Indentation::change() - Code Metrics - Inspection of "Initial commit" - colinodell/indentation - Measure and Improve Code Quality continuously with Scrutinizer

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by Colin

created 2022-03-16 21:16 UTC

Indentation::change() B

↳ Parent: Indentation

Complexity

Conditions	7
Paths	6

Size

Total Lines	31
Code Lines	17

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	7
eloc	17
c	1
b	0
f	0
nc	6
nop	2
dl	0
loc	31
rs	8.8333

<?php

declare(strict_types=1);

namespace ColinODell\Indentation;

final class Indentation
{
    public const TYPE_SPACE   = 'space';
    public const TYPE_TAB     = 'tab';
    public const TYPE_UNKNOWN = 'unknown';

    public int $amount;

    /** @var self::TYPE_* */
    public string $type;

    /**
     * @param self::TYPE_* $type
     */
    public function __construct(int $amount, string $type)
    {
        $this->amount = $amount;
        $this->type   = $type;

    }

    public function __toString(): string
    {
        if ($this->amount === 0 || $this->type === self::TYPE_UNKNOWN) {
            return '';
        }

        $indentCharacter = $this->type === self::TYPE_SPACE ? ' ' : "\t";

        return \str_repeat($indentCharacter, $this->amount);
    }

    /**
     * Detect the indentation of the given string.
     */
    public static function detect(string $string): Indentation
    {
        // Identify indents while skipping single space indents to avoid common edge cases (e.g. code comments)
        $indents = self::makeIndentsMap($string, true);
        // If no indents are identified, run again and include all indents for comprehensive detection
        if (\count($indents) === 0) {
            $indents = self::makeIndentsMap($string, false);
        }

        $keyOfMostUsedIndent = self::getMostUsedKey($indents);
        if ($keyOfMostUsedIndent === null) {
            return new self(0, self::TYPE_UNKNOWN);
        }

        [$amount, $type] = self::decodeIndentsKey($keyOfMostUsedIndent);

        return new self($amount, $type);
    }

    public static function change(string $string, Indentation $newStyle): string
    {
        $oldStyle = self::detect($string);

        if ($oldStyle->type === self::TYPE_UNKNOWN || $oldStyle->amount === 0) {
            return $string;
        }

        $lines = \preg_split('/(\R)/', $string, flags: \PREG_SPLIT_DELIM_CAPTURE);
        if ($lines === false) {
            throw new \InvalidArgumentException('Bad input string');
        }

        $newContent = '';
        foreach ($lines as $i => $line) {
            // Newline characters are in the odd-numbered positions
            if ($i % 2 === 1) {
                $newContent .= $line;
                continue;
            }

            if (\preg_match('/^(?:' . \preg_quote($oldStyle->__toString(), '/') . ')+/', $line, $matches) !== 1) {
                $newContent .= $line;
                continue;
            }

            $indentLevel = (int) (\strlen($matches[0]) / $oldStyle->amount);
            $newContent .= \str_repeat($newStyle->__toString(), $indentLevel) . \substr($line, $indentLevel * $oldStyle->amount);
        }

        return $newContent;
    }

    /**
     * @return array<string, array{0: int, 1: int}>
     */
    private static function makeIndentsMap(string $string, bool $ignoreSingleSpaces): array
    {
        $indents = [];

        // Remember the size of previous line's indentation
        $previousSize       = 0;
        $previousIndentType = null;

        // Indents key (ident type + size of the indents/unindents)
        $key = null;

        $lines = \preg_split('/\R/', $string);
        if ($lines === false) {
            throw new \InvalidArgumentException('Invalid string');
        }

        foreach ($lines as $line) {
            if ($line === '') {
                // Ignore empty lines
                continue;
            }

            // Detect either spaces or tabs but not both to properly handle tabs for indentation and spaces for alignment
            if (\preg_match('/^(?:( )+|\t+)/', $line, $matches) !== 1) {
                $previousSize       = 0;
                $previousIndentType = '';
                continue;
            }

            $indent     = \strlen($matches[0]);
            $indentType = isset($matches[1]) ? self::TYPE_SPACE : self::TYPE_TAB;
            // Ignore single space unless it's the only indent detected to prevent common false positives
            if ($ignoreSingleSpaces && $indentType === self::TYPE_SPACE && $indent === 1) {
                continue;
            }

            if ($indentType !== $previousIndentType) {
                $previousSize = 0;
            }

            $previousIndentType = $indentType;
            $weight             = 0;
            $indentDifference   = $indent - $previousSize;
            $previousSize       = $indent;

            // Previous line have same indent?
            if ($indentDifference === 0) {
                $weight++;
                // We use the key from previous loop
                \assert(isset($key) && \is_string($key));
            } else {
                $key = self::encodeIndentsKey($indentType, $indentDifference > 0 ? $indentDifference : -$indentDifference);
            }

            // Update the stats
            if (! isset($indents[$key])) {
                $indents[$key] = [1, 0];
            } else {
                $indents[$key][0]++;
                $indents[$key][1] += $weight;
            }
        }

        return $indents;
    }

    /**
     * Encode the indent type and amount as a string (e.g. 's4') for use as a compound key in the indents map.
     */
    private static function encodeIndentsKey(string $indentType, int $indentAmount): string
    {
        $typeCharacter = $indentType === self::TYPE_SPACE ? 's' : 't';

        return $typeCharacter . $indentAmount;
    }

    /**
     * Extract the indent type and amount from a key of the indents map.
     *
     * @return array{0: int, 1: self::TYPE_*}

     */
    private static function decodeIndentsKey(string $indentsKey): array
    {
        $keyHasTypeSpace = $indentsKey[0] === 's';
        $type            = $keyHasTypeSpace ? self::TYPE_SPACE : self::TYPE_TAB;

        $amount = \intval(\substr($indentsKey, 1));

        return [$amount, $type];
    }

    /**
     * Return the key (e.g. 's4') from the indents map that represents the most common indent,
     * or return undefined if there are no indents.
     *
     * @param array<string, array{int, int}> $indents

     */
    private static function getMostUsedKey(array $indents): string|null
    {
        $result    = null;
        $maxUsed   = 0;
        $maxWeight = 0;

        foreach ($indents as $key => [$usedCount, $weight]) {
            if ($usedCount <= $maxUsed && ($usedCount !== $maxUsed || $weight <= $maxWeight)) {
                continue;
            }

            $maxUsed   = $usedCount;
            $maxWeight = $weight;
            $result    = $key;
        }

        return $result;
    }
}


1			<?php
2
3			declare(strict_types=1);
4
5			namespace ColinODell\Indentation;
6
7			final class Indentation
8			{
9			public const TYPE_SPACE = 'space';
10			public const TYPE_TAB = 'tab';
11			public const TYPE_UNKNOWN = 'unknown';
12
13			public int $amount;
14
15			/** @var self::TYPE_* */
16			public string $type;
17
18			/**
19			* @param self::TYPE_* $type
20			*/
21			public function __construct(int $amount, string $type)
22			{
23			$this->amount = $amount;
24			$this->type = $type;
			1 ignored issue – show Documentation Bug introduced 2022-03-16 21:29 UTC by Report Bug Copy Issue Report It seems like `$type` of type `string` is incompatible with the declared type `ColinODell\Indentation\Indentation` of property `$type`. Our type inference engine has found an assignment to a property that is incompatible with the declared type of that property. Either this assignment is in error or the assigned type should be added to the documentation/type hint for that property.. Loading history...
25			}
26
27			public function __toString(): string
28			{
29			if ($this->amount === 0 \|\| $this->type === self::TYPE_UNKNOWN) {
30			return '';
31			}
32
33			$indentCharacter = $this->type === self::TYPE_SPACE ? ' ' : "\t";
34
35			return \str_repeat($indentCharacter, $this->amount);
36			}
37
38			/**
39			* Detect the indentation of the given string.
40			*/
41			public static function detect(string $string): Indentation
42			{
43			// Identify indents while skipping single space indents to avoid common edge cases (e.g. code comments)
44			$indents = self::makeIndentsMap($string, true);
45			// If no indents are identified, run again and include all indents for comprehensive detection
46			if (\count($indents) === 0) {
47			$indents = self::makeIndentsMap($string, false);
48			}
49
50			$keyOfMostUsedIndent = self::getMostUsedKey($indents);
51			if ($keyOfMostUsedIndent === null) {
52			return new self(0, self::TYPE_UNKNOWN);
53			}
54
55			[$amount, $type] = self::decodeIndentsKey($keyOfMostUsedIndent);
56
57			return new self($amount, $type);
58			}
59
60			public static function change(string $string, Indentation $newStyle): string
61			{
62			$oldStyle = self::detect($string);
63
64			if ($oldStyle->type === self::TYPE_UNKNOWN \|\| $oldStyle->amount === 0) {
65			return $string;
66			}
67
68			$lines = \preg_split('/(\R)/', $string, flags: \PREG_SPLIT_DELIM_CAPTURE);
69			if ($lines === false) {
70			throw new \InvalidArgumentException('Bad input string');
71			}
72
73			$newContent = '';
74			foreach ($lines as $i => $line) {
75			// Newline characters are in the odd-numbered positions
76			if ($i % 2 === 1) {
77			$newContent .= $line;
78			continue;
79			}
80
81			if (\preg_match('/^(?:' . \preg_quote($oldStyle->__toString(), '/') . ')+/', $line, $matches) !== 1) {
82			$newContent .= $line;
83			continue;
84			}
85
86			$indentLevel = (int) (\strlen($matches[0]) / $oldStyle->amount);
87			$newContent .= \str_repeat($newStyle->__toString(), $indentLevel) . \substr($line, $indentLevel * $oldStyle->amount);
88			}
89
90			return $newContent;
91			}
92
93			/**
94			* @return array<string, array{0: int, 1: int}>
95			*/
96			private static function makeIndentsMap(string $string, bool $ignoreSingleSpaces): array
97			{
98			$indents = [];
99
100			// Remember the size of previous line's indentation
101			$previousSize = 0;
102			$previousIndentType = null;
103
104			// Indents key (ident type + size of the indents/unindents)
105			$key = null;
106
107			$lines = \preg_split('/\R/', $string);
108			if ($lines === false) {
109			throw new \InvalidArgumentException('Invalid string');
110			}
111
112			foreach ($lines as $line) {
113			if ($line === '') {
114			// Ignore empty lines
115			continue;
116			}
117
118			// Detect either spaces or tabs but not both to properly handle tabs for indentation and spaces for alignment
119			if (\preg_match('/^(?:( )+\|\t+)/', $line, $matches) !== 1) {
120			$previousSize = 0;
121			$previousIndentType = '';
122			continue;
123			}
124
125			$indent = \strlen($matches[0]);
126			$indentType = isset($matches[1]) ? self::TYPE_SPACE : self::TYPE_TAB;
127			// Ignore single space unless it's the only indent detected to prevent common false positives
128			if ($ignoreSingleSpaces && $indentType === self::TYPE_SPACE && $indent === 1) {
129			continue;
130			}
131
132			if ($indentType !== $previousIndentType) {
133			$previousSize = 0;
134			}
135
136			$previousIndentType = $indentType;
137			$weight = 0;
138			$indentDifference = $indent - $previousSize;
139			$previousSize = $indent;
140
141			// Previous line have same indent?
142			if ($indentDifference === 0) {
143			$weight++;
144			// We use the key from previous loop
145			\assert(isset($key) && \is_string($key));
146			} else {
147			$key = self::encodeIndentsKey($indentType, $indentDifference > 0 ? $indentDifference : -$indentDifference);
148			}
149
150			// Update the stats
151			if (! isset($indents[$key])) {
152			$indents[$key] = [1, 0];
153			} else {
154			$indents[$key][0]++;
155			$indents[$key][1] += $weight;
156			}
157			}
158
159			return $indents;
160			}
161
162			/**
163			* Encode the indent type and amount as a string (e.g. 's4') for use as a compound key in the indents map.
164			*/
165			private static function encodeIndentsKey(string $indentType, int $indentAmount): string
166			{
167			$typeCharacter = $indentType === self::TYPE_SPACE ? 's' : 't';
168
169			return $typeCharacter . $indentAmount;
170			}
171
172			/**
173			* Extract the indent type and amount from a key of the indents map.
174			*
175			* @return array{0: int, 1: self::TYPE_*}
			1 ignored issue – show Documentation Bug introduced 2022-03-16 21:29 UTC by Report Bug Copy Issue Report The doc comment `array{0: int, 1: self::TYPE_*}` at position `8` could not be parsed: Expected '}' at position 8, but found 'self'. Loading history...
176			*/
177			private static function decodeIndentsKey(string $indentsKey): array
178			{
179			$keyHasTypeSpace = $indentsKey[0] === 's';
180			$type = $keyHasTypeSpace ? self::TYPE_SPACE : self::TYPE_TAB;
181
182			$amount = \intval(\substr($indentsKey, 1));
183
184			return [$amount, $type];
185			}
186
187			/**
188			* Return the key (e.g. 's4') from the indents map that represents the most common indent,
189			* or return undefined if there are no indents.
190			*
191			* @param array<string, array{int, int}> $indents
			1 ignored issue – show Documentation Bug introduced 2022-03-16 21:29 UTC by Report Bug Copy Issue Report The doc comment `array<string, array{int, int}>` at position `6` could not be parsed: Expected ':' at position 6, but found 'int'. Loading history...
192			*/
193			private static function getMostUsedKey(array $indents): string\|null
194			{
195			$result = null;
196			$maxUsed = 0;
197			$maxWeight = 0;
198
199			foreach ($indents as $key => [$usedCount, $weight]) {
200			if ($usedCount <= $maxUsed && ($usedCount !== $maxUsed \|\| $weight <= $maxWeight)) {
201			continue;
202			}
203
204			$maxUsed = $usedCount;
205			$maxWeight = $weight;
206			$result = $key;
207			}
208
209			return $result;
210			}
211			}
212

colinodell / indentation

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Indentation::change() B

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