functions.php ➔ curry_right() - Code Metrics - Inspection of "Changed README.md to use `use function`" - matteosister/php-curry - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#8)

by Arnold

created 2018-09-27 19:02 UTC

functions.php ➔ curry_right() A

↳ Parent: Project

Complexity

Conditions	2
Paths	2

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	2
nc	2
nop	1
dl	0
loc	6
rs	10
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, $left) {
        if (_is_fullfilled($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			if (_number_of_required_params($callable) === 0) {
14			return _make_function($callable);
15			}
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 $args pass the arguments to be curried as an array
26			*
27			* @return callable
28			*/
29			function curry_args($callable, array $args)
30			{
31			return _curry_array_args($callable, $args);
32			}
33
34			/**
35			* @param callable $callable
36			* @return callable
37			*/
38			function curry_right($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 $args pass the arguments to be curried as an array
48			*
49			* @return callable
50			*/
51			function curry_right_args($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 $left
60			* @return callable
61			*/
62			function _curry_array_args($callable, $args, $left = true)
63			{
64			return function () use ($callable, $args, $left) {
65			if (_is_fullfilled($callable, $args)) {
66			return _execute($callable, $args, $left);
67			}
68			$newArgs = array_merge($args, func_get_args());
69			if (_is_fullfilled($callable, $newArgs)) {
70			return _execute($callable, $newArgs, $left);
71			}
72			return _curry_array_args($callable, $newArgs, $left);
73			};
74			}
75
76			/**
77			* @internal
78			* @param $callable
79			* @param $args
80			* @param $left
81			* @return mixed
82			*/
83			function _execute($callable, $args, $left)
84			{
85			if (! $left) {
86			$args = array_reverse($args);
87			}
88
89			$placeholders = _placeholder_positions($args);
90			if (0 < count($placeholders)) {
91			$n = _number_of_required_params($callable);
92			if ($n <= _last($placeholders[count($placeholders) - 1])) {
93			// This means that we have more placeholders then needed
94			// I know that throwing exceptions is not really the
95			// functional way, but this case should not happen.
96			throw new \Exception("Argument Placeholder found on unexpected position !");
97			}
98			foreach ($placeholders as $i) {
99			$args[$i] = $args[$n];
100			array_splice($args, $n, 1);
101			}
102			}
103
104			return call_user_func_array($callable, $args);
105			}
106
107			/**
108			* @internal
109			* @param array $args
110			* @return array
111			*/
112			function _rest(array $args)
113			{
114			return array_slice($args, 1);
115			}
116
117			/**
118			* @internal
119			* @param callable $callable
120			* @param $args
121			* @return bool
122			*/
123			function _is_fullfilled($callable, $args)
124			{
125			$args = array_filter($args, function($arg) {
126			return ! _is_placeholder($arg);
127			});
128			return count($args) >= _number_of_required_params($callable);
129			}
130
131			/**
132			* @internal
133			* @param $callable
134			* @return int
135			*/
136			function _number_of_required_params($callable)
137			{
138			if (is_array($callable)) {
139			$refl = new \ReflectionClass($callable[0]);
140			$method = $refl->getMethod($callable[1]);
141			return $method->getNumberOfRequiredParameters();
142			}
143			$refl = new \ReflectionFunction($callable);
144			return $refl->getNumberOfRequiredParameters();
145			}
146
147			/**
148			* if the callback is an array(instance, method),
149			* it returns an equivalent function for PHP 5.3 compatibility.
150			*
151			* @internal
152			* @param callable $callable
153			* @return callable
154			*/
155			function _make_function($callable)
156			{
157			if (is_array($callable))
158			return function() use($callable) {
159			return call_user_func_array($callable, func_get_args());
160			};
161			return $callable;
162			}
163
164			/**
165			* Checks if an argument is a placeholder.
166			*
167			* @internal
168			* @param mixed $arg
169			* @return boolean
170			*/
171			function _is_placeholder($arg)
172			{
173			return $arg instanceof Placeholder;
174			}
175
176			/**
177			* Gets an array of placeholders positions in the given arguments.
178			*
179			* @internal
180			* @param array $args
181			* @return array
182			*/
183			function _placeholder_positions($args)
184			{
185			return array_keys(array_filter($args, 'Cypress\\Curry\\_is_placeholder'));
186			}
187
188			/**
189			* Get the last element in an array.
190			*
191			* @internal
192			* @param array $array
193			* @return mixed
194			*/
195			function _last($array)
196			{
197			return $array[count($array) - 1];
198			}
199
200			/**
201			* Gets a special placeholder value used to specify "gaps" within curried
202			* functions, allowing partial application of any combination of arguments,
203			* regardless of their positions. Should be used only for required arguments.
204			* When used, optional arguments must be at the end of the arguments list.
205			*
206			* @return Cypress\Curry\Placeholder
207			*/
208			function __()
209			{
210			return Placeholder::get();
211			}
212

matteosister / php-curry

Pull Request — master (#8)

functions.php ➔ curry_right() A

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