Add the let statments data store.

classdef LetStatments < handle

    %LETSTATMENTS Summary of this class goes here

    %   Detailed explanation goes here

    properties(Access = private)

        statements = {}

    end

    methods

        function object = LetStatments()

        end

        function count = size(object)

            count = size(object.statements, 2);

        end

        function [name, assignment] = get_statement(object, index)

            name = object.statements{index}.name;

            assignment = object.statements{index}.assignment;

        end

        function insert_space(object)

            p = struct();

            p.name = '';

            p.assignment = '';

            object.statements(size(object.statements, 2)+1) = {p};

            notify(object, 'StructureChanged');

        end

        function delete_end(object)

            object.statements(size(object.statements, 2)) = [];

            notify(object, 'StructureChanged');

        end

        function set_statement_name(object, index, name)

            object.statements{index}.name = name;

        end

        function set_statement_assignment(object, index, assignment)

            object.statements{index}.assignment = assignment;

        end

    end

    events

        StructureChanged

    end

end