music21j-port
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A toolkit for computer-aided musicology, Javascript version
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<h1 class="page-title">Source: music21/fromPython.js</h1>
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<pre
class="sunlight-highlight-javascript linenums">/**
* music21j -- Javascript reimplementation of Core music21p features.
* music21/fromPython -- Conversion from music21p jsonpickle streams
*
* Copyright (c) 2013-16, Michael Scott Cuthbert and cuthbertLab
* Based on music21 (=music21p), Copyright (c) 2006–16, Michael Scott Cuthbert and cuthbertLab
*
* usage:
*
* in python:
*
* s = corpus.parse('bwv66.6')
* stringRepresentingM21JsonPickle = s.freezeStream('jsonpickle')
*
* in js:
*
* pyConv = new music21.fromPython.Converter();
* s = pyConv.run(stringRepresentingM21JsonPickle);
*
*
*/
import * as jsonpickle from 'jsonpickle';
const jp = jsonpickle;
/**
* fromPython module -- see {@link music21.fromPython}
*/
const unpickler = jp.unpickler;
/**
* Converter for taking a Python-encoded jsonpickle music21p stream
* and loading it into music21j
*
* Very very alpha. See music21(p).vexflow modules to see how it works.
*
* Requires Cuthbert's jsonpickle.js port (included in music21j)
*
* @namespace music21.fromPython
* @extends music21
* @requires jsonpickle
*/
export const fromPython = {};
/**
*
* @class Converter
* @memberof music21.fromPython
* @property {boolean} debug
* @property {Array<string>} knownUnparsables - list of classes that cannot be parsed
* @property {Object} handlers - object mapping string names of classes to a set of function calls to perform when restoring or post-restoring. (too complicated to explain; read the code)
*/
export class Converter {
constructor() {
this.debug = true;
this.knownUnparsables = [
'music21.spanner.Line',
'music21.instrument.Instrument',
'music21.layout.StaffGroup',
'music21.layout.StaffLayout',
'music21.layout.SystemLayout',
'music21.layout.PageLayout',
'music21.expressions.TextExpression',
'music21.bar.Barline', // Soon...
'music21.tempo.MetronomeMark', // should be possible
'music21.metadata.Metadata', // Soon...
];
this.handlers = {
'music21.duration.Duration': {
post_restore: d => {
d.quarterLength = d._qtrLength;
return d;
},
},
'music21.meter.TimeSignature': {
post_restore: ts => {
ts._numerator = ts.displaySequence._numerator;
ts._denominator = ts.displaySequence._denominator;
return ts;
},
},
'music21.stream.Part': {
post_restore: p => {
this.currentPart = p;
this.lastClef = undefined;
this.lastKeySignature = undefined;
this.lastTimeSignature = undefined;
this.streamPostRestore(p);
return p;
},
},
// TODO: all inherit somehow, through _classes or better, prototype...
'music21.stream.Score': {
post_restore: this.streamPostRestore.bind(this),
},
'music21.stream.Stream': {
post_restore: this.streamPostRestore.bind(this),
},
'music21.stream.Measure': {
post_restore: this.streamPostRestore.bind(this),
},
'music21.stream.Voice': {
post_restore: this.streamPostRestore.bind(this),
},
};
this.currentPart = undefined;
this.lastClef = undefined;
this.lastKeySignature = undefined;
this.lastTimeSignature = undefined;
}
/**
* Fixes up some references that cannot be unpacked from jsonpickle.
*
* @method music21.fromPython.Converter#streamPostRestore
* @memberof music21.fromPython.Converter
* @param {music21.stream.Stream} s - stream after unpacking from jsonpickle
* @returns {music21.stream.Stream}
*/
streamPostRestore(s) {
const st = s._storedElementOffsetTuples;
s._clef = this.lastClef;
s._keySignature = this.lastKeySignature;
s._timeSignature = this.lastTimeSignature;
for (let i = 0; i < st.length; i++) {
const el = st[i][0];
el.offset = st[i][1];
let classList = el.classes;
if (classList === undefined) {
console.warn('M21object without classes: ', el);
console.warn('Javascript classes are: ', el._py_class);
classList = [];
}
let streamPart = this.currentPart;
if (streamPart === undefined) {
streamPart = s; // possibly a Stream constructed from .measures()
}
let appendEl = true;
let insertAtStart = false;
for (let j = 0; j < classList.length; j++) {
const thisClass = classList[j];
for (let kn = 0; kn < this.knownUnparsables.length; kn++) {
const unparsable = this.knownUnparsables[kn];
if (unparsable.indexOf(thisClass) !== -1) {
appendEl = false;
}
}
if (thisClass === 'TimeSignature') {
// console.log("Got timeSignature", streamPart, newM21pObj, storedElement);
s._timeSignature = el;
this.lastTimeSignature = el;
if (
streamPart !== undefined
&& streamPart.timeSignature === undefined
) {
streamPart.timeSignature = el;
}
appendEl = false;
} else if (thisClass === 'Clef') {
s._clef = el;
this.lastClef = el;
if (
streamPart !== undefined
&& streamPart.clef === undefined
) {
streamPart.clef = el;
}
appendEl = false;
} else if (thisClass === 'KeySignature') {
s._keySignature = el;
this.lastKeySignature = el;
if (
streamPart !== undefined
&& streamPart.keySignature === undefined
) {
streamPart.keySignature = el;
}
appendEl = false;
} else if (thisClass === 'Part') {
appendEl = false;
insertAtStart = true;
}
}
if (appendEl) {
s.append(el); // all but clef, ts, ks
} else if (insertAtStart) {
s.insert(0, el); // Part
}
}
return s;
}
/**
* Run the main decoder
*
* @method music21.fromPython.Converter#run
* @memberof music21.fromPython.Converter
* @param {string} jss - stream encoded as JSON
* @returns {music21.stream.Stream}
*/
run(jss) {
const outStruct = unpickler.decode(jss, this.handlers);
return outStruct.stream;
}
}
fromPython.Converter = Converter;
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