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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { type VariableSchema, VARIABLE_SCHEMA } from './variableSchema.js';
export type JsonObject = { [key: string]: JsonValue };
export type JsonArray = JsonValue[];
export type JsonValue =
| string
| number
| boolean
| null
| JsonObject
| JsonArray;
export type VariableContext = {
[key in keyof typeof VARIABLE_SCHEMA]?: string;
};
export function validateVariables(
variables: VariableContext,
schema: VariableSchema,
) {
for (const key in schema) {
const definition = schema[key];
if (definition.required && !variables[key as keyof VariableContext]) {
throw new Error(`Missing required variable: ${key}`);
}
}
}
export function hydrateString(str: string, context: VariableContext): string {
validateVariables(context, VARIABLE_SCHEMA);
const regex = /\${(.*?)}/g;
return str.replace(regex, (match, key) =>
context[key as keyof VariableContext] == null
? match
: (context[key as keyof VariableContext] as string),
);
}
export function recursivelyHydrateStrings(
obj: JsonValue,
values: VariableContext,
): JsonValue {
if (typeof obj === 'string') {
return hydrateString(obj, values);
}
if (Array.isArray(obj)) {
return obj.map((item) => recursivelyHydrateStrings(item, values));
}
if (typeof obj === 'object' && obj !== null) {
const newObj: JsonObject = {};
for (const key in obj) {
if (Object.prototype.hasOwnProperty.call(obj, key)) {
newObj[key] = recursivelyHydrateStrings(obj[key], values);
}
}
return newObj;
}
return obj;
}
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