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

// operand-expr.go
package expr

import (
	"fmt"

	"git.portale-stac.it/go-pkg/expr/kern"
)

// -------- expr term
func newExprTerm(root *term) *term {
	tk := NewValueToken(root.tk.row, root.tk.col, SymExpression, root.Source(), root)
	return &term{
		tk:       *tk,
		parent:   nil,
		children: nil,
		position: posLeaf,
		priority: priValue,
		evalFunc: evalExpr,
	}
}

// -------- eval expr
func evalExpr(ctx kern.ExprContext, opTerm *term) (v any, err error) {
	if ast, ok := opTerm.value().(*term); ok {
		v, err = ast.Compute(ctx)
	} else {
		err = fmt.Errorf("expression expected, got %T", opTerm.value())
	}
	return
}