/*
 * EliasDB
 *
 * Copyright 2016 Matthias Ladkau. All rights reserved.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

/*
Package interpreter contains the ECAL interpreter.
*/
package interpreter

import (
	"sync"

	"devt.de/krotik/common/lang/ecal/parser"
)

// TODO: Scope with value buckets which can be read only - auto provide access to parent scopes

/*
DataBucket models a storage bucket for data.
*/
type DataBucket struct {
	data     interface{} // Data of this bucket
	canWrite bool        // Flag if data can be written to this bucket
}

/*
Scope models an ECAL scope. It is used to store variable data.
*/
type Scope struct {
	name    string                 // Name of the scope
	parent  *Scope                 // Parent scope
	storage map[string]*DataBucket // Storage for variables
	lock    sync.RWMutex           // Lock for this scope
}

/*
NewChild creates a new child scope.
*/
func (s *Scope) NewChild(name string) parser.VarsScope {
	return nil
}

/*
SetValue sets a new value for a variable.
*/
func (s *Scope) SetValue(varName string, varValue interface{}) error {
	return nil
}

/*
GetValue gets the current value of a variable.
*/
func (s *Scope) GetValue(varName string) (interface{}, bool, error) {
	return nil, false, nil
}

/*
String returns a string representation of this variable scope.
*/
func (s *Scope) String() string {
	return ""
}