// Copyright (c) 2024 Celestino Amoroso (celestino.amoroso@gmail.com).
// All rights reserved.

// operator-in.go
package expr

//-------- in term

func newInTerm(tk *Token) (inst *term) {
	return &term{
		tk:       *tk,
		children: make([]*term, 0, 2),
		position: posInfix,
		priority: priRelational,
		evalFunc: evalIn,
	}
}

func hasKey(d map[any]any, target any) (ok bool) {
	_, ok = d[target]
	return
}

func evalIn(ctx ExprContext, self *term) (v any, err error) {
	var leftValue, rightValue any

	if leftValue, rightValue, err = self.evalInfix(ctx); err != nil {
		return
	}

	if IsList(rightValue) {
		list, _ := rightValue.(*ListType)
		v = list.indexDeepCmp(leftValue) >= 0
	} else if IsDict(rightValue) {
		d, _ := rightValue.(map[any]any)
		v = hasKey(d, leftValue)
	} else {
		err = self.errIncompatibleTypes(leftValue, rightValue)
	}
	return
}

// init
func init() {
	registerTermConstructor(SymKwIn, newInTerm)
}