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

// operand-selector-case.go
package expr

import "fmt"

// -------- selector case term

type selectorCase struct {
	filterList *term
	caseExpr   Expr
}

func newSelectorCaseTerm(row, col int, filterList *term, caseExpr Expr) *term {
	tk := NewValueToken(row, col, SymSelectorCase, "", &selectorCase{filterList: filterList, caseExpr: caseExpr})
	return &term{
		tk:       *tk,
		class:    classVar,
		kind:     kindUnknown,
		parent:   nil,
		children: nil,
		position: posLeaf,
		priority: priValue,
		evalFunc: evalSelectorCase,
	}
}

// -------- eval selector case
func evalSelectorCase(ctx ExprContext, self *term) (v any, err error) {
	var ok bool
	if v, ok = self.value().(*selectorCase); !ok {
		err = fmt.Errorf("selector-case expected, got %T", self.value())
	}
	return
}