messageformat/lib/resolve/resolve-function-ref.js

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

import { MessageError } from "../errors.js";
import { fallback } from "../functions/fallback.js";
import { BIDI_ISOLATE } from "../message-value.js";
import { MessageFunctionContext } from "./function-context.js";
import { getValueSource, resolveValue } from "./resolve-value.js";
export function resolveFunctionRef(ctx, operand, { name, options }) {
    const source = getValueSource(operand) ?? `:${name}`;
    try {
        const fnInput = operand ? [resolveValue(ctx, operand)] : [];
        const rf = ctx.functions[name];
        if (!rf) {
            throw new MessageError('unknown-function', `Unknown function :${name}`);
        }
        const msgCtx = new MessageFunctionContext(ctx, source, options);
        const opt = resolveOptions(ctx, options);
        let res = rf(msgCtx, opt, ...fnInput);
        if (res === null ||
            (typeof res !== 'object' && typeof res !== 'function') ||
            typeof res.type !== 'string' ||
            typeof res.source !== 'string') {
            throw new MessageError('bad-function-result', `Function :${name} did not return a MessageValue`);
        }
        if (msgCtx.dir)
            res = { ...res, dir: msgCtx.dir, [BIDI_ISOLATE]: true };
        if (msgCtx.id && typeof res.toParts === 'function') {
            return {
                ...res,
                toParts() {
                    const parts = res.toParts();
                    for (const part of parts)
                        part.id = msgCtx.id;
                    return parts;
                }
            };
        }
        return res;
    }
    catch (error) {
        ctx.onError(error);
        return fallback(source);
    }
}
function resolveOptions(ctx, options) {
    const opt = Object.create(null);
    if (options) {
        for (const [name, value] of options) {
            if (!name.startsWith('u:'))
                opt[name] = resolveValue(ctx, value);
        }
    }
    return opt;
}