convert
Version:
The smallest & fastest library for really easy, totally type-safe unit conversions in TypeScript & JavaScript
97 lines • 15.7 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.convert = convert;
const best_units_1 = require("../generated/best-units.cjs");
const parse_unit_1 = require("../generated/parse-unit.cjs");
// Importing MeasureKind will cause the entire enum to be included in the output, which increases bundle size
// This workaround allows me to just hardcode the value, but ensures it doesn't become inaccurate if the enum changes
const MeasureKindTime = 14;
function convertTo(from, quantity, to) {
let parsedTo = parse_unit_1.unitsObject[to];
if (!parsedTo) {
throw new RangeError(`${to} is not a valid unit`);
}
let parsedFrom = parse_unit_1.unitsObject[from];
if (parsedFrom[0] !== parsedTo[0]) {
if (parsedFrom[0] === MeasureKindTime && to === 'm') {
// Going from time to meters, you meant to do minutes
parsedTo = parse_unit_1.unitsObject.min;
}
else if (from === 'm' && parsedTo[0] === MeasureKindTime) {
parsedFrom = parse_unit_1.unitsObject.min;
}
else {
throw new RangeError(`Cannot convert between different measures: ${from} and ${to}`);
}
}
const fromRatio = parsedFrom[1];
const toRatio = parsedTo[1];
if (typeof quantity === 'bigint') {
if ((from in parse_unit_1.differences || to in parse_unit_1.differences) &&
parse_unit_1.differences[from] !== parse_unit_1.differences[to]) {
throw new RangeError(`Conversion for ${from} to ${to} cannot be calculated as one of the units has a conversion difference which cannot be expressed with bigints`);
}
return ((quantity * BigInt(fromRatio)) / BigInt(toRatio));
}
if (from in parse_unit_1.differences) {
if (to in parse_unit_1.differences) {
return ((quantity + parse_unit_1.differences[from]) * (fromRatio / toRatio) -
parse_unit_1.differences[to]);
}
return ((quantity + parse_unit_1.differences[from]) *
(fromRatio / toRatio));
}
if (to in parse_unit_1.differences) {
return (quantity * (fromRatio / toRatio) - parse_unit_1.differences[to]);
}
return (quantity * (fromRatio / toRatio));
}
function convertToBest(quantity, from, kind) {
const fromMeasure = parse_unit_1.unitsObject[from][0];
const best = best_units_1.bestUnits[kind === 'imperial' ? 1 : 0][fromMeasure];
const smallestUnit = best[0][0];
let bestUnit = smallestUnit;
const baseQuantity = convertTo(from, quantity, smallestUnit);
const absQuantity = baseQuantity < 0 ? -baseQuantity : baseQuantity;
for (let i = 0; i < best.length; i++) {
// biome-ignore lint/style/noNonNullAssertion: This is safe because we know the best array is not empty
const bestEntry = best[i];
if (absQuantity >= bestEntry[1]) {
bestUnit = bestEntry[0];
}
else {
break;
}
}
const result = convertTo(from, quantity, bestUnit);
return {
quantity: result,
unit: bestUnit,
toString: (toFixed) => `${typeof result === 'bigint' || toFixed === undefined ? result : result.toFixed(toFixed)} ${bestUnit}`,
};
}
function convertToAny(to, kind) {
if (to === 'best') {
return convertToBest(this._quantity, this._from, kind ?? 'metric');
}
return convertTo(this._from, this._quantity, to);
}
/**
* Convert a given quantity of a unit into another unit.
*
* @param quantity - The quantity of the `from` unit you want to convert
* @param from - The unit you are converting from
*
* @returns An object you can use to convert the provided quantity
*
* @public
*/
function convert(quantity, from) {
if (!(from in parse_unit_1.unitsObject)) {
throw new RangeError(`${from} is not a valid unit`);
}
return {
to: convertToAny.bind({ _quantity: quantity, _from: from }),
};
}
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type { BestKind, MeasureKind } from '../conversions/types';\nimport { bestUnits } from '../generated/best-units';\nimport { differences, unitsObject } from '../generated/parse-unit';\nimport type { BestConversion, Converter } from '../types/converter';\nimport type { BestUnitsForUnit, MeasuresByUnit, Unit } from '../types/units';\nimport type { LiteralToPrimitive } from '../types/utils';\n\n// Importing MeasureKind will cause the entire enum to be included in the output, which increases bundle size\n// This workaround allows me to just hardcode the value, but ensures it doesn't become inaccurate if the enum changes\nconst MeasureKindTime: MeasureKind.Time = 14;\n\nfunction convertTo<Q extends number | bigint>(from: string, quantity: Q, to: string): LiteralToPrimitive<Q> {\n\tlet parsedTo = unitsObject[to as Unit];\n\n\tif (!parsedTo) {\n\t\tthrow new RangeError(`${to} is not a valid unit`);\n\t}\n\n\tlet parsedFrom = unitsObject[from as Unit];\n\n\tif (parsedFrom[0] !== parsedTo[0]) {\n\t\tif (parsedFrom[0] === MeasureKindTime && to === 'm') {\n\t\t\t// Going from time to meters, you meant to do minutes\n\t\t\tparsedTo = unitsObject.min;\n\t\t} else if (from === 'm' && parsedTo[0] === MeasureKindTime) {\n\t\t\tparsedFrom = unitsObject.min;\n\t\t} else {\n\t\t\tthrow new RangeError(`Cannot convert between different measures: ${from} and ${to}`);\n\t\t}\n\t}\n\n\tconst fromRatio = parsedFrom[1];\n\tconst toRatio = parsedTo[1];\n\n\tif (typeof quantity === 'bigint') {\n\t\tif (\n\t\t\t(from in differences || to in differences) &&\n\t\t\tdifferences[from as keyof typeof differences] !== differences[to as keyof typeof differences]\n\t\t) {\n\t\t\tthrow new RangeError(\n\t\t\t\t`Conversion for ${from} to ${to} cannot be calculated as one of the units has a conversion difference which cannot be expressed with bigints`,\n\t\t\t);\n\t\t}\n\n\t\treturn ((quantity * BigInt(fromRatio)) / BigInt(toRatio)) as LiteralToPrimitive<Q>;\n\t}\n\n\tif (from in differences) {\n\t\tif (to in differences) {\n\t\t\treturn (((quantity as number) + differences[from as keyof typeof differences]) * (fromRatio / toRatio) -\n\t\t\t\tdifferences[to as keyof typeof differences]) as LiteralToPrimitive<Q>;\n\t\t}\n\n\t\treturn (((quantity as number) + differences[from as keyof typeof differences]) *\n\t\t\t(fromRatio / toRatio)) as LiteralToPrimitive<Q>;\n\t}\n\n\tif (to in differences) {\n\t\treturn (quantity * (fromRatio / toRatio) - differences[to as keyof typeof differences]) as LiteralToPrimitive<Q>;\n\t}\n\n\treturn (quantity * (fromRatio / toRatio)) as LiteralToPrimitive<Q>;\n}\n\nfunction convertToBest<Q extends number | bigint, U extends Unit>(\n\tquantity: Q,\n\tfrom: U,\n\tkind: BestKind,\n): BestConversion<Q, BestUnitsForUnit<U>> {\n\tconst fromMeasure = unitsObject[from][0];\n\tconst best = bestUnits[kind === 'imperial' ? 1 : 0][fromMeasure];\n\n\tconst smallestUnit = best[0][0];\n\n\tlet bestUnit = smallestUnit as BestUnitsForUnit<U>;\n\n\tconst baseQuantity = convertTo(from, quantity, smallestUnit);\n\tconst absQuantity = baseQuantity < 0 ? -baseQuantity : baseQuantity;\n\n\tfor (let i = 0; i < best.length; i++) {\n\t\t// biome-ignore lint/style/noNonNullAssertion: This is safe because we know the best array is not empty\n\t\tconst bestEntry = best[i]!;\n\n\t\tif (absQuantity >= bestEntry[1]) {\n\t\t\tbestUnit = bestEntry[0] as BestUnitsForUnit<U>;\n\t\t} else {\n\t\t\tbreak;\n\t\t}\n\t}\n\n\tconst result = convertTo(from, quantity, bestUnit);\n\n\treturn {\n\t\tquantity: result,\n\t\tunit: bestUnit,\n\t\ttoString: (toFixed?: number) =>\n\t\t\t`${typeof result === 'bigint' || toFixed === undefined ? result : result.toFixed(toFixed)} ${bestUnit}` as `${LiteralToPrimitive<Q>} ${BestUnitsForUnit<U>}`,\n\t};\n}\n\ntype ConverterThis<Q extends number | bigint, U extends Unit> = {\n\t_quantity: Q;\n\t_from: U;\n};\n\nfunction convertToAny<Q extends number | bigint, U extends Unit>(\n\tthis: ConverterThis<Q, U>,\n\tto: MeasuresByUnit<U>,\n): LiteralToPrimitive<Q>;\nfunction convertToAny<Q extends number | bigint, U extends Unit, K extends BestKind = 'metric'>(\n\tthis: ConverterThis<Q, U>,\n\tto: 'best',\n\tkind?: K | undefined,\n): BestConversion<Q, BestUnitsForUnit<U>>;\nfunction convertToAny<Q extends number | bigint, U extends Unit, K extends BestKind = 'metric'>(\n\tthis: ConverterThis<Q, U>,\n\tto: MeasuresByUnit<U> | 'best',\n\tkind?: K | undefined,\n): LiteralToPrimitive<Q> | BestConversion<Q, BestUnitsForUnit<U>> {\n\tif (to === 'best') {\n\t\treturn convertToBest(this._quantity, this._from, kind ?? 'metric');\n\t}\n\n\treturn convertTo(this._from, this._quantity, to);\n}\n\n/**\n * Convert a given quantity of a unit into another unit.\n *\n * @param quantity - The quantity of the `from` unit you want to convert\n * @param from - The unit you are converting from\n *\n * @returns An object you can use to convert the provided quantity\n *\n * @public\n */\nexport function convert<Q extends number | bigint, U extends Unit>(\n\tquantity: Q,\n\tfrom: U,\n): Converter<Q, MeasuresByUnit<U>> {\n\tif (!(from in unitsObject)) {\n\t\tthrow new RangeError(`${from} is not a valid unit`);\n\t}\n\n\treturn {\n\t\tto: convertToAny.bind({ _quantity: quantity, _from: from }),\n\t} as Converter<Q, MeasuresByUnit<U>>;\n}\n"]}