InlineGrammar::parseGrammar() - Code Metrics - Inspection of "Remove unused dev-autoload namespace" - spiral/framework - Measure and Improve Code Quality continuously with Scrutinizer

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by Kirill

created 2020-09-18 20:12 UTC

InlineGrammar::parseGrammar() C

↳ Parent: InlineGrammar

Complexity

Conditions	15
Paths	8

Size

Total Lines	80
Code Lines	46

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	15
eloc	46
c	1
b	0
f	0
nc	8
nop	2
dl	0
loc	80
rs	5.9166

How to fix Long Method Complexity

<?php

/**
 * Spiral Framework.
 *
 * @license   MIT
 * @author    Anton Titov (Wolfy-J)
 */

declare(strict_types=1);

namespace Spiral\Stempler\Lexer\Grammar;

use Spiral\Stempler\Lexer\Buffer;
use Spiral\Stempler\Lexer\Byte;
use Spiral\Stempler\Lexer\Grammar\Traits\TokenTrait;
use Spiral\Stempler\Lexer\GrammarInterface;
use Spiral\Stempler\Lexer\Token;

/**
 * Handle block inline injects ${name|default}, to be used in combination with HTML grammar.
 */
final class InlineGrammar implements GrammarInterface
{
    use TokenTrait;


    // inject grammar tokens
    public const TYPE_OPEN_TAG  = 1;
    public const TYPE_CLOSE_TAG = 2;
    public const TYPE_NAME      = 3;
    public const TYPE_SEPARATOR = 4;
    public const TYPE_DEFAULT   = 5;

    // whitespace
    private const REGEXP_WHITESPACE = '/\s/';

    // Allowed keyword characters.
    private const REGEXP_KEYWORD = '/[a-z0-9_\-:\.]/ui';

    /** @var Byte[] */
    private $name = [];

    /** @var Byte[]|null */
    private $default = null;

    /**
     * @inheritDoc
     */
    public function parse(Buffer $src): \Generator
    {
        while ($n = $src->next()) {
            if (!$n instanceof Byte || $n->char !== '$' || $src->lookaheadByte() !== '{') {
                yield $n;
                continue;
            }

            $binding = (clone $this)->parseGrammar($src, $n->offset);
            if ($binding === null) {
                yield $n;
                $src->replay($n->offset);
                continue;
            }

            yield from $binding;
        }
    }

    /**
     * @codeCoverageIgnore
     * @inheritDoc
     */
    public static function tokenName(int $token): string
    {
        switch ($token) {
            case self::TYPE_OPEN_TAG:
                return 'INLINE:OPEN_TAG';
            case self::TYPE_CLOSE_TAG:
                return 'INLINE:CLOSE_TAG';
            case self::TYPE_NAME:
                return 'INLINE:NAME';
            case self::TYPE_SEPARATOR:
                return 'INLINE:SEPARATOR';
            case self::TYPE_DEFAULT:
                return 'INLINE:DEFAULT';
            default:
                return 'INLINE:UNDEFINED';
        }
    }

    /**
     * @param Buffer $src
     * @param int    $offset
     * @return Token[]|null
     */
    private function parseGrammar(Buffer $src, int $offset): ?array
    {
        $this->tokens = [
            new Token(self::TYPE_OPEN_TAG, $offset, '$' . $src->next()->char)

        ];

        while ($n = $src->next()) {
            if (!$n instanceof Byte) {
                // no other grammars are allowed
                return null;
            }

            switch ($n->char) {
                case '"':
                case "'":
                    if ($this->default === null) {
                        // " and ' not allowed in names
                        return null;
                    }

                    $this->default[] = $n;
                    while ($nn = $src->next()) {
                        $this->default[] = $nn;
                        if ($nn instanceof Byte && $nn->char === $n->char) {
                            break;
                        }
                    }
                    break;

                case '}':
                    $this->flushName();
                    $this->flushDefault();

                    $this->tokens[] = new Token(
                        self::TYPE_CLOSE_TAG,
                        $n->offset,
                        $n->char
                    );

                    break 2;

                case '|':
                    $this->flushName();
                    $this->flushDefault();

                    $this->tokens[] = new Token(
                        self::TYPE_SEPARATOR,
                        $n->offset,
                        $n->char
                    );

                    $this->default = [];

                    break;

                default:
                    if ($this->default !== null) {
                        // default allows spaces
                        $this->default[] = $n;
                        break;
                    }

                    if (preg_match(self::REGEXP_WHITESPACE, $n->char)) {
                        break;
                    }

                    if (preg_match(self::REGEXP_KEYWORD, $n->char)) {
                        $this->name[] = $n;
                        break;
                    }

                    return null;
            }
        }

        if (!$this->isValid()) {
            return null;
        }

        return $this->tokens;
    }

    /**
     * @return bool
     */
    private function isValid(): bool
    {
        if (count($this->tokens) < 3) {
            return false;
        }

        $hasName = false;
        $hasDefault = null;
        foreach ($this->tokens as $token) {
            if ($token->type === self::TYPE_NAME) {
                $hasName = true;
                continue;
            }

            if ($token->type === self::TYPE_SEPARATOR && $hasDefault === null) {
                $hasDefault = false;
                continue;
            }

            if ($token->type === self::TYPE_DEFAULT) {
                if ($hasDefault === true) {
                    // multiple default value
                    return false;
                }

                $hasDefault = true;
            }
        }

        return $hasName && ($hasDefault === null || $hasDefault === true);
    }

    /**
     * Pack name token.
     */
    private function flushName(): void
    {
        if ($this->name === []) {
            return;
        }

        $this->tokens[] = $this->packToken($this->name, self::TYPE_NAME);
        $this->name = [];
    }

    /**
     * Pack default token.
     */
    private function flushDefault(): void
    {
        if ($this->default === [] || $this->default === null) {
            return;
        }

        $this->tokens[] = $this->packToken($this->default, self::TYPE_DEFAULT);
        $this->default = [];
    }
}


1			<?php
2
3			/**
4			* Spiral Framework.
5			*
6			* @license MIT
7			* @author Anton Titov (Wolfy-J)
8			*/
9
10			declare(strict_types=1);
11
12			namespace Spiral\Stempler\Lexer\Grammar;
13
14			use Spiral\Stempler\Lexer\Buffer;
15			use Spiral\Stempler\Lexer\Byte;
16			use Spiral\Stempler\Lexer\Grammar\Traits\TokenTrait;
17			use Spiral\Stempler\Lexer\GrammarInterface;
18			use Spiral\Stempler\Lexer\Token;
19
20			/**
21			* Handle block inline injects ${name\|default}, to be used in combination with HTML grammar.
22			*/
23			final class InlineGrammar implements GrammarInterface
24			{
25			use TokenTrait;
			0 ignored issues – show introduced 2020-09-18 20:16 UTC by Report Bug Copy Issue Report The trait `Spiral\Stempler\Lexer\Grammar\Traits\TokenTrait` requires some properties which are not provided by `Spiral\Stempler\Lexer\Grammar\InlineGrammar`: `$char`, `$content`, `$type` Loading history...
26
27			// inject grammar tokens
28			public const TYPE_OPEN_TAG = 1;
29			public const TYPE_CLOSE_TAG = 2;
30			public const TYPE_NAME = 3;
31			public const TYPE_SEPARATOR = 4;
32			public const TYPE_DEFAULT = 5;
33
34			// whitespace
35			private const REGEXP_WHITESPACE = '/\s/';
36
37			// Allowed keyword characters.
38			private const REGEXP_KEYWORD = '/[a-z0-9_\-:\.]/ui';
39
40			/** @var Byte[] */
41			private $name = [];
42
43			/** @var Byte[]\|null */
44			private $default = null;
45
46			/**
47			* @inheritDoc
48			*/
49			public function parse(Buffer $src): \Generator
50			{
51			while ($n = $src->next()) {
52			if (!$n instanceof Byte \|\| $n->char !== '$' \|\| $src->lookaheadByte() !== '{') {
53			yield $n;
54			continue;
55			}
56
57			$binding = (clone $this)->parseGrammar($src, $n->offset);
58			if ($binding === null) {
59			yield $n;
60			$src->replay($n->offset);
61			continue;
62			}
63
64			yield from $binding;
65			}
66			}
67
68			/**
69			* @codeCoverageIgnore
70			* @inheritDoc
71			*/
72			public static function tokenName(int $token): string
73			{
74			switch ($token) {
75			case self::TYPE_OPEN_TAG:
76			return 'INLINE:OPEN_TAG';
77			case self::TYPE_CLOSE_TAG:
78			return 'INLINE:CLOSE_TAG';
79			case self::TYPE_NAME:
80			return 'INLINE:NAME';
81			case self::TYPE_SEPARATOR:
82			return 'INLINE:SEPARATOR';
83			case self::TYPE_DEFAULT:
84			return 'INLINE:DEFAULT';
85			default:
86			return 'INLINE:UNDEFINED';
87			}
88			}
89
90			/**
91			* @param Buffer $src
92			* @param int $offset
93			* @return Token[]\|null
94			*/
95			private function parseGrammar(Buffer $src, int $offset): ?array
96			{
97			$this->tokens = [
98			new Token(self::TYPE_OPEN_TAG, $offset, '$' . $src->next()->char)
			0 ignored issues – show Bug introduced 2020-09-18 20:16 UTC by Report Bug Copy Issue Report The property `char` does not seem to exist on `Spiral\Stempler\Lexer\Token`. Loading history...
99			];
100
101			while ($n = $src->next()) {
102			if (!$n instanceof Byte) {
103			// no other grammars are allowed
104			return null;
105			}
106
107			switch ($n->char) {
108			case '"':
109			case "'":
110			if ($this->default === null) {
111			// " and ' not allowed in names
112			return null;
113			}
114
115			$this->default[] = $n;
116			while ($nn = $src->next()) {
117			$this->default[] = $nn;
118			if ($nn instanceof Byte && $nn->char === $n->char) {
119			break;
120			}
121			}
122			break;
123
124			case '}':
125			$this->flushName();
126			$this->flushDefault();
127
128			$this->tokens[] = new Token(
129			self::TYPE_CLOSE_TAG,
130			$n->offset,
131			$n->char
132			);
133
134			break 2;
135
136			case '\|':
137			$this->flushName();
138			$this->flushDefault();
139
140			$this->tokens[] = new Token(
141			self::TYPE_SEPARATOR,
142			$n->offset,
143			$n->char
144			);
145
146			$this->default = [];
147
148			break;
149
150			default:
151			if ($this->default !== null) {
152			// default allows spaces
153			$this->default[] = $n;
154			break;
155			}
156
157			if (preg_match(self::REGEXP_WHITESPACE, $n->char)) {
158			break;
159			}
160
161			if (preg_match(self::REGEXP_KEYWORD, $n->char)) {
162			$this->name[] = $n;
163			break;
164			}
165
166			return null;
167			}
168			}
169
170			if (!$this->isValid()) {
171			return null;
172			}
173
174			return $this->tokens;
175			}
176
177			/**
178			* @return bool
179			*/
180			private function isValid(): bool
181			{
182			if (count($this->tokens) < 3) {
183			return false;
184			}
185
186			$hasName = false;
187			$hasDefault = null;
188			foreach ($this->tokens as $token) {
189			if ($token->type === self::TYPE_NAME) {
190			$hasName = true;
191			continue;
192			}
193
194			if ($token->type === self::TYPE_SEPARATOR && $hasDefault === null) {
195			$hasDefault = false;
196			continue;
197			}
198
199			if ($token->type === self::TYPE_DEFAULT) {
200			if ($hasDefault === true) {
201			// multiple default value
202			return false;
203			}
204
205			$hasDefault = true;
206			}
207			}
208
209			return $hasName && ($hasDefault === null \|\| $hasDefault === true);
210			}
211
212			/**
213			* Pack name token.
214			*/
215			private function flushName(): void
216			{
217			if ($this->name === []) {
218			return;
219			}
220
221			$this->tokens[] = $this->packToken($this->name, self::TYPE_NAME);
222			$this->name = [];
223			}
224
225			/**
226			* Pack default token.
227			*/
228			private function flushDefault(): void
229			{
230			if ($this->default === [] \|\| $this->default === null) {
231			return;
232			}
233
234			$this->tokens[] = $this->packToken($this->default, self::TYPE_DEFAULT);
235			$this->default = [];
236			}
237			}
238

spiral / framework

Push — master ( c776c7...570285 )

InlineGrammar::parseGrammar() C

Complexity

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Duplication

Importance

How to fix Long Method Complexity

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