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add pattern Interpreter

This commit is contained in:
Roman Martinuk
2021-03-14 18:40:48 +03:00
parent bd124378c5
commit af0fccfef3
7 changed files with 158 additions and 0 deletions

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<?php declare(strict_types=1);
namespace DesignPatterns\Behavioral\Interpreter;
abstract class AbstractExp
{
abstract public function interpret(Context $context): bool;
}

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<?php declare(strict_types=1);
namespace DesignPatterns\Behavioral\Interpreter;
class AndExp extends AbstractExp
{
private AbstractExp $first;
private AbstractExp $second;
public function __construct(AbstractExp $first, AbstractExp $second)
{
$this->first = $first;
$this->second = $second;
}
public function interpret(Context $context): bool
{
return (bool) $this->first->interpret($context) && $this->second->interpret($context);
}
}

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<?php declare(strict_types=1);
namespace DesignPatterns\Behavioral\Interpreter;
use Exception;
class Context
{
private array $poolVariable;
public function lookUp(string $name): bool
{
if (!key_exists($name, $this->poolVariable)) {
throw new Exception("no exist variable: $name");
}
return $this->poolVariable[$name];
}
public function assign(VariableExp $variable, bool $val)
{
$this->poolVariable[$variable->getName()] = $val;
}
}

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<?php declare(strict_types=1);
namespace DesignPatterns\Behavioral\Interpreter;
class OrExp extends AbstractExp
{
private AbstractExp $first;
private AbstractExp $second;
public function __construct(AbstractExp $first, AbstractExp $second)
{
$this->first = $first;
$this->second = $second;
}
public function interpret(Context $context): bool
{
return $this->first->interpret($context) || $this->second->interpret($context);
}
}

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<?php declare(strict_types=1);
namespace DesignPatterns\Behavioral\Interpreter\Tests;
use DesignPatterns\Behavioral\Interpreter\AndExp;
use DesignPatterns\Behavioral\Interpreter\Context;
use DesignPatterns\Behavioral\Interpreter\OrExp;
use DesignPatterns\Behavioral\Interpreter\VariableExp;
use PHPUnit\Framework\TestCase;
class InterpreterTest extends TestCase
{
private Context $context;
private VariableExp $a;
private VariableExp $b;
private VariableExp $c;
public function setUp(): void
{
$this->context = new Context();
$this->a = new VariableExp('A');
$this->b = new VariableExp('B');
$this->c = new VariableExp('C');
}
public function testOr()
{
$this->context->assign($this->a, false);
$this->context->assign($this->b, false);
$this->context->assign($this->c, true);
// A B
$exp1 = new OrExp($this->a, $this->b);
$result1 = $exp1->interpret($this->context);
$this->assertFalse($result1, 'A B must false');
// $exp1 C
$exp2 = new OrExp($exp1, $this->c);
$result2 = $exp2->interpret($this->context);
$this->assertTrue($result2, '(A B) C must true');
}
public function testAnd()
{
$this->context->assign($this->a, true);
$this->context->assign($this->b, true);
$this->context->assign($this->c, false);
// A ∧ B
$exp1 = new AndExp($this->a, $this->b);
$result1 = $exp1->interpret($this->context);
$this->assertTrue($result1, 'A ∧ B must true');
// $exp1 ∧ C
$exp2 = new AndExp($exp1, $this->c);
$result2 = $exp2->interpret($this->context);
$this->assertFalse($result2, '(A ∧ B) ∧ C must false');
}
}

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<?php declare(strict_types=1);
namespace DesignPatterns\Behavioral\Interpreter;
class VariableExp extends AbstractExp
{
private string $name;
public function __construct(string $name)
{
$this->name = $name;
}
public function interpret(Context $context): bool
{
return $context->lookUp($this->name);
}
public function getName(): string
{
return $this->name;
}
}

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