Many helper functions are omitted for brevity.
Book
struct Book {
    MarketConfig marketConfig;
    TokenConfig tokenConfig;
    uint256 quoteTokenOpenInterestInAtoms;
    uint256 baseTokenOpenInterestInAtoms;
    uint256 nextOrderId;
    uint256 numBids;
    uint256 numAsks;
    RedBlackTree bidTree;
    RedBlackTree askTree;
    mapping(uint256 => Order) orders;
    mapping(uint256 => Limit) bidLimits;
    mapping(uint256 => Limit) askLimits;
}

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removeOrderFromBook

removeOrderFromBook
function removeOrderFromBook(
    Book storage self, 
    Order memory order
) internal
Removes a specified order from the book, updating the relevant limits and open interest.

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addOrderToBook

addOrderToBook
function addOrderToBook(
    Book storage self, 
    Order memory order
) internal
Adds a new order to the book, updating the relevant limits and open interest.

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getOrder

getOrder
function getOrder(
    Book storage self, 
    uint256 orderId
) internal view returns (Order storage)
Retrieves an order from the book using the specified order ID.

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getLimit

getLimit
function getLimit(
    Book storage self, 
    uint256 priceInTicks, 
    Side side
) internal view returns (Limit storage)
Retrieves the limit at a specified price and side (buy or sell) from the book.

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getMaxBidPriceInTicks

getMaxBidPriceInTicks
function getMaxBidPriceInTicks(
    Book storage self
) internal view returns (uint256)
Returns the maximum bid price in ticks from the book.

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getMinBidPriceInTicks

getMinBidPriceInTicks
function getMinBidPriceInTicks(
    Book storage self
) internal view returns (uint256)
Returns the minimum bid price in ticks from the book.

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getMaxAskPriceInTicks

getMaxAskPriceInTicks
function getMaxAskPriceInTicks(
    Book storage self
) internal view returns (uint256)
Returns the maximum ask price in ticks from the book.

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getMinAskPriceInTicks

getMinAskPriceInTicks
function getMinAskPriceInTicks(
    Book storage self
) internal view returns (uint256)
Returns the minimum ask price in ticks from the book.

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getMaxNumOrders

getMaxNumOrders
function getMaxNumOrders(
    Book storage self
) internal view returns (uint256)
Returns the maximum number of orders allowed in the book.

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getTOB

getTOB
function getTOB(
    Book storage self
) internal view returns (uint256, uint256)
Returns the top of book prices, which are the maximum bid and minimum ask prices.

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getNextBiggestTick

getNextBiggestTick
function getNextBiggestTick(
    Book storage self, 
    uint256 priceInTicks, 
    Side side
) internal view returns (uint256)
Finds the next biggest price tick on the specified side (buy or sell) in the book.

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getNextSmallestTick

getNextSmallestTick
function getNextSmallestTick(
    Book storage self, 
    uint256 priceInTicks, 
    Side side
) internal view returns (uint256)
Finds the next smallest price tick on the specified side (buy or sell) in the book.

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getOrders

getOrders
function getOrders(
    Book storage self, 
    uint256 startOrderId, 
    uint256 numOrders
) internal view returns (Order[] memory)
Retrieves a specified number of orders starting from a given order ID.

​
getBidLimit

getBidLimit
function getBidLimit(
    Book storage self, 
    uint256 priceInTicks
) internal view returns (Limit storage)
Retrieves the bid limit at a specified tick price from the book.

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getAskLimit

getAskLimit
function getAskLimit(
    Book storage self, 
    uint256 priceInTicks
) internal view returns (Limit storage)
Retrieves the ask limit at a specified tick price from the book.

​
getOpenInterest

getOpenInterest
function getOpenInterest(
    Book storage self
) internal view returns (uint256, uint256)
Returns the current open interest for both quote and base tokens in atoms.