poco.js

(function() {
	var poco = (function () {

		var table = {}, 
		roots = [
			'C','C#','D','Eb','E', 'F','F#','G','Ab','A','Bb','B'
		],
		variations = [
			'', 'min', 'aug', 'dim', 'sus4', 
			'maj7', 'min7', '7#5', '7b5', 'dim7', '7sus4',
			'7', 'mM7', 'm7#5',  'm7b5', 'sus2',
			'6', 'm6', '9', '6add9', 'm9', '9#5', '9b5', 'add9',
			'maj7b5','7sus2','5','11','m11','13',
			'm13','maj13','7#9','7b9','7b5b9','7#11', 
			'7b9b13','7#9#11', '13b9', '13b9b5'
		];
		this.count = 0;

		var init = function(){
			if(!teoria){
				console.error('Poco requires teoria.');
			}
			poco.count = 0;
			for(var i in roots){
				for(var v in variations){

					var chordname = roots[i]+variations[v];
					var chord = teoria.chord(chordname),
					notes = chord.notes();

					// Calculate inversions
					for(var t = 0 ; t<notes.length ; t++){
						
						notes = invert(notes, t);
						var key = [];

						for(var z in notes){
							var n = notes[z];
							key.push(n.name()+n.accidental());
						}

						var newname = t>0 ? chordname + ('/'+notes[0].name().toUpperCase()+notes[0].accidental()) : chordname;
						// Fix teoria key alignment
						replace(key,'bb','a#');
						replace(key,'c#','db');

						key = key.join('-');
						var entry = table[key];

						if(!entry){
							table[key] = {name: newname, t: chord, othernames:[], inversion:t};
						}else{
							// Overwrite previous inversions with closer match
							if(t<entry.inversion){
								entry.othernames.push(entry.name);
								entry.name = newname;
								entry.inversion = t;
								table.chord = chord;
							}else{
								entry.othernames.push(newname);
							}
						}
						poco.count++;
					}
				}
			}
		};

		var invert = function(notes, inversion){
			if(inversion>0){
				for(var z in notes){
					var k = notes[z];
					var nam = k.name();
					var acc = k.accidental();
					var fullName = nam + acc;
					notes[z] = teoria.note(fullName);
				}
				return rotate(notes, 1);
			}else{
				return notes;
			}
		};

		var rotate = function(arr, n) {
			if(n===0){
				return arr;
			}
			return arr.slice(n, arr.length).concat(arr.slice(0, n));
		};

		var destroy = function(){
			table = {};
		};

		var replace = function(arr, needle, text){
			var i = arr.indexOf(needle);
			if (~i) {
			    arr[i] = text;
			}
		};

		var find = function(arr){
			return table[arr.join('-').toLowerCase()];
		};


		return {
			init:init,
			destroy:destroy,
			count:this.count,
			find:find
		};

	})();
	if (typeof module !== 'undefined' && typeof module.exports !== 'undefined'){
		module.exports = poco;
	}else{
		window.poco = poco;
	}
})();