Renderer.php

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<?php
namespace Magento\Tax\Block\Item\Price;

use Magento\Framework\Pricing\PriceCurrencyInterface;
use Magento\Framework\Pricing\Render as PricingRender;
use Magento\Framework\View\Element\Template\Context;
use Magento\Quote\Model\Quote\Item\AbstractItem as QuoteItem;
use Magento\Sales\Model\Order\CreditMemo\Item as CreditMemoItem;
use Magento\Sales\Model\Order\Invoice\Item as InvoiceItem;
use Magento\Sales\Model\Order\Item as OrderItem;
use Magento\Tax\Helper\Data as TaxHelper;

class Renderer extends \Magento\Framework\View\Element\Template
{
    protected $taxHelper;

    protected $item;

    protected $storeId = null;

    protected $zone = null;

    protected $priceCurrency;

    public function __construct(
        Context $context,
        TaxHelper $taxHelper,
        PriceCurrencyInterface $priceCurrency,
        array $data = []
    ) {
        $this->priceCurrency = $priceCurrency;
        $this->taxHelper = $taxHelper;
        if (isset($data['zone'])) {
            $this->zone = $data['zone'];
        }
        parent::__construct($context, $data);
    }

    public function setItem($item)
    {
        $this->item = $item;
        $this->storeId = $item->getStoreId();
        return $this;
    }

    public function getZone()
    {
        return $this->zone;
    }

    public function setZone($zone)
    {
        $this->zone = $zone;
        return $this;
    }

    public function getStoreId()
    {
        return $this->storeId;
    }

    public function getItem()
    {
        return $this->item;
    }

    public function displayPriceInclTax()
    {
        switch ($this->zone) {
            case PricingRender::ZONE_CART:
                return $this->taxHelper->displayCartPriceInclTax($this->storeId);
            case PricingRender::ZONE_EMAIL:
            case PricingRender::ZONE_SALES:
                return $this->taxHelper->displaySalesPriceInclTax($this->storeId);
            default:
                return $this->taxHelper->displayCartPriceInclTax($this->storeId);
        }
    }

    public function displayPriceExclTax()
    {
        switch ($this->zone) {
            case PricingRender::ZONE_CART:
                return $this->taxHelper->displayCartPriceExclTax($this->storeId);
            case PricingRender::ZONE_EMAIL:
            case PricingRender::ZONE_SALES:
                return $this->taxHelper->displaySalesPriceExclTax($this->storeId);
            default:
                return $this->taxHelper->displayCartPriceExclTax($this->storeId);
        }
    }

    public function displayBothPrices()
    {
        switch ($this->zone) {
            case PricingRender::ZONE_CART:
                return $this->taxHelper->displayCartBothPrices($this->storeId);
            case PricingRender::ZONE_EMAIL:
            case PricingRender::ZONE_SALES:
                return $this->taxHelper->displaySalesBothPrices($this->storeId);
            default:
                return $this->taxHelper->displayCartBothPrices($this->storeId);
        }
    }

    public function formatPrice($price)
    {
        $item = $this->getItem();
        if ($item instanceof QuoteItem) {
            return $this->priceCurrency->format(
                $price,
                true,
                PriceCurrencyInterface::DEFAULT_PRECISION,
                $item->getStore()
            );
        } elseif ($item instanceof OrderItem) {
            return $item->getOrder()->formatPrice($price);
        } else {
            return $item->getOrderItem()->getOrder()->formatPrice($price);
        }
    }

    public function getItemDisplayPriceExclTax()
    {
        $item = $this->getItem();
        if ($item instanceof QuoteItem) {
            return $item->getCalculationPrice();
        } else {
            return $item->getPrice();
        }
    }

    public function getTotalAmount($item)
    {
        $totalAmount = $item->getRowTotal()
            - $item->getDiscountAmount()
            + $item->getTaxAmount()
            + $item->getDiscountTaxCompensationAmount();

        return $totalAmount;
    }

    public function getBaseTotalAmount($item)
    {
        $totalAmount = $item->getBaseRowTotal()
            - $item->getBaseDiscountAmount()
            + $item->getBaseTaxAmount()
            + $item->getBaseDiscountTaxCompensationAmount();

        return $totalAmount;
    }
}