hierarchical off links in mol

link.ts

namespace $.$$ {

	export class $gd_kit_link extends $.$gd_kit_link {
		make_uri(args: ReturnType<typeof this.arg>) {
			const dict = this.$.$mol_state_arg.dict()
			const href_args = { ...dict, ...args }

			return this.$.$mol_state_arg.make_link( href_args )
		}

		@ $mol_mem
		uri() {
			return this.make_uri(this.arg())
		}

		@ $mol_mem
		current() {
			const current = super.current()

			if (current) this.$.$gd_kit_page_current?.link_add(this)
			else this.$.$gd_kit_page_current?.link_delete(this)

			return current
		}

		override destructor() {
			this.$.$gd_kit_page_current?.link_delete(this)
		}

		arg_off_self() {
			const result = { ... this.arg() }
			for (let key in result) result[key] = null

			return result
		}

		arg_off() {
			return {
				...this.$.$gd_kit_page_current?.args_off(),
				...this.arg_off_self()
			}
		}

		@ $mol_mem
		uri_off() {
			return this.make_uri(this.arg_off())
		}
	}
}

page.ts

namespace $.$$ {
	export const $gd_kit_page_current = undefined as undefined | $gd_kit_page

	/*
	Switch $mol_page to $gd_kit_page via context
	@example
	```ts
	class $my_app extends $.$my_app {
		@ $mol_memo.field
		get $() {
			return super.$.$mol_ambient({
				$mol_page: $gd_kit_page,
				$mol_link: $mol_link,
			})
		}
	```
	*/
	export class $gd_kit_page extends $.$gd_kit_page {
		protected kids = [] as $gd_kit_page[]
		protected links = [] as $mol_link[]

		@ $mol_memo.field
		get $() {
			super.$.$gd_kit_page_current?.kids.push(this)

			return super.$.$mol_ambient({
				$gd_kit_page_current: this
			})
		}

		destructor() {
			const parent = super.$.$gd_kit_page_current
			if (! parent) return
			parent.kids = parent.kids.filter(kid => kid !== this)
		}

		link_add(link: $mol_link) {
			this.links.push(link)
		}

		link_delete(link: $mol_link) {
			this.links = this.links.filter(obj => obj !== link)
		}
		
		@ $mol_mem
		args_off() {
			const result = {} as Record<string, null>

			for (const kid of this.kids) Object.assign(result, kid.args_off())
			for (const link of this.links) {
				for (const key of Object.keys(link.arg())) {
					result[key] = null
				}
			}

			return result
		}
	}
}