Frontend::extract() - Code Metrics - Inspection of "Basic frontend logic impl" - railt/sdl - Measure and Improve Code Quality continuously with Scrutinizer

Test Failed

Push — master ( 2d53c5...8b1ae1 )

by Kirill

created 2018-08-24 00:21 UTC

Frontend::extract() A

↳ Parent: Frontend

Complexity

Conditions	3
Paths	2

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	3
nc	2
nop	1
dl	0
loc	11
rs	9.9
c	0
b	0
f	0

<?php
/**
 * This file is part of Railt package.
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
declare(strict_types=1);

namespace Railt\SDL\Frontend;

use Psr\Log\LoggerAwareInterface;
use Psr\Log\LoggerAwareTrait;
use Railt\Io\Readable;
use Railt\Parser\Ast\NodeInterface;
use Railt\Parser\Ast\RuleInterface;
use Railt\Parser\Exception\UnexpectedTokenException;
use Railt\Parser\Exception\UnrecognizedTokenException;
use Railt\SDL\Exception\SyntaxException;
use Railt\SDL\Frontend\AST\ProvidesOpcode;
use Railt\SDL\Frontend\IR\Opcode;
use Railt\SDL\Frontend\IR\Opcode\OpenOpcode;
use Railt\SDL\Frontend\IR\OpcodeHeap;
use Railt\SDL\Frontend\IR\OpcodeInterface;

/**
 * Class Frontend
 */
class Frontend implements LoggerAwareInterface
{
    use LoggerAwareTrait;

    /**
     * @var Parser
     */
    private $parser;

    /**
     * @var OpcodeHeap
     */
    private $heap;

    /**
     * @var Context
     */
    private $context;

    /**
     * Frontend constructor.
     */
    public function __construct()
    {
        $this->parser = new Parser();
        $this->context = new Context();
        $this->heap = new OpcodeHeap($this->context);
    }

    /**
     * @param Readable $file
     * @return iterable|OpcodeInterface[]
     * @throws SyntaxException
     */
    public function load(Readable $file): iterable
    {
        $this->context->create();

        $this->heap->add(new OpenOpcode($file), $file);

        $iterator = $this->bypass($this->parse($file));

        while ($iterator->valid()) {
            [$ast, $opcode] = [$iterator->key(), $iterator->current()];
function someFunction() {
    $x = 5;
    echo $x;
}

            $iterator->send($this->heap->add($opcode, $file, $ast->getOffset()));
function someFunction() {
    $x = 5;
    echo $x;
}
        }

        foreach ($this->heap as $opcode) {
            yield $opcode;

            if ($this->logger) {
                $this->logger->debug($opcode);
            }
        }
    }

    /**
     * @param NodeInterface $node
     * @return iterable|Opcode[]|\Generator
     */
    private function bypass(NodeInterface $node): \Generator
    {
        foreach ($node as $child) {

            $current = $this->context->current();

            if ($child instanceof ProvidesOpcode) {
                yield from $this->extract($child);
            }

            if ($child instanceof RuleInterface) {
                yield from $this->bypass($child);
            }

            if ($current !== $this->context->current()) {
                $this->context->close();
            }
        }
    }

    /**
     * @param ProvidesOpcode $provider
     * @return \Generator|OpcodeInterface[]
     */
    private function extract(ProvidesOpcode $provider): \Generator
    {
        /** @var \Generator $iterator */
        $iterator = $provider->getOpcodes($this->context);

        while ($iterator->valid()) {
            $key = $iterator->key();

            $iterator->send(yield $key instanceof RuleInterface ? $key : $provider => $iterator->current());
        }
    }

    /**
     * @param Readable $file
     * @return RuleInterface
     * @throws SyntaxException
     */
    private function parse(Readable $file): RuleInterface
    {
        try {
            return $this->parser->parse($file);
        } catch (UnexpectedTokenException | UnrecognizedTokenException $e) {
            $error = new SyntaxException($e->getMessage(), $e->getCode());
            $error->throwsIn($file, $e->getLine(), $e->getColumn());

            throw $error;
        }
    }
}


1			<?php
2			/**
3			* This file is part of Railt package.
4			*
5			* For the full copyright and license information, please view the LICENSE
6			* file that was distributed with this source code.
7			*/
8			declare(strict_types=1);
9
10			namespace Railt\SDL\Frontend;
11
12			use Psr\Log\LoggerAwareInterface;
13			use Psr\Log\LoggerAwareTrait;
14			use Railt\Io\Readable;
15			use Railt\Parser\Ast\NodeInterface;
16			use Railt\Parser\Ast\RuleInterface;
17			use Railt\Parser\Exception\UnexpectedTokenException;
18			use Railt\Parser\Exception\UnrecognizedTokenException;
19			use Railt\SDL\Exception\SyntaxException;
20			use Railt\SDL\Frontend\AST\ProvidesOpcode;
21			use Railt\SDL\Frontend\IR\Opcode;
22			use Railt\SDL\Frontend\IR\Opcode\OpenOpcode;
23			use Railt\SDL\Frontend\IR\OpcodeHeap;
24			use Railt\SDL\Frontend\IR\OpcodeInterface;
25
26			/**
27			* Class Frontend
28			*/
29			class Frontend implements LoggerAwareInterface
30			{
31			use LoggerAwareTrait;
32
33			/**
34			* @var Parser
35			*/
36			private $parser;
37
38			/**
39			* @var OpcodeHeap
40			*/
41			private $heap;
42
43			/**
44			* @var Context
45			*/
46			private $context;
47
48			/**
49			* Frontend constructor.
50			*/
51			public function __construct()
52			{
53			$this->parser = new Parser();
54			$this->context = new Context();
55			$this->heap = new OpcodeHeap($this->context);
56			}
57
58			/**
59			* @param Readable $file
60			* @return iterable\|OpcodeInterface[]
61			* @throws SyntaxException
62			*/
63			public function load(Readable $file): iterable
64			{
65			$this->context->create();
66
67			$this->heap->add(new OpenOpcode($file), $file);
68
69			$iterator = $this->bypass($this->parse($file));
70
71			while ($iterator->valid()) {
72			[$ast, $opcode] = [$iterator->key(), $iterator->current()];
			0 ignored issues – show Bug introduced 2018-08-24 00:23 UTC by Report Bug Copy Issue Report The variable `$ast` 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... Bug introduced 2018-08-24 00:23 UTC by Report Bug Copy Issue Report The variable `$opcode` seems only to be defined at a later point. Did you maybe move this code here without moving the variable definition? This error can happen if you refactor code and forget to move the variable initialization. Let’s take a look at a simple example: function someFunction() { $x = 5; echo $x; } The above code is perfectly fine. Now imagine that we re-order the statements: function someFunction() { echo $x; $x = 5; } In that case, `$x` would be read before it is initialized. This was a very basic example, however the principle is the same for the found issue. Loading history...
73
74			$iterator->send($this->heap->add($opcode, $file, $ast->getOffset()));
			0 ignored issues – show Bug introduced 2018-08-24 00:23 UTC by Report Bug Copy Issue Report The variable `$opcode` seems only to be defined at a later point. Did you maybe move this code here without moving the variable definition? This error can happen if you refactor code and forget to move the variable initialization. Let’s take a look at a simple example: function someFunction() { $x = 5; echo $x; } The above code is perfectly fine. Now imagine that we re-order the statements: function someFunction() { echo $x; $x = 5; } In that case, `$x` would be read before it is initialized. This was a very basic example, however the principle is the same for the found issue. Loading history...
75			}
76
77			foreach ($this->heap as $opcode) {
78			yield $opcode;
79
80			if ($this->logger) {
81			$this->logger->debug($opcode);
82			}
83			}
84			}
85
86			/**
87			* @param NodeInterface $node
88			* @return iterable\|Opcode[]\|\Generator
89			*/
90			private function bypass(NodeInterface $node): \Generator
91			{
92			foreach ($node as $child) {
			0 ignored issues – show Bug introduced 2018-08-24 00:23 UTC by Report Bug Copy Issue Report The expression `$node` of type `object<Railt\Parser\Ast\NodeInterface>` is not traversable. Loading history...
93			$current = $this->context->current();
94
95			if ($child instanceof ProvidesOpcode) {
96			yield from $this->extract($child);
97			}
98
99			if ($child instanceof RuleInterface) {
100			yield from $this->bypass($child);
101			}
102
103			if ($current !== $this->context->current()) {
104			$this->context->close();
105			}
106			}
107			}
108
109			/**
110			* @param ProvidesOpcode $provider
111			* @return \Generator\|OpcodeInterface[]
112			*/
113			private function extract(ProvidesOpcode $provider): \Generator
114			{
115			/** @var \Generator $iterator */
116			$iterator = $provider->getOpcodes($this->context);
117
118			while ($iterator->valid()) {
119			$key = $iterator->key();
120
121			$iterator->send(yield $key instanceof RuleInterface ? $key : $provider => $iterator->current());
122			}
123			}
124
125			/**
126			* @param Readable $file
127			* @return RuleInterface
128			* @throws SyntaxException
129			*/
130			private function parse(Readable $file): RuleInterface
131			{
132			try {
133			return $this->parser->parse($file);
134			} catch (UnexpectedTokenException \| UnrecognizedTokenException $e) {
135			$error = new SyntaxException($e->getMessage(), $e->getCode());
136			$error->throwsIn($file, $e->getLine(), $e->getColumn());
137
138			throw $error;
139			}
140			}
141			}
142

railt / sdl

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Frontend::extract() A

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