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<?php declare( strict_types = 1 ); namespace Automattic\WooCommerce\StoreApi\Utilities; use Automattic\WooCommerce\Checkout\Helpers\ReserveStock; use Automattic\WooCommerce\StoreApi\Utilities\DraftOrderTrait; use Automattic\WooCommerce\Utilities\NumberUtil; /** * QuantityLimits class. * * Returns limits for products and cart items when using the StoreAPI and supporting classes. / final class QuantityLimits { use DraftOrderTrait; /* * Get quantity limits (min, max, step/multiple) for a product or cart item. * * @param array $cart_item A cart item array. * @return array / public function get_cart_item_quantity_limits( $cart_item ) { $product = $cart_item['data'] ?? false; if ( ! $product instanceof \WC_Product ) { return [ 'minimum' => 1, 'maximum' => 9999, 'multiple_of' => 1, 'editable' => true, ]; } return array_merge( $this->get_add_to_cart_limits( $product, $cart_item ), [ 'editable' => $this->filter_boolean_value( ! $product->is_sold_individually(), 'editable', $product, $cart_item ), ] ); } /* * Get limits for product add to cart forms. * * @param \WC_Product $product Product instance. * @param array\|null $cart_item Optional cart item associated with the product. * @return array / public function get_add_to_cart_limits( \WC_Product $product, $cart_item = null ) { // Compatibility with the woocommerce_quantity_input_args filter. Gets initial values to match classic quantity input. $args = wc_get_quantity_input_args( [], $product ); $minimum = $this->filter_numeric_value( $args['min_value'], 'minimum', $product, $cart_item ); $maximum = $this->filter_numeric_value( $this->adjust_product_quantity_limit( $args['max_value'], $product, $cart_item ), 'maximum', $product, $cart_item ); $multiple_of = $this->filter_numeric_value( $args['step'], 'multiple_of', $product, $cart_item ); // Ensure values are compatible with each other. $minimum = max( $multiple_of, $this->limit_to_multiple( $minimum, $multiple_of, 'ceil' ) ); $maximum = max( $minimum, $this->limit_to_multiple( $maximum, $multiple_of, 'floor' ) ); return [ 'minimum' => $minimum, 'maximum' => $maximum, 'multiple_of' => $multiple_of, ]; } /* * Fix a quantity violation by adjusting it to the nearest valid quantity. * * @param int\|float $quantity Quantity. * @param array $cart_item Cart item. * @return int\|float / public function normalize_cart_item_quantity( $quantity, array $cart_item ) { $product = $cart_item['data'] ?? false; if ( ! $product instanceof \WC_Product ) { return wc_stock_amount( $quantity ); } $quantity = NumberUtil::normalize( $quantity ); if ( 0 >= $quantity ) { return wc_stock_amount( 0 ); } $limits = $this->get_cart_item_quantity_limits( $cart_item ); $new_quantity = $this->limit_to_multiple( $quantity, $limits['multiple_of'], 'round' ); if ( $new_quantity < $limits['minimum'] ) { $new_quantity = $limits['minimum']; } if ( $new_quantity > $limits['maximum'] ) { $new_quantity = $limits['maximum']; } return wc_stock_amount( $new_quantity ); } /* * Return a number using the closest multiple of another number. Used to enforce step/multiple values. * * @param int\|float $number Number to round. * @param int\|float $multiple_of The multiple. * @param string $rounding_function ceil, floor, or round. * @return int\|float / public function limit_to_multiple( $number, $multiple_of, string $rounding_function = 'round' ) { // Handle edge cases. $number = NumberUtil::normalize( $number, null ); $multiple_of = NumberUtil::normalize( $multiple_of, null ); if ( is_null( $multiple_of ) \|\| is_null( $number ) ) { return 0; } if ( 0 >= $multiple_of \|\| $this->is_multiple_of( $number, $multiple_of ) ) { return $number; } // Ensure valid rounding function. $rounding_function = in_array( $rounding_function, [ 'ceil', 'floor', 'round' ], true ) ? $rounding_function : 'round'; return NumberUtil::normalize( $rounding_function( $number / $multiple_of ) $multiple_of ); } /** * Checks if a number is a multiple of another number. * * @param int\|float $number The number to check. * @param int\|float $multiple_of The multiple. * @return bool / protected function is_multiple_of( $number, $multiple_of ) { if ( 0 >= $multiple_of ) { return false; } $division_result = $number / $multiple_of; // Use tolerance for floating-point comparison to handle precision errors. // Example: 0.3 / 0.1 = 2.9999999999999996 instead of exactly 3.0 due to floating-point precision. return abs( $division_result - round( $division_result ) ) < 0.0001; } /* * Check that a given quantity is valid according to any limits in place. * * @param int\|float $quantity Quantity to validate. * @param array $cart_item Cart item. * @return \WP_Error\|true / public function validate_cart_item_quantity( $quantity, $cart_item ) { $limits = $this->get_cart_item_quantity_limits( $cart_item ); $product = $cart_item['data'] ?? false; $quantity = wc_stock_amount( $quantity ); if ( ! $product instanceof \WC_Product ) { return true; } if ( ! $limits['editable'] && $quantity > $limits['maximum'] ) { / translators: 1: product name / return new \WP_Error( 'readonly_quantity', sprintf( __( 'The quantity of "%1$s" cannot be changed', 'woocommerce' ), $product->get_name() ) ); } if ( $quantity < $limits['minimum'] ) { / translators: 1: product name 2: minimum quantity / return new \WP_Error( 'invalid_quantity', sprintf( __( 'The minimum quantity of "%1$s" allowed in the cart is %2$s', 'woocommerce' ), $product->get_name(), $limits['minimum'] ) ); } if ( $quantity > $limits['maximum'] ) { / translators: 1: product name 2: maximum quantity / return new \WP_Error( 'invalid_quantity', sprintf( __( 'The maximum quantity of "%1$s" allowed in the cart is %2$s', 'woocommerce' ), $product->get_name(), $limits['maximum'] ) ); } if ( ! $this->is_multiple_of( $quantity, NumberUtil::normalize( $limits['multiple_of'] ) ) ) { / translators: 1: product name 2: multiple of / return new \WP_Error( 'invalid_quantity', sprintf( __( 'The quantity of "%1$s" must be a multiple of %2$s', 'woocommerce' ), $product->get_name(), $limits['multiple_of'] ) ); } return true; } /* * Get the limit for the total number of a product allowed in the cart. * * This is based on product properties, including remaining stock, and defaults to a maximum of 9999 of any product * in the cart at once. * * @param int\|float $purchase_limit The purchase limit from the product. Usually maps to `get_max_purchase_quantity`. * @param \WC_Product $product Product instance. * @param array\|null $cart_item Optional cart item associated with the product. * @return int\|float / protected function adjust_product_quantity_limit( $purchase_limit, \WC_Product $product, $cart_item = null ) { $limits = [ $purchase_limit > 0 ? $purchase_limit : 9999 ]; // If managing stock and backorders are not allowed, get the remaining stock considering active carts. if ( $product->managing_stock() && ! $product->backorders_allowed() ) { $limits[] = $this->get_remaining_stock( $product ); } return $this->filter_numeric_value( min( array_filter( $limits ) ), 'limit', $product, $cart_item ); } /* * Returns the remaining stock for a product if it has stock. * * This also factors in draft orders. * * @param \WC_Product $product Product instance. * @return int\|float\|null / protected function get_remaining_stock( \WC_Product $product ) { if ( is_null( $product->get_stock_quantity() ) ) { return null; } $reserve_stock = new ReserveStock(); $reserved_stock = $reserve_stock->get_reserved_stock( $product, $this->get_draft_order_id() ); return wc_stock_amount( $product->get_stock_quantity() - $reserved_stock ); } /* * Get a numeric value while running it through a filter hook. * * @param int\|float $value Value to filter. * @param string $value_type Type of value. Used for filter suffix. * @param \WC_Product $product Product instance. * @param array\|null $cart_item Optional cart item associated with the product. * @return int\|float / protected function filter_numeric_value( $value, string $value_type, \WC_Product $product, $cart_item = null ) { /* * Filters a quantity for a cart item in Store API. This allows extensions to control the qty of items. * * The suffix of the hook will vary depending on the value being filtered. * For example, minimum, maximum, multiple_of, editable. * * @since 6.8.0 * * @param mixed $value The value being filtered. * @param \WC_Product $product The product object. * @param array\|null $cart_item The cart item if the product exists in the cart, or null. * @return mixed / $filtered_value = apply_filters( 'woocommerce_store_api_product_quantity_' . $value_type, $value, $product, $cart_item ); return wc_stock_amount( NumberUtil::normalize( $filtered_value, $value ) ); } /* * Get a boolean value while running it through a filter hook. * * @param bool $value Value to filter. * @param string $value_type Type of value. Used for filter suffix. * @param \WC_Product $product Product instance. * @param array\|null $cart_item Optional cart item associated with the product. * @return bool / protected function filter_boolean_value( $value, string $value_type, \WC_Product $product, $cart_item = null ) { /* * Filters boolean data for a cart item in Store API. * * The suffix of the hook will vary depending on the value being filtered. For example, editable. * * @since 6.8.0 * * @param mixed $value The value being filtered. * @param \WC_Product $product The product object. * @param array\|null $cart_item The cart item if the product exists in the cart, or null. * @return mixed */ $filtered_value = apply_filters( 'woocommerce_store_api_product_quantity_' . $value_type, $value, $product, $cart_item ); return is_bool( $filtered_value ) ? $filtered_value : (bool) $value; } }

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