export type SearchGrammarType = Expression

type Expression = OrQuery | AndQuery | Hierarchy | DeepHierarchy | Tag

interface AndQuery {
	type: 'AND'
	parts: Expression[] // Parts is an array of Expressions due to the recursive nature of AndQuery in your grammar
}

interface Tag {
	type: 'TAG'
	symbol: string
	name: string
}

interface OrQuery {
	type: 'OR'
	parts: Expression[] // Changed to an array of exactly two expressions, since OR is binary
}

interface Hierarchy {
	type: 'HIERARCHY'
	parent: Expression // Parent can be any Expression (including another Hierarchy)
	child: Expression // Child can be any Expression (including another Hierarchy)
}
interface DeepHierarchy {
	type: 'DEEP_HIERARCHY'
	parent: Expression // Parent can be any Expression (including another Hierarchy)
	child: Expression // Child can be any Expression (including another Hierarchy)
}