@alcorexchange/alcor-swap-sdk/build/esm/utils/sqrtPriceMath.js

​​ **npm** ``` npm i @alcorexchange/alcor-swap-sdk ``` **yarn** ``` yarn add @alcorexchange/alcor-swap-sdk ``` ## Usage ### Import:

function _classCallCheck(a, n) { if (!(a instanceof n)) throw new TypeError("Cannot call a class as a function"); }
function _defineProperties(e, r) { for (var t = 0; t < r.length; t++) { var o = r[t]; o.enumerable = o.enumerable || !1, o.configurable = !0, "value" in o && (o.writable = !0), Object.defineProperty(e, _toPropertyKey(o.key), o); } }
function _createClass(e, r, t) { return r && _defineProperties(e.prototype, r), t && _defineProperties(e, t), Object.defineProperty(e, "prototype", { writable: !1 }), e; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == typeof i ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != typeof t || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != typeof i) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
import { ONE, ZERO, Q64, MaxUint128 } from "../internalConstants";
import { FullMath } from "./fullMath";
function multiplyIn128(x, y) {
  const product = x * y;
  return product & MaxUint128;
}
function addIn128(x, y) {
  const sum = x + y;
  return sum & MaxUint128;
}
export let SqrtPriceMath = /*#__PURE__*/function () {
  /**
   * Cannot be constructed.
   */
  function SqrtPriceMath() {
    _classCallCheck(this, SqrtPriceMath);
  }
  return _createClass(SqrtPriceMath, null, [{
    key: "getAmountADelta",
    value: function getAmountADelta(sqrtRatioLX64, sqrtRatioUX64, liquidity, roundUp) {
      if (sqrtRatioLX64 > sqrtRatioUX64) {
        [sqrtRatioLX64, sqrtRatioUX64] = [sqrtRatioUX64, sqrtRatioLX64];
      }
      const numerator1 = liquidity << BigInt(64);
      const numerator2 = sqrtRatioUX64 - sqrtRatioLX64;
      if (roundUp) {
        const mul1 = FullMath.mulDivRoundingUp(numerator1, numerator2, sqrtRatioUX64);
        return FullMath.mulDivRoundingUp(mul1, ONE, sqrtRatioLX64);
      } else {
        const mul1 = numerator1 * numerator2 / sqrtRatioUX64;
        return mul1 / sqrtRatioLX64;
      }
    }
  }, {
    key: "getAmountBDelta",
    value: function getAmountBDelta(sqrtRatioLX64, sqrtRatioUX64, liquidity, roundUp) {
      if (sqrtRatioLX64 > sqrtRatioUX64) {
        [sqrtRatioLX64, sqrtRatioUX64] = [sqrtRatioUX64, sqrtRatioLX64];
      }
      const diff = sqrtRatioUX64 - sqrtRatioLX64;
      if (roundUp) {
        return FullMath.mulDivRoundingUp(liquidity, diff, Q64);
      } else {
        return liquidity * diff / Q64;
      }
    }
  }, {
    key: "getNextSqrtPriceFromInput",
    value: function getNextSqrtPriceFromInput(sqrtPX64, liquidity, amountIn, zeroForOne) {
      // Убраны invariant для ускорения, если данные валидны
      return zeroForOne ? this.getNextSqrtPriceFromAmountARoundingUp(sqrtPX64, liquidity, amountIn, true) : this.getNextSqrtPriceFromAmountBRoundingDown(sqrtPX64, liquidity, amountIn, true);
    }
  }, {
    key: "getNextSqrtPriceFromOutput",
    value: function getNextSqrtPriceFromOutput(sqrtPX64, liquidity, amountOut, zeroForOne) {
      // Убраны invariant для ускорения, если данные валидны
      return zeroForOne ? this.getNextSqrtPriceFromAmountBRoundingDown(sqrtPX64, liquidity, amountOut, false) : this.getNextSqrtPriceFromAmountARoundingUp(sqrtPX64, liquidity, amountOut, false);
    }
  }, {
    key: "getNextSqrtPriceFromAmountARoundingUp",
    value: function getNextSqrtPriceFromAmountARoundingUp(sqrtPX64, liquidity, amount, add) {
      if (amount === ZERO) return sqrtPX64;
      const numerator1 = liquidity << BigInt(64);
      if (add) {
        const product = multiplyIn128(amount, sqrtPX64);
        if (product / amount === sqrtPX64) {
          const denominator = addIn128(numerator1, product);
          if (denominator >= numerator1) {
            return FullMath.mulDivRoundingUp(numerator1, sqrtPX64, denominator);
          }
        }
        const adjustedDenominator = numerator1 / sqrtPX64 + amount;
        return FullMath.mulDivRoundingUp(numerator1, ONE, adjustedDenominator);
      } else {
        const product = multiplyIn128(amount, sqrtPX64);
        // Убрана invariant, предполагаем, что numerator1 > product
        const denominator = numerator1 - product;
        return FullMath.mulDivRoundingUp(numerator1, sqrtPX64, denominator);
      }
    }
  }, {
    key: "getNextSqrtPriceFromAmountBRoundingDown",
    value: function getNextSqrtPriceFromAmountBRoundingDown(sqrtPX64, liquidity, amount, add) {
      if (add) {
        const quotient = amount <= MaxUint128 ? (amount << BigInt(64)) / liquidity : amount * Q64 / liquidity;
        return sqrtPX64 + quotient;
      } else {
        const quotient = FullMath.mulDivRoundingUp(amount, Q64, liquidity);
        // Убрана invariant, предполагаем, что sqrtPX64 > quotient
        return sqrtPX64 - quotient;
      }
    }
  }]);
}();