started on orderlib

src/OrderLib.sol

@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity =0.7.6;
+
+library OrderLib {
+
+    uint64 internal constant NO_CHAIN = type(uint64).max;
+    uint8 internal constant NUM_OCO_GROUPS = 6;
+
+    enum SwapOrderState {
+        Open, Canceled, Filled, Template
+    }
+
+    struct SwapOrder {
+        address tokenIn;
+        address tokenOut;
+        uint24 fee;
+        uint256 amount;
+        bool amountIsInput;
+        bool outputDirectlyToOwner;
+        Tranche[] tranches;
+        uint64 chainOrder; // use NO_CHAIN for no chaining. chainOrder index must be < than this order's index for safety (written first) and chainOrder state must be Template
+    }
+
+    struct SwapOrderStatus {
+        SwapOrderState state;
+        SwapOrder order;
+        uint256 filled;
+        uint256 net;  // received after fees, conversions, taxes, etc
+        bool[NUM_OCO_GROUPS] ocoTriggered; // if true then the group has been canceled
+    }
+
+    enum ConstraintMode {
+        Limit,
+        Barrier,
+        Trailing,
+        Time
+    }
+
+    struct PriceConstraint {
+        PriceConstraintMode mode;
+        bool isAbove;
+        bool isRatio;
+        uint160 valueSqrtX96;
+    }
+
+
+    enum TimeMode {
+        Timestamp,      // absolute timestamp
+        SinceOrderStart // relative to order creation (useful for chained orders)
+    }
+
+    struct Time {
+        TimeMode mode;
+        uint32 time;
+    }
+
+    Time constant DISTANT_PAST = Time(TimeMode.Timestamp, 0);
+    Time constant DISTANT_FUTURE = Time(TimeMode.Timestamp, type(uint32).max);
+
+    uint8 internal constant NO_OCO = 255;
+
+    struct Tranche {
+        uint64 fraction; // 18-decimal fraction of the order amount which is available to this tranche. must be <= 1
+        uint8 ocoGroup; // 0-5 are six valid groups, indexing ocoTriggered. use NO_OCO to disable oco functionality.
+        Time earliest; // earliest block timestamp for execution. use DISTANT_PAST to disable
+        Time latest; // latest block timestamp for execution (inclusive).  use DISTANT_FUTURE to disable
+        PriceConstraint[] constraints;
+    }
+
+}