refactor: dry swap (#421)

* remove duplicate functions
* GSW-1838 refactor: Using the new constructor to protect raw data in sqrtRatio calculations
* GSW-1838 refactor: need to lock pool.slot0 to prevent re-entry
* refactor: Using clone data to protect original data
* refactor: remove unused import
* fix: sqrtRatio calculation default value issue
* refactor: swap and swap math
* refactor: computeSwapStep
- edge case test (amount : zero and over liquidity)
- EXACT IN / EXACT OUT Case
* refactor: Separate pool transfer-related test code
* refactor: Rename a receiver function param and liquidity math bug fix
- Fix absolute value before checking if delta value is negative to fix handling error issue if negative.
- Rename the param in the receiver function from pool to p.
* refactor: Changed large numbers to const for readability & removed some comments
* refactor: Remove unnecessary function usage
* refactor: Fix error messages to make their meaning clear

---------

Co-authored-by: 0xTopaz <[email protected]>
Co-authored-by: 0xTopaz <[email protected]>
Co-authored-by: Blake <[email protected]>

Author: 4 people

_deploy/p/gnoswap/pool/sqrt_price_math.gno

@@ -118,7 +118,7 @@ func sqrtPriceMathGetNextSqrtPriceFromAmount1RoundingDown(
 
 		res := new(u256.Uint).Add(sqrtPX96, quotient)
 		if res.Gt(max160) {
-			panic("sqrtPx96 + quotient overflow uint160")
+			panic("GetNextSqrtPriceFromAmount1RoundingDown sqrtPx96 + quotient overflow uint160")
 		}
 		return res
 	} else {

_deploy/r/gnoswap/common/tick_math.gno

@@ -43,34 +43,40 @@ var binaryLogConsts = [8]*u256.Uint{
 
 var (
 	shift1By32Left = u256.MustFromDecimal("4294967296") // (1 << 32)
+	maxTick        = int32(887272)
 )
 
 func TickMathGetSqrtRatioAtTick(tick int32) *u256.Uint { // uint160 sqrtPriceX96
 	absTick := abs(tick)
-	if absTick > 887272 { // MAX_TICK
+	if absTick > maxTick {
 		panic(addDetailToError(
 			errOutOfRange,
-			ufmt.Sprintf("tick_math.gno__TickMathGetSqrtRatioAtTick() || tick is out of range (larger than 887272), tick: %d", tick),
+			ufmt.Sprintf("tick is out of range (larger than 887272), tick: %d", tick),
 		))
 	}
 
-	ratio := u256.MustFromDecimal("340282366920938463463374607431768211456") // consts.Q128
+	var initialBit int32 = 0x1
+	var ratio *u256.Uint
+	if (absTick & initialBit) != 0 {
+		ratio = tickRatioMap[initialBit]
+	} else {
+		ratio = u256.MustFromDecimal("340282366920938463463374607431768211456") // consts.Q128
+	}
 
 	for mask, value := range tickRatioMap {
-		if absTick&mask != 0 {
+		if (mask != initialBit) && absTick&mask != 0 {
 			// ratio = (ratio * value) >> 128
 			ratio = ratio.Mul(ratio, value)
 			ratio = ratio.Rsh(ratio, 128)
 		}
 	}
 
 	if tick > 0 {
-		_maxUint256 := u256.MustFromDecimal("115792089237316195423570985008687907853269984665640564039457584007913129639935") // consts.MAX_UINT256
-		_tmp := new(u256.Uint).Div(_maxUint256, ratio)
-		ratio = _tmp.Clone()
+		maxUint256 := u256.MustFromDecimal("115792089237316195423570985008687907853269984665640564039457584007913129639935") // consts.MAX_UINT256
+		ratio = new(u256.Uint).Div(maxUint256, ratio)
 	}
 
-	shifted := ratio.Rsh(ratio, 32).Clone()       // ratio >> 32
+	shifted := new(u256.Uint).Rsh(ratio, 32)      // ratio >> 32
 	remainder := ratio.Mod(ratio, shift1By32Left) // ratio % (1 << 32)
 
 	var adj *u256.Uint

_deploy/r/gnoswap/consts/consts.gno

@@ -90,9 +90,8 @@ const (
 	UINT64_MAX uint64 = 18446744073709551615
 
 	MAX_UINT128 string = "340282366920938463463374607431768211455"
-
 	MAX_UINT160 string = "1461501637330902918203684832716283019655932542975"
-
+	MAX_INT256  string = "57896044618658097711785492504343953926634992332820282019728792003956564819968"
 	MAX_UINT256 string = "115792089237316195423570985008687907853269984665640564039457584007913129639935"
 
 	// Tick Related