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MMLParser.js
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MMLParser.js
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;(function(global) {
'use strict';
function MMLParser() {}
global.MMLParser = MMLParser;
MMLParser.prototype.play = play;
function play() {
var mmlSource = $('#mml').val();
var midiCmds = parseMML(mmlSource);
playMidi(midiCmds);
}
function parseMML(mmlSource) {
var midiCmds = [];
var baseNoteNr = {c: 0, d: 2, e: 4, f: 5, g: 7, a: 9, b: 11};
var globProp = {
tempo: 120.0,
noteLen: 4,
velocity: 127,
octave: 4
}
var noteProp = {
noteNr: 60,
chromaticOffset: 0,
noteLen: globProp.noteLen
};
mmlSource = mmlSource.toLowerCase();
for (var i = 0; i < mmlSource.length; i++) {
var c = mmlSource[i];
switch (c) {
case 'c': case 'd': case 'e': case 'f': case 'g': case 'a': case 'b':
// chromatic
noteProp.chromaticOffset = 0;
if (i + 1 < mmlSource.length && (mmlSource[i + 1] === '+' || mmlSource[i + 1] === '-')) {
for (i = i + 1; i < mmlSource.length; i++) {
if (mmlSource[i] === '+') {
noteProp.chromaticOffset++;
} else if (mmlSource[i] === '-') {
noteProp.chromaticOffset--;
} else {
break;
}
}
i--;
}
noteProp.noteNr = baseNoteNr[c] + (globProp.octave + 1) * 12 + noteProp.chromaticOffset;
// note-length
if (i + 1 < mmlSource.length && isdigit(mmlSource[i + 1])) {
var intStr = '';
for (i = i + 1; i < mmlSource.length && isdigit(mmlSource[i]); i++) {
intStr += mmlSource[i];
}
noteProp.noteLen = Number(intStr);
i--;
} else {
noteProp.noteLen = globProp.noteLen;
}
if (i + 1 < mmlSource.length && mmlSource[i + 1] === '.') {
for (i = i + 1; i < mmlSource.length && mmlSource[i] === '.'; i++) {
noteProp.noteLen /= 1.5;
}
i--;
}
midiCmds.push({
noteOn: [0x90, noteProp.noteNr, globProp.velocity],
noteOff: [0x80, noteProp.noteNr, globProp.velocity],
isNote: true,
length: 60 * 1000 * (4.0 / noteProp.noteLen) / globProp.tempo
});
break;
case 'r':
if (i + 1 < mmlSource.length && isdigit(mmlSource[i + 1])) {
var intStr = '';
for (i = i + 1; i < mmlSource.length && isdigit(mmlSource[i]); i++) {
intStr += mmlSource[i];
}
noteProp.noteLen = Number(intStr);
i--;
} else {
noteProp.noteLen = globProp.noteLen;
}
if (i + 1 < mmlSource.length && mmlSource[i + 1] === '.') {
for (i = i + 1; i < mmlSource.length && mmlSource[i] === '.'; i++) {
noteProp.noteLen /= 1.5;
}
i--;
}
midiCmds.push({
isNote: false,
length: 60 * 1000 * (4.0 / noteProp.noteLen) / globProp.tempo
});
break;
case '<':
globProp.octave++;
break;
case '>':
globProp.octave--;
break;
case 'o':
i++;
globProp.octave = Number(mmlSource[i]);
break;
case 't':
var intStr = '';
for (i = i + 1; i < mmlSource.length && isdigit(mmlSource[i]); i++) {
intStr += mmlSource[i];
}
i--;
globProp.tempo = Number(intStr);
break;
case 'l':
i++;
globProp.noteLen = Number(mmlSource[i]);
break;
default:
break;
}
}
return midiCmds;
}
function isdigit(c) {
return c.match(/[0-9]/);
}
function playMidi(midiCmds) {
var basetime = global.performance.now();
var time = basetime;
var outputSelect = global.midi.getOutput();
for (var i = 0; i < midiCmds.length; i++) {
var cmd = midiCmds[i];
if (cmd.isNote) {
outputSelect.send(cmd.noteOn, time);
time += cmd.length;
outputSelect.send(cmd.noteOff, time);
} else {
time += cmd.length;
}
}
}
})((this || 0).self || global);