messageformat/lib/functions/percent.js

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

import { getMessageNumber, readNumericOperand } from "./number.js";
import { asPositiveInteger, asString } from "./utils.js";
/**
 * The function `:percent` is a selector and formatter for percent values.
 *
 * @beta
 */
export function percent(ctx, exprOpt, operand) {
    const input = readNumericOperand(operand);
    const options = Object.assign({}, input.options, {
        localeMatcher: ctx.localeMatcher,
        style: 'percent'
    });
    for (const [name, optval] of Object.entries(exprOpt)) {
        if (optval === undefined)
            continue;
        try {
            switch (name) {
                case 'roundingMode':
                case 'roundingPriority':
                case 'signDisplay':
                case 'trailingZeroDisplay':
                case 'useGrouping':
                    // @ts-expect-error Let Intl.NumberFormat construction fail
                    options[name] = asString(optval);
                    break;
                case 'minimumFractionDigits':
                case 'maximumFractionDigits':
                case 'minimumSignificantDigits':
                case 'maximumSignificantDigits':
                    options[name] = asPositiveInteger(optval);
                    break;
            }
        }
        catch {
            ctx.onError('bad-option', `Value ${optval} is not valid for :percent option ${name}`);
        }
    }
    return getMessageNumber(ctx, input.value, options, true);
}