🎉 start working on runtime aka. runner aka. interpreter

src/main.js

@@ -109,6 +109,13 @@ class Juicescript {
 		Run previously parsed program
 	*/
 	run(){
-		/**/this.io.stderr.debug(this.program_tree);
+		// RUN //
+		// get runner
+		let runner = new Juicescript_runner(this.program_tree, {
+			io: this.io
+		});
+		
+		// run the program
+		runner.run();
 	}
 }

src/runner.js

@@ -0,0 +1,67 @@
+class Juicescript_runner {
+	/*
+		CONSTRUCTOR: Return new juicescript runner for PROGRAM-TREE with OPTIONS
+	*/
+	constructor(program_tree, options){
+		// STORE ARGUMENTS //
+		// program tree
+		this.tree = program_tree;
+		
+		// io adapter
+		this.io = options.io;
+	}
+	
+	/*
+		MAIN: Do running
+	*/
+	run(){
+		/**/this.command = this.tree.root.command[0];
+		/**/this.debug(this.tree);
+	}
+	
+	/*
+		HELPER: Automagically keep track of problems and add additional info to stderr
+	*/
+	debug(text, additional){
+		// add defaults
+		additional ??= {};
+		additional.line ??= this.command.line;
+		
+		// forward
+		this.io.stderr.debug(text, additional);
+	}
+	info(text, additional){
+		// add defaults
+		additional ??= {};
+		additional.line ??= this.command.line;
+		
+		// forward
+		this.io.stderr.info(text, additional);
+	}
+	warning(text, additional){
+		// KEEP TRACK OF PROBLEM //
+		this.warning_count++;
+		
+		
+		// PRINT MESSAGE //
+		// add defaults
+		additional ??= {};
+		additional.line ??= this.command.line;
+		
+		// forward
+		this.io.stderr.warning(text, additional);
+	}
+	error(text, additional){
+		// KEEP TRACK OF PROBLEM //
+		this.error_count++;
+		
+		
+		// PRINT MESSAGE //
+		// add defaults
+		additional ??= {};
+		additional.line ??= this.command.line;
+		
+		// forward
+		this.io.stderr.error(text, additional);
+	}
+}