// Switch to Mata interpreter/compiler
mata:

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

// Definition of HTML Tag audio Mata Class
// Defines sound content// Information retrieved from http://www.w3schools.com/tags/tag_audio.asp
class audio extends htmlglobal {

    // Define private member variables
    private:

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

    // String scalar attributes
    string               scalar          htmlautoplay, htmlcontrols, htmlloop, htmlmuted, htmlpreload, htmlsrc

    // 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        audio     scalar  setClassArgs(), setAutoplay(), setControls(), setLoop(), setMuted(), setPreload(), setSrc()

    // Getter methods
    string               scalar          getOpens(), getOpene(), getClose(), print(), getClassArgs(), getAutoplay(), getControls(), getLoop(), getMuted(), getPreload(), getSrc()

} // End of class declaration

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

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

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

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

} // End of class constructor method definition

// Setter method for class arguments (appear between HTML tags)
class audio scalar audio::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 audio will start playing as soon as it is ready
class audio scalar audio::setAutoplay(| string scalar methodarg) {

    // Set the attribute autoplay for this class
    this.htmlautoplay = `" autoplay=""' + methodarg + `"""'

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

} // End of Method autoplay declaration for class audio

// Specifies that audio controls should be displayed (such as a play/pause button etc)
class audio scalar audio::setControls(| string scalar methodarg) {

    // Set the attribute controls for this class
    this.htmlcontrols = `" controls=""' + methodarg + `"""'

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

} // End of Method controls declaration for class audio

// Specifies that the audio will start over again, every time it is finished
class audio scalar audio::setLoop(| string scalar methodarg) {

    // Set the attribute loop for this class
    this.htmlloop = `" loop=""' + methodarg + `"""'

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

} // End of Method loop declaration for class audio

// Specifies that the audio output should be muted
class audio scalar audio::setMuted(| string scalar methodarg) {

    // Set the attribute muted for this class
    this.htmlmuted = `" muted=""' + methodarg + `"""'

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

} // End of Method muted declaration for class audio

// Specifies if and how the author thinks the audio should be loaded when the page loads
class audio scalar audio::setPreload(| string scalar methodarg) {

    // Validate argument
    if (methodarg == "auto" | methodarg == "metadata" | methodarg == "none") {

        // Set the attribute value
        this.htmlpreload = `" preload=""' + methodarg + `"""'

    } // End IF Block for validated argument value

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

} // End of Method preload declaration for class audio

// Specifies the URL of the audio file
class audio scalar audio::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 audio

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

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

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

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

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

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

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

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

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

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

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

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

// Getter method for autoplay member variable
string scalar audio::getAutoplay() {

    // Returns the autoplay variable
    return(this.htmlautoplay)

} // End of getter method for autoplay member of class audio

// Getter method for controls member variable
string scalar audio::getControls() {

    // Returns the controls variable
    return(this.htmlcontrols)

} // End of getter method for controls member of class audio

// Getter method for loop member variable
string scalar audio::getLoop() {

    // Returns the loop variable
    return(this.htmlloop)

} // End of getter method for loop member of class audio

// Getter method for muted member variable
string scalar audio::getMuted() {

    // Returns the muted variable
    return(this.htmlmuted)

} // End of getter method for muted member of class audio

// Getter method for preload member variable
string scalar audio::getPreload() {

    // Returns the preload variable
    return(this.htmlpreload)

} // End of getter method for preload member of class audio

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

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

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

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

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

    // Create opening string
    open = getOpens() + getAutoplay() + getControls() + getLoop() + getMuted() + getPreload() + getSrc() + 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 audio

// End of Mata session
end