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test util

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This commit is contained in:
Felix Roos 2022-02-28 22:08:30 +01:00
parent ee2d32339f
commit 020c1d5589
2 changed files with 71 additions and 2 deletions
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13
util.mjs
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@ -1,7 +1,16 @@
export const isNote = (name) => /^[a-gA-G][#b]?[0-9]$/.test(name);
export const tokenizeNote = (note) => note.match(/^([a-gA-G])([#b])?([0-9])?$/).slice(1);
export const isNote = (name) => /^[a-gA-G][#b]*[0-9]$/.test(name);
export const tokenizeNote = (note) =>
typeof note === 'string'
? note
.match(/^([a-gA-G])([#b]*)([0-9])?$/)
?.slice(1)
?.map((x) => (x === undefined ? '' : x)) || []
: [];
export const toMidi = (note) => {
const [pc, acc, oct] = tokenizeNote(note);
if (!pc) {
throw new Error('not a note: "' + note + '"');
}
const chroma = { c: 0, d: 2, e: 4, f: 5, g: 7, a: 9, b: 11 }[pc.toLowerCase()];
const offset = acc?.split('').reduce((o, char) => o + { '#': 1, b: -1 }[char], 0) || 0;
return (Number(oct) + 1) * 12 + chroma + offset;