// Copyright 2025 Google LLC
//
// 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.
/**
* Escapes special characters for safe rendering in HTML text contexts.
*
* This utility encodes user-controlled values to avoid unintended script
* execution when rendering content as HTML. It is intended as a defensive
* measure and does not perform HTML sanitization.
*
* @param {*} input The value to escape.
* @return {string} The escaped string safe for HTML rendering.
*/
const htmlEscapes = {
'&': '&',
'<': '<',
'>': '>',
'"': '"',
"'": ''',
'`': '`'
};
const escapeCharsRegex = /[&<>"'`]/g;
export function escapeHtml(input) {
if (input === null || input === undefined) {
return '';
}
const str = String(input);
return str.replace(escapeCharsRegex, (char) => htmlEscapes[char]);
}
