Remorhaz\UniLex\Parser\LL1\Lookup\Set

Complexity

Total Complexity

9

Size/Duplication

Total Lines	75
Duplicated Lines	0 %

Importance

Changes

0

6 Methods

Rating	Name	Duplication	Size	Complexity
A	mergeTokens()	0	3	1
A	increaseChangeCount()	0	3	1
A	getTokens()	0	3	1
A	getChangeCount()	0	3	1
A	resetChangeCount()	0	3	1
A	addToken()	0	16	4

<?php

declare(strict_types=1);

namespace Remorhaz\UniLex\Parser\LL1\Lookup;

abstract class Set
{
    /**
     * @var array
     */
    private $tokenMap = [];

    /**
     * This counter increases each time changes are made to set.
     *
     * @var int
     */
    private $changeCount = 0;

    /**
     * Adds list of tokens to the set.
     *
     * @param int $symbolId
     * @param int ...$tokenIdList
     */
    public function addToken(int $symbolId, int ...$tokenIdList): void
    {
        if (empty($tokenIdList)) {
            return;
        }
        if (!isset($this->tokenMap[$symbolId])) {
            $this->tokenMap[$symbolId] = $tokenIdList;
            $this->increaseChangeCount(count($tokenIdList));
            return;
        }
        $newTokenIdList = array_diff($tokenIdList, $this->tokenMap[$symbolId]);
        if (empty($newTokenIdList)) {
            return;
        }
        $this->tokenMap[$symbolId] = array_merge($this->tokenMap[$symbolId], $newTokenIdList);
        $this->increaseChangeCount(count($newTokenIdList));
    }

    protected function increaseChangeCount(int $amount = 1): void
    {
        $this->changeCount += $amount;
    }

    public function getTokens(int $symbolId): array
    {
        return $this->tokenMap[$symbolId] ?? [];
    }

    /**
     * Returns amount of changes since last reset.
     *
     * @return int
     */
    public function getChangeCount(): int
    {
        return $this->changeCount;
    }

    /**
     * Resets changes counter.
     */
    public function resetChangeCount(): void
    {
        $this->changeCount = 0;
    }

    /**
     * Merges token sets.
     *
     * @param int $targetSymbolId
     * @param int $sourceSymbolId
     */
    public function mergeTokens(int $targetSymbolId, int $sourceSymbolId): void
    {
        $this->addToken($targetSymbolId, ...$this->getTokens($sourceSymbolId));
    }
}