// Switch to Mata interpreter/compiler
mata:

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

// Definition of HTML Tag track Mata Class
// Defines text tracks for media elements (<video> and <audio>)// Information retrieved from http://www.w3schools.com/tags/tag_track.asp
class track extends htmlglobal {

    // Define private member variables
    private:

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

    // String scalar attributes
    string               scalar          htmldefault, htmlkind, htmllabel, htmlsrc, htmlsrclang

    // 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        track     scalar  setClassArgs(), setDefault(), setKind(), setLabel(), setSrc(), setSrclang()

    // Getter methods
    string               scalar          getOpens(), getOpene(), getClose(), print(), getClassArgs(), getDefault(), getKind(), getLabel(), getSrc(), getSrclang()

} // End of class declaration

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

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

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

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

} // End of class constructor method definition

// Setter method for class arguments (appear between HTML tags)
class track scalar track::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 the track is to be enabled if the user's preferences do not indicate that another track would be more appropriate
class track scalar track::setDefault(| string scalar methodarg) {

    // Set the attribute default for this class
    this.htmldefault = `" default=""' + methodarg + `"""'

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

} // End of Method default declaration for class track

// Specifies the kind of text track
class track scalar track::setKind(| string scalar methodarg) {

    // Validate argument
    if (methodarg == "captions" | methodarg == "chapters" | methodarg == "descriptions" | methodarg == "metadata" | methodarg == "subtitles") {

        // Set the attribute value
        this.htmlkind = `" kind=""' + methodarg + `"""'

    } // End IF Block for validated argument value

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

} // End of Method kind declaration for class track

// Specifies the title of the text track
class track scalar track::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 track

// Required. Specifies the URL of the track file
class track scalar track::setSrc(| string scalar methodarg) {

    // Set the attribute src for this class
    this.htmlsrc = `" src=""' + methodarg + `"""'

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

} // End of Method src declaration for class track

// Specifies the language of the track text data (required if kind="subtitles")
class track scalar track::setSrclang(| string scalar methodarg) {

    // Set the attribute srclang for this class
    this.htmlsrclang = `" srclang=""' + methodarg + `"""'

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

} // End of Method srclang declaration for class track

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

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

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

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

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

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

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

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

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

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

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

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

// Getter method for default member variable
string scalar track::getDefault() {

    // Returns the default variable
    return(this.htmldefault)

} // End of getter method for default member of class track

// Getter method for kind member variable
string scalar track::getKind() {

    // Returns the kind variable
    return(this.htmlkind)

} // End of getter method for kind member of class track

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

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

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

// Getter method for src member variable
string scalar track::getSrc() {

    // Returns the src variable
    return(this.htmlsrc)

} // End of getter method for src member of class track

// Getter method for srclang member variable
string scalar track::getSrclang() {

    // Returns the srclang variable
    return(this.htmlsrclang)

} // End of getter method for srclang member of class track

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

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

    // Create opening string
    open = getOpens() + getDefault() + getKind() + getLabel() + getSrc() + getSrclang() + 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 track

// End of Mata session
end