import { ObjectWrappingMap, PartitionedMap } from './map.js'

/**

* Create a new scope which can access the parent scope,

* but does not affect it when written. This is suitable for variable definitions

* within a block node, or function definition.

*

* If parent scope has a createSubScope method, it delegates to that. Otherwise,

* creates an empty map, and copies the parent scope to it, adding in

* the remaining `args`.

*

* @param {Map} parentScope

* @param {Object} args

* @returns {PartitionedMap}

*/

export function createSubScope (parentScope, args) {

return new PartitionedMap(

parentScope,

new ObjectWrappingMap(args),

new Set(Object.keys(args))

)

}