VariableBuilder::match() - Code Metrics - Inspection of "Improve builder logic" - railt/sdl - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( b2a65d...63a169 )

by Kirill

created 2018-10-11 00:58 UTC

VariableBuilder::match() A

↳ Parent: VariableBuilder

Complexity

Conditions	1
Paths	1

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	0
CRAP Score	2

Importance

Changes

Metric	Value
cc	1
nc	1
nop	1
dl	0
loc	4
ccs	0
cts	2
cp	0
crap	2
rs	10
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\Builder\Instruction;

use Railt\Parser\Ast\RuleInterface;
use Railt\SDL\Frontend\Builder\BaseBuilder;
use Railt\SDL\Frontend\Context\ContextInterface;
use Railt\SDL\IR\SymbolTable\ValueInterface;
use Railt\SDL\IR\SymbolTable\VarSymbol;

/**
 * Class VariableBuilder
 */
class VariableBuilder extends BaseBuilder
{
    /**
     * @var string[]
     */
    private const VARIABLE_DEFINITIONS = [
        'ConstantDefinition',
        'VariableDefinition',
    ];

    /**
     * @param RuleInterface $rule
     * @return bool
     */
    public function match(RuleInterface $rule): bool
    {
        return \in_array($rule->getName(), self::VARIABLE_DEFINITIONS, true);
    }

    /**
     * @param ContextInterface $ctx
     * @param RuleInterface $rule
     * @return \Generator|\Closure
     */
    public function reduce(ContextInterface $ctx, RuleInterface $rule): \Generator
    {
        $isConstant = $this->isConstant($rule);
        $variables = [];

        foreach ($this->getVariableNames($rule) as $variable) {
            $record = $variables[] = $ctx->declare($variable);

            $isConstant ? $record->lock() : $record->unlock();
        }

        yield function () use ($rule, $variables) {
            /** @var ValueInterface $value */
            $value = yield $this->getValueNode($rule);

            /** @var VarSymbol $variable */
            foreach ($variables as $variable) {
                $variable->set($value);
            }
        };
    }

    /**
     * @param RuleInterface $rule
     * @return iterable|string[]
     */
    private function getVariableNames(RuleInterface $rule): iterable
    {
        foreach ($rule->find('> #VariableName') as $name) {
            yield $name->first('> :T_VARIABLE')->getValue(1);
        }
    }

    /**
     * @param RuleInterface $rule
     * @return RuleInterface
     */
    private function getValueNode(RuleInterface $rule): RuleInterface
    {
        return $rule->first('> #VariableValue')->getChild(0);
interface User
{
    /** @return string */
    public function getPassword();
}

class MyUser implements User
{
    public function getPassword()
    {
        // return something
    }

    public function getDisplayName()
    {
        // return some name.
    }
}

class AuthSystem
{
    public function authenticate(User $user)
    {
        $this->logger->info(sprintf('Authenticating %s.', $user->getDisplayName()));
        // do something.
    }
}
    }

    /**
     * @param RuleInterface $rule
     * @return bool
     */
    private function isConstant(RuleInterface $rule): bool
    {
        return $rule->getName() === 'ConstantDefinition';
    }
}


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\Builder\Instruction;
11
12			use Railt\Parser\Ast\RuleInterface;
13			use Railt\SDL\Frontend\Builder\BaseBuilder;
14			use Railt\SDL\Frontend\Context\ContextInterface;
15			use Railt\SDL\IR\SymbolTable\ValueInterface;
16			use Railt\SDL\IR\SymbolTable\VarSymbol;
17
18			/**
19			* Class VariableBuilder
20			*/
21			class VariableBuilder extends BaseBuilder
22			{
23			/**
24			* @var string[]
25			*/
26			private const VARIABLE_DEFINITIONS = [
27			'ConstantDefinition',
28			'VariableDefinition',
29			];
30
31			/**
32			* @param RuleInterface $rule
33			* @return bool
34			*/
35			public function match(RuleInterface $rule): bool
36			{
37			return \in_array($rule->getName(), self::VARIABLE_DEFINITIONS, true);
38			}
39
40			/**
41			* @param ContextInterface $ctx
42			* @param RuleInterface $rule
43			* @return \Generator\|\Closure
44			*/
45			public function reduce(ContextInterface $ctx, RuleInterface $rule): \Generator
46			{
47			$isConstant = $this->isConstant($rule);
48			$variables = [];
49
50			foreach ($this->getVariableNames($rule) as $variable) {
51			$record = $variables[] = $ctx->declare($variable);
52
53			$isConstant ? $record->lock() : $record->unlock();
54			}
55
56			yield function () use ($rule, $variables) {
57			/** @var ValueInterface $value */
58			$value = yield $this->getValueNode($rule);
59
60			/** @var VarSymbol $variable */
61			foreach ($variables as $variable) {
62			$variable->set($value);
63			}
64			};
65			}
66
67			/**
68			* @param RuleInterface $rule
69			* @return iterable\|string[]
70			*/
71			private function getVariableNames(RuleInterface $rule): iterable
72			{
73			foreach ($rule->find('> #VariableName') as $name) {
74			yield $name->first('> :T_VARIABLE')->getValue(1);
75			}
76			}
77
78			/**
79			* @param RuleInterface $rule
80			* @return RuleInterface
81			*/
82			private function getValueNode(RuleInterface $rule): RuleInterface
83			{
84			return $rule->first('> #VariableValue')->getChild(0);
			0 ignored issues – show Bug introduced 2018-10-11 01:01 UTC by Report Bug Copy Issue Report It seems like you code against a concrete implementation and not the interface `Railt\Parser\Ast\NodeInterface` as the method `getChild()` does only exist in the following implementations of said interface: `Railt\Compiler\Grammar\Delegate\IncludeDelegate`, `Railt\Compiler\Grammar\Delegate\RuleDelegate`, `Railt\Compiler\Grammar\Delegate\TokenDelegate`, `Railt\Parser\Ast\Rule`. Let’s take a look at an example: interface User { /** @return string / public function getPassword(); } class MyUser implements User { public function getPassword() { // return something } public function getDisplayName() { // return some name. } } class AuthSystem { public function authenticate(User $user) { $this->logger->info(sprintf('Authenticating %s.', $user->getDisplayName())); // do something. } } In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break. Available Fixes Change the type-hint for the parameter: class AuthSystem { public function authenticate(MyUser $user) { / ... / } } Add an additional type-check: class AuthSystem { public function authenticate(User $user) { if ($user instanceof MyUser) { $this->logger->info(/* ... /); } // or alternatively if ( ! $user instanceof MyUser) { throw new \LogicException( '$user must be an instance of MyUser, ' .'other instances are not supported.' ); } } } Note:* PHP Analyzer uses reverse abstract interpretation to narrow down the types inside the if block in such a case. Add the method to the interface: interface User { /** @return string / public function getPassword(); /* @return string */ public function getDisplayName(); } Loading history...
85			}
86
87			/**
88			* @param RuleInterface $rule
89			* @return bool
90			*/
91			private function isConstant(RuleInterface $rule): bool
92			{
93			return $rule->getName() === 'ConstantDefinition';
94			}
95			}
96

railt / sdl

Push — master ( b2a65d...63a169 )

VariableBuilder::match() A

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Duplication

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