JFugue 12. Parser

We can parse a MIDI file, a Staccato String, etc.

Here we parse a Staccato String (converted to Pattern). Thus we use a StaccatoListener. We can always use a StaccatoListener as we can always convert a MIDI file (or another format) into a Pattern.

This program has two Java files. This is JFugue12a, which is a subclass of ParserListenerAdapter. We only override its onNoteParsed which gets individual notes. Here we count the number of notes belonging to a family such as "C", any octave. To find instrument information, etc. we can override another method. All the methods have empty implementations in the superclass.

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package jfugue12;

import org.jfugue.parser.ParserListenerAdapter;
import org.jfugue.theory.Note;

class JFugue12a extends ParserListenerAdapter {
    private int[] counter = new int[12];
    
    @Override
    public void onNoteParsed(Note note) {
        if (note.isRest()) return;
        counter[note.getPositionInOctave()]++;
    }
    
    String getCounter() {
        StringBuilder sb = new StringBuilder();
        for (byte i = 0; i<counter.length; i++) {
            sb.append("\n");
            sb.append(Note.getToneStringWithoutOctave(i));
            sb.append(":\t");
            sb.append(counter[i]);
        }
        return sb.toString();
    }
}

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This is the main file which parses the Pattern.

Once the Pattern is parsed, we call getCounter() method of JFugue12a, to get String to display listing the counts.

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package jfugue12;

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextArea;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.scene.text.Font;
import javafx.stage.Stage;
import org.jfugue.pattern.Pattern;
import org.jfugue.realtime.RealtimePlayer;
import org.staccato.StaccatoParser;

public class JFugue12 extends Application {
    
    public static void main(String[] args) {
        launch(args);
    }
    
    RealtimePlayer player;
    TextArea text;
    Button button;
    
    @Override
    public void stop() {
        player.close();
    }
    @Override
    public void start(Stage primaryStage) throws Exception {
        
        button = new Button("Parse");
        button.setPrefSize(150, 100);
        button.setOnAction(e->example());
        button.setFont(Font.font("Verdana", 20));
        
        player = new RealtimePlayer();
        
        VBox examples = new VBox(10, button);
        examples.setPadding(new Insets(10));
        
        text = new TextArea();
        text.setPrefRowCount(20);
        text.setPrefColumnCount(32);
        text.setFont(Font.font("Verdana", 20));
        text.setEditable(false);
        text.setWrapText(true);
        
        HBox root = new HBox(50,examples,text);
        
        Scene scene = new Scene(root, 900, 600);
        primaryStage.setTitle("JFugue 12. Parser");
        
        primaryStage.setScene(scene);
        primaryStage.show();
    }
    
    private void example() {
        String patt = "C5q Rq D5q Rq E5h Rq C4h";
        Pattern pattern = new Pattern(patt);
        
        StaccatoParser parser = new StaccatoParser();
        JFugue12a listener = new JFugue12a();
        parser.addParserListener(listener);
        parser.parse(pattern);
        
        text.setText("\nWe have these Notes:\n\n");
        text.appendText(listener.getCounter());
        
        player.play(pattern);
    }
}

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This is the output:

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