Remorhaz\UniLex\Stack\SymbolStack

Complexity

Total Complexity

6

Size/Duplication

Total Lines	35
Duplicated Lines	0 %

Importance

Changes

0

4 Methods

Rating	Name	Duplication	Size	Complexity
A	push()	0	6	2
A	isEmpty()	0	3	1
A	reset()	0	3	1
A	pop()	0	6	2

<?php

declare(strict_types=1);

namespace Remorhaz\UniLex\Stack;

use Remorhaz\UniLex\Exception;

class SymbolStack implements PushInterface
{
    /**
     * @var StackableSymbolInterface[]
     */
    private $data = [];

    /**
     * @return StackableSymbolInterface
     * @throws Exception
     */
    public function pop(): StackableSymbolInterface
    {
        if (empty($this->data)) {
            throw new Exception("Unexpected end of stack");
        }
        return array_pop($this->data);
    }

    public function push(StackableSymbolInterface ...$symbolList): void
    {
        if (empty($symbolList)) {
            return;
        }
        array_push($this->data, ...array_reverse($symbolList));
    }

    public function isEmpty(): bool
    {
        return empty($this->data);
    }

    public function reset(): void
    {
        $this->data = [];
    }
}