class Rule2Literals

class Rule2Literals extends Rule {
    
    /** @var int */
    protected $literal1;
    
    /** @var int */
    protected $literal2;
    
    /**
     * @param Rule::RULE_* $reason A RULE_* constant
     * @param mixed $reasonData
     *
     * @phpstan-param ReasonData $reasonData
     */
    public function __construct(int $literal1, int $literal2, $reason, $reasonData) {
        parent::__construct($reason, $reasonData);
        if ($literal1 < $literal2) {
            $this->literal1 = $literal1;
            $this->literal2 = $literal2;
        }
        else {
            $this->literal1 = $literal2;
            $this->literal2 = $literal1;
        }
    }
    
    /**
     * @return non-empty-list<int>
     */
    public function getLiterals() : array {
        return [
            $this->literal1,
            $this->literal2,
        ];
    }
    
    /**
     * @inheritDoc
     */
    public function getHash() {
        return $this->literal1 . ',' . $this->literal2;
    }
    
    /**
     * Checks if this rule is equal to another one
     *
     * Ignores whether either of the rules is disabled.
     *
     * @param  Rule $rule The rule to check against
     * @return bool Whether the rules are equal
     */
    public function equals(Rule $rule) : bool {
        // specialized fast-case
        if ($rule instanceof self) {
            if ($this->literal1 !== $rule->literal1) {
                return false;
            }
            if ($this->literal2 !== $rule->literal2) {
                return false;
            }
            return true;
        }
        $literals = $rule->getLiterals();
        if (2 !== \count($literals)) {
            return false;
        }
        if ($this->literal1 !== $literals[0]) {
            return false;
        }
        if ($this->literal2 !== $literals[1]) {
            return false;
        }
        return true;
    }
    
    /** @return false */
    public function isAssertion() : bool {
        return false;
    }
    
    /**
     * Formats a rule as a string of the format (Literal1|Literal2|...)
     */
    public function __toString() : string {
        $result = $this->isDisabled() ? 'disabled(' : '(';
        $result .= $this->literal1 . '|' . $this->literal2 . ')';
        return $result;
    }

}