function compose(e) {
const token = tokens.shift();
if (!token) {
return process.exit();
}
const playbackTime = e.playbackTime;
switch (token.type) {
case "punctuator":
sched.insert(playbackTime, hihat, { token });
break;
case "keyword":
sched.insert(playbackTime, chord, { token });
break;
case "number":
case "string":
sched.insert(playbackTime, beep, { token });
break;
default:
sched.insert(playbackTime, synth, { token });
break;
}
sched.insert(playbackTime + beat, compose);
}
function compose(e) {
const token = tokens.shift();
if (!token) {
return process.exit();
}
const t0 = e.playbackTime;
const index = e.args.index;
// kick
if (index % 4 === 0) {
sched.insert(t0, shot, { inst: 0, amp: 0.4, dur: 1 });
} else {
if (token.type === "keyword") {
const amp = token.type === "identifier" ? 0.25 : 0.125;
sched.insert(t0, shot, { inst: 0, amp: amp, dur: 0.25 });
}
}
// snare
if (token.type !== "punctuator") {
if (index % 8 === 4) {
sched.insert(t0, shot, { inst: 1, amp: 0.75, dur: 1 });
} else if (token.type === "keyword" || token.type === "identifier") {
const amp = Math.min(token.value.length / 32, 0.5);
const dur = token.type === "identifier" ? 0.25 : 0.5;
sched.insert(t0, shot, { inst: 1, amp: amp, dur: dur });
}
}
// hihat
if (token.type === "keyword" || token.type === "identifier") {
if (index % 4 === 2) {
const dur = token.type === "keyword" ? 0.75 : 0.5;
sched.insert(t0, shot, { inst: 2, amp: 0.325, dur: dur });
} else {
sched.insert(t0, shot, { inst: 2, amp: 0.25, dur: 0.1 });
}
} else if (token.type === "number" || token.type === "string") {
const amp = Math.min(token.value.length / 12, 0.5);
sched.insert(t0, shot, { inst: 2, amp: amp, dur: 1 });
} else {
const amp = wrapAt([ 0.125, 0.05, 0.1, 0.075 ], index);
sched.insert(t0, shot, { inst: 2, amp: amp, dur: 0.1 });
}
sched.insert(t0 + beat, compose, { index: e.args.index + 1 });
}
function compose(e) {
const t0 = e.playbackTime;
const token = tokens.shift();
if (token) {
const index = e.args.index;
// kick
if (index % 4 === 0) {
sched.insert(t0, shot, { inst: 0, amp: 0.4, dur: 1 });
} else {
if (/\d/.test(token)) {
const amp = /[02468]/.test(token) ? 0.25 : 0.125;
sched.insert(t0, shot, { inst: 0, amp: amp, dur: 0.25 });
}
}
// snare
if (/\w/.test(token.test)) {
if (index % 8 === 4) {
sched.insert(t0, shot, { inst: 1, amp: 0.75, dur: 1 });
} else if (/[A-Z]/.test(token)) {
const amp = 0.25;
const dur = /AEIOU/.test(token) ? 0.25 : 0.5;
sched.insert(t0, shot, { inst: 1, amp: amp, dur: dur });
}
}
// hihat
if (/\w/.test(token)) {
if (index % 4 === 2) {
const dur = /[a-zA-Z]/.test(token) ? 0.75 : 0.5;
sched.insert(t0, shot, { inst: 2, amp: 0.325, dur: dur });
} else {
sched.insert(t0, shot, { inst: 2, amp: 0.25, dur: 0.1 });
}
} else if (/\d/.test(token)) {
const amp = +token / 10;
sched.insert(t0, shot, { inst: 2, amp: amp, dur: 1 });
} else {
const amp = wrapAt([ 0.125, 0.05, 0.1, 0.075 ], index);
sched.insert(t0, shot, { inst: 2, amp: amp, dur: 0.1 });
}
sched.insert(t0 + beat, compose, { index: e.args.index + 1 });
}
}