@bufbuild/cel/dist/esm/eval.js

A CEL evaluator for ECMAScript

// Copyright 2024-2025 Buf Technologies, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
const contextStack = [];
/**
 * Sets the EvalContext for the current execution scope.
 */
export function setEvalContext(context) {
    contextStack.push(context);
    return () => contextStack.pop();
}
/**
 * Gets the current EvalContext.
 *
 * Throws an error if there isn't one.
 */
export function getEvalContext() {
    if (contextStack.length === 0) {
        throw new Error("cannot use `getEvalContext` outside of an evaluation");
    }
    return contextStack[contextStack.length - 1];
}
/**
 * Returns an Interpretable that sets the context for the given call.
 */
export function withEvalContext(context, next) {
    return {
        id: next.id,
        eval(ctx) {
            const unset = setEvalContext(context);
            try {
                return next.eval(ctx);
            }
            finally {
                unset();
            }
        },
    };
}
/**
 * Returns a message descriptor with the matching type name
 * from the evaluation context.
 */
export function getMsgDesc(typeName) {
    const schema = getEvalContext().registry.getMessage(typeName);
    if (!schema) {
        throw new Error(`Message ${typeName} not found in registry`);
    }
    return schema;
}