent function for PHP 5.3 compatibility.
 *
 * @internal 
 * @param  callable $callable
 * @return callable
 */
function _make_function($callable)
{
    if (is_array($callable))
        return function() use($callable) {
            return call_user_func_array($callable, func_get_args());
        };
    return $callable;
}

/**
 * Checks if an argument is a placeholder.
 *
 * @internal
 * @param  mixed  $arg
 * @return boolean
 */
function _is_placeholder($arg)
{
    return $arg instanceof Placeholder;
}

/**
 * Merge arguments, replacing placeholders
 */
function _merge_args($args, $newArgs, $left = true)

{
    foreach ($args as &$arg) {
        if (!_is_placeholder($arg))
            continue;

        $arg = array_shift($newArgs);
        if (empty($newArgs))
            break;
    }

    return array_merge($args, $newArgs);
}

/**
 * Gets a special placeholder value used to specify "gaps" within curried 
 * functions, allowing partial application of any combination of arguments, 
 * regardless of their positions. Should be used only for required arguments.
 * When used, optional arguments must be at the end of the arguments list.
 *
 * @return Cypress\Curry\Placeholder
 */
function __()
{
    return Placeholder::get();
}


1		<?php
2
3		namespace Cypress\Curry;
4
5		use Cypress\Curry\Placeholder;
6
7		/**
8		* @param callable $callable
9		* @return callable
10		*/
11		function curry($callable)
12		{
13	9	if (_number_of_required_params($callable) === 0) {
14	9	return _make_function($callable);
15	7	}
16		if (_number_of_required_params($callable) === 1) {
17		return _curry_array_args($callable, _rest(func_get_args()));
18		}
19
20		return _curry_array_args($callable, _rest(func_get_args()));
21		}
22
23		/**
24		* @param $callable
25		* @param array $args pass the arguments to be curried as an array
26	2	*
27		* @return callable
28		*/
29		function curry_args($callable, array $args)
30		{
31		return _curry_array_args($callable, $args);
32		}
33
34		/**
35	4	* @param callable $callable
36	4	* @return callable
37	4	*/
38		function curry_right($callable)
39		{
40		if (_number_of_required_params($callable) < 2)
41		return _make_function($callable);
42		return _curry_array_args($callable, _rest(func_get_args()), false);
43		}
44
45		/**
46		* @param callable $callable
47		* @param array $args pass the arguments to be curried as an array
48	3	*
49		* @return callable
50		*/
51		function curry_right_args($callable, array $args)
52		{
53		return _curry_array_args($callable, $args, false);
54		}
55
56		/**
57		* @param callable $callable
58		* @param $args
59		* @param bool $left
60	15	* @return callable
61	4	*/
62		function _curry_array_args($callable, $args, $left = true)
63	11	{
64	11	return function () use ($callable, $args, $left) {
65	11	$newArgs = _merge_args($args, func_get_args(), $left);
66
67	6	if (_is_fullfilled($callable, $newArgs)) {
68	15	return _execute($callable, $newArgs, $left);
69		}
70		return _curry_array_args($callable, $newArgs, $left);
71		};
72		}
73
74		/**
75		* @internal
76		* @param $callable
77		* @param $args
78		* @param $left
79		* @return mixed
80	15	*/
81	7	function _execute($callable, $args, $left)
82	7	{
83		if (! $left) {
84	15	$args = array_reverse($args);
85	15	}
86	1
87	1	$n = _number_of_required_params($callable);
88
89		if (count($args) > $n) {
90		$extra = array_splice($args, $left ? $n : 0, count($args) - $n);
91		$args = array_merge($args, $left ? $extra : array_reverse($extra));
92		}
93	1
94	1	return call_user_func_array($callable, $args);
95	1	}
96	1
97	1	/**
98		* @internal
99	15	* @param array $args
100		* @return array
101		*/
102		function _rest(array $args)
103		{
104		return array_slice($args, 1);
105		}
106
107		/**
108		* @internal
109	11	* @param callable $callable
110		* @param $args
111		* @return bool
112		*/
113		function _is_fullfilled($callable, $args)
114		{
115		return count($args) >= _number_of_required_params($callable) &&
116		!in_array(Placeholder::get(), $args, true);
117		}
118
119		/**
120		* @internal
121	20	* @param $callable
122	22	* @return int
123	22	*/
124		function _number_of_required_params($callable)
125		{
126		if (is_array($callable)) {
127		$refl = new \ReflectionClass($callable[0]);
128		$method = $refl->getMethod($callable[1]);
129		return $method->getNumberOfRequiredParameters();
130		}
131		$refl = new \ReflectionFunction($callable);
132		return $refl->getNumberOfRequiredParameters();
133	24	}
134	16
135	16	/**
136	16	* if the callback is an array(instance, method),
137		* it returns an equivalent function for PHP 5.3 compatibility.
138	8	*
139	8	* @internal
140		* @param callable $callable
141		* @return callable
142		*/
143		function _make_function($callable)
144		{
145		if (is_array($callable))
146		return function() use($callable) {
147		return call_user_func_array($callable, func_get_args());
148		};
149		return $callable;
150		}
151
152	3	/**
153		* Checks if an argument is a placeholder.
154	1	*
155	1	* @internal
156	2	* @param mixed $arg
157		* @return boolean
158		*/
159		function _is_placeholder($arg)
160		{
161		return $arg instanceof Placeholder;
162		}
163
164		/**
165		* Merge arguments, replacing placeholders
166		*/
167		function _merge_args($args, $newArgs, $left = true)
		0 ignored issues – show Unused Code introduced 2018-09-29 01:13 UTC by Report Bug Copy Issue Report The parameter `$left` is not used and could be removed. This check looks from parameters that have been defined for a function or method, but which are not used in the method body. Loading history...
168	20	{
169		foreach ($args as &$arg) {
170		if (!_is_placeholder($arg))
171		continue;
172
173		$arg = array_shift($newArgs);
174		if (empty($newArgs))
175		break;
176		}
177
178		return array_merge($args, $newArgs);
179		}
180	15
181		/**
182		* Gets a special placeholder value used to specify "gaps" within curried
183		* functions, allowing partial application of any combination of arguments,
184		* regardless of their positions. Should be used only for required arguments.
185		* When used, optional arguments must be at the end of the arguments list.
186		*
187		* @return Cypress\Curry\Placeholder
188		*/
189		function __()
190		{
191		return Placeholder::get();
192		}
193

matteosister / php-curry

Pull Request — master (#9)

functions.php ➔ _merge_args() A

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