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A toolkit for computer-aided musicology, Javascript version
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<h1 class="page-title">Source: music21/figuredBass.js</h1>
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<pre
class="sunlight-highlight-javascript linenums">import { pitch } from './pitch.js';
const shorthandNotation = {
'': [5, 3],
'5': [5, 3],
'6': [6, 3],
'7': [7, 5, 3],
'9': [9, 7, 5, 3],
'11': [11, 9, 7, 5, 3],
'13': [13, 11, 9, 7, 5, 3],
'6,5': [6, 5, 3],
'4,3': [6, 4, 3],
'4,2': [6, 4, 2],
'2': [6, 4, 2],
};
/**
* In music21p is in figuredBass.notation -- eventually to be moved there.
*/
class Notation {
constructor(notationColumn) {
if (notationColumn === undefined) {
notationColumn = '';
}
this.notationColumn = notationColumn;
this.figureStrings = undefined;
this.origNumbers = undefined;
this.origModStrings = undefined;
this.numbers = undefined;
this.modifierStrings = undefined;
this._parseNotationColumn();
this._translateToLonghand();
this.modifiers = undefined;
this.figures = undefined;
this._getModifiers();
this._getFigures();
}
/**
* _parseNotationColumn - Given a notation column below a pitch, defines both this.numbers
* and this.modifierStrings, which provide the intervals above the
* bass and (if necessary) how to modify the corresponding pitches
* accordingly.
*
* @return {undefined}
*/
_parseNotationColumn() {
const nc = this.notationColumn;
const figures = nc.split(/,/);
const numbers = [];
const modifierStrings = [];
const figureStrings = [];
for (let figure of figures) {
figure = figure.trim();
figureStrings.push(figure);
let numberString = '';
let modifierString = '';
for (const c of figure) {
if (c.match(/\d/)) {
numberString += c;
} else {
modifierString += c;
}
}
let number;
if (numberString !== '') {
number = parseInt(numberString);
}
numbers.push(number);
if (modifierString === '') {
modifierString = undefined;
}
modifierStrings.push(modifierString);
}
this.origNumbers = numbers;
this.numbers = numbers;
this.modifierStrings = modifierStrings;
this.figureStrings = figureStrings;
}
_translateToLonghand() {
let oldNumbers = this.numbers;
let newNumbers = oldNumbers;
const oldModifierStrings = this.modifierStrings;
let newModifierStrings = oldModifierStrings;
const oldNumbersString = oldNumbers.toString();
if (shorthandNotation[oldNumbersString] !== undefined) {
newNumbers = shorthandNotation[oldNumbersString];
newModifierStrings = [];
const temp = [];
for (const number of oldNumbers) {
if (number === undefined) {
temp.push(3);
} else {
temp.push(number);
}
}
oldNumbers = temp;
for (const number of newNumbers) {
let newModifierString;
if (oldNumbers.includes(number)) {
const modifierStringIndex = oldNumbers.indexOf(number);
newModifierString = oldModifierStrings[modifierStringIndex];
}
newModifierStrings.push(newModifierString);
}
} else {
const temp = [];
for (const number of oldNumbers) {
if (number === undefined) {
temp.push(3);
} else {
temp.push(number);
}
}
newNumbers = temp;
}
this.numbers = newNumbers;
this.modifierStrings = newModifierStrings;
}
_getModifiers() {
const modifiers = [];
for (let i = 0; i < this.numbers.length; i++) {
const modifierString = this.modifierStrings[i];
const modifier = new Modifier(modifierString);
modifiers.push(modifier);
}
this.modifiers = modifiers;
}
_getFigures() {
const figures = [];
for (let i = 0; i < this.numbers.length; i++) {
const number = this.numbers[i];
const modifierString = this.modifierStrings[i];
const figure = new Figure(number, modifierString);
figures.push(figure);
}
this.figures = figures;
}
}
class Figure {
constructor(number, modifierString) {
this.number = number;
this.modifierString = modifierString;
this.modifier = new Modifier(modifierString);
}
}
const specialModifiers = {
'+': '#',
'/': '-',
'\\': '#',
b: '-',
bb: '--',
bbb: '---',
bbbb: '-----',
'++': '##',
'+++': '###',
'++++': '####',
};
class Modifier {
constructor(modifierString) {
this.modifierString = modifierString;
this.accidental = this._toAccidental();
}
_toAccidental() {
let modStr = this.modifierString;
if (modStr === undefined || modStr === '') {
return undefined;
}
const a = new pitch.Accidental();
if (specialModifiers[modStr] !== undefined) {
modStr = specialModifiers[modStr];
}
a.set(modStr);
return a;
}
modifyPitchName(pitchNameToAlter) {
const pitchToAlter = new pitch.Pitch(pitchNameToAlter);
this.modifyPitch(pitchToAlter, true);
return pitchToAlter.name;
}
modifyPitch(pitchToAlter, inPlace) {
if (inPlace !== true) {
pitchToAlter = pitchToAlter.clone();
}
if (this.accidental === undefined) {
return pitchToAlter;
}
if (
this.accidental.alter === 0.0
|| pitchToAlter.accidental === undefined
) {
pitchToAlter.accidental = this.accidental.clone();
} else {
const newAccidental = new pitch.Accidental();
const newAlter
= pitchToAlter.accidental.alter + this.accidental.alter;
newAccidental.set(newAlter);
pitchToAlter.accidental = newAccidental;
}
return pitchToAlter;
}
}
export const figuredBass = {
Notation,
Figure,
Modifier,
};
</pre>
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