musicxml-iterator

This module aims to make melodic, harmonic, and rhythmic analysis easier by abstracting away the necessity of parsing MusicXML in the form of an Iterator. Demo coming soon!

const Iterator = require("musicxml-iterator");
const i = Iterator(musicXML); //create an Iterator instance from a MusicXML string
i.selectInstrument("Guitar");
i.next();

Installation

npm install musicxml-iterator

Supported functions

selectInstrument(instrumentName)

The iterator is set to the first measure of the instrument part specified by instrumentName (ex: "Violin") Throws an exception if no instrument of instrumentName is found. Use getInstrumentNames() to be safe.

getInstrumentNames()

gets the names of the instruments in the score (returns as an array)

next()

The iterator moves to the next "symbol" (note(s) or rest) and returns an object to represent that symbol, for example:

{notes: [{duration: 1, noteType: "quarter", pitch: "B3"},
         {duration: 1, noteType: "quarter", pitch: "D4"}],
 beat: 3};

So the next thing that the player sees to play in the above example is a B3 and D4, both quarter notes, hit on the downbeat of beat 3.

nextMeasure()

The iterator moves to the first beat of the next measure, throws an exception if no next measure

prevMeasure()

The iterator moves to the first beat of the previous measure, throws an exception if no previous measure

hasNext()

Returns true or false depending on whether or not there is a next symbol. Use this to avoid an exception being thrown by .nextMeasure().

prev()

The iterator moves to the previous symbol be it a note or rest and returns an object to represent that symbol

hasPrev()

Returns true or false depending on whether or not there is a previous symbol. Use this to avoid an exception being thrown by .prevMeasure().

getMeasureNum()

Returns the measure number currently at

getNumberOfMeasures()

Returns the number of measures

setMeasureNum()

Sets the iterator to the measure number specified. An exception will be thrown if attempting to set to an invalid measure number. The first measure is measure #1