messageformat/lib/functions/currency.js

Intl.MessageFormat / Unicode MessageFormat 2 parser, runtime and polyfill

import { MessageFunctionError } from "../errors.js";
import { getMessageNumber, readNumericOperand } from "./number.js";
import { asPositiveInteger, asString } from "./utils.js";
/**
 * `currency` accepts as input numerical values as well as
 * objects wrapping a numerical value that also include a `currency` property.
 *
 * @beta
 */
export function currency(ctx, exprOpt, operand) {
    const input = readNumericOperand(operand);
    const options = Object.assign({}, input.options, {
        localeMatcher: ctx.localeMatcher,
        style: 'currency'
    });
    for (const [name, optval] of Object.entries(exprOpt)) {
        if (optval === undefined)
            continue;
        try {
            switch (name) {
                case 'currency':
                case 'currencySign':
                case 'roundingMode':
                case 'roundingPriority':
                case 'trailingZeroDisplay':
                case 'useGrouping':
                    // @ts-expect-error Let Intl.NumberFormat construction fail
                    options[name] = asString(optval);
                    break;
                case 'minimumIntegerDigits':
                case 'minimumSignificantDigits':
                case 'maximumSignificantDigits':
                case 'roundingIncrement':
                    // @ts-expect-error TS types don't know about roundingIncrement
                    options[name] = asPositiveInteger(optval);
                    break;
                case 'currencyDisplay': {
                    const strval = asString(optval);
                    if (strval === 'never') {
                        ctx.onError('unsupported-operation', 'Currency display "never" is not yet supported');
                    }
                    else {
                        // @ts-expect-error Let Intl.NumberFormat construction fail
                        options[name] = strval;
                    }
                    break;
                }
                case 'fractionDigits': {
                    const strval = asString(optval);
                    if (strval === 'auto') {
                        options.minimumFractionDigits = undefined;
                        options.maximumFractionDigits = undefined;
                    }
                    else {
                        const numval = asPositiveInteger(strval);
                        options.minimumFractionDigits = numval;
                        options.maximumFractionDigits = numval;
                    }
                    break;
                }
            }
        }
        catch {
            ctx.onError('bad-option', `Value ${optval} is not valid for :currency option ${name}`);
        }
    }
    if (!options.currency) {
        throw new MessageFunctionError('bad-operand', 'A currency code is required for :currency');
    }
    return getMessageNumber(ctx, input.value, options, false);
}