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