functions.php ➔ _last() - Code Metrics - Inspection of "Merge pull request #5 from webNeat/master" - matteosister/php-curry - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 7da718...9c5b3d )

by Matteo

created 2016-07-05 19:14 UTC

functions.php ➔ _last() A

↳ Parent: Project

Complexity

Conditions	1
Paths	1

Size

Total Lines	4
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	1
CRAP Score	1

Importance

Changes	1
Bugs	0	Features	1

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

<?php

namespace Cypress\Curry;

use Cypress\Curry\Placeholder;

/**
 * @param callable $callable
 * @return callable
 */
function curry($callable)
{
    if (_number_of_required_params($callable) < 2)
        return _make_function($callable);
    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, $left) {
        if (_is_fullfilled($callable, $args)) {
            return _execute($callable, $args, $left);
        }
        $newArgs = array_merge($args, func_get_args());
        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);
    }

    $placeholders = _placeholder_positions($args);
    if (0 < count($placeholders)) {
        $n = _number_of_required_params($callable);
        if ($n <= _last($placeholders[count($placeholders) - 1])) {
            // This means that we have more placeholders then needed
            // I know that throwing exceptions is not really the 
            // functional way, but this case should not happen.
            throw new \Exception("Argument Placeholder found on unexpected position !");
        }
        foreach ($placeholders as $i) {
            $args[$i] = $args[$n];
            array_splice($args, $n, 1);
        }
    }

    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)
{
    $args = array_filter($args, function($arg) {
        return ! _is_placeholder($arg);
    });
    return count($args) >= _number_of_required_params($callable);
}

/**
 * @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;
}

/**
 * Gets an array of placeholders positions in the given arguments.
 *
 * @internal
 * @param  array $args
 * @return array
 */
function _placeholder_positions($args)
{
    return array_keys(array_filter($args, 'Cypress\\Curry\\_is_placeholder'));
}

/**
 * Get the last element in an array.
 *
 * @internal
 * @param  array $array
 * @return mixed
 */
function _last($array)
{
    return $array[count($array) - 1];
}

/**
 * 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($callable) < 2)
14	9	return _make_function($callable);
15	7	return _curry_array_args($callable, _rest(func_get_args()));
16		}
17
18		/**
19		* @param $callable
20		* @param array $args pass the arguments to be curried as an array
21		*
22		* @return callable
23		*/
24		function curry_args($callable, array $args)
25		{
26	2	return _curry_array_args($callable, $args);
27		}
28
29		/**
30		* @param callable $callable
31		* @return callable
32		*/
33		function curry_right($callable)
34		{
35	4	if (_number_of_required_params($callable) < 2)
36	4	return _make_function($callable);
37	4	return _curry_array_args($callable, _rest(func_get_args()), false);
38		}
39
40		/**
41		* @param callable $callable
42		* @param array $args pass the arguments to be curried as an array
43		*
44		* @return callable
45		*/
46		function curry_right_args($callable, array $args)
47		{
48	3	return _curry_array_args($callable, $args, false);
49		}
50
51		/**
52		* @param callable $callable
53		* @param $args
54		* @param bool $left
55		* @return callable
56		*/
57		function _curry_array_args($callable, $args, $left = true)
58		{
59		return function () use ($callable, $args, $left) {
60	15	if (_is_fullfilled($callable, $args)) {
61	4	return _execute($callable, $args, $left);
62		}
63	11	$newArgs = array_merge($args, func_get_args());
64	11	if (_is_fullfilled($callable, $newArgs)) {
65	11	return _execute($callable, $newArgs, $left);
66		}
67	6	return _curry_array_args($callable, $newArgs, $left);
68	15	};
69		}
70
71		/**
72		* @internal
73		* @param $callable
74		* @param $args
75		* @param $left
76		* @return mixed
77		*/
78		function _execute($callable, $args, $left)
79		{
80	15	if (! $left) {
81	7	$args = array_reverse($args);
82	7	}
83
84	15	$placeholders = _placeholder_positions($args);
85	15	if (0 < count($placeholders)) {
86	1	$n = _number_of_required_params($callable);
87	1	if ($n <= _last($placeholders[count($placeholders) - 1])) {
88		// This means that we have more placeholders then needed
89		// I know that throwing exceptions is not really the
90		// functional way, but this case should not happen.
91		throw new \Exception("Argument Placeholder found on unexpected position !");
92		}
93	1	foreach ($placeholders as $i) {
94	1	$args[$i] = $args[$n];
95	1	array_splice($args, $n, 1);
96	1	}
97	1	}
98
99	15	return call_user_func_array($callable, $args);
100		}
101
102		/**
103		* @internal
104		* @param array $args
105		* @return array
106		*/
107		function _rest(array $args)
108		{
109	11	return array_slice($args, 1);
110		}
111
112		/**
113		* @internal
114		* @param callable $callable
115		* @param $args
116		* @return bool
117		*/
118		function _is_fullfilled($callable, $args)
119		{
120		$args = array_filter($args, function($arg) {
121	20	return ! _is_placeholder($arg);
122	22	});
123	22	return count($args) >= _number_of_required_params($callable);
124		}
125
126		/**
127		* @internal
128		* @param $callable
129		* @return int
130		*/
131		function _number_of_required_params($callable)
132		{
133	24	if (is_array($callable)) {
134	16	$refl = new \ReflectionClass($callable[0]);
135	16	$method = $refl->getMethod($callable[1]);
136	16	return $method->getNumberOfRequiredParameters();
137		}
138	8	$refl = new \ReflectionFunction($callable);
139	8	return $refl->getNumberOfRequiredParameters();
140		}
141
142		/**
143		* if the callback is an array(instance, method),
144		* it returns an equivalent function for PHP 5.3 compatibility.
145		*
146		* @internal
147		* @param callable $callable
148		* @return callable
149		*/
150		function _make_function($callable)
151		{
152	3	if (is_array($callable))
153		return function() use($callable) {
154	1	return call_user_func_array($callable, func_get_args());
155	1	};
156	2	return $callable;
157		}
158
159		/**
160		* Checks if an argument is a placeholder.
161		*
162		* @internal
163		* @param mixed $arg
164		* @return boolean
165		*/
166		function _is_placeholder($arg)
167		{
168	20	return $arg instanceof Placeholder;
169		}
170
171		/**
172		* Gets an array of placeholders positions in the given arguments.
173		*
174		* @internal
175		* @param array $args
176		* @return array
177		*/
178		function _placeholder_positions($args)
179		{
180	15	return array_keys(array_filter($args, 'Cypress\\Curry\\_is_placeholder'));
181		}
182
183		/**
184		* Get the last element in an array.
185		*
186		* @internal
187		* @param array $array
188		* @return mixed
189		*/
190		function _last($array)
191		{
192	1	return $array[count($array) - 1];
193		}
194
195		/**
196		* Gets a special placeholder value used to specify "gaps" within curried
197		* functions, allowing partial application of any combination of arguments,
198		* regardless of their positions. Should be used only for required arguments.
199		* When used, optional arguments must be at the end of the arguments list.
200		*
201		* @return Cypress\Curry\Placeholder
202		*/
203		function __()
204		{
205	1	return Placeholder::get();
206		}
207

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