messageformat/lib/resolve/resolve-expression.js

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

import { string } from "../functions/string.js";
import { MessageFunctionContext } from "./function-context.js";
import { resolveFunctionRef } from "./resolve-function-ref.js";
import { resolveVariableRef } from "./resolve-variable.js";
export function resolveExpression(ctx, { arg, functionRef }) {
    if (functionRef) {
        return resolveFunctionRef(ctx, arg, functionRef);
    }
    switch (arg?.type) {
        case 'literal': {
            const source = `|${arg.value}|`;
            const msgCtx = new MessageFunctionContext(ctx, source);
            const msgStr = string(msgCtx, {}, arg.value);
            msgStr.source = source;
            return msgStr;
        }
        case 'variable':
            return resolveVariableRef(ctx, arg);
        default:
            // @ts-expect-error - should never happen
            throw new Error(`Unsupported expression: ${arg?.type}`);
    }
}