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teoria.js
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teoria.js
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!function(e){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=e();else if("function"==typeof define&&define.amd)define([],e);else{var f;"undefined"!=typeof window?f=window:"undefined"!=typeof global?f=global:"undefined"!=typeof self&&(f=self),f.teoria=e()}}(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
var Note = require('./lib/note');
var Interval = require('./lib/interval');
var Chord = require('./lib/chord');
var Scale = require('./lib/scale');
// never thought I would write this, but: Legacy support
function intervalConstructor(from, to) {
// Construct a Interval object from string representation
if (typeof from === 'string')
return Interval.toCoord(from);
if (typeof to === 'string' && from instanceof Note)
return Interval.from(from, Interval.toCoord(to));
if (to instanceof Interval && from instanceof Note)
return Interval.from(from, to);
if (to instanceof Note && from instanceof Note)
return Interval.between(from, to);
throw new Error('Invalid parameters');
}
intervalConstructor.toCoord = Interval.toCoord;
intervalConstructor.from = Interval.from;
intervalConstructor.between = Interval.between;
intervalConstructor.invert = Interval.invert;
function noteConstructor(name, duration) {
if (typeof name === 'string')
return Note.fromString(name, duration);
else
return new Note(name, duration);
}
noteConstructor.fromString = Note.fromString;
noteConstructor.fromKey = Note.fromKey;
noteConstructor.fromFrequency = Note.fromFrequency;
noteConstructor.fromMIDI = Note.fromMIDI;
function chordConstructor(name, symbol) {
if (typeof name === 'string') {
var root, octave;
root = name.match(/^([a-h])(x|#|bb|b?)/i);
if (root && root[0]) {
octave = typeof symbol === 'number' ? symbol.toString(10) : '4';
return new Chord(Note.fromString(root[0].toLowerCase() + octave),
name.substr(root[0].length));
}
} else if (name instanceof Note)
return new Chord(name, symbol);
throw new Error('Invalid Chord. Couldn\'t find note name');
}
function scaleConstructor(tonic, scale) {
tonic = (tonic instanceof Note) ? tonic : teoria.note(tonic);
return new Scale(tonic, scale);
}
var teoria = {
note: noteConstructor,
chord: chordConstructor,
interval: intervalConstructor,
scale: scaleConstructor,
Note: Note,
Chord: Chord,
Scale: Scale,
Interval: Interval
};
require('./lib/sugar')(teoria);
exports = module.exports = teoria;
},{"./lib/chord":2,"./lib/interval":3,"./lib/note":5,"./lib/scale":6,"./lib/sugar":7}],2:[function(require,module,exports){
var daccord = require('daccord');
var knowledge = require('./knowledge');
var Note = require('./note');
var Interval = require('./interval');
function Chord(root, name) {
if (!(this instanceof Chord)) return new Chord(root, name);
name = name || '';
this.name = root.name().toUpperCase() + root.accidental() + name;
this.symbol = name;
this.root = root;
this.intervals = [];
this._voicing = [];
var bass = name.split('/');
if (bass.length === 2 && bass[1].trim() !== '9') {
name = bass[0];
bass = bass[1].trim();
} else {
bass = null;
}
this.intervals = daccord(name).map(Interval.toCoord)
this._voicing = this.intervals.slice();
if (bass) {
var intervals = this.intervals, bassInterval, note;
// Make sure the bass is atop of the root note
note = Note.fromString(bass + (root.octave() + 1)); // crude
bassInterval = Interval.between(root, note);
bass = bassInterval.simple();
bassInterval = bassInterval.invert().direction('down');
this._voicing = [bassInterval];
for (var i = 0, length = intervals.length; i < length; i++) {
if (!intervals[i].simple().equal(bass))
this._voicing.push(intervals[i]);
}
}
}
Chord.prototype = {
notes: function() {
var root = this.root;
return this.voicing().map(function(interval) {
return root.interval(interval);
});
},
simple: function() {
return this.notes().map(function(n) { return n.toString(true); });
},
bass: function() {
return this.root.interval(this._voicing[0]);
},
voicing: function(voicing) {
// Get the voicing
if (!voicing) {
return this._voicing;
}
// Set the voicing
this._voicing = [];
for (var i = 0, length = voicing.length; i < length; i++) {
this._voicing[i] = Interval.toCoord(voicing[i]);
}
return this;
},
resetVoicing: function() {
this._voicing = this.intervals;
},
dominant: function(additional) {
additional = additional || '';
return new Chord(this.root.interval('P5'), additional);
},
subdominant: function(additional) {
additional = additional || '';
return new Chord(this.root.interval('P4'), additional);
},
parallel: function(additional) {
additional = additional || '';
var quality = this.quality();
if (this.chordType() !== 'triad' || quality === 'diminished' ||
quality === 'augmented') {
throw new Error('Only major/minor triads have parallel chords');
}
if (quality === 'major') {
return new Chord(this.root.interval('m3', 'down'), 'm');
} else {
return new Chord(this.root.interval('m3', 'up'));
}
},
quality: function() {
var third, fifth, seventh, intervals = this.intervals;
for (var i = 0, length = intervals.length; i < length; i++) {
if (intervals[i].number() === 3) {
third = intervals[i];
} else if (intervals[i].number() === 5) {
fifth = intervals[i];
} else if (intervals[i].number() === 7) {
seventh = intervals[i];
}
}
if (!third) {
return;
}
third = (third.direction() === 'down') ? third.invert() : third;
third = third.simple().toString();
if (fifth) {
fifth = (fifth.direction === 'down') ? fifth.invert() : fifth;
fifth = fifth.simple().toString();
}
if (seventh) {
seventh = (seventh.direction === 'down') ? seventh.invert() : seventh;
seventh = seventh.simple().toString();
}
if (third === 'M3') {
if (fifth === 'A5') {
return 'augmented';
} else if (fifth === 'P5') {
return (seventh === 'm7') ? 'dominant' : 'major';
}
return 'major';
} else if (third === 'm3') {
if (fifth === 'P5') {
return 'minor';
} else if (fifth === 'd5') {
return (seventh === 'm7') ? 'half-diminished' : 'diminished';
}
return 'minor';
}
},
chordType: function() { // In need of better name
var length = this.intervals.length, interval, has, invert, i, name;
if (length === 2) {
return 'dyad';
} else if (length === 3) {
has = {first: false, third: false, fifth: false};
for (i = 0; i < length; i++) {
interval = this.intervals[i];
invert = interval.invert();
if (interval.base() in has) {
has[interval.base()] = true;
} else if (invert.base() in has) {
has[invert.base()] = true;
}
}
name = (has.first && has.third && has.fifth) ? 'triad' : 'trichord';
} else if (length === 4) {
has = {first: false, third: false, fifth: false, seventh: false};
for (i = 0; i < length; i++) {
interval = this.intervals[i];
invert = interval.invert();
if (interval.base() in has) {
has[interval.base()] = true;
} else if (invert.base() in has) {
has[invert.base()] = true;
}
}
if (has.first && has.third && has.fifth && has.seventh) {
name = 'tetrad';
}
}
return name || 'unknown';
},
get: function(interval) {
if (typeof interval === 'string' && interval in knowledge.stepNumber) {
var intervals = this.intervals, i, length;
interval = knowledge.stepNumber[interval];
for (i = 0, length = intervals.length; i < length; i++) {
if (intervals[i].number() === interval) {
return this.root.interval(intervals[i]);
}
}
return null;
} else {
throw new Error('Invalid interval name');
}
},
interval: function(interval) {
return new Chord(this.root.interval(interval), this.symbol);
},
transpose: function(interval) {
this.root.transpose(interval);
this.name = this.root.name().toUpperCase() +
this.root.accidental() + this.symbol;
return this;
},
toString: function() {
return this.name;
}
};
module.exports = Chord;
},{"./interval":3,"./knowledge":4,"./note":5,"daccord":9}],3:[function(require,module,exports){
var knowledge = require('./knowledge');
var vector = require('./vector');
var toCoord = require('interval-coords');
function Interval(coord) {
if (!(this instanceof Interval)) return new Interval(coord);
this.coord = coord;
}
Interval.prototype = {
name: function() {
return knowledge.intervalsIndex[this.number() - 1];
},
semitones: function() {
return vector.sum(vector.mul(this.coord, [12, 7]));
},
number: function() {
return Math.abs(this.value());
},
value: function() {
var without = vector.sub(this.coord,
vector.mul(knowledge.sharp, Math.floor((this.coord[1] - 2) / 7) + 1))
, i, val;
i = knowledge.intervalFromFifth[without[1] + 5];
val = knowledge.stepNumber[i] + (without[0] - knowledge.intervals[i][0]) * 7;
return (val > 0) ? val : val - 2;
},
type: function() {
return knowledge.intervals[this.base()][0] <= 1 ? 'perfect' : 'minor';
},
base: function() {
var fifth = vector.sub(this.coord, vector.mul(knowledge.sharp, this.qualityValue()))[1], name;
fifth = this.value() > 0 ? fifth + 5 : -(fifth - 5) % 7;
fifth = fifth < 0 ? knowledge.intervalFromFifth.length + fifth : fifth;
name = knowledge.intervalFromFifth[fifth];
if (name === 'unison' && this.number() >= 8)
name = 'octave';
return name;
},
direction: function(dir) {
if (dir) {
var is = this.value() >= 1 ? 'up' : 'down';
if (is !== dir)
this.coord = vector.mul(this.coord, -1);
return this;
}
else
return this.value() >= 1 ? 'up' : 'down';
},
simple: function(ignore) {
// Get the (upwards) base interval (with quality)
var simple = knowledge.intervals[this.base()];
simple = vector.add(simple, vector.mul(knowledge.sharp, this.qualityValue()));
// Turn it around if necessary
if (!ignore)
simple = this.direction() === 'down' ? vector.mul(simple, -1) : simple;
return new Interval(simple);
},
isCompound: function() {
return this.number() > 8;
},
octaves: function() {
var without, octaves;
if (this.direction() === 'up') {
without = vector.sub(this.coord, vector.mul(knowledge.sharp, this.qualityValue()));
octaves = without[0] - knowledge.intervals[this.base()][0];
} else {
without = vector.sub(this.coord, vector.mul(knowledge.sharp, -this.qualityValue()));
octaves = -(without[0] + knowledge.intervals[this.base()][0]);
}
return octaves;
},
invert: function() {
var i = this.base();
var qual = this.qualityValue();
var acc = this.type() === 'minor' ? -(qual - 1) : -qual;
var coord = knowledge.intervals[knowledge.intervalsIndex[9 - knowledge.stepNumber[i] - 1]];
coord = vector.add(coord, vector.mul(knowledge.sharp, acc));
return new Interval(coord);
},
quality: function(lng) {
var quality = knowledge.alterations[this.type()][this.qualityValue() + 2];
return lng ? knowledge.qualityLong[quality] : quality;
},
qualityValue: function() {
if (this.direction() === 'down')
return Math.floor((-this.coord[1] - 2) / 7) + 1;
else
return Math.floor((this.coord[1] - 2) / 7) + 1;
},
equal: function(interval) {
return this.coord[0] === interval.coord[0] &&
this.coord[1] === interval.coord[1];
},
greater: function(interval) {
var semi = this.semitones();
var isemi = interval.semitones();
// If equal in absolute size, measure which interval is bigger
// For example P4 is bigger than A3
return (semi === isemi) ?
(this.number() > interval.number()) : (semi > isemi);
},
smaller: function(interval) {
return !this.equal(interval) && !this.greater(interval);
},
add: function(interval) {
return new Interval(vector.add(this.coord, interval.coord));
},
toString: function(ignore) {
// If given true, return the positive value
var number = ignore ? this.number() : this.value();
return this.quality() + number;
}
}
Interval.toCoord = function(simple) {
var coord = toCoord(simple);
if (!coord)
throw new Error('Invalid simple format interval');
return new Interval(coord);
}
Interval.from = function(from, to) {
return from.interval(to);
}
Interval.between = function(from, to) {
return new Interval(vector.sub(to.coord, from.coord));
}
Interval.invert = function(sInterval) {
return Interval.toCoord(sInterval).invert().toString();
}
module.exports = Interval;
},{"./knowledge":4,"./vector":8,"interval-coords":13}],4:[function(require,module,exports){
// Note coordinates [octave, fifth] relative to C
module.exports = {
notes: {
c: [0, 0],
d: [-1, 2],
e: [-2, 4],
f: [1, -1],
g: [0, 1],
a: [-1, 3],
b: [-2, 5],
h: [-2, 5]
},
intervals: {
unison: [0, 0],
second: [3, -5],
third: [2, -3],
fourth: [1, -1],
fifth: [0, 1],
sixth: [3, -4],
seventh: [2, -2],
octave: [1, 0]
},
intervalFromFifth: ['second', 'sixth', 'third', 'seventh', 'fourth',
'unison', 'fifth'],
intervalsIndex: ['unison', 'second', 'third', 'fourth', 'fifth',
'sixth', 'seventh', 'octave', 'ninth', 'tenth',
'eleventh', 'twelfth', 'thirteenth', 'fourteenth',
'fifteenth'],
// linaer index to fifth = (2 * index + 1) % 7
fifths: ['f', 'c', 'g', 'd', 'a', 'e', 'b'],
accidentals: ['bb', 'b', '', '#', 'x'],
sharp: [-4, 7],
A4: [3, 3],
durations: {
'0.25': 'longa',
'0.5': 'breve',
'1': 'whole',
'2': 'half',
'4': 'quarter',
'8': 'eighth',
'16': 'sixteenth',
'32': 'thirty-second',
'64': 'sixty-fourth',
'128': 'hundred-twenty-eighth'
},
qualityLong: {
P: 'perfect',
M: 'major',
m: 'minor',
A: 'augmented',
AA: 'doubly augmented',
d: 'diminished',
dd: 'doubly diminished'
},
alterations: {
perfect: ['dd', 'd', 'P', 'A', 'AA'],
minor: ['dd', 'd', 'm', 'M', 'A', 'AA']
},
symbols: {
'min': ['m3', 'P5'],
'm': ['m3', 'P5'],
'-': ['m3', 'P5'],
'M': ['M3', 'P5'],
'': ['M3', 'P5'],
'+': ['M3', 'A5'],
'aug': ['M3', 'A5'],
'dim': ['m3', 'd5'],
'o': ['m3', 'd5'],
'maj': ['M3', 'P5', 'M7'],
'dom': ['M3', 'P5', 'm7'],
'ø': ['m3', 'd5', 'm7'],
'5': ['P5']
},
chordShort: {
'major': 'M',
'minor': 'm',
'augmented': 'aug',
'diminished': 'dim',
'half-diminished': '7b5',
'power': '5',
'dominant': '7'
},
stepNumber: {
'unison': 1,
'first': 1,
'second': 2,
'third': 3,
'fourth': 4,
'fifth': 5,
'sixth': 6,
'seventh': 7,
'octave': 8,
'ninth': 9,
'eleventh': 11,
'thirteenth': 13
},
// Adjusted Shearer syllables - Chromatic solfege system
// Some intervals are not provided for. These include:
// dd2 - Doubly diminished second
// dd3 - Doubly diminished third
// AA3 - Doubly augmented third
// dd6 - Doubly diminished sixth
// dd7 - Doubly diminished seventh
// AA7 - Doubly augmented seventh
intervalSolfege: {
'dd1': 'daw',
'd1': 'de',
'P1': 'do',
'A1': 'di',
'AA1': 'dai',
'd2': 'raw',
'm2': 'ra',
'M2': 're',
'A2': 'ri',
'AA2': 'rai',
'd3': 'maw',
'm3': 'me',
'M3': 'mi',
'A3': 'mai',
'dd4': 'faw',
'd4': 'fe',
'P4': 'fa',
'A4': 'fi',
'AA4': 'fai',
'dd5': 'saw',
'd5': 'se',
'P5': 'so',
'A5': 'si',
'AA5': 'sai',
'd6': 'law',
'm6': 'le',
'M6': 'la',
'A6': 'li',
'AA6': 'lai',
'd7': 'taw',
'm7': 'te',
'M7': 'ti',
'A7': 'tai',
'dd8': 'daw',
'd8': 'de',
'P8': 'do',
'A8': 'di',
'AA8': 'dai'
}
}
},{}],5:[function(require,module,exports){
var scientific = require('scientific-notation');
var helmholtz = require('helmholtz');
var pitchFq = require('pitch-fq');
var knowledge = require('./knowledge');
var vector = require('./vector');
var Interval = require('./interval');
function pad(str, ch, len) {
for (; len > 0; len--) {
str += ch;
}
return str;
}
function Note(coord, duration) {
if (!(this instanceof Note)) return new Note(coord, duration);
duration = duration || {};
this.duration = { value: duration.value || 4, dots: duration.dots || 0 };
this.coord = coord;
}
Note.prototype = {
octave: function() {
return this.coord[0] + knowledge.A4[0] - knowledge.notes[this.name()][0] +
this.accidentalValue() * 4;
},
name: function() {
return knowledge.fifths[this.coord[1] + knowledge.A4[1] - this.accidentalValue() * 7 + 1];
},
accidentalValue: function() {
return Math.round((this.coord[1] + knowledge.A4[1] - 2) / 7);
},
accidental: function() {
return knowledge.accidentals[this.accidentalValue() + 2];
},
/**
* Returns the key number of the note
*/
key: function(white) {
if (white)
return this.coord[0] * 7 + this.coord[1] * 4 + 29;
else
return this.coord[0] * 12 + this.coord[1] * 7 + 49;
},
/**
* Returns a number ranging from 0-127 representing a MIDI note value
*/
midi: function() {
return this.key() + 20;
},
/**
* Calculates and returns the frequency of the note.
* Optional concert pitch (def. 440)
*/
fq: function(concertPitch) {
return pitchFq(this.coord, concertPitch)
},
/**
* Returns the pitch class index (chroma) of the note
*/
chroma: function() {
var value = (vector.sum(vector.mul(this.coord, [12, 7])) - 3) % 12;
return (value < 0) ? value + 12 : value;
},
interval: function(interval) {
if (typeof interval === 'string') interval = Interval.toCoord(interval);
if (interval instanceof Interval)
return new Note(vector.add(this.coord, interval.coord));
else if (interval instanceof Note)
return new Interval(vector.sub(interval.coord, this.coord));
},
transpose: function(interval) {
this.coord = vector.add(this.coord, interval.coord);
return this;
},
/**
* Returns the Helmholtz notation form of the note (fx C,, d' F# g#'')
*/
helmholtz: function() {
var octave = this.octave();
var name = this.name();
name = octave < 3 ? name.toUpperCase() : name.toLowerCase();
var padchar = octave < 3 ? ',' : '\'';
var padcount = octave < 2 ? 2 - octave : octave - 3;
return pad(name + this.accidental(), padchar, padcount);
},
/**
* Returns the scientific notation form of the note (fx E4, Bb3, C#7 etc.)
*/
scientific: function() {
return this.name().toUpperCase() + this.accidental() + this.octave();
},
/**
* Returns notes that are enharmonic with this note.
*/
enharmonics: function(oneaccidental) {
var key = this.key(), limit = oneaccidental ? 2 : 3;
return ['m3', 'm2', 'm-2', 'm-3']
.map(this.interval.bind(this))
.filter(function(note) {
var acc = note.accidentalValue();
var diff = key - (note.key() - acc);
if (diff < limit && diff > -limit) {
note.coord = vector.add(note.coord, vector.mul(knowledge.sharp, diff - acc));
return true;
}
});
},
solfege: function(scale, showOctaves) {
var interval = scale.tonic.interval(this), solfege, stroke, count;
if (interval.direction() === 'down')
interval = interval.invert();
if (showOctaves) {
count = (this.key(true) - scale.tonic.key(true)) / 7;
count = (count >= 0) ? Math.floor(count) : -(Math.ceil(-count));
stroke = (count >= 0) ? '\'' : ',';
}
solfege = knowledge.intervalSolfege[interval.simple(true).toString()];
return (showOctaves) ? pad(solfege, stroke, Math.abs(count)) : solfege;
},
scaleDegree: function(scale) {
var inter = scale.tonic.interval(this);
// If the direction is down, or we're dealing with an octave - invert it
if (inter.direction() === 'down' ||
(inter.coord[1] === 0 && inter.coord[0] !== 0)) {
inter = inter.invert();
}
inter = inter.simple(true).coord;
return scale.scale.reduce(function(index, current, i) {
var coord = Interval.toCoord(current).coord;
return coord[0] === inter[0] && coord[1] === inter[1] ? i + 1 : index;
}, 0);
},
/**
* Returns the name of the duration value,
* such as 'whole', 'quarter', 'sixteenth' etc.
*/
durationName: function() {
return knowledge.durations[this.duration.value];
},
/**
* Returns the duration of the note (including dots)
* in seconds. The first argument is the tempo in beats
* per minute, the second is the beat unit (i.e. the
* lower numeral in a time signature).
*/
durationInSeconds: function(bpm, beatUnit) {
var secs = (60 / bpm) / (this.duration.value / 4) / (beatUnit / 4);
return secs * 2 - secs / Math.pow(2, this.duration.dots);
},
/**
* Returns the name of the note, with an optional display of octave number
*/
toString: function(dont) {
return this.name() + this.accidental() + (dont ? '' : this.octave());
}
};
Note.fromString = function(name, dur) {
var coord = scientific(name);
if (!coord) coord = helmholtz(name);
return new Note(coord, dur);
}
Note.fromKey = function(key) {
var octave = Math.floor((key - 4) / 12);
var distance = key - (octave * 12) - 4;
var name = knowledge.fifths[(2 * Math.round(distance / 2) + 1) % 7];
var note = vector.add(vector.sub(knowledge.notes[name], knowledge.A4), [octave + 1, 0]);
var diff = (key - 49) - vector.sum(vector.mul(note, [12, 7]));
return new Note(diff ? vector.add(note, vector.mul(knowledge.sharp, diff)) : note);
}
Note.fromFrequency = function(fq, concertPitch) {
var key, cents, originalFq;
concertPitch = concertPitch || 440;
key = 49 + 12 * ((Math.log(fq) - Math.log(concertPitch)) / Math.log(2));
key = Math.round(key);
originalFq = concertPitch * Math.pow(2, (key - 49) / 12);
cents = 1200 * (Math.log(fq / originalFq) / Math.log(2));
return { note: Note.fromKey(key), cents: cents };
}
Note.fromMIDI = function(note) {
return Note.fromKey(note - 20);
}
module.exports = Note;
},{"./interval":3,"./knowledge":4,"./vector":8,"helmholtz":10,"pitch-fq":14,"scientific-notation":15}],6:[function(require,module,exports){
var knowledge = require('./knowledge');
var Interval = require('./interval');
var scales = {
aeolian: ['P1', 'M2', 'm3', 'P4', 'P5', 'm6', 'm7'],
blues: ['P1', 'm3', 'P4', 'd5', 'P5', 'm7'],
chromatic: ['P1', 'm2', 'M2', 'm3', 'M3', 'P4', 'A4', 'P5', 'm6', 'M6', 'm7', 'M7'],
dorian: ['P1', 'M2', 'm3', 'P4', 'P5', 'M6', 'm7'],
doubleharmonic: ['P1', 'm2', 'M3', 'P4', 'P5', 'm6', 'M7'],
harmonicminor: ['P1', 'M2', 'm3', 'P4', 'P5', 'm6', 'M7'],
ionian: ['P1', 'M2', 'M3', 'P4', 'P5', 'M6', 'M7'],
locrian: ['P1', 'm2', 'm3', 'P4', 'd5', 'm6', 'm7'],
lydian: ['P1', 'M2', 'M3', 'A4', 'P5', 'M6', 'M7'],
majorpentatonic: ['P1', 'M2', 'M3', 'P5', 'M6'],
melodicminor: ['P1', 'M2', 'm3', 'P4', 'P5', 'M6', 'M7'],
minorpentatonic: ['P1', 'm3', 'P4', 'P5', 'm7'],
mixolydian: ['P1', 'M2', 'M3', 'P4', 'P5', 'M6', 'm7'],
phrygian: ['P1', 'm2', 'm3', 'P4', 'P5', 'm6', 'm7'],
wholetone: ['P1', 'M2', 'M3', 'A4', 'A5', 'A6']
};
// synonyms
scales.harmonicchromatic = scales.chromatic;
scales.minor = scales.aeolian;
scales.major = scales.ionian;
scales.flamenco = scales.doubleharmonic;
function Scale(tonic, scale) {
if (!(this instanceof Scale)) return new Scale(tonic, scale);
var scaleName, i;
if (!('coord' in tonic)) {
throw new Error('Invalid Tonic');
}
if (typeof scale === 'string') {
scaleName = scale;
scale = scales[scale];
if (!scale)
throw new Error('Invalid Scale');
} else {
for (i in scales) {
if (scales.hasOwnProperty(i)) {
if (scales[i].toString() === scale.toString()) {
scaleName = i;
break;
}
}
}
}
this.name = scaleName;
this.tonic = tonic;
this.scale = scale;
}
Scale.prototype = {
notes: function() {
var notes = [];
for (var i = 0, length = this.scale.length; i < length; i++) {
notes.push(this.tonic.interval(this.scale[i]));
}
return notes;
},
simple: function() {
return this.notes().map(function(n) { return n.toString(true); });
},
type: function() {
var length = this.scale.length - 2;
if (length < 8) {
return ['di', 'tri', 'tetra', 'penta', 'hexa', 'hepta', 'octa'][length] +
'tonic';
}
},
get: function(i) {
i = (typeof i === 'string' && i in knowledge.stepNumber) ? knowledge.stepNumber[i] : i;
return this.tonic.interval(this.scale[i - 1]);
},
solfege: function(index, showOctaves) {
if (index)
return this.get(index).solfege(this, showOctaves);
return this.notes().map(function(n) {
return n.solfege(this, showOctaves);
});
},
interval: function(interval) {
interval = (typeof interval === 'string') ?
Interval.toCoord(interval) : interval;
return new Scale(this.tonic.interval(interval), this.scale);
},
transpose: function(interval) {
var scale = this.interval(interval);
this.scale = scale.scale;
this.tonic = scale.tonic;
return this;
}
};
Scale.KNOWN_SCALES = Object.keys(scales);
module.exports = Scale;
},{"./interval":3,"./knowledge":4}],7:[function(require,module,exports){
var knowledge = require('./knowledge');
module.exports = function(teoria) {
var Note = teoria.Note;
var Chord = teoria.Chord;
var Scale = teoria.Scale;
Note.prototype.chord = function(chord) {
chord = (chord in knowledge.chordShort) ? knowledge.chordShort[chord] : chord;
return new Chord(this, chord);
}
Note.prototype.scale = function(scale) {
return new Scale(this, scale);
}
}
},{"./knowledge":4}],8:[function(require,module,exports){
module.exports = {
add: function(note, interval) {
return [note[0] + interval[0], note[1] + interval[1]];
},
sub: function(note, interval) {
return [note[0] - interval[0], note[1] - interval[1]];