Adjustment.php

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<?php
namespace Magento\Tax\Pricing\Render;

use Magento\Framework\Pricing\PriceCurrencyInterface;
use Magento\Framework\Pricing\Render\AbstractAdjustment;
use Magento\Framework\View\Element\Template;

class Adjustment extends AbstractAdjustment
{
    protected $taxHelper;

    public function __construct(
        Template\Context $context,
        PriceCurrencyInterface $priceCurrency,
        \Magento\Tax\Helper\Data $helper,
        array $data = []
    ) {
        $this->taxHelper = $helper;
        parent::__construct($context, $priceCurrency, $data);
    }

    protected function apply()
    {
        if ($this->displayBothPrices()) {
            if ($this->getZone() !== \Magento\Framework\Pricing\Render::ZONE_ITEM_OPTION) {
                $this->amountRender->setPriceDisplayLabel(__('Incl. Tax'));
            }
            $this->amountRender->setPriceWrapperCss('price-including-tax');
            $this->amountRender->setPriceId(
                $this->buildIdWithPrefix('price-including-tax-')
            );
        } elseif ($this->displayPriceExcludingTax()) {
            $this->amountRender->setDisplayValue(
                $this->amountRender->getAmount()->getValue($this->getAdjustmentCode())
            );
            if ($this->taxHelper->priceIncludesTax() && $this->amountRender->getPriceType() == 'finalPrice') {
                // for dynamic calculations of prices with any options, use the base price amount
                $this->amountRender->setPriceType('basePrice');
            }
        }
        return $this->toHtml();
    }

    public function getAdjustmentCode()
    {
        return \Magento\Tax\Pricing\Adjustment::ADJUSTMENT_CODE;
    }

    public function displayBothPrices()
    {
        return $this->taxHelper->displayBothPrices();
    }

    public function getDisplayAmountExclTax($exclude = null, $includeContainer = false)
    {
        //If exclude is not supplied, use the default
        if ($exclude === null) {
            $exclude = $this->getDefaultExclusions();
        }

        return $this->formatCurrency(
            $this->getRawAmount($exclude),
            $includeContainer
        );
    }

    public function getRawAmount($exclude = null)
    {
        //If exclude is not supplied, use the default
        if ($exclude === null) {
            $exclude = $this->getDefaultExclusions();
        }

        return $this->amountRender->getAmount()->getValue($exclude);
    }

    public function getDefaultExclusions()
    {
        return [$this->getAdjustmentCode()];
    }

    public function getDisplayAmount($includeContainer = true)
    {
        return $this->formatCurrency($this->getRawAmount([]), $includeContainer);
    }

    public function buildIdWithPrefix($prefix)
    {
        $priceId = $this->getPriceId();
        if (!$priceId) {
            $priceId = $this->getSaleableItem()->getId();
        }
        return $prefix . $priceId . $this->getIdSuffix();
    }

    public function displayPriceIncludingTax()
    {
        return $this->taxHelper->displayPriceIncludingTax();
    }

    public function displayPriceExcludingTax()
    {
        return $this->taxHelper->displayPriceExcludingTax();
    }
}