Some functions

src/API.ts

@@ -3,16 +3,121 @@ import { tryEvaluate } from "./Evaluator";
 // @ts-ignore
 import { ZZFX, zzfx } from "zzfx";
 
+class MidiConnection{
+    private midiAccess: MIDIAccess | null = null;
+    private midiOutputs: MIDIOutput[] = [];
+    private currentOutputIndex: number = 0;
+    private scheduledNotes: { [noteNumber: number]: number } = {}; // { noteNumber: timeoutId }
+  
+    constructor() {
+      this.initializeMidiAccess();
+    }
+  
+    private async initializeMidiAccess(): Promise<void> {
+      try {
+        this.midiAccess = await navigator.requestMIDIAccess();
+        this.midiOutputs = Array.from(this.midiAccess.outputs.values());
+        if (this.midiOutputs.length === 0) {
+          console.warn('No MIDI outputs available.');
+        }
+      } catch (error) {
+        console.error('Failed to initialize MIDI:', error);
+      }
+    }
+ 
+    public getCurrentMidiPort(): string | null {
+        if (this.midiOutputs.length > 0 && this.currentOutputIndex >= 0 && this.currentOutputIndex < this.midiOutputs.length) {
+            return this.midiOutputs[this.currentOutputIndex].name;
+        } else {
+            console.error('No MIDI output selected or available.');
+            return null;
+        }
+    }
+
+
+    public sendMidiClock(): void {
+      const output = this.midiOutputs[this.currentOutputIndex];
+      if (output) {
+        output.send([0xF8]); // Send a single MIDI clock message
+      } else {
+        console.error('MIDI output not available.');
+      }
+    }
+  
+    
+    public switchMidiOutput(outputName: string): boolean {
+      const index = this.midiOutputs.findIndex((output) => output.name === outputName);
+      if (index !== -1) {
+        this.currentOutputIndex = index;
+        return true;
+      } else {
+        console.error(`MIDI output "${outputName}" not found.`);
+        return false;
+      }
+    }
+  
+    public listMidiOutputs(): void {
+      console.log('Available MIDI Outputs:');
+      this.midiOutputs.forEach((output, index) => {
+        console.log(`${index + 1}. ${output.name}`);
+      });
+    }
+  
+    public sendMidiNote(noteNumber: number, velocity: number, durationMs: number): void {
+      const output = this.midiOutputs[this.currentOutputIndex];
+      if (output) {
+        const noteOnMessage = [0x90, noteNumber, velocity]; 
+        const noteOffMessage = [0x80, noteNumber, 0];
+  
+        // Send Note On
+        output.send(noteOnMessage);
+  
+        // Schedule Note Off
+        const timeoutId = setTimeout(() => {
+          output.send(noteOffMessage);
+          delete this.scheduledNotes[noteNumber];
+        }, durationMs);
+  
+        this.scheduledNotes[noteNumber] = timeoutId;
+      } else {
+        console.error('MIDI output not available.');
+      }
+    }
+  
+    public sendMidiControlChange(controlNumber: number, value: number): void {
+      const output = this.midiOutputs[this.currentOutputIndex];
+      if (output) {
+        output.send([0xB0, controlNumber, value]); // Control Change
+      } else {
+        console.error('MIDI output not available.');
+      }
+    }
+  
+    public panic(): void {
+      const output = this.midiOutputs[this.currentOutputIndex];
+      if (output) {
+        for (const noteNumber in this.scheduledNotes) {
+          const timeoutId = this.scheduledNotes[noteNumber];
+          clearTimeout(timeoutId);
+          output.send([0x80, parseInt(noteNumber), 0]); // Note Off
+        }
+        this.scheduledNotes = {};
+      } else {
+        console.error('MIDI output not available.');
+      }
+    }
+  }
+
 export class UserAPI {
 
     variables: { [key: string]: any } = {}
     globalGain: GainNode 
     audioNodes: AudioNode[] = []
+    MidiConnection: MidiConnection = new MidiConnection()
 
     constructor(public app: Editor) {
         this.globalGain = this.app.audioContext.createGain()
         // Give default parameters to the reverb
-
         this.globalGain.gain.value = 0.2;
         this.globalGain.connect(this.app.audioContext.destination)
     }
@@ -22,19 +127,99 @@ export class UserAPI {
         return node
     }
 
-    killAll() {
+    // =============================================================
+    // Utility functions
+    // =============================================================
+    log = console.log
+
+    public killAll():void {
         this.audioNodes.forEach(node => {
             node.disconnect()
         })
     }
 
-    var(name: string, value: any) {
+    // Web Audio Gain and Node Management
-        this.variables[name] = value
+    mute():void { 
+        this.globalGain.gain.value = 0 
     }
-    get(name: string) { return this.variables[name] }
+
+    volume(volume: number):void { 
+        this.globalGain.gain.value = volume 
+    }
+
+    vol = this.volume
+
+
+    // =============================================================
+    // MIDI related functions
+    // =============================================================
+
+    public midi_outputs(): void {
+        console.log(this.MidiConnection.listMidiOutputs())
+    }
+    
+    public midi_output(outputName: string): void {
+        if (!outputName) {
+            console.log(this.MidiConnection.getCurrentMidiPort())
+        } else {
+            this.MidiConnection.switchMidiOutput(outputName)
+        }
+    }
+
+    public midi_connect(outputName: string): void {
+        this.MidiConnection.switchMidiOutput(outputName)
+    }
+
+    public note(note: number, velocity: number, duration: number): void {
+        this.MidiConnection.sendMidiNote(
+            note, velocity, duration
+        )
+    }
+
+    public midi_clock(): void {
+        this.MidiConnection.sendMidiClock()
+    }
+
+    public cc(control: number, value: number): void {
+        this.MidiConnection.sendMidiControlChange(control, value)
+    }
+
+    public midi_panic(): void {
+        this.MidiConnection.panic()
+    }
+
+
+    // =============================================================
+    // Variable related functions
+    // =============================================================
+
+    public var(a: number | string, b?: number): number {
+        if (typeof a === 'string' && b === undefined) {
+            return this.variables[a]
+        } else {
+            this.variables[a] = b
+            return this.variables[a]
+        }
+    }
+    
+    public delVar(name: string): void {
+        delete this.variables[name]
+    }
+
+    public cleanVar(): void {
+        this.variables = {}
+    }
+
+    // =============================================================
+    // Small algorithmic functions
+    // =============================================================
     
     pick<T>(...array: T[]): T { return array[Math.floor(Math.random() * array.length)] }
 
+    seqbeat<T>(...array: T[]): T { return array[this.app.clock.time_position.beat % array.length] }
+    seqbar<T>(...array: T[]): T { return array[this.app.clock.time_position.bar % array.length] }
+    seqpulse<T>(...array: T[]): T { return array[this.app.clock.time_position.pulse % array.length] }
+    
     bpm(bpm: number) { this.app.clock.bpm = bpm }
 
     time_signature(numerator: number, denominator: number) {
@@ -66,10 +251,12 @@ export class UserAPI {
     beat(...beat: number[]): boolean {
         return (
             beat.includes(this.app.clock.time_position.beat) 
-            && this.app.clock.time_position.pulse == 1
+             && this.app.clock.time_position.pulse == 1
         )
     }
 
+    every(n: number): boolean { return this.i % n === 0 }
+
     pulse(...pulse: number[]) {
         return pulse.includes(this.app.clock.time_position.pulse) && this.app.clock.time_position.pulse == 1
     }
@@ -78,14 +265,6 @@ export class UserAPI {
         return this.app.clock.time_position.pulse % pulse === 0
     }
 
-    mute() {
-        this.globalGain.gain.value = 0
-    }
-
-    volume(volume: number) {
-        this.globalGain.gain.value = volume
-    }
-    vol = this.volume
 
 
     beep(