327 lines
12 KiB
JavaScript
327 lines
12 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.FixedNumber = exports.FixedFormat = exports.parseFixed = exports.formatFixed = void 0;
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const data_js_1 = require("./data.js");
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const errors_js_1 = require("./errors.js");
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const maths_js_1 = require("./maths.js");
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const _guard = {};
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const NegativeOne = BigInt(-1);
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function throwFault(message, fault, operation, value) {
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const params = { fault: fault, operation: operation };
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if (value !== undefined) {
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params.value = value;
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}
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(0, errors_js_1.assert)(false, message, "NUMERIC_FAULT", params);
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}
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// Constant to pull zeros from for multipliers
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let zeros = "0";
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while (zeros.length < 256) {
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zeros += zeros;
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}
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// Returns a string "1" followed by decimal "0"s
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function getMultiplier(decimals) {
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(0, errors_js_1.assertArgument)(Number.isInteger(decimals) && decimals >= 0 && decimals <= 256, "invalid decimal length", "decimals", decimals);
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return BigInt("1" + zeros.substring(0, decimals));
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}
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function formatFixed(_value, _decimals) {
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if (_decimals == null) {
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_decimals = 18;
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}
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let value = (0, maths_js_1.getBigInt)(_value, "value");
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const decimals = (0, maths_js_1.getNumber)(_decimals, "decimals");
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const multiplier = getMultiplier(decimals);
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const multiplierStr = String(multiplier);
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const negative = (value < 0);
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if (negative) {
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value *= NegativeOne;
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}
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let fraction = String(value % multiplier);
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// Make sure there are enough place-holders
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while (fraction.length < multiplierStr.length - 1) {
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fraction = "0" + fraction;
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}
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// Strip training 0
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while (fraction.length > 1 && fraction.substring(fraction.length - 1) === "0") {
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fraction = fraction.substring(0, fraction.length - 1);
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}
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let result = String(value / multiplier);
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if (multiplierStr.length !== 1) {
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result += "." + fraction;
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}
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if (negative) {
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result = "-" + result;
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}
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return result;
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}
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exports.formatFixed = formatFixed;
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function parseFixed(value, _decimals) {
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if (_decimals == null) {
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_decimals = 18;
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}
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const decimals = (0, maths_js_1.getNumber)(_decimals, "decimals");
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const multiplier = getMultiplier(decimals);
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(0, errors_js_1.assertArgument)(typeof (value) === "string" && value.match(/^-?[0-9.]+$/), "invalid decimal value", "value", value);
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// Is it negative?
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const negative = (value.substring(0, 1) === "-");
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if (negative) {
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value = value.substring(1);
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}
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(0, errors_js_1.assertArgument)(value !== ".", "missing value", "value", value);
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// Split it into a whole and fractional part
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const comps = value.split(".");
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(0, errors_js_1.assertArgument)(comps.length <= 2, "too many decimal points", "value", value);
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let whole = (comps[0] || "0"), fraction = (comps[1] || "0");
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// Trim trialing zeros
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while (fraction[fraction.length - 1] === "0") {
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fraction = fraction.substring(0, fraction.length - 1);
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}
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// Check the fraction doesn't exceed our decimals size
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if (fraction.length > String(multiplier).length - 1) {
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throwFault("fractional component exceeds decimals", "underflow", "parseFixed");
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}
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// If decimals is 0, we have an empty string for fraction
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if (fraction === "") {
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fraction = "0";
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}
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// Fully pad the string with zeros to get to wei
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while (fraction.length < String(multiplier).length - 1) {
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fraction += "0";
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}
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const wholeValue = BigInt(whole);
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const fractionValue = BigInt(fraction);
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let wei = (wholeValue * multiplier) + fractionValue;
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if (negative) {
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wei *= NegativeOne;
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}
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return wei;
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}
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exports.parseFixed = parseFixed;
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class FixedFormat {
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signed;
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width;
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decimals;
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name;
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_multiplier;
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constructor(guard, signed, width, decimals) {
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(0, errors_js_1.assertPrivate)(guard, _guard, "FixedFormat");
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this.signed = signed;
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this.width = width;
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this.decimals = decimals;
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this.name = (signed ? "" : "u") + "fixed" + String(width) + "x" + String(decimals);
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this._multiplier = getMultiplier(decimals);
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Object.freeze(this);
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}
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static from(value) {
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if (value instanceof FixedFormat) {
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return value;
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}
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if (typeof (value) === "number") {
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value = `fixed128x${value}`;
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}
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let signed = true;
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let width = 128;
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let decimals = 18;
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if (typeof (value) === "string") {
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if (value === "fixed") {
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// defaults...
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}
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else if (value === "ufixed") {
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signed = false;
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}
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else {
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const match = value.match(/^(u?)fixed([0-9]+)x([0-9]+)$/);
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(0, errors_js_1.assertArgument)(match, "invalid fixed format", "format", value);
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signed = (match[1] !== "u");
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width = parseInt(match[2]);
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decimals = parseInt(match[3]);
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}
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}
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else if (value) {
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const check = (key, type, defaultValue) => {
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if (value[key] == null) {
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return defaultValue;
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}
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(0, errors_js_1.assertArgument)(typeof (value[key]) === type, "invalid fixed format (" + key + " not " + type + ")", "format." + key, value[key]);
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return value[key];
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};
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signed = check("signed", "boolean", signed);
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width = check("width", "number", width);
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decimals = check("decimals", "number", decimals);
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}
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(0, errors_js_1.assertArgument)((width % 8) === 0, "invalid fixed format width (not byte aligned)", "format.width", width);
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(0, errors_js_1.assertArgument)(decimals <= 80, "invalid fixed format (decimals too large)", "format.decimals", decimals);
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return new FixedFormat(_guard, signed, width, decimals);
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}
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}
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exports.FixedFormat = FixedFormat;
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/**
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* Fixed Number class
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*/
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class FixedNumber {
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format;
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_isFixedNumber;
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//#hex: string;
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#value;
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constructor(guard, hex, value, format) {
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(0, errors_js_1.assertPrivate)(guard, _guard, "FixedNumber");
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this.format = FixedFormat.from(format);
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//this.#hex = hex;
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this.#value = value;
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this._isFixedNumber = true;
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Object.freeze(this);
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}
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#checkFormat(other) {
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(0, errors_js_1.assertArgument)(this.format.name === other.format.name, "incompatible format; use fixedNumber.toFormat", "other", other);
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}
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/**
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* Returns a new [[FixedNumber]] with the result of this added
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* to %%other%%.
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*/
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addUnsafe(other) {
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this.#checkFormat(other);
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const a = parseFixed(this.#value, this.format.decimals);
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const b = parseFixed(other.#value, other.format.decimals);
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return FixedNumber.fromValue(a + b, this.format.decimals, this.format);
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}
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subUnsafe(other) {
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this.#checkFormat(other);
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const a = parseFixed(this.#value, this.format.decimals);
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const b = parseFixed(other.#value, other.format.decimals);
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return FixedNumber.fromValue(a - b, this.format.decimals, this.format);
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}
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mulUnsafe(other) {
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this.#checkFormat(other);
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const a = parseFixed(this.#value, this.format.decimals);
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const b = parseFixed(other.#value, other.format.decimals);
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return FixedNumber.fromValue((a * b) / this.format._multiplier, this.format.decimals, this.format);
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}
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divUnsafe(other) {
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this.#checkFormat(other);
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const a = parseFixed(this.#value, this.format.decimals);
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const b = parseFixed(other.#value, other.format.decimals);
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return FixedNumber.fromValue((a * this.format._multiplier) / b, this.format.decimals, this.format);
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}
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floor() {
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const comps = this.toString().split(".");
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if (comps.length === 1) {
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comps.push("0");
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}
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let result = FixedNumber.from(comps[0], this.format);
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const hasFraction = !comps[1].match(/^(0*)$/);
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if (this.isNegative() && hasFraction) {
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result = result.subUnsafe(ONE.toFormat(result.format));
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}
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return result;
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}
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ceiling() {
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const comps = this.toString().split(".");
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if (comps.length === 1) {
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comps.push("0");
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}
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let result = FixedNumber.from(comps[0], this.format);
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const hasFraction = !comps[1].match(/^(0*)$/);
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if (!this.isNegative() && hasFraction) {
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result = result.addUnsafe(ONE.toFormat(result.format));
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}
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return result;
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}
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// @TODO: Support other rounding algorithms
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round(decimals) {
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if (decimals == null) {
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decimals = 0;
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}
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// If we are already in range, we're done
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const comps = this.toString().split(".");
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if (comps.length === 1) {
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comps.push("0");
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}
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(0, errors_js_1.assertArgument)(Number.isInteger(decimals) && decimals >= 0 && decimals <= 80, "invalid decimal count", "decimals", decimals);
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if (comps[1].length <= decimals) {
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return this;
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}
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const factor = FixedNumber.from("1" + zeros.substring(0, decimals), this.format);
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const bump = BUMP.toFormat(this.format);
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return this.mulUnsafe(factor).addUnsafe(bump).floor().divUnsafe(factor);
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}
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isZero() {
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return (this.#value === "0.0" || this.#value === "0");
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}
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isNegative() {
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return (this.#value[0] === "-");
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}
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toString() { return this.#value; }
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toHexString(_width) {
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throw new Error("TODO");
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/*
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return toHex();
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if (width == null) { return this.#hex; }
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const width = logger.getNumeric(_width);
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if (width % 8) { logger.throwArgumentError("invalid byte width", "width", width); }
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const hex = BigNumber.from(this.#hex).fromTwos(this.format.width).toTwos(width).toHexString();
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return zeroPadLeft(hex, width / 8);
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*/
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}
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toUnsafeFloat() { return parseFloat(this.toString()); }
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toFormat(format) {
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return FixedNumber.fromString(this.#value, format);
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}
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static fromValue(value, decimals = 0, format = "fixed") {
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return FixedNumber.fromString(formatFixed(value, decimals), FixedFormat.from(format));
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}
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static fromString(value, format = "fixed") {
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const fixedFormat = FixedFormat.from(format);
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const numeric = parseFixed(value, fixedFormat.decimals);
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if (!fixedFormat.signed && numeric < 0) {
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throwFault("unsigned value cannot be negative", "overflow", "value", value);
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}
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const hex = (function () {
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if (fixedFormat.signed) {
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return (0, maths_js_1.toHex)((0, maths_js_1.toTwos)(numeric, fixedFormat.width));
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}
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return (0, maths_js_1.toHex)(numeric, fixedFormat.width / 8);
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})();
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const decimal = formatFixed(numeric, fixedFormat.decimals);
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return new FixedNumber(_guard, hex, decimal, fixedFormat);
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}
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static fromBytes(_value, format = "fixed") {
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const value = (0, data_js_1.getBytes)(_value, "value");
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const fixedFormat = FixedFormat.from(format);
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if (value.length > fixedFormat.width / 8) {
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throw new Error("overflow");
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}
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let numeric = (0, maths_js_1.toBigInt)(value);
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if (fixedFormat.signed) {
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numeric = (0, maths_js_1.fromTwos)(numeric, fixedFormat.width);
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}
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const hex = (0, maths_js_1.toHex)((0, maths_js_1.toTwos)(numeric, (fixedFormat.signed ? 0 : 1) + fixedFormat.width));
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const decimal = formatFixed(numeric, fixedFormat.decimals);
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return new FixedNumber(_guard, hex, decimal, fixedFormat);
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}
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static from(value, format) {
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if (typeof (value) === "string") {
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return FixedNumber.fromString(value, format);
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}
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if (value instanceof Uint8Array) {
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return FixedNumber.fromBytes(value, format);
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}
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try {
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return FixedNumber.fromValue(value, 0, format);
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}
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catch (error) {
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// Allow NUMERIC_FAULT to bubble up
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if (error.code !== "INVALID_ARGUMENT") {
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throw error;
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}
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}
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(0, errors_js_1.assertArgument)(false, "invalid FixedNumber value", "value", value);
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}
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static isFixedNumber(value) {
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return !!(value && value._isFixedNumber);
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}
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}
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exports.FixedNumber = FixedNumber;
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const ONE = FixedNumber.from(1);
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const BUMP = FixedNumber.from("0.5");
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//# sourceMappingURL=fixednumber.js.map
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