@bespunky/angular-zen/esm2020/utils/access-object.mjs

The Angular tools you always wished were there.

function isArrayIndexer(path) {
    const numericIndexerRegex = /^\w+\[\d+\]$/;
    return numericIndexerRegex.test(path);
}
function accessArrayProperty(value, arrayPath) {
    if (!value)
        throw new Error(`Cannot access ${arrayPath}. 'value' is ${value}`);
    if (typeof value !== 'object')
        throw new Error(`Cannot access ${arrayPath}. ${value} is not an object.`);
    const pathRegex = /^(?<property>(\w+))\[(?<index>(\d+))\]$/;
    const lookup = pathRegex.exec(arrayPath)?.groups;
    if (!(lookup && lookup['property'] && lookup['index']))
        throw new Error(`
            Tried to access array on at '${arrayPath}', but the path is invalid.
            Expected a path of the shape 'propertyName[index].'
        `);
    const { property, index } = lookup;
    const array = value[property];
    if (!Array.isArray(array))
        throw new TypeError(`Array property access failed. Value at '${property}' is not an array.`);
    return {
        get: () => array[+index],
        set: (newValue) => array[+index] = newValue
    };
}
export function access(value, path) {
    if (!path)
        return { get: () => value, set: () => void 0 };
    const parts = path.split('.').filter(part => part !== '');
    while (parts.length > 1) {
        const nextPath = parts.shift();
        if (typeof value !== 'object')
            throw new Error(``);
        value = (isArrayIndexer(nextPath) ? accessArrayProperty(value, nextPath).get() : value[nextPath]);
    }
    const lastPath = parts.shift();
    return {
        get: isArrayIndexer(lastPath)
            ? () => accessArrayProperty(value, lastPath).get()
            : () => value[lastPath],
        set: isArrayIndexer(lastPath)
            ? (newValue) => accessArrayProperty(value, lastPath).set(newValue)
            : (newValue) => value[lastPath] = newValue
    };
}
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