Matcher::_parseCons() - Code Metrics - Inspection of "as rule" - functional-php/pattern-matching - Measure and Improve Code Quality continuously with Scrutinizer

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by Gilles

created 2016-10-24 11:55 UTC

Matcher::_parseCons() B

↳ Parent: Matcher

Complexity

Conditions	6
Paths	7

Size

Total Lines	28
Code Lines	15

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	6
eloc	15
nc	7
nop	2
dl	0
loc	28
rs	8.439
c	0
b	0
f	0

<?php

namespace PHPFunctional\PatternMatching;

class Matcher
{
    private static $rules = [
        '/^(true|false)$/i' => '_parseBooleanConstant',
        '/^([\'"])(?:(?!\\1).)*\\1$/' => '_parseStringConstant',
        '/^[a-zA-Z]+$/' => '_parseIdentifier',
        '/^_$/' => '_parseWildcard',
        '/^\\[.*\\]$/' => '_parseArray',
        '/^\\([^:]+:.+\\)$/' => '_parseCons',
        '/^[a-zA-Z]+@.+$/' => '_parseAs',
    ];

    private static function _parseBooleanConstant($value, $pattern)
    {
        return is_bool($value) ? [] : false;
    }

    private static function _parseStringConstant($value, $pattern)
    {
        $string_pattern = substr($pattern, 1, -1);
        return is_string($value) && $string_pattern == $value ? [] : false;
    }

    private static function _parseIdentifier($value, $pattern)
    {
        return [$value];
    }

    private static function _parseWildcard($value, $pattern)

    {
        return [];
    }

    private static function _parseArray($value, $pattern)
    {
        if(! is_array($value)) {
            return false;
        }

        $patterns = array_filter(array_map('trim', split_enclosed(',', '[', ']', substr($pattern, 1, -1))));

        if(count($patterns) === 0) {
            return count($value) === 0 ? [] : false;
        }

        if(count($patterns) > count($value)) {
            return false;
        }

        $index = 0;
        $results = [];
        foreach($value as $v) {
            $new = self::parse($v, $patterns[$index]);

            if($new === false) {
                return false;
            }

            $results = array_merge($results, $new);
            ++$index;
        }

        return $results;
    }

    private static function _parseCons($value, $pattern)
    {
        if(! is_array($value)) {
            return false;
        }

        $patterns = array_filter(array_map('trim', split_enclosed(':', '(', ')', substr($pattern, 1, -1))));
        $last = array_pop($patterns);

        $results = [];
        foreach($patterns as $p) {
            if(count($value) == 0) {
                return false;
            }

            $new = self::parse(array_shift($value), $p);

            if($new === false) {
                return false;
            }

            $results = array_merge($results, $new);
        }

        $new = self::parse($value, $last);

        return $new === false ? false : array_merge($results, $new);
    }

    private static function _parseAs($value, $pattern)
    {
        $patterns = explode('@', $pattern, 2);

        $rest = self::parse($value, $patterns[1]);
        return $rest === false ? false : array_merge([$value], $rest);
    }

    /**
     * @param mixed $value
     * @param string $pattern
     * @return bool|array
     */
    private static function parse($value, $pattern)
    {
        $pattern = trim($pattern);


        if(is_numeric($pattern) && is_numeric($value)) {
            return [];
        }

        foreach(self::$rules as $regex => $method) {
            if(preg_match($regex, $pattern)) {
                $arguments = call_user_func_array(['static', $method], [$value, $pattern]);

                if($arguments !== false) {
                    return $arguments;
                }
            }
        }

        return false;
    }

    /**
     * @param mixed $value
     * @param array $patterns
     * @return mixed
     */
    public static function match($value, array $patterns)
    {
        foreach($patterns as $pattern => $callback) {
            $match = self::parse($value, $pattern);

            if($match !== false) {
                return call_user_func_array($callback, $match);
            }
        }

        throw new \RuntimeException("Non-exhaustive patterns.");
<?php

$singleQuoted = 'Value';
$doubleQuoted = "\tSingle is $singleQuoted";

print $doubleQuoted;
    }
}

1			<?php
2
3			namespace PHPFunctional\PatternMatching;
4
5			class Matcher
6			{
7			private static $rules = [
8			'/^(true\|false)$/i' => '_parseBooleanConstant',
9			'/^([\'"])(?:(?!\\1).)*\\1$/' => '_parseStringConstant',
10			'/^[a-zA-Z]+$/' => '_parseIdentifier',
11			'/^_$/' => '_parseWildcard',
12			'/^\\[.*\\]$/' => '_parseArray',
13			'/^\\([^:]+:.+\\)$/' => '_parseCons',
14			'/^[a-zA-Z]+@.+$/' => '_parseAs',
15			];
16
17			private static function _parseBooleanConstant($value, $pattern)
18			{
19			return is_bool($value) ? [] : false;
20			}
21
22			private static function _parseStringConstant($value, $pattern)
23			{
24			$string_pattern = substr($pattern, 1, -1);
25			return is_string($value) && $string_pattern == $value ? [] : false;
26			}
27
28			private static function _parseIdentifier($value, $pattern)
29			{
30			return [$value];
31			}
32
33			private static function _parseWildcard($value, $pattern)
			1 ignored issue – show Unused Code introduced 2016-10-24 11:27 UTC by Report Bug Copy Issue Report The parameter `$value` 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...
34			{
35			return [];
36			}
37
38			private static function _parseArray($value, $pattern)
39			{
40			if(! is_array($value)) {
41			return false;
42			}
43
44			$patterns = array_filter(array_map('trim', split_enclosed(',', '[', ']', substr($pattern, 1, -1))));
45
46			if(count($patterns) === 0) {
47			return count($value) === 0 ? [] : false;
48			}
49
50			if(count($patterns) > count($value)) {
51			return false;
52			}
53
54			$index = 0;
55			$results = [];
56			foreach($value as $v) {
57			$new = self::parse($v, $patterns[$index]);
58
59			if($new === false) {
60			return false;
61			}
62
63			$results = array_merge($results, $new);
64			++$index;
65			}
66
67			return $results;
68			}
69
70			private static function _parseCons($value, $pattern)
71			{
72			if(! is_array($value)) {
73			return false;
74			}
75
76			$patterns = array_filter(array_map('trim', split_enclosed(':', '(', ')', substr($pattern, 1, -1))));
77			$last = array_pop($patterns);
78
79			$results = [];
80			foreach($patterns as $p) {
81			if(count($value) == 0) {
82			return false;
83			}
84
85			$new = self::parse(array_shift($value), $p);
86
87			if($new === false) {
88			return false;
89			}
90
91			$results = array_merge($results, $new);
92			}
93
94			$new = self::parse($value, $last);
95
96			return $new === false ? false : array_merge($results, $new);
97			}
98
99			private static function _parseAs($value, $pattern)
100			{
101			$patterns = explode('@', $pattern, 2);
102
103			$rest = self::parse($value, $patterns[1]);
104			return $rest === false ? false : array_merge([$value], $rest);
105			}
106
107			/**
108			* @param mixed $value
109			* @param string $pattern
110			* @return bool\|array
111			*/
112			private static function parse($value, $pattern)
113			{
114			$pattern = trim($pattern);
			1 ignored issue – show Coding Style introduced 2016-10-24 08:44 UTC by Report Bug Copy Issue Report Consider using a different name than the parameter `$pattern`. This often makes code more readable. Loading history...
115
116			if(is_numeric($pattern) && is_numeric($value)) {
117			return [];
118			}
119
120			foreach(self::$rules as $regex => $method) {
121			if(preg_match($regex, $pattern)) {
122			$arguments = call_user_func_array(['static', $method], [$value, $pattern]);
123
124			if($arguments !== false) {
125			return $arguments;
126			}
127			}
128			}
129
130			return false;
131			}
132
133			/**
134			* @param mixed $value
135			* @param array $patterns
136			* @return mixed
137			*/
138			public static function match($value, array $patterns)
139			{
140			foreach($patterns as $pattern => $callback) {
141			$match = self::parse($value, $pattern);
142
143			if($match !== false) {
144			return call_user_func_array($callback, $match);
145			}
146			}
147
148			throw new \RuntimeException("Non-exhaustive patterns.");
			0 ignored issues – show Coding Style Comprehensibility introduced 2016-10-22 13:48 UTC by Report Bug Copy Issue Report The string literal `Non-exhaustive patterns.` does not require double quotes, as per coding-style, please use single quotes. PHP provides two ways to mark string literals. Either with single quotes `'literal'` or with double quotes `"literal"`. The difference between these is that string literals in double quotes may contain variables with are evaluated at run-time as well as escape sequences. String literals in single quotes on the other hand are evaluated very literally and the only two characters that needs escaping in the literal are the single quote itself (`\'`) and the backslash (`\\`). Every other character is displayed as is. Double quoted string literals may contain other variables or more complex escape sequences. <?php $singleQuoted = 'Value'; $doubleQuoted = "\tSingle is $singleQuoted"; print $doubleQuoted; will print an indented: `Single is Value` If your string literal does not contain variables or escape sequences, it should be defined using single quotes to make that fact clear. For more information on PHP string literals and available escape sequences see the PHP core documentation. Loading history...
149			}
150			}

functional-php / pattern-matching

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Matcher::_parseCons() B

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