_functions.php ➔ _curry_n() - Code Metrics - Inspection of "Rewritten most of the functions to made them more..." - tarsana/functional - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#3)

by Amine

created 2017-01-05 14:48 UTC

_functions.php ➔ _curry_n() B

↳ Parent: Project

Complexity

Conditions	5
Paths	1

Size

Total Lines	23
Code Lines	17

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	5
eloc	17
nc	1
nop	3
dl	0
loc	23
rs	8.5906
c	0
b	0
f	0

<?php namespace Tarsana\Functional;
/**
 * This file contains common internal functions.
 * Caution: Code written here may seems stupid because it
 * contains a lot of duplications and low level optimisation,
 * but this is needed to make the library as efficient as possible.
 * @file
 */

/**
 * Adds the `Tarsana\Functional` namespace to a function name.
 * This is useful to pass non-curried functions as parameter.
 * ```php
 * F\_f('foo'); //=> 'Tarsana\Functional\foo'
 * ```
 *
 * @signature String -> Sring
 * @param  string $name
 * @return string
 */
function _f($name) {
    $name = "Tarsana\\Functional\\{$name}";
    return $name;
}

/**
 * Gets the number of arguments of a function.
 * ```php
 * F\_number_of_args(function($x, $y){}); //=> 2
 * ```
 *
 * @signature (* -> *) -> Number
 * @param  callable $fn
 * @return int
 */
function _number_of_args($fn) {
    $reflector = is_array($fn) ?
        new \ReflectionMethod($fn[0], $fn[1]) :
        new \ReflectionFunction($fn);
    return $reflector->getNumberOfRequiredParameters();
}

/**
 * Non curried version of apply for internal use.
 *
 * ```php
 * $sum = function() {
 *     return F\sum(func_get_args());
 * };
 * F\_apply($sum, [1, 2, 3, 4, 5]); //=> 15
 * F\_apply($sum, [1, 2, 3, 4, 5, 6]); //=> 21
 * ```
 *
 * @param  callable $fn
 * @param  array    $args
 * @return mixed
 */
function _apply($fn, $args) {
    switch (count($args)) {
        case 0: return $fn();
switch ($expr) {
case "A":
    doSomething(); //right
    break;
case "B":

    doSomethingElse(); //wrong
    break;
        case 1: return $fn($args[0]);
switch ($expr) {
case "A":
    doSomething(); //right
    break;
case "B":

    doSomethingElse(); //wrong
    break;
        case 2: return $fn($args[0], $args[1]);
switch ($expr) {
case "A":
    doSomething(); //right
    break;
case "B":

    doSomethingElse(); //wrong
    break;
        case 3: return $fn($args[0], $args[1], $args[2]);
switch ($expr) {
case "A":
    doSomething(); //right
    break;
case "B":

    doSomethingElse(); //wrong
    break;
        case 4: return $fn($args[0], $args[1], $args[2], $args[3]);
switch ($expr) {
case "A":
    doSomething(); //right
    break;
case "B":

    doSomethingElse(); //wrong
    break;
        case 5: return $fn($args[0], $args[1], $args[2], $args[3], $args[4]);
switch ($expr) {
case "A":
    doSomething(); //right
    break;
case "B":

    doSomethingElse(); //wrong
    break;
    }
    return call_user_func_array($fn, $args);
}

/**
 * Checks if `$a` is an argument placeholder.
 * ```php
 * F\_is_placeholder(F\__()); //=> true
 * F\_is_placeholder('other thing'); //=> false
 * ```
 *
 * @signature * -> Boolean
 * @param  mixed  $a
 * @return boolean
 */
function _is_placeholder($a) {
    return $a instanceof Placeholder;
}

/**
 * Curry an unary function.
 *
 * @ignore
 * @signature (a -> b) -> (a -> b)
 * @param  callable $fn
 * @return callable
 */
function _curry_one($fn) {
    return function() use($fn) {
        $args = func_get_args();
        return (count($args) > 0 && ! _is_placeholder($args[0]))
            ? $fn($args[0])
            : _curry_one($fn);
    };
}

/**
 * Curry an binary function.
 *
 * ```php
 * $add = _curry_two(function($x, $y) {
 *     return $x + $y;
 * });
 *
 * $addOne = $add(1, F\__());
 * $addOne(2); //=> 3
 * ```
 *
 * @ignore
 * @signature (a,b -> c) -> (a -> b -> c)
 * @param  callable $fn
 * @return callable
 */
function _curry_two($fn) {
    return function() use($fn) {
        $args = func_get_args();
        $n = count($args);
        while ($n > 0 && _is_placeholder($args[$n - 1]))
            $n --;
        if ($n == 0)
            return _curry_two($fn);
        if ($n == 1) {
            $a = &$args[0];
            if (_is_placeholder($a))
                return _curry_two($fn);
            return _curry_one(function($b) use($fn, &$a) {
                return $fn($a, $b);
            });
        }
        $a = &$args[0];
        $b = &$args[1];
        if (_is_placeholder($a) && _is_placeholder($b))
            return _curry_two($fn);
        if (_is_placeholder($a))
            return _curry_one(function($_a) use($fn, &$b) {
                return $fn($_a, $b);
            });
        return $fn($args[0], $args[1]);
    };
}

/**
 * Curry a function with 3 arguments.
 *
 * ```php
 * $add = _curry_three(function($x, $y, $z) {
 *     return $x + $y + $z;
 * });
 *
 * $add(1, 2, 3); //=> 6
 * $f = $add(F\__(), 2, F\__());
 * $f(1, 3); //=> 6
 * $g = $add(1, F\__(), 3);
 * $g(2); //=> 6
 * $h = $add(F\__(), F\__(), 3);
 * $h(1, 2); //=> 6
 * ```
 *
 * @ignore
 * @signature (a,b,c -> d) -> (a -> b -> c -> d)
 * @param  callable $fn
 * @return callable
 */
function _curry_three($fn) {
    return function() use($fn) {
        $args = func_get_args();
        $n = count($args);
        while ($n > 0 && _is_placeholder($args[$n - 1]))
            $n --;
        if ($n == 0)
            return _curry_three($fn);
        if ($n == 1) {
            $a = &$args[0];
            return _curry_two(function($b, $c) use($fn, &$a) {
                return $fn($a, $b, $c);
            });
        }
        if ($n == 2) {
            $a = &$args[0]; $b = &$args[1];

            if (_is_placeholder($a))
                return _curry_one(function($_a, $c) use(&$b) {
                    return $fn($_a, $b, $c);

                });
            return _curry_one(function($c) use($fn, &$a, &$b) {
                return $fn($a, $b, $c);
            });
        }

        $a = &$args[0]; $b = &$args[1]; $c = &$args[2];

        if (_is_placeholder($a) && _is_placeholder($b))

            return _cuury_two(function($_a, $_b) use(&$c) {
                return $fn($_a, $_b, $c);

            });
        if (_is_placeholder($a))

            return _cuury_one(function($_a) use(&$b, &$c) {
                return $fn($_a, $b, $c);

            });
        if (_is_placeholder($b))

            return _cuury_one(function($_b) use(&$a, &$c) {
                return $fn($a, $_b, $c);

            });

        return $fn($a, $b, $c);
    };
}

/**
 * Curry a function with `$n` arguments.
 *
 * ```php
 * $polynomial = F\_curry_n(function($a, $b, $c, $x) {
 *     return $a * $x * $x + $b * $x + $c;
 * }, 4);
 *
 * $linear = $polynomial(0);
 * $linear(2, 1, 5); //=> 11
 * ```
 *
 * @ignore
 * @signature (*... -> *) -> Number -> (* -> ... -> *)
 * @param  callable $fn
 * @param  int $n
 * @param  array $given
 * @return callable
 */
function _curry_n($fn, $n, $given = []) {
    return function() use($fn, $n, $given) {
        $args = func_get_args();
        $merged = _merge_args($given, $args, $n);
        $args = $merged->args;
        switch ($merged->placeholders) {
            case 0: return _apply($fn, $args);
switch ($expr) {
case "A":
    doSomething(); //right
    break;
case "B":

    doSomethingElse(); //wrong
    break;
            case 1:
                return _curry_one(function($a) use($fn, &$args) {
                    return _apply($fn, _fill_placeholders($args, [$a]));
                });
            case 2:
                return _curry_two(function($a, $b) use($fn, &$args) {
                    return _apply($fn, _fill_placeholders($args, [$a, $b]));
                });
            case 3:
                return _curry_three(function($a, $b, $c) use($fn, &$args) {
                    return _apply($fn, _fill_placeholders($args, [$a, $b, $c]));
                });
        }
        return _curry_n($fn, $n, $args);
    };
}

/**
 * Merges already given with new arguments, filling placeholders in the process.
 * Returns an object holding the resulting args and the number of placeholders left.
 *
 * ```php
 * $given = [F\__(), 2];
 * $args = [1, 3];
 * $newArgs = F\_merge_args($given, $args, 4);
 * $newArgs; //=> (object) ['args' => [1, 2, 3, F\__()], 'placeholders' => 1]
 * ```
 *
 * @param  array &$given
 * @param  array &$args
 * @param  int $n
 * @return object
 */
function _merge_args(&$given, &$args, $n) {
    $merged = (object) [
        'args' => [],
        'placeholders' => 0
    ];
    $givenIndex = 0; $argsIndex = 0; $mergedIndex = 0;
    $givenCount = count($given); $argsCount = count($args);
    while ($mergedIndex < $n && ($givenIndex < $givenCount || $argsIndex < $argsCount)) {
        if ($givenIndex < $givenCount && !_is_placeholder($given[$givenIndex])) {
            $merged->args[$mergedIndex] = $given[$givenIndex];
        } else if ($argsIndex < $argsCount) {
            $merged->args[$mergedIndex] = $args[$argsIndex];
            $argsIndex ++;
        } else {
            $merged->args[$mergedIndex] = $given[$givenIndex];
        }

        if (_is_placeholder($merged->args[$mergedIndex]))
            $merged->placeholders ++;

        $givenIndex ++;
        $mergedIndex ++;
    }
    while ($mergedIndex < $n) {
        $merged->args[$mergedIndex] = Placeholder::get();
        $mergedIndex ++;
        $merged->placeholders ++;
    }
    return $merged;
}

function _fill_placeholders($args, $fillers) {
    $argsIndex = 0; $fillersIndex = 0;
    $argsCount = count($args);
$myVar = 'Value';
$higher = false;

if (rand(1, 6) > 3) {
    $higher = true;
} else {
    $higher = false;
}
    $fillersCount = count($fillers);
    while ($fillersIndex < $fillersCount) {
        while (!_is_placeholder($args[$argsIndex]))
            $argsIndex ++;
        $args[$argsIndex] = $fillers[$fillersIndex];
        $fillersIndex ++;
    }
    return $args;
}


1		<?php namespace Tarsana\Functional;
2		/**
3		* This file contains common internal functions.
4		* Caution: Code written here may seems stupid because it
5		* contains a lot of duplications and low level optimisation,
6		* but this is needed to make the library as efficient as possible.
7		* @file
8		*/
9
10		/**
11		* Adds the `Tarsana\Functional` namespace to a function name.
12		* This is useful to pass non-curried functions as parameter.
13		* ```php
14		* F\_f('foo'); //=> 'Tarsana\Functional\foo'
15		* ```
16		*
17		* @signature String -> Sring
18		* @param string $name
19		* @return string
20		*/
21		function _f($name) {
22		$name = "Tarsana\\Functional\\{$name}";
23		return $name;
24		}
25
26		/**
27		* Gets the number of arguments of a function.
28		* ```php
29		* F\_number_of_args(function($x, $y){}); //=> 2
30		* ```
31		*
32		* @signature (* -> *) -> Number
33		* @param callable $fn
34		* @return int
35		*/
36		function _number_of_args($fn) {
37		$reflector = is_array($fn) ?
38		new \ReflectionMethod($fn[0], $fn[1]) :
39		new \ReflectionFunction($fn);
40		return $reflector->getNumberOfRequiredParameters();
41		}
42
43		/**
44		* Non curried version of apply for internal use.
45		*
46		* ```php
47		* $sum = function() {
48		* return F\sum(func_get_args());
49		* };
50		* F\_apply($sum, [1, 2, 3, 4, 5]); //=> 15
51		* F\_apply($sum, [1, 2, 3, 4, 5, 6]); //=> 21
52		* ```
53		*
54		* @param callable $fn
55		* @param array $args
56		* @return mixed
57		*/
58		function _apply($fn, $args) {
59		switch (count($args)) {
60		case 0: return $fn();
		0 ignored issues – show Coding Style introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report The case body in a switch statement must start on the line following the statement. According to the PSR-2, the body of a case statement must start on the line immediately following the case statement. switch ($expr) { case "A": doSomething(); //right break; case "B": doSomethingElse(); //wrong break; } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history... Coding Style introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report Terminating statement must be on a line by itself As per the PSR-2 coding standard, the `break` (or other terminating) statement must be on a line of its own. switch ($expr) { case "A": doSomething(); break; //wrong case "B": doSomething(); break; //right case "C:": doSomething(); return true; //right } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history...
61		case 1: return $fn($args[0]);
		0 ignored issues – show Coding Style introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report The case body in a switch statement must start on the line following the statement. According to the PSR-2, the body of a case statement must start on the line immediately following the case statement. switch ($expr) { case "A": doSomething(); //right break; case "B": doSomethingElse(); //wrong break; } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history... Coding Style introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report Terminating statement must be on a line by itself As per the PSR-2 coding standard, the `break` (or other terminating) statement must be on a line of its own. switch ($expr) { case "A": doSomething(); break; //wrong case "B": doSomething(); break; //right case "C:": doSomething(); return true; //right } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history...
62		case 2: return $fn($args[0], $args[1]);
		0 ignored issues – show Coding Style introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report The case body in a switch statement must start on the line following the statement. According to the PSR-2, the body of a case statement must start on the line immediately following the case statement. switch ($expr) { case "A": doSomething(); //right break; case "B": doSomethingElse(); //wrong break; } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history... Coding Style introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report Terminating statement must be on a line by itself As per the PSR-2 coding standard, the `break` (or other terminating) statement must be on a line of its own. switch ($expr) { case "A": doSomething(); break; //wrong case "B": doSomething(); break; //right case "C:": doSomething(); return true; //right } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history...
63		case 3: return $fn($args[0], $args[1], $args[2]);
		0 ignored issues – show Coding Style introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report The case body in a switch statement must start on the line following the statement. According to the PSR-2, the body of a case statement must start on the line immediately following the case statement. switch ($expr) { case "A": doSomething(); //right break; case "B": doSomethingElse(); //wrong break; } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history... Coding Style introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report Terminating statement must be on a line by itself As per the PSR-2 coding standard, the `break` (or other terminating) statement must be on a line of its own. switch ($expr) { case "A": doSomething(); break; //wrong case "B": doSomething(); break; //right case "C:": doSomething(); return true; //right } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history...
64	View Code Duplication	case 4: return $fn($args[0], $args[1], $args[2], $args[3]);
		0 ignored issues – show Duplication introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history... Coding Style introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report The case body in a switch statement must start on the line following the statement. According to the PSR-2, the body of a case statement must start on the line immediately following the case statement. switch ($expr) { case "A": doSomething(); //right break; case "B": doSomethingElse(); //wrong break; } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history... Coding Style introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report Terminating statement must be on a line by itself As per the PSR-2 coding standard, the `break` (or other terminating) statement must be on a line of its own. switch ($expr) { case "A": doSomething(); break; //wrong case "B": doSomething(); break; //right case "C:": doSomething(); return true; //right } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history...
65	View Code Duplication	case 5: return $fn($args[0], $args[1], $args[2], $args[3], $args[4]);
		0 ignored issues – show Duplication introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history... Coding Style introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report The case body in a switch statement must start on the line following the statement. According to the PSR-2, the body of a case statement must start on the line immediately following the case statement. switch ($expr) { case "A": doSomething(); //right break; case "B": doSomethingElse(); //wrong break; } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history... Coding Style introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report Terminating statement must be on a line by itself As per the PSR-2 coding standard, the `break` (or other terminating) statement must be on a line of its own. switch ($expr) { case "A": doSomething(); break; //wrong case "B": doSomething(); break; //right case "C:": doSomething(); return true; //right } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history...
66		}
67		return call_user_func_array($fn, $args);
68		}
69
70		/**
71		* Checks if `$a` is an argument placeholder.
72		* ```php
73		* F\_is_placeholder(F\__()); //=> true
74		* F\_is_placeholder('other thing'); //=> false
75		* ```
76		*
77		* @signature * -> Boolean
78		* @param mixed $a
79		* @return boolean
80		*/
81		function _is_placeholder($a) {
82		return $a instanceof Placeholder;
83		}
84
85		/**
86		* Curry an unary function.
87		*
88		* @ignore
89		* @signature (a -> b) -> (a -> b)
90		* @param callable $fn
91		* @return callable
92		*/
93		function _curry_one($fn) {
94		return function() use($fn) {
95		$args = func_get_args();
96		return (count($args) > 0 && ! _is_placeholder($args[0]))
97		? $fn($args[0])
98		: _curry_one($fn);
99		};
100		}
101
102		/**
103		* Curry an binary function.
104		*
105		* ```php
106		* $add = _curry_two(function($x, $y) {
107		* return $x + $y;
108		* });
109		*
110		* $addOne = $add(1, F\__());
111		* $addOne(2); //=> 3
112		* ```
113		*
114		* @ignore
115		* @signature (a,b -> c) -> (a -> b -> c)
116		* @param callable $fn
117		* @return callable
118		*/
119		function _curry_two($fn) {
120		return function() use($fn) {
121		$args = func_get_args();
122		$n = count($args);
123		while ($n > 0 && _is_placeholder($args[$n - 1]))
124		$n --;
125		if ($n == 0)
126		return _curry_two($fn);
127		if ($n == 1) {
128		$a = &$args[0];
129		if (_is_placeholder($a))
130		return _curry_two($fn);
131		return _curry_one(function($b) use($fn, &$a) {
132		return $fn($a, $b);
133		});
134		}
135		$a = &$args[0];
136		$b = &$args[1];
137		if (_is_placeholder($a) && _is_placeholder($b))
138		return _curry_two($fn);
139		if (_is_placeholder($a))
140		return _curry_one(function($_a) use($fn, &$b) {
141		return $fn($_a, $b);
142		});
143		return $fn($args[0], $args[1]);
144		};
145		}
146
147		/**
148		* Curry a function with 3 arguments.
149		*
150		* ```php
151		* $add = _curry_three(function($x, $y, $z) {
152		* return $x + $y + $z;
153		* });
154		*
155		* $add(1, 2, 3); //=> 6
156		* $f = $add(F\__(), 2, F\__());
157		* $f(1, 3); //=> 6
158		* $g = $add(1, F\__(), 3);
159		* $g(2); //=> 6
160		* $h = $add(F\__(), F\__(), 3);
161		* $h(1, 2); //=> 6
162		* ```
163		*
164		* @ignore
165		* @signature (a,b,c -> d) -> (a -> b -> c -> d)
166		* @param callable $fn
167		* @return callable
168		*/
169		function _curry_three($fn) {
170		return function() use($fn) {
171		$args = func_get_args();
172		$n = count($args);
173		while ($n > 0 && _is_placeholder($args[$n - 1]))
174		$n --;
175		if ($n == 0)
176		return _curry_three($fn);
177		if ($n == 1) {
178		$a = &$args[0];
179		return _curry_two(function($b, $c) use($fn, &$a) {
180		return $fn($a, $b, $c);
181		});
182		}
183		if ($n == 2) {
184		$a = &$args[0]; $b = &$args[1];
185
186		if (_is_placeholder($a))
187		return _curry_one(function($_a, $c) use(&$b) {
188		return $fn($_a, $b, $c);
		0 ignored issues – show Bug introduced 2017-01-05 14:50 UTC by Report Bug Copy Issue Report The variable `$fn` does not exist. Did you forget to declare it? This check marks access to variables or properties that have not been declared yet. While PHP has no explicit notion of declaring a variable, accessing it before a value is assigned to it is most likely a bug. Loading history...
189		});
190		return _curry_one(function($c) use($fn, &$a, &$b) {
191		return $fn($a, $b, $c);
192		});
193		}
194
195		$a = &$args[0]; $b = &$args[1]; $c = &$args[2];
196
197	View Code Duplication	if (_is_placeholder($a) && _is_placeholder($b))
		0 ignored issues – show Duplication introduced 2017-01-05 11:06 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...
198		return _cuury_two(function($_a, $_b) use(&$c) {
199		return $fn($_a, $_b, $c);
		0 ignored issues – show Bug introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report The variable `$fn` does not exist. Did you forget to declare it? This check marks access to variables or properties that have not been declared yet. While PHP has no explicit notion of declaring a variable, accessing it before a value is assigned to it is most likely a bug. Loading history...
200		});
201	View Code Duplication	if (_is_placeholder($a))
		0 ignored issues – show Duplication introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
202		return _cuury_one(function($_a) use(&$b, &$c) {
203		return $fn($_a, $b, $c);
		0 ignored issues – show Bug introduced 2017-01-05 14:50 UTC by Report Bug Copy Issue Report The variable `$fn` does not exist. Did you forget to declare it? This check marks access to variables or properties that have not been declared yet. While PHP has no explicit notion of declaring a variable, accessing it before a value is assigned to it is most likely a bug. Loading history...
204		});
205	View Code Duplication	if (_is_placeholder($b))
		0 ignored issues – show Duplication introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
206		return _cuury_one(function($_b) use(&$a, &$c) {
207		return $fn($a, $_b, $c);
		0 ignored issues – show Bug introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report The variable `$fn` does not exist. Did you forget to declare it? This check marks access to variables or properties that have not been declared yet. While PHP has no explicit notion of declaring a variable, accessing it before a value is assigned to it is most likely a bug. Loading history...
208		});
209
210		return $fn($a, $b, $c);
211		};
212		}
213
214		/**
215		* Curry a function with `$n` arguments.
216		*
217		* ```php
218		* $polynomial = F\_curry_n(function($a, $b, $c, $x) {
219		* return $a * $x * $x + $b * $x + $c;
220		* }, 4);
221		*
222		* $linear = $polynomial(0);
223		* $linear(2, 1, 5); //=> 11
224		* ```
225		*
226		* @ignore
227		* @signature (... -> ) -> Number -> (* -> ... -> *)
228		* @param callable $fn
229		* @param int $n
230		* @param array $given
231		* @return callable
232		*/
233		function _curry_n($fn, $n, $given = []) {
234		return function() use($fn, $n, $given) {
235		$args = func_get_args();
236		$merged = _merge_args($given, $args, $n);
237		$args = $merged->args;
238		switch ($merged->placeholders) {
239		case 0: return _apply($fn, $args);
		0 ignored issues – show Coding Style introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report The case body in a switch statement must start on the line following the statement. According to the PSR-2, the body of a case statement must start on the line immediately following the case statement. switch ($expr) { case "A": doSomething(); //right break; case "B": doSomethingElse(); //wrong break; } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history... Coding Style introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report Terminating statement must be on a line by itself As per the PSR-2 coding standard, the `break` (or other terminating) statement must be on a line of its own. switch ($expr) { case "A": doSomething(); break; //wrong case "B": doSomething(); break; //right case "C:": doSomething(); return true; //right } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history...
240		case 1:
241		return _curry_one(function($a) use($fn, &$args) {
242		return _apply($fn, _fill_placeholders($args, [$a]));
243		});
244		case 2:
245		return _curry_two(function($a, $b) use($fn, &$args) {
246		return _apply($fn, _fill_placeholders($args, [$a, $b]));
247		});
248		case 3:
249		return _curry_three(function($a, $b, $c) use($fn, &$args) {
250		return _apply($fn, _fill_placeholders($args, [$a, $b, $c]));
251		});
252		}
253		return _curry_n($fn, $n, $args);
254		};
255		}
256
257		/**
258		* Merges already given with new arguments, filling placeholders in the process.
259		* Returns an object holding the resulting args and the number of placeholders left.
260		*
261		* ```php
262		* $given = [F\__(), 2];
263		* $args = [1, 3];
264		* $newArgs = F\_merge_args($given, $args, 4);
265		* $newArgs; //=> (object) ['args' => [1, 2, 3, F\__()], 'placeholders' => 1]
266		* ```
267		*
268		* @param array &$given
269		* @param array &$args
270		* @param int $n
271		* @return object
272		*/
273		function _merge_args(&$given, &$args, $n) {
274		$merged = (object) [
275		'args' => [],
276		'placeholders' => 0
277		];
278		$givenIndex = 0; $argsIndex = 0; $mergedIndex = 0;
279		$givenCount = count($given); $argsCount = count($args);
280		while ($mergedIndex < $n && ($givenIndex < $givenCount \|\| $argsIndex < $argsCount)) {
281		if ($givenIndex < $givenCount && !_is_placeholder($given[$givenIndex])) {
282		$merged->args[$mergedIndex] = $given[$givenIndex];
283		} else if ($argsIndex < $argsCount) {
284		$merged->args[$mergedIndex] = $args[$argsIndex];
285		$argsIndex ++;
286		} else {
287		$merged->args[$mergedIndex] = $given[$givenIndex];
288		}
289
290		if (_is_placeholder($merged->args[$mergedIndex]))
291		$merged->placeholders ++;
292
293		$givenIndex ++;
294		$mergedIndex ++;
295		}
296		while ($mergedIndex < $n) {
297		$merged->args[$mergedIndex] = Placeholder::get();
298		$mergedIndex ++;
299		$merged->placeholders ++;
300		}
301		return $merged;
302		}
303
304		function _fill_placeholders($args, $fillers) {
305		$argsIndex = 0; $fillersIndex = 0;
306		$argsCount = count($args);
		0 ignored issues – show Unused Code introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report `$argsCount` is not used, you could remove the assignment. This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently. $myVar = 'Value'; $higher = false; if (rand(1, 6) > 3) { $higher = true; } else { $higher = false; } Both the `$myVar` assignment in line 1 and the `$higher` assignment in line 2 are dead. The first because `$myVar` is never used and the second because `$higher` is always overwritten for every possible time line. Loading history...
307		$fillersCount = count($fillers);
308		while ($fillersIndex < $fillersCount) {
309		while (!_is_placeholder($args[$argsIndex]))
310		$argsIndex ++;
311		$args[$argsIndex] = $fillers[$fillersIndex];
312		$fillersIndex ++;
313		}
314		return $args;
315		}
316

tarsana / functional

Pull Request — master (#3)

_functions.php ➔ _curry_n() B

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