// Switch to Mata interpreter/compiler
mata:

// Drops class object if it already exists
// mata drop optgroup()

// Definition of HTML Tag optgroup Mata Class
// Defines a group of related options in a drop-down list// Information retrieved from http://www.w3schools.com/tags/tag_optgroup.asp
class optgroup extends htmlglobal {

    // Define private member variables
    private:

    // Static/final variables
    static       string  scalar  opens, opene, close

    // String scalar attributes
    string               scalar          htmldisabled, htmllabel

    // Make class args non-static to prevent assignment of class args to all instances of class
    string               scalar          classargs

    // Define public members/methods
    public:

    // Class constructor method
    void         new()

    // Setter methods
    class        optgroup     scalar  setClassArgs(), setDisabled(), setLabel()

    // Getter methods
    string               scalar          getOpens(), getOpene(), getClose(), print(), getClassArgs(), getDisabled(), getLabel()

} // End of class declaration

// Class constructor method declaration
void optgroup::new() {

    // Defines the start of the opening tag for the class
    this.opens = "<optgroup"

    // Defines the end of the opening tag for the class
    this.opene = ">"

    // Defines the closing tag for the class
    this.close = "</optgroup>"

} // End of class constructor method definition

// Setter method for class arguments (appear between HTML tags)
class optgroup scalar optgroup::setClassArgs(| string scalar classarguments) {

    // Defines arguments that appear between HTML tags
    this.classargs = classarguments

    // Return a copy of the object
    return(this)

} // End of setter method for class arguments

// Specifies that an option-group should be disabled
class optgroup scalar optgroup::setDisabled(| string scalar methodarg) {

    // Set the attribute disabled for this class
    this.htmldisabled = `" disabled=""' + methodarg + `"""'

    // Return a copy of the object
    return(this)

} // End of Method disabled declaration for class optgroup

// Specifies a label for an option-group
class optgroup scalar optgroup::setLabel(| string scalar methodarg) {

    // Set the attribute label for this class
    this.htmllabel = `" label=""' + methodarg + `"""'

    // Return a copy of the object
    return(this)

} // End of Method label declaration for class optgroup

// Getter method for opening bracket
string scalar optgroup::getOpens() {

    // Returns the opening bracket/tag w/o > character to allow attributes
    return(this.opens)

} // End of getter method for opens member of class optgroup

// Getter method for opening bracket closing character
string scalar optgroup::getOpene() {

    // Returns the closing character for the opening bracket
    return(this.opene)

} // End of getter method for opene member of class optgroup

// Getter method for closing bracket
string scalar optgroup::getClose() {

    // Returns the closing bracket/tag
    return(this.close)

} // End of getter method for close member of class optgroup

// Getter method for class arguments
string scalar optgroup::getClassArgs() {

    // Returns the class arguments that appear between the HTML tags
    return(this.classargs)

} // End of getter method for class arguments member of class optgroup

// Getter method for disabled member variable
string scalar optgroup::getDisabled() {

    // Returns the disabled variable
    return(this.htmldisabled)

} // End of getter method for disabled member of class optgroup

// Getter method for label member variable
string scalar optgroup::getLabel() {

    // Returns the label variable
    return(this.htmllabel)

} // End of getter method for label member of class optgroup

// Get the HTML tag w/attributes and arguments
string scalar optgroup::print() {

    // Create local variables to piece together return string
    string scalar open, args, close

    // Create opening string
    open = getOpens() + getDisabled() + getLabel() + globalAttrs() + getOpene()

    // Get class arguments
    args = getClassArgs()

    // Get closing tag
    close = getClose()

    // Return the complete HTML string
    return(char((10)) + subinstr(open, " >", ">") + args + close + char((10)))

} // End of print method for class optgroup

// End of Mata session
end