@messageformat/icu-messageformat-1/lib/validate.js

Compile ICU MessageFormat 1 sources into MessageFormat 2 formatters

import { MessageError, visit } from 'messageformat';
import { DefaultFunctions } from 'messageformat/functions';
import { MF1Functions } from "./functions.js";
/**
 * Ensure that the `msg` data model does not contain any unsupported MF1 argType or argStyle references,
 * calling `onError` on errors.
 * If `onError` is not defined, a {@link MessageError} will be thrown on error.
 */
export function mf1Validate(msg, onError = (type, expr) => {
    const argTypeAttr = expr.attributes?.get('mf1:argType');
    const argType = argTypeAttr && argTypeAttr !== true
        ? argTypeAttr.value
        : expr.functionRef.name.replace('mf1:', '');
    if (type === 'unknown-function') {
        throw new MessageError(type, `Unsupported MF1 argType: ${argType}`);
    }
    else {
        const opt = expr.functionRef.options.get('mf1:argStyle');
        const argStyle = opt?.type === 'literal' ? opt.value : '�';
        throw new MessageError(type, `Unsupported MF1 ${argType} argStyle: ${argStyle}`);
    }
}) {
    visit(msg, {
        expression(expr) {
            if (expr.functionRef) {
                const name = expr.functionRef.name;
                if (!(name in DefaultFunctions) && !(name in MF1Functions)) {
                    onError('unknown-function', expr);
                }
                if (expr.functionRef.options?.has('mf1:argStyle')) {
                    onError('unsupported-operation', expr);
                }
            }
        }
    });
}